Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Motor locked-rotor protection method and device

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

Active Publication Date: 2019-08-23
WEICHAI POWER CO LTD
View PDF7 Cites 15 Cited by
  • Summary
  • 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

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
  • Motor locked-rotor protection method and device
  • Motor locked-rotor protection method and device
  • Motor locked-rotor protection method and device

Examples

Experimental program
Comparison scheme
Effect test

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...

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 invention provides a motor locked-rotor protection method and device. The method comprises the steps: acquiring a stator current of a motor and a rotating speed of the motor in real time; when thestator current is greater than or equal to a preset first current threshold value and the rotating speed is less than or equal to a preset first rotating speed threshold value, starting a counter forcounting, and carrying out the counting according to a preset counting rule; when the count of the counter is greater than a preset first count threshold value, determining that the motor enters a locked-rotor state, and controlling the motor to reduce power based on the count of the counter under the condition that the motor enters the locked-rotor state, or controlling the motor to reduce the power based on a temperature value difference value between a first transistor and a second transistor. Therefore, whether the motor is in the locked-rotor state or not can be monitored in real time, and when the motor is in the locked-rotor state, the power of the motor is reduced in time, thereby protecting a three-phase insulated gate bipolar transistor from being burnt out due to high temperature, and 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

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
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com