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Variable voltage and frequency supply to a.c drives is invariably obtained from a three-phase voltage source inverter. A number of Pulse width modulation (PWM) schemes are used to obtain variable voltage and frequency supply. The most widely used PWM schemes for three-phase voltage source inverters are carrier-based sinusoidal PWM and space vector PWM (SVPWM). There is an increasing trend of using...
This paper describes a 15 kW test bench dedicated for traction drives investigations. A first comparison between simulations and measurements proves the usefulness of such a mockup, which constitutes a good alternative for finding future novel strategies of power electronics control, traction transformer modeling in term of windingspsila coupling effects, as well as the improvement of the system efficiency.
In order to measure accurately rotor flux, easily and simply estimate rotor speed for induction motor, this paper proposed a rotor flux observer based on a novel voltage model, and an original sensorless control method based on the phase difference between the stator current vector and the stator voltage vector. A novel voltage model was constructed, and then the rotor flux observer was established...
Line start permanent magnet motors (LSPMMs), which consist of a squirrel-cage rotor that contains a few permanent magnets, can be considered as being more efficient than high-efficiency induction motors. However, methods to improve the starting and running characteristics of LSPMMs have not been clarified in detail. In this paper, we propose the basic concepts of an analytical calculation method of...
Linear Induction Motors (LIMs) have asymmetrical parameters. It causes LIMs thrust pulsation. Some methods have been proposed to avoid the thrust pulsation such as DTC (Direct Thrust Control) with PI control. These methods need parameter information. This paper proposes a method to identify the asymmetrical parameters by DC Decay Testing Method on alpha-beta axis. This method identifies the parameters...
The starting performance of 5-60 MW solid-pole salient synchronous motors having 4 or 6 poles is discussed. The rated performance derived by voltage-scaling from reduced-voltage factory tests, is compared against onsite measurements and rated-voltage factory tests. Issues addressed by the paper are the need for: accurate but practical measurement methods, individual focus upon the average and the...
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