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The paper reports unexpected failures of ultrahigh speed induction machine (USIM) supplied by PWM converter applied in a system developed for utilizing renewable and waste energies. Due to the high supply frequency of USIM the frequency ratio in the PWM converter was unusually low. The imperfect operation of the microcontroller commanding the PWM pattern generated subharmonics. It developed considerable...
This paper introduces a new diagnosis technique for the detection of incipient electrical rotor faults in doubly fed induction Machine (DFIM) for wind power systems. In the considered application, the rotor is supplied by a static converter for the control of active and reactive power flows from the generator to the electrical grid. A new diagnostic method based on the rotor modulating signals pre-processing...
In order to compare the torque performance of the three-phase induction machine with the six-phase induction machine, an experimental setup to test the torque performance has been done; Under the same condition and by using different control principle the three-phase and six-phase machines constructed for the same frame of the stator and rotor are tested. The three-phase is driven by Danfoss drive...
The drive system of a variable speed pump-storage power station consisting of a doubly-fed induction machine with a 3-level voltage source inverter feeding the rotor is presented. The advantages of variable speed pump-storage power stations are outlined. After a short comparison with the classical cyclo-converter solution the voltage source inverter solution is described in detail covering various...
In this paper, a new direct torque control (DTC) strategy of the doubly fed induction machine (DFIM) is presented. It is especially designed to operate at a considerably low constant switching frequency, reducing the electromagnetic torque and rotor flux ripples, in order to provide good steady-state and fast dynamic performances, for high power drive and generator applications, with restricted switching...
The paper deals with a six phase induction motor (6PIM) design for 42 V embedded application, in particular, for an electrical power steering (EPS). This motor with symmetrical 60 degrees displacement windings allows to have more reliability in automotive applications, such as steering by wire. In fact with a failure of one or more phases of one of the two three phase windings the motor is able to...
In addition to the mechanical excitations, such as unbalance, also electromagnetic forces due to eccentricity cause vibrations in asynchronous machines. For slip-ring induction machines without parallel windings in the rotor and stator the magnetic spring, which describes the magnetic pull due to these eccentricity fields, is independent of the kind of eccentricity - static and dynamic eccentricity...
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