A Design For BLDC Controller

As is known to all, Electrical Bicycle plays a very important role in reducing airpollution, and it is, for the most part, helpful to relieve traffic congestion. E-Bikeindustry has a considerable development prospects in China, as almost every familyhas one. The motor system of E-Bike was Brush Direct Current motor in the earlyperiod. But now as the development of produce and control technology of BrushlessDirect Current motor, the BLDC has replaced the BDC. The stability and amenitydepend on BLDC control.Firstly, this text explains the theoretic base of BLDC and analyses the keyparameters of BLDC mathematical model and transfer function which introducedfocal point. Secondly, it designs the hardware of BLDC controller, which includesmain control chip, measurement of current circuit, signal checking circuit of HALLposition sensor, handlebar voltage checking circuit. Among them, it has made adetailed analysis of the internal configuration of the master chip PSoC CY8C24533and the modules and depiction the bootstrop MOSEFT dirve circuit this text used.Thirdly, it introduces again the design of software, including the design of mainprogram and task scheduling algorithm, current limiting control, over currentprotection, under voltage protection, electric braking procedures. Also, it focuses onthe relations between the tasks of scheduling, the method and control of currentcollection. It is proved that the RTOS based on RMS is stably and reliably,it candistribute the resource of E-Bike system rationality.Finally, there are many tests on thecontroller designed in this paper including dynamic and static test, which concludes alot of testing data,include of them the important analysis is the E-ABS.Through thecomparative analysis of the measured data and simulation data, it optimizes controlalgorithm.Though the above it draws the conclusion that the BLDC controller designed hasa faster starting speed, stable limiting current, efficient motor and reliable machinerymovement.