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Commutation method and system of brushless DC motor

A brush DC motor and voltage technology, applied in the commutation method and system field of brushless DC motors, can solve the problems of back electromotive force error zero-crossing signal commutation delay, increased hardware cost and system instability, etc., to achieve the reduction of hardware Cost, burden of simplifying signal acquisition and software comparison, effects of improving response speed and accuracy

Inactive Publication Date: 2013-10-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method needs to use hardware filtering circuit and voltage comparison circuit, it increases hardware cost and system instability
At the same time, due to switching noise, deep filter circuit, voltage comparison circuit and other factors, it is easy to cause the counter electromotive force to miss the zero-crossing signal and commutation delay

Method used

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  • Commutation method and system of brushless DC motor
  • Commutation method and system of brushless DC motor
  • Commutation method and system of brushless DC motor

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Embodiment Construction

[0051] 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.

[0052] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] figure 1 It is a flow chart of Embodiment 1 of the commutation method of the brushless DC motor of the present invention. Such as figure 1 As shown, the method may include:

[0054] Step 101: Obtain the ...

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Abstract

The invention discloses a commutation method and system of a brushless DC motor. The method comprises the following steps of: obtaining a phase voltage of a first phase of the brushless DC motor; obtaining a bus voltage of the brushless DC motor; using a high-speed comparator to compare the sizes of the phase voltage and half of the bus voltage; according to the comparison results, judging whether a zero-cross event occurs in the first phase to obtain a first judgment result; if so, determining the first time from the last commutation to the last zero-cross event by using a main control chip; after waiting the first time, carrying out the commutation. According to the method or system provided by the invention, the hardware cost can be reduced, and the response speed and accuracy of the system can be improved.

Description

technical field [0001] The invention relates to the field of signal control, in particular to a phase commutation method and system for a brushless DC motor. Background technique [0002] With the rapid popularization of electric bicycles, electric bicycle controllers have been widely used in the field of electric bicycles. And BLDCM (brushless DC motor) is widely used as electric bicycle drive motor due to its advantages of simple control, high reliability and large output torque. [0003] Brushless motor control methods are mainly divided into two types: position sensor control and position sensorless control. The present invention is primarily concerned with position sensorless control. [0004] In the prior art, the position sensorless control method for brushless DC motors essentially calculates the rotor position online by collecting physical quantities such as current, voltage, back electromotive force and corresponding motor operating parameters when the motor is w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/14
Inventor 王宜怀吴瑾蒋建武胡玉鑫
Owner SUZHOU UNIV
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