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       the concept of smart home products was put forward in the 1980s. in recent years, due to the progress of technology, the smart home industry has developed rapidly, and smart home has also become the preferred industry for investors and entrepreneurs. now, people can really feel the improvement of life quality brought by smart home products. sweeping robot is one of the important products in smart home appliances.

       the working motors of the sweeping robot are divided into walking, dust suction and brush motors. in the walking structure of the broom, there is a driven steering wheel in the front, and a drive wheel on both sides, which is controlled by a brushless dc motor. the cleaning structure mainly uses vacuum cleaner and rotary brush driven by motor.

       brushless dc motor has obvious characteristics of high efficiency, large power, small size, high control accuracy, and is widely used in the field of robots. brushless dc motor has good speed regulation performance. since it adopts electronic commutation and pulse width modulation pulse speed regulation, it can further improve the performance of dc motor and overcome a series of problems caused by traditional mechanical commutation of dc motor, thus greatly extending the service life of the motor.

       dc brushless motor control circuit mainly includes control circuit microprocessor, data signal processor and special integrated motor. the frequency measurement, commutation, control and adjustment are all realized by software by using the method of using the single chip computer and peripheral processing circuit. the dc brushless motor is controlled by single chip and software programming. the fan in the vacuum cleaner and the motor driving the brush all use dc motor. because there is no need for speed regulation, reversing is required. therefore, the control method is relatively simple. the motion system structure of the motor determines the motion space of the robot. the wheel structure is adopted. the left and right wheels are the driving wheels, which require adjustable speed motor control. the front steering wheel is the driven wheel, which is convenient for the robot to turn. dc motor has good linear speed regulation characteristics, simple control performance, high efficiency and good dynamic characteristics, so it has always occupied the traditional position of speed regulation control. although it has been continuously challenged by other motors, such as ac variable frequency motor and stepping motor, dc motor is still the best choice for many speed control motors and is still widely used in production and life.

       selection of dc brushless motor for sweeping robot: the mobile structure of the sweeping robot uses the differential steering type. in order to realize the differential operation, the broom dc brushless motor with dispatch function is needed. to know the output power required by the broom dc brushless motor, the bldc3012 broom dc brushless motor can be used. we know that the broom operation requires the output power of the motor, and the output power of the selected motor is greater than the power we need, which meets the needs, the speed of the brushless dc motor of the broom is adjustable between 5000~8000 rpm, which also meets the torque requirements of the broom. to sum up, the bldc3012 motor is appropriate.