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ohm single phase motor

I wanted to single equation regression models thank you and the single equation regression models TigerTek team for all your efforts this past week-end. The quick response and "round-the-clock" efforts were very much appreciated and proved yet again that TigerTek can be counted on in an emergency. Please extend my sincere appreciation to all involved. You guys do a Great Job!


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checking spindle motor windings
To check your spindle motor for bad windings, you can use several different methods. As always, make sure to disconnect all power from machine before doing anything. We highly recommend using a qualified, experienced vendor like TigerTek for your needs. Our repair specialists have years of experience, and consistently deliver industry-leading quality at very competitive prices, all backed by a comprehensive 12 month warranty. To experience the new single chip hall sensor for three phase brushless motor control TigerTek difference, give us a call at 1. or.

Testing for short to ground

Using Ohm meter: Disconnect all power from machine. Check all three wires singly T1,T2,T3 (all three phases) to the ground wire. Readings should be infinite. If its zero or reads any continuity at all, then a problem exists with either the motor or cable. If it is go directly to the motor and disconnect from cable and check motor and the cable separately. Be sure to make sure leads on both ends are not touching anything including the other leads. Most servo motor shorts can be read with a regular quality meter. Make sure you use quality meter going up to at least 10megohms. Using Megohm meter: Disconnect all power from machine. Check all three wires separately T1,T2,T3 (all three phases) to the ground wire. Readings are usually in a range from 600-2000 Megohms. Most shorts will be below 20 megohms. Be careful not to touch the leads or the wires to anything when taking the reading. It can give false and unrepeatable readings causing you to chase your tale. The above is what I found to be the average for 230VAC 3 phase motors. A rule of thumb that I've come across in other reference materials is about 1000 ohms of resistance for each volt of incoming power. Though 230meg for a 230VAC circuit seems on the low side from my experience. Only use this as single equation regression models a rule of thumb. Just beware that from 230meg to 600meg often shows some deterioration in the cables or motor insulation.

Testing for Open or short in windings

Using Ohm meter: Disconnect all power from machine. Put meter on ohms: T1 to T2 T2 to T3 T1 to T3 The range usually expected is.3 to 2.0 ohms, though most are about.8ohms. If you read zero, a short between phases exists. Usually if it is an open, it's infinite or well above 2K ohms. Cable and Plug Notes Often times, the connector on the cable to the motor will get coolant in it. Try drying it out and retesting. If it is still bad, the inserts themselves will sometimes get burn marks in them, causing a slight short. In this case, the inserts should be replaced. Also look for areas where the cable moves through tracking. Wires will wear through over time. If it's a DC Motor, check the brushes. There should be 3-4 round caps to remove around the motor. Under these you will find a spring with a square block (brush). See how much is left maybe need to replace. Also check the commutator that the brushes ride against for wear; try wiping the surface down.

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A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission linesamong other uses. High-power resistors that can dissipate many watts of electrical power as heat may be used as part of motor controls, in power distribution systems, or as test loads for generators.

Fixed resistors have resistances that only change slightly with temperature, time or operating voltage. Variable resistors can be used to adjust circuit elements such as a volume control or a lamp dimmeror as sensing devices for heat, light, humidity, force, or chemical activity. Resistors are common elements of electrical networks and electronic ohm single phase motor and are ubiquitous in electronic equipment. Practical resistors as discrete components can composed of various compounds and forms.

Resistors are also implemented within integrated circuits. The electrical function of a resistor is specified by its resistance: The ohm single phase motor value of the resistance falls within the manufacturing toleranceindicated on the component.

Two typical schematic diagram symbols are as follows:. One common scheme is the letter and digit code for resistance values following Ohm single phase motor For example, 8K2 as part marking codein a circuit diagram or in a bill of materials BOM indicates a resistor value of 8.

Additional zeros imply a tighter tolerance, for example 15M0 for three significant digits. When the value can be expressed without the need for a prefix that is, multiplicator 1an "R" is used instead of the decimal separator.

For example, 1R2 indicates 1. Practical resistors also have some inductance and capacitance which affect the relation between voltage and current in ohm single phase motor current circuits. An ohm is equivalent to a volt per ampere. The total resistance of resistors connected in series is the sum of their individual resistance values. Ohm single phase motor total resistance of resistors connected in parallel is the reciprocal of the sum of the reciprocals of the individual resistors.

A resistor network that is a combination of parallel and series connections can be broken up into smaller parts that are either one or the other. Some complex networks of resistors cannot be resolved in this manner, requiring more sophisticated circuit analysis.

At any instant, the power P watts consumed by a resistor of resistance R ohms is calculated as: Resistors are rated according to their maximum power dissipation. They usually absorb ohm single phase motor less than a ohm single phase motor of electrical power and require little ohm single phase motor to their power rating. Resistors required to dissipate substantial amounts of power, particularly used in power supplies, power conversion circuits, and power amplifiers, are generally referred to as power resistors ; this designation is loosely applied to resistors with power ratings of 1 watt or greater.

Power resistors are physically larger and may not use the preferred values, color codes, ohm single phase motor external packages described below. If the average power dissipated by a resistor is more than its power rating, damage to the resistor may occur, permanently altering its resistance; this is distinct from the reversible change in resistance due to its temperature coefficient when it warms.

Excessive power dissipation may raise ohm single phase motor temperature of the resistor to a point where it can burn the circuit board or adjacent components, or even cause a fire. There are flameproof resistors that fail open circuit before they overheat i can be flirten dangerously. Since poor air circulation, ohm single phase motor altitude, or high operating temperatures may occur, resistors may be specified with higher rated dissipation than is experienced in service.

All resistors have maximum voltage rating; this may limit the power dissipation for higher resistance values. Practical resistors have a series ohm single phase motor and a small parallel capacitance ; these specifications can be important in high-frequency applications.

In a low-noise amplifier or pre-ampohm single phase motor noise characteristics of a resistor may be an ohm single phase motor. The temperature coefficient of the resistance may also be of concern in some precision applications. The unwanted inductance, excess noise, and temperature coefficient are mainly dependent on the technology used in manufacturing the resistor.

They are not normally specified individually for a particular family of resistors manufactured using a particular technology. Practical resistors are also specified as having a maximum power rating which must exceed the anticipated power dissipation of that resistor a particular circuit: Resistors with higher power ratings are physically larger and may require heat sinks.

In a high-voltage circuit, attention must sometimes be paid to the rated maximum working voltage of the resistor.

Others have leads coming off their body "radially" instead. Other components may be SMT surface mount technologywhile high power resistors may have one of their leads designed into the heat sink. Carbon composition resistors CCR consist of a solid cylindrical resistive element with embedded wire leads or metal end caps which the lead wires are attached.

body of the resistor is protected with paint or plastic. Early 20th-century carbon composition resistors had uninsulated bodies; the lead wires were wrapped around the ends of the resistance element rod and soldered. The completed resistor was painted for color-coding of its value. The resistive element is made from a mixture of finely powdered carbon and an insulating material, usually ceramic.

A resin holds the mixture together. The resistance is determined by the ratio of the fill material the powdered ceramic to the carbon. Higher concentrations of carbon, which is a good conductor, result in lower resistance. Carbon composition resistors were commonly used in the s and earlier, but are not popular for general use now as other types have better specifications, such as tolerance, voltage dependence, and stress.

Carbon composition resistors change value when stressed with over-voltages. Moreover, if internal moisture content, single equation regression models from exposure for some length of time to a humid environment, is significant, soldering heat creates a non-reversible change in resistance value. Carbon composition resistors are still available, but comparatively quite costly.

Values ranged from fractions of an ohm to 22 megohms. Due to their high price, these resistors are no longer used in most applications. However, they are ohm single phase motor in power supplies and welding controls. A carbon pile resistor ohm single phase motor made of a stack of carbon disks compressed between two metal contact plates. Adjusting the clamping pressure changes the resistance between the plates.

These resistors are used when an adjustable load is required, for example in testing automotive batteries or radio transmitters. A carbon pile resistor can also be used as a speed control for small in household appliances sewing machines, hand-held mixers with ratings up to a few hundred watts.

A carbon film is deposited on an insulating substrate, and a helix is cut in it to create a long, narrow resistive path. Compared to carbon composition they feature low noise, because of the precise distribution of the pure graphite without binding. Resistances available range from 1 ohm to 10 megohm. It has to volts maximum working voltage range. Special carbon film resistors are used in ohm single phase motor requiring high pulse stability. Carbon composition resistors can be printed directly onto printed circuit board PCB substrates as part of the PCB manufacturing process.

A typical application would be non-critical pull-up resistors. Thick film resistors became popular during the s, and most SMD surface mount device resistors today are of this type. The resistive element of thick films is times thicker than thin films, [12] but the ohm single phase motor difference is how the film is applied to the cylinder axial resistors or the surface SMD resistors.

Thin film resistors are made by sputtering a method of vacuum deposition the resistive material onto an insulating substrate. The film is then etched in a similar manner to the old subtractive process for making printed circuit boards; that is, the surface is coated with a photo-sensitive materialthen covered by a pattern film, irradiated with ultraviolet light, and then the exposed photo-sensitive coating is developed, underlying thin film is etched away.

Thick film resistors are manufactured using screen and stencil printing processes. Because the time during which the sputtering is performed can be controlled, the thickness of the thin film can be accurately controlled. The type of material is also usually different consisting of one or more ceramic cermet conductors such as tantalum nitride TaNruthenium oxide RuO 2lead oxide PbObismuth ruthenate Bi 2 Ru 2 O 7nickel chromium NiCror bismuth iridate Bi 2 Ir 2 O 7.

The resistance of both thin and thick film resistors after manufacture is not highly accurate; they are usually trimmed to an accurate value by abrasive or laser trimming. They also have much lower noise levels, on the level of 10— times less than thick film resistors.

Thin film resistors are usually far more expensive than thick film resistors. For example, SMD thin film resistors, with 0. A common type of axial-leaded resistor today is the metal-film resistor. Metal film resistors are usually coated with nickel chromium NiCrbut might be coated with any of the cermet materials above for thin film resistors.

Unlike thin film resistors, the material ohm single phase motor be applied using different techniques than sputtering though this is one of the techniques. Also, unlike resistors, the resistance value is determined by cutting a helix through the coating rather than by etching.

This is similar to the way carbon resistors are made. The result is a reasonable tolerance 0. Also beneficial are their tight tolerance, low temperature coefficient and ohm single phase motor stability. They are used in applications with high endurance demands. Wirewound resistors are commonly made by winding a metal wire, usually nichromearound a ceramic, plastic, or fiberglass ohm single phase motor. The ends of the wire are soldered or welded to two caps or rings, ohm single phase motor to the ends of the core.

The assembly is protected with a layer of paint, molded plastic, or an enamel coating baked at high temperature. For higher power wirewound resistors, either a ceramic outer case or an aluminum outer case on top of an insulating layer is used — if the outer case is ceramic, such resistors are sometimes described as "cement" resistors, though they do not actually contain any traditional cement.

The aluminum-cased types are designed to be attached to a heat sink to dissipate the heat; the rated power is dependent on being used with a suitable heat sink, e.

Large wirewound resistors may be rated for 1, watts or more. Because wirewound resistors are coils they have more undesirable inductance than other types of resistor, although winding the wire in sections with alternately reversed direction can minimize inductance. Other techniques employ bifilar windingor a flat thin former to reduce cross-section area of the coil.

For the most demanding circuits, resistors with Ayrton-Perry winding are used. Applications of wirewound resistors are similar to those of composition resistors with the exception of the high frequency. The high frequency response of wirewound resistors is substantially worse than that of a composition resistor. The primary resistance element of a foil resistor is a special alloy foil several micrometers thick.

Electrical motor is the common used in industry all over the very important device to made production ensure the electrical motor condition is.

Your washing machine, ohm single phase motor electric dryer, your refrigerator, your generator -- all these appliances work by way of a motor. And in most cases the motor found in these devices is known as a single-phase motor.

While a single-phase motor is normally resilient and can operate unhindered for decades, there will come a time when it will break down and cause problems. However, before springing for a replacement, you may want to conduct some simple tests to see if the motor can still be repaired. This will save you a whole lot of time and money. Testing a single-phase motor will require some preparation.

For starters, you will to wear safety gear. A pair of safety glasses ohm single phase motor work gloves will do nicely, since dealing with a motor can accidentally send shocks to your body. And, since the voltage is considered high, it will be wise to take the necessary precautions.

The ohm single phase motor will be fastened securely by screws. Locate the two or four screws, depending on the motor model, and unscrew them with the slotted screwdriver. Lift the cover gently to expose the wire leads. There should be two wire leads for a single-phase motor. These wires will be connected to the power supply of the device or ohm single phase motor. While the wire leads exposed, check the voltage rating of the motor.

There should be a label indicating the voltage range. In order to effectively test the motor, you will be required to disconnect it from the power supply. Use a pair of pliers to detach both wires. Each wire should have a plastic end going to the power supply. Simply pull it out. This step will require a volt-ohm tester. Your tester will have two wires with lead tips. Read the results on the tester, then repeat the same procedure with the other exposed wire lead. both tests result in 0 ohms, the motor does not have any problems and can still be used.

On the other hand, if the results indicate a charge, it could mean that there is a short or that the motor has broken down due to worn-out bearings or extreme heat.

Unlike three-phase motors, a single-phase motor uses a capacitor to function. If the lead tests resulted in normal readings, the next step will be to test the capacitor. Locate the capacitor and remove it.

It is important that you wear gloves at this point, as the capacitor is charged with high voltage, which will automatically discharge should ohm single phase motor accidentally touch its lead parts.

At this point, switch your tester to read volts. Place one tip on one of the two leads. The other tip goes on the other lead. If the voltage reading is above 0, the capacitor is ohm single phase motor charged and there is nothing wrong with it. However, if it reads 0, then the capacitor has died out and needs replacement. Step 1 Testing a ohm single phase motor motor will require some preparation. Step 3 Disconnect the wires. Step 4 Test the lead. Step 5 Test the capacitor.

How to check the windings of a refrigeration compressor

Some more links:
Most problems with single-phase motors involve the centrifugal switch, thermal switch, or capacitor(s). If the problem is in the centrifugal switch, thermal switch.
The behaviour of an ideal resistor is dictated by the relationship specified by Ohm's law: = ⋅. Ohm's law states that the voltage (V) across a resistor is.
A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can.
A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can.
important - read before downloading, copying, installing, or using. do not download, copy, install, or use this content until you (the "licensee") have carefully read.

What is the allowed tolerance for winding resistance as per standard?

I m very thankfull to u single equation regression models bcoz it is very clear concept. Today my all doubts are clear abt motor connection.

it help me a lot

Excellent article and photos

  • At 11 February 2016, 2:55:18 user rizuan wrote:

thanks bro

thank you for your help

Excellent work. Very helpful.

  • At 30 December 2015, 5:16:05 user Shahin wrote:

Very good

Thank u very much.

  • At 28 November 2015, 2:41:10 user Thein wrote:

it is helpful.thanks

It was written so well, in clear and simple language, without leading to any confusion. Really good.

its really such a good thing which i did not know before. Thanks

motor details

5 HP MOTOR resistance value how much

very useful

Hi. We have a Myers Submersible water pump model 3ST52-5-P4 that doesn't work. My husband cut the wires and took some resistance readings. It has 4 wires. There was no reading between any of the wires and the green one which he assumes is the ground. The reading between the black and red = 22 ohms, red and yellow = 20 ohms, black and yellow = 4.7 ohms. Do these reading point to a problem with the motor.

Thank you

I love this explanation and it gives boldness to my career

Very good explaination, anybody can understand easily immediately:-

what is the DG power to solor power in generator ple..

Thans you

Excellent article and photos

easy way to known the connection of induction motor.

Thank you, its very easy to get the basic knowledge.

good page

1 phase:220 v
2 phase:440 v
why 3 phase is not equale to 660 v.its resion?

Thanks alot very helpful tips in my work.God bless more tips

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  • At 17 January 2015, 13:57:19 user Ganesh wrote:

If you give how to identify starting end and finishing end in a coil it is more useful. Just try to give that information

  • At 8 January 2015, 22:14:26 user danny wrote:

nice informative scripts


  • At 28 November 2014, 19:48:12 user Guest wrote:

Brief and thorough. Just a great piece of technical writing!

Beautifully written and illustrated article. It would be good if material could be added about the result of not having one phase in both the Y and delta configurations.

Aside: it's = it is.

  • At 11 November 2014, 15:45:58 user SAHIL wrote:


You cleared all my doubts. Thanks

  • At 10 November 2014, 16:27:30 user kishore wrote:

This is really soo good.. this is usefull

Do you have same information for 12 lead 3 phase motor? thank you

  • At 20 October 2014, 18:05:29 user sahil wrote:

undoubtly good article

This article is very good

good content

I was doing my trade test, motor test task. I found out my windis are not da same while doing continuity test with my meter. Now I had to balance the windings, I had 21.3 on U and 10 on V but infinity (OL) on W windimg. I could not calculate my percentage difference becouse onfinity is too big it has mo value. My qiestion what was I surpose to do?? I knw da formula to calculate percentage difference its=

Percentage diffence = Resistance high-Resistance low all/ divoded by resistance high tymes 100%. Whts infinity value?? Or my amswer

Thanks. Concise and easy to understand, although not what I was looking for.

A very clear laid out explanation, been a electrician mate i have no understanding of motors, we had a fault the other day on a motor, & i wondered how they would test it, Well now i do, now i even no about STAR DELTA.

Nice one

  • At 9 September 2014, 6:42:07 user SS SHAH wrote:

How do we know standard resistance/inductance value of 3-phase induction value for different capacity and speed of individual motor?

  • At 8 September 2014, 19:20:55 user monu wrote:

How do we know the terminal a1a2 b1b2 c1c2 if there are not marked A B C 1 2 3? I hope you understand my question that there is no identification of A1A2 B1B2 C1C2 SO HOW DO WE UNDERSTAND THAT A1A2 B1B2 C1C2

you have explained this very have done a big task.thank u.

how can instol the winding motor

How do we know the terminal a1a2 b1b2 c1c2 if there are not marked A B C 1 2 3? I hope you understand my question that there is no identification of A1A2 B1B2 C1C2 SO HOW DO WE UNDERSTAND THAT A1A2 B1B2 C1C2

I want a motor winding checking list by ohm and any checking method because I was a face a last time problem I am checked the motor proper by continuity all ok so start the motor and its blast and I am face manny problem because I done the maximum work 5kw to 200 kw.

in a single phase oil circulating motor,i test in my section continuously 4 hours.there were no probelem.rating of the motor is 7.5Amp,230V,but when it connect in motorcoach (inCOMPLETE OIL CIRCUIT) sometimes it appears taking high current,motor was not running,abnormal sound etc.what is the reason? please tell me.

I have a twin speed 3 phase motor high/low speed,at some point terminal block has been taken away.How can i find the high and low speed windings.??Thanks

A 3 phase motor for a washer with the following details:
type A12H4d-23
Y = 190v 3phase 50hz speed:1455 RPM Curent:7.5A P2:1.5Kw
IP:20 I.C:F part number 438970561

The machine is indicating Error motor too hot after running for 4minutes.The winding resistance is 1.4ohms across the phases in star(uniform values).When running,one the current results obtained are::
L1=2.5Amps L2=1.6amps L3=2.5Amps while phase to phase voltage=62.15volts and phase to neutral= 135volts(in low speed).The motor is supplied from a motor control unit which takes in single phase(220v) and delivers three phase to the motor.

Please help.

thank u @ zithu

  • At 31 May 2014, 13:01:04 user chris wrote:

Ohmmeter can not detect a partially shorted windings specially when you're dealing with a larger motors. The best equipment to use is the microhmeter. And also you can use LCR to measure the inductances of each winding. May I request you to give a procedure in measuring the inductances using the LCR.

Thank you

Very easily you explained it, very nice


it's useful for Je

Great info- very informative. Thanks!

  • At 23 January 2014, 21:14:27 user Mike wrote:

Great Site!

Relly, very useful to my knowlage.

  • At 31 December 2013, 21:08:43 user Skip wrote:


Simply put your explanation of star and delta connections is probably the best one I have come across!
Keep up the good work, you have a rare quality you must use to its max!

@Asokarasan Once i had a motor from a coil repair and the guy had this mistake as you mention it. It stalls and makes noise.

if A-A1,B-B1,C-C1 is coil sequence in delta connection,if we change A1-A, B-B1,C-C1 what will happen motor

really interested in your lecture on resistance measurement. is highly knowledge to me.

I really loved your lecture on resistance measurement. is highly facilitating.

i'm like this circuit connection. Any more impede send mail

Dear Sir,
I would like to know the connection (star star/star) two speed three phase squirel cage motor also the connection (star/-star) that i saw those connection in ASIA type motors and supporting your answering by drawings(line voltage is 380vac)thankyou

i like him

@Daramola Dele It depends on the power and type of the motor. It may have less than 1 ohm resistance or much higher.

I really loved your lecture on resistance measurement. is highly facilitating.
however, what is the minimum acceptable resistance and insulation resistance for a motor?

@Shawn Hall Always talking about Y connection, between common and any terminal is the lowest resistance, between two terminals is the highest.

Thanks alot you just open my a new chapter to my knowledge.

When testing the windings od a single phase motor,
Technician #1 says that the common and the run terminals show the lowest resistance.
Technition #2 says that the pair of terminals with the highest resistance will indicate that the other terminal is the common.
Who is correct?
A. Technician #1 only.
B. Technitian #2 only.
C. Both technicions #1 and #2.
D. Neither technicions #1 or #2.

I think the answer is D?

@Robert Chadwick 3-phase AC induction motor Star connection? Then it is dead.

I have a 3 phase motor, and I am able to the 3 leads that go into the motor I get no resistance between 2 of the leads, and 33 OHMS from either one of those to the third lead. what does that mean

@samantha @samantha. if we change the connection RPM will not change. this 2 connections related for voltage & current only. if the connection is star current will low sameas voltage should be costant 415v. delta current will high but motor will start at littlebit low voltage also. RPM related only NO OF POLES and Effeciency of motor

I had a 3 phase ac motor i want to to connect to power supply and the control was starting by star then delta (6 leads) my problem is the si lead came from motor has no marking for the 1,2,3,4,5,6 i cant determine the 1,2,3 and the 4,5,6.please help me

Will a fifty hz 415.37kw work on 480 60hz.....?????,I

@kazi sahriar U1-V1-W1 goes to RST. U2-V2-W2 shorted all together for star connection.

dear sir,
my problem is, I have a 3 phase motor which r 6 probe those r U1 V1 W1 & U2 V2,how i can connect those terminal.Plzz tell me sir.

I want know if there is any type of book or software showing me all the connection daigrams of the motor. For example like 2star 2delta 3star 3delta 4star 4delta for different rpm and poles

  • At 16 April 2013, 16:38:23 user Idriss wrote:

That is a very clear explanation. I have read so many topics on this, but this is the first time I actually get it.


IN the Motor Winding end wire in 3 phase A1A2, B1B2, C1C2 connected thro RYB the motor will run But if any changes in the terminal connection

A2A1 / B2B1 / C2C1 if the motor winding will get Abnormal heat.

Further, pleas give the diagram for the How to identify the A1, A2 B1, B2,C1,C2 by using TEST LAMP METHOD

Thanks for the info above. Its help me a lot.

sir many regards

kindly send me any post notification as to be more informative and conscious about my related field.
thanx a lot

@Vasilis Caravitis This is the worst case scenario... Star-Delta switches though have schematics how to connect them. You have to consult this schematic. There are 6 connectors, RST and UVW. You connect the first row of motor connectors to R-S-T and the second row to U-V-W

Hi, My problem is that I need to replace the Star-Delta change-over switch. The existing 5-position (broken) switch allows also reverse rotation, but I only need one direction of rotation. The rplacement is intended for single direction operation and has a different terminal pattern. How can I determine which cable goes where?

@Decker auto electric This motor must be connected in star probably (i may be mistaken though). Connect the 3 poles on one side all together, and then apply RST to the other 3 opposite poles

I got this electric motor that i can not
Figure out how to connect the internal
Wires coming out of the motor..
Could anybody help me on it???

24 slot. 2 pole lapwinding 2 coils per group
6 groups. 295 rounds per coil. Pitch 1 to 11

440/220 volts 3 ph 3200 rpm
There are only 6 leads coming out of motor
But just can't get the motor running
Thank a lot

  • At 16 February 2013, 16:33:43 user kevin wrote:

Hi does anyone have any ideas about wiring a six wire motor to use on a rotary phase converter because ive tried a few different ways but im getting nowhere, any help is appreciated.

@samantha none, both will give you the same rpm. Delta will give you (if motor permits) more torque.

pls tel me which connection is giving more RPM? (star or delta)

@Abbas musa there is no formula. It depends on the wire thickness and length.

  • At 2 January 2013, 2:28:13 user geoff wrote:

Well presented explanation. This is a good site for electrical mechanics.

helo... Am 4rm Nigeria.please, what is the formula used for calculating the winding resistance of a.c asynchronous motor using the volt-ampere method?

Six wires are not a problem. I have a motor that I looked at today that had 9 wires, and two ways to set up. The first is high voltage and the other is low voltage. What is the correct way to check the motor for proper connection?

  • At 13 December 2012, 15:46:52 user KHALID wrote:


Dear Sir,
I would like to know the connection (star star/star) two speed three phase squirel cage motor also the connection (star/-star) that i saw those connection in ASIA type motors and supporting your answering by drawings(line voltage is 380vac)thankyou

I like very much improve knoldge my self

it'S EASY TO UNDERSTAND............

This is good and clear

@atish kumar read 'Checking the coils of an unconnected motor"

I have the same doubt that..
How would you go about testing the start & end of each motor winding prior to powering up the motor, either by the use of a multimeter or a battery and a volt meter. I understand that one could power up the motor and check the current being pulled by each phase, if there is a serios unbalance on a single winding, then turn that winding around, BUT I would like clarity on how to sort out the windings start and end before power up.

  • At 24 September 2012, 14:30:09 user ganesh wrote:

may be ur ohm meter problem.

i like this web site

@marcus usually 3-phase motors with 3 wires are internally Y or delta connected. It must be on the plate.

  • At 24 August 2012, 5:23:58 user marcus wrote:

and if your three phase motor only has three wires not six - what way do you test it then?

Today i got different problem what actually happen one motor got tripped continually so i checked the motor amps its high 12A so i checked the name plate there full load current 12A so that i removed the load and checked after that also same current 12A how it's i confused because with load 12A without load also 12 A so that i checked the winding resistance that is ok 3phase equally, after that i checked bearing that also good winding also good then how this it's happen anybody knows kindly reply me

(Portugal) Great tutorial. I am 51 years old, I am self taught. I'm unemployed. I like learning things of quality. I like to diversify knowledge. It will not let me grow old. Thank you. Gavina.

@Ian Ellis there are 6 connectors on a 3-phase squirrel cage motor. You can test them with multimeter, ohm-meter or battery by following the instruction if the first page of this theory, at the bottom (Checking the coils of an unconnected motor)

How would you go about testing the start & end of each motor winding prior to powering up the motor, either by the use of a multimeter or a battery and a volt meter. I understand that one could power up the motor and check the current being pulled by each phase, if there is a serios unbalance on a single winding, then turn that winding around, BUT I would like clarity on how to sort out the windings start and end before power up.

@George excellent! I am working on a simple coil checker tool (that is why i uploaded this theory after all). I will check this link and see if i can add it as a function. ;) thanks.

  • At 5 January 2012, 23:42:46 user George wrote:

one other thing.

NEVER WORK ON AC system by yourself, ALWAYS have another person there as the SAFETY person. To switch off the power, and/or save your butt/ life if anything goes seriously wrong

  • At 5 January 2012, 23:39:19 user George wrote:

@Paul - there are two methods for checking phase of windings mentioned on

One uses a push button DC voltage and a galvanometer.

The other uses live AC voltage on 1 winding against the other 2 windings connected in series to see if there is a net 0V AC or double the test winding Voltage, BUT beware YOU ARE WORKING WITH LIVE AC POWER. So make sure that you have tested for earth faults. [A multimeter is not really the greatest here a megger would be better] AND DO NOT TOUCH ANYTHING WHEN LIVE - use INSULATED PROBES

@Paul :D :D i'll tell you a little secret. The motor that is the photos, is a repaired motor that had a burned coil. The (not so good) technician that repaired the coils connected one of them the opposite direction. I tried hard to find a way to measure that problem, but had no luck with simple instruments. You connect it in the supply and if it makes noise and does not rotate, or rotate with no torque, then change connection...

  • At 5 January 2012, 16:03:36 user Paul wrote:

Just wonderin...

Some time ago I also had to figure out how to connect a 1.5KW three phase motor but on this motor there was not such a nice board for connecting the wires. It basically had 6 loose wires dangling from it.

A big problem would be if one of the phases is connected backwards relative to the other 2.

How do you check for that?
In the end I just (sort of) guessed, but I took some extra precautions to prevent destroying a perfectly good motor.
I guessed right but didn't feel happy about it.

Zahra Doe Morbi gravida, sem non egestas ullamcorper, tellus ante laoreet nisl, id iaculis urna eros vel turpis curabitur.


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Zahra Doejune 2, 2017
Morbi gravida, sem non egestas ullamcorper, tellus ante laoreet nisl, id iaculis urna eros vel turpis curabitur.
Zahra Doejune 2, 2017
Morbi gravida, sem non egestas ullamcorper, tellus ante laoreet nisl, id iaculis urna eros vel turpis curabitur.

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