Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1983-04-20
1984-09-11
Truhe, J. V.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 368157, H02K 2904
Patent
active
044712847
ABSTRACT:
The motor comprises a stator with three pole pieces having pole faces which define a cylindrical space, two windings which are magnetically coupled to the first and the second pole piece, and to the first and the third pole piece respectively, a rotor which is concentric with respect to the cylindrical space and which comprises a first permanent magnet, and a second permanent magnet coupled with the first magnet for holding the rotor, in the absence of any other influence, in a position in which the magnetic axis of the first magnet coincides with a rest axis. The field produced in the cylindrical space by the flow of a current in any one of the windings is at an obtuse angle to the rest axis.
The rotor performs 360.degree. steps in response to pairs of current pulses, the first of which is applied to one of the windings and the second is applied to the other of the windings. Those pulses have always the same direction, and the order in which they are applied to the windings determines the direction of rotation of the rotor.
The motor can be used in particular in an electronic timepiece.
REFERENCES:
patent: 3958167 (1976-05-01), Nakamima et al.
patent: 4126796 (1978-11-01), Ito
patent: 4144467 (1979-03-01), Nakajima et al.
patent: 4361790 (1982-11-01), Laesser et al.
patent: 4367049 (1983-01-01), Laesser et al.
patent: 4371821 (1983-02-01), Laesser et al.
patent: 4382693 (1983-05-01), Tu Xuan
patent: 4396846 (1983-08-01), Calame
patent: 4423342 (1983-12-01), Mokdad
Bergmann Saul M.
ETA S.A., Fabriques d'Ebauches
Truhe J. V.
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