Electric machine stator with liquid cooled teeth

An electric machine comprising:

• a rotor having an axis of rotation;
• and
• a stator having an axis, the axis of the stator being the axis of rotation of the rotor, the stator being separated from the rotor by and air gap and having:
• a stator core having a plurality of layers, each of the layers having a back iron portion and a plurality of teeth,
• a tooth of the plurality of teeth of a first layer of the plurality of layers having a first aperture forming a first portion of a fluid channel,
• wherein the fluid channel includes:
• a first segment, the first segment being substantially parallel to the first layer, and the first segment comprising the first portion of the fluid channel;
• a second segment, the second segment being substantially parallel to a second layer of the plurality of layers;
• and
• a third segment, the third segment extending through a tip of a tooth of a third layer of the plurality of layers,
• wherein:
• the third layer is between the first layer and the second layer,
• the third segment connects the second segment and the first segment,
• a fourth layer of the plurality of layers is at one end of the stator core and has no aperture, in any tip of any tooth, that is in fluid communication with the fluid channel, and
• the fluid channel is not in fluid communication with the air gap.

An electric machine comprising:

• a rotor;
• a stator having a stator core having a plurality of layers, each of the layers having a back iron portion and a plurality of teeth;
• channel means for channeling a fluid through the teeth of the stator core;
• and
• pumping means for supplying the fluid to the channel means,
• a tooth of the plurality of teeth of a first layer of the plurality of layers having a first aperture forming a first portion of a fluid channel,
• wherein the fluid channel includes:
• a first segment, the first segment being substantially parallel to the first layer, and the first segment comprising the first portion of the fluid channel;
• a second segment, the second segment being substantially parallel to a second layer of the plurality of layers;
• and
• a third segment, the third segment extending through a tip of a tooth of a third layer of the plurality of layers,
• wherein:
• the third layer is between the first layer and the second layer,
• the third segment connects the second segment and the first segment,
• a fourth layer of the plurality of layers is at one end of the stator core and has no aperture, in any tip of any tooth, that is in fluid communication with the fluid channel,
• the stator is configured to interact with the rotor through an air gap, and
• the fluid channel is not in fluid communication with the air gap.