Brushless direct current motor electronic speed governor based on STM32

Abstract

The invention discloses a brushless direct current motor electronic speed governor based on STM32, and the speed governor comprises an STM32 micro controller, a power driving circuit, a three-phase inverter circuit, a voltage and current monitoring circuit, a communication module circuit, a counter electromotive force detection circuit, an indicator circuit and the like; the STM32 micro controller drives the three-phase inverter circuit through the power driving circuit through an H-PWM-L-ON method, carries out connection and three-phase and six-state control on a motor, and synchronously detects a counter electromotive force zero-crossing signal among high-level intervals of pulse width modulation (PWM); the voltage of a three-phase end is converted through an analog-digital (AD) injection group method in the STM32 micro controller; the counter electromotive force zero-crossing signal is acquired by comparing corresponding end voltage and central point voltage in software; the AD injection group conversion is triggered by a TIM1_CC4 event; the power voltage, current and temperature detection is converted through a continuous circulating scanning method of an AD rule group and sent to the corresponding random-access memories (RAMs) through a direct memory access (DMA) channel; and compared with an the electronic speed governor which adopts a single-chip microcomputer, the brushless direct current motor electronic speed governor based on STM32 has the characteristics of higher anti-interference capability, small hardware space, higher performance and a plurality of communication methods.

Description

technical field [0001] The invention relates to an electronic governor of a brushless direct current motor, in particular to an electronic governor of a brushless direct current motor used in the field of model aircraft. Background technique [0002] In various aircraft models, the electronic governor is an important part of the aircraft model. It is mainly used to receive the control command signal of the aircraft model and adjust the speed according to the signal. The commonly used rotor position detection method of the existing sensorless brushless DC motor is The counter electromotive force zero-crossing detection method usually uses an electronic governor for detection. In the traditional electronic governor of aeromodelling, the controller basically uses a single-chip microcomputer. The running speed is not very high, and its counter electromotive force zero-crossing detection method is usually to use a voltage comparator to directly compare the phase voltage and the v...

AI Technical Summary

Problems solved by technology

[0002] In various aircraft models, the electronic governor is an important part of the aircraft model. It is mainly used to receive the control command signal of the aircraft model and adjust the speed according to the signal. The commonly used rotor position detection method of the existing sensorless brushless DC motor is The counter electromotive force zero-crossing detection method usually uses an electronic governor for detection. In the traditional electronic governor of aeromodelling, the controller basically uses a single-chip microcomputer. The running speed is not very high, and its counter electromotive force zero-crossing detection method is usually to use a voltage comparator to directly compare the phase voltage and the voltage of the virtual center point. The disadvantage of this detection method is that the anti-interference ability is weak, and certain False detection, some single-chip microcomputers do not even have their own voltage comparators, so it is necessary to expand the functional module, so that the space occupied by the hardware will become larger, which will increase the weight of the aircraft model, which will improve the performance and dexterity of the aircraft model. Unfavorable, the electronic governor with single-chip microcomputer as the controller still has the problem of a single communication method, which is not conducive to the extended use of the governor

Images