First, exclusive investigations are performed in this paper on a developed prototype of an axial flux switched reluctance machine to elicit the issues of low inductance ratio due to higher leakage flux in this type of machine. Thereafter, three different novel approaches based on a special winding configuration, segmented grain-oriented steel core and magnetic shielding are proposed to mitigate the leakage flux. These approaches are then tested individually using 3-D FEA. In addition, comparative performance analysis of the original machine model and the machine with each of these approaches is carried out.
Growing concerns due to environmental impact of extensive fuel combustion by on-road transportation have emphasized the need for alternative solution to the on-board power generation. This paper proposes a novel method to generate electricity on board a vehicle by using local changes in pressure and shape of a pneumatic tire while vehicle is moving. Arrangement of a set of generators incorporated inside a vehicle's wheel is fully demonstrated in this paper. The paper proposes different generator configurations, and presents preliminary design and development of a linear permanent magnet generator using Finite Element Analysis.
Switched reluctance motors (SRMs) have been gaining increasing popularity and emerging as an attractive alternative to traditional electrical motors in hybrid vehicle applications due to their numerous advantages. However, large torque ripple and acoustic noise are its major disadvantages. This paper presents a novel five-phase 15/12 SRM which features higher power density, very low level of vibration with flexibility in controlling the torque ripple profile. This design is classified as an axial field SRM and hence it needs three-dimensional finite-element analysis model. However, an alternative two-dimensional model is presented and some design features and result are discussed in this paper.
Switched reluctance motors (SRMs) show crucial attributes to applications where light weight, high-temperature adaptability, fault-tolerance capability, ruggedness, and simplicity are strongly required. The axial-flux configuration of SRM has additional features over the radial-flux configuration. This paper presents the design and analysis of a novel axial-flux SRM. Detailed procedures of deriving the output power equation as a function of the motor dimensions and parameters are provided. A modified phase winding design approach is thoroughly explained, a flowchart describing the design algorithm is presented, and the inductance determination by different methods is verified experimentally. The 3-D finite-element analysis (FEA) unveils the excessive end core and radial-flux fringing effects in the axial-flux configuration. An exclusive pole-shape design is also proposed. The operation of the motion model using 3-D dynamic FEA is analyzed, and its prototype development process and static testing are demonstrated.
In this era of electrified transportation, switched reluctance motor (SRM) is emerging as a prospective replacement to traditional electric motors especially for large heavy duty vehicles such as the electric bus. This paper proposes the design and analysis of a novel outer rotor in-wheel SRM. The integration of the motor housing inside the wheel rim saves significant space and eliminates the need for additional mechanical parts used in the centralized drive. The developed concept of short flux path configuration in this research manuscript has shown additional important features compared to previous SRM designs and a substantial increase in efficiency is reported. The procedures of deriving the output power equation as a function of the motor dimensions and parameters are explained in detail. Comparative finite element analysis (FEA) has been performed between the developed machine and a commercially available conventional SRM to elicit the merits of the developed machine. The results obtained through FEA investigations show that there is a reduction of torque ripple and a considerable increase in motor efficiency.
The concept of electrified vehicles (EVs) is the best old "new" idea that has been around for the last century. Designs have changed to make EVs popular, but until now, no design has captured the public's imagination or gained market traction. This is because consumers need more than facts about EVs; they need to be wooed into making a bigger commitment to the EV. The winning combination of making the EVs indispensable to the average North American consumer can be found in accessible charging infrastructures, reliable long-life batteries, and increased mileage. Vehicle manufacturers want a better-quality Ev to offer consumers to increase market penetration. Engineers and policy makers, to make this relationship a reality, need to appeal to more than just consumers' minds and go beyond testing and performance statistics and test results.
Switched reluctance motors (SRMs) show crucial attributes to some applications where light weight, high temperature adaptability, fault tolerance capability, ruggedness, and simplicity are strongly required. The axial-flux configuration has shown additional features. This paper presents the design improvement and analysis of the novel axial-flux SRM, that was presented in previous work. Detailed procedures of deriving the output power equation as a function of the motor dimensions and parameters are provided. The phase winding design approach is thoroughly explained, and a flowchart describing the design algorithm is also presented. The three dimensional finite element analysis unveils the excessive end core effect in the axial-flux configuration. Improvements on the pole shape design are also proposed.
In this paper, a novel current tracking strategy for switched reluctance motor (SRM) is proposed, analyzed and verified. The relationship between pulse-width modulation (PWM) duty ratio and current variation in SRM over a cycle is investigated. The results demonstrate that an analytical resolution for calculating the duty ratio to achieve accurate current tracking is not possible because of the nonlinear inductance profile of SRM. Consequently, an iterative learning current control method is proposed, that can calculate the optimum duty ratio for tracking the reference current through periodical learning at different rotor positions in real-time. The learning gain for this proposed iterative learning-based current control algorithm is investigated and its upper limit is calculated by considering system convergence. In addition, an improved average current tracking strategy is presented in this paper. The numerical analysis performed in this paper clearly demonstrates the effectiveness of the proposed current control method for different speed and loading conditions.
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