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Highly dynamic DC-machines, used in low power applications, often contain ironless or so called bell shaped windings. Because there is no massive iron core to support the windings, one of the limiting factors for the torque of the machine is the force on the single wires of the copper weave. Therefore, the knowledge of the force distribution on the single wires could be a helpful design criterion...
Paper introduces a coaxial magnetic gearbox with a new high-speed rotor configuration. The proposed configuration optimizes magnet volume and employs cage rotor bars in the high-speed rotor. The resulting proposed gear improves torque performance at overload condition, and utilises 5% less magnet volume in the high-speed rotor.
Nowadays electric tools have been widely used in many fields, such as woodworking, home decoration and mechanical maintenance. Permanent magnet (PM) machine have many merits such as high efficiency, high torque density, and high structural reliability. Due to these advantages, PM machine is suitable for electric tools. Firstly, this paper compares two rotor topology including tangential interior PM...
Rigid bar and pantographs are used to power electric railway vehicles. When operating an electric railway vehicle, Rigid bar and pantographs are unstable in contact and occurs Arc. It is the cause of breakdown and accident. In this paper, a contact loss simulator for a rigid bar system was designed and the characteristic of arc is analyzed. Especially, occurrence of arc due to the excitation frequency...
When designing a very-high-speed (VHS) machine, it is crucial to evaluate the windage losses accurately, because they are an important part of the total losses. It is therefore important to validate a reliable model, further used for the design and optimization of the motor. In this paper, an empirical windage loss model has been compared to measurements on a motor running up to 155 krpm in a pressure...
Electrical and mechanical faults in a three phase Induction machine is modelled and analysed, to identify potential fault signatures. Electrical, magnetic and torque signatures are analysed for various faults and their combinations, for potential fault signature identification. A multi-physics Finite Element tool is chosen for this analysis considering the possibilities to extend the study to thermal...
A new method for rotor fault detection of induction motor is proposed based on the combination of Duffing and PSO(Particle Swarm Optimization) algorithm. The fault characteristic frequency can be extracted accurately by using the sensitivity of the Duffing system to the initial parameters. Based on that, this paper presents an PSO algorithm to calculate the amplitude and initial phase of each frequency...
Following publication considers synchronous reluctance machine with increased number of phases. The main goal of this research is to investigate the alternative solutions to the existing and well-known 3-phase electrical machines. In particular, a 5-phase reluctance machine with concentrated stator winding is briefly mentioned and a 42-phase electrical motor equipped with stator solid bars is shown...
This paper investigates the influence of stator slot/pole number combinations on the rotor bar current waveform and electromagnetic performance of a squirrel-cage induction machines (IMs) designed with a slot number per pole per phase of two. 36-slot/6-pole (36S6P), 48S8P, and 60S10P IMs, all having 52 rotor slots, have been designed by using the same winding layout, stator outer diameter, stack length,...
The effect of number of rotor slots on the stator and rotor current waveforms, slot and tooth flux densities and performance characteristics, such as torque, torque ripple, losses, electromagnetic force, power factor, and efficiency are numerically studied in case of a 3-phase, 8-pole squirrel-cage induction machine (IM). The IMs have been designed by using the same winding layout, stator outer diameter,...
Recently, electric vehicle is paying attention because of its eco-friendly characteristics. Interior permanent magnet synchronous motor(IPMSM) is the most popular type of electric motor because of its compactness and high efficiency. But recently, rising costs of permanent magnet and demagnetization issues which result from high current density make interests in induction motor for vehicle traction...
A method for the time-step analysis of single-phase induction motors is proposed. The unknown variables in the differential equations are the currents flowing through the rotor bars. They are coupled with the distributed magnetic flux densities in the air gap instead of the inductance matrix while applying Kirchhofes and Faraday's induction laws. Two patterns for magnetic flux densities are necessary...
The canned solid-rotor induction motors with squirrel-cage (CSRIMSC) are widely used in petroleum, chemical and pharmaceutical fields. The equivalent circuit of the conventional induction motor is not suitable for CSRIMSC due to the special structure. In this paper, an analytical method of performance calculation for CSRIMSC is proposed. The effects of solid rotor and cans are considered. Besides,...
The brushless doubly fed machine (BDFM) is an alternative to the doubly fed induction generator, widely used in wind turbines, without use of brush gears and slip rings. Rotor design is important for designing an optimal multi-MW BDFM. To date, nested-loop rotors have been extensively used in various BDFMs but they may not be suitable for larger machines. In this paper, different methods of BDFM rotor...
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