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 46 for “"stepper motor"”.
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Dynamics modeling and analysis of a Sawyer linear stepper motor
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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Modelling and control of a hybrid stepping motor
… of a microprocessor and a medium power stepper motor in one control system brings together two quite different disciplines. Various methods of interfacing are examined and the problems involved in both hardware and software manipulation are investigated. Microprocessor open-loop control …
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The design and application of servo systems using stepper motors
… essentially analogue in nature. Developments in stepper motors and semiconductor techniques have resulted in digitisation being possible. This thesis describes the stepper motor, its performance, and its application to position control systems in which the error signal is of a single polarity and …
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Design of a re-configurable test stand for a multi degree of freedom compliant robot prototype
… on the robot's DOF, the final design utilizes a stepper motor and a counterweighted pulley system to apply a compressive force through a single monofilament line. The test stand can accommodate prototypes up to 25 cm in length, and can apply a compressive force up to 6.5N with a resolution of …
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Design and development of a precision packing stage and master control system for an automated vial packaging machine
… TM] Leonardo with externally integrated stepper motor controllers. Finally, a machine vision system was integrated to provide information on product packaging quality and machine performance metrics.
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A method for in situ SEM fracture studies of brittle materials using the double torsion technique : application to nuclear graphite
… still providing free rotation of the attached stepper motor. Crack growth rates of down to 19nm/s were directly observed in PMMA specimens. It was concluded that the technique displayed merit in its ability to contribute to the knowledge base of slow cracking and damage development in brittle …
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Methods for Increasing Sensitivity and Throughput of Solid-State NMR Spectroscopy of Pharmaceutical Solids
… being shuttled through the magnet bore with a stepper motor, and exhibited signal to noise ratio (SNR) values comparable to current probes. Pharmaceutical relevance was demonstrated by acquiring spectra of ibuprofen and aspirin simultaneously. 19F SSNMR was used to examine low-level amorphous …
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Mechanically driven pendula for instructional laboratories
… made to oscillate along a horizontal line by a stepper motor and micro-controller. The pendulum pivot therefore has a position that varies sinusoidally with time with a constant, adjustable frequency. I designed and constructed the experiment to be easily implemented into any physics lab. I …
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Design and fabrication of a pencil shoulder cutting device for a novel endcap
The pencil shoulder cutting device is a stepper motor driven mechanism to cut a small groove into the end of a pencil, which is needed for a novel seed-capsule endcap for a new pencil called Sprout. The pencil was developed by a team of MIT graduate students, and the shoulder cutting device is one …
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Design of Motor Controller for Intragastric Applications
… design and possible utility of an intragastric motor controller which has the capability to remain within the stomach for long periods of time performing simple tasks or acting as a long term stomach health monitor. This device was designed using a custom PCB which would be powered by a Li-ion …
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Investigating silicone oil emulsification in eye chamber models
… A 3D model of the eye chamber, driven by a stepper-motor reproducing the eye geometry and saccadic motion, was developed to study the first hypothesis of bulk emulsification at the interface between oil-aqueous phases. The stability of the interface was investigated over an extensive range …
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Ferrohydrodynamic flows in uniform and non-uniform rotating magnetic fields
… applications as rotary and exclusion seals, stepper motor dampers, and heat transfer fluids. Recent research demonstrates ferrofluid use in alternating and rotating magnetic fields for MEMS/NEMS application of microfluidic devices and bio-applications such as targeted drug delivery, enhanced …
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Design of a small-scale continuous linear motion pharmaceutical filtration module
… onto a linear guide assembly and driven by a stepper motor to filter the API mixture through a porous metal filter. The mixture enters into the middle of the filtration unit; the excess ethyl acetate and dissolved contaminants are pulled through the filter by a vacuum pump, leaving the desired …
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Characterization of the deuteron beam current in a linear accelerator for nuclear-diagnostic calibrations
… Besides the Faraday Cup, a target movement stepper motor was also successfully installed and tested, their LabView based control programs were written, and their operation procedures were documented. The secondary electron suppression capability of the cup was successfully tested as well. …
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Design, measurement, and analysis of oxygenated fluid pump system
… polyurethane bellows, which is powered by a stepper motor. A peristaltic pump simultaneously pumps saline fluid in another branch of the system. The two branches come together, the fluids are mixed, and bubbles are removed before the fluid is ready to be injected into a patient. Solid …
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Design of an STM and EPL control system and linear actuator preload diaphragm
… on the integration of the HexFlex, a micron stepper motor, precision mounts, a preload diaphragm, and an advanced control system capable of automated EPL and STM verification. Steady electron tunneling is first demonstrated, followed by STM imaging functionality. However, high-speed, …
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Autonomous tactile object exploration and estimation using simple sensors
… the difficulties inherent in force control on a stepper motor robot. A Kalman filter based quadric shape estimator was then used to describe the objects encountered in the MERLIN's workspace. The minimization of a cost function based on the shape estimator's uncertainty guided the robot along an …
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Reynolds stress measurements in a turbine tip leakage vortex
… at a large number of data points. A geared stepper-motor drive mechanism was used to rotate the endflow hot-wire probe about its axis. Performance of the probe and the data analysis routines was verified by measurements in a fully developed pipe flow. The contribution of turbulence to the …
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Preparation And Characterization Of Cigss Solar Cells And Pv Module Data Analysis
… on a soda lime glass substrate using a stepper motor control for better uniformity. Further, selenization/ sulfurization of these precursors was carried out using rapid thermal processing (RTP). CIGS films were sulfurized using chemical bath deposition (CBD). ZnO:Al was deposited on the …
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Electro-Mechanical Design and Testing of a Prototype Low-Cost Rheometer
… prototype used an encoded direct current (DC) motor to rotate at a constant rate while measuring the motor current draw to estimate torque and was able to measure a fluid viscosity standard with η = 100 Pa.s within 17% of the known value. The second prototype used a microstepping stepper motor …
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