Patent ID: 8690525

Claim:
A vacuum pump, comprising: a casing provided with an inlet port and an outlet port; a stator portion provided inside the casing; a rotor portion having a shaft rotatably supported inside the casing, and a rotor disposed on the shaft and provided with a gas transfer mechanism that transfers a gas from the inlet port to the outlet port, the rotor portion being arranged with a predetermined clearance between the rotor portion and the stator portion; a motor rotating the shaft; vibration detection means for detecting vibration, disposed in the stator portion, by converting vibration amplitude to an electric signal; and contact detection means for judging an occurrence of contact between the stator portion and the rotor portion when, in the vibration detected by the vibration detection means, an amplitude in frequency of a specific vibration caused by contact between the stator portion and the rotor portion exceeds a predetermined threshold value.