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 28 for “"Torque Ripple"”.
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Active torque ripple reduction in permanent-magnet AC motors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Torque-ripple compensation for an axial-airgap synchronous motor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Optimum Control for Minimization of Torque Ripple in Synchronous Reluctance Machines
… an analysis for identifying the sources of torque ripple in electric machines. It includes the effect of conductor distribution in the machine, magnet flux density distribution, current harmonics and non-idealities in position and current sensors. Harmonic orders and magnitudes of torque …
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An open-loop method for reduction of torque ripple and an associated thermal-management technique
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Control of Pseudo-Sinusoidal Switched Reluctance Motor with Zero Torque Ripple and Damped Input Current Ripple
… cost advantage and ruggedness. However, the torque ripple and bus current ripple of SRM restrict its application range compared with traditional AC and DC motors due to the doubly salient pole structure and the highly non-linear coupling between torque, rotor position and phase current. As a …
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DC Reluctance Machine — A Doubly-Salient Reluctance Machine with Controlled Electrical and Mechanical Power Ripple
… failure-prone electrolytic capacitors, (2) large torque ripple, and (3) acoustic noise. Conventionally, these drawbacks have been addressed independently either through (1) excitation control or (2) machine design, but not as a holistic system or solution. This disseratation presents a design for …
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Resonance Compensation of Large AC Drivetrains with Significant Time Lag
… offer the possibility of higher speed and torque response over their DC counterparts. The price to be paid, however, is torque ripple which is a function of the operating frequency. Even a small value of ripple, at an underdamped plant resonant frequency, may be multiplied by the plant "Q" …
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Mitigation of Asymmetrical Currents in Permanent Magnet Synchronous Machine with Unbalanced Stator Winding Impedance for Electric Vehicle Application
… noise, uneven heating of the motor phases, and torque ripple appear in the PMSM drive. These effects reduce the reliability, efficiency, and lifespan of the machine. The conventional proportional-integral (PI) current controller in a PMSM drive is unable to mitigate the imbalanced stator current …
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Design of a PC based Data Acquistion System for a Switched Reluctance Motor
… SRM drives. System efficiency, electromagnetic torque, torque ripple, output and losses are some of the required measurements.
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Modeling and analysis of source-commutated five-phase diode rectifier systems
… alternator. Based upon the finding that torque ripple is a dominant noise source, effort has been focused upon creating a machine-rectifier system that has maximum output power and minimal acoustic noise."--Abstract, page iii.
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Design of a Vernier Permanent Magnet Wind Generator
… machine has inherent properties such as high torque density, sinusoidal induced voltages and low torque ripple which makes it suitable for low-speed direct-drive wind applications. Additionally, its mechanical structure is as simple as a conventional permanent magnet (PM) machine, whilst …
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Control of Switched Reluctance Motors Considering Mutual Inductance
A novel torque control algorithm, which adopts a two-phase excitation, is proposed to improve the performance of the Switched Reluctance Motor (SRM) drive. By exciting two adjacent phases instead of single phase, the changing rate and the magnitude of the phase currents are much reduced. Therefore …
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Analysis and Modelling of Fractional-Slot Concentrated-Wound Interior Permanent Magnet Machines
… for its operational inductances, electromagnetic torque, torque ripple and their respective subcomponents, as a function of the machine geometry and design parameters. Both normal operation of the machine and open-phase fault condition are considered in the aforementioned formulations. A “maximum …
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An Efficient Wide-Speed Direct Torque Control Based on Fuzzy Logic Technique
Conventional Direct Torque Control (CDTC) system faces the problems of high flux and torque ripples, and has difficulty in improving the performance of dynamic torque response and control flux locus at very low speed. Under field weakening condition, when the speed is beyond the rated speed, the …
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High performance induction machine control: Methods, limits and solutions
… high speed DTC operation, including excessive torque ripple and diminished torque capability of the drive method. Asymptotic-input-output-decoupling is proposed to improve this erratic DTC performance. The results show that asymptotic decoupling compensates for erratic DTC performance with …
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Characterization and control of a new high-torque motor for autonomous wearable robotics
… lower-extremity robotics designers for its high torque density and low winding resistance. Unfortunately, deliberate asymmetries in the design make finite-element modeling of this topology largely intractable. An ATFM prototype was characterized experimentally using a custom dynamometer and …
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Comparison of interior permanent magnet synchronous machines for a high-speed application
… they offer such as higher efficiency, output torque and, output power. This dissertation discusses the electrical and magnetic design of permanent magnet machines and the design and analysis of two 10 kW, 30000 rpm Interior Permanent Magnet (IPM) machines. This dissertation consists of two …
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Direct Torque Control for Silicon Carbide Motor Drives
<p>Direct torque control (DTC) is an extensively used control method for motor drives due to its unique advantages, e.g., the fast dynamic response and the robustness against motor parameters variations, uncertainties, and external disturbances. Using higher switching frequency is generally …
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A Brushless DC Motor Drive Without a DC Link Capacitor
… switch control technique that allows speed and torque control of the BLDC motor is adopted. The proposed technique is simulated and experimentally validated. Also, a comprehensive performance comparison is carried out between the proposed technique and the conventional techniques. Although the …
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Analysis, Simulation, and Measurement of Micro-Vibrations in Reaction Wheels for High-Performance Imaging Missions
… vibrations, resulting from mechanical unbalance, torque ripple, and bearing imperfections, propagate through the satellite structure and induce line-of-sight (LoS) jitter. This thesis presents the analysis, simulation, and measurement of reaction wheel micro-vibrations to characterise their effect …
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