Oriental Motor: Stepper Motors (PK Series)

Harmonic (HG) Geared Type Stepper Motor

The Harmonic Geared type stepper motor provides high accuracy positioning, high permissible/maximum torque and high resolution. Available in 50:1 and 100:1 gear ratios.

The harmonic gear is a pre-assembled stepper motor and gear which offers unparalleled precision in positioning and features a simple structure. Unlike conventional spur gears, the harmonic gear is capable of averaging the effects of tooth pitch errors and accumulated pitch errors to the rotational accuracy, thus achieving highly accurate, non-backlash performance.

The harmonic gear utilizes the metal’s electrodynamics property. It is comprised of three basic components, a wave generator, flex spline and circular spline.

Rotating the wave generator (input) clockwise while keeping the circular spline fixed in position will subject the flax spline to elastic deformation, causing a gradual shift in the point of engagement between the circular spline and flex spline.

When the wave generator completes one revolution, the flex spline has rotated two fewer teeth than the circular spline has, resulting in the movement of the flex spline for the difference in the tooth count (two teeth) in the opposite direction of the wave generator's rotation (i.e. counterclockwise). This movement translates into output, thereby reducing the speed.

Features:

Available frame sizes