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Counter electromotive force sum-based commutation optimization method of brushless DC motor

A technology of brushed DC motor and back electromotive force, which is applied in the direction of electronically commutated motor control, electrical components, control systems, etc., can solve the problems of inability to obtain absolutely accurate position information, deviation of rotor position information, and measurement error of motor design parameters, etc., to achieve The effect of improving accuracy and versatility, reducing the amount of calculation, and simplifying the optimization process

Active Publication Date: 2019-07-26
哈尔滨市新量能电气技术有限公司
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Problems solved by technology

However, any position sensorless control method cannot obtain absolutely accurate position information, and measurement errors of motor design parameters, detection errors of motor operation, and changes in the external environment will cause deviations in the extracted rotor position information.

Method used

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  • Counter electromotive force sum-based commutation optimization method of brushless DC motor
  • Counter electromotive force sum-based commutation optimization method of brushless DC motor
  • Counter electromotive force sum-based commutation optimization method of brushless DC motor

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Embodiment Construction

[0023] The application is further described below in conjunction with accompanying drawing:

[0024] Such as figure 1 As shown, a kind of brushless DC motor commutation optimization strategy based on the sum of back electromotive force of the present embodiment, its steps are as follows:

[0025] Step 1: Since the values ​​at two adjacent three-quarter moments are equal in size and opposite in direction, and the value at this moment is an intermediate value, neither too large nor too small, so collect the data of each conduction of the brushless DC motor. The value of the non-conduction opposite electromotive force at the three-quarters of the conduction state, such as figure 1 As shown, taking phase A as a non-conducting phase as an example, at the three-quarters of the conduction phase of CB, the opposite electromotive force e of A is collected a1 , at the three quarters of the BC conduction phase, collect the opposite electromotive force e of A a2 .

[0026] Step 2: Add...

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Abstract

The invention relates to a counter electromotive force sum-based commutation optimization method of a brushless DC motor, and belongs to the field of motor control. The counter electromotive force sum-based commutation optimization method is used for solving the problem of large rotor position information deviation of a position sensorless motor in the prior art during position detection. The counter electromotive force sum-based commutation optimization method comprises the steps of acquiring a non-conduction phase counter electromotive force value of the brushless DC motor in each conductionstate at three fourth moment; adding numerical values of the acquired non-conduction phase counter electromotive forces in two adjacent conduction states to obtain non-conduction phase counter electromotive force sum; performing PI regulation on the non-conduction phase counter electromotive force sum to obtain duty ratio adjustment quantity; not allowing to adjust when the non-conduction phase counter electromotive force sum is zero; increasing a duty ratio when the non-conduction phase counter electromotive force sum is smaller than zero; and reducing the duty ratio when the non-conductionphase counter electromotive force sum is larger than zero. By the counter electromotive force sum-based commutation optimization method, the motor commutation accuracy is improved, no extra hardware circuit is needed, and high universality and low calculation quantity are achieved.

Description

technical field [0001] A motor commutation optimization method belongs to the technical field of motor control, and in particular relates to a brushless direct current motor commutation optimization method based on a counter electromotive force sum. Background technique [0002] In recent years, brushless DC motors have become more and more widely used in the industrial field due to their high reliability, strong anti-interference ability and high efficiency. Traditional brushless DC motors use position sensors to obtain the rotor position, thereby realizing wireless Commutation of brushed DC motors, but the reliability of position sensors is not high and is easily affected by the external environment, which reduces the efficiency of brushless DC motors. Therefore, the development of control strategies for brushless DC motors without position sensors is of great significance. [0003] In the control strategy of brushless DC motor without position sensor, the accuracy of roto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/182
CPCH02P6/182
Inventor 于德亮魏群赵鹏舒刘冬
Owner 哈尔滨市新量能电气技术有限公司
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