2026-09-18T21:47:50Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1519392023-08-24T03:07:59Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Trumper, David L.
Roman, Jean C.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2023-08-23T16:20:41Z
2023-08-23T16:20:41Z
2023-06
2023-07-19T18:45:37.448Z
https://hdl.handle.net/1721.1/151939
0000-0003-1036-4572
This thesis studies a single degree of freedom (DOF), two-pole, three-phase, solid rotor,
induction motor operating in closed loop angular velocity control via a proportional-integral
(PI) controller applying a constant amplitude, variable frequency drive.
The stator consists of six iron teeth, evenly spaced and pointing radially inward, wound
with 160 turns of copper wire each in a three-phase, two-pole configuration. A steel enclosure
houses the stator and is supported by a 3D-printed polylactic acid (PLA) enclosure. The
wiring is initially connected in wye configuration without a neutral wire but later converted
to three independent phases, each with its own input and output wire. The teeth have a
nominal air gap of 0.5mm with the rotor.
The rotor consists of a solid iron cylindrical core with a 1mm aluminum sleeve press
fitted on the outside. Two mechanical bearings center the rotor inside the stator. A single-
input single-output (SISO) PI controller commands three 750 mA amplitude currents with
variable frequency, and offset by 120 degrees to provide a 3-phase drive resulting in a rotating
magnetic field. Each coil is powered by a custom linear transconductance amplifier with 5
kHz bandwidth and 0.3 A/V DC gain.
The controller receives feedback through a contact-less magnetic encoder providing a
linear voltage measurement of the rotor’s angle. We differentiate the position measurement
to estimate the angular velocity of the shaft. A small diametrically magnetized cylindrical
permanent magnet (PM) is attached to the end of the shaft and constrained by a 3-D printed
PLA fixture. During operation, we produced up to 1.6 mNm of torque and velocities of up
to 8,000 RPM.
S.M.
Massachusetts Institute of Technology
In Copyright - Educational Use Permitted
Copyright retained by author(s)
https://rightsstatements.org/page/InC-EDU/1.0/
Single Degree of Freedom Solid Rotor Velocity Control Induction Drive
Thesis
application/pdf
Master
Master of Science in Mechanical Engineering
Publication
unknown
unknown
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<Abstract>This thesis studies a single degree of freedom (DOF), two-pole, three-phase, solid rotor,
induction motor operating in closed loop angular velocity control via a proportional-integral
(PI) controller applying a constant amplitude, variable frequency drive.
The stator consists of six iron teeth, evenly spaced and pointing radially inward, wound
with 160 turns of copper wire each in a three-phase, two-pole configuration. A steel enclosure
houses the stator and is supported by a 3D-printed polylactic acid (PLA) enclosure. The
wiring is initially connected in wye configuration without a neutral wire but later converted
to three independent phases, each with its own input and output wire. The teeth have a
nominal air gap of 0.5mm with the rotor.
The rotor consists of a solid iron cylindrical core with a 1mm aluminum sleeve press
fitted on the outside. Two mechanical bearings center the rotor inside the stator. A single-
input single-output (SISO) PI controller commands three 750 mA amplitude currents with
variable frequency, and offset by 120 degrees to provide a 3-phase drive resulting in a rotating
magnetic field. Each coil is powered by a custom linear transconductance amplifier with 5
kHz bandwidth and 0.3 A/V DC gain.
The controller receives feedback through a contact-less magnetic encoder providing a
linear voltage measurement of the rotor’s angle. We differentiate the position measurement
to estimate the angular velocity of the shaft. A small diametrically magnetized cylindrical
permanent magnet (PM) is attached to the end of the shaft and constrained by a 3-D printed
PLA fixture. During operation, we produced up to 1.6 mNm of torque and velocities of up
to 8,000 RPM.</Abstract>
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