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What is the methods used to increase motor speed?

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تم إضافة السؤال من قبل Hasan Ahmad Ali Mohammad , Production Engineer , Gulf Grilles Company
تاريخ النشر: 2016/06/19
Padam Sharma
من قبل Padam Sharma , Sales Manager , SIEMENS Ltd

Either though VFD or by changing pole of motor

Ahmed Tawfik
من قبل Ahmed Tawfik , Rig Electrician , Sino Tharwa Drilling Company

Speed of a motor can be increased by

 1 - increasing the frequency of the power supply

 2- decreasing number of poles 

Kingsford Koski Yalley
من قبل Kingsford Koski Yalley , Electrical Maintenance Engineer , Qatar Airways

Speed of a motor can be increased by increasing the frequency of the power supply as Ns = 60F/P. This equation means that, Synchronous speed (Ns) which is the speed of the rotating magnetic field is proportional to supply frequency (F) and inversily proportional to per pole (P) of the motor.

jamaleddine EL BOUKHARI
من قبل jamaleddine EL BOUKHARI , توزيع الماء و الكهرباء , ريضال

Star-delta start, and variable speed drive

AK PAN
من قبل AK PAN , General Manager Engineering and Commissioning , Danieli Automation

Speed of a DC Motor can be increased by increasing Armeture Voltage or reducing Field current.

 

Speed of an AC Motor can be increased by either by V/f upto base speed, or by increasing frequency beyond base speed.

Syed Khizar Abbas Rizvi Rizvi
من قبل Syed Khizar Abbas Rizvi Rizvi , E&I Commissioning Engineer , Pakistan Atomic Energy Commission

practically speaking only by driving the motor through a VFD. no of poles cannot be changed in a running motor nor the rated voltage can be increased to a maximum defined level ( as per nameplate information)

shehab elbata
من قبل shehab elbata , Senior Control Systems Engineer , Torque Automation

Frequency is directly related to the motor’s speed that the faster the frequency, the faster the rotation speed and vice versa sa

Muhammad Umar
من قبل Muhammad Umar , Engineer , Crown Paper Mill

VFDs can be used to increase and decrease the speed.

VFDs vary the voltage or frequency to increase or decrease speed according to this formula N=(120*f)/Poles.

 

Muhammad Usman
من قبل Muhammad Usman , Assistant Manager Operations , Lahore Electric Supply Company

The speed of AC motor is given by:

N=(120*f)/Poles

So, speed of motor can be increased by

1) Increasing the frequency

2) Decreasing the no. of poles.

Also,

3) Increasing the line voltage.

4) By decreasing the rotor resistance in case of wound rotor machine. 

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