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:
Mar. 23, 2004
Filed:
Oct. 02, 2002
Karl Rothamel, Ober-Ramstadt, DE;
Gottfried Kühn, Weiterstadt, DE;
Snap-On Equipment GmbH, , DE;
Abstract
The invention relates to a device for measuring a rotor imbalance. Said device comprises a main shaft which is rotatably mounted in a machine housing and to which the rotor to be measured is fixed, a single-phase alternating-current motor for driving the main shaft, with a single-phase winding ( ) and an auxiliary winding ( ) which is offset in phase for driving the main shaft ( ) up to measurement speed and a control device ( ) that adjusts the current of the motor. Said control device ( ) has an assembly ( ) which reduces the supply current delivered to the two windings ( ) of the motor ( ) once the measurement speed has been reached, in such a way that the motor creates a reduced torque which substantially compensates a speed drop produced by friction and drag.