Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1992-12-30
1994-09-27
Wysocki, Jonathan
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318254, H02P 700
Patent
active
053509870
ABSTRACT:
A rotor magnet is provided with a plurality of magnetic poles spaced by equal angular intervals. A stator has a core divided into a plurality of segments spaced by equal angular intervals. The stator has polyphase stator windings provided on the core segments respectively. First ends of the stator windings are connected to each other at a common junction, and second ends thereof are separate from each other. The number of the core segments differs from that of the magnetic poles. The core segments corresponding to one phase substantially face centers of the magnetic poles of a same type while the core segments corresponding to other phases face positions offset from centers of the magnetic poles. Test currents are fed to the stator windings via the second ends sequentially in different current-feed patterns. Voltages at a given measurement point are detected which occur in correspondence with the different current-feed patterns respectively. Differences are detected between a predetermined reference voltage and the detected voltages at the given measurement point which correspond to the different current-feed patterns respectively. Determination is given of a current-feed pattern from among the different current-feed patterns which corresponds to a maximal difference from among the detected differences. A position of the rotor relative to the stator is detected in response to the feed current corresponding to the determined current-feed pattern.
REFERENCES:
patent: 4460859 (1984-07-01), Remus et al.
patent: 4678973 (1987-07-01), Elliott et al.
patent: 4752724 (1988-06-01), Radziwill et al.
patent: 4868467 (1989-09-01), Davis
patent: 4876491 (1989-10-01), Squires et al.
patent: 4992710 (1991-02-01), Cassat
Victor Company of Japan Ltd.
Wysocki Jonathan
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