Stator having winding wires with differing wire coating thickness

A stator comprising:

• a stator core;
• and
• a coil,
• wherein a connection state of the coil is switched,
• the stator core includes a plurality of slots and a plurality of tooth portions that are annularly aligned in an alternating manner,
• the coil includes winding wires of a plurality of phases, including at least a first winding wire and a second winding wire that are wound around the tooth portions, connection states of the first winding wire and the second winding wire being switched,
• the first winding wire includes a plurality of first insertion portions that passes through a slot,
• the second winding wire includes a plurality of second insertion portions that passes through the slot through which the first insertion portion passes,
• both the plurality of first insertion portions and the plurality of second insertion portions are disposed in the same slot,
• each of the plurality of first insertion portions include a first core wire and a first coating portion that covers the first core wire,
• each of the plurality of second insertion portions include a second core wire and a second coating portion that covers the second core wire, and
• a thickness of the second coating portion is smaller than a thickness of the first coating portion and wherein the plurality of first insertion portions and the plurality of second insertion portions are alternatingly aligned in a radial direction in the slot.