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A control method for a single-phase brushless motor

A single-phase brushless motor and control method technology, applied in the direction of single-phase motor control, etc., can solve the problems of high current peak value, current waveform distortion, poor performance of the whole machine, etc.

Active Publication Date: 2021-12-14
NANJING CHERVON IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the same application, the single-phase brushless motor has more serious armature reaction than the three-phase brushless motor, and the back EMF waveform drops sharply in the later stage of the conduction region, which will cause extremely high current peaks and serious distortion of the current waveform , the overall performance is poor

Method used

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  • A control method for a single-phase brushless motor
  • A control method for a single-phase brushless motor
  • A control method for a single-phase brushless motor

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Embodiment Construction

[0037] The present invention is further detailed below with reference to the accompanying drawings and examples. It will be appreciated that the specific embodiments described herein are merely illustrative of the invention and are not limited thereto. It will also be also to be described, and only the parts associated with the present invention are shown in the drawings rather than all structures.

[0038] figure 1 A control flowchart of a method embodiment to provide a single-phase brushless motor of the embodiment of the present invention, the single-phase brushless motor may be used for electric power tool, the power tool includes a position sensor, a driving circuit and a controller; Illustratively, figure 2 System block diagram of a single-phase brushless motor provided in the embodiment of the present invention, see figure 2 The power tool may comprise a single-phase brushless motor 110, the position sensor 120, controller 130 and a driving circuit 140. The control method ...

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Abstract

The invention discloses a control method of a single-phase brushless motor. The brushless motor using this control method is used in an electric tool, and the electric tool includes a position sensor, a drive circuit and a controller; the control method includes: when the position signal output by the position sensor changes, the controller After closing the currently output control signal and lagging the non-conduction angle T, the controller triggers to output a target control signal to the drive circuit, and the drive circuit drives the single-phase brushless motor according to the target control signal. The control method uses the change of the position signal output by the position sensor as an instruction, the controller turns off the current output control signal, and triggers the target control signal to the drive circuit after the non-conduction angle T to drive the single-phase brushless motor to reduce current spikes in single-phase brushless motors. The overall performance of the single-phase brushless motor is improved, and the size of the electric tool motor and the corresponding control board are reduced.

Description

Technical field [0001] Technical Field Example embodiments relate to controlling the motor according to the present invention, in particular, it relates to a method of controlling a single-phase brushless motor. Background technique [0002] In recent years, with the new permanent magnet materials, microelectronic technology, automatic control technology and the development of power electronics technology, especially high-power switching devices, a brushless motor has been considerable development. Single-phase brushless motor due to the relative minimum number of relatively simple electrical system, a drive control circuit required for a small cost, been more widely used in electric tools, fans, vacuum cleaners, and other fields. However, because of its low operating efficiency with respect to the three-phase brushless DC motor, a single-phase brushless relatively small market applications DC motor. [0003] After the motor, the conduction interval rotor back EMF reaches a maxim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/26
Inventor 王宏伟李文成
Owner NANJING CHERVON IND
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