Electricity: motive power systems – Linear-movement motors
Patent
1981-08-17
1987-09-22
Duggan, Donovan F.
Electricity: motive power systems
Linear-movement motors
310 12, H02K 4100
Patent
active
046957774
ABSTRACT:
A linear stepper motor of the variable reluctance type including (a) a stator having a plurality of stator teeth formed with an equal pitch p along a longitudinal direction, (b) a slider having four slider poles, A pole, B pole, C pole, and D pole arranged in a longitudinal direction in that order, each of the slider poles being provided with a plurality of slider teeth formed oppositely to, and with identical pitch with, the stator teeth, and (c) four windings, A phase, B phase, C phase and D phase respectively wound about each of the slider poles independently. In this linear stepper motor, distances separating the B pole, C pole and D pole from the A pole are determined to be (L+2/4)p, (M+1/4)p and (N+3/4)p or (L+2/4)p, (M+3/4)p and (N+1/4)p, respectively wherein L, M and N are natural numbers. And the four windings are connected to 2--2 phase excitation device for being repeatedly excited in at least one of the two sequences of A phase-C phase, C phase-B phase, B phase-D phase and D phase-A phase and the reversal of the former.
REFERENCES:
patent: 3265911 (1966-08-01), Madsen
patent: 3268747 (1966-08-01), Snowdon
patent: 3292065 (1966-12-01), Frederickson
patent: 3829746 (1974-08-01), Van et al.
patent: 3867676 (1975-02-01), Chai et al.
IBM Tech. Disclosure Bulletin, "Linear Incremental Motor", Thompson, vol. 6, No. 9, 2/1964, pp. 19-20.
Brother Kogyo Kabushiki Kaisha
Duggan Donovan F.
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