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A method for estimating position and speed of a permanent magnet synchronous motor running at a low speed

A permanent magnet synchronous motor, low-speed operation technology, used in the control of generators, motor generator control, control of electromechanical transmissions, etc., can solve problems such as uncontrollable current, current spikes and torque fluctuations

Inactive Publication Date: 2018-08-28
CHENGDU FORWARD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional V / F control starting structure is simple and easy to implement, the current is uncontrollable during the starting process, which may easily cause large current peaks and torque fluctuations

Method used

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  • A method for estimating position and speed of a permanent magnet synchronous motor running at a low speed
  • A method for estimating position and speed of a permanent magnet synchronous motor running at a low speed
  • A method for estimating position and speed of a permanent magnet synchronous motor running at a low speed

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Embodiment Construction

[0027] In order to describe the technical content, structural features, goals and effects of the present invention in detail, the following examples are given to describe in detail.

[0028] The present invention is a method for estimating the position and speed of a permanent magnet synchronous motor under low-speed operation, which is suitable for surface-mounted permanent magnet synchronous motors, and is especially suitable for the position and speed of the motor rotor of the surface-mounted permanent magnet synchronous motor under the condition of low-speed operation. Estimation of speed.

[0029] A method for estimating the position and speed of a permanent magnet synchronous motor under low-speed operation of the present invention comprises the following steps:

[0030] Step 1, get the initial position θ of the motor rotor 0 , in the case of open-loop control mode, give the motor rotor a constant vector I q , within time T, make the motor rotor at the initial position...

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Abstract

The invention provides a method for estimating position and speed of a permanent magnet synchronous motor running at a low speed and the method has strong autostability, starting work also can be smoothly completed by the permanent magnet synchronous motor even under different loads, in the starting process, if the electrical machine load is increased, the rotating speed acceleration of an electrical machine is reduced, angle difference between a reality dq shaft and setting dq shaft is reduced, and the new balance of the system is reached by generated larger electromagnetic torque; if the electrical machine load is reduced, the differential seat angle between the reality dq shaft and setting dq shaft is increased, the electromagnetic torque caused by the motor output is reduced, and another stable state of the system is reached. The technical problem that back electromotive force signal is weak, the noise is large, the sliding form estimation error is large and the sliding form cannotbe used for controlling in the low speed condition is overcomed.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for estimating the position and speed of a permanent magnet synchronous motor under low-speed operation. Background technique [0002] For a permanent magnet synchronous motor (PMSM), the commonly used vector control method is the control method with id=0, that is, the d-axis current is controlled to be 0, and the q-axis current is used to represent the torque current. For permanent magnet synchronous motors, when the motor current is mainly concentrated on the q-axis, the change in armature inductance caused by the inductance saturation effect can be basically ignored. However, at medium and high speeds, the influence of changes in rotor resistance and nonlinear factors of the inverter on the accuracy of rotor position estimation is basically negligible. Therefore, at medium and high speeds, for permanent magnet synchronous motors with id=0 control mode, The rotor position...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18
Inventor 陈勇蒙庆阳
Owner CHENGDU FORWARD TECH
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