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A brushless motor-based fan startup control method and control device

A brushless motor and drive control technology, applied in electromechanical devices, components of pumping devices for elastic fluids, pump devices, etc., can solve problems such as motor damage, inability to recognize the position of the fan rotor, and inability to start the motor normally. , to reduce the damage rate and ensure the effect of normal operation

Active Publication Date: 2021-06-01
SHANGHAI YINGHENG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Start the fan in the same direction (downwind) or in the opposite direction (upwind), because the fan is blown, the controller cannot recognize the position of the fan rotor, and the traditional motor control algorithm cannot start and run the motor normally, and even cause damage to the motor

Method used

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  • A brushless motor-based fan startup control method and control device
  • A brushless motor-based fan startup control method and control device
  • A brushless motor-based fan startup control method and control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] figure 1 It is a schematic flow chart of the brushless motor-based fan startup control method provided by Embodiment 1 of the present invention, as shown in figure 1 As shown, the brushless motor-based fan startup control method includes:

[0060] S110, obtaining the three-phase electromotive force of the brushless motor;

[0061] Before the software design, obtain the three opposite electromotive forces, and use an oscilloscope to measure the Ke value of the back electromotive force coefficient of the brushless motor (V / speed, the voltage value of the back electromotive force generated at unit speed), and the software uses ADC sampling to obtain the three phases when the rotor rotates freely. The terminal voltage u generated by the phase stator a , u b and u c And satisfy:

[0062] u a + u b + u c =0. (1)

[0063] S120, respectively determine the rotation direction and the rotation speed of the brushless motor rotor according to the three opposite electromoti...

Embodiment 2

[0069] exist figure 1 Based on the example shown, the figure 2 It is a schematic flowchart of another brushless motor-based fan startup control method provided by Embodiment 2 of the present invention. Such as figure 2 As shown, the process of determining the rotation direction of the brushless motor rotor includes:

[0070] S211. Calculate the sector value of the rotor of the brushless motor in one sector period according to the three-phase electromotive force.

[0071] Assume that the obtained three opposite electromotive forces are u a , u b and u c , and the three-phase electromotive force u a , u b and u c satisfy:

[0072] u a + u b + u c = 0; (1)

[0073] Define three variables A, B and C, then:

[0074] if u a >0, A=1, otherwise A=0;

[0075] if u b >0, B=1, otherwise B=0;

[0076] if u c >0, C=1, otherwise C=0;

[0077] Then the sector value N=4*C+2*B+A.

[0078] S212. Determine the rotation direction of the rotor of the brushless motor accordin...

Embodiment 3

[0107] exist figure 1 Based on the example shown, the Figure 4 The schematic flow chart for controlling the start-up of the brushless motor provided by Embodiment 3 of the present invention, as shown in Figure 4 As shown, the process of controlling the start of the brushless motor includes:

[0108] S400, obtaining the three-phase electromotive force of the brushless motor;

[0109] S410, respectively determine the rotation direction and the rotation speed of the brushless motor rotor according to the three opposite electromotive forces.

[0110] S420. Determine a drive control signal of the brushless motor according to the rotation speed of the rotor of the brushless motor.

[0111] Wherein, the process of determining the drive control signal of the brushless motor includes: calculating the duty cycle information of the drive control signal according to the counter electromotive force of the brushless motor.

[0112] S430. Control the brushless motor to turn on accordin...

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Abstract

The invention discloses a fan starting control method and control device based on a brushless motor, comprising: obtaining three-phase electromotive force of the brushless motor; The rotation direction and rotation speed of the motor rotor control the turning on of the brushless motor. The invention determines the rotation direction and the rotation speed of the rotor of the brushless motor, so that the motor can control the start of the fan under the condition of downwind or headwind, so as to ensure the normal operation of the motor.

Description

technical field [0001] The embodiments of the present invention relate to the field of fan startup control, and in particular, to a brushless motor-based fan startup control method and control device. Background technique [0002] Brushless motors in vehicle fans are gradually replacing brushed motors due to their advantages of high efficiency, fast response and long service life. The control of brush motors is generally divided into two types: sensor and sensorless. Sensor control requires the installation of a position sensor in the motor to detect the position of the motor rotor, and the position sensor has strict requirements on the use environment. Sensorless control can be detected without a position sensor The position of the rotor is not affected by the environment in which the motor is located. Compared with the sensor motor control technology, the sensorless control technology saves the cost of the motor controller and has a wider use environment. It has been more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D25/08F04D27/00F04D29/00H02K7/14
CPCF04D25/08F04D27/008F04D29/002H02K7/14
Inventor 秦晨张奇毛黎明刘荣鹏
Owner SHANGHAI YINGHENG ELECTRONICS