A motor has a measured noload speed of 11500 rpm and a measu

A motor has a measured no-load speed of 11,500 rpm, and a measured stall torque of 4.47 mNm. What is the expected speed of this motor when delivering 1.5 mNm of torque into an external load? A motor has R = 14.5 Ohm, a no-load speed of 11,500 rpm. and no-load current of 12 mA when operated at 9 V. What is the maximum efficiency when operated on 9 V?

Solution

Given details:

N₁=11500 rpm

T₁= 4.47 mNm

T₂= 1.5 mNm

N₂=(N₁*T₁)/T₂

N₂ =34270 rpm.