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Sensorless control method for permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., and can solve the problems of limited rapidity and anti-disturbance ability, inaccurate estimation, and phase delay, etc., to achieve The effect of weakening chattering, widening the estimation range, and reducing the amount of calculation

Active Publication Date: 2017-02-15
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

However, the chattering of the traditional sliding mode observer without position control system is relatively large, and at the same time, due to the use of low-pass filter, it will bring the problem of phase delay
When the motor is running at low speed, the traditional sliding mode observer positionless control system is not accurate enough to estimate the rotor position
When there are parameter perturbations and load disturbances in the system, the rapidity and anti-disturbance ability of the traditional sliding mode observer positionless control system are very limited

Method used

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  • Sensorless control method for permanent magnet synchronous motor
  • Sensorless control method for permanent magnet synchronous motor
  • Sensorless control method for permanent magnet synchronous motor

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Embodiment Construction

[0040] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] like figure 1 As shown, the position sensorless control system of permanent magnet synchronous motor includes current state observer, back EMF observer and rotor position estimation module.

[0042] The specific control method of the permanent magnet synchronous motor sensorless control system includes the following steps:

[0043] 1) The back EMF observer is constructed by using the back EMF equation of the permanent magnet synchronous motor.

[0044] The complex vector of the permanent magnet synchronous motor back EMF equation can be expressed as:

[0045]

[0046] in, is the back EMF complex vector, ψ f is the permanent magnet flux linkage, θ is the rotor electric position angle, ω e is the electrical angular velocity of the motor rotor.

[0047] Since the reaction time of the speed change is much shorter ...

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Abstract

The invention discloses a sensorless control method for a permanent magnet synchronous motor. The sensorless control method comprises the following steps: step (1), using a back electromotive force equation of the permanent magnet synchronous motor to build a back electromotive force observer; step (2), using a current state observer to obtain a sliding mode variable structure control function, obtaining an equivalent control function of a sliding mode variable structure, and combining a feedback gain coefficient to calculate and obtain the back electromotive force; and step (3), calculating the back electromotive force to obtain a rotor position through a rotor position estimation module. A state feedback gain and a disturbance decoupling observer are further added to the current state observer. The control method of the invention can effectively weaken the chattering phenomenon in a system, solves the phase delay problem, improves the system robustness and anti-interference ability, improves the low speed estimation accuracy of the rotor position, and further broadens the range of rotor position estimation.

Description

technical field [0001] The invention relates to a sensor control method for a permanent magnet synchronous motor, in particular to a sensorless control method for a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors are favored in the field of high-performance drives because of their small size, high efficiency, easy maintenance, and strong adaptability to the environment. In the permanent magnet synchronous motor control system, a mechanical position sensor is generally required to detect the rotor position and speed. However, the use of mechanical sensors will not only increase the cost and volume of the system, but also reduce the reliability of the system, thereby limiting the application in high-performance drive applications. Therefore, the research on the sensorless control of permanent magnet synchronous motor is of great significance. [0003] The sliding mode observer has the characteristics of simple principle a...

Claims

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Application Information

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IPC IPC(8): H02P21/13H02P21/00H02P21/22H02P21/18H02P6/182
CPCH02P6/182H02P21/0007H02P21/13
Inventor 樊英张丽
Owner SOUTHEAST UNIV
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