Technique for on-the-fly start-up of a permanent magnet AC motor without a speed or position sensor
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United States of America Patent
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Feb 7, 2023
Grant Date -
Dec 3, 2020
app pub date -
May 31, 2019
filing date -
May 31, 2019
priority date (Note) -
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Abstract
A method and apparatus are provided for controlling a sensorless multi-phase permanent magnet (PM) motor by sensing induced motor terminal voltages from the PM motor while the rotor is spinning, generating an input voltage vector signal from the plurality of induced motor terminal voltages, projecting the input voltage vector signal to a transformed voltage vector signal which does not include DC-offset components by using a Clarke transformation without a zero component that is applied to the input voltage vector signal, and estimating an initial rotor position of the rotor from the transformed voltage vector signal, wherein said sensing, projecting, and estimating are performed while a power converter for the sensorless multi-phase PM motor is disabled.
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