Control method of brushless direct current motor control system

Abstract

The invention discloses a control method of a brushless direct current motor control system. The brushless direct current motor control system comprises a Cortex-M0 processor, a PWM control module, aback electromotive force detection module, a motor, a system voltage and current detection module, an LCD display module and a key module. The Cortex-M0 processor is electrically connected with the PWM control module, the back electromotive force detection module, the system voltage and current detection module, the LCD display module and the key module respectively; and the PWM control module andthe back electromotive force detection module are electrically connected with the motor. The control method comprises the following steps: initializing bottom layer drive ; executing a main program execution process; executing a DMA interrupt service process; executing a first timer interrupt service process; and executing a second timer to interrupt the service flow. The cost is lower, and the market competitiveness of the product is favorably improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a control method for a brushless DC motor control system. Background technique [0002] In the related art, the permanent magnet synchronous motor whose excitation magnetic potential distribution is square wave is called a brushless DC motor (BLDC). This type of motor is often used in DC frequency conversion range hoods. The control method of the brushless DC motor is generally as follows Two ways: [0003] 1. Use the Hall sensor to sense the position of the motor rotor to calculate the switching time of the control signal, but it uses the sensor for auxiliary detection, which will increase the cost of the product; [0004] 2. The motor rotor position is obtained by detecting the back electromotive force state of the motor phase voltage, so as to calculate the switching time of the control signal. It does not need to use sensors for auxiliary detection, and the cost is low, but i...

AI Technical Summary

Problems solved by technology

[0003] 1. Use the Hall sensor to sense the position of the motor rotor to calculate the switching time of the control signal, but it uses the sensor for auxiliary detection, which will increase the cost of the product;

[0004] 2. The motor rotor position is obtained by detecting the back electromotive force state of the motor phase voltage, so as to calculate the switching time of the control signal. It does not need to use sensors for auxiliary detection, and the cost is low, but it has a high processing capacity for the MCU processor. Require

In addition, in order to obtain high control stability, the digital signal processor (DSP) is often used in the control core of the brushless DC motor. This will lead to a higher cost of the chip. On the other hand, the more complex software and hardware design and low compatibility make the debugging of the system difficult and the technical threshold is higher.

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