The shaft speed of an electric motor is most commonly expressed in units of...

The shaft speed of an electric motor is typically expressed in revolutions per minute (RPM). This measurement indicates the number of complete turns the motor's shaft makes in one minute, which is a standard way to quantify rotational speed in mechanical and electrical engineering. RPM is especially useful because it provides a clear representation of the motor’s performance and efficiency, allowing engineers and technicians to determine how quickly the motor can operate under various loads or conditions.

Using RPM helps in understanding and comparing the capabilities of different motors, as well as integrating them into systems where consistent rotational speeds are necessary for optimal operation. This unit is widely recognized and utilized across various applications, making it essential for anyone working with electric motors to understand.