Analysis and Design of Hybrid Machines for DC Generation

Laldin, Omar; Sudhoff, Scott D.; Pekarek, Steven

doi:10.1109/tec.2015.2413295

Cited by 13 publications

(7 citation statements)

References 22 publications

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“…HE machines, which combine high torque density of PM machines and excellent flux controllability of FW electrical-excited machines, are of great interest in variable-speed electric drive systems [98][99][100][101]. An additional degree of freedom, i.e.…”

Section: He Ps-pm Machinesmentioning

confidence: 99%

Overview of novel magnetically geared machines with partitioned stators

Zhu

2018

IET Electric Power Applications

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This study overviews recent development of a new class of magnetically geared machine topologies, i.e. partitioned stator (PS) machines. They are developed from magnetic gears and magnetically geared machines, as well as stator permanent magnet (PM) machines (switched flux, flux reversal, and doubly saliency PM), wound field, or hybrid PM and field winding machines. Based on the operating principle, i.e. magnetic gearing effect/air-gap field modulation and flux switching by the salient rotor iron poles, various PS machine topologies are developed. All have features of two stators, two air-gaps, and one segmented ferromagnetic rotor identical to a magnetic gear's modulating rotor. Their inherent relationships are revealed, while their electromagnetic performance is compared. Both PM and wound field PS machines are discussed, together with hybrid excited PS-PM machines and Vernier machines. It shows that all of these PS machines share the same torque production principle and the differences are mainly in PM configurations and relative positions of two stators. All PS machines have higher torque density per copper loss compared with their counterparts of single-stator machines. PS switched flux PM machines can produce the highest torque density per copper loss. Note: G r is the gear ratio, n i is the number of iron pieces, p 1 is the low-speed element pole-pairs, p 2 is the high-speed element pole-pairs, ω i is the ferromagnetic pieces' angular velocity, ω 1 is the low-speed element's angular velocity, ω 2 is the high-speed element's angular velocity. The negative sign indicates opposite rotating directions.

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Section: He Ps-pm Machinesmentioning

confidence: 99%

Overview of novel magnetically geared machines with partitioned stators

Zhu

2018

IET Electric Power Applications

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“…where g e is the effective air-gap, adjusted using a modified Carter's coefficient [15], which is based on [17] and developed to account for wide slots. Substituting (34) into (35),…”

Section: Air-gap Layermentioning

confidence: 99%

“…These include the stator end-winding leakage and 3-D slot leakage permeances as per [14], the 3-D field leakage permeances, described in Section IV, and the 3-D magnetizing flux using the axially compensated length [15]. However, it is noted that the model has certain limitations; a thermal analysis is presently ignored and the relevant constraints implemented by limiting conductor currents.…”

Section: Introductionmentioning

confidence: 99%

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An Analytical Design Model for Wound Rotor Synchronous Machines

Laldin

Sudhoff

Pekarek

2015

IEEE Trans. Energy Convers.

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Optimization-based design of electric machinery over a large design space requires the use of computationally efficient models to predict machine behavior. In this research, an analytical design model is developed for wound rotor synchronous machines, a key technology for power generation. The model is designed to be used in a rigorous multi-objective optimization algorithm, providing the trade-off between competing mass and loss objectives. A formalized approach is presented to calculate the field distribution, as well as qd-axis model parameters, terminal quantities, loss, and developed torque from design data containing material properties, stator and rotor geometries, and winding layout. The calculated parameters include resistances, inductances, and the back-EMF of the machine. The model is verified using finite element analysis and hardware experiment.

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“…The sliding contacts degrade the system thus effecting the reliability of system. In [ 8 ], the authors discuss drawbacks of machines having brushes and slip rings and thus, stator lodged field excited windings to address this issue. The fractional slot hybrid excited switched flux machine (HESFM) improves the flux weakening capabilities and are discussed in [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Partitioned Stator Switched Flux Machine: Novel Winding Configurations

Irfan

Rehman

Khan

et al. 2020

Entropy

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Torque density is one of the major limiting factors in machine design. In this paper, we propose the hybrid excited partitioned stator switched flux machine3 (HE-PSSFM3). In HE-PSSFM3, armature winding is positioned on the outer stator whereas the permanent magnet (PM) and field winding are placed at the inner stator, while the rotor is free from excitation sources and armature winding. Moreover, concentrated field winding is replaced by toroidal winding. The power splitting ratio between two stators/rotor pole combinations is analytically optimized and are validated through genetic algorithm (GA) in order to enhance average torque and flux regulation capability. The electromagnetic characteristics of the improved and initial design are evaluated and compared with existing designs, i.e., HE-PSSFM1 and HE-PSSFM2. The proposed HE-PSSFM3 has achieved high average torque, i.e., 2.0015 Nm, at same armature and field current densities of 5 A/mm2. The results show that the average torques of the proposed design are 35% and 15% greater than HE-PSSFM1 and HE-PSSFM2, respectively. Furthermore, the analysis of various parameters such as flux linkage, flux regulation, electromagnetic performances, cogging torque, back EMF, electromagnetic torque, and torque ripples are investigated using two dimensional (2D) finite element analysis (FEA). Moreover, the simulation results of the proposed design are validated through GA and analytical modeling.

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Analysis and Design of Hybrid Machines for DC Generation

Cited by 13 publications

References 22 publications

Overview of novel magnetically geared machines with partitioned stators

Overview of novel magnetically geared machines with partitioned stators

An Analytical Design Model for Wound Rotor Synchronous Machines

Partitioned Stator Switched Flux Machine: Novel Winding Configurations

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