Patent ID: 9148039
Filing Date: 2015-09-29
Classification: H02K

Abstract:
1. A motor assembly comprising: a synchronous motor having a shaft; a working part with a hollow body; a driving member having at least one driving tooth; at least one driven tooth; and at least one middle member; wherein the at least one driving tooth projects outwardly from a cylindrical hub of the driving member fixed relative to the shaft; the at least one driven tooth projects inwardly from the hollow body, the distance between an axis of the shaft and all points on an inner surface of the driven tooth is greater than the distance between the axis of the shaft and all points on an outer surface of the driving tooth so that the at least driven tooth is radially spaced from the at least one driving tooth; and the at least one middle member is disposed between the cylindrical hub and the hollow body and arranged to allow up to a predetermined range of relative angular motion between the driving member and the working part before causing an interference between the at least one driving tooth and the at least one driven tooth whereby the driving member is able to drive the working part.