Sensorless control of an interior permanent magnet synchronous motor with a three level t-type inverter
Zhao, Junhan
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https://hdl.handle.net/2142/120431
Description
Title
Sensorless control of an interior permanent magnet synchronous motor with a three level t-type inverter
Author(s)
Zhao, Junhan
Issue Date
2023-05-01
Director of Research (if dissertation) or Advisor (if thesis)
Haran, Kiruba Sivasubramaniam
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Sensorless control
IPMSM
T-type inverter
SVPWM
Abstract
An encoder or resolver is widely utilized for the rotor position and speed feedback in permanent magnet synchronous motor control. However, these sensors sometimes increase the system’s cost, size, and complexity. Sensorless control is an alternative strategy, which estimates the rotor position and speed through multi-physical parameters. However, sensorless control requires less harmonic distortion in the motor current and voltage, leading to a large power filter, which further increases the system’s size. Therefore, an advanced power electronics typology with less THD is also critical for high accurate sensorless control motor system. Another challenge for sensorless control is the transition between open-loop starting from zero
speed and closed-loop control. An unceremonious transition will lead to motor nonalignment and generate significant vibration. The experimental prototype consists of a three-level
T-type inverter and a high-power IPMSM, which demonstrated a smooth transition between the open-loop control and closed-loop sensorless control with a speed error of less than 5rpm and an accurate sensorless closed-loop control with an error of less than 1rpm, with the help of a flux linkage observer.
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