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Method and system for positionless phase commutation of brushless DC motor suitable for variable speed conditions

A brushless DC motor and working condition technology, applied in the field of brushless DC motor positionless commutation method and system, can solve the problems of brushless DC motor commutation error, feedback signal distortion, error error compensation, etc., and achieve accurate closed loop Effect of controlling and eliminating commutation error and improving accuracy

Active Publication Date: 2022-04-08
NINGBO INST OF TECH BEIHANG UNIV +1
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Problems solved by technology

[0003] However, in the case of variable speed of the brushless DC motor, the symmetry and periodicity of the motor signal will change, and the feedback signal will also be distorted. The commutation error caused by the distortion of the feedback signal is introduced into the system, which seriously affects the commutation of the brushless DC motor. The accuracy of the brushless DC motor, that is, the change of the speed of the brushless DC motor will cause the distortion of the feedback signal, resulting in wrong error compensation, which will cause errors in the commutation of the brushless DC motor

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  • Method and system for positionless phase commutation of brushless DC motor suitable for variable speed conditions
  • Method and system for positionless phase commutation of brushless DC motor suitable for variable speed conditions
  • Method and system for positionless phase commutation of brushless DC motor suitable for variable speed conditions

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[0044] In order to more clearly understand the above objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, in the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0045] In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways than described here; obviously, the embodiments in the description are only some of the embodiments of the present disclosure, and Not all examples.

[0046] figure 1 A schematic flowchart of a positionless phase commutation method for a brushless DC motor suitable for variable speed conditions provided by an embodiment of the present disclosure. The brushless DC motor positionless phase commutation method suitable for variable speed conditio...

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Abstract

The disclosure relates to a method and system for positionless phase commutation of a brushless DC motor suitable for variable speed conditions. The phase commutation method includes obtaining three-phase electromotive force signals of a brushless DC motor under variable speed conditions; obtaining three-phase Virtual Hall signal; obtain the feedback signal and sample the feedback signal before and after the commutation point of the three-phase virtual Hall signal to obtain the feedback amount; perform a closed-loop PI control algorithm to control the commutation of the brushless DC motor according to the feedback amount. Through the technical solution of the present disclosure, while effectively realizing the closed-loop control of the commutation error of the brushless DC motor, it can effectively eliminate the commutation error caused by the distortion of the feedback amount under the variable speed condition, and improve the efficiency of the brushless DC motor under the variable speed condition. The accuracy of positionless commutation enables accurate closed-loop control of commutation errors in both constant and variable speeds of brushless DC motors.

Description

technical field [0001] The present disclosure relates to the field of motor technology, in particular to a method and system for positionless commutation of a brushless DC motor suitable for variable speed conditions. Background technique [0002] In the existing commutation method based on a symmetrical signal closed-loop, the commutation signal is obtained after delaying the back-EMF zero-crossing point, and the closed-loop feedback value constructed can be the back-EMF voltage deviation, current deviation, voltage integral deviation or current integral deviation, etc. Since the back electromotive force and current of the motor are usually symmetrical and periodic, the feedback amount is equal to zero when the commutation of the brushless DC motor is accurate. When there is a commutation error, this symmetry is broken, the feedback amount is no longer zero, and there is a positive correlation between the feedback amount and the commutation error. By establishing a closed-l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/182
CPCH02P6/182
Inventor 刘刚金浩郑世强李海涛毛琨董宝田
Owner NINGBO INST OF TECH BEIHANG UNIV
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