Question

You purchase a motor in Germany designed to run at 415 Volts, 50 Hz. It has 75 kW output power, runs at 2978 RPM and has 240 N-m of rated torque. You ship it Canada and run it at 480 Volts, 60 Hz. What will be the new torque in N-m

Answer 1

Answer:

230N-m

Explanation:

Given data

Power P= 75kW

Frequency f= 60Hz

w= 2πf

w=2*π*60

w=120π rad/s

Power= T*w

Power= IV= 415*I

75*10^3= 415*I

I=180.72 A

V= 480V

Power= 180.72*480

Power= 86.746kW

Power= 86.746= T*120π

T= 120π/86.746

T= 230N-m