Permanent magnet rotor for an electronically commutated DC motor

US9621002B2 · kind B2 · utility

Assignee

• BÜHLER MOTOR GMBH · DE

Inventors

• Thomas Schreiber · Berlin, DE
• Georg Bonk · Oberasbach, DE

Key dates

• Filing date: Aug 18, 2015
• Grant date: Apr 11, 2017
• Expiry date: Nov 20, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K1/276
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

In a DC motor, a permanent magnet rotor comprising a shaft, a rotor sheet packet supported by the shaft, which rotor sheet packet comprises close to the periphery thereof completely closed and tangentially extending rectangular recesses for receiving planar permanent magnet plates. At least one permanent magnet plate is accommodated in each recess, the permanent magnet plates are held by spring elements free of play by force locking, the recesses have free spaces connected to the permanent magnet plates in the tangential direction, which free spaces extend across the major part of the side surfaces of the permanent magnet plates and the rotor sheet packet consists essentially of a radial outer annular region and a radial inner core region, wherein the annular region in a large part is delimited by the recesses and the free spaces and is integral with the core region via thin radial webs.