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Motor stalling protection system and method, and electric vehicle

A protection system and protection switching technology, applied in electric vehicles, electrical devices, control drives, etc., can solve problems such as loss of load of the traction motor tested by the dynamometer, stall of the traction motor, affecting system safety, etc., to ensure fast response. Stall condition, reduce speed, avoid the effect of back EMF

Active Publication Date: 2012-03-14
SHENZHEN HANGSHENG ELECTRONICS
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AI Technical Summary

Problems solved by technology

At present, this kind of situation is often encountered in the traction motor bench test. The abnormal protection of the dynamometer causes the traction motor under test to lose its load instantly. After the balance of the system is broken, the traction motor rotates rapidly under the drive of electromagnetic torque. increase, which poses a great threat to system security; on the other hand, when the driving wheels of the electric vehicle slip or hang in the air, the traction motor will also experience the same stall phenomenon
At present, the general practice is to cut off the power supply in an emergency or the traction motor enters the overspeed protection to cut off the power. Since the traction motor is a large inductive load, in the case of emergency power cut off, according to the formula U=L*di / dt, the system internal Will generate a large reverse electromotive force, which will affect the safety of the system

Method used

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  • Motor stalling protection system and method, and electric vehicle
  • Motor stalling protection system and method, and electric vehicle
  • Motor stalling protection system and method, and electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, this example provides a motor stall protection system, including: a stall signal generation module, a motor controller module, a vehicle controller module, a power supply module, a traction motor and a load; the stall signal generation module, a power supply module and a complete The car controller module is respectively connected with the motor controller module, the motor controller module controls the traction motor to drive the load, and the stall signal generating module is used to generate a stall signal; the motor controller module presets a threshold value and detect the speed signal, when the speed exceeds the threshold value or a stall signal is detected, it is adjusted to a stall state, and the speed is reduced until the speed is zero and there is no stall signal.

[0037] Wherein, the threshold value is a preset specific value, which is used as a value for judging whether the rotational speed exceeds the safe range per unit time. F...

Embodiment 2

[0044] Such as Figure 4 As shown, different from Embodiment 1, the stall signal generation module described in this example uses a stall protection switch to generate a stall signal.

[0045] Wherein, the threshold value is preset by software threshold, and the corresponding threshold value can be set according to different traction motors; the stall signal generation module generates the stall signal by using a stall protection switch, and the stall protection The switch is used to trigger and generate a stall signal when the speed changes too fast, and enter the stall mode. When the stall protection switch is pressed, a stall signal is generated. The stall signal is a hardware signal. Normal state, that is, it is low level before it is pressed, and it is high level when it is pressed.

[0046] This example includes: a stall signal generation module, a motor controller module, a vehicle controller module, a power supply module, a traction motor and a load; The modules are ...

Embodiment 3

[0049] This example provides a motor protection method of the motor stall protection system described in Embodiment 1, including a speed detection step, a judgment step and a state adjustment step;

[0050] The detection step is used to detect the rotational speed signal;

[0051] The judging step is used to judge whether the speed exceeds a preset threshold value or whether a stall signal is detected, until the speed exceeds a preset threshold value or a stall signal is detected, then enter the state adjustment step;

[0052] The state adjustment step is used to adjust the working state to the stall state, and start the reduction of the speed until the speed is zero and there is no stall signal.

[0053] The motor controller module described in this example enters the idle mode after being powered on. Under the control of the vehicle controller module, the motor controller module receives a mode request and enters the torque mode, and outputs a control torque; the mode reques...

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Abstract

The invention provides a motor stalling protection system and method, and an electric vehicle. The motor stalling protection system comprises a stalling signal generation module, a motor controller module, an integral controller module, a power supply module, a traction motor and a load, wherein the stalling signal generation module, the power supply module and the integral controller module are respectively connected with the motor controller module, the motor controller module controls the traction motor to drive the load, the stalling signal generation module is used for generating a stalling signal; and the motor controller module is used for presetting a threshold and detecting a rotating speed signal, regulating the state to be a stalling state when the rotating speed exceeds the threshold or detecting the stalling signal, and reducing the rotating speed until the rotating speed is zero and no stalling signal exists. The motor stalling protection system achieves dual motor stalling protection from software and hardware, directly enters a stalling mode under an emergence condition, and ensures that the stalling state is rapidly and safely responded.

Description

technical field [0001] The invention relates to a motor protection system, in particular to a motor stall protection system, method and electric vehicle. Background technique [0002] The traction motor is an important source of power for electric vehicles, and the traction motor is the only source of power for EV pure electric vehicles, and it is also an important source of auxiliary power for HEV hybrid vehicles. Therefore, the reliability of traction motor control Safety directly determines the controllability and safety of electric vehicles, and the safety level requirements of traction motors are the highest in the entire system safety level. Stall refers to the abnormal increase of the motor speed of the traction motor under the influence of non-external force, which leads to an unstable state of the system. At present, this kind of situation is often encountered in the traction motor bench test. The abnormal protection of the dynamometer causes the traction motor und...

Claims

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Application Information

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IPC IPC(8): B60L15/20B60L3/00
CPCY02T10/72
Inventor 刘爱华陈小江
Owner SHENZHEN HANGSHENG ELECTRONICS
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