Excitation Control of Brushless Induction Excited Synchronous Motor with Induction Machine Operating in Deep-Plugging Mode
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1
Indian Institute of Technology Kharagpur, Kharagpur, India
2
Indian Institute of Technology Delhi, Delhi, India
Power Electronics and Drives 2024;9 (44):257-271
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ABSTRACT
The popularity of electrified transportation is rising at a sharp pace due to environmental concerns over internal combustion (IC)
engines. Researchers are nowadays looking for a brushless and permanent magnet (PM)-less solution for electric vehicle (EV) motors.
Wound-field synchronous motor (WFSM) is a potential solution for EVs and is being used in Renault Zoe EV and BMW iX3 e-Drive
models. A Brushless Induction excited Synchronous Motor (BINSYM) is a WFSM where the exciter, an induction machine (IM), is
embedded inside the synchronous machine (SM) frame. Two machines (SM and IM) are configured for different numbers of poles to
achieve magnetic decoupling, which facilitates independent control of both machines. The purpose of IM is to maintain the excitation
requirement of SM. The IM is controlled in deep-plugging mode at a constant slip frequency over the entire speed range to minimise
its reactive power demand. The maximum torque per ampere (MTPA) and root mean square (rms) current minimisation algorithms
are used to control the SM. Simulation of the BINSYM-based system under dynamic conditions (MTPA with varying field current and
load transient) has been carried out in MATLAB/Simulink to validate the control strategies. Experimental findings from the laboratory
prototype machine closely match the simulation results.