Permanent magnet rotor for an electronically commutated DC motor

摘要

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.

主权项

1. A permanent magnet rotor for an electronically commutated direct current motor, the permanent magnet rotor comprising:
a shaft; a laminated rotor core carried by the shaft; permanent magnet plates having a side surface and an edge; rectangular recesses extending tangentially along the laminated rotor core, the recesses being closed over the entire circumference of the laminated rotor core, near its periphery, for accommodating the planar permanent magnet plates, respectively at least one permanent magnet plate being accommodated in each rectangular recess; elongated spring elements made of a magnetic, non-conductive material for holding the permanent magnet plates non-positively without play; clearances defined in the rectangular recesses in the tangential direction, each clearance adjoining a permanent magnet plate and extending over the side surface of the permanent magnet plate; a radially outer ring region and a radially inner ring defined in the laminated rotor core, wherein the ring regions are primarily limited by the rectangular recesses and the clearances and are integral with a core region over thin radial webs; each spring element being accommodated in a portion of the clearance adjoining the permanent magnet plate in the tangential direction; a spring force of each spring element acting predominantly tangentially on the side surface of the permanent magnet plate, each spring element having a first end resting on one side on the side surface of a permanent magnet plate; and each spring element having a second end resting on the other side on one of the webs so as to be without play in the radial direction.