Calculation of torque of a DC motor

AI Thread Summary
To calculate the torque of a DC motor, the correct specifications are crucial, particularly the RPM and power ratings. The motor in question operates at 400V, 50Hz, 6 poles, 200kW, and 1000 RPM, not 1400 RPM as initially stated. The torque can be derived using the relationship between power, RPM, and torque, which is commonly found in introductory physics resources. With the power at 200kW and the corrected RPM, the torque calculation can be completed. Accurate specifications are essential for selecting a suitable replacement motor.
fawaaz
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Hi everyone,

Im currently doing my final year project and I need to calculate the torque of a DC motor so that I can replace it accordingly by another motor. Here are the motor's specification : 400V, 50Hz, 6poles, 200kW, 1400rpm, 371A
Can anyone please help me sort this out.

regards,
Fawaaz
 
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I think the RPM (or number of poles) listed is incorrectk assuming specs above are for an induction motor.
A 6 pole motor at 50 Hz should give about 1000 rpm synchronous. With 1% slip, you should expect about 990 rpm.
50 Hz with 4 poles gives 1500 rpm synchronous. The motor would have to slip over 6% to make 1400 rpm.
 
Last edited:
oooh god... i made a mistake... itz 1000rpm... :(

now u can calculate the torque??
 
You know the power (200kw) and you know the rpm (1400). Open any first year physics book and look up the relationship between hp-rpm-torque.
 
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