Check patentability & draft patents in minutes with Patsnap Eureka AI!

Back electromotive force velometer

A back-EMF, tachometer technology, applied in electronic commutator, single motor speed/torque control, etc., can solve the problems of heavy system weight, large space occupation, low reliability, etc., to increase flexibility and low cost , the effect of high reliability

Inactive Publication Date: 2010-11-03
TSINGHUA UNIV
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of brushless DC motor application control system, in order to realize speed closed-loop control and improve the performance and response speed of the entire control system, it is often necessary to detect the speed of the motor. However, the current control system usually uses a speed measuring motor to detect the speed of the motor. There is a system Disadvantages such as complexity, large space occupation, heavy system weight, and low reliability

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
  • Back electromotive force velometer
  • Back electromotive force velometer
  • Back electromotive force velometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The following drawings and examples further illustrate the present invention, and the drawings described here are used to provide a further understanding of the present invention, constitute a part of the application, and do not constitute a limitation to the present invention. Among them, Table 1 is the control logic truth table of the logic control device.

[0026] Back EMF tachometer see attached figure 2 , including: a signal conditioning circuit, an analog switch, a logic control unit (LCU) and an adder, where:

[0027] The signal conditioning circuit is composed of a voltage divider circuit, a filter circuit and a voltage follower, and is provided with: an input terminal and an output terminal; the input terminal is connected to the winding terminal of the external brushless DC motor; the output terminal is connected to the subsequent analog switch connected;

[0028] The analog switch is composed of three multi-channel analog switches S1, S2, and S3, and is pr...

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 relates to a back electromotive force velometer which belongs to the technical field of the detection and the control of brushless direct current motors. The velometer is characterized by comprising a signal conditioning circuit, an analog switch, a logic control unit (LCU) and a summator, wherein after the voltage of a winding end of a brushless direct current motor passes through the signal conditioning circuit, the voltage is respectively connected with a signal input end of the analog switch; a motor rotator position sensor signal is connected with a rotor position signal input end of the LCU; the output end of the analog switch is respectively connected with the input end of the summator; and the LCU controls the analog switch to work according to the rotor position signal to ensure that the output of the summator is the back electromotive force of the motor winding, and the back electromotive force is in a direct proportion to the rotating speed of the motor so as to detect the rotating speed of the motor. The velometer does not need mechanically connected components and has the advantages of simplicity, reliability, low cost, and the like.

Description

technical field [0001] The invention belongs to the technical field of brushless DC motor detection and control. Background technique [0002] In the field of brushless DC motor application control system, in order to realize speed closed-loop control and improve the performance and response speed of the entire control system, it is often necessary to detect the speed of the motor. However, the current control system usually uses a speed measuring motor to detect the speed of the motor. There is a system It has disadvantages such as complexity, large space occupation, heavy system weight, and low reliability. In order to overcome the shortcomings caused by the speed measurement of the above-mentioned speed measuring motor, the present invention proposes to detect the speed of the motor by measuring the electromotive force of the brushless DC motor winding based on digital technology. Contents of the invention [0003] The purpose of the present invention is to provide a s...

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 Applications(China)
IPC IPC(8): H02P6/08H02P6/16H02P6/17
Inventor 朱纪洪司宾强
Owner TSINGHUA UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com