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US 11,894,719 B2Granted
Permanent magnet of multiple pieces having different easy axes
AssigneeFord Global Technologies, LLC
InventorChuanbing Rong
Life of this patent
Estimating the term…
Abstract
A rotor of an electric machine includes a rotor core defining a magnet channel extending axially between opposing ends of the rotor core. A permanent magnet is disposed in the channel and has opposing ends and opposing major sides. The magnet includes a central piece of anisotropic magnetic material having a first magnetically easy crystallographic axis, and a corner piece of anisotropic magnetic material joined to the central piece and having a second magnetically easy crystallographic axis that is oblique to the first easy axis.
Claims17
A rotor of an electric machine comprising:
- a rotor core defining a magnet channel extending axially between opposing ends of the rotor core;
- a permanent magnet disposed in the channel and having opposing ends and opposing major sides, the magnet including:
- a central piece of anisotropic magnetic material having a first magnetically easy crystallographic axis, and
- a corner piece of anisotropic magnetic material joined to the central piece and having a second magnetically easy crystallographic axis that is oblique to the first easy axis;
- and
- a second corner piece of anisotropic magnetic material joined to the central piece and having a third magnetically easy crystallographic axis that is oblique to the first easy axis;
- wherein the central piece further has opposing front and back surfaces and a side surface extending therebetween, wherein the corner piece and the second corner piece are joined to the side and are joined to each other.
4 more elements
A rotor of an electric machine comprising:
- a rotor core defining a magnet channel extending axially between opposing ends of the rotor core;
- and
- a prismatic permanent magnet disposed in the channel and having opposing first and second ends, opposing front and back faces extending axially between the opposing ends, and opposing first and second sides extending axially between the opposing ends and extending laterally between the opposing faces, the magnet being formed of multiple pieces and including:
- a central piece of magnetic material having a front surface that forms a portion of the front face, a back surface that forms a portion of the back face, and a side surface extending between the front and back surfaces, wherein the central piece has a first magnetically easy crystallographic axis that is substantially normal to the faces,
- a front corner piece joined to the side surface and having a front surface that forms a portion of the front face, a side surface that forms a portion the first side, and an end surface that forms a portion of the first end, wherein the front corner piece has a second magnetically easy crystallographic axis that is oblique to the first easy axis, and
- a back corner piece joined to the side surface of the central piece and to a back surface of the front corner piece, the back corner piece having a back surface that forms a portion of the back face, a side surface that forms a portion of the first side, and an end surface that forms a portion of the first end, wherein the back corner piece has a third magnetically easy crystallographic axis that is oblique to the first and second easy axes.
3 more elements
A multiple-piece permanent magnet of an electric machine comprising:
- a prismatic body having opposing first and second ends, opposing front and back faces extending axially between the opposing ends, and opposing first and second sides extending axially between the opposing ends and extending laterally between the opposing faces, the body being formed of multiple pieces and including:
- a central piece of magnetic material having a front surface that forms a portion of the front face, a back surface that forms a portion of the back face, and a side surface extending between the front and back surfaces, wherein the central piece has a first magnetically easy crystallographic axis that is substantially normal to the faces, and
- a first corner piece joined to the side surface and having a front surface that forms a portion of the front face, a side surface that forms a portion the first side, and an end surface that forms a portion of the first end, wherein the front corner piece has a second magnetically easy crystallographic axis that is oblique to the first easy axis, wherein the body further includes a second corner piece joined to the side surface of the central piece and to a back surface of the first corner piece, the second corner piece having a back surface that forms a portion of the back face, a side surface that forms a portion of the first side, and an end surface that forms a portion of the first end, wherein the second corner piece has a third magnetically easy crystallographic axis that is oblique to the first easy axis.
Dependencies are inferred from the claim text.