A motor running at its rated power provides 2.6 lb-ft torque at its rated speed of 2020 rpm. The motor draws 5.6-A from a 230-V supply at a phase angle of 37 degrees. Determine the following: The horsepower delivered by the motor, The efficiency of the motor.

Answer 1

Get the motor electrical input power Pin (in Watts)from the product of current, voltage and the cosine of the phase angle.

Get the delivered power Pout (in Watts) from the product of torque and angular velocity. Make sure the torque is in Newton meters and the angular velocity is in radians/sec

The motor efficiency is Pout/Pin