Method of fusing commutator risers to armature coil in electric motor

• US 5,447,268 A
• Filed: 08/25/1994
• Issued: 09/05/1995
• Est. Priority Date: 10/08/1992
• Status: Expired due to Fees

• Current Assignee: Mitsuba Corporation
• Original Assignee: Mitsuba Electric Manufacturing Company Limited (Mitsuba Corporation)
• Inventors: Hoshino, Yutaka, Fukui, Masashi, Shimura, Atsushi, Sakamoto, Takayoshi
• Primary Examiner(s): Heinrich, Samuel M.
• Application Number:
  US08/244,535
• Time in Patent Office: 376 Days
• Field of Search: 228/179.1, 228/180.1, 228/212, 228/6.2, 228/44.7, 29/597, 29/598, 29/733, 219/56.1
• US Class Current: 228/179.1
• CPC Class Codes: H01R 39/32 Connections of conductor to commutator segment
• CPC Class Codes: H02K 13/04 Connections between commutator segments and windings
• CPC Class Codes: Y10T 29/49011 Commutator or slip ring assembly

Abstract

A method which permits easy fusion of commutator risers to armature coils of an electric motor. When there are 20 risers, for example, 10 through-holes are formed in the boss portion of the armature core of the motor, each through-hole being so sized that the back surfaces of two adjacent risers are exposed through each through-hole. Sub-electrodes are inserted into the through-holes such that each sub-electrode supports the back side of the two risers exposed through the through-hole which receives this sub-electrode. First and second main electrodes are so arranged that the first electrode contacts with the first riser of the first riser group exposed through the first through-hole while the second main electrode contacts the second riser of the sixth riser group exposed through the sixth through-hole. After conducting fusing on these risers, the main electrodes are shifted into contact with the risers which are the second as counted from the risers which have just been fused, and fusion is conducted on these risers. This operation is repeated until all the risers are fused.

Claims

1. A method of fusing risers projecting from a commutator of an electric motor to armature coils of said motor, comprising the steps of:

setting a number A of said risers to a value which has at least one whole number submultiple greater than one;

forming a plurality of through-holes in a boss of an armature core of said motor, the number of said through holes being equal to a number M obtained through division of the number A of said risers by one of said submultiples, each of said plurality of through-holes being so sized that M number of said risers forming respective groups of risers are axially exposed through said through-holes and are in contact with the armature coils of said motor;

inserting riser support members into each of said through-holes, each of said riser support members being sized so as to simultaneously contact all the risers exposed through each of said through-holes;

arranging a number N of main electrodes, such that each of said main electrodes is associated with one of the through-holes and each of the main electrodes is in contact with one of said risers which is on a different order of said risers in each of the respective groups of risers;

effecting fusing of the risers contacted by said main electrodes to the armature coils;

shifting each of said main electrodes into contact with the risers which are an N-th number of risers away from the risers which have just been fused; and

repeating the fusion and shifting steps sequentially until all the risers are fused.

2. A method of fusing risers projecting from a commutator of an electric motor to armature coils of said motor, comprising the steps of:

setting a number A of said risers to an even number which has "2" as a submultiple;

forming a plurality of through-holes in a boss of an armature core of said motor, the number of said through holes being equal to A/2, each of said plurality of through-holes sized so that two of said risers forming groups of risers are axially exposed simultaneously through each of said plurality of through-holes;

inserting riser support members into each of said through-holes, each of said riser support members being sized so as to simultaneously contact all the risers exposed through each of said through-holes;

arranging first and second main electrodes such that the first and second main electrodes are associated with two of said groups of risers which are symmetrical with each other with respect to an axis of the motor such that the first main electrode contacts with a first one of the two risers in a first one of said two groups of risers while the second main electrode contacts a second one of the two risers in a second one of said two groups of the risers;

effecting fusion of said risers contacted by said first and second main electrodes;

shifting each of said main electrodes into contact with risers which are a second number of risers as counted from the risers which have just been fused by the first and second main electrodes; and

repeating the fusion and shifting steps until all the risers are fused.

3. A method of fusing risers projecting from a commutator of an electric motor to armature coils of said motor, comprising the steps of:

setting a number A of said risers to a value which which has "3" as a submultiple;

forming a plurality of through-holes in a boss of an armature core of said motor, the number of said through holes being equal to A/3, each of said plurality of through-holes sized so that three of said risers forming groups of said risers are axially exposed simultaneously through each of said through-holes;

inserting riser support members into each of said through-holes, each of said riser support members being sized so as to simultaneously contact all the risers exposed through each of said through-holes;

arranging first to third main electrodes such that the first to third main electrodes are associated with three different ones of said groups of risers such that the first, second and third main electrodes respectively contact with a first, a second and a third riser of the respective groups of the risers;

effecting fusion on said risers contacted by each of said main electrodes;

shifting each of said main electrodes into contact with risers which are a third number of risers as counted from the risers which have just been fused by each of the main electrodes; and

repeating the shifting and fusion until all the risers are fused.