The efficiency of the DC motor at maximum power is
The efficiency of the DC motor at maximum power is
Right Answer is:
Less than 50%
SOLUTION
Why efficiency of D.C motor is below 50%
The DC motor develops maximum power when the Back EMF is half the applied voltage is Eb = V/2.
- Practically it is not possible to develop an exact 50% of maximum power because in that case, the current would be much beyond the rated current of the motor.
- Some of the energy is wasted in the form of heat and other losses. Therefore motor efficiency is below 50%.