# US 11,309,826 B2 · Method and apparatus for controlling permanent magnet motor, power system and electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,826 B2 - Document ID: US11309826B2 - Status: Granted - Kind: B2 - Application number: 17/529,511 - Filed: 2021-11-18 - Published: 2022-03-10 - Granted: 2022-04-19 - Earliest claimed: 2020-06-15 - Assignees: Jiangsu Contemporary Amperex Technology Limited - Applicants: Jiangsu Contemporary Amperex Technology Limited - Inventors: Xiaojian Huang; Xiyang Zuo; Zhimin Dan; Bao Li - Web page: https://patentgrep.com/patent/US11309826B2 ## CPC - H02P 29/68: based on the temperature of a drive component or a semiconductor component - B60L 15/20: for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed - B60L 50/51: characterised by AC-motors - B60L 58/24: for controlling the temperature of batteries - B60L 58/27: by heating - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 10/486: {for measuring temperature} - B60L 2240/42: related to electric machines - B60L 2240/427: Voltage - B60L 2240/429: Current - B60L 2240/545: Temperature - B60L 2260/22: Standstill, e.g. zero speed - B60L 2270/142: acoustic - B60L 2270/145: Structure borne vibrations - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - H02P 2207/05: Synchronous machines, e.g. with permanent magnets or DC excitation - Y02E 60/10: Energy storage using batteries - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 10/72: Electric energy management in electromobility - Y02T 90/14: Plug-in electric vehicles - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method and an apparatus for controlling a permanent magnet motor, a power system and an electric vehicle. A power frequency of the permanent magnet motor is set by obtaining system parameters such as a resonance bandwidth of the permanent magnet motor and a natural frequency of a stator of the permanent magnet motor, and the permanent magnet motor is supplied power by using alternating current at the power frequency when a power battery meets a self-heating condition. Noises generated by the motor is reduced during a self-heating process of the power battery. ## Claims ### Claim 1 A method for controlling a permanent magnet motor, wherein the method comprises: obtaining system parameters of the permanent magnet motor, wherein the system parameters comprise: a resonance bandwidth of the permanent magnet motor and a natural frequency of a stator of the permanent magnet motor; setting a power frequency of the permanent magnet motor according to the system parameters; supplying power to the permanent magnet motor by using alternating current at the power frequency when a power battery meets a self-heating condition; wherein an even multiple of the power frequency is outside a resonance frequency band, and the resonance frequency band is determined according to the natural frequency of the stator and the resonance bandwidth of the permanent magnet motor. ### Claim 2 (depends on 1) The method according to claim 1, wherein that an even multiple of the power frequency is outside a resonance frequency band comprises: the even multiple of the power frequency is less than or equal to a lower boundary of the resonance frequency band. ### Claim 3 (depends on 2) The method according to claim 2, wherein that the even multiple of the power frequency is less than or equal to a lower boundary of the resonance frequency band is specifically: 2kf≤fei−B∀i=1,2, . . . ,M; wherein fei is an ith-order natural frequency of the stator of the permanent magnet motor, f is the power frequency, B is ½ of the resonance bandwidth of the stator of the permanent magnet motor, M is the highest order of the natural frequency of the stator of the permanent magnet motor, and k is a positive integer. ### Claim 4 (depends on 3) The method according to claim 3, wherein M=4. ### Claim 5 (depends on 1) The method according to claim 1, wherein that an even multiple of the power frequency is outside a resonance frequency band comprises: the even multiple of the power frequency is greater than or equal to an upper boundary of the resonance frequency band. ### Claim 6 (depends on 5) The method according to claim 5, wherein that the even multiple of the power frequency is greater than or equal to an upper boundary of the resonance frequency band is specifically: 2kf≥fei+B∀i=1,2, . . . ,M; wherein fei is an ith-order natural frequency of the stator of the permanent magnet motor, f is the power frequency, B is ½ of the resonance bandwidth of the stator of the permanent magnet motor, M is the highest order of the natural frequency of the stator of the permanent magnet motor, and k is a positive integer. ### Claim 7 (depends on 6) The method according to claim 6, wherein M=4. ### Claim 8 (depends on 1) The method according to claim 1, wherein the method further comprises: obtaining a battery cell temperature of the power battery and operating status of the permanent magnet motor; correspondingly, that a power battery meets a self-heating condition comprises: the battery cell temperature is less than a preset temperature threshold, and the operating status is stopped status. ### Claim 9 (depends on 1) The method according to claim 1, wherein the method further comprises: obtaining a duty ratio; correspondingly, the supplying power to the permanent magnet motor by using alternating current at the power frequency specifically comprises: generating a pulse width modulation signal according to the power frequency and the duty ratio, wherein the signal is used to supply the alternating current at the power frequency to the permanent magnet motor with. ### Claim 10 (depends on 1) A power system, comprising: a power battery, an inverter, a permanent magnet motor, and a motor controller, wherein the motor controller is configured to execute the method for controlling a permanent magnet motor according to claim 1. ### Claim 11 (depends on 1) An electric vehicle, comprising a power system, wherein the power system comprises a power battery, an inverter, a permanent magnet motor, and a motor controller, and the motor controller is configured to execute the method for controlling a permanent magnet motor according to claim 1. ### Claim 12 An apparatus for controlling a permanent magnet motor, comprising: an obtaining module, configured to obtain system parameters of the permanent magnet motor, wherein the system parameters comprise: a resonance bandwidth of the permanent magnet motor and a natural frequency of a stator of the permanent magnet motor; a determining module, configured to set a power frequency of the permanent magnet motor according to the system parameters; a control module, configured to supply power to the permanent magnet motor by using alternating current at the power frequency when a power battery meets a self-heating condition; wherein an even multiple of the power frequency is outside a resonance frequency band, and the resonance frequency band is determined according to the natural frequency of the stator and the resonance bandwidth of the permanent magnet motor. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein that an even multiple of the power frequency is outside a resonance frequency band comprises: the even multiple of the power frequency is less than or equal to a lower boundary of the resonance frequency band. ### Claim 14 (depends on 13) The apparatus according to claim 13, wherein that the even multiple of the power frequency is less than or equal to a lower boundary of the resonance frequency band is specifically: 2kf≤fei−B∀i=1,2, . . . ,M; wherein fei is an ith-order natural frequency of the stator of the permanent magnet motor, f is the power frequency, B is ½ of the resonance bandwidth of the stator of the permanent magnet motor, M is the highest order of the natural frequency of the stator of the permanent magnet motor, and k is a positive integer. ### Claim 15 (depends on 14) The apparatus according to claim 14, wherein M=4. ### Claim 16 (depends on 12) The apparatus according to claim 12, wherein that an even multiple of the power frequency is outside a resonance frequency band comprises: the even multiple of the power frequency is greater than or equal to an upper boundary of the resonance frequency band. ### Claim 17 (depends on 16) The apparatus according to claim 16, wherein that the even multiple of the power frequency is greater than or equal to an upper boundary of the resonance frequency band is specifically: 2kf≥fei+B∀i=1,2, . . . ,M; wherein fei is an ith-order natural frequency of the stator of the permanent magnet motor, f is the power frequency, B is ½ of the resonance bandwidth of the stator of the permanent magnet motor, M is the highest order of the natural frequency of the stator of the permanent magnet motor, and k is a positive integer. ### Claim 18 (depends on 17) The apparatus according to claim 17, wherein M=4. ### Claim 19 (depends on 12) The apparatus according to claim 12, wherein the obtaining module is further configured to: obtain a battery cell temperature of the power battery and operating status of the permanent magnet motor; correspondingly, that a power battery meets a self-heating condition comprises: the battery cell temperature is less than a preset temperature threshold, and the operating status is stopped status. ### Claim 20 (depends on 12) The apparatus according to claim 12, wherein the obtaining module is further configured to: obtain a duty ratio; correspondingly, the control module is specifically configured to: generate a pulse width modulation signal according to the power frequency and the duty ratio, wherein the signal is used to supply the alternating current at the power frequency to the permanent magnet motor.