Revolutions per minute (RPM or revs/min) is a measure of motor’s rotational frequency. Let’s say a motor’s fan speed is 5 RPM, its shaft would be making 5 complete rotations in a minute, around its axis of rotation. The more the number of RPMs of a motor, the more would be the speed of the motor.
“Revolutions per minute(abbreviated rpm, RPM, r/min, or r·min−1) is a measure of the frequency of a rotation. It annotates the number of full rotations completed in one minute around a fixed axis. It is used as a measure of rotational speed of a mechanical component.
Standards organizations generally recommend the symbol r/min, which is more consistent with the general use of unit symbols. This is not enforced as an international standard”
- On many kinds of disc recording media, the rotational speed of the medium under the read head is a standard given in rpm.Gramophone (phonograph) records, for example, typically rotate steadily at162⁄3,331⁄3, 45 or 78 rpm (5⁄18,5⁄9,3⁄4, or 1.3Hz respectively).
- Modern ultrasonic dental drills can rotate at up to 800,000 rpm (13.3kHz).
- A washing machine‘s drum may rotate at 500 to 2000 rpm (8–33Hz) during the spin cycles.”