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Direct-current brushless motor commutation position monitoring method

A brushless DC motor, high-speed motor technology, applied in the direction of monitoring commutation, generator control, motor generator control, etc., can solve the problems of unstable motor operation, inability to accurately determine the motor commutation position, etc., to ensure stability Effect

Pending Publication Date: 2022-02-25
NANJING LINKWAH TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For this reason, the present invention provides a method for monitoring the commutation position of a brushless DC motor to solve the problem that the commutation position of the existing motor cannot be accurately determined, resulting in unstable operation of the motor

Method used

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  • Direct-current brushless motor commutation position monitoring method
  • Direct-current brushless motor commutation position monitoring method
  • Direct-current brushless motor commutation position monitoring method

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Embodiment 1

[0048] This embodiment discloses a method for monitoring the commutation position of a DC brushless motor, which determines the optimum commutation position of the motor; the optimum commutation position when the current is an ideal square wave,

[0049]The control system uses a square wave current to drive the brushless DC motor. Let δ be the angle difference between the actual commutation position and the commutation position with a delay of 30 degrees. When δ is greater than 0, it is called lagging commutation, and when it is less than zero, it is called advanced commutation. Mutually. Taking the switching tube a+b- as an example, the conduction area is ωt∈(7π / 6+δ,3π / 2). According to the electromagnetic torque formula of the motor, one commutation cycle can be obtained when the motor speed is stable The average electromagnetic torque within

[0050]

[0051] make

[0052] θ=ωt (2)

[0053] According to the formula of the basic principle of the motor, we can get

[00...

Embodiment 2

[0083] This embodiment discloses an open-loop control method for the commutation position. First, determine the source of the commutation position error. The sensorless control of the high-speed motor controls the commutation by detecting the zero-crossing point of the terminal voltage (back electromotive force) of the non-conducting phase. Due to the terminal voltage The waveform of the terminal voltage will be disturbed by commutation, current ripple, etc., so it must be filtered. Typical terminal voltage filter circuits such as Figure 5 shown.

[0084] Due to the phase shift generated by the low-pass filter circuit, the actual detected terminal voltage will lag behind the actual value, and the lag angle is

[0085]

[0086] It can be seen from Equation 12 that the lag angle will increase as the motor speed increases. In addition, in actual operation, due to the processor's software calculation cycle and delay T s , there is also a delay T in the transmission of the si...

Embodiment 3

[0100] This embodiment discloses a commutation position closed-loop control method based on virtual neutral point voltage integration

[0101] The open-loop control of the commutation position calculates the filter phase shift and software and hardware delay corresponding to different speeds through the filter circuit parameters and experiments. In this off-line calculation method, the phase shift calculation only considers the fundamental wave of the counter electromotive force, and there is an error with the phase shift of the actual zero-crossing point; when the filter circuit changes, the wrong phase shift angle will be calculated; the software and hardware delay Time measurements and numerical calculations can also cause bias. However, open-loop control cannot suppress the influence of these deviations.

[0102] In the sensorless method with an external virtual neutral point, there is a fixed relationship between the waveform of the neutral point voltage and the actual c...

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Abstract

The invention discloses a direct-current brushless motor commutation position monitoring method. The method comprises the following steps of judging an optimal commutation position of a motor, calculating to obtain an ideal commutation position under two conditions of an ideal square wave and existence of a deviation angle, and performing simulation analysis; after an ideal commutation position is obtained, calculating and analyzing a commutation position open-loop control method, and performing open-loop correction on a high-speed motor commutation position error; and analyzing the relationship between the virtual neutral point voltage integral and the commutation position, and performing closed-loop control on the commutation position. The problem of unstable motor operation caused by the fact that the commutation position of an existing motor cannot be accurately judged is solved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for monitoring the commutation position of a DC brushless motor. Background technique [0002] When the PMSM is driven by a square wave, the operating characteristics of the motor are closely related to the commutation position. An unsatisfactory commutation position will cause the electromagnetic torque to decrease and the current harmonics to increase. In position sensorless control, terminal voltage detection filtering, software and hardware delays, etc. will cause the actual commutation position to deviate from the given commutation position. Due to the extremely short commutation period of high-speed motors, they are more sensitive to this commutation position error. Therefore, it is very important to control the motor to commutate accurately at the best position for the stable operation of the motor. Contents of the invention [0003] For this reason, the...

Claims

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Application Information

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IPC IPC(8): H02P21/24H02P6/08H02P6/12
CPCH02P21/24H02P6/08H02P6/12
Inventor 李娜
Owner NANJING LINKWAH TECH INC
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