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Sensor-free start control method for brushless DC motor

A technology of a DC motor and a sensor is applied in the direction of starting devices, etc., which can solve the problems of starting dead spots and reducing the smoothness of starting the brushless DC motor 9.

Active Publication Date: 2011-07-27
SUNONWEALTH ELECTRIC MACHINE IND
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0010] However, in general, the sensorless starting control method of the above-mentioned existing brushless DC motor will have the following disadvantages: Please refer to Figure 4 As shown, in the rotor positioning step S91, the magnetic fields generated by the excitation of the u1, u2, v1 and v2 coils respectively have the same polarity as the magnetic field of the rotor magnetic pole 921, and a starting dead angle occurs
Accordingly, the operator needs to reset the startup control program of the brushless DC motor 9, which will reduce the smoothness of startup of the brushless DC motor 9.

Method used

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  • Sensor-free start control method for brushless DC motor
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  • Sensor-free start control method for brushless DC motor

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Embodiment Construction

[0039] In order to make the above-mentioned and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention are specifically cited below, together with the accompanying drawings, as follows:

[0040] Please refer to Figure 5 As shown, it discloses a sensorless start-up control method for a brushless DC motor according to a preferred embodiment of the present invention, including steps: a first rotor positioning step S1; a second rotor positioning step S2; an open-loop start Step S3; and a closed-loop operation control step S4. By means of the start-up control of the above steps S1 to S4, the brushless DC motor can be stably rotated at a predetermined rotational speed towards the predetermined direction.

[0041] Please refer to Image 6 and 7a As shown, in order to facilitate comparison with the sensorless start-up control method of the existing brushless DC motor, the preferred embodiment of the p...

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Abstract

The invention discloses a sensor-free start control method for a brushless DC motor, which comprises: a primary rotor positioning step, a secondary rotor positioning step, an open loop starting step and a closed loop operation control step. In the method, by the starting step, when a starting dead angle is generated in the primary rotor positioning step, a rotor still can be positioned by the secondary rotor positioning step to further improve positioning accuracy in the starting of the brushless DC motor, reduce power consumption and improve the starting smoothness.

Description

technical field [0001] The present invention relates to a starting control method of a brushless direct current motor, in particular to a starting control method of a brushless direct current motor without a sensor. Background technique [0002] In recent years, the use of motors has played a very important role in many industries. For example, in the application of the cooling fan industry, in order to improve the operating efficiency of the cooling fans, the industry mostly uses brushless DC motors to control the cooling fans. The fan blades rotate to drive wind and dissipate heat from electronic products. [0003] When operating the brushless DC motor, in some occasions, it usually uses the detection of a Hall sensor in advance to determine the magnetic pole position of a rotor, so that the subsequent drive control can be carried out smoothly. However, in some applications, it is often impossible to use the Hall sensor due to environmental conditions (for example, the hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20
Inventor 洪银树李杰峯叶宗宪
Owner SUNONWEALTH ELECTRIC MACHINE IND
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