Permanent magnet stepping motor

Details Permanent magnet stepping motor Permanent magnet stepping motor

2007-02-27

2007-02-27

Lam, Thanh (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

10831193

ABSTRACT:
A permanent magnet (PM) stepping motor includes a rotor structure and a stator. The rotor structure includes an axis, multipolar yoke stacks, and at least one spacer. Each of multipolar yoke stacks includes an N multipolar yoke, a permanent magnet and an S multipolar yoke combined as a hamburger-like structure, and each N pole of the N multipolar yoke and each S pole of the S multipolar yoke are alternately aligned. One of the spacer is sandwiched between each pair of the multipolar yoke stacks. The stator circumnavigates the axis and the multipolar yoke stacks, and provides a magnetic field for the multipolar yoke stacks to make the axis rotating. This PM stepping motor has the advantage of a minimized magnetic pole pitch and a high torque, which cannot be achieved in conventional stepping motors.

REFERENCES:
patent: 3293460 (1966-12-01), Iwai et al.
patent: 3696260 (1972-10-01), Lace
patent: 4127802 (1978-11-01), Johnson
patent: 4406958 (1983-09-01), Palmero et al.
patent: 5047680 (1991-09-01), Torok
patent: 2002/0036437 (2002-03-01), Kurosawa et al.

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