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US 3,947,740 AGranted
Regenerative brake control system for DC motor
AssigneeHitachi, Ltd.
InventorTakashi Tsuboi
Life of this patent
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Abstract
A regenerative brake control system for controlling an armature current of DC motor by on-off operation of a chopper through resistor means which is connected in series with the DC motor and is appropriately divided into sections is disclosed. In the system, the notching operation of the resistor means is controlled in such a manner that the duty cycle of the chopper immediately following the short-circuiting of one section of the resistor means is to be the minimum value tolerable to the chopper.
Claims11
A regenerative brake control system for a DC motor comprising:
- a DC motor;
- resistor means connected in series with said DC motor and including at least one resistor section;
- switch means for short-circuiting said resistor section of said resistor means;
- circuit means through which regenerative current is passed for regenerative braking by returning power generated by said DC motor to a power supply;
- chopper means, connected in parallel to a series circuit of said DC motor and said resistor means, for controlling the armature current of said DC motor by on-off operation thereof;
- means for controlling the duty cycle of said chopper means;
- and means for controlling the operation of said switch means in a manner so that the duty cycle immediately following the short-circuiting of said resistor section of said resistor means is a minimum value tolerable to said chopper means.
4 more elements
Dependencies are inferred from the claim text.