The torque of the reluctance switch motors is created from the sum of its discrete values, the purpose of which is to create a continuous torque on the motor shaft, causing a phenomenon called torque ripple in the commutation regions. In this paper, in order to reduce t More
The torque of the reluctance switch motors is created from the sum of its discrete values, the purpose of which is to create a continuous torque on the motor shaft, causing a phenomenon called torque ripple in the commutation regions. In this paper, in order to reduce the radial force and stabilize the torque, the design of a reluctance switch motor with a discrete rotor structure is simulated using Magnet software. For this purpose, first by examining the radial force acting on the rotor in different currents and situations from the area unaligned to aligned, a function called radial force function is introduced. Then, using the introduced function and the torque-current relationship, the phase reference torque is introduced so that the sum of the torque moments is equal to the reference torque of the motor. For experimental purposes, using Matlab software, the motor circuit and its drive are simulated, and by applying the torque function introduced as the reference torque, the results are compared with the results of the linear torque common function. And the simultaneous representation of the figure of the two radial forces obtained shows that the motor torque ripple is reduced and is almost the same as the torque in the linear common state. This is in a situation where the radial force decreases relative to the radial force of the linear joint torque.
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Abstract:Electrical and mechanical benefits, simple manufacturing and maintenance of switched reluctance motor make it suitable in industrial and home applications, but the most important drawbacks of switched reluctance motor are discontinuous torque and no self-starti More
Abstract:Electrical and mechanical benefits, simple manufacturing and maintenance of switched reluctance motor make it suitable in industrial and home applications, but the most important drawbacks of switched reluctance motor are discontinuous torque and no self-starting in some rotor positions. In this paper a novel rotor structure is presented and optimized in order to increase positive torque region and eliminate dead-zone in high loads. The torque produced in this proposed SRM is divided in two regions and overlapped in two phases periodically. In order to find the best output character and optimal design, two factors, position and angle of cut edge are optimized. To verify the proposed rotor, torque characteristic, flux path and torque ripple has been analyzed by finite element method and compared with conventional 4/2 switched reluctance motor. The proposed motor has a continuous torque characteristic.Index Terms: Switched reluctance motor; Continuous torque; Finite element method; Dead-zone region.
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In recent years, metropolises around the world have seen a declining trend in the air quality index. Much of this pollution is related to public transportation. Upgrading public transportation can be a way out of this impasse. Due to environmental concerns, it is recomm More
In recent years, metropolises around the world have seen a declining trend in the air quality index. Much of this pollution is related to public transportation. Upgrading public transportation can be a way out of this impasse. Due to environmental concerns, it is recommended to switch from conventional diesel buses to electric buses, which have several benefits in terms of reducing pollution, noise and fuel. In this paper, a high power induction switched reluctance motor used in a city electric bus is studied. The stator and rotor structure of this electric car is non-segmental. The structure is such that a short magnetic flux path is created in the rotor and stator core. As a result, high torque is produced with low losses. Since the electric motor has a very high power, it therefore requires a large amount of permanent magnets, so it is desirable that the electric motor in the electric bus does not have a permanent magnet. Here is a three-phase induction switched reluctance motor with a power of 220 kW, with 6 stator poles and 4 rotor poles. A two-dimensional finite element model is designed and its magnetic analysis is performed. The flux path, torque and efficiency of the induction switched reluctance motor are calculated and the results are presented.
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In the recent years, the use of switched reluctance motors (SRM) in industrial applications has been increased. In this regard, a large amount of research studies have been conducted on controlling the speed and torque of the aforementioned motors. These motors not only More
In the recent years, the use of switched reluctance motors (SRM) in industrial applications has been increased. In this regard, a large amount of research studies have been conducted on controlling the speed and torque of the aforementioned motors. These motors not only have a simple and stable structure, but also production cost is low. In addition, these motors take advantage of great power, the ability to work in high speeds and inadequate environments (hot and dusty), reliability, control-ability, and high efficiency. However, discrete torque production of SRM along with enormous magnetic saturation in their cores reduces the variety of their industrial applications and also causes the inappropriate torque ripples. In this paper, a modified logical-rule-based method is proposed which employs the technique of controlling torque sharing function. Moreover, the optimized turn-on angle for conducting each phase is achieved by estimating the inductance curve in the vicinity of unaligned position and based on an analytical solution. Simulation results on a four-phase switched reluctance motor and a comparison with the conventional methods indicates validity and effectiveness of the proposed modified method.
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