Patent ID: 9621002
Date: 2017-04-11
CPC Classifications: H02K

Claim:
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.