JPH0441741Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a field coil used, for example, in a starter motor.

[Conventional technology]

In the conventional method, as shown in Japanese Utility Model Publication No. 36-23709, a field coil formed into a predetermined shape is covered with an upper cover and a lower case separately formed from an insulating material.

[Problem that the invention attempts to solve]

However, if the above-mentioned conventional type is used and the series-wound field coil and shunt-wound field coil are covered with an upper cover and a lower case, the heat generated in the series-wound field coil and shunt-wound field coil is transferred to the outside. There is a risk that the outer sheathing of the series and shunt field coils will melt due to the heat, resulting in a short circuit between the series and shunt field coils. When placing the shunt field coil on the inner circumference of the winding field coil and fitting the top cover and bottom case, it is necessary to position and fix the series winding field coil and shunt field coil, making assembly difficult. There is a problem with that.

[Means for solving problems]

a first flange, facing the first flange;
A second collar having an outer circumferential edge smaller than an outer circumferential edge of the first collar, and a cylindrical portion connecting an inner periphery of the first collar and an inner periphery of the second collar. a bobbin made of a flexible member; a shunt field coil wound around the outer periphery of the cylindrical portion of the bobbin, the outer periphery of which is disposed inside the outer periphery of the second collar; The inner peripheral width is smaller than the outer peripheral edge of the second collar portion of the bobbin, and the bobbin is disposed in a holding portion formed at the outer periphery of the shunt field coil and the opposing portion of the first and second collar portions. The present invention is to provide an electric motor equipped with a ring-shaped series-wound field coil and

[Effect]

By making the outer circumferential edge of the second brim portion smaller than the outer circumferential edge of the first brim portion, a portion where the field coil comes into contact with air is secured. Further, the series-wound field coil is held in a holding portion formed by the outer periphery of the shunt-wound field coil and the opposed portions of the first flange portion and the second flange portion. The flexible bobbin is elastically deformed so that the outer circumferential edge of the second brim becomes smaller than the inner circumferential width of the series-wound field coil, making it possible to attach the series-wound field coil to the bobbin holder. shall be.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a plan view showing a state in which a series-wound field coil 3 shown in FIG. 4 is wound around a bobbin 1 on which a shunt-wound field coil 2 is wound as shown in FIGS. 2 and 3. It is.

First, the bobbin 1 is made of molded insulating resin and has flexibility. This bobbin 1 has a first collar 1a which is rectangular in plan view, and a second collar which is rectangular in planar shape and which faces the first collar part 1a and has a smaller outer periphery than the first collar part 1a. Part 1b and
It is composed of a rectangular cylindrical portion 1c that connects the inner periphery of the first flange portion 1a and the inner periphery of the second flange portion 1b. Further, the width of the cylindrical portion 1c is the same as that of the series-wound field coil 3.
The width is set to be approximately the same as the width of the flat side of the
The series field coil 3 is held without wobbling between the opposing portions of the first flange portion 1a and the second flange portion 1b. Furthermore, four first notches 1d are formed on the side surface of the first flange 1a, and a second notch 1e is formed on the upper surface of the first flange 1a.

Next, the shunt field coil 2 is a coated round wire and is wound around the outer periphery of the cylindrical portion 1c of the bobbin 1. Further, the outer periphery of the shunt field coil 2 is arranged inside the outer periphery of the second collar portion 1b.
Further, the terminal wire of the shunt field coil 2 is covered with an insulating tube, and is bent from the outer periphery of the cylindrical portion 1c and extends along both sides of the second notch portion 1e. Then, the tape 5a is passed through the second notch 1e and wound around the outer periphery of the shunt field coil 2 and inside the cylindrical portion 1c, thereby fixing the shunt field coil 2 to the bobbin 1.

As shown in FIG. 4, the series-wound field coil 3 has a terminal wire 3a at one end placed in the upper center, and is bent from the terminal wire 3a to form a shunt-wound field coil wound around the bobbin 1. It is formed by winding it five times in a rectangular shape along the outer periphery of 2.
As shown in FIG. 5, the molded series field coil 3 is arranged along the inner circumference of the yoke 6 shown in FIG.
Shaped into an arc. Furthermore, the terminal line 3b at the other end
The terminal wires 3a and 3b protrude upward, and the flat surfaces of the terminal wires 3a and 3b face toward the inner periphery so that other lead wires can be easily connected. At the locations where the terminal wires 3a and 3b protrude, the series-wound field coil 3 is held in its molded state by a tape 4 for holding the series-wound field coil 3.

This series-wound field coil 3 is arranged so that the outer periphery of the shunt-wound field coil 2 of the bobbin 1, on which the shunt-wound field coil 2 is wound, and the first and second brim portions of the bobbin 1 are opposed to each other, as shown below. It is assembled into a holding part formed at the part. That is, by temporarily elastically deforming the cylindrical portion 1c and the second collar portion 1b of the bobbin 1 to make the outer circumferential edge of the second collar portion 1b smaller than the inner circumferential width of the series-wound field coil 3, The wound field coil 3 can be inserted. Then, the inner circumference side of the series-wound field coil 3 is fitted to the outer circumference of the shunt-wound field coil 2, and the tape 5
are wound through the respective first notches 1d, and the series-wound field coil 3 is securely fixed to the bobbin 1. At this time, the first collar portion 1a, the cylindrical portion 1c, and the shunt field coil 2 of the bobbin 1 have a shape that follows the arc shape of the series-wound field coil 3, which has been bent and shaped, as shown in FIG. Become. Further, the series-wound field coil 3 and the shunt-wound field coil 2 are wound in the same direction.

Then, as shown in FIG. 6, the bobbin 1 formed as described above is fixed to the yoke 6. The pole core 7 has a support portion 7a passing through the inner circumference of the bobbin 1.
and a curved surface portion 7b that covers the radially inner peripheral side of the bobbin 1. Then, in the hole 6a of the yoke 6,
The support portion 7a is fixed to the inner periphery of the yoke 6 by screws 8.

Next, to explain the electrical wiring diagram shown in FIG. 7, the power supply is connected via the starter switch 9.
The connection points of the attraction coil 10 and the holding coil 11 are connected. Further, 13 is a plunger, which moves the clutch 15 and pinion 15a forward via the lever 14. The main contact 16 is connected to a power source at one end and to the series field coil 3 at the other end. The holding coil 11 is connected to four shunt field coils 2 in series. In addition, the shunt field coil 2 connected to the holding coil 11
is arranged on the inner periphery of the series-wound field coil 3.
12 is an armature, and the rotation of this armature 12 is transmitted to a pinion 15a.

First, the effect of the shunt field coil 2 according to the present invention is to affect the meshing performance of the starter, as shown in the circuit diagram shown in FIG. First, start switch 9
By closing, the suction coil 1 is removed from the DC power supply.
A current flows through the holding coil 11 and the holding coil 11. Then, the shunt field coil 2 is energized via the holding coil 11. Furthermore, the current flowing through the attraction coil 10 is
The armature 12 is energized through the series-wound field coil 3, and with the field force generated by the shunt-wound field coil 2, a rotational force is generated in the armature 12 with low torque, and at the same time, the attraction coil 10 and the holding coil 1 are
1, the plunger 13 is attracted, and the lever 1
4, clutch 15 and pinion 15a
is brought into contact with a ring gear on the engine side (not shown), and by low torque rotation of the armature 12,
The pinion gear 15a of the clutch 15 and the ring gear are engaged. Then, the main contact 16 is closed, and a current is passed from the DC power supply to the series-wound field coil 3 to further rotate the armature 12 and operate the starter.

Therefore, in a low current torque mesh type starter that requires a shunt field coil that performs the above action, it is necessary to mount the shunt field coil 2 and the series field coil 3 on the same pole core 7. It is.

That is, the shunt field coil 2 is directly wound around the molded bobbin 1, and the shunt field coil 2 is further wound around the shunt field coil 2.
By fitting the already molded series field coil 3 on the outside of the coil and securing it with tape 5, even if heat is generated in the series field coil 3, the second flange 1b is small. Heat can be sufficiently dissipated to the outside,
Assembly is also easy, just by fitting the series field coil 3 onto the bobbin 1. Furthermore, the first notch 1d ensures tape fixing of the series field coil 3 and the shunt field coil 2 to the bobbin 1, and
The cutout portion 1e ensures secure tape attachment when the shunt field coil 2 is attached to the bobbin 1 with tape.

In the above embodiment, the shunt field coil 2 is wound around the outer periphery of the cylindrical portion 1c of the bobbin 1, but the shunt field coil 2 and the bobbin 1 may be molded together. good.

Further, although the screws 8 are used to fix the pole core 7 to the yoke 6, this may be done by welding or using a welding agent, or by protruding a protrusion from the support portion 7a and attaching this protrusion to the hole in the yoke 6. 6a may be passed through and fixed by caulking.

[Effect of idea]

As described above, in the present invention, since the outer periphery of the second flange is smaller than the outer periphery of the first flange, the series field coil is exposed to the air.
The heat generated in this series-wound field coil can be effectively dissipated. Further, the series-wound field coil is held in a holding portion formed by the outer circumference of the shunt-wound field coil wound around the outer circumference of the cylindrical portion of the bobbin and the opposing surfaces of the first and second brim portions. Therefore, the series-wound field coil can be reliably positioned and held with respect to the bobbin, and since the bobbin is flexible, the outer circumferential edge of the second collar can be made smaller than the inner circumferential width of the series-wound field coil. The series-wound field coil can be easily disposed in the holding portion by elastically deforming to become smaller, and is excellent in assembly.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the field coil in the electric motor of the present invention, FIG. 2 is a front view of the bobbin shown in FIG. 1, FIG. 3 is a plan view of the bobbin shown in FIG. The figure is a front view of the series-wound field coil shown in Fig. 1, Fig. 5 is a plan view of the series-wound field coil shown in Fig. 4, Fig. 6 is a sectional view showing the main parts of the motor of the present invention, FIG. 7 is an electrical circuit diagram of the motor of the present invention. 1... Bobbin, 1a... First collar, 1b...
...Second collar portion, 1c...Cylinder portion, 2...Shunt-wound field coil, 3...Series-wound field coil.

Claims (1)

[Claims for Utility Model Registration] A first flange portion, facing the first flange portion,
a second flange having an outer periphery smaller than the outer periphery of the first flange, and a cylindrical portion connecting the inner periphery of the first flange and the inner periphery of the second flange. a shunt-wound field coil wound around the outer periphery of a cylindrical portion of the bobbin, the outer periphery of which is disposed inner than the outer periphery of the second flange; , an inner peripheral width is slightly smaller than the outer peripheral edge of the second flange of the bobbin, and a holding part is formed at the outer periphery of the shunt field coil and opposing parts of the first and second flange parts. An electric motor equipped with ring-shaped series-wound field coils arranged.