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Motor short-circuit protection method and device

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

Active Publication Date: 2019-07-12
GUANGZHOU XIAOPENG MOTORS TECH CO LTD
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  • 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

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  • Motor short-circuit protection method and device

Examples

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Effect test

Embodiment 1

[0075] See figure 1 , figure 1 It is a schematic flowchart of a method for short-circuit protection of a motor 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 capacitor voltage in the motor controller of the vehicle exceeds a preset voltage threshold; if it exceeds, execute step 102; if it does not exceed, end this process.

[0077] In the embodiment of the present invention, the capacitor may include, but is not limited to: a DC_LINK capacitor, that is, a DC support capacitor, which belongs to a type of passive device. It has high voltage resistance, large current resistance, low impedance, low inductance, small capacity loss, and leakage. Low current, good temperature performance, fast charge and discharge speed, long service life (about 100,000 hours), safety explosion-proof and convenient non-polar...

Embodiment 2

[0104] See figure 2 , figure 2 It is a schematic flow chart of another short-circuit protection method for a motor disclosed in an 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 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 solution for short-circuit protection of the vehicle motor under various working conditions; the embodiment of the present invention does not limit it.

[0106] 201. When the motor short-circuit protection device detects that the vehicle is charging, it determines whether the ...

Embodiment 3

[0114] See image 3 , image 3 It is a schematic structural 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 determining unit 302 is configured to determine whether the motor speed of the vehicle is less than or equal to the preset speed threshold when the first detecting 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 prohibit the active short circuit protection scheme when the first judgment unit 302 judges that the motor speed of the vehicle is less than or equal to the p...

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Abstract

The embodiment of the invention relates to the technical field of overvoltage protection, and discloses a motor short-circuit protection method and device. The method comprises the steps of: detectinga voltage of a capacitor in a motor controller of a vehicle exceeds a preset voltage threshold value or not, if yes, determining the rotation speed of the motor of the vehicle is smaller than or equal to a preset rotation speed threshold value, and if yes, controlling a power device in the motor controller to forbid tube opening and forbid starting of an active short-circuit protection scheme. According to the embodiment of the invention, the probability of failure or even damage of the power device or the motor controller can be reduced.

Description

Technical field [0001] The present invention relates to the technical field of overvoltage protection, in particular to a method and device for short-circuit protection of a motor. Background technique [0002] When the vehicle turns off the main relay of the vehicle motor in a faulty state, the voltage on the capacitor in the motor controller may rise rapidly due to the back EMF of the vehicle motor or the short-term charging of the charger, which may cause the motor controller Power devices (for example: Insulated Gate Bipolar Transistor, IGBT) damage, and even affect the safety of the vehicle. At present, the following active short-circuit protection schemes are generally adopted to avoid the above-mentioned risks: when it is detected that the voltage on the capacitor in the motor controller exceeds a preset threshold, the three upper bridges in the IGBT in the motor controller are controlled Or the three lower bridges are opened to short-circuit the motor windings, so that t...

Claims

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Application Information

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IPC IPC(8): H02H7/08
CPCH02H7/0833H02H7/0844
Inventor 余冲
Owner GUANGZHOU XIAOPENG MOTORS TECH CO LTD
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