Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1990-05-09
1992-04-28
Witkowski, Stanley J.
Electricity: motive power systems
Switched reluctance motor commutation control
318280, H02K 4100
Patent
active
051091844
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a direct current motor, which is employed, for instance, as a driving source for constant speed drive, constant torque drive or servo control in various industrial instruments, and more particularly, to a high-speed 3-phase direct current motor.
BACKGROUND ART
Conventionally, (brushless motors), which include induction motors using inverters, semiconductor motors and colorless motors having a small inductance, are employed as high speed motors. However, a motor of this kind is large in size and high in cost because it generally comprises a direct current power source for rectifying an output from an alternating current power source. The above defect becomes significant, particularly, in the case of a motor including an inverter. Further, the maximum rotation speed of the conventional electric motor varying from approximately 3000 to 6000 rpm decreases below the above rotation speed when the motor is arranged to generate a high power output. When an increased voltage is applied to the electric motor so as to increase the rotation speed, the efficiency of the electric motor is lowered to the extent that it becomes particularly useless. Heretofore, no electric circuit is provided, which is adapted to be mounted on the motor for constant torque driving, constant speed driving or servo control and is stably operable at high speeds. In particular, efficiently operable one is not developed.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a direct current motor, which is operable at high rotation speeds with high efficiency, and is small in size and low-priced.
Another object of the present invention is to provide a direct current motor whose output torque can be variably controlled.
In order to achieve the above objects, one aspect of the present invention comprises: a position detection device for sequentially supplying a plurality of position detection signals, corresponding in number to phases of a direct current motor and associated with the respective phases of the direct current motor, in dependence on a rotation position of a rotor of the direct current motor; a current supply controlling circuit connected to a direct current power source, for sequentially supplying currents to armature coils of respective phases in response to the position detection signals; and circuit means for supplying a magnetic energy stored in one of the armature coils which is interrupted to be supplied with current into a next one of the armature coils which is to be next supplied with current at the time of interruption of current supply to the armature coil of respective phase, thereby rapidly extinguishing the stored magnetic energy and rapidly raising an armature current flowing in the armature coil to be next supplied with current.
Another aspect of the present invention comprises: a position detection device for sequentially supplying a first position detection signal group including a plurality of position detection signals corresponding in number to phases of a direct current motor and associated with respective phases of the direct current motor and a second position detection signal group including a plurality of position detection signals with preset phase differences with respect to the corresponding position detection signals of the first position detection signal group, in dependence on a rotation position of a rotor of the direct current motor; a current supply controlling circuit connected to a direct current power source, for sequentially supplying currents to armature coils of respective phases in a forward direction in response to the first position detection signal group, and for sequentially supplying currents to the armature coils of respective phases in a reverse direction in response to the second position detection signal group; and circuit means for supplying a magnetic energy stored in one of the armature coils which is interrupted to be supplied with current into a next one of the armature coils which is to be next suppli
REFERENCES:
patent: 4446406 (1984-05-01), Uzuka
patent: 4508998 (1985-04-01), Hahn
patent: 4563622 (1986-01-01), Deavers et al.
patent: 4645991 (1987-02-01), Ban et al.
patent: 4743813 (1988-05-01), Tassinario
patent: 4958115 (1990-09-01), Miller
Kabushikigaisha Sekogiken
Witkowski Stanley J.
Wysocki A. Jonathan
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