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:
Aug. 21, 1984
Filed:
Jan. 29, 1982
Hans Lamatsch, Nuremberg, DE;
Helmut Schmidt, Reichenberg, DE;
Bodo Ulrich, Lengfeld, DE;
Karl-Heinz Braungardt, Wurzburg, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An improved stator for an electric polyphase motor, particularly a stepping motor, is disclosed. The stator includes a pole piece star having axially integral pole pieces arranged in star-like fashion around the hollow cylinder with the radial inner ends of the pole pieces located in the hollow cylinder and protruding a pre-determined small distance beyond the inner wall of the hollow cylinder. Thus, the hollow cylinder is set back from the radial inner edges of the pole pieces to provide minimum sized air gaps without requiring finishing operations on the cylinder after the motor is assembled. The radial outer ends of the pole pieces are welded to the surrounding ring housing by laser beam welding. The hollow cylinder is disclosed as an injection-molded part with the pole pieces molded therein simultaneous with the injection molding. A core mold for the cylinder is also disclosed.