Insulator, stator, and electric motor

An insulator made of resin to be attached to a stator core, which comprises an annular core body and a plurality of teeth protruding from the core body along a radial direction, for providing insulation between the stator core and coils wound around the teeth, the insulator comprising:

• a first insulator and a second insulator to be attached from both axial sides of the stator core,
• wherein the first insulator comprises:
• a first core end surface covering portion covering a first end surface of the core body in an axial direction;
• and
• a first skirt portion extending in the axial direction from the first core end surface covering portion toward the second insulator and covering a peripheral surface of the core body and circumferential side surfaces of the teeth,
• wherein the second insulator comprises:
• a second core end surface covering portion covering a second end surface of the core body opposite to the first end surface in the axial direction;
• a second skirt portion extending in the axial direction from the second core end surface covering portion toward the first insulator and covering the peripheral surface of the core body and the circumferential side surfaces of the teeth, wherein the second skirt portion comprises a core side surface covering portion covering the peripheral surface of the core body;
• and
• a concave portion that is formed at a tip portion, opposite to the second core end surface covering portion, of the core side surface covering portion and is recessed toward the second core end surface covering portion with respect to the tip portion,
• wherein the insulator comprises a coil lead-out portion provided integrally only with the first core end surface covering portion for leading out terminal portions of the coils from the first insulator to outside, and
• a length of a longest portion of the second skirt portion in the axial direction is greater than a length of a longest portion of the first skirt portion in the axial direction.