Motor drive control

A technology of electric motors and control devices, applied in the direction of electronically commutated motor control, excitation or armature current control, control systems, etc., can solve the problem of inability to wait

Inactive Publication Date: 2005-10-26
TRW LIMITED
View PDF1 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practical demonstration of such a system warns that, in its real noise profile, it is not acceptable for most automotive applications

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 drive control
  • Motor drive control
  • Motor drive control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0055] systematic review

[0056] Referring to FIG. 3, a three-phase brushless motor 1 is provided as an example, which includes a rotor 2 having, for example, six embedded magnets 4 therein, which in this example are arranged to provide Six poles alternating north and south. The rotor thus defines three indirect or d-axes spaced evenly around the rotor and three quadrature or q-axes disposed between the d-axes. The d-axis is aligned with the poles of the magnet 4, where the flux lines from the rotor are radial, and the q-axis is arranged between the d-axes, where the flux lines from the rotor are tangential.

[0057] The stator 6 comprises nine slotted copper windings with three sets of three teeth 8A, 8B, 8C, each set of teeth forming a phase with a common winding. There are thus three electrical cycles in each complete revolution of the rotor, and the three teeth 8A, 8B, 8C in any phase are always in the same electrical position as each other.

[0058] Referring to Fig....

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

A drive system for a three phase brushless motor uses an algorithm for position sensing which measures the inductance in the motor phases and determines the position from the measured inductances. In order to reduce acoustic noise, the inductances are measured during test periods Tsd , which are conducting states added to the PWM pattern in each PWM period. The test periods have net voltage of zero and therefore do not affect the output of the motor, but are sufficiently long to allow inductance measuring as well as the use of a single current sensor for current sensing.

Description

technical field [0001] This invention relates to motor control, and more particularly to pulse width modulation (PWM) control of multiphase brushless motors. Background technique [0002] In order to control a motor, the position of the rotor relative to the stator as it turns must be determined so that the current through the motor windings can be controlled to produce the desired torque. This can be achieved using dedicated position sensors, or the position can be estimated from other parameters using sensorless position control. [0003] Sensorless position control reduces system cost by replacing the position sensor that measures the rotor position with a position estimator algorithm in the controller. The algorithm uses knowledge of applied phase or line-to-line voltages, measured phase voltages, and a model of the motor drive system to determine the rotor position. [0004] There are many known techniques for implementing sensorless control, but they fall into two br...

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): H02P6/16H02P6/18H02P7/06
CPCH02P6/185H02P6/18H02P21/00
Inventor 杰弗里·R·科尔斯康奈尔·威廉斯
Owner TRW LIMITED
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap