Control circuit for electromagnetic actuator

Details Control circuit for electromagnetic actuator Control circuit for electromagnetic actuator

1990-04-04

1991-07-23

Ro, Bentsu

Electricity: motive power systems

Nonrunning, energized motor

188282, 188299, 188319, F16K 3102, B60G 1700

Patent

active

050346709

ABSTRACT:
An actuator comprises a housing; a permanent magnet arranged in the housing to be rotatable; an output shaft coupled to the permanent magnet; a stator fixed in the housing in such manner to be separated from the outer peripheral surface of the permanent magnet in diametrical directions, the stator having its inner peripheral surface provided with alternately projections and spaces; coils on the stator, and excitation switching means for switching the excitation of the coils; wherein the number of the projections and the number of the spaces in the stator is three times that of the pole pairs of the permanent magnet, and wherein the excitation switching means is connected to the coils so that the magnetic field which attracts the permanent magnet is developed by the coils which lie at the respective sides of the space opposite to the magnetic pole reversing portion of the permanent magnet, the space being corresponding to the position where the magnetic pole reversing portion of the permanent magnet is desired to stop after the permanent magnet has started to rotate.

REFERENCES:
patent: 3749956 (1973-07-01), Reiss
patent: 4287457 (1981-09-01), Takemura
patent: 4526401 (1985-07-01), Kakizaki et al.
patent: 4527676 (1985-07-01), Emura et al.
patent: 4639627 (1987-01-01), Takekoshi et al.
patent: 4752707 (1988-06-01), Morrill
patent: 4815575 (1989-03-01), Murty
patent: 4837468 (1989-06-01), Froment
patent: 4874975 (1989-10-01), Hertrich
patent: 4926983 (1990-05-01), Taubitz et al.

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