Motor Speed and Torque Flashcard

Front

What happens to a motor's speed when it is loaded with no torque?

Back

It runs at no-load speed

Front

The relationship between speed and torque in a motor is:

Back

Linear

Front

When does a motor produce zero power?

Back

When either torque or speed is zero

Front

Maximum power in a motor occurs at: Three-quarters of stall torque

Back

Three-quarters of stall torque

Front

In the formula P = τ · ω, what does ω represent?

Back

Angular speed

Front

The stall torque in the example problem was:

Back

4.2 lb·in

Front

To improve motor efficiency in the example, what gear ratio was used?

Back

1:2

Front

The torque at maximum power is:

Back

Half the stall torque

Front

In the winch example, the output torque was:

Back

2.0 lb·in

Front

What is no-load current in an electric motor?

Back

The current drawn when the motor has no mechanical load.