Patent ID: 6768238
Filing Date: 2004-07-27
Classification: H02K

Abstract:
A punched sheet metal unit for electrical machines comprisinga substantially ring-shaped punched sheet metal plate having a central opening adapted to receive a shaft; a plurality of recesses formed in the sheet metal plate and arranged in a circumferential direction of the sheet metal plate, each of said recesses adapted to receive at least two permanent magnets, at least one of the recesses being open at a peripheral edge of the sheet metal plate; an intermediate sheet metal segment arranged between the at least two permanent magnets, said intermediate sheet metal segment having a peripheral edge and an inward edge facing the opening; a plurality of separation sheet metal segments, which separate the recesses from each other and are formed as a single piece with the punched sheet metal plate, at least one of the separation sheet metal segments has at least one tangentially arranged nose formed proximate to the peripheral edge of the sheet metal plate, said nose adapted to secure at least one of the permanent magnets disposed in the at least one recess; and at least one holding element received in a corresponding recess and adapted to hold the at least two permanent magnets in the recess in a predetermined position, wherein an air gap is formed between the inward edge of the intermediate sheet metal segment and an edge of the recess proximate to the opening when the at least two permanent magnets are inserted so as to contact the respective recesses, and wherein a first mounting recess is provided on the inward edge of the intermediate sheet metal segment and a first second mounting recess is provided on the edge of the recess proximate to the opening, said first and second mounting recesses adapted for engagement with the holding element.