Everything about Rotational Speed totally explained
Rotational speed (sometimes called speed of
revolution) indicates, for example, how fast a motor is running. Rotational speed is equivalent to
angular speed, but with different units. Rotational speed tells how many complete rotations (for example
revolutions or
cycles) there are per time unit. It is therefore a cyclic
frequency, measured in
hertz (
revolutions per second) in the
SI System. The units
revolutions per minute (rpm or 1/min) are more common in everyday life. Angular speed, however, tells the change in
angle per time unit, which is measured in
radians per second in the SI system. Since there are 2π radians per cycle, or 360 degrees per cycle, we can convert angular speed to rotational speed by:
» is angular speed (degrees per second)
For example, a stepper motor might turn exactly one complete revolution each second.
Its angular speed is 360
degrees per second (360°/s), or 2π
radians per second (2π rad/s), while the rotational speed is 60 rpm.
Rotational speed isn't to be confused with
tangential speed, despite some relation between the two concepts. Imagine a rotating merry-go-round. No matter how close or far you stand from the axis of rotation, your rotational speed will remain constant. However, your tangential speed doesn't remain constant. If you stand two meters from the axis of rotation, your tangential speed will be double the amount if you were standing only one meter from the axis of rotation.
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