Three-phase servo motor based on CAN bus and ARM

Abstract

The invention discloses a three-phase brushless direct current motor control system based on a CAN (controller area network) bus and an ARM (advanced reduced instruction set computer machine). The system is used for monitoring a running condition of a motor in real time, and comprises a power supply module, a control module, a driver module, a protection module, a sensing module, a CAN communication module and an upper computer, wherein an ARM chip is in signal connection with the upper computer by the CAN communication module; the upper computer sends an instruction to allow the ARM chip to generate a PWM (Pulse-width Modulation) wave to control the rotating speed of the motor; stepless speed regulation of the motor can be achieved by changing a duty ratio of the PWM wave; an incremental photoelectric rotary encoder converts a rotating angle and the rotating speed of the motor into a pulse signal, and feeds back the pulse signal to a quadrature encoding pulse unit of the ARM chip; the ARM chip collects the fed back pulse signal and compares with given expected values of a position and the speed, to achieve double closed-loop control of the position and the rotating speed; and a locked rotor current of the motor is acquired by the motor driver module, converted into a voltage signal, and fed back to the motor driver module by a voltage comparator, so that overcurrent protection is achieved. The system has the advantages of simple structure, high operating speed, high communication efficiency, and the like.

Description

technical field [0001] The invention relates to the technical field of real-time monitoring and fault diagnosis of motor running state, designs an ARM-based control system, and studies the CAN bus communication and intelligent control technology of the controller. Background technique [0002] The three-phase DC brushless motor is a kind of electromechanical integration motor that has rapidly matured with the development of power electronic devices and new materials. Speed ​​characteristics without problems caused by mechanical commutators, and also have the advantages of stable operation, high efficiency, and relatively low cost, so they are widely used in various speed-adjustable drive occasions. In the past, brushless DC motors were mostly composed of single-chip microcomputers and various interface devices, which was not only complicated, but also limited in speed. It was difficult to realize control from position loop, speed loop, current loop, and voltage loop, and it...

AI Technical Summary

Problems solved by technology

In the past, brushless DC motors were mostly composed of single-chip microcomputers and various interface devices, which was not only complicated, but also limited in speed, making it difficult to realize control from position loop, speed loop, current loop, and voltage loop, and it was also inconvenient to expand

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