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US 5,841,261 AGranted
System for controlling stepping motor for dividing a single step of the motor into plural sections and applying voltages whose levels are determined in accordance with the sections
AssigneeCanon Kabushiki Kaisha
InventorsTakashi Nojima, Soichi Hiramatsu, Hideki Yamaguchi, Hiroyuki Inoue, Hitoshi Nakamura, Akira Kida, Hideaki Kawakami, Takeshi Iwasaki
Life of this patent
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Abstract
A system for smoothly driving a stepping motor with constant currents. For that purpose, a voltage level setting circuit forms various combinations of voltage levels for a first phase and voltage levels for a second phase. Drive currents of the stepping motor are determined using the various combinations for a plurality of times during one step drive of the stepping motor.
Claims10
A system for controlling a stepping motor, comprising:
- a stepping motor;
- drive means for driving said stepping motor, said drive means receiving a step drive signal for changing the excitation phase of said stepping motor and to determine a drive current of said stepping motor in accordance with an input voltage input thereto;
- step drive signal generating means for supplying the step drive signal to said drive means to step-drive said stepping motor;
- signal generation means for generating a plurality of control signals in a range of a single step driving of said stepping motor;
- and
- level setting voltage generating means for dividing said single step driving range of said stepping motor into a plurality of sections in accordance with the plurality of control signals generated by said signal generation means and for supplying voltages whose levels are determined in accordance with said divided sections to said drive means.
3 more elements
A system for controlling a stepping motor, comprising:
- a stepping motor;
- drive means for driving said stepping motor, said drive means receiving an excitation phase changeover signal for changing the excitation phase of said stepping motor and to determine a drive current of said stepping motor in accordance with an input voltage input thereto;
- control means, for controlling said stepping motor, having an excitation phase changeover signal generation means for driving said stepping motor by applying an excitation phase changeover signal to said drive means, wherein said control means includes level forming signal generation means for generating a plurality of level forming signals in a single driving step of said stepping motor from the time a magnetization signal is generated until a next magnetization signal is generated;
- and
- level voltage generation means for dividing a single driving step of said stepping motor into a plurality of sections in accordance with said plurality of level forming signals generated by said level forming signal generation means and for applying voltages, whose levels are determined in accordance with said plurality of sections, to said driving means as an input voltage.
2 more elements
Dependencies are inferred from the claim text.