A motor’s power output is a key consideration when sourcing an electric motor for any type of application. Power output can be a complex thing to consider, however, as it is determined by many factors, most notably the motor’s speed and torque. To understand a motor’s fit for your application, it is important to first know the differences between speed and torque and the impact each has on the power output of a motor.
The Basics of Speed and Torque
In order to fully understand the concepts of speed and torque, we must begin by defining each term:
- Speed: The speed of a motor, at its most basic form, is the rate at which the motor spins. The speed of an electric motor is measured in rotations per minute, or RPM.
- Torque: The torque output of a motor, at its most basic form, is the amount of rotating force the motor develops. The torque of an electric motor is measured in pounds per force inch or lb-in.
The two factors largely determine the power output of an electric motor. Power can be determined by the following equation: Power (P) = Speed (w) x Torque (T).