Granted Patent B2

US 12,237,794 · App. 18/097,191 · Granted Feb 25, 2025

Inventors: Xiaosan Xu (Zhongshan, CN); Hairong Sun (Zhongshan, CN); Wei Lei (Zhongshan, CN); Jie Zhang (Zhongshan, CN)

Assignee: ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD.

H02P29/60H02H7/0852H02H7/0811

Abstract

Claims (19)

1. A method for protecting a motor from overheating, the method comprising:

1) running the motor in a given parameter P and detecting a real-time temperature R of the motor;

2) comparing the real-time temperature R with a plurality of set temperatures, the plurality of set temperatures comprising an overheating protection temperature Rm, a shutdown temperature Rmax and a recovery operation temperature Rmin, and Rmin<Rm<Rmax;

3) according to a comparison result in 2), controlling the motor to operate at an initial current value I 0 , or operate in a reduced current value with respect to the initial current value I 0 , or stop running; and

4) when the real-time temperature R meets the condition: Rm<R<Rmax, running the motor in an overheating protection mode, where the motor operates at a current value I lower than the initial current value I 0 , and the current value I decreases with an increase of the real-time temperature R; and in the overheating protection mode, when the real-time temperature R begins to decrease, the current value I no longer decreases and the motor continues to operate at the current value I; when the real-time temperature R decreases to the recovery operation temperature Rmin, the motor quits the overheating protection mode, the current value recovers to the initial current value I 0 , and the motor runs under the given parameter P.

2. The method of claim 1 , wherein in the overheating protection mode, the current value I varies with the increase of the real-time temperature R according to the following equation: I=I 0 (1−((R−Rm)/K)), where K is a proportional constant in the range between 1.5×(Rmax−Rm) and 2×(Rmax−Rm).

3. The method of claim 2 , wherein in the overheating protection mode, the current value I is updated every a set interval T according to the real-time temperature R of the motor; when a temperature R 0 corresponding to a last updated current value I is larger than an immediate real-time temperature R, and R 0 −R>A, where A is a set constant, which means the motor enters a cooling state, and the motor continues operation at the last updated current value I corresponding to the temperature R 0 of the motor.

4. The method of claim 3 , wherein when the real-time temperature R meets the condition: Rmin<R<Rm, a working mode of the motor is determined; when the motor runs in an overheating protection mode, the current value of the motor continues decreasing; when the motor runs in a shutdown model, the motor stops running until the real-time temperature R decreases to the recovery operation temperature Rmin, and the motor restarts.

5. The method of claim 4 , wherein when the real-time temperature R is greater than or equal to the shutdown temperature Rmax, the motor enters the shutdown model and stops running.

6. The method of claim 5 , wherein when the motor stops running, the motor cools down continuously with the time passing by, and the real-time temperature R of the motor decreases continuously, until to the recovery operation temperature Rmin, the current value recovers to the initial current value I 0 , and the motor restarts to run under the given parameter P.

7. The method of claim 1 , wherein at initial startup, when the real-time temperature R is less than the overheating protection temperature Rm, the motor operates normally with the initial current value I 0 .

8. The method of claim 1 , wherein:

1) When the motor starts, if the real-time temperature is R<Rmin or R<Rm, the motor runs in the initial current value I 0 ;

2) During running, if the real-time temperature is Rm<R<Rmax, the motor enters the overheating protection mode, and runs in a current value I lower than the initial current value I 0 , and the current value I decreases with the increase of the real-time temperature R;

3) during running, if the real-time temperature is R>Rmax, the motor stops running until the real-time temperature R decreases to the recovery operation temperature Rmin, and the motor restarts running under the initial current value I 0 in the given parameter P;

4) During running, if the real-time temperature is Rmin<R<Rm, determining whether the motor runs in an overheating protection mode, if so, the current value continues decrease, if not, to proceed 5); and

5) Determining whether the motor is in a shutdown model, if so, allowing the motor to continue resting until the real-time temperature R decreases to the recovery operation temperature Rmin, and then the motor restarts; if not, allowing the motor to run in the initial current value I 0 .

9. The method of claim 1 , wherein the given parameter P is speed or torque or power.

10. The method of claim 1 , wherein the motor comprises a motor body, a motor controller, and a temperature detection unit; the motor body comprises a stator assembly and a rotor assembly; the motor controller comprises a control circuit board; the control circuit board comprises a power supply circuit, a motor microprocessor MCU, and an inverter circuit; the power supply circuit supplies power for all circuits, and the motor microprocessor MCU controls the inverter circuit; the inverter circuit controls power on and power off of a coil winding of each phase of the stator assembly thus controlling the motor body; the temperature detection unit is used to detect the real-time temperature R inside the motor body and transmit a detection result to the motor microprocessor MCU; the motor microprocessor MCU compares the real-time temperature R with the plurality of set temperatures so that the motor determines to operate normally with the initial current value I 0 , or operate in a reduced current value with respect to the initial current value I 0 , or stop running according to the comparison result.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (15)