Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1991-11-01
1993-02-23
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318654, 341116, H02K 2400
Patent
active
051893533
ABSTRACT:
A resolver system includes a resolver having an annular rotor, and an annular stator arranged around the annular rotor in spaced relationship thereto. The rotor and the stator are arranged such that the reluctance of a space defined between the rotor and the stator varies with a change in the angular position of the rotor in such a fashion that one revolution of the rotor causes one cycle of a fundamental frequency component of variation of the reluctance.
The stator has formed thereon a plurality of pole shoes circumferentially arranged at intervals of 120.degree. or 60.degree. to form three of six phases, each of the pole shoes having a single kind of winding wound thereon. A servo driver applies an excitation signal to each of the windings on the pole shoes of the stator to excite same. Further, the servo driver is responsive to a value of current flowing in each of the windings which is variable with variation of the reluctance, for generating a speed signal indicative of the rotational speed of the rotor and a position signal indicative of the angular position of the rotor.
REFERENCES:
patent: 4551708 (1985-11-01), Welburn
patent: 4568865 (1986-02-01), Welburn
patent: 5032750 (1991-07-01), Hayashi
Nippon Seiko Kabushiki Kaisha
Ro Bentsu
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