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:
Jun. 28, 1983
Filed:
Aug. 31, 1981
Manfred Koder, Gerlingen, DE;
Gunther Schmid, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
An arrangement for determining the axial play between the stator and the rotor of an electric motor, especially of a small-size electric motor, includes resilient elements which mount the respective electric motor on a stationary support for oscillatory movement relative thereto, an electromagnet which causes the electric motor to oscillate in a predetermined path at such a frequency and amplitude that, so long as there is an axial play between the rotor and axial bearings thereof, the rotor will conduct movement not only with, but also relative to, the stator, which results in axial impacts between the rotor and the axial bearing and in a complex motion of the stator which has the effect of the impacts superimposed on the basic motion. The arrangement further includes a sensor which detects the complex motion and generates an electric signal representative thereof. The electric signal may then be compared with a reference signal and, in the event of discrepancy, which is attributable solely to the effects of the axial play and the resulting impacts, a command signal may be issued which controls the operation of an automatic device adjusting the position of one of the bearings toward reduction or elimination of the axial play.