Magnetically enhanced stepping motor

Details Magnetically enhanced stepping motor Magnetically enhanced stepping motor

1987-07-10

1988-08-09

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 49R, 310154, 310156, H02K 2100

Patent

active

047630345

ABSTRACT:
The electric motor includes a mover, which may be a rotor or actuator, and a stator having a number of poles projecting toward the mover. The poles have soft-magnetic teeth projecting toward the mover and extending transverse to the direction of mover movement, and the mover has soft-magnetic teeth projecting toward the stator teeth and extending transverse to the direction of mover movement. Windings energize the stator to move the mover. Dividing each pole transverse to the direction of mover movement to define two pole portions per pole, and locating permanent magnetic material between stator teeth in only one portion of each of the poles, enhances the motor torque while achieving a saving of permanent magnetic material. Preferably the magnetic material exists on alternate pole portions in successive poles.

REFERENCES:
patent: 3757150 (1973-09-01), Benezech
patent: 4564778 (1986-01-01), Yoshida
"Higher Torque From Hybrid Stepper Motors", 903 Machine Design, 57 (1985) Apr., pp. 23-25 and 28-29.

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