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Motor q-axis inductance offline identification method and system

An identification method and shaft inductance technology, which are applied in the estimation/correction of motor parameters, etc., can solve problems such as inability to realize compressor control.

Inactive Publication Date: 2017-09-08
SICHUAN HONGMEI INTELLIGENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after a certain period of time, the parameters of the compressor may change, so the parameters of the q-axis inductance stored in the memory cannot realize the control of the compressor

Method used

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  • Motor q-axis inductance offline identification method and system
  • Motor q-axis inductance offline identification method and system
  • Motor q-axis inductance offline identification method and system

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Embodiment Construction

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection of the present invention. scope.

[0045] Such as figure 1 As shown, the embodiment of the present invention provides an off-line identification method for the q-axis inductance of a motor, and the method may include the following steps:

[0046] Step 101: Using PWM waves to control the motor rotor to rotate to the direction of the fixed coordinate axis α-axis, and control the motor rot...

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Abstract

The invention provides a motor q-axis inductance offline identification method and system. The motor q-axis inductance offline identification method comprises the steps of S1, adopting PWM wave to control a motor rotor to rotate to an alpha-axis direction of a fixed coordinate axis, and controlling the motor rotor to be motionless; S2, after the motor phase current is stable, collecting a phase current which flows to the U phase of the motor; S3, adopting PWM wave to control the motor rotor to rotate to a 270-degree direction, waiting for the motor stable state, and then closing the PWM wave; S4, when it is determined that the motor coil current is 0, re-adopting PWM wave to control the motor rotor to rotate to the alpha-axis direction of the fixed coordinate axis, and controlling the motor rotor to be motionless, before the current is stable, collecting the current on the alpha axis of the motor and the corresponding time, wherein the current on the alpha axis is the current at present; and S5, determining the motor q-axis inductance according to the collected q-axis current at present and the corresponding time and the U-phase phase current. By virtue of the scheme, the cost is lowered, and q-axis inductance can be identified offline so as to realize control of different compressors.

Description

technical field [0001] The invention relates to the field of electromechanical technology, in particular to an off-line identification method and system for q-axis inductance of a motor. Background technique [0002] Traditional variable frequency motor control technology requires the motor manufacturer to provide the parameters of the q-axis inductance, which is determined by the motor control model. Usually, the parameters of the q-axis inductance are stored in the memory, and the control program remains unchanged. When controlling different compressors, it is only necessary to read the parameters of the q-axis inductance in the memory. However, after a certain period of time, the parameters of the compressor may change. In this way, the parameters of the q-axis inductance stored in the memory cannot realize the control of the compressor. Therefore, it is urgent to provide an off-line identification method for the q-axis inductance of the motor, so as to realize the contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/14
CPCH02P23/14
Inventor 任艳华唐婷婷陈跃
Owner SICHUAN HONGMEI INTELLIGENT TECH CO LTD
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