Speed sensorless control method for bearing-free asynchronous motor

A speed sensorless, asynchronous motor technology, applied in motor generator control, electronic commutation motor control, control system, etc., can solve problems such as increased cost investment, high-frequency signal doping, complex control system, etc., to ensure stability The effect of suspension, simplification of structure, and promotion of miniaturization

Inactive Publication Date: 2017-06-13
JIANGSU UNIV
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Problems solved by technology

However, the injected high-frequency signal is easily mixed with other high-frequency harmonic signals, and it is not easy to separate. It is necessary to install an additional signal processing device, which makes the control system more complicated and increases the cost input, thus limiting the Bearingless asynchronous motors develop toward practical use

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  • Speed sensorless control method for bearing-free asynchronous motor
  • Speed sensorless control method for bearing-free asynchronous motor
  • Speed sensorless control method for bearing-free asynchronous motor

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0044] Such as figure 1 , a speed sensorless control method for a bearingless asynchronous motor, characterized in that it includes a suspension control process, an intermediate control process and a torque control process, wherein the suspension control process includes the following steps:

[0045] Step 1: Compare the radial displacement offset x, y of the bearingless asynchronous motor rotor measured by the eddy current sensor with the given radial displacement offset x of the rotor in the x, y direction * 、y * As the input of the comparator, its output value is adjusted by the PID controller to generate a given radial suspension force F of the rotor of the bearingless asynchronous motor in the x and y directions x * , F y * ;

[0046] Step 2: Set the given radia...

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Abstract

The invention discloses a speed sensorless control method for a bearing-free asynchronous motor. The method comprises the steps that a rotor position deviation angle is constructed by injecting current into two ends of a stator of the bearing-free asynchronous motor based on a fundamental wave model of the bearing-free asynchronous motor, further the deviation angle is adjusted through a PI controller to obtain motor air-gap magnetic field rotation speed, and motor rotation speed can be further estimated. The speed sensorless control method disclosed by the invention can accurately trace rotor rotation speed and avoids adverse effects of traditional mechanical type speed sensor installation to high-speed operation of the bearing-free asynchronous motor. The speed sensorless control method for the bearing-free asynchronous motor has the advantages of not depending on varieties of non-ideal characteristics of the motor, being difficult for other harmonic signals to guide in, being simple in structure, being convenient to engineering realization and the like.

Description

technical field [0001] The invention relates to the technical field of stability control in electric transmission, in particular to a speed sensorless control method for a bearingless asynchronous motor. Background technique [0002] In recent years, with the rapid development of industry, people's demand for motors is increasing and their requirements are getting higher and higher. Compared with other traditional motors, bearingless induction motors (bearingless induction motors, BIM) have the characteristics of no friction, no wear, no lubrication, corrosion resistance, long life, high-speed, ultra-high-speed operation, etc., and are widely used in regular maintenance Difficult life science fields, chemical fields susceptible to acid and alkali corrosion, and semiconductor industry and other fields. Because of its simple structure, uniform air gap, and low cost, it has a potential application market in special electrical drive / transmission fields such as machining, small ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18
Inventor 李方利杨泽斌孙晓东陈正张丹孙卫明
Owner JIANGSU UNIV
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