Zero passage detection method and device of counter electromotive force of permanent magnet direct current brushless Hall motor

A back electromotive force, permanent magnet DC technology, applied in the direction of measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve the problems of short freewheeling time and high cost, and achieve the effect of low cost, high precision and good control performance

Active Publication Date: 2012-04-25
SINO WEALTH ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method is not suitable for motors with small armature inductance, the freewheeling time is too short, an external comparator is required, and the cost is too high

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  • Zero passage detection method and device of counter electromotive force of permanent magnet direct current brushless Hall motor
  • Zero passage detection method and device of counter electromotive force of permanent magnet direct current brushless Hall motor
  • Zero passage detection method and device of counter electromotive force of permanent magnet direct current brushless Hall motor

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0024] Before starting to describe the specific embodiments of the present invention, let’s take a look at the detailed derivation process of the formula for judging whether the counter electromotive force of the permanent magnet DC brushless Hallless motor in the present invention crosses zero:

[0025] Assuming that the permanent magnet DC brushless Hallless motor of the embodiment of the present invention is symmetrical in three phases, in an ideal state, the equivalent schematic diagram of the motor and its main drive circuit can be as follows figure 1 shown. As shown in the figure, the motor M can be equivalent to a structure consisting of three phases of stator windings A, B, and C, where phase A can include resistors R connected in series A , inductance L A an...

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Abstract

The invention provides a zero passage detection method of counter electromotive force of a permanent magnet direct current brushless Hall motor, comprising the following steps of: applying PWM (Pulse Wavelength Modulation) voltage on two phases of three stator windings of the motor; detecting the voltage of a conducting phase and a non-conducting phase of the motor after the follow current of thePWM waveform during low level is finished; and judging whether the counter electromotive force passes zero or not by calculating the difference between two times of non-conducting voltage and the voltage of the conducting phase. The invention also provides a zero passage detection device of the counter electromotive force of the permanent magnet direct current brushless Hall motor. Since the detection is not carried out when the PWM waveform is high level, the filter and high-frequency noise can be avoided; and the invention has the advantages of favorable control performance, high precision,wide application range and low cost and is simple for realization in the whole detection process, can conveniently determine the position of a motor rotor in the operation process and realize the control of a brushless direct current motor without a Hall sensor.

Description

technical field [0001] The invention relates to the technical field of permanent magnet DC brushless Hallless motors, in particular, the invention relates to a zero-crossing detection method and a zero-crossing detection device for the counter electromotive force of a permanent magnet DC brushless Hallless motor. Background technique [0002] For the permanent magnet DC brushless Hallless motor, in order to commutate accurately during operation, the position of its rotor should be determined first. In order to determine the position of the rotor, the counter electromotive force zero-crossing detection method can be used. Some existing back EMF zero-crossing detection methods include: [0003] (1) The detection method of measuring the terminal voltage of the non-conducting phase of the motor to determine the zero crossing point of the counter electromotive force. However, it needs to obtain the mid-point voltage of the motor winding, the signal-to-noise ratio is low, and fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/175
Inventor 陈朝辉周序伟辛巍尹志光
Owner SINO WEALTH ELECTRONICS
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