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The two major drawbacks of the switched reluctance motor (SRM) are high torque ripple and acoustic noises. In this paper a new torque ripple minimization method is proposed for an SRM which is based on online current profiling by using the processed speed signal. Torque ripple of a SRM is usually reflected in the speed signal because of the electromechanical dynamics of the drives. By using proper...
In general, switched reluctance motors (SRMs) are driven by the unipolar current excitation. The conventional drive technique requires simultaneous optimization process for some controlled-parameters: the turn-on angle, turn-off angle, and current chopping level. The difficulty in the current command generation makes the torque controller design complicated. In the previous paper, to give a general...
A Switched Reluctance Motor (SRM) is one of the candidates of rare-earth-free-motors for hybrid electric vehicle (HEV). An SRM has been developed with exact IPMSM dimensions with competitive maximum torque, operating area, and maximum efficiency. However, considered windage loss of around 1.3 kW is resulted by the salient poles of the SRM at the maximum rotational speed. In addition, considerable...
The paper discusses the advanced spectral analysis performed on two important classes of electric drive systems, namely Switched Reluctance Motors (SRM) and Permanent Magnet Synchronous Machines (PMSM). In particular, the noise and vibration signatures as a function of operating speed are analyzed by using a waterfall analysis and an order analysis. The harmonic and modulation components attributable...
The switched reluctance motor is a good candidate for electrical traction and more specifically in automotive applications. The conventional switched reluctance motor presents two major drawbacks which are torque ripple and stator vibrations. In this work, a solution to limit these problems is proposed: a switched reluctance motor with magnetic slot wedges is used to reduce the impact of vibrations...
The purpose of this paper is the design of different switched reluctance drives for an existing drive train of an electromechanical actuation system of a small unmanned aerial vehicle. Therefore, the outside dimensions of the switched reluctance machine are determined by the used permanent magnet synchronous motor size to allow the easy exchange of the motor drives. Moreover, the switched reluctance...
The bearingless flux switching slice drive is a recently introduced motor topology in the field of bearingless drives. It combines the magnetic rotor suspension of bearingless slice drives with the torque generation of flux-switching motors. Due to lack of magnets embedded in the rotor, the topology offers advantages in applications with high temperature working conditions. This paper describes the...
Estimation of dimension parameters for an electrical machine has great importance before manufacturing. For this reason, analytical design should be performed in an optimum form. While motor analysis is accomplished by package programs, initial size parameters are intutivily provided and then various trials are examined to get optimum results. In this study, we are trying to find dimensional and electrical...
A switched reluctance motor has several features, including simple construction, high reliability, possible operation in high temperature, inherent fault tolerance, and low manufacturing cost make it more attractive for electric vehicle application. However, large torque ripple, acoustic noise and vibration are its major drawbacks. This paper present a five-phase SRM drive which features higher torque...
In this paper, a gain scheduling control design for the Switched Reluctance Motor phases current is presented. In the presence of the strong nonlinear characteristics of the motor phase inductance (dependence on the current and mechanical position) and parameters variation, the use of a fixed gain current controllers make difficult to ensure high performance with good stability robustness over the...
This paper presents a Switched Reluctance Motor (SRM) design procedure for an electric car drive system. Determination of geometrical dimensions, calculation of static parameters as well as the losses and efficiency is discussed. A dynamic SRM model is outlined and used to calculate the output characteristics of torque and power as functions of the speed. It is shown that the designed SRM satisfies...
We present a simple state observer for switched reluctance motors using stator currents. The estimation error dynamics is showed to be input-to-state stable with respect to (current, velocity and angular position) tracking errors as well as relative to load-torque compensation mismatch. The state estimator is designed in the context of the certainty-equivalence principle and proportional-integral-derivative...
Temperature effects on the performance of an Induction Motor (IM) and a Switched Reluctance Motor (SRM) is compared. Two Dimensional (2D) Finite Element Analysis (FEA) is used to calculate loss components in both motors at the same operating condition. A 3D FEA is then employed to calculate temperature rise in each motor. This has been used to update the material properties. Based on an iterative...
This paper presents a multi-stage Switched Reluctance (SR) motor. In this proposed machine, the numbers of stator and rotor poles are equal in each stage. Because of the structure the proposed SR motor can achieve high torque/current ratio in operation. Also, the low-vibration operation is possible by shifting the excitation firing angle. Effectiveness of the proposed SR motor is verified by performing...
This paper presents a novel single phase switched reluctance motor (SRM) which can be directly driven by commercial AC power supply without any switching circuit and sensor. This proposed SRM is optimized based on a simple design technique. The optimized machine has aimed to be higher motor efficiency than conventional induction motors (IMs). In addition, the novel SRM can achieve the start-up with...
In electric machine, there are several types that are practical for EVs. However, most of commercial EV including these types of motors used single motor and transmission gears coupled to the wheels. This system leads to the transmission losses and reduce the efficiency and reliability of the motor. Therefore, in-wheel direct drive mechanism is introduced to overcome this problem. In-wheel direct...
In this paper, a novel 12/8 segmental rotor type switched reluctance motor (SRM) is proposed. Different from conventional structures, the rotor of proposed structure is constructed from a series of discrete segments, and the stator is constructed from two types of stator poles: exciting and auxiliary poles. Moreover, in this structure short flux paths are taken and no flux reversion exists in the...
In this paper, a novel 12/14 bearingless switched reluctance motor (BLSRM) is investigated. For the conventional 12/14 BLSRM, there is only a small conduction range for positive torque generation. In order to solve this problem, shifting stator pole technology is applied in the proposed structure. It is good for increasing the output torque and simplifying the control circuit. However, the proposed...
This paper deals three types of switched reluctance motors (SRMs) for fan drive. The three types considered are 6/4, 12/8 and 8/6 types. In this paper, not only the design of these three types of SRM, but also their performances are compared for the application of automotive cooling fan. The design parameters are calculated and selected by some constraint equations to match the requirements of the...
Prediction of acoustic noise distribution generated by electric machines has become an integral part of design and control in noise sensitive applications. This paper presents a fast and precise acoustic noise imaging technique for switched reluctance machines (SRMs). This method is based on distribution of radial vibration in the stator frame of the SRM. Radial vibration of the stator frame, at a...
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