Question

electric motor draws 20A at 50V. if its
efficiency
is 30%,
find the resistance of
winding of
motos​

Answer 1

Answer:E = Pout / Pin

therefore

Pout = Pin * E

after substitution we get

τ * ω = I * V * E

τ * rpm * 2π / 60 = I * V * E

and the formula for calculating torque will be

τ = (I * V * E *60) / (rpm * 2π)

Explanation:

Electrical motor efficiency is the ratio between shaft output power - and electrical input power.. Electrical Motor Efficiency when Shaft Output is measured in Watt. If power output is measured in Watt (W) then efficiency can be expressed as. η m = P out / P in (1). where. η m = motor efficiency. P out = shaft power out (Watt, W). P in = electric power in to the motor (Watt, W).