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Sensorless accurate commutation method and device of brushless DC motor

A brushless DC motor and sensor technology is applied in the field of sensorless precise commutation of brushless DC motors, which can solve the problems of misjudging the commutation signal by a single chip, reducing the operating efficiency and control performance of the system, and achieving stable operation and improving operation. Efficiency and stability, the effect of high system accuracy

Inactive Publication Date: 2018-09-28
张懿
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  • Application Information

AI Technical Summary

Problems solved by technology

In the actual commutation process, there is inductive energy storage on the switched-off phase to generate freewheeling, so that a completely opposite electromotive force is generated on the winding of this phase. After the inductive energy storage of this phase is consumed, the phase The electromotive force on the circuit is completely only generated by the winding cutting the magnetic force line. Since the energy storage of the inductor is consumed quickly, the port voltage of the turned-off phase will generate a voltage pulse before the jump edge, and this voltage pulse is easily misjudged by the microcontroller as commutation signal, resulting in early commutation, which greatly reduces the operating efficiency and control performance of the system

Method used

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  • Sensorless accurate commutation method and device of brushless DC motor
  • Sensorless accurate commutation method and device of brushless DC motor

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Embodiment Construction

[0024] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] The present invention provides a device for accurate phase commutation of a brushless DC motor without a sensor, which is used for accurately judging the phase commutation time of the brushless DC motor and for accurately judging the phase commutation time of the brushless DC motor. The device includes a DC power supply, Three-phase bridge inverter, new winding, three voltage acquisition devices and single-chip microcomputer, among them, the DC power supply is connected in parallel with the three-phase bridge inverter, and the three output ends of the three-phase bridge inverter are respectively connected to the brushless DC The A-phase, B-phase, and C-phase ports of the new winding of the motor are connected correspondingly; the input ends of the three voltage acquisition devices are respectively connected to the ports of A-phase, B-...

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Abstract

The invention discloses a sensorless accurate commutation method and device of a brushless DC motor. The sensorless accurate commutation method comprises the steps of respectively connecting an A-phase voltage line, a B-phase voltage line and a C-phase voltage line of the brushless DC motor to corresponding voltage acquisition devices, triggering commutation service interrupt by jump edges of induction voltage waveforms of three phases A, B and C; entering commutation service interrupt if the jump edges are descending edges, and changing states of corresponding MOS tubes and IGBTs to achieve commutation after delaying by 30 electrical angels; performing triggering by ascending edges if the jump edges are ascending edges, starting to count in a circulation way from 0, entering commutation service interrupt when a counting value is 2, changing the states of the corresponding MOS tubes and IGBTs to achieve commutation after delaying by 30 electrical angels, and resetting the counter. Thecommutation method has the advantages of high interrupt service trigger and good reliability, a commutation misjudgment accident of the brushless DC motor is prevented under the interference of a demagnetization accident, and the commutation moment is scientifically and simply judged.

Description

technical field [0001] The invention relates to the technical field of brushless direct current motors, in particular to a method and device for accurate phase commutation of brushless direct current motors without sensors. Background technique [0002] In the square wave control strategy of the brushless DC motor, two phases of the motor are turned on and one phase is turned off at each moment. In the actual commutation process, there is inductive energy storage on the switched-off phase to generate freewheeling, so that a completely opposite electromotive force is generated on the winding of this phase. After the inductive energy storage of this phase is consumed, the phase The electromotive force on the circuit is completely only generated by the winding cutting the magnetic force line. Since the energy storage of the inductor is consumed quickly, the port voltage of the turned-off phase will generate a voltage pulse before the jump edge, and this voltage pulse is easily ...

Claims

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Application Information

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IPC IPC(8): H02P6/18H02P6/12
CPCH02P6/18H02P6/12
Inventor 张懿
Owner 张懿
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