Permanent magnet unit for an electrical machine, a method of installing permanent magnet units and a rotor of an electrical machine
AssigneeABB AB
InventorPekka Kanninen
Life of this patent
Estimating the term…
Abstract
A permanent magnet unit is provided for an electrical machine. The electrical machine includes a stator and rotor. At least one permanent magnet is enclosed in a non-magnetic enclosure. The enclosure has means for connecting it to at least one other substantially similar enclosure containing a permanent magnet.
Claims20
A permanent magnet unit for an electrical machine, said electrical machine comprising a stator and a rotor, wherein said permanent magnet unit comprises:
- an enclosure including a first enclosure which contains at least one first permanent magnet enclosed therein, a substantially similar second enclosure which contains at least one second permanent magnet enclosed therein, and a connection mechanism configured to connect the first enclosure enclosing the at least one first permanent magnet therein to the second enclosure enclosing the at least one second permanent magnet therein.
A method of installing permanent magnet units into an electrical machine, said electrical machine comprising a stator and a rotor, said rotor having a shaft and said rotor being configured to rotate around the shaft, wherein the method involves at least one first permanent magnet unit and at least one second permanent magnet unit to be installed, said first permanent magnet unit comprising at least one first permanent magnet enclosed in a non-magnetic first enclosure, wherein the enclosed first permanent magnet is magnetized, wherein the first enclosure has means for connecting the first enclosure to at least one substantially similar second enclosure of the second permanent magnet unit containing at least one second permanent magnet enclosed in the second enclosure, and wherein in said method, the first permanent magnet unit is installed from the rotor end into an installation channel parallel to the rotor axis and the second permanent magnet unit is installed into the installation channel after the first permanent magnet unit in the direction of the rotor axis, and the second permanent magnet unit is pushed against the first permanent magnet unit and the permanent magnet units engage with each other using the brackets on the first and second enclosures.
A rotor for an electrical machine, said rotor being excited with a permanent magnet, said rotor rotating around its rotation axis and comprises at least a frame and permanent magnets, wherein at least one first permanent magnet is enclosed in a non-magnetic first enclosure of a first permanent magnet unit, and the enclosed first permanent magnet is magnetized, wherein the first enclosure has means for connecting the first enclosure to at least one substantially similar second enclosure of a second permanent magnet unit containing a second permanent magnet enclosed in the second enclosure, said first and second enclosed permanent magnets constituting a permanent magnet unit, wherein the first and second permanent magnet units are placed inside an installation channel formed inside the rotor frame one after another in the direction of the rotor axis, and the permanent magnet units are connected to each other, and wherein there are supports at the ends of the installation channel to prevent the permanent magnets from moving in the direction of the rotor axis.
Dependencies are inferred from the claim text.