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Off-line identification method of motor q-axis inductance

An identification method and shaft inductance technology are applied in the field of off-line identification of the q-axis inductance of air-conditioning motors to achieve the effect of reducing costs

Active Publication Date: 2019-02-15
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that EEPROM needs to be used in the current air conditioner to store the q-axis inductance parameters of the motor, and provides an off-line identification method for the q-axis inductance of the motor

Method used

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  • Off-line identification method of motor q-axis inductance
  • Off-line identification method of motor q-axis inductance
  • Off-line identification method of motor q-axis inductance

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Embodiment

[0042] The method for offline identification of the q-axis inductance of a motor according to an embodiment of the present invention includes the following steps:

[0043] Step 1. Control the motor rotor to rotate to the direction of the fixed coordinate axis α axis.

[0044] In this step, the method of controlling the rotation of the motor rotor to the direction of the fixed coordinate axis α axis can be:

[0045] Step 101: Control the inverter to select the U-phase upper bridge arm IGBT control terminal to input the first PWM wave, and make it in a PWM cycle, first turn on the upper bridge arm, when the upper bridge arm is turned on, the other upper The bridge arm is turned off. The current flows from the DC bus voltage through the upper bridge IGBT into the corresponding coil of the motor, and then flows out from the other two phases of the motor and the lower bridge IGBT connected to it. The current is turned off during the remaining time of the current PWM wave cycle. For all t...

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Abstract

The invention relates to an air conditioner technology, aims to solve the problem that a motor q-axis inductance parameter is stored by using EEPROM in an existing air conditioner, and provides a motor q-axis inductance offline identification method. Through the technical scheme, the method comprises the following steps: firstly controlling a motor rotor to rotate in the direction of alpha axis of a fixed coordinate axis, then controlling an inverter to select a bridge arm IGBT control end on a U phase to input a first PWM wave, sampling the value of current flowing in motor U phase after the phase current flows in the U phase, turning off the output of the first PWM wave, waiting until the phase current of the current U phase is 0, controlling the motor rotor to rotate in the direction of beta axis of the fixed coordinate axis, then inputting the first PWM wave again, collecting the value of the current flowing in the motor U phase at the moment and corresponding sampling time before the phase current flowing in the U phase is stabilized, and finally calculating a q-axis inductance value. The method has the beneficial effect that the motor q-axis inductance is stored without the need of the EEPROM, and the method is applicable to motors.

Description

Technical field [0001] The present invention relates to air conditioning technology, in particular to the technology of off-line identification of the q-axis inductance of an air conditioning motor. Background technique [0002] The inverter motor control technology in the traditional air conditioner requires the motor manufacturer to provide parameters such as q-axis inductance, which is determined by the motor control model Determined, where r is the phase resistance of the motor, L d , L q Are the motor d-axis inductance and q-axis inductance, K E Is the constant of back electromotive force of the motor, ω is the current angular velocity of the motor, V d , V q Are motor d-axis voltage and q-axis voltage respectively, I d , I q These are the d-axis current and the q-axis current of the motor. When it is necessary to control a large number of different motors, the motor parameters are often stored in similar EEPROM, leaving the control program unchanged, which can solve the con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 陈跃涂小平刘启武唐婷婷程远银任艳华高向军
Owner SICHUAN CHANGHONG ELECTRIC CO LTD