JPH05199683A - Molded motor - Google Patents

Abstract

PURPOSE:To reduce the occurrence of defects and easily assemble a molded motor by erecting struts for fitting a bracket having diameters wider than the widths of tooth sections at prescribed locations near the openings of slots for winding toroidal coil on an iron core in which the slots are formed of the plurality of tooth sections protruding inward. CONSTITUTION:A plurality of tooth sections 2 are protruding inward from an annular yoke 7. A toroidal coil is wound in slots 3 which are formed between tooth sections 2 and the widths of which at their bottom sections are wider than those of their openings with an insulating layer 4 in between. The openings of the slots 3 are used as first contacts 6 and the corner sections between the yoke 7 and tooth sections 2 are used as second contacts 8. Struts 5 having diameters larger than the widths of the sections 2 are erected toward the axial direction near the end sections of the sections 2 so that the struts 5 can be positioned on the sections 2 side of tangential lines A connecting the contacts 6 and 8 to each other. A bracket is fixed by screwing screws in tapped holes provided at the end sections of the struts 5. Therefore, a product which has a strong strength and in which winding defects hardly occur can be easily assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold electric motor in which a toroidal winding is formed on an annular iron core and the outer shell is molded by a member such as a premix.

[0002]

2. Description of the Related Art In a mold electric motor in which an iron core is wound and a shell is molded by a member such as a premix, a frame is composed of a premix. When fixing the brackets, the brackets can be directly glued, the brackets on both sides of the frame can be attracted to each other by the bolts that pass through, or the fitting part with radial unevenness can be formed. Then, various methods such as a method of fitting a bracket are adopted.

However, since all of them are often inconvenient, a stop ring is attached to the shaft of a rotor passing through the bracket on the outside of the bracket as described in Japanese Patent Publication No. 63-1013, and the bracket is framed. Attempts have been made to hold each other so that they do not fall from the outside, and they are preferred because of their high mechanical strength.

However, when the stop ring is attached to the shaft in the vicinity of the bracket, the jig for supporting the stop ring comes into contact with the bracket, so that the assembly is not always smooth and the bracket is not damaged. Had to do. Furthermore, under such conditions, it was difficult to carry out mechanization.

Therefore, a frame composed of a premix is used.
It has been attempted to attach a bracket by forming a hole in the hole and forcibly screwing the screw with a tapping screw.

This method facilitates mechanization and rationalizes assembly of a large number of mold electric motors.

In this case, however, the premixed frame is formed in the premix even if a large torque is required when the tapping screw is screwed, even if the tapping screw is loosened and screwed again. Also, the screw thread collapsed, and the screwing force was lost.

Therefore, at the time of molding, a predetermined portion of the frame is filled with metal or a resin-made screw receiving seat is embedded.

With such a method, sufficient mechanical strength was obtained, and it was easy to promote mechanization in assembly.

However, there is also a problem with this, and in the case of a buried metal, it is necessary to attach the buried metal to the mold type at the time of molding, and usually there are a plurality of buried metals. Increased and became a disadvantage.

Further, the method of burying the resin screw receiving seat is advantageous in the process as compared with the method of filling the metal, but the screw receiving seat is mounted by utilizing the gap between the slot and the winding. It had to be kept and the location was limited.

In particular, since the bracket is made of a magnetic material such as a steel plate, the magnetic flux of the stator will leak if it is made large, which will directly affect the performance and thus limit external damage. Since the inner diameter side must be provided with a bearing, the screw for attaching the bracket to the frame is a very limited portion in the radial direction.

Under such circumstances, if an unreasonable design is performed, defects occur in the manufacturing process, and as a result, rationalization cannot be achieved.

Moreover, when the molded mold of the mold and the tip of the screw receiving seat are brought into contact with each other, the screw receiving seat may move,
It was necessary to devise a method for fixing the screw receiving seat, and it was sometimes difficult to implement depending on the structure of the stator core and the winding.

The present invention has been made in view of the above circumstances, and has a structure in which a bracket can be easily attached with a screw without causing a trouble in a winding or the like, and a module which is easy to assemble with few defects is obtained. -The purpose is to provide a rudder motor.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a mold electric motor in which a toroidal winding is formed on an annular iron core having slots formed by a plurality of teeth protruding toward the inner circumference. An insulating layer for insulating the iron core and the winding is formed, a pillar extending in the axial direction is formed on an end surface of the tooth portion of the insulating layer, and a hole for a screw is formed at an end of the pillar. A diameter of the column is larger than a width of the tooth portion, an opening portion of the slot formed by the tooth portion serves as a first contact point, and a corner portion between the yoke and the tooth portion of the slot serves as a second contact point; The problem is solved by accommodating the side surface of the slot on the tooth side of the tangent line between the first contact and the second contact.

[0017]

[Operation] The column formed by using the insulating layer can be made larger without being restricted by the width of the teeth, and is outside the traveling range of the winding wound in the slot. There is no obstacle such as the wire getting caught on the pillar during traveling, sufficient mounting strength for the screw can be obtained,
In the manufacturing process, the bracket can be strongly tightened and fixed with screws, there is no defect in the winding, and the width of the pillar to which the screws are screwed is independent of the width of the teeth, so increase the diameter of the screw. Since it is possible to perform standardization, and since it is possible to design the wall thickness of the outer periphery of the screw hole of the support column so that there is no shrinkage, the screwing strength of the screw can be increased.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a plan view of a main portion of a core of a molding motor according to an embodiment of the present invention in which a resin layer is formed. ..

FIG. 2 is an enlarged perspective view for facilitating the understanding of the main part.

FIG. 3 is an enlarged plan view of an essential part showing a state in which the winding is applied.

FIG. 4 is a vertical cross-sectional view of the main part where the winding is applied.

FIG. 5 is a perspective view of an essential part showing a state where the iron core is wound.

In FIG. 1, an annular iron core 1 is provided with a plurality of teeth 2 on its inner peripheral side to form a slot 3, and a resin pre-mold is formed on the outer periphery of the tooth 2 excluding the inner peripheral side. -The insulating layer 4 is formed by a groove.

A pillar 5 is formed on the axial end surface of the tooth 2. The pillar 5 has an outer diameter slightly larger than the width of the tooth 2. It came out and jumped to slot 3.

However, as indicated by the tangent line A in the figure, the opening portion of the slot 3 by the tooth portion 2 serves as the first contact 6, and the corner portion between the yoke 7 of the slot 3 and the tooth portion 2 serves as the second contact 8.
The column 5 is located on the side of the tooth 2 of the tangent line A.

In FIG. 2, the outer periphery of the iron core 1 excluding the inner diameter side of the tooth portion 2 is formed of a resin pre-molded with an insulating layer 4, and the pillar 5 has an outer diameter of the tooth portion 2. It is a little larger, and it protrudes into slot 3.

Then, a screw is attached to the column 5 to attach a screw 9
Is formed, and in this embodiment, a tapping screw having a self-tapping action is screwed as the screw.

In FIG. 3, the winding 10 is provided in the slot 3.
When a predetermined amount is wound in the slot 3, the winding 10 is wound up to the lower part of the column 5 as shown in the winding 10a, and is wound around the yoke 7. In the mounted state, as shown by the winding 10b, the state in which the winding 10 is closest to the support 5 is such that the contact 6 of the tooth portion 2 and the slot 3 are
Is located at the tangent A to the contact 8 formed by the corners of the winding 10, and the winding 10 is wound around the yoke 7 while the iron core 1 is swung about the opening of the slot 3. It is configured.

In FIG. 4, in the winding 10, an insulating layer 4 is formed on the iron core 1, and a pillar 5 is formed integrally with the insulating layer 4. The pillar 5 has an outer diameter larger than the width of the tooth portion 2. It becomes larger and the side part protrudes into the slot 3.

Then, the winding wire 10 is provided up to the lower side of the pillar 5 protruding into the slot 3.

In FIG. 5, in the winding machine, the iron core 1 is gripped by the gripping tool 11, and the gripping tool 11 is configured to swing around the opening of the slot 3 by the base 12. And the base 12 around the opening that is the center of swing.
Is rotated to sequentially wind the windings 10 around the plurality of slots 3.

The winding 10 is wound by a cylindrical flyer-1.
3 is performed at a high speed of about 2000 revolutions per minute, and a predetermined rotation, that is, a predetermined amount of winding 10
Is stopped when it is wound, and the winding position is changed so that the winding 10 is wound in the next slot 3 by the rotation of the base 12.

The gripping tool 11 is composed of two plate-shaped jigs and is configured to grip the end portion of the iron core 1. The iron core 1 is held by the base 12 while holding the iron core 1. 1 is rotated with respect to the flyer 13 so as to be in a predetermined position.

In such a structure, the mold electric motor comprises punching steel plates by a press and laminating a predetermined amount to form an iron core.

When the iron core 1 is constructed, it is mounted in a pre-molded shaping mold, and the outer circumference is pre-molded with resin leaving only the inner circumference side of the tooth portion 2 to form the insulating layer 4.

Then, the pillar 5 and the hole 9 formed in the pillar 5 are integrally formed together with the insulating layer 4 during the pre-molding.

Since the outer diameter of the strut 5 is larger than the width of the tooth portion 2, it is difficult to remove the shaping mold in the direction of the strut 5, but the tooth portion 2 on which the strut 5 is formed is difficult. If the columns 5 are not formed at the same position on the opposite side, that is, on the end face on the opposite side of the iron core 1, it becomes easy to pull out the shaping mold in the direction in which the columns 5 are not present.

Therefore, the molding die can be pulled out in the two axial directions as usual, and the premolding can be performed without any support by the conventional molding technique.

At this time, preferably, the support column 5 is the iron core 1
It is preferable that the bracket is formed only on one end face and the bracket in the direction in which the support column 5 is not formed is integrally formed by the premix mold when the frame is formed in a later step.

After the insulating layer 4 is formed on the iron core 1, the holding tool 11 of the winding machine shown in FIG. 5 holds the iron core 1 and the winding 10 is wound by the flyer 13.

At this time, the winding 10 becomes a mountain shape when wound at the same position of the yoke 7, and the winding 10 is wound later.
When it is pressed by, the mountain becomes collapsed, so that the mountain has an irregular posture, and the winding 10 is wound from above, so that the iron core 1 is swung by the base 12 of the winding machine.

This swinging can be easily performed by the method as shown in Japanese Patent Publication No. 62-56744 which has already been registered.

Further, when the iron core 1 is swung in this manner, the winding 10 should not come into contact with the tooth portion 2 at the end dead center of the swing. If the winding 10 being wound comes into contact with the tooth portion 2, the outer cover of the winding 10 is damaged, or in the worst case, the winding is broken.

Therefore, in this swing, the center point of the swing must be set in the vicinity of the opening of the slot 3. In this case, the positional relationship between the flyer 13 and the iron core 1 is that the tooth near the opening. The winding 10 is set so as not to contact the portion 2, and the position of the tangent line A in FIG. 3 becomes the limit.

Therefore, when the outer diameter of the support column 5 becomes large, there is a possibility that the winding 10 may be caught by the support column 5 while the winding 10 is wound.

However, the support column 5 has the tooth portion 3 of the tangent line A.
Since it is housed on the side, the problem that the winding wire 10 is caught on the column 5 does not occur.

Moreover, since the pillar 3 is formed independently of the slot 3, the effective volume of the slot 3 for accommodating the winding wire 10 is not reduced by the pillar 5, and the linear occupation ratio of the slot 3 is It becomes independent of the stanchions.

Of course, even if the external rule of the pillar 5 is extended to the inside of the slot 3, there is no problem unless the winding 10 of the slot 3 is accommodated.

Further, since the tooth portion 2 only needs to have the minimum necessary width for the magnetic flux to pass, the width of the tooth portion 3 can be set independently of the support column 5, so that the weight of the iron core 1 is minimized. be able to.

When all the windings 10 are wound around the iron core 1 as described above, the divided iron cores 1 are combined to form an annular shape and then mounted on a premix mold to form a frame. Form.

At this time, the pillar 5 is molded so as to be exposed on the outer surface of the frame, and after completion, a bracket (not shown) is mounted and fixed to the pillar 5 with screws.

Further, since the support column 5 can be formed regardless of the width of the tooth portion 2, it is possible to form a wall thickness required for a hole for screwing a screw, and to set the wall thickness to be uniform. Therefore, the shrinkage after molding becomes uniform, and the coupling force when the tapping screw is screwed is maximized.

Moreover, since the required thickness can be formed, the outer diameter of the tapping screw can be made relatively large, and the number of tapping screws can be minimized.

The tapping screw does not have to be infinitely large and has an outer diameter sufficient to accommodate the tapping screw having a required outer diameter in a small mold electric motor of about 5 to 100 watts.

[0055]

According to the present invention, the column formed without being limited by the width of the tooth portion can be designed so as not to be caught in the wall thickness of the outer periphery of the screw hole, and to have an outer diameter required for the screw. It can be made large, so that sufficient mounting strength for the screw can be obtained, and since it is formed outside the traveling range of the winding wound in the slot, the winding catches on the column during traveling with respect to the winding In addition, the occurrence of faults in the windings is reduced, and the width of the teeth can be reduced independently of the support columns, so that the slot volume can be increased and the electric motor can be reduced together with the iron core. ,
Since the screws can be easily screwed into the columns, standardization is possible and the mechanization of the assembly is facilitated.
It has a great effect on the manufacture of the field motor.

[Brief description of drawings]

FIG. 1 is a plan view of a main portion of a molding machine according to an embodiment of the present invention, in which a resin layer is formed on an iron core.

FIG. 2 is an enlarged perspective view for facilitating understanding of a main part thereof.

FIG. 3 is an enlarged plan view of a main part showing a state in which a winding is applied.

FIG. 4 is a vertical cross-sectional view of a main part where a winding is applied.

FIG. 5 is a perspective view of relevant parts showing a state in which a winding is applied to the iron core.

[Explanation of symbols]

 1 ... Iron core 2 ... Tooth portion 3 ... Slot 4 ... Insulating layer 5 ... Strut 9 ... Hole 10 ... Winding 11 ... Gripping tool 12 ... Base 13 ... Flyer

Claims (1)

[Claims] 1. A mold electric motor in which a toroidal winding is formed on an annular iron core having slots formed by a plurality of teeth protruding inward, and the iron core and the winding are insulated from the outer circumference of the iron core. An insulating layer for forming a pillar is formed on the end face of the tooth portion of the insulating layer in the axial direction, and a hole for a screw is formed at the end of the pillar, The opening of the slot by the tooth is the first contact, the corner of the yoke and the tooth of the slot is the second contact, and the side of the strut on the slot side is the first contact. A mold electric motor which is housed on the tooth side of a tangent line between a contact and a second contact.