Sensorless permanent-magnet synchronous motor starting control method and corresponding system

A permanent magnet synchronous motor and sensor technology, which is applied in the control system, vector control system, motor generator control and other directions, can solve the problem of out-of-step of the starting control method, and achieve the effect of simple and easy-to-implement starting control.

Inactive Publication Date: 2015-12-23
XUJI GRP +3
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a sensorless permanent magnet synchronous motor starting control method and a corresponding system to solve the problem of out of step in the permanent magnet synchronous motor starting control method in the prior art

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  • Sensorless permanent-magnet synchronous motor starting control method and corresponding system
  • Sensorless permanent-magnet synchronous motor starting control method and corresponding system
  • Sensorless permanent-magnet synchronous motor starting control method and corresponding system

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the permanent magnet synchronous motor starting control system of the present invention includes a motor control branch, a current feedback branch, an angle planning branch and a motor speed calculation branch, which constitute a motor current loop control mode.

[0026] The motor control branch includes a current comparator, a current loop controller, a Park / Clark inverse converter and a power amplifier; it is used to control the permanent magnet according to the q and d axis current control on the stator side of the permanent magnet synchronous motor in the given vector control For synchronous motors, the q-axis current on the stator side of the permanent magnet synchronous motor in the given vector control is 0, and the d-axis current is within the rated current value of the set multiple. The current commands of the d and...

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Abstract

The invention relates to a sensorless permanent-magnet synchronous motor starting control method and a corresponding system. The method comprises the following steps of (1) setting a current command I of a q axis of a permanent-magnet synchronous motor stator side in vector control to be 0, and controlling a current command I of a d axis within a rated current value of a set multiple; (2) gradually increasing a given value Angle of a planned rotor angle to 360 degrees from 0 degree; and (3) judging whether starting of a permanent-magnet synchronous motor is completed or not; if the motor starting is completed, entering the vector control of a voltage outer ring and a current inner ring; if the motor starting is not completed, returning back to the step (1) and starting again. A method based on current closed-loop control is used for zero correction on a motor rotor, the permanent-magnet synchronous motor is controlled according to the currents of the q axis and the d axis of the permanent-magnet synchronous motor stator side, and the over-current is prevented since the currents of the q axis and the d axis can be controlled; the motor can be ensured to be prevented from being out-of-step during the starting process by planning the rotor angle and reasonably using constant angle acceleration step size.

Description

technical field [0001] The invention belongs to the field of motor servo control, and in particular relates to a sensorless permanent magnet synchronous motor starting control method and a corresponding system. Background technique [0002] Permanent magnet synchronous motors are widely used in the field of industrial control because of their high power density, low loss, and high reliability. The control of permanent magnet synchronous motor needs to obtain reliable rotor position information, and rotor position sensors such as resolvers or encoders are often used for measurement. These devices add cost to the system and are difficult to install. Therefore, the sensorless control method has become a research hotspot, but if the control is not done properly, problems such as out-of-step and over-current may occur. Commonly used sensorless control methods for permanent magnet synchronous motors include "back electromotive force method", "high frequency signal injection meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 邢珊珊田素立王全海孙莹莹王晋华陈智杰
Owner XUJI GRP
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