Permanent Magnet Rotor With Intrusion
A rotor for an electric machine is provided that includes a magnet and a non-magnetic region located adjacent the magnet. The non-magnetic region has an intrusion extending into the non-magnetic region.
1 . A rotor for an electric machine, the rotor comprising:
a magnet;
a non-magnetic region located adjacent to the magnet; and
an intrusion extending into the non-magnetic region.
2 . The rotor of claim 1 wherein the non-magnetic region is an electrically non-conductive region.
3 . The rotor of claim 1 wherein the non-magnetic region is a hole in the rotor.
4 . The rotor of claim 1 wherein the non-magnetic region is filled with epoxy.
5 . The rotor of claim 1 wherein the intrusion is formed of a magnetic material.
6 . The rotor of claim 1 wherein the intrusion is formed of electrically conductive material.
7 . The rotor of claim 1 wherein the intrusion extends across the non-magnetic region in a radial direction.
8 . The rotor of claim 1 wherein the non-magnetic region has a first region adjacent to a first azimuthal side of the intrusion and a second region adjacent to a second azimuthal side of the intrusion.
9 . The rotor of claim 1 wherein the rotor is positioned relative to a stator to form an gap between an edge of the rotor and the stator, the intrusion extending radially from the edge of the rotor into the gap.
10 . The rotor of claim 1 further comprising a second non-magnetic region located radially between the magnet and an edge of the rotor.
11 . The rotor of claim 1 further comprising a magnetic region located between the non-magnetic region and the edge of the rotor.
12 . A rotor for an electric machine, the rotor having an edge configured to be located adjacent to an air gap that is adjacent to a stator, the rotor comprising:
a first magnet;
a second magnet;
a non-magnetic region located between a first end of the first magnet and a second end of the second magnet; and
an intrusion extending radially from the edge and into the non-magnetic region and into the air gap.
13 . The rotor of claim 12 wherein the non-magnetic region is an electrically non-conductive region.
14 . The rotor of claim 12 wherein the non-magnetic region is a hole in the rotor.
15 . The rotor of claim 12 , wherein the non-magnetic region is filled with epoxy.
16 . The rotor of claim 12 wherein the intrusion is formed of a magnetic material.
17 . The rotor of claim 12 wherein the intrusion is formed of an electrically conductive material.
18 . The rotor of claim 12 wherein the non-magnetic region has a first region adjacent to a first azimuthal side of the intrusion and a second region adjacent to a second azimuthal side of the intrusion.
19 . The rotor of claim 12 further comprising:
a second non-magnetic region located radially between the first magnet and an edge of the rotor; and
a third non-magnetic region located radially between the second magnet and the edge of the rotor.
20 . A rotor structure configured to increase reluctance torque, the rotor structure including an intrusion in a non-magnetic region that is located between two magnets.