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US 6,407,527 B1Granted
Motor drive control apparatus
AssigneeCanon Kabushiki Kaisha
InventorHiroyoshi Misumi
Life of this patent
Estimating the term…
Abstract
In a motor drive control apparatus, without using a current control circuit, a gate circuit, and a minus power supply, a short period (a period in which either one of Nch and Pch FETs is turned on without supplying currents from the FET elements to coils of a motor at the same time at electrical power supply points) is provided between one cycle of duty control of the FET elements and the next cycle, and a total current flowing to the motor is controlled by controlling a width of the period.
Claims9
A motor drive control apparatus comprising:
- a motor including a plurality of electrical power supply points connected to a plurality of coils;
- feeding means for feeding a current into the respective electrical power supply points drawing means for drawing a current from the respective electrical power supply points;
- determining means for determining states of the respective electrical power supply points;
- changing means for changing the amount of current fed to or drawn from the respective electrical power supply points by means of controlling said feeding means and said drawing means in accordance with the states of the respective electrical power supply points determined by said determining means, so as to control current flowing through the plurality of coils by changing the amount of the current fed to or drawn from the respective electrical power supply points;
- and
- setting means for setting all the electrical power supply points at the same time to either one of a state where the current is drawn from the electrical power supply points by said drawing means and a state where the current is fed to the electrical power supply points by said feeding means, so as to establish a short period in which no current flows through the plurality of coils.
3 more elements
Dependencies are inferred from the claim text.