JPH02229405A - Coil bobbin - Google Patents

Abstract

PURPOSE:To enhance a space factor by a method wherein a protrusion which can be bent is formed at an outer circumference part on one side of ring-shaped winding frames of a ring-shaped coil bobbin provided with the ring-shaped winding frames on both ends. CONSTITUTION:Protrusions 2a, 11a which can be bent are formed at outer circumference parts on one side each of winding frames of a coil bobbin 2. After a winding operation has been finished, the protrusions 2a, 11a are bent and a coil is pressed down; insulation between a motor frame 10 and a coil wire can be secured; since one part each of the winding frames of the coil bobbin 2 becomes an insulator between the motor frame 10 and the coil wire, an insulating spatial distance at an extraction part of the coil wire is not required; accordingly, a space factor can be enhanced. As a result, a high efficiency of a motor can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a coil bobbin for a small motor having an excitation coil.

Conventional technology In order to simplify the winding process, automate it, and improve reliability, the excitation coil section of a small motor has both ends of a coil wire wound around a coil bobbin connected to connection terminals attached to the winding frame of the coil bobbin. It has a structure in which it is connected to an external circuit through a connection terminal.

The coil section of a conventional small motor will be described below with reference to the drawings.

FIG. 4 shows a conventional coil section, where 14 is a ring-shaped coil bobbin, 12 is a coil wire, and 13 is a connection terminal for fixing the coil wire and connecting it to an external circuit.

Problems to be Solved by the Invention However, in such a conventional structure, as the diameter of the coil bobbin winding frame is reduced in order to downsize the motor, the angle at which the wire is drawn out from the coil section to the connection terminal becomes smaller. Therefore, unless the space factor is reduced, the lead wire will come out of the winding frame of the coil bobbin, resulting in a loss of insulation space between the coil bobbin and the motor frame.

SUMMARY OF THE INVENTION An object of the present invention is to provide a coil bobbin that can improve the space factor in a small motor.

Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention forms a bendable protrusion on one outer periphery of the winding frame of a coil bobbin.

Effects According to the above configuration, it is possible to press down the coil by bending the protrusion after winding is completed, and to ensure insulation between the motor frame and the coil wire, so that a part of the winding frame of the coil bobbin can be bent between the motor frame and the coil wire. Since the insulator is an insulator, there is no need for an insulating space in the lead-out part of the coil wire, and the space factor can be improved, making it possible to improve the efficiency of the motor, and the presence of the insulator also improves the reliability of the motor.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a structural diagram of a stepping motor in an embodiment of the present invention. In FIG. 1, 1 is an outer yoke, 2 is a coil bobbin according to the present invention, on which a coil 4 is wound, 3 is an inner yoke, 8 is a motor rotor, 9 is a flange, and 10 is a frame.

The structure of the outer yoke 1 and the inner yoke 3 is such that yoke pieces 1a and 3a made of disk-shaped magnetic material are raised so as to be parallel to the rotor axis 7.

The structure of the coil bobbin 2 is such that after winding a coil wire on the coil bobbin of the present invention, the protrusion 2a is bent 90' inward at the part where the coil wire at the end of the coil winding is pulled out to be connected to the connection terminal. covered,
Ensures insulation between the coil and frame when assembling the motor.

The effects of the stepping motor of this embodiment configured as described above will be described below.

First, since it is possible to increase the space factor, efficiency and output can be improved, and the outer diameter of a motor with the same characteristics as a conventional motor can be reduced, making it possible to reduce the size and weight. In particular, this effect becomes thicker as the motor becomes smaller.

In addition, reliability is improved because the coil wire and frame can be reliably insulated.

Effects of the Invention As is clear from the above description, the present invention provides insulation between the motor frame and the coil wire by the bendable protrusion provided on one end surface of the ring-shaped coil bobbin, thereby improving reliability. An excellent effect of improving the space factor of the coil can be obtained.

Furthermore, this effect allows the motor to be made more efficient and more compact.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a PM stepping motor using a coil bobbin according to an embodiment of the present invention, FIG. 2 is a perspective view of the coil bobbin of the present invention, and FIG. 3 is a side view of the coil bobbin according to the present invention. FIG. 4 is a side view of a conventional coil bobbin. Name of York agent in case 111 Patent attorney Shigetaka Awano and one other person Figure q

Claims (1)

[Claims] A coil bobbin in which a bendable protrusion is formed on the outer periphery of one of the winding frames of a ring-shaped coil bobbin that has a ring-shaped winding frame at both ends of a coil winding core.