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Flux-weakening control method for optimizing d-axis field weakening current

A technology of field weakening control and shaft current, applied in motor control, motor generator control, AC motor control, etc., can solve problems such as unsatisfactory field weakening effect

Active Publication Date: 2021-07-06
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lead angle field weakening control method relies on PI to select the field weakening lead angle, and the field weakening effect is not ideal when the load torque fluctuates frequently

Method used

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  • Flux-weakening control method for optimizing d-axis field weakening current

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Embodiment Construction

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0065] A field weakening control method for optimizing the d-axis field weakening current, such as Figure 1-4 shown, including the following steps:

[0066] Step 1, detection of current and speed

[0067] The three-phase current i of the permanent magnet motor is detected by the current sensor a , i b , i c , and through 3s / 2s Clarke and 2s / 2r Park transformation to obtain the current i in the two-phase rotating coordinate system d and i q , the position sen...

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Abstract

The invention discloses a flux-weakening control method for optimizing d-axis flux-weakening current of a permanent magnet motor, and the flux-weakening control method for optimizing the d-axis flux-weakening current is designed based on a load torque observer and a PI controller with dynamically changed parameters by adjusting the d-axis current required by flux weakening through the observed load torque and a PI regulator together. The flux-weakening control method for optimizing the d-axis flux-weakening current is based on the relation between the torque and the needed d-axis flux-weakening current, and the load torque and the d-axis flux-weakening current needed by flux-weakening acceleration are jointly obtained through a load torque estimation and ki parameter dynamic change PI controller; according to the flux-weakening control method for optimizing the d-axis field weakening current, the d-axis field weakening current can be dynamically changed according to the change of the load torque, and the field weakening control effect is slightly influenced by the torque fluctuation; and the PI controller with the ki parameter dynamically changing can adapt to the wide speed regulation range of field weakening control, and it is ensured that the appropriate d-axis field weakening current needed by inertia torque can be provided at all rotating speeds.

Description

technical field [0001] The invention relates to the field of permanent magnet motors, in particular to a field-weakening control method for optimizing d-axis field-weakening current. Background technique [0002] The permanent magnet motor has the advantages of simple structure, high efficiency and wide range of applications. When the terminal voltage of the permanent magnet motor increases with the speed to the maximum voltage value that the inverter can output, the current of the armature winding of the motor can no longer increase. At this time, the permanent magnetic field of the permanent magnet motor needs to be weakened to make the motor speed continue to increase. To meet the constant power control and wide speed range operation. However, if the d-axis field-weakening current is too small during field-weakening control, the motor cannot reach a given high speed, and if the d-axis field-weakening current is too large, the stator current will increase, resulting in a ...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/13H02P21/18H02P21/20H02P21/22H02P27/08
CPCH02P21/0014H02P21/13H02P21/18H02P21/20H02P21/22H02P27/08H02P2205/01
Inventor 林明耀杨安晨林克曼
Owner SOUTHEAST UNIV
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