JP3274911B2 - Work heating apparatus and motor manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor used for a DC brushless motor in a rotary compressor, for example.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work heating apparatus for heating a work such as a motor, and a method for manufacturing a motor using the rotor.

[0002]

2. Description of the Related Art In a rotary compressor, for example, in order to drive a roller eccentrically in a cylinder to perform a compression operation, an AC motor is provided in a closed case provided with the cylinder and the roller. In this configuration, the data is integrally incorporated.

[0003] The motor used in the rotary compressor includes a shaft which is rotatably held in the hermetically sealed case and has the roller integrally formed at one end thereof, and which is externally fitted to the shaft. And a stator fixed to the closed case side and opposed to the outer peripheral surface of the rotor with a predetermined gap.

In order to manufacture such a motor, it is necessary to fit the rotor onto the shaft. As a method of externally fitting the rotor, a shrink fitting method is widely adopted.

Conventionally, the rotor is shrink-fitted to the shaft by heating the cylindrical rotor from the outer peripheral side.
This is done by fitting the heated rotor to the shaft and then cooling it.

[0006]

In recent years, along with the demand for higher efficiency of the above-mentioned motors, studies have been made to employ a DC brushless motor as a motor used for a rotary compressor. I have.

However, when shrink fitting, which is a method of fixing the rotor to the shaft, is applied to the DC brushless motor, the following problems can be considered. First
In addition, there is a problem in the quality of the motor to be manufactured.

That is, conventionally, in consideration of the easiness of production, a heating heater is opposed to the outer peripheral surface of the rotor to heat the rotor. But D
Unlike the AC motor, the C brushless motor employs a structure in which ferrite, which is a magnetic material, is embedded near the outer peripheral surface of the rotor. Therefore, this row
When the rotor is heated from the outer peripheral side, the outer surface of the ferrite along the radial direction of the rotor is directly heated.

On the other hand, in this case, the inner portion of the rotor is heated by heat from the outer peripheral surface being conducted through the ferrite or a narrow portion where the ferrite is not provided. .

However, the ferrite has a low thermal conductivity, and the portion where the ferrite is not provided is
Due to the very small size, heat may not be easily transmitted to the inner part of the rotor.

Therefore, the inner surface of the ferrite along the radial direction of the rotor is hardly heated, while the outer surface of the ferrite is further heated. That is, since the outer surface of the rotor is extremely heated before the inner surface to be shrink-fitted is sufficiently heated, a sharp temperature difference occurs between the two, and the ferrite cracks due to thermal shock stress. There is. This also means that
It is also conceivable that a crack may occur in the rotor body.

As described above, in the case of the rotary compressor, the motor is a sealed casing of the compressor.
Since the motor will be built in with the other parts in the motor, damage to the motor due to the above-mentioned failure will lead to damage to other parts, and repair of the motor will require disassembly of the entire compressor. Can be troublesome.

Second, in order to solve the above-mentioned problem,
A method of heating the rotor from the inner diameter side of the rotor where no ferrite is located can be considered. According to this method, the outer diameter portion may not be easily heated, contrary to the method described above. However, the inner surface of the ferrite is
Since it is away from the inner peripheral surface of the rotor, it is not directly heated, and a sharp temperature difference between the inner surface and the outer surface of the ferrite rarely occurs.

However, also in this case, if a sharp temperature difference occurs between the inner diameter portion and the outer diameter portion, the rotor may be damaged. Therefore, the heating is
It has to be carried out stepwise according to the heat conduction to the outer peripheral surface side, which may result in poor product productivity.

From the first and second problems, in order to incorporate a DC brushless motor into a rotary compressor,
It can be said that certain problems remain in terms of reliability, productivity, and the like.

The present invention has been made in view of such circumstances, and can prevent the work of a rotor or the like used for a motor from being damaged while heating the work in a short time. (M
It is an object of the present invention to provide a work heating apparatus and a motor manufacturing method capable of improving the reliability and productivity of the motor.

[0017]

According to a first aspect of the present invention, a guided material having an inner diameter portion and an outer diameter portion is embedded inside.
Heats the cylindrical rotor installed on the drive shaft.
Manufacture of motor by shrink fitting
Heating the inner diameter of the rotor,
First step of heating the rotor and the guided material
By heating the outer diameter of the rotor,
And a second step of heating the guided material,
Start and end of the first step and the second step
Start and end almost simultaneously or within a predetermined time from each other
A method for manufacturing a motor, wherein
You.

The second means is the same as the first means,
The start of the second step is longer than the start of the first step.
Motor production characterized in that it is performed after a predetermined time delay
Is the way.

The third means is the first means,
The end of the second step is longer than the end of the first step.
Motor production characterized in that it is performed after a predetermined time delay
Is the way.

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

According to this structure, the work (rotor and magnetic material) can be heated in a short time while preventing the work from being damaged, and the motor can be manufactured. it can.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 3 shows a rotor 1 manufactured according to the present invention.
(Work) is shown. This rotor 1 is shown in FIG.
As shown in FIG. 1, a rotor body 3 is formed by laminating a plurality of circular plates shown in FIG. 2 in the same direction, and a ferrite 4 inserted in the rotor body 3.

That is, the plate 2 is of a disk shape, as shown in the figure, is provided with a circular through hole 2a at the center, and an arc-shaped four at the outer edge along the circumferential direction. Two slits 2b are provided.

When assembling the rotor 1, a plurality of plates 2 are connected to the through holes 2a and the slits 2b.
Are laminated in a state where they are aligned with each other to form the rotor body 3, and then the rotor body 3 is located in the slit 2b located at the outer edge of the rotor body 3 and communicating with the plates 2 in the laminating direction. Ferrite 4 having the same cross section as slit 2b
Insert

At both ends of the rotor body 3 in the laminating direction, a pair of pressing plates 5 and 5 having a through hole 5a in the center are provided, and the rotor plates 3 are laminated on the pair of pressing plates 5 and 5 as described above. By fixing one end and the other end of the positioning pins 6 penetrating the plurality of plates 2..., The plurality of plates 2.

As shown in FIG. 1B, the rotor 1 thus formed has a cylindrical work (rotor 1) having an inner diameter portion 1a and an outer diameter portion 1b. Constitute. The rotor 1 is attached to a shaft indicated by reference numeral 7 by shrink fitting.

Next, a heating device for heating the rotor 1 in order to shrink-fit the rotor 1 will be described with reference to FIG. In FIG. 1, reference numeral 10 denotes a base of the apparatus. The base 10 is provided with a gantry 10 provided with the upper surface being substantially horizontal.
a, and a wall portion 10 standing substantially vertically from the gantry portion 10.
b.

A guide body 12 for guiding a guide post shown in FIG. 11 in a vertically slidable manner is provided in a gantry portion 10a of the base 10, and a drive shaft 13a is provided on both sides of the guide body 12 so as to sandwich the guide body 12. 2 extended upward
The two vertical drive cylinders 13 are fixed.

The upper end of the guide post 11 and the above 2
At the upper end of the drive shaft 13a of the two vertical drive cylinders 13,
The fixing plate 14 is fixed substantially horizontally. That is, the fixed plate 14 is driven up and down while being guided in the up and down direction by the guide post 11 by the operation of the up and down drive cylinder 13.

On the fixed plate 14, a disk-shaped support 16 for supporting the rotor 1 is provided. At the upper end of the support 16, a first stepped surface 16a for holding one axial end surface of the rotor 1 and the first stepped surface 16a
A second step surface 16b having an inner diameter slightly larger than the inner diameter portion 1a of the rotor 1 is recessed in the center of the rotor.

On the other hand, a heating section 18 for heating the rotor 1 held by the support is provided above the support 16. The heating section 18 has a first heater 1 having an outer diameter smaller than the inner diameter section 1a of the rotor 1.
9 and a cylindrical second heater having an inner diameter slightly larger than the outer diameter portion 1b of the rotor 1 and provided with the center axis of the first heater 19 coincident with the center axis thereof. 20.

The first heater 19 is a first heater.
A first high-frequency coil 22 is embedded in the first heater 19 while being fixed to the wall 10b via a first bracket 21 attached to an upper end of the heater 19,
The first high-frequency coil 22 is connected to the first matching device 23 provided in the wall 10b via the first bracket 21.

On the other hand, the second heater 20
Second bracket 2 attached to the upper end of heater 20
5 and a second high-frequency coil 26 is buried in the second heater 20 while being fixed to the wall 10b. 25 is connected to a second matching device 27 provided in the wall portion 10b.

The first and second matching devices 23 and 27 are connected to first and second high-frequency power supplies 28 and 29, respectively.
The first and second high-frequency power supplies 28 and 29 are connected to a control unit indicated by 30 in FIG. Therefore, the first and second high-frequency coils 22 and 26 provided in the first and second heaters 19 and 20 are connected to the first and second high-frequency power sources by a command from the control unit 30. 28 and 29 are operated to generate a high frequency, and the above-mentioned low
The heater 1 can be heated (high-frequency heating).

On the outside of the second heater 20,
A temperature sensor 32 for detecting the surface temperature of the outer diameter portion of the rotor 1 in a non-contact manner is provided. This temperature sensor 32
Is connected to the control unit 30. The control unit 30 measures the surface temperature of the outer diameter portion 1b of the rotor 1 based on the temperature detection signal of the temperature sensor 32.

Each coil 22, 26, matching device 23,
27 and the high frequency power supplies 28 and 29
4 are connected. When the heating unit 18 starts operating, the cooling unit 24 controls each coil 22, 2
6. It has a function of circulating cooling water through the matching unit 23 and the high frequency power supplies 28 and 29 and cooling them.

Further, the control section 30 issues a command to a hydraulic pressure switching valve 31 for operating the vertical cylinder 13. The hydraulic switching valve 31 is provided in the control unit 3.
0, the upper and lower cylinders 13
Thus, the support 16 is moved up and down.

Next, a method of heating the rotor 1 using this apparatus will be described. The rotor 1 assembled as described above is mounted on the support 16 with its axis substantially perpendicular as shown in FIG. This rotor 1
Is positioned on the first step surface 16a provided on the support body 16 so that the center is positioned and held in that state.

Next, the control unit 30 operates the vertical cylinder 13 to raise the support 16, thereby inserting the rotor 1 into the heating unit 18. As a result, as shown in FIG.
The first heating heater 19 is inserted into the inside,
A second heater 20 is provided at b.

Next, the control unit 30 operates the first and second high-frequency power supplies 28 and 29 in this order, and controls the first and second high-frequency power supplies 28 and 29 in the first and second heaters 19 and 20. Second
A high-frequency voltage is applied to the high-frequency coils 22 and 26. As a result, the inner diameter portion 1a and the outer diameter portion 1b of the rotor 1 are formed.
Is covered with high frequency, so that the rotor 1 is heated by high frequency from the inner diameter portion 1a and the outer diameter portion 1b.

Next, a method of controlling the first and second heaters 19 and 20 (high-frequency coil) by the control unit 30 will be described in detail. The control unit 30 controls the first coil 22 to have an oscillating frequency of 180 to 200 KHz in order to prevent frequency interference from occurring between the first and second coils 22 and 26, The oscillation frequency of the second coil 26 is controlled to 10 to 40 KHz.

The reason why the oscillation frequency of the first coil 22 is set higher than the oscillation frequency of the second coil 26 is that the inner diameter portion 1a of the rotor 1 is more efficient than the outer diameter portion 1b. It is for heating well.

The control unit 30 has a timer function, and controls the time for applying the high-frequency voltage from the first and second high-frequency power supplies 28 and 29 to the first and second coils 22 and 26. Are respectively controlled.

The following is a description based on the graph shown in FIG. First, the control unit 30 activates the first high-frequency power supply 28 (heating amount 18 KW) connected to the first coil 22 to start heating the inner diameter portion 1a of the rotor 1. As a result, the temperature of the inner diameter portion 1a of the rotor 1 becomes
The temperature is raised as shown by the solid line (a) in FIG.

When a preset time A has elapsed from the start of the operation of the first high-frequency power supply 22, the control unit 30 controls the second high-frequency power supply 29 (heater) connected to the second coil 26. Actuate a quantity of 4 KW). As a result, the temperature of the outer diameter portion 1b of the rotor 1 starts to rise as shown by a dotted line (b) in FIG.

When the temperature of the inner diameter portion 1a of the rotor 1 is increased (solid line (a)), the temperature of the inner surface of the ferrite 4 is changed by a dashed line (c) in FIG. The temperature is raised as indicated by.

On the other hand, the conduction heat from the outer diameter portion 1b is hindered by the ferrite 4 and is hardly transmitted to the inside of the rotor 1, and the thermal conductivity of the ferrite 4 is low. Therefore, most of the conduction heat from the outer diameter portion 1b is used for heating the outer surface of the ferrite 4, and the temperature of the outer surface of the ferrite 4 is outside the rotor 1 indicated by a dotted line (b) in FIG. It becomes substantially equal to the temperature of the diameter portion 1a.

Next, when a predetermined time (for example, 60 seconds) has elapsed from the start of the operation of the first high-frequency power supply 28, the control unit 30 stops the operation of the first high-frequency power supply 28. .

When a predetermined time B has elapsed from the stop of the first high-frequency power supply 28, the control section 30 stops the operation of the second high-frequency power supply 29.

As a result, the heating of the outer diameter portion 1b and the inner diameter portion 1a of the rotor 1 is stopped, and the temperatures of the inner diameter portion 1a and the outer diameter portion 1a gradually decrease (solid line shown in the figure). (A) and the dotted line (b) show that the temperature of the inner surface of the ferrite 4 rises due to the residual heat (dashed line (c)), and after a lapse of a predetermined time (for example, 180 seconds), the inner diameter of the rotor 1 is reduced. The temperature of the outer surface 1a, the outer diameter portion 1b, and the inner surface of the ferrite 4 converge around a predetermined desired heating temperature (for example, 200 ° C.), and the temperature in the rotor 1 becomes substantially uniform.

The rotor 1 thus heated is
After being fitted to the shaft 7 shown in FIG. 3, it is cooled and shrink-fitted and fixed to the shaft 7. The control unit 30 monitors the surface temperature of the outer diameter portion 1b of the rotor 1 using the temperature sensor 32. If the temperature of the outer diameter portion 1b becomes too high, Even before the predetermined time B elapses, the second high-frequency power supply 2
The operation of No. 9 is terminated, and the heating of the outer diameter portion 1b is terminated.

Next, the roll shrink-fitted in this manner is used.
The structure and assembly of a rotary compressor using the rotor 1 and the shaft 7 will be described. FIG. 4 is a longitudinal sectional view of the rotary compressor 35.

The rotary compressor 35 has a closed case 36. In the lower part of this closed case 36,
A compression mechanism 38 having two cylinders 37, 37 is provided. A DC brushless motor 39 is provided above the closed case 36.

The DC brushless motor 39 comprises a stator 40 fixed to the inner surface of the closed casing 36 and the rotor 1 disposed inside the stator 40. ing. The rotor 1 is shrink-fitted to a shaft 7 (crankshaft).

The lower part of the shaft 7 is
Two cylinders 37, 3 arranged in a pair at the top and bottom
7, two crank portions 7a, 7a formed with a phase difference of about 180 ° are located in the cylinder 37.

The shaft 7 has a pair of bearing members 42, 4 for closing and fixing the two cylinders 37.
3 rotatably supported. The two cylinders 37 fixed by the bearing members 42 and 43 are fixed to the closed casing 36 by a sheet metal frame shown in FIG.

A cylindrical roller 45 is fitted on each of the two crank portions 7a, 7a. Therefore, the cylinder 37 is vertically divided by the partition plate 41 and the bearing members 42 and 43, and has a crescent shape between its inner peripheral surface and the outer peripheral surface of the eccentric roller 45 attached to the crank portion 7a. (Not shown) compression space 46
Is composed.

In the cylinder 37, a brake (not shown) that partitions the compression space 46 into a high pressure side and a low pressure side.
Is provided. The blade is urged toward the roller 45 by a spring member or the like. The blade enters and exits a blade groove provided in the cylinder 37, and the tip of the blade always contacts the roller 45. ing.

Further, a suction passage 48 is formed in each of the cylinders 37, and one end of the suction passage 48 is provided with the above-mentioned closed casing.
It is connected to a gas-liquid separator 49 provided outside the source. Next, the operation of the rotary compressor will be described.

When the DC brushless motor 39 is operated, the shaft 7 rotates, whereby the roller 45 performs eccentric rotation in the cylinder 37. Thus, the refrigerant sucked into the compression space from the suction passage 48 is compressed according to the eccentric rotation of the roller 45.

Next, the assembly of the rotary compressor 35 will be described. Before shrink-fitting the rotor 1 on the shaft 7, a compression mechanism 38 comprising the cylinder 37 and the bearing members 42, 43 and the like is first assembled to the lower end of the shaft 7. After the compression mechanism 38 is assembled to the lower end of the shaft 7, the heated rotor 1 is fitted to the upper end of the shaft 7 and then cooled to shrink-fit.

Next, the ferrite 4 embedded in the rotor
Then, the assembled compression mechanism 38, shaft 7 and rotor 1 are inserted into the case 36, and fixed in the case 36 by the sheet metal frame 44. Next, the rotary compressor 35 having the DC brushless motor 39 built therein can be manufactured by fixing the stator 40 in the case 36 and assembling various other components.

According to such a configuration, the following effects can be obtained. The graph shown in FIG. 6 shows the technique described in the section of the prior art, that is, the inner diameter portion 1a, the outer diameter portion 1b, and the ferrite 4 of the rotor 1 when the rotor 1 is heated only from the inner diameter portion 1a side. 5 is a graph showing a rise in the temperature of the inner surface of FIG. The graph shown in FIG. 7 shows the temperature rise of the inner surface of the ferrite 4 and the inner and outer diameter portions 1a and 1b of the rotor 1 when the rotor 1 is intermittently heated only from the inner diameter portion 1a side. It is a graph.

First, as shown in the graph of FIG.
When heating is performed only from the side a (heating amount 18 KW), a considerable temperature difference ΔT between the surface temperature of the outer diameter portion 1 b of the rotor 1, that is, the temperature of the outer surface of the ferrite 4 and the temperature of the inner surface of the ferrite 4. Occurs. Therefore, the ferrite 4 may be damaged by a thermal shock, such as a crack.

On the other hand, the graph of FIG. 7 shows the inner diameter portion 1 of the rotor 1 in order to prevent such damage due to thermal shock.
When the heating is performed intermittently from the b side (heating amount is 8
KW). In this case, the difference ΔT between the temperature of the inner surface of the ferrite 4 and the temperature of the outer surface thereof (the temperature of the outer diameter portion 1b of the rotor 1) can be reduced. For this purpose, as shown in FIG. Heating of the inner diameter portion 1a of the rotor 1 must be carried out intermittently and gradually progressed, and it takes time to raise the rotor 1 to a predetermined temperature, resulting in poor productivity. There is that.

On the other hand, in the present invention (FIG. 5), the inner and outer surfaces of the rotor 1 are heated by heating from both the inner side 1a and the outer side 1b, and the inner side 1a is heated.
Since the heating amount on the side is increased, the temperature difference between the inner and outer surfaces of the ferrite 4 can be reduced, and damage can be prevented. .

It takes a certain time for the inner surface of the ferrite 4 to rise in temperature by conduction heat from the inner diameter portion 1a side of the rotor 1, while the outer surface of the ferrite 4 has the outer diameter portion 1b. The temperature rises without any time delay by heating.
Therefore, the start of heating the outer diameter portion 1b of the rotor 1 is delayed by a predetermined time A from the start of heating of the inner diameter portion 1a, so that the temperature difference between the inner surface and the outer surface of the ferrite 4 is further increased. Can be reduced.

Further, the oscillation frequency of the first coil 22 is set higher than the oscillation frequency of the second coil 26, so that the inner diameter portion 1a of the rotor 1 can be efficiently heated.

Also, at the end of heating, the end of heating of the outer diameter portion 1b is delayed by a predetermined time B in consideration of the difference in the heat conduction time. As a result, the temperature difference ΔT between the inner surface and the outer surface of the ferrite 4 can be reduced as much as possible, so that the ferrite 4 can be effectively prevented from being damaged by a thermal shock, and the entire rotor 1 can be fixed in a short time. Temperature.

Further, since the oscillation frequency of the first coil 22 and the oscillation frequency of the second coil 26 are made different, no frequency interference occurs between the two.
As a result, a part of the rotor 1 is locally heated,
It can be effectively prevented from not being heated, and the entire rotor 1 can be heated substantially uniformly.

With these facts, the more reliable D
It becomes possible to manufacture a C brushless motor. In particular, the use of the DC brushless motor 39 for the rotary compressor 35 has been studied.
Since the DC brushless motor 39 is integrated with a plurality of parts as described above, if the rotor is damaged, the entire compressor must be disassembled, and repair is troublesome and costly. May be higher. In addition, there is a possibility that other parts in the sealing case 36 may be damaged.

However, according to the present invention, such a problem is solved and the DC brushless motor 39 having a high performance can be easily incorporated in a highly reliable state. There is an effect that a high rotary compressor can be realized.

The present invention is not limited to the above embodiment, but can be variously modified without changing the gist of the invention. In the above embodiment, the rotor 1 is heated by high-frequency heating. However, the present invention is not limited to this, and other heating means may be used.

In the above embodiment, the rotor 1 is used as the work, but the present invention is not limited to this. Any other cylindrical work that can be shrink-fitted may be used.

Further, in the embodiment, as shown in FIG. 2, the rotor 1 is moved to
Although the rotor 1 is inserted into the heating unit 18, the invention is not limited to this. The rotor 1 may be inserted into the heating unit 18 by driving the heating unit 18. .

[0081]

As described above, the first structure of the present invention has an inner diameter portion and an outer diameter portion, and has a guided material inside.
Heating the embedded cylindrical rotor, drive shaft
Manufacturing of a motor by shrink-fitting to a motor
Heating the inner diameter of the rotor in the manufacturing method
And a first heater for heating the rotor and the guided material.
This step is performed by heating the outer diameter portion of the rotor.
And a second step of heating the guided material.
The start and end of the first step and the second step
Start and end at the same time or at a predetermined time
A method of manufacturing a motor characterized in that the motor is shifted.
is there.

The second configuration is different from the first configuration in that
The start of the second step is longer than the start of the first step.
Motor production characterized in that it is performed after a predetermined time delay
Is the way.

The third configuration is different from the first configuration in that
The end of the second step is longer than the end of the first step.
Motor production characterized in that it is performed after a predetermined time delay
Is the way.

The fifth configuration is different from the fourth configuration in that
The start of the second step is a motor manufacturing method which is performed with a predetermined time delay from the start of the first step. Sixth
The method of the fourth aspect is a method for manufacturing a motor, wherein the end of the second step is delayed by a predetermined time from the end of the first step in the fourth aspect.

The seventh configuration is different from the second configuration in that
The first and second steps are a method for manufacturing a motor in which the inner diameter or the outer diameter of the rotor is heated by high-frequency heating means.

The eighth configuration is the same as the seventh configuration, except that
This is a motor manufacturing method wherein the oscillation frequency of the high-frequency heating means in the first step and the oscillation frequency of the high-frequency heating means in the second step are different from each other.

The ninth configuration is the same as the eighth configuration, except that
This is a method for manufacturing a motor, wherein the oscillation frequency of the high-frequency heating means in the first step is higher than the oscillation frequency of the high-frequency heating means in the second step.

According to this structure, the work such as a rotor shrink-fitted to the shaft of the motor can be heated in a short time while preventing the work from being damaged. ) Has the effect of improving the reliability and productivity.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing the operation.

FIG. 3 (a) is an exploded perspective view showing a rotor,
(B) is a longitudinal sectional view similarly.

FIG. 4 is a longitudinal sectional view showing a rotary compressor.

FIG. 5 is a graph showing temperature rises of the rotor and the ferrite.

FIG. 6 is a graph showing a temperature rise of a rotor and ferrite in a conventional example.

FIG. 7 is a graph showing temperature rises of a rotor and ferrite in a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotor (cylindrical work), 1a ... Inner diameter part, 1b ...
Outer diameter part, 4 ... Ferrite (magnetic material), 7 ... Shaft (drive shaft), 16 ... Support (work holding part), 1
2 ... vertical drive cylinder (drive mechanism), 22 ... first coil (first high frequency heating heater, high frequency heating means), 26
... Second coil (second high-frequency heating heater, high-frequency heating means), 39 DC brushless motor (motor)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05B 6/10 H05B 6/44 H02K 1/27 H02K 1/28 C21D 1/10

Claims (3)

(57) [Claims] An inner diameter portion and an outer diameter portion which are guided inside;
The cylindrical rotor in which the material is buried is heated to drive the rotor.
A motor for manufacturing a motor by shrink-fitting into a shaft
In the method of manufacturing the rotor, the inner diameter of the rotor is heated so that the rotor and the rotor are heated.
And a first step of heating the guided material, and heating the outer diameter portion of the rotor to form the rotor and the rotor.
And a second step of heating the guided material, wherein the start and end of the first step and the second step
Start and end almost simultaneously or within a predetermined time from each other
A method for manufacturing a motor, characterized in that the method is performed. 2. A method for manufacturing a motor according to claim 1.
Thus, the start of the second step is longer than the start of the first step.
Motor production characterized in that it is performed after a predetermined time delay
Method. 3. A method for manufacturing a motor according to claim 1.
Thus, the end of the second step is longer than the end of the first step.
Motor production characterized in that it is performed after a predetermined time delay
Method.