Patent ID: 11870299
Assignee: PERSIMMON TECHNOLOGIES CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A motor assembly, comprising:
a composite housing having,
a shell,
a core of sprayed magnetic particles bonded to an inner-facing surface of the shell and forming a stator,
a recess in the inner-facing surface of the shell, the recess defining a cavity in the inner-facing surface, and
a winding on the core; and

a rotor having a magnet located thereon, the rotor being rotatably mounted within the winding and having an output shaft;
wherein a surface of the cavity defined by the recess extends longitudinally along a length of the shell and continuously around a cross section of the shell and is equidistant in radial directions from the output shaft;
wherein the core of sprayed magnetic particles comprises particles of an iron-containing material built up by a continuous deposition of the particles, each particle having an aluminum oxide coating thereon such that when deposited a plurality of the particles forms an aggregate of small micro-domains, each of the aggregates separated by oxide insulation boundaries, the iron-containing material providing a magnetic path that limits losses associated with the formation of eddy currents in the core, and the oxide insulation boundaries limiting electrical conductivity; and
wherein the iron-containing material comprises an iron-aluminum alloy comprising about 89 wt. % iron, about 10 wt. % aluminum, and about 0.25 wt. % carbon; and
wherein the oxide insulation boundaries are aluminum oxide.