Abstract The disclosure relates to a process for securing a stack of rotor laminations on the shaft of a small motor. The binding of the laminations on the shaft is effected by inserting a shaft having a smooth surface into a stack of laminations, each lamination having a central bore and a dished portion around such bore, by applying to the stack of laminations in the region remote from the central bore a predetermined pressure, by heating at a predetermined temperature in a very short time interval the stack of laminations, and by applying a high pressure to the stack of laminations in the region of the central bore to compress the dished portion of the laminations and so produce a binding of the laminations on the shaft.
Process for securing a stack of rotor laminations on the shaft of a small motor comprising the steps of: a. inserting a shaft having a smooth surface into a stack of laminations, each lamination having a central bore and being slightly dished around said bore so as to form a protrusion with reSpect to the plane of the lamination and fitting over said shaft without bending; b. applying a suitable pressure to the stack of laminations in the region remote from the central bore; c. heating at a predetermined temperature the stack of laminations under pressure, in a very short time interval in order to avoid the heating of the shaft; and d. applying immediately after heating a high pressure to the stack of laminations in the region of the central bore to compress the hot dished portion of each lamination so as to flatten it and insure contact of the central bore with the cold shaft.
Claim 2
Dependent Claim
157 words
Process for securing a stack of rotor laminations on the shaft of a small motor comprising the steps of: a. inserting a shaft having a smooth surface into a stack of laminations, each lamination having a central bore and being slightly dished around said bore so as to form a protrusion with reSpect to the plane of the lamination and fitting over said shaft without bending; b. applying a suitable pressure to the stack of laminations in the region remote from the central bore; c. heating at a predetermined temperature the stack of laminations under pressure, in a very short time interval in order to avoid the heating of the shaft; and d. applying immediately after heating a high pressure to the stack of laminations in the region of the central bore to compress the hot dished portion of each lamination so as to flatten it and insure contact of the central bore with the cold shaft.