Insulator and brushless DC motor including the same
In an insulator to insulate teeth of a stator, which is a three-phase electric motor and which has nine teeth or more, and a conducting wire wound around the teeth, slits for parallel wire connection to be conducting wire extraction parts only in parallel wire connection, slits for serial wire connection to be conducting wire extraction parts only in serial wire connection, and shared slits to be conducting wire extraction parts in both of the serial wire connection and the parallel wire connection are provided.
1. An insulator that insulates teeth of a stator, which is a component of a three-phase electric motor and which includes nine teeth or more, and a conducting wire wound around the teeth, the insulator comprising:
an outer peripheral wall provided on a yoke of a stator core;
a slit per phase in the outer peripheral wall for parallel wire connection which slit becomes a conducting wire extraction part, wherein a conducting wire wound around the teeth of the stator of the electric motor is extracted only in parallel wire connection;
a slit per phase in the outer peripheral wall for serial wire connection which slit becomes a conducting wire extraction part only in serial wire connection; and
a shared slit per phase in the outer peripheral wall that becomes a conducting wire extraction part in both of the serial wire connection and the parallel wire connection.
2. The insulator according to claim 1 , wherein the slit for serial wire connection is provided in a position corresponding to the teeth that is not adjacent to a neutral point and a winding end of any power line in a case of the serial wire connection.
3. The insulator according to claim 2 , wherein the slit for serial wire connection is formed in a depth identical to a depth of the slit for parallel wire connection.
4. A brushless DC motor including the insulator according to claim 1 .