Question

The efficiency of DC Motor is

Answer 1

Answer:

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Explanation:

70 to 85%

The value of the efficiency of a DC motor could typically be in the range of 70 to 85%. Larger the machine higher will be the efficiency. Losses consist of Armature and field copper losses, core loss, friction and windage loss.

Answer 2

Answer:

Efficiency of any machine (including DC motors) is defined as “Percentage of output power / input power”.

Formula for efficiency is: Efficiency = 100 * output power / input power

Higher the efficiency, better the motor. For ideal motor, the efficiency is 100%. Needless to say, efficiency can not be more than 100%.

For DC motor, output power in Watts is: angular speed (radians / sec) * torque (Nm). Input power in Watts is applied voltage * current.

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