Terminal structure of a motor

• US 6,455,962 B2
• Filed: 03/13/2001
• Issued: 09/24/2002
• Est. Priority Date: 03/30/2000
• Status: Active Grant

• Current Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Original Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Inventors: Suzuki, Yuzuru, Harada, Naoyuki, Matsushita, Kunitake, Ohyashiki, Taketoshi, Fujitani, Sakae, Shibata, Hiroichi, Nakamata, Hirohito
• Primary Examiner(s): Nguyen, Tran
• Assistant Examiner(s): LE, DANG D
• Application Number:
  US09/803,909
• Publication Number:
  US 20010026103A1
• Time in Patent Office: 560 Days
• Field of Search: 370/71, 370/49.R, 370/208, 370/194, 370/164, 336/192, 336/198, 439/884, 439/874, 439/875
• US Class Current: 310/71
• CPC Class Codes: H02K 15/0056 Manufacturing winding connections
• CPC Class Codes: H02K 15/0068 Connecting winding sections; Forming leads; Connecting leads to terminals
• CPC Class Codes: H02K 3/525 Annular coils, e.g. for cores of the claw-pole type
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

A terminal of a motor is provided, in which a connection between a coil and an external circuit can be carried out securely and with a good workability, while saving material resources and enhancing safety relating to environmental pollution. A terminal (23) consists integrally of a magnet wire binding section (20) to connect to a magnet wire (4) of a coil (6), an external connection section (21) to connect to an external circuit and a support base section (22) to press-fit into a terminal block (19) of a bobbin (5) and hold the terminal (23), and the magnet wire (4) is plasma welded for connection through to the external connection section (21) (terminal 23). The connection of the terminal is carried out by welding (plasma welding), thus the end of the magnet wire of a motor (1) is connected without using solder containing lead. As a result, since lead is not used, material resources can be saved and safety relating to the environmental pollution can be enhanced. Since the support base section (22) press-fits into a hole of the terminal block (19) of the bobbin (5), a direction and position of the terminal (23) are settled to thereby increase the stability.

Claims

1. A terminal structure of a motor,

said motor comprising:

a stator in which a coil, which is formed by winding a magnet wire around a bobbin made of an insulating material, is inserted in a stator yoke made of a soft magnetic material; and

a rotor which includes a permanent magnet, which is rotatably arranged in an inner circumference of said stator, said terminal structure characterized in that;

said bobbin includes a terminal for connecting said coil and an external circuit;

said terminal consists integrally of;

a magnet wire binding section to connect to the magnet wire of said coil;

an external connection section to connect to said external circuit; and

a support base section to press-fit into a terminal block of said bobbin and hold said terminal;

said magnet wire binding section is formed in a substantially L-shape with a first wing thereof joining with a junction of said support base section and said external connection section in such a manner that said first wing thereof is perpendicular to said support base section and that a second wing thereof is parallel with said external connection section with a prescribed distance therebetween; and

a length of said second wing of said magnet wire binding section is set different from a length of said external connection section.

2. The terminal structure of claim 1, wherein a junction of said support base section, said external connection section and said first wing of said magnet wire binding section, as well as said support base section, press-fits into said terminal block of said bobbin.

3. The terminal structure of claim 1, wherein an end of the magnet wire of said coil is bound around said second wing of said magnet wire binding section;

and a length of said second wing of said magnet wire binding section is set so that a distance from an end of the binding of the magnet wire to a tip end of said second wing of said magnet wire binding section falls within a range of 0.5 to 3 mm.

4. The terminal structure of claim 1, wherein at least one of a projection and a recess for preventing said terminal from pulling out from said terminal block of said bobbin is formed at said support base section.

5. The terminal structure of claim 1, wherein a length of said external connection section is larger than a length of said magnet wire binding section.

6. The terminal structure of claim 1, wherein the connection of said magnet wire binding section and the magnet wire of said coil is carried out by means of plasma welding.

7. The terminal structure of claim 1, wherein the connection of said magnet wire binding section and the magnet wire of said coil is carried out by means of resistance welding.

8. A terminal structure of claim 1, wherein a lead terminal to connect said external connection section and said external circuit is connected to said external connection section by means of resistance welding.

9. The terminal structure of claim 1, wherein a substantially C-shaped cutout into which said lead terminal fits is provided at a tip end of said external connection section.

10. The terminal structure of claim 1, wherein said lead terminal widens at an end joining with said external connection section, and a substantially C-shaped cutout into which said external connection section fits is provided at the center of the end.