Rotor revolving speed and displacement soft measurement method of bearingless permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and rotor speed, which is used in measurement devices, motor control, and generator control, etc., can solve the problems of poor identification accuracy, instability, high-frequency signal extraction, and complex signal filtering process.

Active Publication Date: 2019-11-26
HANGZHOU ZHOUJU ELECTRONICS TECHNOLOGICAL
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Problems solved by technology

The high-frequency injection method uses the mutual inductance of the motor torque control winding and the suspension winding, or the relationship between the self-inductance and displacement of the suspension winding, and estimates the radial displacement by detecting the differential voltage at both ends of the suspension winding, but there are high-frequency signal extraction and signal filtering. Complicated processing and other defects; the patent [CN101667799A] proposed a model reference adaptive method ba

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  • Rotor revolving speed and displacement soft measurement method of bearingless permanent magnet synchronous motor
  • Rotor revolving speed and displacement soft measurement method of bearingless permanent magnet synchronous motor
  • Rotor revolving speed and displacement soft measurement method of bearingless permanent magnet synchronous motor

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[0079] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0080] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

[0081] figure 1 A flow chart of a method for soft measurement of rotor speed and displacement of a bearingless permanent magnet synchronous motor according to the present invention is shown.

[008...

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Abstract

The invention provides a rotor revolving speed and displacement soft measurement method of a bearingless permanent magnet synchronous motor, which creates conditions for realizing real-time online control of torque and radial suspension force of the bearingless permanent magnet synchronous motor and is suitable for high-performance control of the bearingless permanent magnet synchronous motor. Inorder to construct a relation among the rotor revolving speed and displacement and other easy-to-measure auxiliary variables, a soft measurement model which is established based an adaptive BP neuralnetwork is provided, and being different from the conventional parameter self-adaption, the method performs adaptive control for the number of hidden layers of the BP neural network, directly determines least square approximation weight and network precision of the neural network through a weight direct determination method, and can realize adaptive design of a hidden layer structure of the neuralnetwork through comparison with expected precision. The neural network model is not dependent on motor parameters, and thus, detection precision and system reliability are improved.

Description

technical field [0001] The invention relates to the field of motors, in particular to a soft measurement method for rotor speed and displacement of a bearingless permanent magnet synchronous motor based on an adaptive BP neural network, in order to realize real-time on-line control of the torque and radial suspension force of a bearingless permanent magnet synchronous motor Conditions are created for high-performance control of bearingless permanent magnet synchronous motors. Background technique [0002] Bearingless permanent magnet synchronous motor is a new type of motor that combines the characteristics of permanent magnet synchronous motor and magnetic bearing. It not only has the advantages of high power factor, high efficiency and high power density of permanent magnet synchronous motor, but also has the advantages of no mechanical friction of magnetic bearing , no lubrication and maintenance-free, etc., can realize high-speed or ultra-high-speed operation, and has po...

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Application Information

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IPC IPC(8): H02P21/00H02P21/18H02P21/24H02P25/022G06N3/04G06N3/08G01D21/02
CPCH02P21/0014H02P21/18H02P21/24H02P21/0017H02P25/022G06N3/084G01D21/02H02P2207/05G06N3/048
Inventor 郝正强杨阳徐世文
Owner HANGZHOU ZHOUJU ELECTRONICS TECHNOLOGICAL
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