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A method for rotor flux observation and speed identification of bearingless asynchronous motor

A technology for rotor flux linkage and asynchronous motors, which is applied in the control of generators, motor generators, and electronically commutated motors. effect of error

Active Publication Date: 2019-03-05
江阴智产汇知识产权运营有限公司
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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 method for rotor flux observation and speed identification of bearingless asynchronous motor
  • A method for rotor flux observation and speed identification of bearingless asynchronous motor
  • A method for rotor flux observation and speed identification of bearingless asynchronous motor

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Embodiment Construction

[0029] 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.

[0030] see figure 1 The strong current part of 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. 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.

[0031] Th...

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Abstract

The invention discloses a rotor flux linkage observation and rotation speed recognition method for a bearing-free asynchronous motor, provides a rotation speed detection system and method for the bearing-free asynchronous motor based on POPOV superstability and aims at solving the problem that existing bearing-free asynchronous motor rotation speed recognition is inaccurate. A rotor flux linkage voltage model observation value can be obtained through a flux linkage observer which is formed by an improved second-order generalized-frequency self-adaption integrator according to measured stator voltage and current signals, observed rotor flux linkage serves as a reference value, rotor flux linkage solved through a rotor flux linkage current model serves as an adjustable value, and a model reference adaptive system (MRAS) based on the rotor flux linkage can be formed. The real-time rotation speed of the bearing-free asynchronous motor can be accurately recognized through an appropriate self-adaption law.

Description

technical field [0001] The invention relates to a speed identification 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 fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/13H02P21/14H02P21/18H02P21/24
CPCH02P21/0017H02P21/13H02P21/141
Inventor 孙宇新唐敬伟施凯吴昊阳
Owner 江阴智产汇知识产权运营有限公司
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