Systems Design, Fabrication, and Testing of a High-Speed Miniature Motor for Cryogenic Cooler

Figure 13

Critical speed map shows the variation of 1st, 2nd, and 3rd bending modes as a function of bearing stiffness (Stiffness is N/mm). At the assumed bearing stiffness of 100 000 N/mm, the 1st and 2nd bending critical speeds correspond to ~245 K rpm and ~618 K rpm, respectively, as shown in Figures 11 and 12.