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A motor stall protection method and device

A technology of motor stalling and motor controller, applied in the direction of motor control, electrical components, control systems, etc., can solve the problems of long time, IGBT burnout, etc., and achieve the effect of avoiding burnout and reducing power

Active Publication Date: 2021-05-18
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, embodiments of the present invention provide a motor stall protection method and device to solve the problem that the motor enters the stall state for too long, causing the IGBT in the motor controller to burn out due to high temperature

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  • A motor stall protection method and device
  • A motor stall protection method and device

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Embodiment Construction

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0062] Such as figure 1 As shown, a motor stall protection method provided by an embodiment of the present invention includes the following steps:

[0063] S101: Obtain the stator current of the motor and the speed of the motor in real time.

[0064] Among them, the stator current and speed of the motor are related to the running state of the motor itself. The stator current is in a high current state when it is output at full power, and the motor is in a hig...

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Abstract

The present invention provides a motor stall protection method and device. By obtaining the stator current of the motor and the rotational speed of the motor in real time, when the stator current is greater than or equal to the preset first current threshold and the rotational speed is less than or equal to the preset first rotational speed threshold , start the counter to count, and count according to the preset counting rule. When the count of the counter is greater than the preset first counting threshold, it is determined that the motor enters the stalled state. When the motor enters the stalled state, based on the counting of the counter, The motor is controlled to reduce power, or the motor is controlled to reduce power based on the temperature value difference between the first transistor and the second transistor. It can be seen that in the present invention, it is possible to monitor in real time whether the motor enters a locked-rotor state, and when the motor enters a locked-rotor state, reduce the power of the motor in time to prevent the three-phase insulated gate bipolar transistor from burning out due to high temperature, thereby protecting the motor controller .

Description

technical field [0001] The invention relates to the technical field of machinery and electronics, in particular to a method and device for protecting a motor from locked-rotor. Background technique [0002] With the rise of new energy and environmental awareness, the popularity of electric vehicles is becoming wider and wider. In the design of electric vehicle drive system, there is a performance index of maximum climbing. During the maximum climbing performance test of an electric vehicle, the tires will lock up. At this time, the motor speed of the electric vehicle approaches zero, and the motor stalls. In the case of a motor stall, the three-phase insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) in the motor controller no longer switches the switch, causing the IGBT of a certain phase to heat up rapidly, thereby burning out the IGBT, causing Damage to the motor controller. [0003] At present, the existing technology usually adds sensors to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P29/024H02P29/68
CPCH02P29/024H02P29/68
Inventor 张磊高乐赵广兴吕凤龙徐亚美
Owner WEICHAI POWER CO LTD
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