Linear motor

Details Linear motor Linear motor

1994-09-29

1997-02-11

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Linear

310 12, 310 68B, H02K 4102

Patent

active

056024312

ABSTRACT:
A linear motor is operated as an m-phase linear pulse motor or a brushless DC linear motor capable of producing large driving force. The linear motor includes an even number N of salient poles 11, 12, . . . disposed at an equal pitch angle and includes a stator 1 having a plurality of permanent magnet poles disposed on inner peripheral surfaces of the salient poles to have polarities different from each other in the shaft direction and a mover 3 disposed movably in the shaft direction. The salient poles are constituted by pairs of the salient poles adjacent to each other and include m sets of salient pole groups each composed of (N/m) salient poles disposed at an angle of (720 m/N) degrees and windings W1, W2, . . . wound on (N/m)-1 or (N/m)-2 salient poles belonging to the salient pole groups are connected to have opposite polarities between the pair of salient poles and are connected to have the same polarity between the salient poles which do not constitute the pair of salient poles and are disposed to interpose the salient poles for the other phase to constitute phase windings for m phases. Remaining salient poles of the salient pole group are caused to detect a position and a movement direction of the mover 3 as sensor poles S.sub.A and S.sub.B.

REFERENCES:
patent: 3441819 (1969-04-01), Palmero
patent: 5418413 (1995-05-01), Satomi
patent: 5438227 (1995-08-01), Satomi
patent: 5528090 (1996-06-01), Satomi
Patent Abstracts of Japan, vol. 13, No. 198 (E-756), May 11, 1989 & JP-A-01 019 958 (Japan Servo), Jan. 24, 1989.
IEEE Industry Applications Society Annual Meeting, 1991, pp. 115-120, Iwabuchi et al, "A novel inductor type high-torque motor with rare-each magnet".

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