Dsp Based Field Weakening Control Of Pmsm

This thesis deals with control of PMSM (Permanent Magnet Synchronous Motor) withrnfield weakening capability using DSP board and simulation using Matlab/Simulink. Thernpractical part will only cover up to open loop control due to the failure of some I/O pinsrnfor PWM output. A PMSM motor model has been analyzed in order to control the motorrnboth in the constant-torque (constant flux) and in the constant-volt-ampere (fluxrnweakening) regions.rnA flux-weakening technique is applied when extension of the motor speed beyond basernspeed is desired. The field-oriented control, with its flux/torque decoupling feature isrnrealized with a digital PWM controller in rotating d-q coordinate system. This kind ofrncontrol requires a relatively powerful microprocessor along with the relevant peripheralsrnto make vector control a practical proposition. The DSP board used, TDS2407 EA isrndesigned for such drive application.rnSimulation results demonstrate that the speed range of the surface mounted PMSM userncan be extended up to approximately 350 rpm by field weakening while the speed isrnlimited to 175 rpm without field weakening.rnKey words:rnPMSM, vector control, field weakening, SVPWM, DSP

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