# US 2025/0158554 A1 · Motor control device, hybrid system, mechanically and electrically integrated unit, and electric vehicle system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0158554 A1 - Document ID: US20250158554A1 - Status: Published application - Kind: A1 - Application number: 18/832,967 - Filed: 2023-04-21 - Published: 2025-05-15 - Earliest claimed: 2022-05-18 - Assignees: Hitachi Astemo, Ltd. - Applicants: Hitachi Astemo, Ltd. - Inventors: Takafumi HARA; Takaya TSUKAGOSHI; Shigehisa AOYAGI; Hideki MIYAZAKI - Web page: https://patentgrep.com/patent/US20250158554A1 ## CPC - H02P 21/05: specially adapted for damping motor oscillations, e.g. for reducing hunting - H02P 27/12: pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control - B60L 15/025: {using field orientation; Vector control; Direct Torque Control [DTC]} - B60L 50/16: with provision for separate direct mechanical propulsion - H02P 21/22: Current control, e.g. using a current control loop - 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 2207/05: Synchronous machines, e.g. with permanent magnets or DC excitation - 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 ## Abstract This motor control device is connected to an inverter for converting DC power to AC power to output the AC power to a motor and controls the operation of the inverter in accordance with a torque command, thereby controlling the drive of the motor using the inverter. The motor control device comprises: a carrier wave generation unit that generates a carrier wave; a carrier frequency adjustment unit that adjusts a carrier frequency that is the frequency of the carrier wave; and a PWM control unit that performs pulse width modulation on a voltage command using the carrier wave and generates a PWM pulse signal for controlling the operation of the inverter. The carrier frequency adjustment unit adjusts the carrier frequency so that the carrier frequency when the motor performs entrainment drive becomes higher than the carrier frequency when the motor does not perform the entrainment drive. ## Claims ### Claim 1 A motor control device connected to an inverter that converts DC power into AC power and that outputs the AC power to a motor, the motor control device controlling operation of the inverter according to a torque instruction, thereby controlling drive of the motor, using the inverter, the motor control device comprising: a carrier wave generation unit that generates a carrier wave; a carrier frequency adjustment unit that adjusts a carrier frequency that is a frequency of the carrier wave; and a PWM control unit that performs pulse width modulation of a voltage instruction, using the carrier wave, to generate a PWM pulse signal for controlling operation of the inverter, wherein the carrier frequency adjustment unit adjusts the carrier frequency so that the carrier frequency in a case where the motor is in a state of co-rotation drive becomes higher than the carrier frequency in a case where the motor is not in the state of co-rotation drive. ### Claim 2 (depends on 1) The motor control device according to claim 1, wherein the carrier frequency adjustment unit compares an absolute value of the torque instruction with a given threshold, and when the absolute value of the torque instruction is equal to or smaller than the threshold, determines that the motor is in a state of co-rotation drive. ### Claim 3 (depends on 2) The motor control device according to claim 2, wherein the threshold is determined based on a result of an electromagnetic field analysis simulation or an experiment conducted in advance. ### Claim 4 (depends on 2) The motor control device according to claim 2, wherein when the absolute value of the torque instruction is equal to or smaller than the threshold, the motor control device stops outputting the PWM pulse signal to the inverter. ### Claim 5 (depends on 2) The motor control device according to claim 2, wherein when the absolute value of the torque instruction is equal to or smaller than the threshold, the motor control device disconnects the inverter from the motor. ### Claim 6 (depends on 1) The motor control device according to claim 1, wherein the carrier frequency in a case where the motor is in a state of co-rotation drive is determined based on at least either a process load of the motor control device or a capacity of a gate power supply that supplies power to a gate drive circuit included in the inverter. ### Claim 7 (depends on 1) The motor control device according to claim 1, wherein the motor control device controls drive of the motor so that an induced voltage generated by rotation of the motor is smaller than a withstand voltage of a switching element of the inverter. ### Claim 8 (depends on 1) The motor control device according to claim 1, comprising a current control unit that calculates the voltage instruction in every given calculation cycle, wherein the carrier frequency adjustment unit adjusts the carrier frequency in a case where the motor is in a state of co-rotation drive such that the calculation cycle is longer than half of a cycle of the carrier wave. ### Claim 9 (depends on 1) The motor control device according to claim 1, wherein the carrier frequency adjustment unit adjusts the carrier frequency so that a rate of change of the carrier frequency is equal to or smaller than a given value. ### Claim 10 (depends on 1) The motor control device according to claim 1, comprising: a current instruction generation unit that generates a current instruction based on the torque instruction; a current control unit that calculates the voltage instruction, based on the current instruction; and an instruction correction unit that corrects the current instruction or the voltage instruction so that a harmonic component of a specific order is superimposed on a current flowing through the motor, wherein the PWM control unit carries out weak field control by which the PWM pulse signal is generated in such a way as to weaken magnetic flux of the motor, when the motor is in a state of co-rotation drive and the PWM control unit is carrying out the weak field control, the instruction correction unit corrects the current instruction or the voltage instruction, and when the PWM control unit is not carrying out the weak field control, the carrier frequency adjustment unit adjusts the carrier frequency so that the carrier frequency in a case where the motor is in the state of co-rotation drive becomes higher than the carrier frequency in a case where the motor is not in the state of co-rotation drive. ### Claim 11 (depends on 10) The motor control device according to claim 10, wherein the specific order is an order of a multiple of 6 in terms of an electrical angle. ### Claim 12 A motor control device connected to an inverter that converts DC power into AC power and that outputs the AC power to a motor, the motor control device controlling operation of the inverter according to a torque instruction, thereby controlling drive of the motor, using the inverter, wherein when an absolute value of the torque instruction is equal to or smaller than a given threshold, the motor control device generates a PWM pulse signal for controlling operation of the inverter so that harmonic pulsation of a gap magnetic flux density between a stator and a rotor of the motor is suppressed. ### Claim 13 (depends on 1) A hybrid system comprising: the motor control device according to claim 1; the inverter connected to the motor control device; the motor driven by the inverter; and an engine system connected to the motor. ### Claim 14 (depends on 1) A mechanically and electrically integrated unit comprising: the motor control device according to claim 1; the inverter connected to the motor control device; the motor driven by the inverter; and a gear that transmits a rotational driving force of the motor, wherein the motor, the inverter, and the gear are put together into an integrated structure. ### Claim 15 (depends on 1) An electric vehicle system comprising: the motor control device according to claim 1; the inverter connected to the motor control device; and the motor driven by the inverter, wherein the electric vehicle system travels by using a rotational driving force of the motor.