Field orientation, VA requirement and magnetic saturation
Akira Chiba
In this chapter some further fundamental aspects of the bearingless motor are discussed. The first point concerns the misalignment of the revolving magnetic field. A phase shift between the detected and actual field orientation produces interference in the two-axis radial force generation which causes operational discrepancies and hence stability problems in the radial position regulation loops. The phase shift may occur if the suspension force constants are not precise and accurate. These constants may vary depending on torque and suspension force outputs. The influence and measurement of the suspension force misalignment are therefore introduced.
In the second section ...
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