Rotor for an electric motor, an electric motor and a production process for an electric motor

US8975800B2 · kind B2 · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Reinhard Riedl · Finning, DE
• Jochen Erhardt · Klosterlechfeld, DE

Key dates

• Filing date: Jul 14, 2011
• Grant date: Mar 10, 2015
• Expiry date: Nov 16, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49012
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A rotor (100) for an electric motor (1000). The rotor (100) has a rotor shaft (10) and a rotor core (20) attached onto the rotor shaft (10). The rotor core has a plurality of core laminations (40, 140) arranged along an axis (A) of the rotor core (20), and has a plurality of poles of at least one pole pair, the core lamination (40, 140) having:a central recess (70, 170) through which the rotor shaft (10) passes and which has a contour (71, 171) as well as adjacent areas (AF), and a plurality of receiving structures arranged at peripheral angular positions in order to each form a receiving element for a pole-forming element on the rotor core (20). In this context, it is provided according to the invention that the rotor core has a surface (OF) facing the rotor shaft (10) that is formed together with the adjacent areas (AF) of the central recess (70, 170) of the plurality of core laminations (40, 140), and that has uneven areas crosswise to the axis (A) of the rotor core (20) that are formed by the contours (71, 171) of the central recesses (70) of the plurality of core laminations (40, 140). The contours (71, 171) of the central recesses (70, 170) of at least a first core lamination…