Calculation of torque of a DC motor

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SUMMARY

The discussion focuses on calculating the torque of a DC motor with specifications of 400V, 50Hz, 6 poles, 200kW, and 1400rpm. It is clarified that the motor is likely an induction motor, where a 6-pole configuration at 50Hz typically results in a synchronous speed of 1000rpm. The correct formula for torque calculation involves using the known power (200kW) and the corrected RPM (1000rpm) to derive the torque value, which can be referenced in introductory physics literature.

PREREQUISITES
  • Understanding of DC motor specifications and operation
  • Knowledge of synchronous speed calculations for induction motors
  • Familiarity with torque, power, and RPM relationships
  • Basic physics principles related to rotational mechanics
NEXT STEPS
  • Research the formula for calculating torque: Torque = (Power × 60) / (2π × RPM)
  • Explore the differences between DC motors and induction motors
  • Learn about motor slip and its impact on RPM
  • Investigate motor replacement criteria based on torque and power ratings
USEFUL FOR

Engineering students, electrical engineers, and anyone involved in motor selection and performance analysis will benefit from this discussion.

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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