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An open end drive configuration utilizing a transformer isolated single phase high frequency ac link is presented. A high frequency ac link enables the use of a compact and light weight transformer to provide voltage transformation and galvanic isolation while the open end configuration leads to an improved utilization of the ac link. The desired output is synthesized using dual cycloconverters modulated...
Practical implementations of the power electronics required to operate bearingless machines with so-called “dual purpose no voltage” (DPNV) windings are proposed. These windings enable a bearingless machine to use the same coils to produce both radial suspension forces and torque, which has been shown in the literature to enable better machine performance. In this paper, the use of two-level inverters...
Practical implementations of the power electronics required to operate bearingless machines with the so-called “dual-purpose no-voltage” (DPNV) windings are proposed. These windings enable a bearingless machine to use the same coils to produce both radial suspension forces and torque, which has been shown in the literature to enable better machine performance. In this paper, the use of two-level inverters...
This paper presents a commutation technique to overcome the effects of transformer leakage inductance in a single stage high frequency ac-link transformer isolated inverter. The presence of leakage inductance causes large voltage spikes across the transformer due to the switched nature of link current that is encountered in direct high frequency ac link to low frequency ac conversion. This paper proposes...
A high frequency ac link, transformer isolated three phase inverter capable of bidirectional power flow is presented in this paper. Such an inverter finds widespread use in applications like interfacing alternate energy sources to the grid, UPS systems. A resonant LC circuit is used to achieve natural commutation of leakage energy in the leakage inductance of the transformer. This natural commutation...
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