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BLDCM current distribution method based on Hall rotation vector QPLL

A technology of rotation vector and current distribution, applied in vector control systems, electrical components, control generators, etc., can solve the problems of limited ability to suppress commutation torque fluctuations, increase control costs and computational complexity, etc.

Pending Publication Date: 2022-04-05
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, the good suppression effect of the PWM-ON-PWM method on the commutation torque fluctuation is only reflected in the low-speed section, and the ability to suppress the commutation torque fluctuation in the high-speed section is still limited
The second type is mainly to suppress the commutation torque fluctuation by directly adjusting the DC bus voltage of the inverter in the BLDCM, but it may greatly increase the control cost and computational complexity

Method used

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  • BLDCM current distribution method based on Hall rotation vector QPLL
  • BLDCM current distribution method based on Hall rotation vector QPLL
  • BLDCM current distribution method based on Hall rotation vector QPLL

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0029] First, the desired phase current i is derived from the BLDCM mathematical model d and electromagnetic torque T e the size of. See the following five formulas for the calculation process. The BLDCM voltage equation is:

[0030] u xg = Ri x +L(di x / dt)+e x + u ng (x=A,B,C) (7)

[0031] where u xg , u ng 、e x and i x They are phase voltage, neutral point voltage, opposite electromotive force and phase current respectively. The formula for calculating the total electromagnetic power of BLDCM is:

[0032] P e = e A i A +e B i B +e C i C (8)

[0033] From Figure 4 In the ideal phase current and the opposite electromotive force, the total instantaneous power available is:

[0034] P e = 2e x i x (x=A,B,C) (9)

[0035] The calculation formula of electromagnetic torque is:

[0036]

[0037] In the formula, ω m is ...

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Abstract

The invention discloses a BLDCM current distribution method based on a Hall rotation vector QPLL. After the difference between the expected rotating speed omega d of the BLDCM and the mechanical angular speed omega m of the rotor is obtained, expected electromagnetic torque Ted is output through a PID rotating speed controller; the Ted is combined with a rotor position theta, and expected phase currents of phases A, B and C are obtained through a current distribution method (CSD); the expected phase current and phase currents iA and iB in the BLDCM pass through a PID current regulator together to obtain an inverter switching signal, and switching of the inverter is controlled through PWM, so that operation of the BLDCM is controlled. In the system, a Hall rotation vector QPLL serves as a feedback circuit, the rotor position theta is obtained through three Hall position signals in the BLDCM, then theta is fed back to the CSD, and omega m is fed back to omega d. According to the method, the rotor position can be obtained only from the three Hall position signals, and then the commutation torque ripple of the BLDCM is reduced to a low value by selecting the current overlap angle theta ov.

Description

technical field [0001] The invention belongs to the technical field of brushless direct current motors, in particular to a brushless direct current motor current distribution control method based on a Hall rotation vector quadrature phase-locked loop. Background technique [0002] As an important driving motor, brushless DC motor (BLDCM) has the characteristics of high efficiency, low cost, reliable structure, long service life and low noise. These advantages make BLDCM widely used in industrial driving, household appliances and electric vehicles. In order to pursue better control performance, reduce the cost of equipment, and improve the reliability of BLDCM, the current research on BLDCM mainly focuses on the research on torque ripple suppression, sensorless control technology and motor optimization. Among them, torque ripple is an important factor hindering the widespread application of BLDCM in high-demand working environments, and it is also a major difficulty in BLDCM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/22H02P6/10H02P27/08
Inventor 王家军郑益衡辛壮壮
Owner HANGZHOU DIANZI UNIV
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