Slotless electric motor having improved cooling
AssigneeHinetics LLC
InventorsNoah Salk, Thanatheepan Balachandran, Kiruba Haran, Dongsu Lee, Paige Powell
Life of this patent
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Abstract
A slotless electric motor provides a ferromagnetic yoke that includes laminations of a ferromagnetic material interspersed with a high thermal conductivity nonferromagnetic material to greatly reduce the thermal resistance of this yoke. A thermally conductive coil form provides heat conduction paths on three sides of the coils to this yoke which may in turn attach to a heatsink providing fins that vary angularly along the axis and radius of the heatsink.
Claims19
An electric machine comprising:
- a rotor mounted for rotation about an axis;
- a stator positioned adjacent to the rotor and providing a stator body having a circumferential periphery supporting a series of electrically independent coils spaced therealong, the coils providing a first face facing the rotor and a second face supported by the stator body;
- and
- wherein the stator body provides a set of radially extending, laminated, electrically separate interspersed layers of ferrous material and nonferrous material, wherein the nonferrous material provides a higher thermal conductivity than the ferrous material.
An electric machine comprising:
- a rotor mounted for rotation about an axis;
- a stator positioned adjacent to the rotor and providing a stator body having a circumferential periphery supporting a series of electrically independent coils spaced therealong, the coils providing a first face facing the rotor and a second face supported by the stator body;
- and
- wherein the stator body further includes a nonferromagnetic coil carrier providing a set of axially extending slots segregating conductors of electrically independent coils.
An electric machine comprising:
- a rotor mounted for rotation about an axis;
- a stator positioned adjacent to the rotor and providing a stator body having a circumferential periphery supporting a series of electrically independent coils spaced therealong, the coils providing a first face facing the rotor and a second face supported by the stator body;
- and
- further including a heatsink having fins adapted to transfer heat to passing air and positioned in thermal communication with the stator body opposite to a side of the stator body supporting the coils;
- wherein the heatsink provides a set of radially extending fins varying in angular position about the axis as a function of at least one of distance along the axis and distance away from the axis.
An electric machine comprising:
- a rotor mounted for rotation about an axis;
- a stator positioned adjacent to the rotor and providing a stator body having a circumferential periphery supporting a series of electrically independent coils spaced therealong, the coils providing a first face facing the rotor and a second face supported by the stator body;
- and
- wherein the stator body provides a set of radially extending, laminated, electrically separate layers of ferrous material and further includes a coil carrier providing a set of axially extending slots segregating conductors of electrically independent coils wherein the coil carrier is an electrically insulating material having a thermal conductivity of greater than 50 W/mK and contacting a bottom side and left and right sides of each coil.
Dependencies are inferred from the claim text.