Permanent magnet type stepping motor

Details Permanent magnet type stepping motor Permanent magnet type stepping motor

1985-02-25

1986-01-07

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Linear

310 30, 310 49R, H02K 4102

Patent

active

045636028

ABSTRACT:
A permanent magnet type stepping motor is provided. The rotor is made of a cylindrical laminated iron core whose outer periphery is toothed at an equal pitch, and the number of teeth is Nr. The stator is made of a laminated iron core whose inner periphery is formed so as to face the rotor at an air gap between the rotor and the stator. Thin plate permanent magnets are attached on the surface of the stator teeth facing the air gap. The permanent magnets are disposed at an equal pitch and polarized such that the polarities of adjacent pole pieces differ from each other. The number of pole pieces is Ns, and has a relation Ns=2(Nr.+-.Np), where Np is an integer more than 1. The stator grooves are half opened or closed and have multiphase 2 Np pole distributed windings.

REFERENCES:
patent: 3999090 (1976-12-01), Sinnott
patent: 4217507 (1980-08-01), Jaffe
patent: 4243899 (1981-01-01), Jaffe
patent: 4349757 (1982-09-01), Bhafe
patent: 4370577 (1983-01-01), Wakabayashi et al.
patent: 4504750 (1985-03-01), Onodera et al.
IBM Tech Disclosure Bulletin, "Linear Incremental Motor", Thompson, vol. 6, No. 9, 2/64.

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