Rotating electrical machine and manufacturing method thereof

1. A rotating electrical machine, comprising:

a coil;

a rotor including

a shaft;

a rotor core including a plurality of teeth on which the coil is wound;

a commutator including a plurality of hooks being provided with a first hook to which an end of the coil is connected, the coil wound on a predetermined tooth of the plurality of teeth; and

an insulator attached to the rotor core; and

a stator arranged to face the rotor in a radial direction thereof; wherein

the insulator includes

an annular portion protruding opposite to the rotor core, the annular portion provided to surround the plurality of hooks which are aligned along a circumferential direction of the shaft; and

one or more protrusions protruding opposite to the rotor core relative to a distal end of the annular portion, the distal end arranged opposite to the rotor core;

a first protrusion of the one or more protrusions is arranged on a path where an end part of the coil passes through, the end part corresponding to an area from a part connected to the predetermined tooth to the end of the coil connected to the first hook, the protrusion being hooked by the end part;

the plurality of hooks further includes a second hook which is other than the first hook, the second hook to which the end of the coil wound on the predetermined tooth is not connected;

the first protrusion of the one or more protrusions is arranged at a same circumferential position as the first hook; and

none of the one or more protrusions is arranged at a same circumferential position as the second hook.

2. The rotating electrical machine according to claim 1 , wherein the protrusion is formed in a trapezoidal rib shape decreasing in width in a circumferential direction toward a protruding end thereof.

3. The rotating electrical machine according to claim 2 , wherein the rib-shaped protrusion is provided to protrude opposite to the rotor core from between a base portion of an outer circumferential surface and the distal end of the annular portion.

4. The rotating electrical machine according to claim 2 , wherein the protrusion includes a distal end surface in a protruding direction thereof and opposing end surfaces in the circumferential direction thereof, the distal end surface and the opposing end surfaces formed in a round shape along a radial direction of the protrusion.

5. The rotating electrical machine according to claim 2 , wherein the protrusion includes a plurality of protrusions arranged point-symmetrically with respect to a center point of the shaft.

6. The rotating electrical machine according to claim 1 , wherein the end of the coil is connected to a part of the first hook, the part arranged at a side where the rotor core is provided in an extending direction of the shaft relative to a position where a protruding end of the protrusion is arranged.

7. A manufacturing method of a rotating electrical machine including processes of;

press-fitting a shaft fixed with a commutator which includes a plurality of hooks into a rotor core including a plurality of teeth up to a predetermined position in a state where the rotor core is attached with an insulator including an annular portion which is arranged to surround the plurality of hooks and one or more protrusions protruding opposite to the rotor core relative to a distal end of the annular portion;

winding the coil to the predetermined tooth of the plurality of teeth and connecting an end of the coil to a predetermined hook of the plurality of hooks after the press-fitting process of the shaft fixed with the commutator up to the predetermined position; and

re-press fitting the shaft fixed with the commutator into the rotor core and hooking an end part of the coil, the end part corresponding to an area from a part connected to the predetermined tooth to the end of the coil connected to the predetermined hook, to a first protrusion of the one or more protrusions of the insulator arranged on a path of the end part of the coil after the end of the coil is connected to the predetermined hook; wherein

the plurality of hooks further includes a second hook which is other than the first hook, the second hook to which the end of the coil wound on the predetermined tooth is not connected;

the first protrusion of the one or more protrusions is arranged at a same circumferential position as the first hook; and

none of the one or more protrusions is arranged at a same circumferential position as the second hook.