Electrical insulator with projections in inner walls around stator core teeth for motor

An electrical insulator configured to be fitted onto a radially extending tooth of a stator core, the tooth having a first outer wall surface axially spaced from a second outer wall surface, and a third outer wall surface circumferentially spaced from a fourth outer wall surface,

• the electrical insulator including a tooth insertion hole in which the tooth is configured to be received, the electrical insulator being configured to be mounted on the tooth and restrained from moving relative to the tooth,
• the electrical insulator including an inner wall defining the tooth insertion hole and at least two projections that protrude from the inner wall into the tooth insertion hole,
• the inner wall including a first inner wall surface configured to face the first outer wall surface of the tooth, a second inner wall surface configured to face the second outer wall surface of the tooth, a third inner wall surface configured to face the third outer wall surface of the tooth and a fourth inner wall surface configured to face the fourth inner wall surface of the tooth in a state in which the tooth is in the tooth insertion hole, and
• the inner wall including at least one set of projections selected from a group consisting of a first set of projections located on the first inner wall surface and the second inner wall surface and a second set of projections located on the third inner wall surface and the fourth inner wall surface, the first set of projections including at least one first projection formed on the first inner wall surface and at least one second projection formed on the second inner wall surface, and the second set of projections including at least one third projection formed on the third inner wall surface and at least one fourth projection formed on the fourth inner wall surface,
• wherein the electrical insulator is configured to be restrained from moving relative to the tooth by abutment between the first and second outer wall surfaces of the tooth and the projections of the first set of projections and/or by abutment between the third and fourth outer wall surfaces of the tooth and the projections of the second set of projections, and
• wherein the projections include the first of projections.

An electrical insulator configured to be fitted onto a radially extending tooth of a stator core, the tooth having a first outer wall surface axially spaced from a second outer wall surface, and a third outer wall surface circumferentially spaced from a fourth outer wall surface,

• the electrical insulator including a tooth insertion hole in which the tooth is configured to be received, the electrical insulator being configured to be mounted on the tooth and restrained from moving relative to the tooth,
• the electrical insulator including an inner wall defining the tooth insertion hole and at least two projections that protrude from the inner wall into the tooth insertion hole,
• the inner wall including a first inner wall surface configured to face the first outer wall surface of the tooth, a second inner wall surface configured to face the second outer wall surface of the tooth, a third inner wall surface configured to face the third outer wall surface of the tooth and a fourth inner wall surface configured to face the fourth inner wall surface of the tooth in a state in which the tooth is in the tooth insertion hole, and
• the inner wall including at least one set of projections selected from a group consisting of a first set of projections located on the first inner wall surface and the second inner wall surface and a second set of projections located on the third inner wall surface and the fourth inner wall surface, the first set of projections including at least one first projection formed on the first inner wall surface and at least one second projection formed on the second inner wall surface, and the second set of projections including at least one third projection formed on the third inner wall surface and at least one fourth projection formed on the fourth inner wall surface,
• wherein the electrical insulator is configured to be restrained from moving relative to the tooth by abutment between the first and second outer wall surfaces of the tooth and the projections of the first set of projections and/or by abutment between the third and fourth outer wall surfaces of the tooth and the projections of the second set of projections, and
• wherein the at least one third projection and the at least one fourth projection extend in the radial direction or the axial direction, and the at least one first projection and the at least one second projection extend in the radial direction or the circumferential direction.