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Starting method for brushless DC motor

A starting method and DC motor technology, which is applied to the starter of a single DC motor, the motor generator/starter, the deceleration device of an AC motor, etc., which can solve the problems of difficult direction control and the inability of the controller to determine the initial position of the rotor, etc.

Inactive Publication Date: 2009-01-28
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the above applications require the motor to rotate in a predetermined direction, but when the system is in the non-detection mode, or even without the Hall effect mode, the direction control becomes very difficult, because The controller cannot determine the initial position of the rotor

Method used

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  • Starting method for brushless DC motor
  • Starting method for brushless DC motor
  • Starting method for brushless DC motor

Examples

Experimental program
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Embodiment Construction

[0029] As mentioned earlier, figure 1 The asymmetric (eccentric) air gap shown can easily overcome the traditional dead point phenomenon of the motor torque waveform. When the motor with an asymmetric air gap is stationary, the permanent magnet magnetic pole corresponding to a certain stator tooth A1 of the motor is S pole (such as figure 2 The static position shown in (a) one) or N pole (such as figure 2 (b) The resting position shown in b).

[0030] Although the description of the starting method of the present invention is based on the structure of the simplest single-phase brushless DC motor ( figure 2 Two stator teeth and two rotor poles are shown), but this method is more suitable for motors with more stator teeth and rotor poles.

[0031] exist figure 2 In the structure shown, the black part represents the N pole of the rotor, while the gray part represents the S pole of the rotor. The stator teeth of the motor structure are marked as A1 and A2 respectively, as...

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Abstract

A method for starting brushless DC motor includes inputting a current pulse into winding of motor containing an asymmetric air gap to excite motor winding for generating a magnetic field at stator, acting said magnetic field with rotator field to each other to start rotation of rotator then stopping excitation of current pulse at certain time to let rotator rotate according to preset direction under action of a cogging torque or under its own inertia.

Description

technical field [0001] The present invention relates to a method for starting a brushless DC motor, in particular to a single-phase (single-phase) brushless DC motor (brushlessDC motor, BLDCM) that does not require a Hall-effect sensor. Start method. Background technique [0002] General single-phase brushless DC motors are currently being widely used in applications with low starting torque and low power, such as pumps, blowers, and cooling fans )Wait. [0003] The single-phase brushless DC motor must pass a current commutation signal synchronized with the position of the motor rotor to maintain normal operation. In most applications, a Hall effect detector will be used in the motor. To detect the position of the rotor and control the motor. However, the Hall effect detector itself has the disadvantage of being extremely susceptible to temperature changes and affecting the performance of the components. Therefore, applying it to the motor will also make the system using ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/18
Inventor 王微子吴志敢金万兵应建平吴立建黄世民黄文喜
Owner DELTA ELECTRONICS INC