Brushless DC (Direct current) motor driver

Abstract

The invention discloses a brushless DC (Direct current) motor driver. The brushless DC motor driver structurally comprises a power supply changeover control module, a main control chip control module, a switch module and a power amplification output module, wherein the motor driver has three control modes below: rotating speed data are directly sent to a single-chip through 485 communication; rotating speed analogue input, that is to say, the input analogue signal is changed into a digital signal through A / D conversion, and then processed and changed into rotating speed data through the single-chip; rotating speed PWM ((Pulse Width Modulation) input, that is to say, an input PWM signal is sampled, and then changed into the rotating speed data based on a PWM duty ratio. The driver is simple in control method, high in speed adjusting precision and diversified in control mode, can export a negative current, can completely control the motor, can efficiently reduce system complexity, can reduce system cost and resource waste, and enables installation, debugging and after-sale to be simple.

Description

technical field [0001] The invention relates to a DC brushless motor driver. Background technique [0002] Brushless DC motors not only have the advantages of simple structure, reliable operation, and convenient maintenance of AC motors, but also have the characteristics of high operating efficiency, no excitation loss, and good speed regulation performance of DC motors. Therefore, they are widely used in various fields of today's national economy. growing in popularity. At present, the driving circuit of the DC brushless motor is relatively complicated, and the control method is single. When the reverse current cannot be discharged, the motor driving circuit will be burned. In the field of motor driving control, many open-loop speed regulation systems are still used, that is, the control part directly controls the rotation of the motor. There is no need to detect the actual speed of the motor, so there will be a phenomenon of loss of control when driving the motor. In Chin...

AI Technical Summary

Problems solved by technology

At present, the driving circuit of the DC brushless motor is relatively complicated, and the control method is single. When the reverse current cannot be discharged, the motor driving circuit will be burned. In the field of motor driving control, many open-loop speed regulation systems are still used, that is, the control part directly controls the rotation of the motor. There is no need to detect the actual speed of the motor, so there will be a phenomenon of loss of control when driving the motor. In China, the current drive circuit is developed based on a dedicated drive chip for the motor, which greatly limits the development of the motor driver.

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