# US 6,407,527 B1 · Motor drive control apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,407,527 B1 - Document ID: US6407527B1 - Status: Granted - Kind: B1 - Application number: 09/637,110 - Filed: 2000-08-11 - Granted: 2002-06-18 - Earliest claimed: 1999-08-17 - Assignees: Canon Kabushiki Kaisha - Inventors: Hiroyoshi Misumi - Web page: https://patentgrep.com/patent/US6407527B1 ## CPC - H02P 8/14: Arrangements for controlling speed or speed and torque (H02P8/12, H02P8/22 take precedence) - G05B 19/40: Open loop systems, e.g. using stepping motor - H02P 8/36: Protection against faults, e.g. against overheating or step-out; Indicating faults - G05B 2219/42198: Step motor driven by step size and step duration data - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) A motor drive control apparatus according to claim 1, wherein the drawing means and said the feeding means are constituted by P-channel FET elements and N-channel FET elements. ### Claim 3 (depends on 1) A motor drive control apparatus according to claim 1, wherein said motor is a five-phase stepping motor. ### Claim 4 (depends on 1) A motor drive control apparatus according to claim 1, further comprising short period varying means for varying the short period established by said setting means. ### Claim 5 (depends on 4) A motor drive control apparatus according to claim 4, further comprising control period varying means for varying a control period in which the current is flowing through the plurality of coils, by controlling the ON/OFF period of said feeding means and said drawing means. ### Claim 6 (depends on 5) A motor drive control apparatus according to claim 5, wherein said short period varying means and said control period varying means vary the short period and the control period in accordance with an amount of current flowing through said motor. ### Claim 7 (depends on 6) A motor drive control apparatus according to claim 6, further comprising selection means for selecting said control period varying means when an amount of current flowing through said motor is large and control period varying means when the amount is small. ### Claim 8 (depends on 6) A motor drive control apparatus according to claim 6, further comprising detection means for detecting a current flowing to said motor. ### Claim 9 (depends on 1) A motor drive control apparatus according to claim 1, wherein the plurality of coils of said motor form pentagon connection in which the coils are connected to each other through the electrical power supply points to form a circle.