Simple power electronic drive circuit and fault tolerance of converter are specific advantages of SRM drives, but excessive torque ripple has limited its application. This paper presents a novel method of controlling the motor currents to minimize the torque ripple, using a neuro-fuzzy compensator. In the proposed control concept, a compensating signal is added to the output of a classical PI c...

Rossander, M. 2017. Electromechanics of Vertical Axis Wind Turbines. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1581. 81 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0117-4. Wind power is an established mean of clean energy production and the modern horizontal axis wind turbine has become a common sight. The need for maint...

This study proposes a novel frame anti-vibration controller for position sensorless PMSM drive application. This controller is called specific component reduction controller (SCRC). SCRC can function without an accelerometer and can achieve speed variable control. This study mainly comprises the following phases. First, the position sensorless control method will be provided. Second, the frame ...

The paper deals with modeling of synchronous reluctance motor (SynRM) accounting for all phenomena responsible for torque ripple. Based on winding function approach, the proposed model consists in computing self and mutual inductances considering no sinusoidal distribution of stator windings, slotting effect and no sinusoidal reluctance variation caused by the rotor saliency. Then, optimal curr...

The major problems in hysteresis-based DTC are high torque ripple and variable switching frequency. In order to minimize the torque ripple, high sampling time and fast digital realization should be applied. The high sampling and fast digital realization time can be achieved by utilizing high-speed processor where the operation of the discrete hysteresis regulator is becoming similar to the oper...

– The voltage fluctuations of the electrical power supply and their effects on both industrial and domestic apparatuses are today a central topic of discussion. The aim of this paper is the evaluation of the effects of the low-frequency voltage amplitude modulation on induction motors, with both numerical and experimental analysis. For the numerical analysis different kinds of modulations have ...

In this paper the principle, basic torque theory and design optimisation of a six-phase reluctance dc machine are considered. A trapezoidal phase current waveform for the machine drive is proposed and evaluated to minimise ripple torque. Low cost normal laminated salient-pole rotors with and without slits and chamfered poles are investigated. The six-phase machine is optimised in multi-dimensio...

In this paper, an improved immune algorithm (IIA) was proposed for the torque ripple reduction optimal design of interior permanent magnet synchronous motor (IPMSM) a fuel cell electric vehicle (FCEV) traction motor. When designing machines, both global and local solutions designs are required as result should be compared in various aspects, including torque, ripple, cogging torque. To lessen c...

Characteristics of toroidal rotation pro�les in tokamak plasmas are studied under the in�uence of fast-ion losses due to a toroidal �eld (TF) ripple by using a one-dimensional multi-�uid transport code, TASK/TX. When a neutral beam (NB) is injected into a plasma, a part of fast ions is lost due to the effect of the TF ripple. The radial current then �ows inward in the bulk plasma to keep quasi-...

To solve the problems of torque ripple and inconstant switch frequency of inverter in the conventional direct torque control (DTC), a novel DTC method using space vector modulation (SVM) is proposed based on input– output feedback linearization technique, where hysteresis controller is substituted by input–output feedback linearization and switch table is substituted by SVM. In order to preserv...