Design of Positioning Sensor-less Brushless DC Motor Controller for Molecular Pumps
Firstly,this article introduces the basic model and characteristics of brushless DC motors and studies the basic principles of positioning sensor-less control methods.Then,a position sensor-less brushless DC motor control system for molecular pumps is designed based on this method.The system uses the zero crossing detection method of back electromotive force to obtain rotor position information to perform commutation logic contro.The design improves the predetermined position and start mode of the motor,reduces the complexity of the structural design of the molecular pump motor,and improves the its reliability.Subsequently,the control system is introduced in detail from both the hardware design and software control strategies.Finally,verification is conducted on the experimental platform.The controller designed is used to drive the molecular pump.The results show that the molecular pump can start stably and enter the rated working state.The rated speed of the molecular pump can reach 90 000 r/min and the speed fluctuation remains stable within the range of±60 r/min.
positioning sensor-lessbrushless DC motormolecular pumpmotor controller
NETL
NSTL
万方数据
