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Flux-weakening control method and flux-weakening control device

A technology of field weakening control and reference voltage, applied in the direction of speed/torque control of a single motor, which can solve the problems of inability to completely eliminate current jumping, unstable speed fluctuations, and inability to naturally smooth the field weakening control of permanent magnet synchronous motors. Achieve high resistance, improve stability, and eliminate the effect of current jumping

Active Publication Date: 2015-12-30
SHENZHEN ZHENBANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a field weakening control method, which aims to solve the problem that the existing field weakening control method cannot make the field weakening control of the permanent magnet synchronous motor natural and smooth, and cannot completely eliminate the gap between the normal control and the field weakening control. Current jumps, speed fluctuations, and other instabilities during switching

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  • Flux-weakening control method and flux-weakening control device

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Embodiment 1

[0026] figure 1 It is a flow chart of the implementation of the field weakening control method provided by the embodiment of the present invention, which is described in detail as follows:

[0027] In step S101, the DC bus voltage and the d-axis reference voltage are acquired;

[0028] In step S102, according to the acquired DC bus voltage and the d-axis reference voltage, generate the voltage that can be allocated to the q-axis;

[0029] In step S103, the voltage that can be allocated to the q-axis and the preset q-axis voltage margin are subtracted to generate a field weakening start threshold voltage;

[0030] In step S104, subtracting the preset q-axis reference voltage from the threshold voltage for starting the field weakening to generate a voltage difference;

[0031] In step S105, the voltage difference is integrated to generate a d-axis reference current.

[0032] Wherein, the reference current of the d-axis is generated by integrating the voltage difference, speci...

Embodiment 2

[0039] The embodiment of the present invention mainly describes the implementation process of step S102, which is described in detail as follows:

[0040] According to the obtained DC bus voltage, the d-axis reference voltage and the pre-configured data table, the voltage that can be assigned to the q-axis is generated.

[0041] Wherein, before the obtained DC bus voltage, d-axis reference voltage and pre-configured data table, it also includes:

[0042] A data table is configured, the data table includes a quantized value and a coefficient corresponding to the quantized value, and the quantized value is a value quantized by a ratio of the d-axis reference voltage to the DC bus voltage.

[0043] In the embodiment of the present invention, a transformed and simple look-up table algorithm is adopted, which occupies less time of the MCU and has strong real-time performance.

Embodiment 3

[0045] figure 2 It is a flow chart of the implementation of step S103 of the field weakening control method provided by the embodiment of the present invention, and is described in detail as follows:

[0046] In step S201, comparing the acquired DC bus voltage with the d-axis reference voltage d-axis reference voltage to generate a ratio;

[0047] In step S202, the generated ratio is quantized to generate a quantized value;

[0048] In step S203, in the data table, look up the corresponding coefficient according to the quantization value;

[0049] In step S204, the DC bus voltage is multiplied by the coefficient to generate a voltage that can be allocated to the q-axis.

[0050] In the embodiment of the present invention, the converted and simple look-up algorithm is used to find the corresponding coefficient according to the quantized value, and the voltage that can be allocated to the generated q-axis can be quickly obtained, so the real-time performance is strong, and th...

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Abstract

The invention is applicable to the field of permanent magnet synchronous motor flux-weakening control, and provides a flux-weakening control method and a flux-weakening control device. The flux-weakening control method comprises the steps of acquiring DC bus voltage and reference voltage of a d-axis; generating voltage which can be distributed to a q-axis according to the acquired DC bus voltage and the reference voltage of the d-axis; subtracting the voltage which can be distributed to the q-axis by preset q-axis voltage margin so as to generate flux-weakening initial threshold voltage; subtracting preset q-axis reference voltage by the flux-weakening initial threshold voltage so as to generate voltage difference; and integrating the voltage difference so as to generate reference current of the d-axis. According to the invention, current jitter, speed fluctuation and other unstable phenomena during switching between normal control and flux-weakening control are fundamentally eliminated under the condition that a permanent magnet synchronous motor is in normal operation, the fast dynamic nature has extremely high resistance for fluctuation in bus voltage, and the stability of the permanent magnet synchronous motor can be improved.

Description

technical field [0001] The invention belongs to the field of field weakening control of permanent magnet synchronous motors, in particular to a field weakening control method and device. Background technique [0002] The permanent magnet synchronous motor can be said to be a motor or a generator. The back electromotive force generated when the motor rotates is proportional to the motor speed. When the motor speed increases to a certain level, its back electromotive force is close to the DC bus voltage. The motor coil current increases and the maximum speed is thus limited. If you want to run at a higher speed, the usual solution is to use the field weakening control method, which is to inject a negative current in the direction of the rotor d-axis, weaken the rotor magnetic flux, forcefully reduce the back electromotive force, and inject more current into the motor coil , to increase the motor speed. [0003] However, the existing field-weakening control methods cannot mak...

Claims

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Application Information

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IPC IPC(8): H02P6/08
Inventor 邓伟陈志杰
Owner SHENZHEN ZHENBANG TECH
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