Electric motor driving apparatus, control method, vehicle, and readable storage medium

Patent metadata

Field	Value
Publication number	US-2025141389-A1
Application number	US-202519009475-A
Country	US
Kind code	A1
Filing date	Jan 3, 2025
Priority date	Dec 21, 2018
Publication date	May 1, 2025
Grant date	—

Abstract

A motor drive apparatus includes a three-phase inverter and a three-phase motor. A first terminal of the three-phase inverter is connected to a positive electrode of a power battery. A second terminal of the three-phase inverter is connected to a negative electrode of the power battery Three phase coils of the three-phase motor are respectively connected to midpoints of three phase legs of the three-phase inverter. The motor drive apparatus is configured to simultaneously control (i) a process of charging the power battery by a power supply module, (ii) a torque of the three-phase motor at a zero output, and (iii) the three-phase inverter and the three-phase motor to heat a heat exchange medium flowing through at least one of the three-phase inverter or the three-phase motor.

First claim

What is claimed is:

1 . A method for controlling motor drive, applicable to a motor drive apparatus, the method comprising:
(i) charging a power battery by a power supply module, (ii) adjusting a torque of a three-phase motor of the motor drive apparatus at a zero output, and (iii) adjusting a three-phase inverter of the motor drive apparatus and the three-phase motor to heat a heat exchange medium flowing through at least one of the three-phase inverter or the three-phase motor.

2 . The method of claim 1 , wherein
a first terminal of the three-phase inverter is connected to a positive electrode of the power battery, a second terminal of the three-phase inverter is connected to a negative electrode of the power battery, and three phase coils of the three-phase motor are respectively connected to midpoints of three phase legs of the three-phase inverter, and the motor drive apparatus is configured to simultaneously control (i), (ii), and (iii).

3 . The method of claim 1 , wherein the motor drive apparatus further comprises a capacitor, wherein a first terminal of the capacitor is connected to a positive electrode of the power battery, a second terminal of the capacitor is connected to a negative electrode of the power battery, and the power battery is connected to a controller by the capacitor.

4 . The method of claim 1 , wherein the motor drive apparatus further comprises an inductor and a buck side capacitor, and the inductor is connected between three phase coils of the three-phase motor and a first terminal of the buck side capacitor.

5 . The method of claim 1 , further comprising:
obtaining a required heating power and a required charging power; and adjusting a current value and direction of each phase current of the three-phase motor based on the required heating power, the required charging power, and an output of the three-phase motor at a zero torque.

6 . The method of claim 4 , further comprising:
obtaining a required heating power and a required charging power; obtaining a target input current of the three-phase motor and a first target duty cycle of a control pulse of each of three phase legs based on the required heating power, the required charging power, and an output of the three-phase motor at a zero torque; and receiving an input current of the power supply module based on the target input current, and controlling each of the three phase legs based on the first target duty cycle.

7 . The method of claim 6 , wherein the obtaining a target input current of the three-phase motor and a first target duty cycle of a control pulse of each of three phase legs based on the required heating power, the required charging power, and an output of the three-phase motor at a zero torque comprises:
obtaining a target voltage of the buck side capacitor; and calculating the target input current of the three-phase motor based on the required heating power, the required charging power, the output of the three-phase motor at a zero torque, and the target voltage.

8 . The method of claim 7 , wherein the obtaining a target input current of the three-phase motor and a first target duty cycle of a control pulse of each of three phase legs based on the required heating power, the required charging power, and an output of the three-phase motor at a zero torque further comprises:
obtaining a target current of each phase current of the three-phase motor based on a location of a motor rotor, the required heating power, the target input current, and the output of the three-phase motor at a zero torque; and obtaining the first target duty cycle of the control pulse of each of three phase legs based on the target current of each phase current, the target input current, the target voltage of the buck side capacitor, and a voltage of the power battery.

9 . The method of claim 8 , wherein the obtaining a target current of each phase current based on a location of a motor rotor, the required heating power, the target input current, and the output of the three-phase motor at a zero torque comprises:
calculating a target current of each phase current of the three-phase motor based on the required heating power, the location of the motor rotor, and the output of the three-phase motor at a zero torque by using formula 1, formula 2, and formula 3:

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Assignees

• Byd Co Ltd

Inventors

• Lian Yubo
• Ling Heping
• Pan Hua
• Xie Feiyue
• Zhang Lijun

Classifications

• H02J7/855

  with circuits adapted for supplying loads from the battery · CPC title

• H02P29/62 Primary

  for raising the temperature of the motor · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title