Outdoor fan drag control method against wind
An outdoor fan, drag angle technology, applied in pump control, machine/engine, mechanical equipment and other directions, can solve the problem of no public outdoor fan upwind drag control method, inability to realize fan upwind drag control, etc., to achieve upwind The effect of launch control
Active Publication Date: 2018-04-10
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology
[0003] The current technology, such as the patent "Control method and control device for driving outdoor fan of air conditioner, and air conditioner with it (201410183282.3)", does not disclose the control method of driving the outdoor fan against the wind under the condition that the motor is in reverse operation before starting, and cannot Realize the headwind drag control of the wind turbine
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[0019] The control method of the outdoor fan headwind dragging in this example is as follows: figure 1 and figure 2 shown, including the following steps:
[0020] a. The MCU obtains the phase voltage value between the three-phase electromotive force U / V / W and its center point N;
[0021] b. MCU obtains the motor speed f according to the phase voltage value of the three-phase electromotive force U / V / W r and its position θ;
[0022] c. The MCU goes through a low-pass filter to control the dragging current from 0 to the reverse dragging target current I;
[0023] d. At the same time, the MCU experiences the first dragging time, controls the dragging angle from the first angle γ to 0, controls the d-axis dragging current from 0 to Icosγ, and finally changes to the reverse dragging target current I, and controls the q-axis at the same time The dragging current changes from 0 to Isinγ and finally to 0, and the number of revolutions of the motor is controlled from the first reve...
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The invention relates to an outdoor fan, and provides a method for detecting and controlling positive / negative rotation of the outdoor fan during upwind running aimed at a problem of no public method for detecting positive / negative rotation of a motor in the prior art. The method comprises the following steps: firstly, obtaining a phase voltage value of three-phase counter electromotive force by a system; secondly, according to change of the phase voltage value of the three-phase counter electromotive force, obtaining a zero-crossing time sequence of the phase voltage of the three-phase counter electromotive force by the system; finally, according to a time sequence change mode of the phase voltage value of the three-phase counter electromotive force, judging positive / negative rotation of the motor. Through the method for detecting and controlling positive / negative rotation of the outdoor fan during upwind running, information whether the motor is in a positive or negative rotation state can be correctly obtained; the method is used for detecting a running condition of the outdoor fan after the outdoor fan receives a startup command; according to the running condition of the outdoor fan, a single-chip microcomputer judges whether the outdoor fan needs to be started after being controlled to be in a positive rotation state or not, so that upwind running control of the outdoor fan is realized. The method is suitable for testing the outdoor fan.
Description
technical field [0001] The invention relates to an outdoor fan, in particular to a control method for the outdoor fan. 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 rotation, the controller needs to detect the position, speed and direction of rotation of the motor, and perform corresponding start-up control according to the operation of the motor in a timely manner, so as to achieve the purpose of correctly controlling the operation of the motor. [0003] The current technology, such as the patent "Control method and control device for driving outdoor fan of air conditioner, and air conditioner with it (201410183282.3)", does no...
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IPC IPC(8): H02P6/22
CPCF04D27/001H02P6/22
Inventor 陈跃刘启武涂小平朱绯高向军王声纲赵鹏飞
Owner SICHUAN CHANGHONG ELECTRIC CO LTD