JPH0150314B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for drawing out lead wires from a stepper motor type multi-polar motor, and more specifically, by adding an ingenuity to the shape of the stator yoke and adopting a specially shaped lead terminal member. This makes assembly work easier.

The multi-polar motor to which the present invention is directed is conventionally known as, for example, a stepper motor or a constant speed motor. This type of motor includes an outer rotor type and an inner rotor type. Of course, an outer rotor type motor has a basic structure in which the rotor, which is rotatably supported, is located on the outer circumferential side, and the stator with built-in coils is located on the inside, so it is easy to have multiple poles (magnetic pole teeth (Because the circumference of the stator yoke portion where the stator yoke is formed is long), it has the advantage of being able to increase the torque, but on the other hand, it is troublesome to draw out the lead wire from the internal coil. In addition, the basic structure of an inner rotor type motor is that the rotor, which is rotatably supported, is located on the inner circumferential side and the stator with a built-in coil is located on the outside. In a different sense from the outer rotor type, improvements were desired in terms of reliability, ease of work, miniaturization of the motor, etc.

Coils used for excitation of stators are generally made of a synthetic resin bobbin with flanges integrally molded on both ends of a toroidal body, and magnet wires (such as enameled wires with a small diameter of a few tenths of a millimeter) are attached to the bobbin. is wrapped many times. Since it is necessary to supply power to such a magnet wire to form an excitation field, it is of course necessary to be able to electrically connect an external drive circuit or the like to the magnet wire.

However, as mentioned above, the magnet wire used in the stator's annular coil is extremely thin and cannot be pulled out of the motor casing as is. It is designed to connect to a wire and pull out the lead wire.
In other words, conventionally, as shown in FIG.
The end of the magnet wire 2 is wrapped around the tip core of the insulated lead wire 3, and after soldering, each connected portion is covered with insulating tape 4, and then the connected portion is Adhesive tape 5 is placed along the outermost periphery of the magnet wire winding part.
It was supposed to be fixed in place. In the case of a stepper motor, it is generally bifilar wound, so three lead wires are drawn out for each coil.

However, the task of arranging these three separate lead wires, arranging them along the magnet wire windings, and fixing them with adhesive tape is extremely difficult, as you can clearly see by actually doing it. It is a very tedious task. Furthermore, such a fixing structure had the disadvantage that when tensile force was applied to the lead wire for some reason, the lead wire would slip out from the side of the adhesive tape (low tensile strength). Therefore, attempts have been made to tie the lead wires with string and then fix them with adhesive tape. It is true that this improves the tensile strength, but the work of tying this thread is also extremely troublesome, and it is difficult to tie, which may cause loosening, and there are many points that need to be improved in terms of reliability and cost.

Further, such a lead wire drawing structure can be adopted only when a bobbin is provided, and in the case of a bobbinless thin coil, the work of fixing the lead wire becomes even more difficult. Furthermore, it is possible to draw out several (for example, 6 to 8) lead wires covered with a thick wall from inside the motor to the outside.
This is troublesome regardless of the outer rotor type, but especially with the outer rotor type, it is even more troublesome because it must be done in a way that does not interfere with rotor rotation, and the lead wires must be sufficiently protected, so a case is necessary. It might even get bigger than it is.

The purpose of the present invention is to solve the problems of the conventional technology, to greatly simplify the assembly work of the motor, to be able to sufficiently cope with the reduction in the thickness of the coil, and to make the entire motor smaller and thinner. An object of the present invention is to provide a structure for drawing out lead wires from a stepper motor type multipolar motor.

In order to achieve such an object, the present invention removes a part of the stator yoke from a state where all the magnetic pole teeth are completely aligned to create a magnetic pole tooth missing part, and also creates a magnetic pole tooth missing part here. Install the cover,
A hole is made in the cover part corresponding to the missing part of the magnetic pole tooth,
Attach a lead terminal member made of an insulator to this hole, pull out the coil winding magnet wire directly to the outside without coming into contact with metal parts such as the stator, wrap it around the lead pin fixed to the lead terminal member, and solder it. By attaching the connector to the external wiring, it can be connected to external wiring via the connector.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings, taking an outer rotor type as an example. FIG. 2 is an exploded perspective view showing an example of an outer rotor type multipolar motor to which the present invention is applied. This embodiment has a new and different idea of using a positioning spacer for positioning the stator yoke, but in carrying out the present invention, it is not necessary to rely on such an internal structure of the motor. It will be easy to understand from the following explanation that the present invention is applicable not only to a conventional motor but also to a conventionally known motor.

The motor to which the present invention is applied has a plurality of stator yokes 11 arranged in series on the shaft center, and a large number of magnetic pole teeth 12 protruding from the inner or outer peripheral surface of the stator yokes 11 substantially parallel to the shaft center. The yokes 11 are combined so that the magnetic pole teeth 12 are offset from each other, and a coil 13 is installed on the outer periphery or inside of these magnetic pole tooth groups.
an annular magnet 15 which is rotatable around the axis, is arranged to face the inner circumferential surface or outer circumferential surface of the magnetic pole tooth group, and is further magnetized with multiple poles. The motor is an inner rotor type or an outer rotor type motor.

In this embodiment, since the stator yoke 11 has a plate-like structure, a yoke ring 20 is placed on the inner circumference to close the magnetic path, and a positioning annular spacer having a positioning protrusion 21 is provided. 2
2 is incorporated into the inner peripheral portion of the magnetic pole tooth group of the stator yoke to be combined. Further, the coil 13 has a bobbinless structure in order to achieve ultra-thinness, and an insulating paper is interposed between the coil 13 and the stator yoke 11, although not shown.

Now, in the present invention, the stator yoke 11 is
It does not have a shape with magnetic pole teeth that are perfectly aligned over the entire circumference, but has a shape that looks as if a portion of the magnetic pole teeth have been cut away. In this embodiment, the magnetic pole tooth missing portion 25 has a shape in which one magnetic pole tooth is completely missing, but it may have a shape in which a part of the magnetic pole tooth is removed. A cover 30 is attached to one end surface of the excitation stator 14.

The cover 30 is dish-shaped and has a bearing 31 in the center.
It also has a mounting flange 32 on its outer surface.
Further, a hole 33 is provided near the outer periphery of the cover 30 at a location corresponding to the magnetic pole tooth missing portion 25 of the stator yoke, and a raised claw 34 is provided near the hole 33. A lead terminal member 40 made of an insulating material is attached using the claw 34 and the outer circumference of the cover 30.

This lead terminal member 40 includes a terminal holder part 42 located on the outer periphery of the cover 30 and holding a plurality of U-shaped lead pins 41 with the tips of the pins protruding outward;
A lead pull-out portion 45 having a through hole 43 that is smaller than the hole 33 of the cover 30 and located substantially concentrically, and a groove 44 that extends from the through hole 43 toward the outer peripheral edge.
It is a structure in which the two are integrated. More specifically, the lead pull-out portion 45 is provided with a locking hole 46 into which the claw 34 described above penetrates, and the protrusion 48 provided by the terminal holder portion 42 and the proximal end of the lead portion 45 are connected to the cover 30. The lead terminal member 40 is fixed by pinching the outer periphery and bending the claw 34 inserted into the locking hole 46. Furthermore, as can be seen from FIG.
An edge 47 having the same thickness as the cover 30 is formed around the through hole 43, and the groove 44 has a dovetail shape.

Magnet wire 50 for winding each coil 13
is pulled out to the outside of the excited stator 14 through the magnetic pole tooth missing portion 25 of the stator yoke 11 (inner peripheral side of the positioning annular spacer 22), and is inserted into the through hole 43 of the lead portion that is fitted into the cover 30. is pulled out to the outside of the motor. The drawn-out winding magnet wires 50 are buried in the grooves 44 and guided to the outer periphery of the case, tied around predetermined lead pins 41, and subjected to a soldering process.

With this structure, the winding magnet wire 50 does not come into contact with metal objects such as a cover, and the coating is not damaged. That is, the hole 33 of the cover 30
Even at the point where the hole 33 is inserted and bent, the hole 33 is guarded by a smaller through hole 43 and its edge 47, and after exiting to the outer surface, it is completely guarded by being accommodated in the groove 44. This is because that. In particular, if the thickness of the lead pull-out portion 45 is made equal to or less than the thickness of the flange 32, it will not interfere with the motor installation.

After assembling in this manner, by inserting a connector connected to an external lead wire into the lead pins 41, connection to an external circuit can be made with a single touch.

Although a preferred embodiment of the present invention has been described above in detail, it is not limited to this structure only, and it goes without saying that various changes may be made to the shape of the lead terminal member and the like within the scope of the present invention.

Since the present invention is a lead wire drawing structure for a stepper motor type multi-polar motor as described above, it can significantly simplify the motor assembly work, especially the complicated lead wire drawing work, and greatly contribute to reducing assembly costs. In addition, it is possible to use a bobbinless coil, and the winding magnet wire is directly pulled out to the outside, making it possible to make the motor thinner and smaller. It is possible to connect with external circuits, etc.
It can have many excellent effects.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional coil lead wire drawing state; Fig. 2 is an exploded perspective view showing an example of a motor to which the present invention is applied; Fig. 3 is an assembled perspective view;
The figure is a cross-sectional view. 11... Stator yoke, 12... Magnetic pole teeth, 1
3... Coil, 14... Excitation stator, 15...
Annular magnet, 16... Rotor, 25... Magnetic pole tooth missing part, 30... Cover, 33... Hole, 40... Lead terminal member, 41... Lead pin, 42... Terminal holder part, 43... Penetration Hole, 44...Groove, 45...
...Lead drawer section.

Claims (1)

[Claims] 1. A large number of magnetic pole teeth 12 are provided on the inner peripheral surface or outer peripheral surface of a plurality of stator yokes 11 arranged in series on the axis, and protrude substantially parallel to the axis, and the stator yokes 11 are arranged in series on the axis.
1 comrades are combined so that the magnetic pole teeth 12 comrades are offset from each other, and an excitation stator 14 is formed by winding a coil 13 around the outer or inner periphery of these magnetic pole tooth groups, and is rotatable about the axis. , and arranged opposite to the inner circumferential surface or outer circumferential surface of the magnetic pole tooth group,
In a multi-polar motor further comprising a rotor 16 having a multi-pole magnetized annular magnet 15, the stator yoke 11 has magnetic pole teeth 12.
A magnetic pole tooth missing part 25 is formed by cutting out a part of the stator yoke 11, and a hole 33 is formed on one end surface of the excitation stator 14 at a location corresponding to the magnetic pole tooth missing part 25 of the stator yoke 11. A cover 30 is joined to the cover 30. A lead terminal member 40 formed of an insulating material is attached to the cover 30.
a terminal holder portion 42 located on the outer periphery of the terminal and from which a lead pin 41 protrudes; and the hole 33 of the cover 30.
A lead drawer portion 45 having a through hole 43 smaller than the hole 33 and communicating with the hole 33, and a groove 44 extending from the through hole 43 to the terminal holder portion 42.
The winding magnet wire 50 taken out from the coil 13 is inserted into the through hole 4 of the lead extraction part 45.
3 to the outside of the excitation stator 14, and then passed through the groove 44 of the lead pull-out part 45 and wrapped around the lead pin 41.
A structure for drawing out lead wires from a multi-pole motor, which is characterized by being soldered to.