Winding method of electric motor, electric motor and seatbelt device provided therewith
View Patent ↗An electric motor 1 includes a rotor core 22 having n pieces of teeth T arranged in the circumferential direction around which a coil wire 23 is wound, a commutator 24 having n pieces of segments 24 a 24 b , and 24 c , and the coil wire 23 having a connecting wire portion 23 a that connects the teeth T and the segments 24 a, 24 b , and 24 c and a crossover portion 23 b that interconnects the segments 24 a, 24 b , and 24 c at the opposite pole positions of the commutator 24 around a shaft 23 . The crossover portion 23 b that connects the i-th (i=1 to n) and the (i+n/2)th of the segments 24 a, 24 b , and 24 c is wound prior to the connecting wire portion 23 b that connects the teeth T connected with the i-th segment 24 a, 24 b, 24 c and the (i+1)th segment 24 a, 24 b, 24 c , respectively.
1. A winding method of an electric motor, comprising:
assembling a frame having a magnet on an inner circumference, a shaft rotatably supported by said frame, a rotor core fixed to said shaft, one coil wire wound around said rotor core, and a commutator fixed to said shaft and connected to said coil wire,
wherein said rotor core has n pieces of teeth arranged in a circumferential direction around which said coil wire is wound,
wherein said commutator has n pieces of segments,
wherein said coil wire has a connecting wire portion that connects said teeth and said segments and a crossover portion that interconnects said segments at opposite pole positions of said commutator around said shaft,
wherein said crossover portion that connects an i-th segment of said segments and an (i+n/2)th segment of said segments is wound prior to said connecting wire portion that connects the teeth connected with the i-th segment and the (i+1)th segment, respectively, and
wherein i ranges from 1 to n.
2. An electric motor comprising:
a frame having a magnet on an inner circumference;
a shaft rotatably supported by said frame;
a rotor core fixed to said shaft;
one coil wire wound around said rotor core; and
a commutator fixed to said shaft and connected to said coil wire,
wherein said rotor core has a plurality of teeth arranged in a circumferential direction around which said coil wire is wound;
wherein said commutator has segments in a same number as that of said plurality of teeth;
wherein said coil wire has a connecting wire portion that connects said teeth and said segments and a crossover portion that interconnects said segments at opposite pole positions of said commutator around said shaft; and
wherein said crossover portion is arranged inside said connecting wire portion.
3. A seatbelt device comprising:
at least a seatbelt that constrains an occupant in an emergency,
a seatbelt retractor that retracts the seatbelt, the seatbelt retractor having the electric motor of claim 2 ,
a guide anchor for the seatbelt that guides said seatbelt withdrawn from the seatbelt retractor toward a shoulder of the occupant,
a tongue plate slidably supported by said seatbelt guided from the guide anchor for the seatbelt, and
a buckle in which said tongue plate is detachably inserted and engaged,
wherein said seatbelt is retractable by said seatbelt retractor.
4. An electric motor, comprising:
a frame having a magnet on an inner circumference;
a shaft rotatably supported by said frame;
a rotor core fixed to said shaft;
one coil wire wound around said rotor core; and
a commutator fixed to said shaft and connected to said coil wire,
wherein said rotor core has n pieces of teeth arranged in a circumferential direction around which said coil wire is wound,
wherein said commutator has n pieces of segments,
wherein said coil wire has a connecting wire portion that connects said teeth and said segments and a crossover portion that interconnects said segments at opposite pole positions of said commutator around said shaft,
wherein said crossover portion that connects an i-th segment of said segments and an (i+n/2)th segment of said segments is wound prior to said connecting wire portion that connects the teeth connected with the i-th segment and the (i+1)th segment, respectively, and
wherein i ranges from 1 to n.