Brushless d.c. motor and switching device for use in such a d.c.

Details Brushless d.c. motor and switching device for use in such a d.c. Brushless d.c. motor and switching device for use in such a d.c.

1987-04-03

1988-05-31

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02K 2908

Patent

active

047483857

ABSTRACT:
A multi-phase brushless d.c. motor comprises a permanent-magnet rotor (1) and a stator (2) with stator coils (16, . . . , 21) arranged between three power lines (A, B, C). For the purpose of commutation the motor is provided with switching devices (22A, 22B, 22C) for the cyclic disconnection and connection of the power-supply lines (A, B, C) of the motor to a d.c. power source (25). Each switching device (22) comprises a section (42) which is controlled by the rotor-magnet field for deriving the disconnection instants and a section (43) for deriving the connection instants from a voltage change which is produced on the power-supply line connected to the switching device as a result of another power-supply line being disconnected.

REFERENCES:
patent: 4435673 (1984-03-01), Hagino et al.
patent: 4442386 (1984-04-01), Uchida et al.
patent: 4447771 (1984-05-01), Whited
patent: 4626752 (1986-12-01), Fujisaki et al.
patent: 4628231 (1986-12-01), Radziwill et al.
patent: 4644234 (1987-02-01), Nola

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