Sensorless vector control of surface mounted permanent magnet machines without restriction of zero frequency
Silva, César Armando (2003) Sensorless vector control of surface mounted permanent magnet machines without restriction of zero frequency. PhD thesis, University of Nottingham.
Permanent magnet motors have a series of characteristics that make them attractive for the use in industrial drives: low maintenance, high dynamics, small size and mass to power ratio. In particular its higher efficiency means that permanent magnet synchronous motors may be used instead of electro-magnetically exited motors (such induction machines or commutator DC motors) in applications where the energy savings compensate the higher initial cost. Nevertheless, the need for a shaft mounted position measurement to perform the orientation of the control of the synchronous machine is of concern, because it increases the total drive cost and reduces reliability.
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