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US 6,462,503 B1Granted
Drive control system for stepping motor
AssigneeCanon Kabushiki Kaisha
InventorSadatoshi Narazaki
Life of this patent
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Abstract
A device is provided for chopping a control signal of an initial excitation phase or a final excitation phase by a predetermined cycle during low speed rotation control of an excitation phase control signal (excitation control signal) of a stepping motor when acceleration control and deceleration control of the stepping motor are effected, thereby reducing an excessively great driving current created during low speed rotation of the stepping motor, particularly the initial retaining excitation period during acceleration control and the final retaining excitation period during deceleration.
Claims14
A drive control system for a stepping motor comprising:
- a stepping motor;
- a read-only memory for storing a table for controlling said stepping motor;
- a timer for counting a timing switching a phase excitation signal of said stepping motor;
- a microprocessor unit for controlling said stepping motor by the table stored in said read-only memory;
- and
- discriminating means for discrminating whether or not it is in an acceleration initial excitation period, said stepping motor being chopped by a chopping duration stored in said read-only memory if discriminated that it is in the acceleration initial excitation period.
3 more elements
A drive control system for a stepping motor comprising:
- a stepping motor;
- a read-only memory for storing a table for controlling said stepping motor;
- a timer for counting a timing switching a phase excitation signal of said stepping motor;
- a microprocessor unit for controlling said stepping motor by the table stored in said read-only memory;
- and
- discriminating means for discriminating whether of not it is in a deceleration initial excitation period, said stepping motor being chopped by a chopping duration stored in said read-only memory if discriminated that it is in the deceleration initial excitation period.
3 more elements
A drive control system for a stepping motor comprising:
- a stepping motor;
- a read-only memory for storing a table for controlling said stepping motor;
- a timer for counting a timing switching a phase excitation signal of said stepping motor;
- a microprocessor for controlling said stepping motor by the table stored in said read-only memory;
- discriminating means for discriminating whether or not it is in an acceleration initial excitation period, said stepping motor being chopped by a chopping duration stored in said read-only memory if discriminated that it is in the acceleration initial excitation period;
- and
- discrminating means for discriminating whether or not it is in a deceleration initial excitation period, said stepping motor being chopped by a chopping duration stored in said read-only memory if discriminated that it is in the deceleration initial excitation period.
4 more elements
A drive control system for a stepping motor comprising:
- a stepping motor;
- an electrical power source for supplying an electrical power to said stepping motor;
- a read-only memory for storing a table for controlling said stepping motor;
- a timer for counting a timing switching a phase excitation signal of said stepping motor;
- a microprocessor unit for controlling said stepping motor by the table stored in said read-only memory;
- and
- discrminating means for discriminating whether or not it is in an acceleration initial excitation period, said stepping motor being chopped by a chopping duration stored in said read-only memory if discriminated that it is in the acceleration initial excitation period.
4 more elements
A drive control system for a stepping motor comprising;
- a stepping motor;
- an electrical power source for supplying an electrical power to said stepping motor;
- a read-only memory for storing a table for controlling said stepping motor;
- a timer for counting a timing switching a phase excitation signal of said stepping motor;
- a microprocessor unit for controlling said stepping motor by the table stored in said read-only memory;
- and
- discriminating means for discriminating whether or not it is in a deceleration initial excitation period, said stepping motor being chopped by a chopping duration stored in said read-only memory if discriminated that it is in the deceleration initial excitation period.
4 more elements
A drive control system for a stepping motor comprising:
- a stepping motor;
- an electrical power source for supplying an electrical power to said stepping motor;
- a read-only memory for storing a table for controlling said stepping motor;
- a timer for counting a timing switching a phase excitation signal of said stepping motor;
- a microprocessor unit for controlling said stepping motor by the table stored in said read-only memory;
- discriminating means for discriminating whether or not it is in an acceleration initial excitation period, said stepping motor being chopped by a chopping duration stored in said read-only memory if discriminated that it is in the acceleration initial excitation period;
- and
- discriminating means for discrminating whether or not it is in a deceleration initial excitation period, said stepping motor being chopped by a chopping duration stored in said read-only memory if discriminated that it is in the deceleration initial excitation period.
5 more elements
Dependencies are inferred from the claim text.