Velocity Regulation in Switched Reluctance Motors under Magnetic Flux Saturation Conditions

We propose a controller for velocity regulation in switched reluctance motors under magnetic flux saturation conditions. Both hysteresis and proportional control are employed in the internal electric current loops. A classical PI velocity controller is employed in the external loop. Our control law is the simplest one proposed in the literature but provided with a formal stability proof. We prove that the state is bounded having an ultimate bound which can be rendered arbitrarily small by a suitable selection of controller gains. Furthermore, this result stands when starting from any initial condition within a radius which can be arbitrarily enlarged using suitable controller gains. We present a simulation study where even convergence to zero of velocity error is observed as well as a good performance when regulating velocity in the presence of unknown step changes in external torque disturbances.

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Design Considerations and Selection of Cost-Effective Switched Reluctance Drive for Radiator Cooling Fans

Electronics ◽

10.3390/electronics10080917 ◽

2021 ◽

Vol 10 (8) ◽

pp. 917

Author(s):

Ickjin Son ◽

Grace Firsta Lukman ◽

Mazahir Hussain Shah ◽

Kwang-Il Jeong ◽

Jin-Woo Ahn

Keyword(s):

Low Cost ◽

Cost Effective ◽

Magnetic Characteristics ◽

Switched Reluctance Motors ◽

Switched Reluctance ◽

Design Considerations ◽

Cooling Fan ◽

Cooling Fans ◽

Power Switches ◽

Selection Of

Switched reluctance motors (SRMs) are simple in structure, easy to manufacture, magnet-less, brushless, and highly robust compared to other AC motors which makes them a good option for applications that operate in harsh environment. However, the motor has non-linear magnetic characteristics, and it comes with various pole-phase combinations and circuit topologies that causes many difficulties in deciding on which type to choose. In this paper, the viability of SRM as a low-cost, rugged machine for vehicle radiator cooling fan is considered. First, necessary design considerations are presented, then three commonly use types of SRM are analyzed: A 3-phase 6/4, 3-phase 12/8, and a 4-phase 8/6 to find their static and dynamic characteristics so the most suitable type can be selected. Simulation results show that the 8/6 SRM produces the highest efficiency with less phase current which reduces the converter burden. However, with asymmetric half bridge converter, eight power switches are required for 8/6 SRM and thus put a burden on the overall drive cost. As a solution, the Miller converter with only six switches for four phase SRM. To verify the proposed idea, the 8/6 SRM was manufactured and tested. The results show that Miller converter can be used for the proposed SRM with slightly reduced efficiency at 80.4%.

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Simple analytical derivation of magnetic flux profile eliminating source current ripple and torque ripple of switched reluctance motors for electric vehicle propulsion

2017 IEEE Applied Power Electronics Conference and Exposition (APEC) ◽

10.1109/apec.2017.7931146 ◽

2017 ◽

Cited By ~ 4

Author(s):

Takayuki Kusumi ◽

Takuto Hara ◽

Kazuhiro Umetani ◽

Eiji Hiraki

Keyword(s):

Magnetic Flux ◽

Electric Vehicle ◽

Torque Ripple ◽

Switched Reluctance Motors ◽

Switched Reluctance ◽

Analytical Derivation ◽

Vehicle Propulsion ◽

Flux Profile ◽

Source Current ◽

Current Ripple

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Rapid multi-objective design optimisation of switched reluctance motors exploiting magnetic flux tubes

IET Science Measurement & Technology ◽

10.1049/iet-smt.2017.0213 ◽

2018 ◽

Vol 12 (2) ◽

pp. 223-229 ◽

Cited By ~ 6

Author(s):

Aleksas Stuikys ◽

Jan Sykulski

Keyword(s):

Magnetic Flux ◽

Switched Reluctance Motors ◽

Design Optimisation ◽

Switched Reluctance ◽

Flux Tubes ◽

Multi Objective ◽

Magnetic Flux Tubes

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Optimal Design of SRM for EV Application

Journal of Physics Conference Series ◽

10.1088/1742-6596/2070/1/012140 ◽

2021 ◽

Vol 2070 (1) ◽

pp. 012140

Author(s):

B. Srinivasulu ◽

G.V. Nagesh Kumar ◽

Vempalle Rafi ◽

P. Nageswara Rao

Keyword(s):

Optimal Design ◽

Electric Vehicles ◽

Motor Drive ◽

Switched Reluctance Motors ◽

Reliable Operation ◽

Design Constraints ◽

Switched Reluctance ◽

Independent Variables ◽

Different Shapes ◽

Selection Of

Abstract Electric vehicles (EVs) need a wide speed and torque range for their reliable operation and working. Switched reluctance motors (SRMs) offer several advantages like high life cycle, meager cost, simple construction, robustness, good speed characteristics, and fault-tolerance, making it a suitable motor drive for EV application. The selection of independent variables like dimensions, winding turns, make materials, the number of slots, and the shape of rotor and stator teeth is a cumbersome task as SRM performance is mainly dependent on these parameters. This paper describes the methodology for selecting these independent variables by evaluating the SRM performance for different shapes of rotor and stator teeth, with the different stator and rotor materials, by taking all the design constraints like winding resistance, turns, and the number of slots. The EV drive performance is evaluated for the chosen independent variables and analyzed using JMAG software for determining the efficiency, Torque, and speed responses for comparison and analysis to get the optimal design constraints of the independent variables of SRM.

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Performance analysis of segmented rotor switched reluctance motors with three types of winding connections for belt-driven starter generators of hybrid electric vehicles

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/compel-08-2017-0342 ◽

2018 ◽

Vol 37 (3) ◽

pp. 1258-1270 ◽

Cited By ~ 3

Author(s):

Xiaodong Sun ◽

Zhuicai Zhou ◽

Long Chen ◽

Zebin Yang ◽

Shouyi Han

Keyword(s):

Magnetic Flux ◽

Hybrid Electric Vehicle ◽

High Efficiency ◽

Torque Ripple ◽

Iron Loss ◽

Switched Reluctance Motors ◽

Content Type ◽

Switched Reluctance ◽

Output Torque ◽

Hybrid Electric

Purpose Inductance, torque and iron loss are the key parameters of switched reluctance motors for belt-driven starter generators. This paper aims to present the analysis of a segmented rotor switched reluctance motor (SSRM) with three types of winding connections for hybrid electric vehicle applications by using a two-dimensional finite element method. Design/methodology/approach The rotor of the studied SSRM consists of a series of discrete segments, while the stator is made up of exciting and auxiliary teeth. First, the concept and structures of the different winding connections are introduced. Then, the magnetic flux path of the three types of winding connections for the SSRM is described. Second, the magnetic flux distributions in the three parts, i.e. the stator yoke, the stator tooth and the rotor segment, are described in detail to calculate the iron losses. Third, three SSRMs with the different winding arrangements are analyzed and compared to evaluate the distinct features of the studied SSRM. The analysis and comparison mainly include self-inductances, mutual inductances, phase currents, output torque and iron loss. Findings It is found that the self-inductances of the three types of winding connections are almost equal, and only the SSRM1 has a positive mutual inductance. In addition, the current waveforms of SSRM1 and SSRM2 are regular. However, it is irregular in SSRM3. It is shown that SSRM1 has better characteristics, such as higher output torque, high power density, lower torque ripple and iron loss. Originality/value This paper proposes and analyzes three novel winding connections for the SSRM to provide guidance for enhancing the output torque and reducing the iron loss to achieve high efficiency.

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