Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1989-11-01
1991-01-08
Ro, Bentsu
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318696, H02P 740
Patent
active
049839020
ABSTRACT:
A circuit (40) for controlling a variable reluctance motor in accordance with the invention includes a first switch (Q1) having first and second electrodes, the first electrode being connectable to a first potential (14) of a DC power supply (12) and the second electrode being connected to a first terminal of each phase winding of the motor, and at least one additional switch (Q2-Q4), the first electrode of each additional switch being connected to a second terminal of an associated phase winding and the second electrode of each additional switch being connectable to a second potential (16) of the DC power supply; a number of freewheel diodes (20), a first electrode of each freewheel diode being connected to the second terminal of an associated phase winding and a second electrode of each freewheel diode being connectable to the first potential of the DC power supply; a first diode (24) coupled to the firt terminal of each phase winding; a controller (18) for generating control signals of each of the switches; and a circuit (42) coupled to the first electrode of the first diode, for stopping the current flow in a phase winding connected to the switches being turned off, for generating a potential applied to the phase winding which opposes a potential induced in the phase winding connected to the switches being turned off in response to turning off of the switches to accelerate stopping current flow in the winding connected to the switches being turned off.
REFERENCES:
patent: 4272713 (1981-06-01), Pritchard
patent: 4295083 (1981-10-01), Leenhouts
patent: 4329635 (1982-05-01), Reilly
patent: 4486696 (1984-12-01), Matsushita et al.
patent: 4500824 (1985-02-01), Miller
patent: 4514675 (1985-04-01), Matumoto et al.
patent: 4584506 (1986-04-01), Kaszmann
patent: 4609859 (1986-09-01), Williams
patent: 4684867 (1987-08-01), Miller et al.
patent: 4760320 (1988-07-01), Tsugita
Dhyanchand John J.
Palaniappan Rasappa
Ro Bentsu
Sundstrand Corporation
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