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Brushless direct-current motor position-free commutation method and system suitable for variable-speed working condition

A brushless DC motor and working condition technology, applied in the field of brushless DC motor positionless commutation methods and systems, can solve the problems of brushless DC motor commutation error, error compensation, feedback signal distortion, etc., to achieve accurate closed-loop Control, improve accuracy, eliminate the effect of commutation errors

Active Publication Date: 2020-11-24
NINGBO INST OF TECH BEIHANG UNIV +1
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  • Claims
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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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  • Brushless direct-current motor position-free commutation method and system suitable for variable-speed working condition
  • Brushless direct-current motor position-free commutation method and system suitable for variable-speed working condition
  • Brushless direct-current motor position-free commutation method and system suitable for variable-speed working condition

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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 invention relates to a brushless direct-current motor position-free commutation method and system suitable for a variable-speed working condition. The commutation method comprises the steps: obtaining a three-phase counter electromotive force signal of a brushless direct-current motor under the variable-speed working condition; acquiring a three-phase virtual Hall signal according to the three-phase counter electromotive force signal; obtaining feedback signals, and sampling the feedback signals before and after a three-phase virtual Hall signal commutation point to obtain feedback quantities; and performing a closed-loop PI control algorithm according to the feedback quantities to control commutation of the brushless direct current motor. According to the brushless direct-current motor position-free commutation method and system, the closed-loop control of the commutation error of the brushless direct current motor is effectively realized; phase change errors caused by feedback quantity distortion under the variable speed working condition can be effectively eliminated, the accuracy of position-free commutation of the brushless direct current motor under the variable speed working condition is improved, and accurate closed-loop control over the commutation errors can be achieved during constant speed and variable speed of the brushless direct current motor.

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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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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