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US 4,382,693 AGranted
Single phase bipolar stepping motor having two rotation senses
AssigneeSociete Suisse pour l'Industrie Horlogere Management Services S.A.
InventorMai Tu Xuan
Life of this patent
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Abstract
The invention comprises a single phase bipolar stepping motor in which the otor may rotate in both senses. A stator is provided having two windings. When these are connected in series and fed with a first type of alternating polarity pulses, the rotor turns in a preferred sense. When the windings are connected in parallel and fed by a second type of alternating polarity pulses of opposite phase to the first type the rotor turns in the opposite sense. The motor is applied to advantage in time setting arrangements for analog display timepieces.
Claims12
A timepiece motor assembly including:
- a single-phase bipolar electromagnetic stepping motor including a rotor formed of a magnet having at least one pair of poles and a stator formed of a soft ferromagnetic material extending between said poles and two windings wrapped thereabout, said rotor being capable of rotation in both senses;
- a signal-feeding means coupled to said two windings for energizing said two windings with first and second types of electrical pulses for respectively causing rotation of said rotor in opposite senses, said signal-feeding means including switching means for interconnecting said windings in series one with the other to receive said first type of electrical pulses and thereby rotate said rotor in a first sense and for interconnecting said windings in parallel one with the other to receive said second type of electrical pulses and thereby rotate said rotor in an opposite sense.
Dependencies are inferred from the claim text.