The concept of intelligent home products was put forward in the 1980s of the last century. In recent years, due to the progress of science and technology, intelligent home industry has been rapidly developed, and intelligent home has become the first choice of investors and entrepreneurs. Now, people can really feel the improvement of the quality of life brought by smart home products. Sweeping robot is one of the important products in intelligent home appliances.
The working motors of the sweeping robot are divided into walking, vacuuming and brush motors. There is a driven steering wheel in front of the sweeper walking structure, and a driving wheel on both sides, which is controlled by brushless DC motor. The cleaning structure mainly uses a vacuum cleaner and a rotating brush driven by a motor.
Brushless DC machines with high efficiency, large power, small size, high control precision obvious characteristics in the field of robotics has been widely used. Brushless DC motor has good speed regulation performance, by using electronic commutation, pulse width modulation pulse speed regulation, in the further improvement of the performance of DC motor, to overcome a series of problems caused by the traditional mechanical commutation of DC motor, thus greatly prolonging the service life of the motor.
The DC brushless motor control circuit mainly includes control circuit microprocessor, data signal processor and special purpose integrated motor. The method of using single chip microcomputer supplemented with peripheral processing circuit, its frequency measurement, commutation, control and adjustment are realized by software. The brushless DC motor is controlled by single chip and software programming. The fan in the vacuum cleaner and the motor driving the brush use DC motor, because there is no need to speed, reversing. Therefore, the control method is relatively simple.
Motor movement system structure determines the movement space of the robot, the wheel structure, which is the main wheel, the left and right wheels, the need for speed control of the motor, the front steering wheel for the driven wheel, easy to steer the robot.
Dc motor has good linear speed control characteristics, simple control performance, high efficiency, good dynamic characteristics, so it has been occupying the traditional position of speed control. Although recently has been constantly challenged by other motors, such as AC frequency conversion motor, stepper motor, but DC motor is still the optimal choice of many speed control motor, in production and life is still widely used.
