JP5407195B2 - Induction motor rotor and method of manufacturing the same - Google Patents

Description

  The present invention relates to an induction motor rotor having corrosion resistance and a method of manufacturing the same.

  As an induction motor having corrosion resistance against fluorine contained in laser gas, Patent Document 1 has the following description. That is, in paragraph [0051], “In the displacement sensor target 8c and the electromagnet target 8d, an eddy current loss occurs due to a magnetic field change caused by rotation. In order to reduce this eddy current loss, a thin plate is usually laminated. However, there are problems such as gas accumulation between the laminated thin plates, contamination of the laser gas, and the use of PB permalloy to prevent uniform and highly adherent Ni plating on the laminated surface ... " In paragraph [0058], “the motor rotor 12b of the motor 12 is made of a laminated silicon steel plate and aluminum composite material, so that the surface is coated with a suitable Ni plating as a corrosion-resistant treatment with good adhesion. Therefore, the can 50 is attached to the outer peripheral surface of the motor rotor 12b and fixed to the side plates 51 and 51 by welding or the like , It has been described as ... ".

  Patent Document 2 has the following description. That is, in the paragraph [0007], “... because the rotor is composed of a composite material such as a magnetic steel sheet and an aluminum alloy, the motor rotor is corroded if the transfer gas is corrosive. To prevent this, The rotor surface also needs to be coated with corrosion resistance or coated with a can, however, coating on composite materials such as electromagnetic steel sheets and aluminum alloys is not reliable and the coating film is likely to peel off. Further, the can has a problem that the efficiency becomes worse because the gap between the rotor and the stator is widened.

Patent Document 3 has the following description. That is, in paragraph [0028], "... surface treatment layer 9 (for example, alumite treatment, enamel treatment, electroless nickel plating treatment, chromate treatment, zinc plating treatment, resin on the end ring 1 made of aluminum of the rotor 2) Since the refrigerating machine oil containing the phosphorus-based antiwear agent that promotes corrosion of the aluminum portion and the refrigerant 3 are not in direct contact with the aluminum portion, the electric element that does not cause corrosion of the electric element is provided. A compressor can be provided ... ".
No. 3877912 JP2001-50161 JP-A-9-172759

As described in Patent Document 1, since the laminated surface of the rotor made of laminated steel plates has irregularities, it is difficult to apply corrosion-resistant plating with good adhesion when direct plating is desired.
Further, as described in Patent Documents 1 and 2, as a method of manufacturing a corrosion-resistant rotor, there is a method of covering the rotor with a can made of a separate part made of a corrosion-resistant material. And take time.

In Patent Document 3, the surface treatment layer is formed on the end ring portion of the rotor (rotor), but the surface treatment layer is not formed on the outer peripheral surface of the rotor.
The present invention has been made in view of the above prior art, and provides a rotor for an induction motor having corrosion resistance and a method for manufacturing the same.

A rotor of an induction motor according to claim 1 of the present invention that solves the above-mentioned problem is formed by laminating circular steel plates and having a cylindrical laminated steel plate having slots penetrating in the laminating direction, and filling the slots. In an induction motor rotor comprising a secondary conductor and end rings arranged on both end faces of the laminated steel plate and connected to the secondary conductor, aluminum is formed as the secondary conductor in the slot by die casting, and When forming aluminum as the end ring on both end faces of the laminated steel sheet by die casting, a cylindrical thin film is formed on the outer peripheral face of the laminated steel sheet by die casting , and between the both end faces of the laminated steel sheet and the end ring. Is provided with a corrosion-resistant end plate having a through-hole connecting the secondary conductor and the end ring, and the outer peripheral edge of the end plate is Characterized in that the outer surface flush of the tubular film.

  The rotor of an induction motor according to claim 2 of the present invention for solving the above-mentioned problems is characterized in that, in claim 1, corrosion resistance plating is applied to the thin film surface and the end ring surface.

The rotor of an induction motor according to claim 3 of the present invention that solves the above-described problem is the rotor according to claim 1 , wherein the slot is a closed slot closed with respect to the outer peripheral surface of the laminated steel sheet. A notch for connecting the cylindrical thin film is disposed on the outer periphery of the end plate.

The method for manufacturing a rotor of an induction motor according to claim 4 of the present invention that solves the above-mentioned problem is more preferable than a laminated steel plate together with a cylindrical laminated steel plate having a slot formed by laminating circular steel plates and penetrating in the laminating direction. A corrosion-resistant end plate with a slightly larger diameter is stacked on both end faces of the laminated steel sheet and accommodated in a die-cast mold, and the end space formed between the end plate and the die-cast mold is filled with molten aluminum. Then, while forming the end ring by die casting, filling the slot with molten aluminum through the through hole formed in the end plate and forming the secondary conductor by die casting, the outer peripheral surface of the laminated steel sheet, A gap between the outer peripheral surface formed between the die cast mold and the end plate is filled with molten aluminum to form a cylindrical thin film by die casting.

The method for manufacturing a rotor of an induction motor according to claim 5 of the present invention that solves the above-described problem is the method for manufacturing a rotor of an induction motor according to claim 4 , wherein the slot is an open slot opened to the outer peripheral surface of the laminated steel sheet. The gap between the outer peripheral surfaces is filled with molten aluminum through a slot, and the cylindrical thin film is formed by die casting.

The method for manufacturing a rotor of an induction motor according to claim 6 of the present invention that solves the above-described problem is the method according to claim 4 , wherein, in the case of the closed slot closed with respect to the outer peripheral surface of the laminated steel sheet, the end portion A notch that connects the gap and the gap on the circumferential surface is disposed on the end plate, and through the notch, the gap on the outer circumferential surface is filled with molten aluminum from the edge gap to die the cylindrical thin film. It is formed by casting.

A method for manufacturing a rotor of an induction motor according to claim 7 of the present invention that solves the above-mentioned problem is characterized in that, in claim 4, 5 or 6 , the surface of the cylindrical thin film is processed after being formed by die casting. To do.

The method for manufacturing a rotor of an induction motor according to an eighth aspect of the present invention for solving the above-mentioned problems is characterized in that in the fourth, fifth or sixth aspect , the thin film surface and the end ring surface are subjected to corrosion-resistant plating. It is characterized by.

In the present invention, when the secondary conductor and the end ring are formed by die casting, aluminum is formed by die casting as a cylindrical thin film on the outer peripheral surface of the laminated steel plate, so that the rotor is covered with a can made of another component, etc. A rotor with corrosion resistance can be manufactured with good workability more easily than work.
Moreover, since the unevenness | corrugation on the outer peripheral surface of a laminated steel plate is filled with the cylindrical thin film which consists of aluminum, and the surface of a cylindrical thin film is smooth, corrosion-resistant plating can be performed on it with sufficient adhesiveness.

  Examples 1 and 2 are shown below as the best mode for carrying out the present invention.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the rotor of the induction motor according to this embodiment, FIG. 2 shows the end plate used for the rotor of the induction motor according to this embodiment, and FIG. 3 manufactures the rotor of the induction motor according to this embodiment. It shows the process.

  As shown in FIG. 1, the rotor of the induction motor according to the present embodiment is filled in a cylindrical laminated steel plate 1 formed by laminating circular steel plates and a slot penetrating in the lamination direction of the laminated steel plates 1. A secondary conductor (aluminum bar) 5 and end rings 3 disposed on both end faces of the laminated steel plate 1 via the end plates 2 are provided. Further, aluminum is die-casted as the secondary conductor 5 in the slot of the laminated steel plate 1. When aluminum is formed by die casting as both end rings 3 on both end faces of the laminated steel plate 1 by casting, aluminum is formed by die casting on the outer peripheral surface of the laminated steel plate 1 as a cylindrical thin film 4. .

As shown in FIG. 3 (b), the laminated steel sheet 1 is closed with respect to the outer peripheral surface as shown in FIG. 3 (c) when it has an open slot 1a opened to the outer peripheral surface. There are two ways of having a closed slot 1b.
Accordingly, when the laminated steel sheet 1 has the open lot 1a, as shown in FIG. 1B, the secondary conductor 5 filled in the open lot 1a and the cylindrical thin film formed on the outer peripheral surface of the laminated steel sheet 1 4 is continuously formed by die casting.
When the laminated steel sheet 1 has the closed slot 1b, as shown in FIG. 1C, the secondary conductor 5 filled in the closed slot 1b and the cylindrical thin film formed on the outer peripheral surface of the laminated steel sheet 1 are used. 4 is discontinuous and formed by die casting.

The end plate 2 is made of a corrosion-resistant material (for example, SUS316), has a slightly larger diameter than the laminated steel plate 1, and there is a step between the outer peripheral edge of the end plate 2 and the outer surface of the cylindrical thin film 4. These are not the same.
As the end plate 2, when the laminated steel plate 1 has an open lot 1 a, as shown in FIG. 2A, a slot that connects the secondary conductor 5 filled in the open slot 1 a and the end ring 3. (Through hole) 2a.

Further, as the end plate 2, when the laminated steel plate 1 has the closed slot 1b, as shown in FIG. 2B, the secondary conductor 5 filled in the closed slot 1b and the end ring 3 are connected. In addition to having a slot (through hole) 2a to be formed, the outer peripheral portion further includes a cutout portion 2b for connecting the cylindrical thin film 4 formed on the outer peripheral surface of the laminated steel plate 1 and the end ring 3.
Therefore, when the laminated steel plate 1 has the closed slot 1b, the end ring 3 formed on both end surfaces of the laminated steel plate 1 through the notch 2b of the end plate 2 and the cylindrical shape formed on the outer peripheral surface of the laminated steel plate 1 are used. The thin film 4 is continuously formed by die casting.

Here, as explained in the above-mentioned section of the prior art, the outer peripheral surface of the laminated steel sheet 1 has irregularities, so it is difficult to apply corrosion-resistant plating with good adhesion and is covered with a can made of a corrosion-resistant material. Work was needed.
Moreover, since the thickness of the can is thin (for example, about 0.3 mm), the manufacturing cost is high, and in order to reduce the gap between the can and the laminated steel sheet 1 (for example, about 0.7 mm), Various processes such as the need to turn the surface of the laminated steel sheet 1 and the need to weld the can and the end plate have been increased.

On the other hand, in the present embodiment, when the secondary conductor 5 and the end ring 3 are formed by die casting, the cylindrical thin film 4 is formed by die casting on the outer peripheral surface of the laminated steel plate 1. Since the unevenness is filled with the cylindrical thin film 4 (see FIG. 4C), there is an advantage that the work of covering with a can made of a corrosion-resistant material becomes unnecessary. That is, the step of forming the cylindrical thin film 4 by die casting is included in forming the secondary conductor 5 and the end ring 3 by die casting, and the cylindrical thin film 4 is not formed by die casting as a separate step. There is an advantage that the casting process is completed once and there is no increase in the number of processes.
In particular, when the laminated steel plate 1 is covered with a can, the gap between the laminated steel plate 1 and the can must be provided without a gap between the laminated steel plate 1 and the can. Since the cylindrical thin film 4 is formed of aluminum on the outer peripheral surface of the laminated steel sheet 1 by die-casting, there is an advantage that no gap can exist between the laminated steel sheet 1 and the cylindrical thin film 4.

Since the cylindrical thin film 4 is made of aluminum, it has corrosion resistance by itself. However, when further corrosion resistance is required, the cylindrical thin film 4 is formed on the surface of the cylindrical thin film 4 as shown in Example 2 described later. Corrosion-resistant plating can be applied in layers. Even in that case, since the surface of the cylindrical thin film 4 is smooth, the corrosion-resistant plating can be applied with good adhesion.
The cylindrical thin film 4 is formed by die-casting with a thickness of about 0.5 mm, for example, and after the die-casting, the surface of the cylindrical thin film 4 is post-processed until the required thickness is obtained ( For example, turning may be performed.

Next, a method for manufacturing the rotor of the induction motor according to this embodiment will be described with reference to FIG.
As shown in FIG. 3, together with a cylindrical laminated steel plate 1 formed by laminating circular steel plates, an end plate (for example, SUS316) 2 having a slightly larger diameter than the laminated steel plate 1 is attached to both end surfaces of the laminated steel plate 1. And are accommodated in the die-cast molds 10, 9, and 10.

The die-casting mold 10 has a shape that covers both ends of the laminated steel sheet 1, and an end gap 20 is formed between the end plate 2 and the die-casting mold 10. Has a gate 10a.
The die-cast die 9 has a shape covering the outer peripheral surface of the laminated steel plate 1, and a thin gap 30 on the outer peripheral surface is formed between the outer peripheral surface of the laminated steel plate 1, the die-cast die 9 and the end plate 2.

  And by injecting molten aluminum from the gate 10a of the die-cast mold 10, the end space 20 formed between the end plate 2 and the die-cast mold 10 is filled with molten aluminum, and the end ring is die-cast. While forming, through the through-hole formed in the end plate 2, the slot in the laminated steel plate 1 is filled with molten aluminum, and the secondary conductor is formed by die casting.

Here, as shown in FIG.3 (b), when the laminated steel plate 1 has the open lot 1a, when the molten aluminum is filled into the open lot 1a, the outer peripheral surface of the laminated steel plate 1, the die-cast die 9 and The clearance 30 on the outer peripheral surface formed between the end plates 2 is simultaneously filled with molten aluminum and a cylindrical thin film is formed by die casting.
Moreover, as shown in FIG.3 (c), when the laminated steel plate 1 has the closed slot 1b, the end plate 2 which has arrange | positioned the notch part 2b to an outer peripheral part as shown in FIG.2 (b) is used.

  By using such an end plate 2, when filling the end space 20 formed between the end plate 2 and the die-cast mold 10 with molten aluminum, the notch 2 b formed in the end plate 2. Through the outer peripheral surface of the laminated steel sheet 1, the die cast die 9 and the end plate 2, the outer peripheral surface gap 30 is simultaneously filled with molten aluminum and a cylindrical thin film is formed by die casting. .

Thereafter, by removing the die-cast molds 10, 9, and 10, the rotor of the induction motor of this embodiment having corrosion resistance is manufactured.
Therefore, according to the manufacturing method described above, the die-casting process can be performed only once, there is no increase in the number of processes, and the work of covering with a can made of a corrosion-resistant material is unnecessary as compared with the prior art. There is.

The rotor of the induction motor according to the second embodiment of the present invention will be described with reference to FIG.
In this embodiment, as shown in FIGS. 4A and 4B, a cylindrical laminated steel plate 1 formed by laminating circular steel plates and a slot penetrating in the lamination direction of the laminated steel plates 1 are filled. A secondary conductor (aluminum bar) and end rings 3 arranged on both end faces of the laminated steel plate 1 via the end plates 2 are provided. Further, aluminum as a secondary conductor is die-cast in the slot of the laminated steel plate 1 When aluminum is formed as end rings 3 on both end faces of the laminated steel sheet 1 by die casting, the aluminum film is formed as a cylindrical thin film 4 on the outer peripheral face of the laminated steel sheet 1 by the above-described embodiment. It is common and has the same effect.

  Further, in the present embodiment, a boss 6 made of a corrosion resistant material (for example, SUS316) is inserted into the center hole of the laminated steel sheet 1 from one end side, and a corrosion resistant material (for example, the boss 6 is disposed on the other end side of the laminated steel sheet 1. A fixing tool 7 made of SUS316) is attached (in some cases, welded attachment), and then a corrosion-resistant plating (for example, electroless nickel plating) 8 is applied to the cylindrical thin film 4 and the end ring 3.

Here, since the outer peripheral surface of the laminated steel sheet 1 has irregularities as described in the above-mentioned section of the prior art, it is difficult to perform corrosion-resistant plating with good adhesion.
On the other hand, in this embodiment, as shown in FIG. 4C, the cylindrical thin film 4 is formed by die casting on the outer peripheral surface of the laminated steel plate 1, and the irregularities on the outer peripheral surface of the laminated steel plate 1 are formed by the cylindrical thin film 4. Since the surface of the cylindrical thin film 4 is filled, the corrosion-resistant plating 8 having good adhesion can be applied to the surface of the cylindrical thin film 4.

Moreover, since the cylindrical thin film 4 and the end ring 3 are made of aluminum, they are inherently resistant to corrosion, and furthermore, since the corrosion-resistant plating 8 is layered, they can withstand even more severe corrosive environments. It becomes possible.
Note that the surface of the cylindrical thin film 4 can be post-processed (for example, turning) before the corrosion-resistant plating 8 is applied.

  The present invention can be widely used as a rotor of an induction motor having corrosion resistance, and is particularly suitable as an induction motor used in fluorine gas.

FIG. 1A is a longitudinal sectional view of the rotor of the induction motor according to the first embodiment of the present invention, and FIG. 1B is a view of FIG. 1A in the case of a laminated steel sheet having an open slot. 1A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 1C is a cross-sectional view taken along the line AA in FIG. It is a top view of the end plate used for the rotor of the induction motor which concerns on 1st Example of this invention, Fig.2 (a) is a case where a laminated steel plate is an open slot, FIG.2 (b) is a laminated steel plate closed. This corresponds to the slot case. FIGS. 3A and 3B show a process of manufacturing a rotor for an induction motor according to a first embodiment of the present invention, in which FIG. 3A is a cross-sectional view of the rotor and a die-cast mold, and FIG. FIG. 3C is a plan view of a laminated steel sheet having a closed slot. FIG. 4A is a longitudinal sectional view of the rotor of the induction motor according to the second embodiment of the present invention, FIG. 4B is a BB arrow view in FIG. FIG.4 (c) is an enlarged view of the principal part enclosed with the dashed-dotted line in Fig.4 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated steel plate 1a Open slot 1b Closed slot 2 End plate 2a Slot (through hole)
2b Notch 3 End ring (aluminum)
4 Cylindrical thin film (aluminum)
5 Secondary conductor (aluminum)
6 Boss (corrosion resistant material)
7 Fixture (corrosion resistant material)
8 Corrosion-resistant plating 9,10 Die-cast mold 10a Pouring gate 20 End gap 30 Clearance on outer peripheral surface

Claims (8)

A cylindrical laminated steel plate having a slot formed by laminating circular steel plates and penetrating in the laminating direction, a secondary conductor filled in the slot, and disposed on both end faces of the laminated steel plate, the secondary conductor In a rotor of an induction motor comprising a connecting end ring, when forming aluminum as the secondary conductor in the slot by die casting and forming aluminum as the end ring on both end faces of the laminated steel plate by die casting , A cylindrical thin film is formed by die casting on the outer peripheral surface of the laminated steel sheet ,
Between the both end faces of the laminated steel sheet and the end ring, a corrosion-resistant end plate having a through hole connecting the secondary conductor and the end ring is interposed,
The rotor of an induction motor , wherein an outer peripheral edge of the end plate is flush with an outer surface of the cylindrical thin film . The rotor of an induction motor according to claim 1, wherein the thin film surface and the end ring surface are subjected to corrosion-resistant plating. When the slot is a closed slot closed with respect to the outer peripheral surface of the laminated steel plate, a notch for connecting the end ring and the cylindrical thin film is disposed on the outer periphery of the end plate. The rotor of the induction motor according to 1 . Die-casting a cylindrical laminated steel sheet having a slot formed in a stack of circular steel sheets and having a slot penetrating in the laminating direction, and a corrosion-resistant end plate slightly larger in diameter than the laminated steel sheet on both end surfaces of the laminated steel sheet Through a through-hole formed in the end plate while being housed in a mold, filling an end space formed between the end plate and the die cast mold with molten aluminum and forming an end ring by die casting While the slot is filled with molten aluminum and a secondary conductor is formed by die casting, molten aluminum is applied to the outer peripheral surface of the laminated steel sheet, the gap on the outer peripheral surface formed between the die cast mold and the end plate. A method for manufacturing a rotor of an induction motor, wherein the cylindrical thin film is filled and formed by die casting. When the slot is an open slot opened to the outer peripheral surface of the laminated steel sheet, the cylindrical thin film is formed by die casting by filling molten metal in the gap on the outer peripheral surface through the open slot. The method for manufacturing a rotor for an induction motor according to claim 4 . When the slot is a closed slot closed with respect to the outer peripheral surface of the laminated steel plate, a notch for connecting the end gap and the clearance on the circumferential surface is disposed on the end plate, and through the notch, 5. The method of manufacturing a rotor for an induction motor according to claim 4, wherein the cylindrical thin film is formed by die-casting by filling molten aluminum into the gap on the outer peripheral surface from the end gap. 7. The method of manufacturing a rotor for an induction motor according to claim 4, wherein the surface of the cylindrical thin film is processed after being formed by die casting. 7. The method of manufacturing a rotor for an induction motor according to claim 4 , wherein corrosion-resistant plating is applied to the thin film surface and the end ring surface.

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