The master's thesis presents the design and validation of a magnetic absolute encoder in side shaft mounting, used for the control of a permanent magnets synchronous machine. In the introductory part, the operation of the side shaft magnetic encoder is presented as well as the requirements according to which the discussed encoder MAQ470 was selected.
The printed circuit board design is presented, which allows the mounting of the encoder integrated circuit in the selected housing. In next chapters the process of selecting a magnetic ring for the selected encoder is presented.
This is followed by the construction of mechanical adjustments for the implementation of the selected encoder and magnetic ring on the test electric motor to perform measurements.
The next section presents the measurements performed on the dynamometer, with which the encoder error at different axial positions of the magnetic ring was measured and also the influence of phase currents on the encoder error was examined. An SSI communication test with a company controller was also performed.
This is followed by the measurements of the absolute encoder error on the encoder validation device in the laboratory of control engineering and power electronics (LRTME).
The results of all performed measurements showed and order of magnitude worse encoder accuracy than we expected it from the parameters of the device. In last chapters the measurement of the magnetic field caused by the magnetic ring is described. With measurement, we checked and confirmed that the main reason for the poor accuracy of the magnetic encoder derives from the prototype magnetic ring.
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