The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2024
Filed:
Jul. 03, 2020
Edwards Japan Limited, Yachiyo, JP;
Katsuhisa Yokozuka, Yachiyo, JP;
Yoshinobu Ohtachi, Yachiyo, JP;
Yasushi Maejima, Yachiyo, JP;
Tsutomu Takaada, Yachiyo, JP;
Edwards Japan Limited, Yachiyo, JP;
Abstract
A vacuum pump and a washer which can reduce vibration of a rotor and the rotor which can reduce the vibration are provided. When an inertia moment ratio which is a ratio between the inertia moment around a z-axis and the inertia moment around an x-axis or a y-axis is larger than 1, a natural frequency ωdoes not match a rotational frequency Ωbut goes away from that. When the natural frequency ωmatches the rotational frequency Ω, the rotor vibrates and thus, a fatigue failure occurs in a rotor blade. When the rotor is to be made larger in a radial direction of a rotating shaft, a value of the inertia moment ratio is set to a value larger than 1.