Rotor for small-sized motor and method of manufacturing same
First Claim
1. A rotor for a small-sized motor, comprising:
- a plurality of rotor magnetic poles;
a commutator; and
a rotor shaft, said rotor magnetic poles and said commutator being mounted on said rotor shaft, both ends of a wire of each winding of said rotor magnetic poles being tied up with and connected by welding to a commutator leg which is connected to a corresponding commutator piece end of the commutator, wherein said commutator leg has a copper-based base material and a thin layer of a clad material with a lower melting point and higher electric resistance than that of said base material, and said clad material is attached to said base material at least at a portion of the surface part with which the wire of said winding comes into contact for welding.
1 Assignment
0 Petitions
Accused Products
Abstract
A rotor for a small-sized motor has a plurality of rotor magnetic poles and a commutator on a rotor shaft, and both ends of a wire of each winding of the rotor magnetic poles are tied up with and connected by spot welding to a U-shaped hook-type commutator leg connected to the corresponding commutator piece end of the commutator, respectively. The commutator leg has a copper-based base material, and is composed by attaching a thin layer of a clad material with a melting point lower than that of the above described base material and a high electric resistance thereon at the surface part to be inside when bent to the U-shaped hook type. Thus, in the connection between the commutator leg and the copper wire material of the small-sized motor, the reduction of defectives of breaking of the wire because of heat shock at the time of welding is achieved, and in the meantime, the stabilization of welding is achieved, so that the reliability of the connection can be increased.
-
Citations
16 Claims
-
1. A rotor for a small-sized motor, comprising:
-
a plurality of rotor magnetic poles;
a commutator; and
a rotor shaft, said rotor magnetic poles and said commutator being mounted on said rotor shaft, both ends of a wire of each winding of said rotor magnetic poles being tied up with and connected by welding to a commutator leg which is connected to a corresponding commutator piece end of the commutator, wherein said commutator leg has a copper-based base material and a thin layer of a clad material with a lower melting point and higher electric resistance than that of said base material, and said clad material is attached to said base material at least at a portion of the surface part with which the wire of said winding comes into contact for welding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of manufacturing a rotor for a small-sized motor having a plurality of rotor magnetic poles and a commutator on a rotor shaft, both ends of a wire of each winding of said rotor magnetic poles tying up with commutator legs which are connected to the corresponding commutator piece end of the commutator, respectively and said both ends of a wire being heated by welding to be connected, the said method comprising the steps of:
-
preparing a copper-based base material;
attaching a clad material with a lower melting point and higher electric resistance than that of said base material and a high electric resistance to said base material at least at a portion of the surface part with which the wire of said winding comes into contact for welding; and
forming said commutator leg by the base material to which the clad material is attached. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
Specification