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Parameter identification method of permanent magnet synchronous motor

A permanent magnet synchronous motor and parameter identification technology, which is applied in the control of generators, motor generators, AC motors, etc., can solve the problems that cannot get rid of the dependence of motor parameters and the influence of estimation accuracy

Active Publication Date: 2014-03-26
XIAN UNIV OF TECH
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Problems solved by technology

Traditional MRAS needs to accurately estimate the position deviation. Although the mathematical model is accurate, the estimation accuracy is affected by the change of motor parameters and cannot get rid of the dependence on motor parameters.

Method used

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  • Parameter identification method of permanent magnet synchronous motor
  • Parameter identification method of permanent magnet synchronous motor
  • Parameter identification method of permanent magnet synchronous motor

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] A parameter identification method for permanent magnet synchronous motors, which improves the traditional model reference adaptive structure, that is, on the basis of retaining the original MRAS1 module, a new MRAS2 module is established and constructed as a cascaded model reference adaptive (CMRAS) module; Among them, MRAS1 realizes the identification of rotor speed, and MRAS2 realizes the identification of PMSM stator resistance and rotor flux linkage. When the rotor speed is fed back in real time, the identification value of stator resistance and rotor flux linkage is also fed back to the vector control system at the same time, which can effectively weaken the influence of motor parameter changes on the system. At low speed, due to the real-time update of the stator resistance identification value, the low-speed control performance of...

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Abstract

A parameter identification method of a permanent magnet synchronous motor. A conventional model is improved with reference to an adaptive structure, i.e., based on an original MRAS1 module, a new MRAS2 module is constructed, so that a cascade model reference adaptive control (CMRAS) module is constructed; the MRAS1 is used for identification of a rotor speed; and the MRAS2 is used for identification of a stator resistance and rotor flux. In the invention, while the rotor speed is fed back in the real time manner, the stator resistance and rotor flux identification value is fed back to a vector control system, so that an influence of motor parameters on the system can be effectively lessened; and since the stator resistance identification value is updated in the real time manner at the low speed, the low speed control performance of the system can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and relates to a parameter identification method of a permanent magnet synchronous motor based on cascade model reference self-adaptation (CMRAS). Background technique [0002] Permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) is a complex object with multiple variables, strong coupling, nonlinearity, and variable parameters. It has the advantages of high precision, high dynamic performance, high reliability, and small size. High reliability requirements are widely used in occasions. In recent years, in the permanent magnet synchronous motor vector control system, in order to overcome the defects of high cost, difficult installation and maintenance, reduced anti-interference ability, and reduced reliability caused by the use of mechanical sensors, the speed and position are obtained through various estimation methods. Information-free speed sensor technology has...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P25/02
Inventor 尹忠刚张延庆孙向东钟彦儒
Owner XIAN UNIV OF TECH
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