Dsp Based Impelementation Of Field-weakening On Synchronous Motor For High Speed Operation

Permanent magnet motors have high efficiency and torque density compared to induction andrnconventional synchronous motors in general. However, in applications requiring wide speedrnrange, the air-gap field, which is produced by the permanent magnets, can’t be controlledrndirectly to control the back-emf of the motor for field weakening operation. In conventionalrnsynchronous machines the excitation current can be controlled to control the field and hence thernspeed.rnThis thesis presents development of field weakening control for Permanent Magnet SynchronousrnMotor (PMSM) using demagnetizing component of stator current. The control is implementedrnusing Texas Instruments’ TMS320LF2401A Digital Signal Processor (DSP). The control methodrnpresented relies on the field orientated control (FOC) together with a field-weakening operation.rnThe field-weakening operation is required to extend the speed in the constant power range ofrnoperation, where there is no more voltage adjustment possible to increase the speed.rnThe field oriented control of the motors has been modeled, simulated using MATLAB and Somernof the modules of field oriented control are tested practically and results are given in this thesis.rnThe results demonstrate that the speed of the PMSM can be extended in the constant power rangernfor applications requiring wide speed range like in electric vehicle.

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