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Modeling and Control of Fully Pitched Mutually Coupled Switched Reluctance MachinesUddin, Md Wasi 04 October 2016 (has links)
No description available.
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High-Speed Conventional and Mutually Coupled Toroidal-Winding Switched Reluctance Machines: Design and ComparisonLin, Jianing January 2019 (has links)
Switched reluctance machines (SRMs) are well known for their simple and robust structure, facilitating their increasing application in many sectors, for example vacuum cleaners, where domestic machines operate at high-speed, 50,000 RPM being typical. Conventional SRMs (CSRMs) use a decoupled concentrated phase winding so that torque is predominantly only generated due to the self-inductance, which limits utilization of the machine electrical circuits.
In this thesis, the toroidal winding SRM (TSRM) is introduced, which operates based on the variation of mutual inductance between different phases. The toroidal winding introduces additional winding space, and the winding is practically easy to implement, both features that lead to a relatively higher copper filling factor. The toroidal winding also benefits the machine thermal performance, as the winding is directly exposed on the machine periphery and thus accessible to cooling. All these make TSRMs interesting and meaningful for further study.
Following a comprehensive comparison of CSRM and TSRM characteristics, a general torque equation is presented that is applicable to both CSRM and TSRM. Two 12-switch converters are proposed to drive three-phase TSRMs. Moreover, sinusoidal current excitation with a commercial three-phase half-bridge converter has been suggested as an alternative converter solution for TSRMs.
Accordingly, a three-phase six-stator-pole, four-rotor-pole CSRM is designed and optimized with a speed of up to 50,000 rpm in this thesis. A TSRM is resized to achieve the same envelope dimension as a benchmark CSRM. Thus, a comparative study between high-speed CSRM and TSRMs has been carried out. They have both been prototyped and tested. The findings suggest that the TSRM is superior, considering machine mass and wire temperature management. The TSRM has a better torque output at lower speeds because copper losses are dominant. However, the CSRM has more advantages at higher speeds due to lower iron losses and lower DC voltage requirements. / Thesis / Doctor of Philosophy (PhD)
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Non-Coupled and Mutually Coupled Switched Reluctance Machines for an E-Bike Traction Application: Pole Configurations, Design, and ComparisonHowey, Brock January 2018 (has links)
This dissertation contains a comprehensive analysis of both non-coupled and mutually coupled switched reluctance motors with concentrated windings for an electric bicycle traction application. Multiple pole configurations are analyzed and compared for each motor type. Includes magnetic design, thermal analysis, and structural analysis. A prototype is designed, manufactured, and validated. / This thesis discusses the design of both a conventional non-coupled
switched reluctance motor (CSRM) and a mutually-coupled SRM (MCSRM) for
an exterior rotor e-bike application. Several novel pole configurations were
analyzed for each machine type, and the performance of the final CSRM and
MCSRM designs were compared for this application.
A commercially available e-bike permanent magnet synchronous motor
(PMSM) was purchased, reverse engineered, and validated to define the geometry
constraints and performance targets for the designs. Since switched reluctance
motors do not use rare-earth permanent magnets, they are often seen as a potential
low-cost alternative to permanent magnet machines. The goal of this research is to
explain the relative advantages of CSRMs and MCSRMs when compared to PMSM
machines for a direct-drive e-bike application. The final CSRM and MCSRM
designs are analyzed in detail; electromagnetic, controls, thermal, and structural
considerations are all studied. A prototype of the final CSRM design was
manufactured and validated experimentally, using a dynamometer setup.
The finalized CSRM design is shown to be competitive with the PMSM
machine when considering torque output, and is superior in terms of peak
efficiency, and high speed torque performance. However, the CSRM noise output
and torque ripple were not compared to the PMSM, and a less-common
asymmetric-bridge converter is required for the CSRM, which may hinder the
ability for the machine to be implemented into existing e-bike packages.
The high speed torque performance of the MCSRM is shown to be inferior
to both the CSRM and PMSM, as is the torque quality and efficiency. The MCSRM
is shown to be highly resistant to saturation which gives it the potential for high
torque output at low speed (if thermal limits are not breached), though low
saturation levels also contribute to low machine power factor. The MCSRM may
be better suited to lower speed, high torque applications, for this reason. / Thesis / Doctor of Philosophy (PhD) / This thesis studies the design process and analysis of two different motor
types, for an electric bicycle application. They are designed to replace a
commercially available permanent magnet synchronous motor (PMSM). This type
of motor is typically expensive due to the rare-earth magnet material it requires.
The two motors discussed in this thesis are switched reluctance motors (SRMs),
which do not require magnet material, and thus have the potential to save cost (in
addition to other benefits). One of the SRMs has magnetic fields that are
independently controlled (CSRM), and one has fields that are controlled together
to produce torque (MCSRM). The magnetics, control, thermal, and structural
aspects of the CSRM and MCSRM are studied in detail. Novel geometry
considerations (i.e. novel pole configurations) which impact the magnetics of each
machine are compared to find the best-performing configuration for each machine
type.
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