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How to create pole in electric motor for speed variation?

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Question ajoutée par Abu Hanif Md.ripon Ripon , Maintenance Inspector. , Heidelberg Cement Bangladesh Ltd.
Date de publication: 2015/04/17
thiagarajan reddy
par thiagarajan reddy , shift electrical engineer , chemplast sanmar ltd

WHEN THE MOTOR IS GOING FOR REWINDING ,AT THAT TIME ONLY THE POLES CAN BE CHANGED TO OUR REQUIREMENT.

THIAGARAJAN.E

Gerasimos Athanasiadis
par Gerasimos Athanasiadis , Technical Manager , Intacom Defense

The speed of a motor is a linear function of the [voltage applied on it's windings minus the (windings resistance multiplied by the current)] So you can vary the speed by varying the voltage. If you want a precise speed control, then you would need a feedback signal. You can use a tacho-meter which will give you a voltage output proportional to the motors speed. You can build a circuit which reads the tacho's voltage and varies the motor's windings voltage accordingly.

In general if you supply the DC motor with a PWM voltage, then the PWM's duty cycle would be proportional to the motors speed.

SANTOSH KUMAR NANDA
par SANTOSH KUMAR NANDA , Assistant manager , BMM ISPAT LTD

No one can create or add pole in existing motor. It is a designer part,provided as per speed required.

Hazem Waddah
par Hazem Waddah , Senior Cyber Security Engineer , New Giza University

Well, Actually you can't add poles or decrease any ones since, each motor is already designed and constructed with that number. you can know which speed you can use depending on what you find on motor plate, as follows:

3000 rpm

1500 rpm

750 rpm

This means3000 rpm is corresponding to2 poles,1500 rpm is corresponding to4 poles.

because, the speed depends linearly & Reversely on number of poles, this means when number of poles increases to double, the speed decreases to half the speed. 

waqas usman
par waqas usman , Electrical Supervisor , SITARA CHMICAL POWER PLANT (CFPP 40 MW)

Speed of the motor depend on pole if pole incress then speed will slow and if pole decress then speed will fast

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