Motor assembly with reduced thermal resistance

A motor assembly comprising:

• a stator having a circumferential interior surface;
• a plurality of stator teeth extending radially inward from the interior surface of the stator;
• a plurality of slots formed between pairs of adjacent stator teeth and the interior surface of the stator;
• and
• a plurality of slot liners, each slot liner of the plurality of slot liners disposed within one of the plurality of slots, wherein each slot liner includes:
• a body portion having an exterior side disposed against the interior surface and an interior side opposite the exterior side,
• a first arm portion disposed against a first stator tooth of the plurality of stator teeth,
• a second arm portion disposed against a second stator tooth of the plurality of stator teeth, the second stator tooth being adjacent to the first stator tooth, and
• one or more insulation openings formed in the body portion between the interior side and the exterior side so as to form a fluid connection between each respective slot of the plurality of slots and the interior surface of the stator.

A pump system for pumping a fluid, the pump system comprising:

• a pump housing including an inlet conduit configured to convey the fluid into the pump housing and an outlet conduit configured to convey the fluid out of the pump housing;
• an electric motor assembly including a stator;
• a shaft extending out of the stator and into the pump housing, the electric motor assembly being configured to rotate the shaft with respect to the electric motor and the pump housing;
• an impeller disposed on the shaft and within the pump housing in fluid communication with the inlet conduit and the outlet conduit, the impeller being configured to rotate within the pump housing in response to the shaft so as to convey the fluid out of the outlet conduit;
• wherein the stator includes:
• a plurality of stator teeth extending radially inward and spaced from one another to form a plurality of slots, and
• a plurality of slot liners each disposed within one of the plurality of slots, each of the plurality of slot liners including one or more insulation openings disposed so as to form a fluid connection between the respective slot and the stator;
• and
• a thermally conductive and electrically isolating potting material disposed within at least one of the plurality of slots so as to cover the one or more insulation openings.