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Single-phase direct-current brushless motor, and control device and control method thereof

A brushless DC motor and control equipment technology, which is applied in the direction of single-phase motor control, rotation direction control, starting device, etc., to achieve the effect of wide applicability

Active Publication Date: 2019-07-16
BOSCH POWER TOOLS CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a certain operation requires the power tool to rotate in one direction and sometimes in the opposite direction, power tools using single-phase brushless DC motors cannot meet such needs

Method used

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  • Single-phase direct-current brushless motor, and control device and control method thereof
  • Single-phase direct-current brushless motor, and control device and control method thereof
  • Single-phase direct-current brushless motor, and control device and control method thereof

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Embodiment Construction

[0043] Embodiments of the present invention will now be described in detail, examples of which are illustrated in the accompanying drawings, in which like reference numerals refer to like elements throughout.

[0044]The present invention generally relates to a single-phase DC brushless motor, which includes a motor body and a control device connected to the motor body. The motor body includes a stator and a rotor. The structure of the single-phase brushless DC motor will asymmetrically process the cogging of the stator to generate an asymmetric air gap reluctance, thereby overcoming the dead point of the electromagnetic torque. That is to say, for a single-phase brushless DC motor, the centerline of the magnetic circuit of the rotor deviates from the centerline of the stator in the state of no power (see Figure 1a AA', BB') in a certain angle. The direction that deviates from the center line of the stator is defined as the forward direction of the motor rotor, and the other...

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PUM

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Abstract

The invention relates to a single-phase direct-current brushless motor, and a control device and a control method thereof. A body (100) of the motor comprises a rotor (110) and a stator (120). The control device (200) comprises a first position detection apparatus (210) for detecting the position of the rotor (110) and outputting a rotor position signal, a predetermined angle detection device fordetecting whether the rotor (110) rotates forwards for a predetermined angle relative to the first position detection apparatus (210) or not and outputting a detection signal, a commutation circuit apparatus (230) for switching an electrifying phase sequence of a coil winding, and a control apparatus (240). The control apparatus (240) is configured to control the commutation circuit apparatus (230) to enable the rotor to rotate forwards according to the rotor position signal when receiving a backward rotation starting command, and is configured to control the commutation circuit apparatus (230) to enable the rotor to rotate backwards when a detection signal indicates that the rotor (110) rotates forwards for the predetermined angle.

Description

technical field [0001] The present application relates to the field of motor and motor control, and more specifically, to a single-phase DC brushless motor, and a control device and control method for the single-phase DC brushless motor. Background technique [0002] Brushless DC (BLDC) motors use electronic commutators to replace mechanical brushes and mechanical commutators, so that this motor not only retains the advantages of DC motors, but also has the advantages of simple structure, reliable operation, and convenient maintenance of AC motors. advantage. Therefore, brushless direct current (BLDC) motors are adopted by various electric tools. [0003] Among various types of brushless direct current (BLDC) motors, single-phase brushless direct current motors especially have the advantages of long life, fast acceleration, simple structure, and low cost. However, existing single-phase brushless DC motors can only rotate in one direction due to their own electrical charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/26H02P6/30
CPCH02P6/26H02P6/30H02P6/22
Inventor 吴健
Owner BOSCH POWER TOOLS CHINA