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A field weakening control method and controller for a permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and field weakening control, which is applied in the direction of motor generator control, electromechanical brake control, AC motor control, etc. Problems such as the current regulation effect, to achieve the effect of reducing the torque response time, reducing the risk of runaway, and ensuring effective control

Active Publication Date: 2020-09-29
SAIC MOTOR
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Problems solved by technology

[0005] However, the above-mentioned field weakening control strategy has high requirements on the response speed and steady-state response of the PI regulator of voltage negative feedback, and also has high requirements on the response speed of the current PI regulator.
Usually, if the adjustment process of the field weakening current is slow, the PI regulator will easily enter a saturated state, thereby losing its regulation on the current, and then losing control of the PMSM, resulting in a great safety risk

Method used

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  • A field weakening control method and controller for a permanent magnet synchronous motor
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  • A field weakening control method and controller for a permanent magnet synchronous motor

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Embodiment Construction

[0057] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0058] about figure 1 In the existing field weakening control method shown, when the PMSM is working in the field weakening area, if its torque command and speed change suddenly, the current response speed will be relatively slow, which may cause the saturation of the current regulator and cause the problem of PMSM out of control. In order to overcom...

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Abstract

The present application discloses a permanent magnet synchronous motor (PMSM) flux weakening control method and a controller. The method comprises selecting a direct-axis current initial value and a quadrature-axis current initial value which are approximate values of the direct-axis current and the quadrature-axis current actually required by the motor; then, enabling the PMSM to operate at the direct-axis current initial value and the quadrature-axis current initial value; finally, adjusting the direct-axis current and the quadrature-axis current of the PMSM in order that the PMSM operates from the direct-axis current initial value to a direct-axis current target value, and from the quadrature-axis current initial value to a quadrature-axis current target value, wherein the direct-axis current target value is the direct-axis current actually required by the motor, and the quadrature-axis current target value is the quadrature-axis current actually required by the motor. It can be seen that the current response speed can be greatly increased by quickly locking an approximate value of the actually required current, operating the PMSM at the approximate value and adjusting the current of the PMSM on this basis.

Description

technical field [0001] The present application relates to the technical field of permanent magnet synchronous motors, in particular to a field weakening control method and controller for permanent magnet synchronous motors. Background technique [0002] Permanent magnet synchronous motor (PMSM for short), as its speed increases, the back EMF of PMSM also gradually increases, in order to maintain voltage balance, the output voltage of the inverter connected to PMSM also increases accordingly Big. However, due to the limitation of the PMSM DC side bus voltage, the PMSM output voltage cannot be increased without limit. Therefore, the reverse direction is usually used to increase the stator direct axis current I d A method to equivalently limit the growth of the back EMF, thereby improving the operable range of the PMSM. [0003] see figure 1 The schematic diagram of the field weakening control strategy of the permanent magnet synchronous motor is shown, where, T ecmd Is the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/22H02P25/022
Inventor 武四辈崔宇航王东萃王健陆建国
Owner SAIC MOTOR
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