Control method for multi-stator arc-shaped motor of large telescope

A technology of arc motor and control method, applied in electronic commutation motor control, motor generator control, control system, etc., to reduce torque fluctuation, improve tracking accuracy, and meet the effect of low-speed and high-precision rotation

Inactive Publication Date: 2014-09-10
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of large torque fluctuations in multi-stator arc motors, and prov

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  • Control method for multi-stator arc-shaped motor of large telescope
  • Control method for multi-stator arc-shaped motor of large telescope
  • Control method for multi-stator arc-shaped motor of large telescope

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0019] The actual output torque of multi-stator motor mainly includes two parts, electromagnetic torque and disturbance torque. The disturbance torque here mainly refers to the reluctance torque of the motor itself. Assuming that the motor winding does not contain high-order harmonics and the air-gap flux density of the motor is a sine wave, the electromagnetic torque output by the motor is a constant value. The reluctance torque of the motor is related to its own structure and is generally a function of periodic fluctuations. When using vector control, there is a linear relationship between the electromagnetic torque of the motor and the quadrature axis current. Since the reluctance torque is a periodic function of the...

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Abstract

The invention relates to a control method for a multi-stator arc-shaped motor of a large telescope. The control method mainly comprises the following steps that firstly, detent force of the arc-shaped motor is measured, and the magnitudes of the detent force at different positions are obtained; secondly, Fourier nonlinear regression analysis is conducted on obtained position-following detent force change information, and a position-following detent force magnitude change expression of the motor is obtained; thirdly, CLARKE conversion and PARK conversion are conducted on collected three-phase current to obtain direct-axis current id and quadrature-axis current iq; fourthly, a detent force expression obtained through fitting is divided by the moment coefficient of the motor to obtain a position-following compensation current expression; fifthly, in a quadrature-axis current ring, theoretical reference current I*qv is subtracted by compensation current Iqr to obtain actual quadrature-axis reference current I*q. According to the a control method for the multi-stator arc-shaped motor of the large telescope, torque fluctuation, caused by the end effect, of the arc-shaped motor can be eliminated to a large extent, and the requirement for low-speed high-precision rotation of the motor is met.

Description

technical field [0001] The invention belongs to the field of electromechanical control, in particular to a multi-stator arc motor control method for reducing the size of a large telescope through magnetic resistance compensation. Background technique [0002] With the development of science and technology, the size of modern photoelectric detection equipment is getting bigger and bigger. For example, the size of the latest foreign astronomical telescope has reached 30m-50m. The previous transmission system can no longer meet the moment of inertia and mechanical stiffness required by these photoelectric detection devices. According to the traditional telescope design scheme, the diameter of the directly driven torque motor that needs to be adopted will reach more than 10m. This will bring great trouble to the processing and transportation of the motor. Aiming at this problem, a new multi-stator arc motor drive method has been applied. This kind of motor is composed of mult...

Claims

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Application Information

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IPC IPC(8): H02P21/05
Inventor 常九健马文礼
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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