Electric machine with cooling channel loops for stator magnetic poles

A motor vehicle comprising:

• an axial flux electric motor configured to generate torque for propulsion of the motor vehicle, the axial flux electric motor including:
• a rotationally fixed stator defining a rotational axis and having a plurality of conductive stator magnetic poles arranged radially about the rotational axis;
• and
• at least one rotor spaced axially from one side of the stator, rotatably mounted coaxially with the rotational axis, each having a plurality of permanent magnets (PMs) arranged symmetrically around the rotational axis and facing the stator;
• wherein:
• a torque is generated on the at least one rotor by a rotating magnetic field established via interaction between the corresponding PMs and the magnetic poles when an electrical current is passed through the magnetic poles;
• and
• the stator additionally includes a plurality of cooling channel loops, together surrounding each of the stator magnetic poles, and configured to receive and pass therethrough a fluid to remove thermal energy from the stator magnetic poles resulting from the electrical current.

An axial flux electric motor comprising:

• a rotationally fixed stator defining a rotational axis and having a plurality of conductive stator magnetic poles arranged radially about the rotational axis;
• and
• at least one rotor spaced axially from one side of the stator, rotatably mounted coaxially with the rotational axis, each having a plurality of permanent magnets (PMs) arranged symmetrically around the rotational axis and facing the stator;
• wherein:
• a torque is generated on the at least one rotor by a rotating magnetic field established via interaction between the corresponding PMs and the magnetic poles when an electrical current is passed through the magnetic poles;
• and
• the stator additionally includes a plurality of cooling channel loops, together surrounding each of the stator magnetic poles, and configured to receive and pass therethrough a fluid to remove thermal energy from the stator magnetic poles resulting from the electrical current;
• the plurality of cooling channel loops is arranged in a pattern of nested fluid conduits;
• the cooling channel loops overlap in a plan view and each cooling channel loop has a variable cross-sectional area to optimize fluid flow distribution proximate a respective stator magnetic pole;
• the cross-sectional area of each cooling channel loop is relatively smaller in a region of overlap with another cooling channel loop and is relatively greater in a region without overlap with another cooling channel loop;
• and
• each cooling channel loop extends partially around each stator magnetic pole, alternating between extending proximate a radially outer portion of one stator magnetic pole and a radially inner portion of a neighboring stator magnetic pole.