Patent ID: 11894719
Assignee: FORD GLOBAL TECHNOLOGIES, LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. 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.