# US 11,309,558 B2 · Control method and system for driving of motor and control method of driving of air compressor of fuel cell system using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,558 B2 - Document ID: US11309558B2 - Status: Granted - Kind: B2 - Application number: 15/796,198 - Filed: 2017-10-27 - Published: 2018-11-15 - Granted: 2022-04-19 - Earliest claimed: 2017-05-10 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Dong Hun Lee; Keun Bong Ham; Chang Seok You; Min Su Kang; Sung Do Kim - Web page: https://patentgrep.com/patent/US11309558B2 ## CPC - H01M 8/04313: characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function - B60L 58/33: by cooling - H01M 8/04201: {Reactant storage and supply, e.g. means for feeding, pipes} - H01M 2250/20: Fuel cells in motive systems, e.g. vehicle, ship, plane - Y02E 60/50: Fuel cells - Y02T 10/72: Electric energy management in electromobility - Y02T 90/40: Application of hydrogen technology to transportation, e.g. using fuel cells - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - 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 - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A control method and system for driving of a motor and a control method of driving of an air compressor of a fuel cell system using the same include calculating an electrical rotation frequency of a motor, calculating a driving torque frequency of the motor based on the calculated electrical rotation frequency of the motor, and controlling torque of the motor to be repeatedly turned on/off at the calculated driving torque frequency. ## Claims ### Claim 1 A motor driving control method, the method comprising steps of: calculating an electrical rotation frequency of a motor; calculating a driving torque frequency of the motor based on the calculated electrical rotation frequency of the motor; calculating phases of 3-phase current of the motor; calculating a start point for applying driving torque of the motor based on the calculated phases of 3-phase current of the motor; and controlling torque of the motor to be repeatedly turned on/off at the calculated driving torque frequency, wherein the step of calculating a driving torque frequency of the motor comprises calculating the driving torque frequency in synchronization with the calculated electrical rotation frequency of the motor, wherein the step of calculating a driving torque frequency of the motor further comprises determining the driving torque frequency as a multiple of 6/n of the calculated electrical rotation frequency of the motor, where n is a natural number, and wherein the step of calculating a start point for applying driving torque comprises calculating a start point at which any one of 3-phase current of the motor is 0 [A] based on the calculated phases of 3-phase current of the motor and applying the driving torque of the motor based on the calculated start point. ### Claim 2 (depends on 1) The motor according to claim 1, wherein the step of controlling torque of the motor comprises applying driving current supplied to the motor when the torque of the motor is in an on-state and performing control to substantially adjust the driving current supplied to the motor to 0 when the torque of the motor is in an off-state. ### Claim 3 (depends on 2) The motor according to claim 2, wherein the step of controlling torque of the motor further comprises controlling a switching device to be off included in an inverter for applying driving current to the motor when the torque of the motor is in an off-state. ### Claim 4 (depends on 2) The method according to claim 2, wherein the step of controlling torque of the motor further comprises controlling a switching device included in an inverter to be turned on/off such that a driving voltage applied to the motor is substantially the same as counter electromotive force of the motor. ### Claim 5 (depends on 1) The method according to claim 1, wherein the step of controlling torque of the motor comprises applying the driving torque of the motor at the calculated start point for applying the driving torque. ### Claim 6 (depends on 5) The method according to claim 5, wherein the step of calculating a start point for applying driving torque further comprises calculating the start point for applying the driving torque of the motor such that the calculated start point at which any one of the 3-phase current of the motor is 0 [A] is a center of a time period within which the driving torque is on. ### Claim 7 (depends on 1) The method according to claim 1, wherein the step of calculating a driving torque frequency of the motor further comprises determining the driving torque frequency as a multiple of 6/n of the calculated electrical rotation frequency of the motor, where n is a natural number that is not a multiple of 3. ### Claim 8 A motor driving control system comprising a processor including: a motor monitoring device configured to calculate an electrical rotation frequency of the motor; a driving torque frequency calculating device configured to calculate a driving torque frequency for controlling driving torque of the motor to be repeatedly turned on/off based on the electrical rotation frequency calculated by the motor monitoring device; and an inverter controller configured to control the driving torque of the motor to be repeatedly turned on/off at the driving torque frequency of the motor, calculated by the driving torque frequency calculating device, wherein the driving torque frequency calculating device calculates the driving torque frequency in synchronization with the calculated electrical rotation frequency of the motor, wherein the driving torque frequency calculating device determines the driving torque frequency as a multiple of 6/n of the calculated electrical rotation frequency of the motor, where n is a natural number, wherein the processor further includes a driving torque application time calculating device configured to calculate phases of 3-phase current of the motor and calculate a start point at which any one of 3-phase current of the motor is 0 [A] based on the calculated phases of 3-phase current of the motor, and wherein the inverter controller applies the driving torque of the motor based on the calculated start point. ### Claim 9 (depends on 8) The motor driving control system according to claim 8, wherein the inverter controller applies the driving torque at the calculated start point for applying the driving torque. ### Claim 10 A motor driving control method of an air compressor of a fuel cell system, for supplying compressed air to a fuel cell stack, the method comprising steps of: calculating an electrical rotation frequency of a motor; calculating a driving torque frequency of the motor based on the calculated electrical rotation frequency of the motor; calculating phases of 3-phase current of the motor; calculating a start point for applying driving torque of the motor based on the calculated phases of 3-phase current of the motor; and controlling torque of the motor to be repeatedly turned on/off at the calculated driving torque frequency, wherein the step of calculating a driving torque frequency of the motor comprises calculating the driving torque frequency in synchronization with the calculated electrical rotation frequency of the motor, wherein the step of calculating a driving torque frequency of the motor further comprises determining the driving torque frequency as a multiple of 6/n of the calculated electrical rotation frequency of the motor, where n is a natural number, and wherein the step of calculating a start point for applying driving torque comprises calculating a start point at which any one of 3-phase current of the motor is 0 [A] based on the calculated phases of 3-phase current of the motor and applying the driving torque of the motor based on the calculated start point. ### Claim 11 (depends on 10) The method according to claim 10, wherein the step of controlling torque of the motor comprises applying the driving torque of the motor at the calculated start point for applying of the driving torque.