# US 2021/0276430 A1 · Apparatus and method for influencing electromagnetic forces of an electric traction motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0276430 A1 - Document ID: US20210276430A1 - Status: Published application - Kind: A1 - Application number: 17/173,235 - Filed: 2021-02-11 - Published: 2021-09-09 - Earliest claimed: 2020-03-03 - Assignees: Dr. Ing. h.c. F. Porsche Aktiengesellschaft - Applicants: Dr. Ing. h.c. F. Porsche Aktiengesellschaft - Inventors: Maximilian Barkow; Robert Nelles; Hugo Kock; Jan Naegelkraemer - Web page: https://patentgrep.com/patent/US20210276430A1 ## CPC - 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 - H02P 21/05: specially adapted for damping motor oscillations, e.g. for reducing hunting - B60L 2240/421: Speed - B60L 2240/423: Torque - B60L 2240/425: Temperature - B60L 2240/427: Voltage - B60L 2240/429: Current - B60L 2270/147: electro magnetic [EMI] - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/72: Electric energy management in electromobility - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An apparatus and a method for influencing electromagnetic forces of an electric traction motor, a higher-order harmonic (336) being superimposed on an actuating variable (udq) for the electric traction motor in a manner which is dependent on a rotational speed of the electric traction motor, a torque of the electric traction motor, a temperature at the electric traction motor, or a three-phase current or a three-phase voltage of the electric traction motor for the generation of a resulting actuating variable (uabc), the electric traction motor being actuated in a manner which is dependent on the resulting actuating variable (uabc), and the actuating variable (udq), the harmonic (336) and the resulting actuating variable (uabc) characterizing an actuating current or an actuating voltage. ## Claims ### Claim 1 A method for influencing electromagnetic forces of an electric traction motor, comprising: superimposing a higher-order harmonic on an actuating variable for the electric traction motor in a manner that is dependent on a rotational speed of the electric traction motor, a torque of the electric traction motor, a temperature at the electric traction motor, or a three-phase current or a three-phase voltage of the electric traction motor for generating a resulting actuating variable, actuating the electric traction motor in a manner dependent on the resulting actuating variable, and the actuating variable, the harmonic and the resulting actuating variable characterizing an actuating current or an actuating voltage. ### Claim 2 (depends on 1) The method of claim 1, wherein the harmonic has a frequency that is an integral multiple of a frequency of the fundamental oscillation of the actuating variable of the actuating current or the actuating voltage. ### Claim 3 (depends on 1) The method of claim 1, wherein the harmonic is determined in a manner that is dependent on at least one characteristic diagram that assigns an amplitude, a phase and/or a pilot control angle to the rotational speed, the torque and/or the temperature for a determination of the harmonic. ### Claim 4 (depends on 1) The method of claim 1, wherein the harmonic is determined in a manner that is dependent on a characteristic diagram that assigns an amplitude, a phase and/or a pilot control angle to the three-phase current or the three-phase voltage, the temperature and/or the rotational speed for a determination of the harmonic. ### Claim 5 (depends on 1) The method of claim 1, wherein the determination of the amplitude, the phase, and/or the pilot control angle for the harmonic takes place in a first task, the generation of the harmonic taking place in a second task. ### Claim 6 (depends on 5) The method of claim 5, wherein the first task is slower than the second task. ### Claim 7 (depends on 1) The method of claim 1, wherein a magnitude of the order of the harmonic is determined in a manner dependent on a number of pole pairs of the traction motor. ### Claim 8 (depends on 1) The method of claim 1, wherein the resulting actuating variable is determined in a manner which is dependent on the torque and the rotational speed. ### Claim 9 (depends on 1) The method of claim 1, wherein the actuating variable is determined in a manner dependent on at least one input current that is filtered by way of a filter that can be deactivated. ### Claim 10 (depends on 1) The method of claim 1, wherein the amplitude, the phase, and/or the pilot control angle for the harmonic are limited by way of a limiter. ### Claim 11 (depends on 1) The method as claimed of claim 1, wherein plural harmonics of differing order are generated and are superimposed for the generation of the resulting actuating variable. ### Claim 12 (depends on 1) An apparatus for influencing electromagnetic forces of an electric traction motor, comprising a controller configured to actuate the electric traction motor in accordance with the method of claim 1.