Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1998-08-10
1999-08-17
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318434, 318500, 318519, 388903, H02H 708, H02P 624
Patent
active
059398507
ABSTRACT:
A circuit for driving a three-phase brushless DC motor (301) includes a neutral point feedback circuit (201) which operates a three-phase output circuit (202) so that a neutral point potential (V.sub.C) of the motor (301) is maintained at a predetermined potential, and a neutral point potential comparison circuit (500) which determines whether or not the neutral point potential (V.sub.C) is between reference potentials (V.sub.ref1, V.sub.ref2). If the neutral point potential (V.sub.C) is not between the reference potentials (V.sub.ref1, V.sub.ref2), a switch shutoff signal (SC) is activated to turn off a switch (106), so that a current (I.sub.C) is not provided to the neutral point feedback circuit (201). Accordingly, the neutral point feedback circuit (201) stops flowing currents (I.sub.A, I.sub.B) to the three-phase output circuit (202) which in turn stops driving the motor (301). The circuit for driving the motor (301) is prevented from being broken down if a short circuit occurs in the motor (301).
REFERENCES:
patent: 4641066 (1987-02-01), Nagata et al.
patent: 5374880 (1994-12-01), Kondoh et al.
patent: 5491622 (1996-02-01), Carosa
patent: 5761375 (1998-06-01), Naito
patent: 5877602 (1999-03-01), Knodoh et al.
Mitsubishi Denki & Kabushiki Kaisha
Mitsubishi Electric Engineering Co. Ltd.
Ro Bentsu
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