Why does a motor have no torque at maximum speed?

[Jones1987]

When the motor is producing its top speed, and there is no torque, I cannot picture what this means. I understand that low speeds = high torques, as I can picture an object moving slowly because of its torque.

I undersrtand torque as the force that creates rotation, so if a shaft is rotating at its max speed, and it reads out no torque, why is this? Is this due to the momentum the shaft has therefore it no longer needs torque?

 

[batman394]

Think of torque like acceleration. One you hit top speed, you need very little acceleration to counteract drag/friction to maintain that top speed.

 

[jack action]

There is no torque at the shaft output, but there is still torque being produced. It is only all taken by internal friction and other losses.