Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for short-circuit protection of a motor

A technology of short-circuit protection and motor speed, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of motor controller failure, damage, motor controller power device failure, etc., to reduce the probability of power device damage, high resistance voltage effect

Active Publication Date: 2021-09-03
GUANGZHOU XIAOPENG MOTORS TECH CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In practice, it has been found that if the specific working conditions of the vehicle are not distinguished, the above-mentioned active short-circuit protection scheme will be blindly activated as soon as a fault occurs. Since the back electromotive force injected by the vehicle motor all acts on the three upper bridges or three lower bridges in the IGBT, It may lead to the failure or even damage of the power device in the motor controller; moreover, there will be a large transient current at the moment of short circuit of the motor winding, which may cause the magnetic steel of the motor to demagnetize, thereby causing the motor controller to fail or even be damaged
[0004] It can be seen that blindly enabling the above-mentioned active short-circuit protection scheme may cause power devices or motor controllers to fail or even be damaged

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for short-circuit protection of a motor
  • Method and device for short-circuit protection of a motor
  • Method and device for short-circuit protection of a motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] see figure 1 , figure 1 It is a schematic flowchart of a motor short-circuit protection method disclosed in an embodiment of the present invention. Such as figure 1 As shown, the motor short circuit protection method may include the following steps:

[0076] 101. The motor short-circuit protection device detects whether the voltage of the capacitor in the motor controller of the vehicle exceeds a preset voltage threshold; if so, execute step 102; if not, end this process.

[0077] In the embodiment of the present invention, capacitors may include but are not limited to: DC_LINK capacitors, that is, DC support capacitors, which are a type of passive devices, and have high withstand voltage, large current resistance, low impedance, low inductance, small capacity loss, leakage Small current, good temperature performance, fast charging and discharging speed, long service life (about 100,000 hours), safe explosion-proof and non-polarity, easy installation and so on. Wide...

Embodiment 2

[0104] see figure 2 , figure 2 It is a schematic flowchart of another motor short-circuit protection method disclosed in the embodiment of the present invention. Such as figure 2 As shown, the motor short circuit protection method may include the following steps:

[0105] It should be noted that: in the embodiment of the present invention, the following steps 201 to 203 can be implemented independently to form an independent motor short-circuit protection method, which is used for short-circuit protection of the vehicle motor when the vehicle is charging; in addition, The following steps 201 to 203 can also be implemented in conjunction with a motor short-circuit protection method disclosed in Embodiment 1 to form a short-circuit protection scheme for vehicle motors under various working conditions; this embodiment of the present invention is not limited thereto.

[0106] 201. When the motor short-circuit protection device detects that the vehicle is being charged, it de...

Embodiment 3

[0114] see image 3 , image 3 It is a structural schematic diagram of a motor short-circuit protection device disclosed in an embodiment of the present invention. Such as image 3 As shown, the motor short circuit protection device may include:

[0115] The first detection unit 301 is used to detect whether the capacitor voltage in the motor controller of the vehicle exceeds a preset voltage threshold;

[0116] The first judging unit 302 is configured to judge whether the motor speed of the vehicle is less than or equal to the preset speed threshold when the first detection unit 301 detects that the capacitor voltage in the motor controller of the vehicle exceeds a preset voltage threshold;

[0117] The first control unit 303 is configured to control the power device in the motor controller to prohibit switching on and to prohibit activation of the active short circuit protection scheme when the first judging unit 302 judges that the motor speed of the vehicle is less than...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The embodiment of the present invention relates to the technical field of overvoltage protection, and discloses a motor short-circuit protection method and device, including: detecting whether the capacitor voltage in the motor controller of the vehicle exceeds a preset voltage threshold; if exceeding, judging the motor speed of the vehicle Whether it is less than or equal to the preset speed threshold; if the motor speed of the vehicle is less than or equal to the preset speed threshold, control the power device in the motor controller to prohibit switching on, and prohibit the activation of the active short circuit protection scheme. Implementing the embodiments of the present invention can reduce the probability of failure or even damage of a power device or a motor controller.

Description

technical field [0001] The invention relates to the technical field of overvoltage protection, in particular to a motor short circuit protection method and device. Background technique [0002] When the vehicle disconnects the main relay of the vehicle motor in the state of failure, the voltage on the capacitor in the motor controller may rise rapidly due to the reverse electromotive force of the vehicle motor or the short-term charging of the charger, which may lead to a breakdown in the motor controller. Power devices (for example: Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor, IGBT) are damaged, and even affect the safety of the vehicle. At present, the above-mentioned risks are generally avoided by the following active short-circuit protection scheme: when it is detected that the voltage on the capacitor in the motor controller exceeds a preset threshold, control the three upper bridges in the IGBT in the motor controller Or the three lower bridge...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
CPCH02H7/0833H02H7/0844
Inventor 余冲
Owner GUANGZHOU XIAOPENG MOTORS TECH CO LTD