Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 95 for “"commutation"”.
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Commutation Error in Reduced Order Modeling
… diffusion term?'' or in other words ``Do we have commutation error (CE) in the diffusion term?" and ``If so, is the commutation error data-driven correction ROM (CE-DDC-ROM) more accurate than the original DDC-ROM?'' If the CE exists, the DDC-ROM has two different correction terms: one comes from …
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Exponential representations of the canonical commutation relations,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1969.
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Commutation of a Brushless Motor, Using Power Transistors
… and the application of power transistors to the commutation of the winding are considered in this thesis. The arrangement of a conventional d.c. motor is inverted and tappings from the commutated-winding are connected to bipolar switching circuits. The motor has a double-stator feature with …
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The disappearance of railroad commutation in Boston, Massachusetts
Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of City and Regional Planning, 1959.
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Commutation optique dans un cristal photonique à base de silicium
… qu’une distinction majeure dans le genre de commutation produit par chacun. Afin d'utiliser la technique du Z-scan, la durée de l’impulsion-pompe doit être connue. Un but secondaire de ce tavail est donc la construction d’un auto-corrélateur automatisé afin de mesurer ce paramètre. Le système …
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Extending starter motor life via optimization of commutation system parmeters
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1994.
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Finite-particle representations and states of the canonical commutation relations.
Massachusetts Institute of Technology. Dept. of Mathematics. Thesis. 1966. Ph.D.
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A digital computer program for the computation of commutation tables
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Mathematics, 1956.
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High Bandwidth Rogowski Coils, Commutation Loop Stray Inductance, and the Si IGBT and the SiC MOSFET Based Hybrid Concept
… electronics. It then focuses on the current commutation loop inductance, underscoring the importance of minimising this parameter to optimise the design and efficiency of converters and modules, especially when employing WBG power devices in high-speed applications. The thesis introduces …
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3D Commutation-Loop Design Methodology for a SiC Based Matrix Converter run in Step-up mode with PCB Aluminum Nitride Cooling Inlay
This work investigates three-dimensional power loop layout for application to a SiC based matrix converter, providing a symmetric, low-inductance solution. The thesis presents various layout types to achieve this design target, and details the implementation of a hybrid layout to the matrix …
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Direct current hybrid vacuum breaker
… interruption without an arc, like with a voltage commutation approach. The main difference is whether or not the interruption mechanism deals with the arc. Interrupting the arc not only causes erosion of the electrode surface, therefore reducing useful lifetime, but also introduces uncertainty to …
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Characterization and control of a new high-torque motor for autonomous wearable robotics
… when driven with balanced three-phase sinusoidal commutation. A set of optimized commutation waveforms are developed based on an independent phase control strategy, and it is shown that this strategy can eliminate ripple in simulation and reduce it in practice (M: 7.8%, SD: 0.5%), without …
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Constant-frequency parallel-resonant converter (clamped-mode)
… to output, boundary conditions for natural commutation and forced commutation, and stresses on power devices. These characteristics are experimentally verified and simulated by using IO-SPICE. Considerations for practical design are discussed based on hardware operating at 300KHz, with a …
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Acoustic minimization of Ocean Twilight Zone Vehicle, Mesobot
… In this thesis, I have analyzed the effect of commutation methods and propeller design on the acoustic noise radiated from a single BlueRobotics T200 thruster. The propeller design choices are a standard three-blade propeller and a three-blade toroidal propeller. The commutation methods …
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Acoustic Minimization of Ocean Twilight Zone Vehicle, Mesobot
… In this thesis, I have analyzed the effect of commutation methods and propeller design on the acoustic noise radiated from a single BlueRobotics T200 thruster. The propeller design choices are a standard three-blade propeller and a three-blade toroidal propeller. The commutation methods …
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A Study of Modifications to Quantum Mechanics
… into two categories: ones in which the canonical commutation relations between position and momentum are deformed and ones in which the space of states used are vector spaces over Galois fields instead of complex Hilbert spaces. The particular deformation of the canonical commutation relations …
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Induction motors with modulated terminal voltage
… high speed solid state switches for the forced commutation of current in AC power circuits it has become feasible to apply forced commutation techniques to the frequency and voltage control of induction motors as variable speed drives. The availability of these methods raises questions regarding …
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Power electronic transformers for AC-AC and AC-DC conversion with reduced number of switches
… primary or secondary of the transformer requires commutation of the transformer inductive currents. This problem of leakage energy commutation and the required protection are studied in detail in this thesis. Other features of this converter are bi-directional power flow and power factor …
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Bosonization in 1 + 1/2 dimensions
… currents on the half-line and derive their commutation relations for a system with a boundary. We compute the fermion determinant of the fermionic fluctuations for a system with a boundary using Forman's approach. We find that the degrees of freedom induced at the boundary do not modify the …
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Study of superconducting fault current limiters in power systems
… SFCL has proved to be effective in preventing commutation failure in DC grid. Prior research done on the influence of SFCL on commutation failure has shown that it can mitigate commutation failure to some extent, but here we demonstrate R-SFCLs with correct resistance values can entirely solve …
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