JPH07135753A - Method and apparatus for manufacturing motor stator - Google Patents

Abstract

PURPOSE:To obtain a motor stator which is composed of laminated cores which are firmly fixed by a method wherein a shaft is inserted into the axial direction grooves of the laminated cores to compose a motor stator, which is placed in a case and heated by induction heating and the shaft is soldered to one groove while the stator is transferred in an axial direction and then the laminated cores are turned by a predetermined angle and the shaft is soldered to all the grooves successively. CONSTITUTION:A plurality of axial direction grooves are formed in the outer circumferential surfaces of laminated cores and a shaft is inserted into the grooves to compose a motor stator 2 which is placed in a case 3. Then a gas supply apparatus 9 is operated to supply an inert gas into the case 3 and a radio frequency current supply apparatus 8 is operated to supply a radio frequency current to a heating coil 7. Then a brazing material feeder 11 is operated to bring the tip of a brazing material 10 into contact with one of the grooves of the laminated cores to melt the brazing material 10 with the heat of the laminated cores heated by induction heating while the stator 2 is transferred horizontally by a transfer apparatus 4 to braze and fix the shaft to the laminated cores. By operating a turning apparatus 5, this procedure is successively repeated on all the grooves to obtain the high quality motor stator 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a motor stator having a laminated iron core.

[0002]

2. Description of the Related Art Conventionally, a laminated iron core obtained by laminating a plurality of iron cores has been used for a motor stator. This laminated iron core has presser plates on both side surfaces thereof and is provided on the outer peripheral surface thereof. A copper shaft or the like is fitted into the plurality of grooves to fix and hold each iron core. As a method of fixing the shaft and the groove of the laminated iron core, for example, a method disclosed in JP-B-63-50943 is known. That is, this method cuts off the opening edge of the dovetail groove in an oblique manner, and forms a V-shaped welding groove between the inclined side surfaces of the steel bar (shaft) having a trapezoidal cross section inserted in the dovetail groove. Form. Then, the V-shaped groove portion is welded by MIG welding or TIG welding,
A steel bar is fixed to the dovetail groove.

[0003]

However, in this manufacturing method, there are problems that the working efficiency and the like are poor, the product cost is increased, and it is difficult to obtain a high-quality motor stator. That is, since it is necessary to perform MIG welding or the like on a plurality of grooves one by one, the work is troublesome, automation of the work is difficult and the work efficiency is poor, and the groove formed in the laminated core and the rod inserted into the groove are formed. Since the shape of the steel material becomes complicated, the cost of the parts increases and the product cost increases as a whole. Further, since welding work is performed on a fine groove, skill is required for the welding work, and it is difficult to obtain a product of stable quality. Especially, in a motor that requires high rotation and high accuracy, the difference due to resonance may occur. The reality is that noise is likely to occur and is difficult to apply.

The present invention has been made in view of the above circumstances, and an object thereof is to improve work efficiency and the like by brazing and fixing a groove of a shaft and a laminated iron core by utilizing induction heating. It is an object of the present invention to provide a method of manufacturing a motor stator and a manufacturing apparatus thereof, which can reduce the product cost and obtain a high quality motor stator.

[0005]

In order to achieve the above object, a method of manufacturing a motor stator according to a first aspect of the present invention is a laminated core in which a shaft is fitted in a plurality of axial grooves formed on an outer peripheral surface. , Set in a non-conductive, substantially sealed case in a substantially horizontal state, and after supplying an inert gas into the case,
A high-frequency current is supplied to a heating coil arranged close to the case to inductively heat the laminated iron core in the case, and the laminated iron core is moved in the axial direction in the case, and from the supply hole arranged in the case to the groove portion. Supply brazing material, braze the shaft, and then rotate the laminated core by a predetermined angle,
It is characterized in that the shaft is sequentially brazed to the groove.

Further, in the manufacturing method according to the second aspect, the laminated iron core in which the shaft is fitted in the plurality of axial grooves formed on the outer peripheral surface is substantially horizontal in a non-conductive substantially hermetically sealed case. After setting and supplying inert gas into the case,
A high-frequency current is supplied to a heating coil arranged close to the case to inductively heat the laminated iron core in the case, and the laminated iron core is moved in the axial direction in the case, while being fed into the groove from the supply hole arranged in the case. The material is supplied, the shaft is brazed, the laminated iron core is then rotated by a predetermined angle, and the shaft is sequentially brazed to the groove while cooling the case at a predetermined timing.

Further, in the motor stator manufacturing apparatus according to a third aspect of the present invention, a laminated iron core having shafts fitted in a plurality of axial grooves formed on the outer peripheral surface is provided in a non-conductive, substantially hermetically sealed case. In a substantially horizontal state, a moving means for moving in an axial direction, a rotating means for rotating a laminated iron core in the case by a predetermined angle, a current supplying means for supplying a high frequency current to a heating coil arranged in the vicinity of the case, and a A gas supply means for supplying an inert gas, and a brazing material supplying means for supplying a brazing material into the case from a supply hole provided in the case are provided.

[0008]

According to the method of manufacturing a motor stator according to the first aspect of the present invention, when a high frequency current is supplied to the heating coil after the inert gas is supplied into the case and the gas is replaced.
The laminated iron core set horizontally in the case is induction-heated. In this state, the brazing material supplied from the supply hole is
It melts along the horizontally moving groove and the shaft in the groove is brazed. After brazing one groove,
The laminated core is rotated by a predetermined angle and the next shaft is brazed. By sequentially performing this operation for all the grooves, the motor stator is obtained in which the shaft is brazed to the grooves and each iron core is firmly brazed and fixed. Further, according to the manufacturing method of the second aspect, heat generation of the case is suppressed, and the gas replacement state in the case is stably maintained.

According to another aspect of the motor stator manufacturing apparatus of the present invention, the high-frequency current is supplied from the current supply means to the heating coil in a state where the gas is replaced by the inert gas supplied from the gas supply means. To supply. The brazing material supplied from the brazing material supplying means into the case abuts on the groove portion of the laminated iron core which is induction-heated and melts, flows along the groove that moves horizontally by the moving means, and the shaft brazes into the groove. Attached. Then, the laminated iron core is rotated by a predetermined angle by the rotating means, and all the grooves are similarly brazed to obtain a motor stator in which each iron core is firmly brazed and fixed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a basic configuration diagram of a motor stator manufacturing apparatus according to the present invention. In FIG. 1, a manufacturing apparatus 1 includes a case 3 in which a motor stator 2 is disposed, a moving device 4 for horizontally moving the motor stator 2 in the case 3, and a motor stator 2 rotating. Rotating device 5, a lid moving device 6 for moving the lid 3c of the case, a heating coil 7 arranged so as to surround the case 3, and a high-frequency current supply device for supplying a high-frequency current to the heating coil 7. 8, a gas supply device 9 for supplying an inert gas into the case 3, a brazing material supply device 11 for supplying a brazing material 10 into the case 3, and a control device 12 for controlling these.
Etc.

From the outer diameter of the motor stator 2, the case 3 is
For example, there is a cylindrical case body 3a having a diameter about twice as large as that of the case body 3a formed of a transparent non-conductive quartz tube, and a quartz tube or other Lids 3b and 3c made of a non-conductive material are fitted into each other. On the upper surface of the case body 3a, a brazing material supply hole 14 is formed at a substantially central position in the longitudinal direction, and at a position facing the supply hole 14 on the circumferential line, that is, on the lower surface of the case 3, A gas supply hole 15 is provided. A supply valve 16 connected to the gas supply device 9 is disposed in the gas supply hole 15.

A gas discharge hole 17 is formed at an appropriate position of the case body 3a, and a discharge valve 18 is arranged in the discharge hole 17. In addition, in the brazing material supply hole 14,
If necessary, it has a hole substantially the same as the outer diameter of the brazing material 10,
A non-conductive bush or the like (not shown) is fitted.

A screw shaft 21 is rotatably arranged in the center of one lid 3b via a bearing 20, and one end of the screw shaft 21 located inside the case 3 is fitted. The part 22 is fixed. In addition, the moving device 4 is provided at a portion of the screw shaft 21 protruding outside the case 3.
Is provided. The moving device 4 includes a motor 23, a gear 24 screwed to the screw shaft 21, and the like.
The gear 24 is rotated by rotating 3 to move the screw shaft 21 in the arrow A or B direction.

A rotating shaft 26 is rotatably disposed in the center of the other lid 3c via a bearing 25, and one end of the rotating shaft 26 located inside the case 3 is fitted. The part 27 is fixed. Further, the rotating device 5 is arranged in a portion of the rotating shaft 26 protruding outside the case 3. The rotating device 5 includes a motor 28 and a connecting member 29 connected to the rotating shaft 26. The connecting member 29 is the motor 2
8 rotates, for example, the rotary shaft 26 is chucked and rotated by a predetermined angle, and when the motor 28 does not rotate, the rotary shaft 26 is simply supported, and the axial movement of the rotary shaft 26 is allowed. It is configured as follows.

A lid moving device 6 is connected to the lid 3c. The lid moving device 6 has, for example, an air cylinder or the like (not shown).
The lid 3c connected to the shaft is moved in the arrow C or D direction. An appropriate seal member (not shown) is provided at the fitting portion between the lids 3b and 3c and the case body 3a.

As shown in FIGS. 2 and 3, the motor stator 2 has a laminated iron core 30 in which a plurality of iron cores 30a, 30b, ... Are laminated. The pressing plates 31a, 31b and 32a, 32b are arranged, respectively. Further, on the outer peripheral surface of the laminated iron core 30, for example, eight grooves 33a to 33h are formed in the axial direction. Circular shafts 34a to 34h made of copper are fitted in the grooves 33a to 33h.
Both ends of 34h are slightly projected from the pressing plates 31a and 32a. Further, a through hole 35 into which a motor rotor (not shown) is fitted is formed in the central portion of the laminated iron core 30, and fitting portions 22 and 27 are fitted to both ends of the through hole 35, respectively.

The heating coil 7 is formed by winding a copper pipe a predetermined number of times, and both ends of the pipe are connected to a high frequency current supply device 8. A hose connector (not shown) is fixed to both ends of the pipe, and this is connected to a cooling water supply device (not shown) provided in the high frequency current supply device 8, for example. Then, at the time of heating, the cooling water is circulated and supplied from the cooling water supply device into the heating coil 7,
Heat generation of the heating coil 7 is suppressed. The high frequency current supply device 8 is composed of, for example, a current type inverter using a power semiconductor switching element such as FET, SIT, or IGBT, and outputs a high frequency current of a predetermined frequency.

The gas supply device 9 is, for example, an argon gas,
An inert gas such as nitrogen gas is supplied into the case 3 through the supply valve 16 at a predetermined pressure. The brazing material supply device 11 is
For example, a wire-shaped silver solder wound around a roll (not shown) is sent out by a pair of rollers rotated by a print motor, and this is supplied into the case 3 from the supply hole 14 of the case body 3a.

Next, a method of manufacturing the motor stator 2 in the manufacturing apparatus 1 will be described with reference to the flowchart of FIG. Note that this flow chart is mainly for the control device 1.
It is executed by a CPU (Central Processing Unit) (not shown) provided in the unit 2. First, the program starts (S
100), the lid moving device 6 is operated by the control signal of the control device 12 to move the lid 3c in the direction of arrow C in FIG. 1 (S101), and remove it from the case body 3a. At this time, the rotary shaft 26 also moves in the same direction as the lid 3c moves.

When the lid 3c is removed, the laminated iron core 30 is assembled as shown in FIG. 2 and the iron cores 30a, 30b ... Are laminated at a predetermined pressure by an appropriate method. Insert into the case 3 from the side opening,
The screw shaft 2 is inserted into the through hole 35 on one end side of the laminated iron core 30.
The fitting portion 22 of No. 1 is fitted. The laminated core 30 and the fitting portion 22 are fitted with each other with such strength that the laminated core 30 can move in the left-right direction (arrow A and direction B in FIG. 1) together with the screw shaft 21, For example, the fitting portion 22 and the through hole 35 may be engaged with each other by rotating the fitting portion 22 after inserting the fitting portion 22 into the through hole 35.

Then, the fitting portion 27 of the rotary shaft 26 is fitted into the through hole 35 on the other end side of the laminated iron core 30 integrated with the screw shaft 21, and the lid moving device 6 is operated. Move the lid 3c in the direction of arrow D to move the case body 3
Fit to a. At this time, the fitting portions 2 are attached to both ends of the through hole 35.
The laminated iron core 30 in which 2 and 27 are fitted also moves at the same time. As a result, the laminated core 30 is mounted in the case 3 (S102).

When the laminated core 30 is mounted, the control device 1
The moving device 4 and the rotating device 5 are operated by the control signal 2 to set the laminated core 30 to the initial position (S103).
To do. As a result, the predetermined groove of the laminated iron core 30, for example, the left end side of the groove 33a is located immediately below the brazing material supply hole 14. In this state, the gas supply device 9 is operated by the control signal of the control device 12, and, for example, argon gas is supplied into the case 3 through the supply valve 16 for a predetermined time (S.
104) Further, the high-frequency current supply device 8 is operated to supply a high-frequency current to the heating coil 7 (S105) and also supply cooling water into the pipe of the heating coil 7.

Then, according to the control signal of the controller 12,
The brazing material supply device 11 is operated to advance the brazing material 10 into the case 3 through the brazing material supply hole 14 (S106),
The tip is brought into contact with the groove 33a of the laminated iron core 30. The brazing material 10 that is in contact with the laminated iron core 30 is melted by the temperature of the laminated iron core 30 that is induction-heated, the left end of the shaft 34a is brazed to the groove 33a, and the pressing plate 31 is also attached.
A and 31b are also brazed.

A predetermined time after the brazing material 10 comes into contact with the groove 33a, the motor 23 of the moving device 4 is rotated at a predetermined rotational speed by a control signal from the control device 12. Motor 2
The rotation of 3 rotates the gear 24, and the screw shaft 21 screwed to the gear 24 also rotates. Screw shaft 2
Rotation of 1 causes the laminated core 30 to move in the direction of arrow A (S
107) In addition, while the laminated core 30 is moving, the rotating shaft 2
6 is simply supported by the connecting member 29 of the rotating device 5,

By the movement of the laminated core 30, the brazing material 1
0 and the contact position of the groove 33a continuously change along the groove 33a, and during this, the brazing material 10 is also continuously fed in a constant amount, and the shaft 34a moves to the groove 33a as shown in FIG. Attached. Then, when the laminated iron core 30 has moved by a predetermined distance, the operation of the moving device 4 is stopped by the control signal of the control device 12, the supply of the brazing material 10 by the brazing material supplying device 11 is temporarily stopped, and the brazing material 10 is further operated. Is retracted for a predetermined distance (S108) and the contact state with the laminated core 30 is released. This completes the brazing of the first groove 33a.

When the brazing of the groove 33a is completed, the rotating device 5 is operated by the control signal of the controller 12. By the operation of the rotating device 5, first, the connecting member 29 chucks the rotating shaft 26, and according to the rotation of the motor 28, the rotating shaft 26, that is, the laminated iron core 30 is rotated by a predetermined angle (S109).
Let This angle is an angle between the adjacent grooves 33a to 33h of the laminated iron core 30, which is preset in the control device 12. As a result, immediately below the brazing material supply hole 14,
The right end of the next groove 33b will be located.

In this state, the brazing material supply device 11 is operated to move the brazing material 10 forward (S110), and after a predetermined time, the moving device 4 is operated to move the laminated iron core 30 in the direction of arrow B in FIG. It is moved (S111). As a result, the shaft 34b is brazed to the groove 33b. Then, when the laminated core 30 returns to the initial position, all the grooves 33a to 33h.
It is determined whether or not the brazing of No. has been completed (S112).
In the case of this embodiment, the result is "NO" and step S10.
Returning to step 6, the grooves 33c and 33d are similarly brazed.
Then, when brazing up to the groove 33h is completed in the same manner, "YES" is determined in step S112, and first, the control signal of the control device 12 stops the supply of the high frequency current (S113) and the supply of the gas. (S11
4) Allow it.

Then, the lid moving device 6 is operated to move the lid 3c (S115), remove it from the case body 3a, cool the laminated iron core 30 by an appropriate method, and then fit the fitting portions 22 and 27. The fitting with the through hole 35 is released, and the laminated iron core 30 is removed (S116). As a result, the step for one laminated core 30 is completed (S117), the motor stator 2 is manufactured, and the next laminated core 30 is mounted while the lid 3c is removed.

As described above, according to the above-described embodiment, the laminated iron core 30 is subjected to the high frequency induction heating in the substantially vacuumed case 3 in which the gas is replaced, so that the shafts 34a to 34h and the groove 33a are formed.
~ 33h, and iron cores 30a, 30b.
Since the a, 31b, 32a, 32b, etc. are brazed, the brazing strength is sufficient, and the motor stator 2 in which the iron cores 30a, 30b ... Are firmly fixed is obtained. In particular, since the laminated iron core 30 is brazed while moving in a horizontal state, the molten brazing material 10 flows evenly along the entire length of the grooves 33a to 33h, and a good brazing state is obtained. As a result, the shafts 34a to 34h do not vibrate during rotation, and a high-quality motor stator 2 can be obtained, which is particularly suitable for use in a motor or the like that requires high rotation.

Further, since the brazing material 10 is brought into contact with the grooves 33a to 33h by the brazing material supply device 11 and the laminated iron core 30 is moved by the moving device 4, the brazing material 10 can be applied to the laminated iron core 30 having a long length. It is possible to obtain the motor stator 2 having the shape of. Further, the plurality of grooves 33a to 33h can be sequentially brazed by moving the laminated iron core 30 by the moving device 4 and rotating it by a predetermined angle by the rotating device 5, and automation of brazing work becomes possible. As a result, work efficiency can be significantly improved by shortening work time.

The shafts 34a to 34h and the groove 33 are also provided.
Since the shapes of a to 33h can be simplified, the manufacturing cost of parts can be reduced, and the case 3 is formed of a quartz tube having a diameter slightly larger than the outer diameter of the motor stator 2, one piece is provided. The amount of inert gas used when manufacturing the motor stator 2 can be reduced. As a result, the device itself can be downsized and the cost can be reduced. In addition, by using a transparent quartz tube as the case 3,
The inside can be visually recognized from the outside, and the brazing work state can be easily grasped.

FIG. 6 is a flow chart showing another embodiment of the manufacturing method according to the present invention, and the feature of this embodiment is that the case 3 is cooled at a predetermined timing. Less than,
The same parts as those in the above flow chart will be described with the same reference numerals. In step 111, move the laminated iron core 30 to
When brazing to the groove 33b is completed, it is determined whether or not the number of brazed grooves 33a to 33h is a predetermined number (S120).
To do. If "NO" in step S120, that is,
If the predetermined number of grooves 33a to 33h are not brazed, the process jumps to step 112.

If "YES" in the step S120, that is, if a predetermined number of grooves 33a to 33h are brazed, a cooling device (not shown) is operated (S12).
1) Let it do. By the operation of this cooling device, for example, the case 3 that is heated to a high temperature due to the heat of brazing by spraying the case 3 with a cooling liquid or a cooling gas or immersing the case 3 in the cooling liquid. Cooling. And case 3
Moves to step 112 after cooling. In this embodiment, since the case 3 is cooled at a predetermined timing, the gas replacement state in the case 3 can be kept the same, and the motor stator 2 with more stable quality can be obtained.

In the above embodiment, the brazing material 10 is used.
Was automatically supplied by the brazing material supply device 11, or the laminated iron core 30 was moved or rotated by the motors 23 and 28, but the present invention is not limited to this.
The brazing material 10 may be supplied or the laminated iron core 30 may be moved and rotated manually. Further, in the above embodiment, the heating coil 7 is configured so as to surround the case 3. However, for example, the horseshoe-shaped heating coil 7 is provided in the case 3
It is possible to use the heating coil 7 having an appropriate configuration, such as being disposed close to only the brazing material supply hole 14 side.

Further, in the above embodiment, case 3 is used.
Is made of a cylindrical quartz tube, it may be made of other non-conductive material such as porcelain and mica, or may be formed in an elliptic cylinder shape or a rectangular cylinder shape. Furthermore, in the above embodiment, the configuration of the motor stator 2, the moving device 4 and the rotating device 5 of the motor stator 2, the lid moving device 6, and the like,
It goes without saying that the cooling method of Case 3 is also an example, and various modifications can be made without departing from the scope of the present invention.

[0036]

As described above in detail, according to the motor stator manufacturing method and the motor manufacturing apparatus of the present invention, since the shaft and the groove are brazed by the high frequency induction heating, each iron core is firmly fixed. A motor stator is obtained and
It is possible to improve work efficiency and the like and reduce the product cost.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of a motor stator manufacturing apparatus according to the present invention.

FIG. 2 is a perspective view of the motor stator.

FIG. 3 is a sectional view of the same main part.

FIG. 4 is an enlarged cross-sectional view of the relevant part.

FIG. 5 is a flowchart showing an example of the manufacturing method.

FIG. 6 is a flowchart showing another embodiment of the manufacturing method.

[Explanation of symbols]

 1 Manufacturing Equipment 2 Motor Stator 3 Case 3a Case Body 3b, 3c Lid 4 Moving Device 5 Rotating Device 6 Lid Moving Device 7 Heating Coil 8 High Frequency Current Supply Device 9 Gas Supply Device 10 Brazing Material 11 Brazing Material Supply Device 12 Control Device 14 Brazing material supply hole 15 Gas supply hole 30 Laminated iron cores 30a, 30b ... Iron cores 33a to 33h Grooves 34a to 34h Shaft

Claims (3)

[Claims] 1. A laminated iron core in which a shaft is fitted in a plurality of axial grooves formed on an outer peripheral surface is set in a non-conductive, substantially sealed case in a substantially horizontal state, and an inert gas is provided in the case. After supplying the heat, a high-frequency current is supplied to a heating coil arranged close to the case to inductively heat the laminated iron core in the case, and the laminated iron core is moved in the axial direction in the case while being arranged in the case. A method of manufacturing a motor stator, characterized in that a brazing material is supplied from a hole to a groove to braze the shaft, and then the laminated core is rotated by a predetermined angle to braze the shaft to the groove in order. 2. A laminated iron core having a shaft fitted in a plurality of axial grooves formed on an outer peripheral surface thereof is set in a non-conductive, substantially sealed case in a substantially horizontal state, and an inert gas is provided in the case. After supplying the heat, a high-frequency current is supplied to a heating coil arranged close to the case to inductively heat the laminated iron core in the case, and the laminated iron core is moved in the axial direction in the case while being arranged in the case. The brazing material is supplied from the hole to the groove to braze the shaft, and then the laminated iron core is rotated by a predetermined angle, and the shaft is sequentially brazed to the groove while cooling the case at a predetermined timing. Motor stator manufacturing method. 3. A moving means for axially moving a laminated iron core, in which a shaft is fitted in a plurality of axial grooves formed on an outer peripheral surface, in a substantially horizontal state in a non-conductive, substantially sealed case. A rotating means for rotating the laminated iron core in the case by a predetermined angle; a current supplying means for supplying a high frequency current to the heating coil arranged close to the case; a gas supplying means for supplying an inert gas in the case; A brazing material supply means for supplying a brazing material into the case from the arranged supply hole, and a manufacturing apparatus for a motor stator.