Abstract
The present article proposes a three-phase resonant boost inverter (TPRBI) to feed a permanent magnet brushless DC (PMBLDC) motor at the requested torque with low ripples due to the sinusoidal current injected into the PMBLDC motor. PMBLDC motors have the highest torque-to-weight ratio compared to other motors and are the best choice for electric vehicle applications. Conventionally, these motors are driven by voltage source inverters (VSI) with trapezoidal current injection, introducing unwanted torque ripples. Moreover, due to the buck operation of VSI, an extra power conversion stage is required to elevate the battery voltage level to desired DC-link voltage. This extra stage increases the number of components used, complexity of control and decreases the efficiency and reliability of the overall system. TPRBI injects sinusoidal current in the PMBLDC motor in the proposed method, thus minimizing the torque ripples. The proposed inverter also has an inherent voltage boost characteristic, thus eliminating the extra power conversion stage. The single-stage conversion from DC to boosted sinusoidal AC enhances the system reliability and efficiency and minimizes the cost and weight of the system. A MATLAB/Simulink model is presented along with simulation results and mathematical validation. A comparative evaluation of the proposed system with the conventional VSI-fed PMBLDC motor is presented in terms of induced torque ripples.
Highlights
Electric vehicles have emerged to be the most viable solution to reduce greenhouse gas (GHG) emissions at source
Conventional voltage source inverters (VSI) injects a trapezoidal current into the permanent magnet brushless DC (PMBLDC)
This work proposes a three-phase boost inverter based on fundamental frequency switching capable of providing a high gain boost factor and sinusoidal current injection in the PMBLDC motor
Summary
Electric vehicles have emerged to be the most viable solution to reduce greenhouse gas (GHG) emissions at source. The Z-source inverter (ZSI) proposed in [14] emerged as a new family of inverters capable of buck–boost operation for single-phase and three-phase applications by providing varying DC-Link voltage at an interim stage. Multilevel inverters (MLIs) capable of providing boosted AC voltage output for low voltage DC input have gained popularity Various topologies such as flying capacitors and multi-H-Bridge cascading were investigated [19]. This work proposes a three-phase boost inverter based on fundamental frequency switching capable of providing a high gain boost factor and sinusoidal current injection in the PMBLDC motor. A new three-phase resonant impulse inverter (TPRBI) is proposed to drive a PMBLDC at high torque, but with low ripples due to the sinusoidal current injected into the PMBLDC motor; 2.
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