Commutation system and commutation method of high-speed brushless direct current motor

Abstract

The embodiment of the invention discloses a commutation system and a commutation method of a high-speed brushless direct current motor. The commutation system comprises an enable signal generation circuit, a window generation circuit, a feedback quantity acquisition circuit and a control circuit. The input end of the feedback quantity acquisition circuit is electrically connected with a three-phase winding and a neutral point of the motor, the enabling end of the feedback quantity acquisition circuit is electrically connected with the output end of the enabling signal generation circuit, and the control end of the feedback quantity acquisition circuit is electrically connected with the output end of the window generation circuit; the feedback quantity acquisition circuit is used for forming a reconstructed suspended back electromotive force according to the enable signal, the window signal, the three-phase terminal voltage and the neutral point voltage, and acquiring a feedback quantity; the feedback input end of the control circuit is electrically connected with the output end of the feedback quantity acquisition circuit, the signal input end of the control circuit is electrically connected with a virtual Hall signal, and the output end of the control circuit is electrically connected with the input end of the window generation circuit; and the control circuit is used for generating a commutation signal according to the feedback quantity and the virtual Hall signal.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a phase commutation system and a phase commutation method of a high-speed brushless DC motor. Background technique [0002] The brushless DC motor commutation method can use three-way Hall signals or encoders to form six-way commutation signals through the combination of high and low levels. However, the installation of position sensors not only increases the power consumption of the system, but also reduces the reliability of the system. , so the commutation method without position sensor has become a research hotspot in recent years. As a commutation method without a position sensor, the back electromotive force zero-crossing method is widely used in industry because of its simplicity and reliability. A commutation method of the area integral method is proposed. [0003] In the prior art, the commutation of the area integration method generally requires high-frequency sampling...

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Problems solved by technology

[0002] The brushless DC motor commutation method can use three-way Hall signals or encoders to form six-way commutation signals through the combination of high and low levels. However, the installation of position sensors not only increases the power consumption of the system, but also reduces the reliability of the system. , so the commutation method without position sensor has become a research hotspot in recent years

As a commutation method without a position sensor, the back electromotive force zero-crossing method is widely used in industry because of its simplicity and reliability. commutation method of area integral method

[0003] In the prior art, the commutation of the area integration method generally requires high-frequency sampling of the signal. The sampling circuit is implemented based on software. Since the electrical cycle of the motor is very small when the motor is running at high speed, the sampling density of the integrated signal is low. It will cause the sampling accuracy to drop, cause the calculation of the area to be inaccurate, and lead to commutation errors

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