Dsp-based Brushless Dc Motor Control System Research And Design

This paper mainly study some pivotal techniques—position detection, start andcontrol method, which surrounds brushless DC motor (BLDCM) without position sensor control system's design. On base of analyzing and studying the run mode of BLDCM, we present a new rotor position detection method which was instantaneous state detection combined with state predict, and use "three sect" start method. In order to improve the speeding performance, we adopt the two closed-loop control strategy of speed and current. The MCU of system is the TMS320LF2402 DSP chip. In virtue of powerful processing capacity and plenty peripherals of DSP, the system adopt more reasonable software structure instead of the former complicated hardware circuit, and get better dependability.Experimental results show that the motor start fast and stable with wider area of speeding. This BLCDM control system has the characteristic of simple structure, high dependability, and can be used in many fields.