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This paper proposes the current reconstruction method in the single current-shunt inverter (SCSI) during the six-step modulation. Since the voltage vectors of the six-step operation are placed in the immeasurable areas of SCSI, the phase current cannot be reconstructed in the conventional researches. However, by changing the position of the sampling period, the current signal can be reconstructed...
The paper presents an operating strategy for high-speed Switched Reluctance (SR) generators employed in exhaust gas energy recovery systems. The machine is operated in “single pulse” mode and a parametric study of the control angles is performed to analyse the machine operation. It is shown that for given speed and power optimum sets of control angles exist, which achieve maximum machine efficiency...
The experimental verification of the results of the mathematical analysis of a six-phase induction machine is presented in this paper. The verification is based on the measurement of the currents and torques at the feeding of stator winding by voltages which correspond only to a selected symmetrical component. The measured values are compared with the results of theoretical calculations. A single-phase...
A method for the determination and measurement of the real and reactive powers of multiphase electric machines is proposed using the geometrical algebra and the power invariant stationary reference frame transformations of the phase voltages and currents. Geometrical Algebra provides the expressions for the calculation of the powers. A four-wattmeter method to determine the active and reactive powers...
A new source for the DC current offset in the PWM inverter-fed loads is found. A significant irregularity in dead time voltage compensation due to a very small offset in phase current measurement is the cause for it. In the phase currents and voltages, high DC offsets appear at low current magnitudes, which lead to a first torque harmonic in the drive. Recommendations how to avoid or compensate this...
The present paper deals with the in-depth experimental analysis of PMSM considering the motor design solution for an electric assisted active steering system as a case study. The experimental motor and the complete laboratory set-up including the power electronic, motor control and measurement devices are presented. A comprehensive measurement procedure will be described and the measurements results...
Magnetic thin films of FexN were prepared by so-called "ion reacting deposition." To clarify the effect of ion beam irradiation during deposition, the difference between use of N2 ions and Ar ions was studied. A low-energy broad-beam ion source (Kaufman type) was directed normal to the substrate, which was set obliquely to the direction of iron vapor incidence. All of the FexN films consisted...
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