Brushless dc motor has a common dc motor has simple structure, reliable operation and maintenance is convenient wait for a series of advantages, also has ac motor running with high efficiency, no excitation loss and speed control performance is good, and many other advantages, is now widely should be used in industrial control fields. Brushless dc motor using high magnetic material and electronic commutation principle, overcoming the brush dc motor commutator of the poor reliability and maintainability, keep the good control performance of dc motor. The sensorless brushless dc motor system used in the automotive fuel pump drive, which improve the service life of oil pump, and enhance the stability of the oil pump operation, is one of the future development trend of automotive technology.
In this paper, the integrated brushless dc motor and its control system to carry on the design and research. In permanent magnet brushless dc motor control system in this paper, on the basis of development and application in detail the structure and working principle of brushless dc motor, this paper introduces the working principle of the motor rotor position of the back emf method. After comparing different design schemes, chose to conform to the requirements for the design of the system hardware, software and the mechanical structure design. Then expounds on the integration of the design of brushless dc motor system structure, including the design of the pump structure and the design of brushless dc motor ontology. Then the integration of brushless dc motor control system design of hardware and software is discussed in detail. With the Microchip company dsPIC30F4012 chip as the core, design of brushless dc motor and the inverter circuit, current voltage sampling circuit, drive and protection circuit, and introduces in detail the system hardware circuit board layout strategy.
Brushless dc motor
System software design, research and design of the motor starting strategy, also introduces the main loop program, speed rings at the current program, the ADC module subroutine DengZi program. Finally using MATLAB/SIMULINK to establish without position sensor brushless dc motor control system simulation model of speed and torque are given, simulation of back emf waveform. And the comparison was made on the experimental prototype in detail of the test results, analyzes the runtime waveform figure, has the very good consistency with the theory, verify the feasibility of control system design and the effectiveness of the proposed sensorless operation mode.
Shenzhen hai bo motor driven development co., LTD., long-term efforts to BLDC control system research and development work, motors r&d technical team with rich brushless drive drive scheme, the design and development of application experience.