Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Reexamination Certificate
1999-10-07
2001-05-15
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
C318S254100, C318S432000, C318S721000
Reexamination Certificate
active
06232741
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application relates to and incorporates herein by reference Japanese Patent Application No. 10-289592 filed on Oct. 12, 1998.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multi-phase half-wave energization reluctance type electrical motor apparatus and a driving method therefor.
2. Related Art
A multi-phase reluctance type motor generally has a rotor and a stator wound with phase coils. It is simple in construction and capable of producing a large output torque. However, it is not suited for high speed rotation. Further, its output torque includes relatively large ripples. Thus, its application is limited to specified fields.
JP-A-8-126273 proposes one method of reducing ripples in the output torque by detecting the electric current flowing in each phase coil and shaping the electrical current flowing in each phase coil. However, this method requires a processing circuit for shaping the waveform of current flowing in each phase coil and a current sensor for detecting the current flowing in each phase coil.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a reluctance type motor, a driving circuit and a driving method therefor, which are capable of reducing ripples of output torque in a simple construction.
According to the present invention, a sum of electrical currents flowing in multi-phase coils is regulated to a predetermined reference value without detecting each phase current separately. The sum of the currents is detected by a current sensor provided at the side of coils than at junctions between switching devices and discharge current circulating diodes.
REFERENCES:
patent: 4143308 (1979-03-01), Deplante et al.
patent: 5138244 (1992-08-01), Bahn
patent: 5424624 (1995-06-01), Senak, Jr.
patent: 5621294 (1997-04-01), Bessette et al.
patent: 5627445 (1997-05-01), Webster
patent: 5663625 (1997-09-01), Sato et al.
patent: 6014001 (2000-01-01), Guinet
patent: 6014002 (2000-01-01), Guinet
patent: 2-285991 (1990-11-01), None
patent: 8-126273 (1996-05-01), None
Makita Shinji
Mimura Naohisa
Saitou Tomohiro
Takabe Yoshiyuki
Yoshida Hideji
Denso Corporation
Pillsbury & Winthrop LLP
Ro Bentsu
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