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Dust collector, back electromotive force zero-crossing detection method and device of motor and control system

A zero-crossing detection and control system technology, applied in the field of vacuum cleaners, brushless DC motor control systems, and back-EMF zero-crossing detection devices, can solve problems such as affecting the accuracy of zero-crossing detection, low reliability, and fluctuations.

Active Publication Date: 2020-02-21
JIANGSU MIDEA CLEANING APPLIANCES +1
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Problems solved by technology

[0004] However, the above-mentioned judgment method has the following disadvantages: 1) When using a single judgment of the back EMF zero crossing, it is only judged once, and the reliability is not high. For example, the back EMF of the brushless DC motor may There will be fluctuations. At this time, the accuracy of zero-crossing detection will be affected by using a single judgment of back EMF zero crossing; Zero-crossing will cause the detection of zero-crossing detection to lag, which is not good for the control effect

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  • Dust collector, back electromotive force zero-crossing detection method and device of motor and control system
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  • Dust collector, back electromotive force zero-crossing detection method and device of motor and control system

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[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0038] The method for detecting the zero crossing of the back EMF of the brushless DC motor, the non-transitory computer-readable storage medium, the device for detecting the zero crossing of the back EMF of the brushless DC motor, and the brushless DC motor will be described below with reference to the accompanying drawings. Control system and vacuum cleaner.

[0039] figure 1 It is a flow chart of the method for detecting the zero-crossing of the back EMF of the brushless DC motor according to the embodiment of the present inv...

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Abstract

The invention discloses a dust collector, a back electromotive force zero-crossing detection method and device of a brushless DC motor and a control system. The back electromotive force zero-crossingdetection method of the brushless DC motor comprises the following steps: in the process of detecting the back electromotive force of the brushless DC motor, judging whether a leading edge of the backelectromotive force is detected or not; if the leading edge of the back electromotive force is detected, judging that the back electromotive force of the brushless DC motor crosses zero when a back electromotive force zero crossing point is detected for a first preset number of times; and if the leading edge of the back electromotive force is not detected, judging that the back electromotive force of the brushless DC motor crosses zero when the back electromotive force zero crossing point is detected for a second preset number of times, wherein the second preset number of times is greater than the first preset number of times. The back electromotive force zero-crossing detection method of the brushless DC motor can timely and effectively detect whether the back electromotive force of thebrushless DC motor crosses zero or not.

Description

technical field [0001] The present invention relates to the technical field of motor control, in particular to a back EMF zero-crossing detection method for a brushless DC motor, a back EMF zero-crossing detection device for a brushless DC motor, a control system for a brushless DC motor and a Vacuum cleaner. Background technique [0002] At present, in the technical field of sensorless drive control of brushless DC motors, there are many methods for detecting the rotor position of the motor, among which the back EMF zero-crossing method is simple, effective and widely used. The basic principle of the back EMF zero crossing method is that when the back EMF of a certain phase winding of a brushless DC motor crosses zero, the direct axis of the rotor coincides with the axis of the phase winding, so as long as the back EMF zero crossing point of each phase winding is judged, it can be Know the rotor position of the motor. [0003] In related technologies, there are generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/182G01R19/175
CPCG01R19/175H02P6/182H02P2203/03
Inventor 王浩东吴偏偏
Owner JIANGSU MIDEA CLEANING APPLIANCES
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