Angular position selecting apparatus

Details Angular position selecting apparatus Angular position selecting apparatus

1991-01-18

1993-02-23

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318290, 318590, G05B 1101

Patent

active

051893541

ABSTRACT:
A permanent magnet rotor is connected to an output shaft and has more than one pair of magnetic poles. A stator has three phases connected in Y-connection including a first phase, a second phase, and a third phase. Each phase has as many series-connected coils as there are pairs of the poles of the magnet rotor. A timer circuit outputs a first signal for a predetermined length of time when a target angular position of said rotor is selected. On the basis of a present angular position of the rotor and the target angular position of the rotor, a rotation direction commanding circuit outputs a second signal indicative of the rotation direction of rotor. In accordance with the signal, a current polarity control circuit supplies a first current to the first phase (subcoils) in accordance with the first signal and a second current to the second and third phases (main coils) in accordance with the second signal so as to drive the rotor into rotation to the target angular position. The first phase is supplied the first current for a predetermined length of time in accordance with the first signal. The second and third phases remain supplied the current to them so that the rotor stays at the target angular position.

REFERENCES:
patent: 4028599 (1977-06-01), Zankl et al.
patent: 4684866 (1987-08-01), Nehmer et al.
patent: 4710690 (1987-12-01), Reid et al.
patent: 4942346 (1990-07-01), Ardot et al.
patent: 5034670 (1991-07-01), Tominga

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