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Monday, July 23, 2007

Hybrid Stepper Motor basics

The hybrid stepper motor consists of two pieces of soft iron, as well as an axially magnetized, round rotor. The term hybrid is derived from the fact that the motor is operated under the combined principles of the permanent magnet and variable-reluctance stepper motors.

The stator core structure of a hybrid motor is essentially the same as its VR counterpart. The main difference is that in the VR motor, only one of the two coils of one phase is wound on one pole, while a typical hybrid motor will have coils of two different phases wound on the same pole. The two coils at a pole are wound in a configuration known as a bifilar connection.

The teeth on the rotor provide an even better path which helps guide the magnetic flux to preferred locations in the air gap.

This type provides better performance with respect to step resolution, torque and speed. The hybrid stepper motor combines the best features of both the PM and VR type stepper motors. These facts further increase the detent, holding and dynamic torque characteristics of the motor when compared with both the VR and PM types.

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