A kind of weak magnetic control method and device

A technology of field-weakening control and reference voltage, which is applied in the direction of single motor speed/torque control, etc., can solve the problems that the field-weakening control of permanent magnet synchronous motors cannot be natural and smooth, current jumping cannot be completely eliminated, and speed fluctuations are unstable. Achieve high resistance, eliminate current jump, and improve stability

Active Publication Date: 2018-02-27
SHENZHEN ZHENBANG TECH
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  • Abstract
  • Description
  • Claims
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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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  • A kind of weak magnetic control method and device
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  • A kind of weak magnetic control method and device

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Experimental program
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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 present invention is applicable to the field of field weakening control of permanent magnet synchronous motors, and provides a field weakening control method and device. The field weakening control method includes: obtaining a DC bus voltage and a d-axis reference voltage; according to the obtained DC bus voltage and d axis reference voltage to generate the voltage that can be assigned to the q-axis; subtract the voltage that can be assigned to the q-axis and the preset q-axis voltage margin to generate a threshold voltage for field weakening; combine the preset q-axis reference voltage with the Subtracting the start threshold voltage of field weakening to generate a voltage difference; integrating the voltage difference to generate a d-axis reference current. The present invention completely eliminates current jump, speed fluctuation and other unstable phenomena when switching between normal control and field-weakening control when the permanent magnet synchronous motor is normally used, and its fast dynamics have great influence on bus voltage fluctuations. Extremely high resistance, can improve the stability of the permanent magnet synchronous motor.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08
Inventor 邓伟陈志杰
Owner SHENZHEN ZHENBANG TECH
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