Speed sensor-less control method and system for permanent magnet synchronous motor

A permanent magnet synchronous motor, speed sensorless technology, applied in control systems, motor control, vector control systems, etc., can solve problems such as narrow application range and insufficient observation accuracy, achieve accurate results, simple principles, and solve DC offsets and harmonic effects

Active Publication Date: 2017-12-22
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a speed sensorless control method and system for a permanent magnet synchronous motor, thereby solving the technical problems of narrow application range and insufficient observation accuracy in the prior art

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  • Speed sensor-less control method and system for permanent magnet synchronous motor
  • Speed sensor-less control method and system for permanent magnet synchronous motor
  • Speed sensor-less control method and system for permanent magnet synchronous motor

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Embodiment 1

[0120] Embodiment 1 of the present invention is based on a 3kW permanent magnet synchronous motor drive platform, and the speed sensorless control method of the above permanent magnet synchronous motor is compared with the conventional deadbeat predictive current control method. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0121] The parameters of the permanent magnet synchronous motor used are as follows: number of pole pairs n p = 3, rated power P = 3kW, rated current I N =6.8A, stator resistance R s =0.8Ω, the inductance of the AC and D axis is equal: L=L q = L d =0.005H, damping coefficient B=7.403×10 - 5 N·m·s / rad, torque inertia J=3.78×10 -4 kg·m 2 , rotor flux linkage ψ f = 0.35wb. Figure 5 is the rotor flux linkage observed experimentally at 1000rpm: Figure 5 (a) The gray dotted line is the rotor flux circle obtained by traditional first-order integ...

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Abstract

The invention discloses a speed sensor-less control method and system for a permanent magnet synchronous motor. The method includes steps of: obtaining three-phase voltage and three-phase current of the permanent magnet synchronous motor, and performing Clark conversion of the three-phase voltage and the three-phase current of the permanent magnet synchronous motor to obtain equivalent current and equivalent voltage of the permanent magnet synchronous motor in the [alpha][beta]-axis coordinate system; obtaining the counter electromotive force of the motor in the [alpha][beta]-axis coordinate system according to the equivalent voltage and the equivalent current in the [alpha][beta]-axis coordinate system; placing the counter electromotive force of the motor in the [alpha][beta]-axis coordinate system into a high-order generalized integrator to automatically eliminate the direct current component and the alternating current component in the counter electromotive force of the motor, and then obtaining the rotor flux in the [alpha][beta]-axis coordinate system; based on the rotor flux in the [alpha][beta]-axis coordinate system, extracting the rotor position and motor speed, and driving the permanent magnet synchronous motor to operate. The method and the system have the advantages of high precision of dynamic steady state control and good parameter robustness, and improve the control accuracy and operation reliability of the speed sensor-less control of the permanent magnet synchronous motor.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors, and more specifically relates to a speed sensorless control method and system for permanent magnet synchronous motors. Background technique [0002] In recent years, with the development of rare earth permanent magnet materials and power devices, permanent magnet synchronous motors (Permanent Magnet Synchronous Motor, PMSM) have received extensive attention for their high performance, high torque inertia ratio and high energy density, especially The decline in the price of permanent magnet materials and the improvement of magnetic properties have greatly promoted the development and application of permanent magnet synchronous motors. In recent years, the permanent magnet synchronous motor system is playing an increasingly important role in the servo system with high precision and wide speed range. The high-performance permanent magnet synchronous motor control system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/26
CPCH02P21/18H02P21/26H02P2203/09
Inventor 徐伟蒋亚杰刘毅叶才勇
Owner HUAZHONG UNIV OF SCI & TECH
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