# US 2013/0278198 A1 · Motor control device and electric power steering device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278198 A1 - Document ID: US20130278198A1 - Status: Published application - Kind: A1 - Application number: 13/976,259 - Filed: 2012-01-06 - Published: 2013-10-24 - Earliest claimed: 2011-01-06 - Assignees: Jtekt Corporation - Inventors: Takehiro Ito - Web page: https://patentgrep.com/patent/US20130278198A1 ## CPC - H02P 29/0241: {the fault being an overvoltage} - B62D 5/049: {detecting sensor failures} - H02M 1/32: Means for protecting converters other than automatic disconnection - H02P 27/08: with pulse width modulation - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract A motor control device includes an anomaly detection means that detects an anomaly occurring on power feeding paths of respective phases on the basis of first electric current values, second electric current values of the respective phases and a phase electric current value obtained by the first electric current values and the second electric current values. When at least one of an absolute value of the first electric current value and an absolute value of the second electric current value exceeds a first threshold value corresponding to a limit value of an electric current detection and an absolute value of the phase electric current value is smaller than a second threshold value corresponding to zero in any one phase, the anomaly detection means determines that an anomaly of an electric current sensor has occurred as regards the corresponding phase. ## Claims ### Claim 1 A motor control device comprising: an electric current detection means that detects phase electric current values of three phases to be electrically conducted to a motor; a motor control signal output means that outputs a motor control signal by executing electric current control, in which a triangular wave is a PWM carrier, based on the respective phase electric current values; and a drive circuit that outputs drive power to the motor, based on the motor control signal, wherein the drive circuit is configured by parallel connecting switching arms in correspondence to the respective phases, each of the switching arms having a pair of switching elements turning on/off on the basis of the motor control signal and connected in series with each other, wherein electric current sensors are provided to low-voltage sides of the respective switching arms, wherein the electric current detection means detects first electric current values of the respective phases by acquiring output signals of the respective electric current sensors at timing at which the triangular wave becomes a peak, detects second electric current values of the respective phases by acquiring output signals of the respective electric current sensors at timing at which the triangular wave becomes a bottom, and detects phase electric current values of the respective phases based on differences of the respective first electric current values and the respective second electric current values, wherein an anomaly detection means that detects an anomaly occurring on power feeding paths of the respective phases on the basis of the first electric current values, the second electric current values and the phase electric current value is provided, and wherein when at least one of an absolute value of the first electric current value and an absolute value of the second electric current value exceeds a first threshold value corresponding to a limit value of the electric current detection and an absolute value of the phase electric current value is smaller than a second threshold value corresponding to zero in any one phase, the anomaly detection means determines that an anomaly of the electric current sensor has occurred as regards the corresponding phase. ### Claim 2 (depends on 1) The motor control device according to claim 1, wherein when the anomaly of the electric current sensor has occurred, the motor control signal output means outputs the motor control signal in which two phases other than the phase with the anomaly are used as an electric conductive phase. ### Claim 3 (depends on 1) The motor control device according to claim 1, wherein when the absolute value of the phase electric current value exceeds a third threshold value corresponding to the limit value and the first electric current value or second electric current value is smaller than a fourth threshold value corresponding to a lower limit value of the electric current detection, the anomaly detection means determines that a short anomaly of the switching element has occurred as regards the corresponding phase. ### Claim 4 (depends on 1) An electric power steering device comprising the motor control device according to claim 1.