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Control method of permanent magnet synchronous motor (PMSM) for frequency conversion refrigerator

A technology of permanent magnet synchronous motor and frequency conversion refrigerator, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., to improve energy efficiency and realize the effect of PMSM speed regulation control.

Active Publication Date: 2014-11-05
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem solved by the present invention is to propose a method for controlling PMSM for the PMSM control system currently used in frequency conversion refrigerators

Method used

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  • Control method of permanent magnet synchronous motor (PMSM) for frequency conversion refrigerator
  • Control method of permanent magnet synchronous motor (PMSM) for frequency conversion refrigerator
  • Control method of permanent magnet synchronous motor (PMSM) for frequency conversion refrigerator

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Embodiment Construction

[0016] Describe technical scheme of the present invention in detail below:

[0017] The network information verification method of the present invention, the main steps are: start the frequency conversion refrigerator, the permanent magnet synchronous motor starts to work after the system initialization; set the operating speed of the permanent magnet synchronous motor according to the target temperature of the frequency conversion refrigerator refrigeration; Get the i in the running of the permanent magnet synchronous motor α , i β ; The control module according to the obtained i α , i β Calculate the back electromotive force of the permanent magnet synchronous motor, and obtain the rotor angle position; when the frequency conversion refrigerator is close to the target temperature, the speed control of the permanent magnet synchronous motor is carried out according to the position of the rotor rotation angle, so that the frequency conversion refrigerator enters the fine-tun...

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Abstract

The invention relates to a motor control technology, in particular to a control method of a permanent magnet synchronous motor (PMSM) for a frequency conversion refrigerator. The invention provides a method which is used to control the PMSM. The control method of the PMSM for the frequency conversion refrigerator includes that the frequency conversion refrigerator is started, the PMSM begins to work after system initialization, operating speed of the PMSM is set according to target cooling temperature of the frequency conversion refrigerator, a current of the PMSM is obtained in real time through a current detection module, counter electromotive force of the PMSM is calculated and obtained according to obtained current, the corner position of a rotor is obtained, and lastly the PMSM is adjusted and controlled in speed according to the corner position of the rotor so that the frequency conversion refrigerator enters into a fining adjustment mode. The control method of the PMSM for the frequency conversion refrigerator has the advantages that a full-order observer which is used in a sensorless PMSM for the frequency conversion refrigerator is cancelled, energy efficiency is greatly improved, redundant circuit is not increased, and adjustment and control in speed for sensorless PMSM are achieved. The control method of the permanent magnet synchronous motor for the frequency conversion refrigerator is applied to the frequency conversion refrigerator.

Description

technical field [0001] The invention relates to motor control technology, in particular to a permanent magnet synchronous motor control method used in frequency conversion refrigerators. Background technique [0002] Inverter refrigerators can perform frequency conversion adjustment according to the target cooling temperature to achieve better cooling effect. Current inverter refrigerators use permanent magnet synchronous motors (PMSM). Provide rotor position information, and the presence of sensors reduces the reliability of the system and increases the cost of the system. Therefore, the use of sensorless PMSM has gradually become a trend in the field of motor control. At present, the common practice is to apply the full-dimensional observer to the sensorless PMSM to estimate the counter electromotive force and obtain the rotor angle position, but because the control system of the sensorless PMSM There are four state variables, so obtaining its rotor angle position is very...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/13
Inventor 唐婷婷潘军刘启武
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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