Composite magnet stepper motor

Details Composite magnet stepper motor Composite magnet stepper motor

1993-06-07

1994-11-29

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310192, H02K 3714, H02K 122

Patent

active

053693230

ABSTRACT:
A stepper motor is provided that is compact, easily manufactured, and provides high torque. The stepper motor comprises a multi-pole composite magnet which functions as a rotor, at least one stator member which determines the angular position of this rotor, and means for positioning the rotor and the stator members on a common axis. The composite magnet comprises two pieces, each piece having a mating member and an arc-shaped member integrally formed with the mating member. To form the composite magnet, the mating members of both pieces are aligned on an axis and the arc-shaped members of both pieces are juxtaposed. The first and second pieces are magnetized in opposite axial directions which results in two advantages. First, the composite magnet provides a high area of energy conversion per unit volume, thereby significantly reducing the size of the stepper motor in comparison to prior art stepper motors. Second, because the projections and apertures are magnetized in opposite axial directions, the magnetic poles are extremely well-defined thereby ensuring that the composite magnet provides both accuracy and high torque capability.

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