Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1996-03-27
1998-07-14
Martin, David S.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, A02P 602
Patent
active
057809836
ABSTRACT:
A brushless DC motor drive apparatus according to the invention comprises a stator and a rotor, the stator including multi-phase armature windings which are connected in a star formation and generate a plurality of terminal voltages at respective terminals of the armature windings, and the rotor including a plurality of permanent magnets which form pairs of magnetic poles. The motor drive apparatus also includes an inverter coupled to the rotor for adjusting the speed of the rotor, a rotor position detection means for detecting the terminal voltages generated in the armature windings and for generating a position signal indicative of a magnetic pole position of the rotor. The rotor position detection means includes a line voltage generation means for generating line voltages corresponding to the terminal voltages of the armature windings and comparison means for comparing signals derived from the line voltages in predetermined combinations and outputting comparison signals as the positional signal. The motor drive apparatus also includes a drive control means for controlling and driving the inverter according to the position signal generated by the rotor position detection means, the drive control means including PWM (Pulse Width Modulation) chopper control means for generating a PWM chopper control signal to control the inverter. The motor drive apparatus according to the present invention can always detect accurate rotor position without being affected by the rotational frequency or load of the brushless DC motor. Furthermore, the motor drive apparatus can easily expand the operational range of a brushless DC motor, particularly that of a brushless DC motor possessing an embedded magnet-type rotor structure. Additionally, the motor drive apparatus can easily and accurately operate a brushless DC motor according to its motor characteristics and control method.
REFERENCES:
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patent: 5486743 (1996-01-01), Nagai
patent: 5491393 (1996-02-01), Uesugi
"Wide Speed Control of Interior Permanent Magnet Synchronous Motor" Shigeo Morimoto, et al., IEE Japan, vol. 114-D, No. 6, 1994. (partial translation).
Shinkawa Osamu
Uetake Akihito
Martin David S.
Seiko Epson Corporation
Watson Mark P.
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