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This paper introduces a general method to evaluate the power losses of active (power semiconductors) and magnetic (inductors) components in power electronic systems. The bidirectional current conduction of silicon-carbide MOSFETs is analyzed to more accurately estimate the conduction and switching losses. Compared to conventional methods, the core loss of the magnetic components is estimated in a...
Brushless DC operation with a trapezoidal waveform of permanent magnet machines provides a simple, robust and cost effective method to drive the motor. In this paper, the proven technology is applied to a motor drive system with series-connected multiphase windings and converter cells. The proposed topology provides a modular approach and enables MOSFETs, which are more efficient and cost competitive,...
The accurate measurement of efficiency in wide band-gap semiconductor based converters, wherein efficiencies over 98% are achievable, is a challenge. In this work, a simple, open-loop, experimental dc-ac-dc back-to-back power conversion methodology is presented for the measurement of the combined losses of the power converter and passive filter. Additionally, only the power loss needs to be supplied...
Brushless DC operation with a trapezoidal waveform of permanent magnet machines provides a simple, robust and cost effective method to drive the motor. In this paper, the proven technology is applied to a motor drive system with series-connected multiphase windings and converter cells. The proposed topology provides a modular approach and enables MOSFET, which is more cost-effective and efficient,...
This paper introduces a new method to stabilize synchronous reluctance motors (SynRMs) driven by efficiency optimized V/f control utilizing optimized flux. Efficiency optimized V/f driven SynRMs are prone to instabilities. Specifically, it becomes unstable for either fast ramp acceleration or large load disturbances. For example, in an efficiency optimized V/f control scheme, flux is reduced under...
Multiphase variable speed drive systems have gained more and more interest recently because of their lower torque ripple as a result of the harmonic cancellation effects between phases. This paper presents a nine phase variable speed drive system with reduced frequency PWM control scheme. The proposed PWM scheme is tailored for multiphase winding to reduce torque ripple and associated rotor losses...
Multiphase variable speed drive systems have gained more and more interest recently because of their lower torque ripple as a result of the harmonic cancellation effects between phases. This paper presents a nine phase variable speed drive system with reduced frequency PWM control scheme. The proposed PWM scheme is tailored for multiphase winding to reduce torque ripple and associated rotor losses...
This paper proposes a new control scheme of five-level active NPC (5L-ANPC) converters for common mode voltage (CMV) mitigation in medium voltage (MV) drives. By properly synchronizing and selecting the voltage vectors of active frond-end rectifier and motor-side inverter, the peak level of CMV at motor terminals can be effectively reduced, which is required for explosion proof (EX) applications....
In this paper, the operation characteristics of five-level active-neutral-point-clamped (5L-ANPC) inverters under device short failure conditions are analyzed. A new fault tolerant control scheme is proposed, which enables continuous operation and generating three-phase sinusoidal currents of 5L-ANPC inverters. The remaining redundant voltage vectors can still be utilized to improve operating performance...
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