# US 10,479,219 B2 · Controller for AC electric motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,219 B2 - Document ID: US10479219B2 - Status: Granted - Kind: B2 - Application number: 16/043,906 - Filed: 2018-07-24 - Published: 2019-03-21 - Granted: 2019-11-19 - Earliest claimed: 2017-09-21 - Assignees: Fuji Electric Co., Ltd. - Applicants: Fuji Electric Co., Ltd. - Inventors: Hirokazu Tajima - Web page: https://patentgrep.com/patent/US10479219B2 ## CPC - B60L 50/51: characterised by AC-motors - H02P 21/05: specially adapted for damping motor oscillations, e.g. for reducing hunting - B60W 10/08: including control of electric propulsion units, e.g. motors or generators - H02P 21/18: Estimation of position or speed - B60L 2200/26: Rail vehicles - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - 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 - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A controller for an AC electric motor includes an acquirer that acquires at least one of a frequency of an output voltage of a power converter and an estimated value of a rotational speed of the AC electric motor, and a frequency component remover that removes a predetermined frequency component from an acquired value by feedforward control, using the acquired value acquired by the acquirer as an input value. ## Claims ### Claim 1 A controller for an AC electric motor that controls driving of the AC electric motor based on a voltage command value set based on one of a torque command value and a speed command value for driving the AC electric motor and a current detection value at which a current that flows to the AC electric motor during the driving of the AC electric motor is detected, comprising: a power converter that drives the AC electric motor; an acquirer that acquires at least one of a frequency of an output voltage of the power converter and an estimated value of a rotational speed of the AC electric motor based on the voltage command value and the current detection value; and a frequency component remover for performing feedforward control so that a predetermined frequency component is removed from an acquired value acquired by the acquirer as an input value. ### Claim 2 (depends on 1) The controller for the AC electric motor according to claim 1, further comprising a parameter calculator into which information based on the acquired value is input and that acquires, based on the input information, a parameter for the frequency component remover to remove the predetermined frequency component, wherein the frequency component remover performs the feedforward control to remove the predetermined frequency component from the acquired value, based on the acquired value and the parameter acquired by the parameter calculator as input values. ### Claim 3 (depends on 2) The controller for the AC electric motor according to claim 2, further comprising a limiter that limits a range of the acquired value acquired by the acquirer where the parameter calculator acquires the parameter. ### Claim 4 (depends on 1) The controller for the AC electric motor according to claim 1, wherein the frequency component remover removes a plurality of frequency components in descending order of frequencies to be removed when removing the plurality of frequency components different from each other. ### Claim 5 (depends on 4) The controller for the AC electric motor according to claim 4, further comprising a parameter calculator into which information based on the acquired value is input and that acquires, based on the input information, a parameter for the frequency component remover to remove the predetermined frequency component, wherein the frequency component remover removes each of the plurality of frequency components by the feedforward control, based on the parameter acquired by the parameter calculator with the information for a first frequency component removal in removals of the plurality of frequency components, as the input value. ### Claim 6 (depends on 4) The controller for the AC electric motor according to claim 4, further comprising a parameter calculator into which information based on the acquired value is input and that acquires, based on the input information, a parameter for the frequency component remover to remove the predetermined frequency component, wherein the frequency component remover removes a first frequency component by the feedforward control, based on the parameter acquired by the parameter calculator based on first information based on the acquired value as the input value, and removes a second frequency component different from the first frequency component by the feedforward control, based on the parameter acquired by the parameter calculator based on second information based on the acquired value from which the first frequency component has been removed as the input value. ### Claim 7 (depends on 1) The controller for the AC electric motor according to claim 1, wherein the frequency component remover removes a plurality of frequency components in order from a frequency of a larger ripple generated in the acquired value when removing the plurality of frequency components different from each other. ### Claim 8 A controller for an AC electric motor that controls driving of the AC electric motor based on a voltage command value set based on one of a torque command value and a speed command value for driving the AC electric motor and a current detection value at which a current that flows to the AC electric motor during the driving of the AC electric motor is detected, comprising: a control unit; and a power converter that drives the AC electric motor, wherein the control unit acquires at least one of a frequency of an output voltage of the power converter and an estimated value of a rotational speed of the AC electric motor based on the voltage command value and the current detection value, and removes a predetermined frequency component from an acquired value by feedforward control based on the acquired value. ### Claim 9 (depends on 8) The controller for the AC electric motor according to claim 8, wherein the control unit acquires a parameter for removal of the predetermined frequency component based on information based on the acquired value, and removes the predetermined frequency component from the acquired value by the feedforward control based on the acquired value and the acquired parameter. ### Claim 10 (depends on 9) The controller for the AC electric motor according to claim 9, wherein the control unit limits a range of the acquired value for acquiring the parameter.