Method for building magnetic core including laminations bound into packs for electrical machine

摘要

A method for building a magnetic core including laminations bound into packs for an electrical machine comprises steps of: stacking a group of laminations one on top of the other to build the core; binding into a pack the group building the core by locking members that axially compress the group with a predetermined clamping force; pre-compressing, before clamping the pack by the locking members, the group by a pre-compression press that is independent and separate from the locking members; measuring an axial length of the group while the group is being compressed by the pre-compression press; initially forming the group with a normally lacking number of laminations to initially have the measured length that is lower than or substantially equal to a desired length; and adding, after having completed pre-compression, an additional number of laminations to the group determined according to a difference between the desired and measured lengths.

主权项

1. A method for building a magnetic core (8) including laminations (9) bound into packs for an electrical machine (1), said method comprising steps of:
stacking a group of laminations (9) one on top of the other to build the magnetic core (8); binding into a pack the group of laminations (9) building the magnetic core (8) by locking members (10) that axially compress the group of laminations (9) with a predetermined clamping force; pre-compressing, before clamping the pack by the locking members (10), the group of laminations (9) by a pre-compression press (11) that is independent and separate from the locking members (10); and measuring an axial length of the group of laminations (9) while the group of laminations (9) is being compressed by the pre-compression press (11) and before binding the group of laminations (9) by the locking members (10); initially forming the group of laminations (9) with a normally lacking number of laminations (9) to initially have the measured axial length that is normally lower than a desired axial length; adding, after having completed pre-compression, an additional number of laminations (9) to the group of laminations (9) determined according to a difference between the desired axial length and measured axial length; and binding the group of laminations (9) forming the magnetic core (8) into packs by means of the locking members (10) after having added the additional laminations (9) to the group of laminations (9).