Control method of brushless DC motor (BLDC) position signal phase error based on back EMF zero crossing point reconstruction

A technology of signal phase and control method, applied in the direction of electronic commutation motor control, control system, electrical components, etc., can solve the problem that the phase shift cannot reach an accurate 30°, and achieve the effect of compensating errors

Inactive Publication Date: 2009-12-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Since the cut-off frequency of the RC filter cannot change with the change of speed, the phase shift cannot reach an accurate 30° under different speed conditions. Therefore, under the operating conditions of wide speed, it is necessary to shift the phase of the back EMF on the basis of the traditional method compensate

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  • Control method of brushless DC motor (BLDC) position signal phase error based on back EMF zero crossing point reconstruction
  • Control method of brushless DC motor (BLDC) position signal phase error based on back EMF zero crossing point reconstruction
  • Control method of brushless DC motor (BLDC) position signal phase error based on back EMF zero crossing point reconstruction

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[0016] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0017] The permanent magnet brushless DC motor drive system that adopts this specific implementation method is composed as follows figure 1 shown. It includes four parts: 1) control module with DSP2812 as the control core; 2) three-phase full-bridge power module; 3) permanent magnet brushless DC motor body; 4) first-order RC low-pass filter circuit module.

[0018] The control module with TMS320F2812 as the control core mainly has four tasks: 1) Acquisition of the back EMF signal; 2) Real-time calculation of the phase shift angle α caused by the RC first-order low-pass filter; 3) The AD sampling Three opposite potentials carry out coordinate transformation, that is, calculate the projection of the alfa coordinate system under the belta coordinate system, so that the belta coordinate system lags behind the alfa coordinate system β (β=π / 6-α); 4) According to the th...

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Abstract

The invention discloses a control method of brushless D.C. motor (BLDC) position signal phase error based on back EMF zero crossing point reconstruction, belonging to the technical field of the control method of BLDC non-position sensor technology. The method comprises the following steps: respectively collecting three phases of filtered terminal voltage waveforms, the coordinate systems thereof being alfa coordinate system in which vectors of three axels in the alfa coordinate system are used for representing three filtered terminal voltages, calculating the projection of the three vectors of the alfa coordinate system in the belta coordinate system. The degree beta by which the belta coordinate system lags behind the alfa coordinate system is controlled to achieve real-time compensation for the error of position signal phase caused by RC first order low pass filtering, and the zero-crossing points of the three vectors in the belta coordinate system are phase-changing points, thus realizing accurate phase-changing. The invention can avoid being affected by RC filtering under the working condition of broad rotating speed.

Description

technical field [0001] The invention relates to a method for controlling the phase error of a BLDC position signal reconstructed by a back EMF zero crossing point, and belongs to the technical field of the control method of the BLDC position sensorless technology. Background technique [0002] At present, sensorless technology is an important research direction in the field of motor and drive for nearly two decades, and a variety of control technologies have been developed. In the field of permanent magnet brushless DC motor (bldc) sensorless technology, the position sensorless technology of judging the rotor position based on the back EMF zero crossing information is an important part, and three main directions are derived: 1) terminal voltage 2) phase voltage method; 3) third harmonic method. These three main directions have two common problems that need to be solved: 1) how to eliminate the noise brought by PWM; 2) how to accurately shift the phase of the back EMF zero-c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/16H02P6/182
Inventor 吴元元王寅凌星王晓琳邓智泉
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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