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A Speed ​​Estimation Method of Bearingless Asynchronous Motor

A technology for asynchronous motor and speed estimation, which is applied in the control of generators, motor generators, electronically commutated motors, etc. It can solve the problems of inaccurate speed identification and achieve the effect of improving identification accuracy and accurate real-time speed values

Active Publication Date: 2019-02-05
江阴智产汇知识产权运营有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a bearingless asynchronous motor speed detection system and method based on POPOV ultra-stability to solve the problem of inaccurate speed identification of the current bearingless asynchronous motor, and can observe the rotor flux linkage and identification speed of the bearingless asynchronous motor online

Method used

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  • A Speed ​​Estimation Method of Bearingless Asynchronous Motor
  • A Speed ​​Estimation Method of Bearingless Asynchronous Motor
  • A Speed ​​Estimation Method of Bearingless Asynchronous Motor

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0027] see figure 1 , the strong current part, the three-phase AC power supply is uncontrolled rectified to obtain the DC bus voltage u dc , to supply the voltage source inverter, and then obtain the three-phase power supply for the bearingless asynchronous motor.

[0028] The weak current part adopts vector control mode, including voltage and current sensors, 3-phase / 2-phase static coordinate transformation module, 2-phase static / 2-phase synchronous speed coordinate transformation module, new observer module, ordinary observer module, and speed calculation Module, control module, speed loop PI controller module, current loop PI controller module, 2-phase synchronous speed / 2-phase static coordinate transformation module, voltage space vector pulse width modulation module.

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Abstract

The invention discloses a rotary speed estimation method for a bearingless asynchronous motor, and provides a rotary speed detection system and method for the bearingless asynchronous motor and based on POPOV hyper-stability so as to solve the problem of inaccurate rotary speed identification of the current bearingless asynchronous motor. Two sets of rotor magnetic linkage voltage model observation values are obtained according to actually measured stator voltage and current signals through a magnetic linkage observer formed by a common integrator and a magnetic linkage observer formed based on an improved second-order generalized integrator; the observed rotor magnetic linkage is used as a reference value; and the rotor magnetic linkage is solved by a rotor magnetic linkage current model to be used as an adjustable value to form two sets of rotor magnetic linkage-based model reference adaptive systems (MRAS). Through a proper adaptive law, the rotary speed of the bearingless asynchronous motor is identified; then a proper rotary speed identification observer is controlled to be selected through a regulation and control module to obtain an accurate real-time rotary speed value; and the invention does not give unnecessary details on a suspension force control part of the bearingless asynchronous motor.

Description

technical field [0001] The invention is a speed estimation method of a bearingless asynchronous motor. The invention provides a new strategy for the speedless operation of a bearingless asynchronous motor, is suitable for a speed sensorless vector control scheme of a bearingless asynchronous motor, and belongs to the technical field of electric drive control equipment. Background technique [0002] At present, the control methods of three-phase asynchronous motors have become mature, and vector control and direct torque control can meet the requirements of most working conditions. Regardless of the control method, the rotational speed is a very important control quantity. But the speed sensor is difficult to install in some cases, or sometimes in order to save this part of the cost, people hope to identify the speed in real time and realize the speed sensorless control only according to the phase current and phase voltage data that are easily measured on the frequency conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/13H02P21/18H02P21/26
CPCH02P21/13
Inventor 孙宇新唐敬伟施凯吴昊阳沈启康陈宇超
Owner 江阴智产汇知识产权运营有限公司
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