Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1997-12-17
1999-06-22
Wysocki, Jonathan
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
318440, H02P 5178
Patent
active
059150700
ABSTRACT:
A motor driving apparatus PWM-controls a DC voltage from a rectifying unit according to a rotation speed setting information, and drives a motor by voltage pulse chooped by PWM. The rectifying unit is controlled so that a full-wave rectification is performed when the motor runs at a rotation speed below a prescribed rotation speed and a voltage-doubler rectification is performed when the motor runs at a rotation speed above the prescribed rotation speed. On the other hand, in case a motor drives a compressor of an air-conditioning system, the rectifying unit is controlled so that the full-wave rectification is performed when the air-conditioning system is a cooling operation and the voltage-doubler rectification is performed when the air-conditioning system is a heating operation. When the rectifying unit is controlled for the full-wave rectification, even if a width of voltage pulse given to the motor is decreased, a voltage value of the voltage pulse is half as compared with the voltage-doubler rectification. Hence, since a motor current is small and its current variation is also small, a hysteresis loop due to a variation in magnetic flux becomes small and an iron loss is reduced. When the rectifying unit is controlled for the voltage-doubler rectification, since a DC voltage which is the double of that of the full-wave rictification is supplied, the motor capacity can be increased.
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Takagi Nobukazu
Takekawa Yoriyuki
Wysocki Jonathan
Zexel Corporation
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