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Direct drag control method for outdoor fan of air conditioner

A technology for outdoor fans and air-conditioning rooms, which is applied in motor generator control, electronic commutation motor control, control systems, etc., can solve the problem of inability to realize direct drag control of fans, and achieve the effect of starting control.

Active Publication Date: 2015-07-15
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a direct drag control method of an outdoor fan, which is used to solve the problem that the direct drag control of the fan cannot be realized in the prior art

Method used

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  • Direct drag control method for outdoor fan of air conditioner
  • Direct drag control method for outdoor fan of air conditioner
  • Direct drag control method for outdoor fan of air conditioner

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Embodiment

[0028] The present invention solves its technical problem, and the technical solution adopted is that the single-chip microcomputer MCU obtains the motor speed f r and its position θ, such as figure 1 As shown, when the motor speed f r >0, when it is in a certain frequency range of forward operation, the motor speed is low at this time, the back electromotive force and the motor position detection error are large, and the positionless closed-loop control of the motor cannot be realized, and the control process of direct forward drag is required. Since the d / q axis current is 0 at this time, the d / q axis current needs to experience a slow change from 0. Therefore, the target current I will be dragged through the low-pass filter, and the output of the low-pass filter is I1, and I1 will be Starting from 0, slowly change to the drag target current I, after the first drag time T1, control the drag angle φ from 0, slowly change to the first angle γ, which is equivalent to controlli...

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Abstract

The invention relates to a direct drag control technology for an outdoor fan provided with a permanent magnetic synchronous direct-current motor, aims to solve a problem of incapability of realizing direct drag control of a fan in the prior art, and provides a direct drag control method for the outdoor fan of an air conditioner. The direct drag control method comprises the following specific steps: firstly, obtaining a rotational speed fr and a position theta of the motor, and when the rotational speed fr of the motor is more than 0, controlling drag current to change from 0 to target reverse drag current I through a low-pass filter, wherein output current of the low-pass filter is I1; secondly, within first drag time, controlling a drag angle phi to change from 0 to a target drag angle gamma, controlling d shaft driving current to change from 0 to target drag current Icos-gamma, controlling q shaft drag current to change from 0 to target drag current Isin-gamma, and controlling the rotational speed of the motor to change from current running frequency fr to target drag frequency f1; finally, switching to a position-sensorless control mode, and realizing positive drag start control of the motor. The direct drag control method is suitable for the permanent magnetic synchronous direct-current motor.

Description

technical field [0001] The invention relates to air-conditioning control technology, in particular to the direct-drag control technology of an outdoor fan of a permanent magnet synchronous DC motor. Background technique [0002] The permanent magnet synchronous DC brushless motor has a sine wave back electromotive force. When the permanent magnet synchronous DC brushless motor is used as the driving part of the outdoor fan of the air conditioner, due to sea breeze and other reasons, the outdoor fan motor may be in positive position before the air conditioner is started. Direction or reverse direction rotation, the controller needs to detect the position, speed and direction of rotation of the motor, based on which the corresponding start-up control is carried out in a timely manner according to the operation of the motor, so as to achieve the purpose of correctly controlling the operation of the motor. [0003] The current technology, such as the patent application with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00
Inventor 陈跃王声纲涂小平刘启武朱绯
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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