# US 2014/0152206 A1 · Control device for alternating current rotating machine and electric power steering device equipped with control device for alternating current rotating machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152206 A1 - Document ID: US20140152206A1 - Status: Published application - Kind: A1 - Application number: 14/234,202 - Filed: 2011-11-17 - Published: 2014-06-05 - Earliest claimed: 2011-11-17 - Assignees: Mitsubishi Electric Corporation - Inventors: Yoshihiko Kimpara; Yasuaki Hori; Masashi Iwane; Tatsuya Mori; Yuji Takatsuka; Mamoru Shiraki - Web page: https://patentgrep.com/patent/US20140152206A1 ## CPC - H02P 21/22: Current control, e.g. using a current control loop - B62D 5/046: {Controlling the motor} - H02P 21/0085: {specially adapted for high speeds, e.g. above nominal speed} - H02P 23/0086: {specially adapted for high speeds, e.g. above nominal speed} - 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) ## Abstract A control device for an AC rotating machine includes a voltage command calculation means (1) that calculates voltage commands on rotation two axes and a voltage applying means (2) that applies a voltage to an AC rotating machine (3), based on voltage commands on the rotation two axes outputted by the voltage command calculation means (1); the voltage command calculation means (1) calculates first-axis and second-axis voltage commands on the rotation two axes and reduces the limit value of the second-axis voltage command in proportion to the squared first-axis voltage command. ## Claims ### Claim 1 A control device for an AC rotating machine comprising: a voltage command calculation means that calculates voltage commands on rotation two axes; and a voltage applying means that applies a voltage to an AC rotating machine, based on voltage commands on the rotation two axes outputted by the voltage command calculation means, wherein the voltage command calculation means calculates first-axis and second-axis voltage commands on the rotation two axes and reduces the limit value of the second-axis voltage command in proportion to the squared first-axis voltage command. ### Claim 2 (depends on 1) The control device for an AC rotating machine according to claim 1, wherein the voltage command calculation means sets the limit value of the second-axis voltage command that decreases in proportion to the squared first-axis voltage command to the upper limit value of the second-axis voltage command or the lower limit value of the second-axis voltage command. ### Claim 3 (depends on 1) The control device for an AC rotating machine according to claim 1, wherein the voltage command calculation means allows not only a positive value but also a negative value, as the limit value of the second-axis voltage command that decreases in proportion to the squared first-axis voltage command. ### Claim 4 (depends on 1) The control device for an AC rotating machine according to claim 1, wherein the first axis on the rotation two axes is set to a direction having the same phase as the rotor magnetic flux of the AC rotating machine, and the second axis on the rotation two axes is set to a direction that is perpendicular to the first axis on the rotation two axes. ### Claim 5 (depends on 3) The control device for an AC rotating machine according to claim 3, wherein the first axis on the rotation two axes is set to a direction having the same phase as the rotor magnetic flux of the AC rotating machine, and the second axis on the rotation two axes is set to a direction that is perpendicular to the first axis on the rotation two axes. ### Claim 6 (depends on 1) An electric power steering apparatus including the control device for an AC rotating machine according to claim 1. ### Claim 7 (depends on 2) The control device for an AC rotating machine according to claim 2, wherein the voltage command calculation means allows not only a positive value but also a negative value, as the limit value of the second-axis voltage command that decreases in proportion to the squared first-axis voltage command. ### Claim 8 (depends on 2) The control device for an AC rotating machine according to claim 2, wherein the first axis on the rotation two axes is set to a direction having the same phase as the rotor magnetic flux of the AC rotating machine, and the second axis on the rotation two axes is set to a direction that is perpendicular to the first axis on the rotation two axes. ### Claim 9 (depends on 7) The control device for an AC rotating machine according to claim 7, wherein the first axis on the rotation two axes is set to a direction having the same phase as the rotor magnetic flux of the AC rotating machine, and the second axis on the rotation two axes is set to a direction that is perpendicular to the first axis on the rotation two axes.