Iron core, rotating electrical machine, and stationary device

Abstract

The iron core (11, 21) includes a laminate (12, 22) composed of a plurality of electromagnetic steel sheets stacked with each other. The laminate (12, 22) has a contact region (C) formed between a pair of adjacent electromagnetic steel sheets among the plurality of electromagnetic steel sheets. The contact region (C) has a first friction region (F1) and a second friction region (F2) having different friction coefficients from each other.

Description

Technical Field

[0001] This disclosure relates to an iron core, rotating electromechanical equipment, and a stationary device. Background Technology

[0002] Rotating electrical machinery such as electric motors and generators are known from the past. Patent Document 1 discloses an electric motor comprising a stator and a rotor. The stator of Patent Document 1 includes a stator core, and the rotor includes a rotor core. An air gap is formed between the stator core and the rotor core of the electric motor in Patent Document 1.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2019-180160 Summary of the Invention

[0006] -The technical problem the invention aims to solve-

[0007] In the electric motor described in Patent Document 1, an electromagnetic force acts on the air gap, thereby generating a rotational force. Sometimes, the stator and rotor cores vibrate due to the electromagnetic force acting on the air gap. When the core vibrates, this vibration can sometimes be transmitted to the holding components that hold the core, causing the holding components to vibrate and generate noise.

[0008] The purpose of this disclosure is to suppress vibration of the iron core.

[0009] - Technical solutions used to solve technical problems -

[0010] The first aspect of this disclosure is an iron core, characterized in that:

[0011] Includes laminates 12 and 22 composed of multiple electromagnetic steel plates stacked on top of each other.

[0012] The laminates 12 and 22 have contact areas C, which are formed between adjacent pairs of electromagnetic steel plates.

[0013] The contact area C has a first friction area F1 and a second friction area F2 with different coefficients of friction.

[0014] In the first aspect, a first friction region F1 and a second friction region F2 with different friction coefficients can be configured in the parts where the vibration amounts are different when a pair of electromagnetic steel plates are excited, so as to obtain a damping effect. In this way, the vibration of iron cores 11 and 21 can be suppressed.

[0015] The second aspect of this disclosure is that, based on the iron cores 11 and 21 of the first aspect, it is characterized by:

[0016] The pair of electromagnetic steel plates have a first vibrating part V1 and a second vibrating part V2. When the first vibrating part V1 is excited, it reaches a predetermined vibration amount, and the vibration amount of the second vibrating part V2 is greater than that of the first vibrating part V1.

[0017] The first friction region F1 is formed in the first vibration part V1

[0018] The second friction region F2 is formed in the second vibration part V2.

[0019] The coefficient of friction of the second friction region F2 is less than the coefficient of friction of the first friction region F1.

[0020] In the second aspect, a second friction region F2, whose friction coefficient is less than that of the first friction region F1, is formed in the second vibration region V2, whose vibration magnitude is greater than that of the first vibration region V1. This further attenuates the vibration of the pair of electromagnetic steel plates.

[0021] The third aspect of this disclosure is that, based on the first or second aspect, the iron cores 11 and 21 are characterized in that:

[0022] The iron cores 11 and 21 also include fastening parts 13 for securing the pair of electromagnetic steel plates.

[0023] The first friction area F1 is located closer to the fastening part 13 than the second friction area F2.

[0024] The coefficient of friction of the second friction region F2 is less than the coefficient of friction of the first friction region F1.

[0025] In the third aspect, the vibration of the pair of electromagnetic steel plates is less in the portion near the fastener 13 than in the portion farther from the fastener 13. The first friction region F1 is located closer to the fastener 13 than the second friction region F2, thus further attenuating the vibration of the pair of electromagnetic steel plates.

[0026] The fourth aspect of this disclosure is that, based on the iron cores 11 and 21 of any one of the first to third aspects, it is characterized by:

[0027] The laminates 12 and 22 are held by holding components 4 and 2a.

[0028] The distance between the second friction region F2 and the retaining components 4 and 2a is longer than the distance between the first friction region F1 and the retaining components 4 and 2a.

[0029] The coefficient of friction of the second friction region F2 is less than the coefficient of friction of the first friction region F1.

[0030] In the fourth aspect, the vibration of the pair of electromagnets is greater in the portion away from the retaining components 4 and 2a than near the retaining components 4 and 2a. The distance between the second friction region F2 and the retaining components 4 and 2a is longer than the distance between the first friction region F1 and the retaining components 4 and 2a, thus further attenuating the vibration of the pair of electromagnets.

[0031] The fifth aspect of this disclosure is that, based on the iron cores 11 and 21 of any one of the first to fourth aspects, it is characterized by:

[0032] A surface component 30 is provided on the surface of at least one of the pair of electromagnetic steel plates.

[0033] At least one of the first friction region F1 and the second friction region F2 is formed on the surface component 30.

[0034] In the fifth aspect, at least one of the first friction region F1 and the second friction region F2 is formed on the surface component 30, thereby enabling the change of the friction coefficient of the first friction region F1 and the second friction region F2.

[0035] The sixth aspect of this disclosure is that, based on the iron cores 11 and 21 of any one of the first to fifth aspects, it is characterized by:

[0036] The first friction region F1 and the second friction region F2 of the pair of electromagnetic steel plates have different surface roughness.

[0037] In the sixth aspect, the surface roughness of the first friction region F1 and the second friction region F2 are different from each other, thereby changing the friction coefficient of the first friction region F1 and the second friction region F2.

[0038] The seventh aspect of this disclosure is a rotating electromechanical device, characterized in that it comprises an iron core 11, 21 including any one of the first to sixth aspects.

[0039] The eighth aspect of this disclosure is a stationary device, characterized in that: it comprises an iron core 11, 21 including any one of the first to sixth aspects. Attached Figure Description

[0040] Figure 1 This is a longitudinal sectional view of the compressor in the embodiment.

[0041] Figure 2 It is a magnified cross-sectional view of the periphery of the fastening part of the stator core.

[0042] Figure 3 This is a magnified cross-sectional view of the vicinity of the shell in the stator core of Modified Example 1. Detailed Implementation

[0043] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the following embodiments are essentially preferred examples and are not intended to limit the scope of the invention, its application, or its uses.

[0044] (Implementation Method)

[0045] The implementation method is described below. Figure 1 A compressor 1 according to a first embodiment is shown. Compressor 1 is, for example, installed in the refrigerant circuit of an air conditioning unit (not shown). Compressor 1 compresses the refrigerant in the refrigerant circuit. Figure 1 As shown, compressor 1 includes electric motor 2, compression mechanism 3 and housing 4.

[0046] The housing 4 is a container for housing the compression mechanism 3 and the electric motor 2. The housing 4 is also a retaining component for holding the stator 10 of the electric motor 2.

[0047] Shell 4 is a sealed container. Shell 4 is made of metal such as iron. Shell 4 is formed, for example, by performing a so-called roll forming process on a metal sheet (such as iron) to form a cylindrical component, and welding end plates (such as iron) to both ends of the cylindrical component.

[0048] The compression mechanism 3 compresses the fluid (refrigerant in this example). The compression mechanism 3 can be various types of fluid machinery. For example, it can be a rotary compressor, a scroll compressor, etc. In this example, the compression mechanism 3 draws in fluid through a suction pipe 3a provided on the side of the housing 4 and ejects the compressed fluid into the housing 4. The fluid (refrigerant) ejected into the housing 4 is then ejected through a discharge pipe 3b.

[0049] -Structure of an electric motor-

[0050] Electric motor 2 is an example of rotating electromechanical equipment. Electric motor 2 drives compression mechanism 3. Electric motor 2 is a magnet-embedded rotating electromechanical equipment. Electric motor 2 includes stator 10, rotor 20 and rotating shaft 2a.

[0051] The rotating shaft 2a is a holding component that holds the rotor 20. The rotating shaft 2a is made of a metal such as iron. The rotating shaft 2a is also connected to the compression mechanism 3.

[0052] In the following description, axial direction refers to the direction of the centerline of the rotation axis 2a. Radial direction refers to the direction orthogonal to the axial direction. Circumferential direction refers to the direction extending along a circle with the centerline of the rotation axis 2a as the center.

[0053] <Rotor>

[0054] The rotor 20 includes a rotor core 21 and a permanent magnet (not shown). The permanent magnet is housed in a through hole formed in the rotor core 21.

[0055] The rotor core 21 has a laminated body 22. The laminated body 22 is a cylindrical component. The laminated body 22 is composed of multiple plate components (hereinafter referred to as rotor plates 23) stacked axially. The rotor core 21 is a so-called laminated core.

[0056] The rotor plate 23 is made of electromagnetic steel sheet. The rotor plate 23 is manufactured, for example, by stamping the electromagnetic steel sheet. An insulating protective film is applied to the rotor plate 23. During the manufacture of the rotor core 21, the rotor plates 23 are fixed to each other, for example, by riveting. A through hole for inserting the rotating shaft 2a is formed in the center of the rotor plate 23.

[0057] <stator>

[0058] The stator 10 includes a stator core 11 and coils 16. The stator core 11 corresponds to the core of this disclosure. The stator core 11 has a laminated body 12 and a fastening portion 13. The laminated body 12 is a cylindrical component. The laminated body 12 is constructed by axially stacking multiple plate components (hereinafter referred to as stator plates 17). In other words, the stacking direction of the stator plates 17 is approximately parallel to the axial direction. The stator core 11 is a so-called laminated core.

[0059] The stator plate 17 is made of electromagnet steel sheet. The stator plate 17 is manufactured, for example, by stamping the electromagnet steel sheet. An insulating protective film is applied to the stator plate 17. During the manufacture of the stator core 11, the stator plates 17 are fastened together by bolts. In this example, the bolt is a fastening part 13. The fastening part 13 fastens a pair of adjacent electromagnet steel plates. The stator plates 17 can also be fastened together by riveting or welding.

[0060] like Figure 2 As shown, the laminate 12 has multiple contact areas C. Each contact area C is formed between an adjacent pair of stator plates 17, 17 in the laminate 12. In other words, each contact area C is formed between an adjacent pair of electromagnetic steel plates.

[0061] The contact area C comprises a direct contact area D and multiple friction areas F1 and F2. The direct contact area D is the region where a pair of adjacent stator plates 17, 17 directly contact each other. Friction areas F1 and F2 are regions where the coefficient of friction changes relative to the direct contact area D. The coefficients of friction for the multiple friction areas F1 and F2 are not equal. The coefficients of friction referred to here include both static and kinetic friction coefficients.

[0062] Multiple friction regions F1 and F2 include the first friction region F1 and the second friction region F2. It should be noted that the coefficients of friction for each friction region F1 and F2 were measured according to JIS K7125:1999.

[0063] The first friction region F1 is disposed around the fastening part 13. In this example, the first friction region F1 is formed such that it is spaced apart from the fastening part 13 by a predetermined interval and surrounds the fastening part 13.

[0064] The second friction region F2 is further away from the fastener 13 than the first friction region F1. Here, the shortest distance between the fastener 13 and the first friction region F1 is defined as the first distance L1, and the shortest distance between the fastener 13 and the second friction region F2 is defined as the second distance L2. The second distance L2 is longer than the first distance L1 (L1 < L2). In other words, the first friction region F1 is located closer to the fastener 13 than the second friction region F2.

[0065] The first friction region is formed into an annular shape with a width (radial length) of d1. The second friction region F2 is formed into a strip with a width of d2. In this example, the widths d1 of the first friction regions F1 provided in each contact region C are equal. The widths d2 of the second friction regions F2 provided in each contact region C are also equal. Multiple first friction regions F1 and second friction regions F2 are stacked in the stacking direction.

[0066] A surface member 30 is provided on the surface of one of a pair of stator plates 17, 17. In this example, a first surface member 31 and a second surface member 32 are provided on the surface of the lower stator plate 17 of the pair of stator plates 17, 17. The first surface member 31 is made of rubber. The second surface member 32 is made of resin. A first friction region F1 is formed between the first surface member 31 and the stator plate 17. A second friction region F2 is formed between the second surface member 32 and the stator plate 17. The coefficient of friction μ2 of the second friction region F2 is less than the coefficient of friction μ1 of the first friction region F1 (μ1 > μ2).

[0067] However, when the motor is operating, electromagnetic force acts on the gap (so-called air gap) formed between the stator 10 and the rotor 20. This electromagnetic force excites the laminate 12. When the laminate 12 is excited, a pair of adjacent stator plates 17, 17 vibrate. Multiple friction regions F1, F2 with unequal coefficients of friction are formed within a contact area C. Therefore, when the pair of stator plates 17, 17 vibrates, the shear direction movement of the portions forming each friction region F1, F2 in the pair of stator plates 17, 17 is unequal.

[0068] Specifically, the friction coefficient μ2 of the second friction region F2 is less than the friction coefficient μ1 of the first friction region F1 (μ1 > μ2). Therefore, in the first friction region F1, the stator plate 17 is not easy to move relative to the first surface component 31 in the shear direction, while in the second friction region F2, the stator plate 17 is easy to move relative to the second surface component 32 in the shear direction.

[0069] Here, when the laminate 12 vibrates, a pair of adjacent stator plates 17, 17 vibrate with a predetermined amount of vibration around the periphery of the fastening part 13. In the portion of the stator plates 17 that is away from the fastening part 13 relative to the periphery of the fastening part 13, the stator plates 17 are not fixed to each other, and therefore vibrate with an amount of vibration greater than that of the first vibrating part V1.

[0070] The periphery of the fastening part 13, which vibrates with a predetermined amount of vibration, is designated as the first vibration part V1, and the portion that vibrates away from the fastening part 13 with a vibration amount greater than that of the first vibration part V1 is designated as the second vibration part V2. At this time, a first friction region F1 is formed in the first vibration part V1, and a second friction region F2 is formed in the second vibration part V2.

[0071] The friction coefficient of the second vibration part V2, which vibrates with a greater vibration amount than the first vibration part V1, is less than that of the first vibration part V1. Therefore, in the second vibration part V2, the amount of movement of the stator plate 17 relative to the second surface member 32 can be increased. In this way, the vibration energy in the second vibration part V2 can be converted into heat energy generated by friction, thereby further attenuating the vibration of the pair of stator plates 17.

[0072] -Features of the first embodiment-

[0073] The feature (1) of this embodiment is that the contact area C has a first friction area F1 and a second friction area F2 with unequal friction coefficients.

[0074] According to feature (1) of this embodiment, a first friction region F1 and a second friction region F2 with different friction coefficients can be configured in the parts where the vibration amount is different when a pair of stator plates 17, 17 are excited, so as to obtain a damping effect. In this way, the vibration of the stator core 11 can be suppressed.

[0075] The feature (2) of this embodiment is that a pair of stator plates 17, 17 have a first vibration part V1 and a second vibration part V2. When the first vibration part V1 is excited, it reaches a predetermined vibration amount. The vibration amount of the second vibration part V2 is greater than the vibration amount of the first vibration part V1. A first friction region F1 is formed in the first vibration part V1, and a second friction region F2 is formed in the second vibration part V2. The friction coefficient of the second friction region F2 is less than the friction coefficient of the first friction region F1.

[0076] According to feature (2) of this embodiment, a second friction region F2 with a friction coefficient less than that of the first friction region F1 is formed in a second vibration region V2 with a vibration amount greater than that of the first vibration region V1. When the laminate 12 vibrates, the stator plate 17 in the second vibration region V2 moves more than that in the first vibration region V1. In this way, the vibration energy in the second vibration region V2 can be converted into heat energy generated by friction, further attenuating the vibration of the pair of stator plates 17, 17.

[0077] The feature (3) of this embodiment is that the first friction area F1 is located closer to the fastening part 13 than the second friction area F2.

[0078] According to feature (3) of this embodiment, the vibration of the pair of stator plates 17, 17 near the fastening part 13 is less than the vibration of the part far from the fastening part 13. The first friction region F1 is located closer to the fastening part 13 than the second friction region F2, thus further attenuating the vibration of the pair of stator plates 17, 17.

[0079] The feature (4) of this embodiment is that a surface component 30 is provided on the surface of at least one of a pair of stator plates 17, 17, and at least one of the first friction region F1 and the second friction region F2 is formed on the surface component 30.

[0080] According to feature (4) of this embodiment, the vibration of a pair of stator plates 17, 17 can be attenuated by forming at least one of the first friction region F1 and the second friction region F2 on the surface member 30.

[0081] - Variations of the implementation method -

[0082] <Variation Example 1>

[0083] like Figure 3 As shown, in the stator core 11 of this embodiment, the first friction region F1 may also be located near the housing 4.

[0084] Specifically, the stacked body 12 of the stator core 11 is held by the housing 4. A first friction region F1 is radially spaced from the inner circumferential surface of the housing 4 by a predetermined interval, and the first friction region F1 is formed circumferentially along the housing 4. A second friction region F2 is further away from the housing 4 than the first friction region F1. The second friction region F2 is radially spaced from the first friction region F1 and is formed circumferentially. The distance L2 between the second friction region F2 and the housing 4 is longer than the distance L1 between the first friction region F1 and the housing 4 (L1 < L2).

[0085] In this example, when the laminate 12 vibrates, near the housing 4 holding the laminate 12 (first vibration section V1), a pair of stator plates 17, 17 vibrate with a predetermined vibration amount. On the other hand, in the part away from the housing 4 (second vibration section V2), the stator plates 17 can move relative to each other, and therefore vibrate with a vibration amount greater than that of the first vibration section V1.

[0086] The friction coefficient of the second vibrating part V2, which is farther away from the housing 4, is smaller than that of the first vibrating part V1, which is closer to the housing 4. Therefore, the movement of the stator plate 17 relative to the second surface member 32 can be increased in the second vibrating part V2. In this way, the energy generated by vibration in the second vibrating part V2 can be converted into heat energy generated by friction, thereby further attenuating the vibration of the pair of stator plates 17.

[0087] <Variation Example 2>

[0088] In the stator core 11 of this embodiment, the surface component 30 can be an adhesive material, varnish, paint applied to the surface of the stator plate 17, etc. In this modified example, the vibration of a pair of stator plates 17, 17 can also be attenuated.

[0089] <Variation Example 3>

[0090] In the stator core 11 of this embodiment, the surface roughness of the first friction region F1 and the second friction region F2 in a pair of stator plates 17, 17 may be different.

[0091] Specifically, for example, at least one of the multiple friction regions F1, F2 can be formed by changing the surface roughness of at least one of the surfaces of a pair of stator plates 17, 17. In other words, the surface roughness of the stator plate 17 can be changed instead of providing the surface component 30 on the stator plate 17.

[0092] When performing a process to change the surface roughness, minute irregularities can be formed on the surface of at least one of the pair of stator plates 17, 17 in the friction areas F1, F2. Alternatively, a mirror finish can be applied to the surface of at least one of the pair of stator plates 17, 17.

[0093] Here, surface roughness refers to the arithmetic mean roughness Ra. In this modified example, the surface roughness is measured using a contact surface roughness meter. The arithmetic mean roughness value of the second friction region F2 is less than the arithmetic mean roughness value of the first friction region F1.

[0094] In this modified example, the friction coefficients of the first friction region F1 and the second friction region F2 can also be changed by the fact that the surface roughness of the first friction region F1 and the second friction region F2 are different from each other.

[0095] (Other implementation methods)

[0096] The above-described embodiments can also be configured as follows.

[0097] In the stator core 11 of the above embodiment, the stator plates 17 can also be fixed to each other by riveting. In this case, the riveting part is the fastening part 13 of this disclosure.

[0098] In the stator core 11 of the above embodiment, the fastening part 13 may also be in contact with the first friction region F1. In other words, the shortest distance L1 between the fastening part 13 and the first friction region F1 may also be 0.

[0099] In the stator core 11 of the above embodiment, the first friction region F1 and the second friction region F2 can also be in contact.

[0100] In the stator core 11 of the above embodiment, the width d1 of the first friction region F1 of each contact region C can also be different. Similarly, the width d2 of the second friction region F2 can also be different.

[0101] Alternatively, in the stator core 11 of the above embodiment, a portion of the multiple contact areas C have multiple friction areas F1 and F2.

[0102] The structure of the contact area C in the above embodiment can also be used for the rotor core 21. In this case, the rotating shaft 2a corresponds to the retaining member of this disclosure.

[0103] In the above embodiments, an electric motor was described as an example of rotating electrical machinery, but the structure of the contact area C can also be used for a generator.

[0104] The structure of the contact area C in the above embodiment can also be used for a stationary device.

[0105] The above describes the embodiments and modifications, but it should be understood that various changes can be made to the embodiments and specific aspects without departing from the spirit and scope of the claims. Furthermore, appropriate combinations or substitutions can be made to the above embodiments, modifications, and other embodiments as long as the functionality of the subject matter of this disclosure is not impaired.

[0106] The terms "first," "second," "third," etc., used above are to distinguish statements marked with these terms and are not used to limit the number or order of the statements.

[0107] -Industry Applicability-

[0108] In summary, this disclosure is useful for iron cores, rotating electrical machinery, and stationary devices.

[0109] - Symbol Explanation -

[0110] 1 compressor

[0111] 2. Electric motors (rotating electrical machinery)

[0112] 2a Rotary shaft (holding component)

[0113] 4. Housing (Retaining Components)

[0114] 11. Stator core (iron core)

[0115] 12-layer stack

[0116] 13 Fastening parts

[0117] 17 Stator plate

[0118] 21 Rotor core (iron core)

[0119] 22-layer stack

[0120] 30 Surface components

[0121] 31 First surface component

[0122] 32 Second surface component

[0123] C Contact Area

[0124] F1 First Friction Zone

[0125] F2 Second Friction Zone

[0126] V1 First Vibration Section

[0127] V2 Second Vibration Section

Claims

1. A core, characterized in that: It includes a laminate (12, 22) consisting of multiple electromagnetic steel plates stacked on top of each other. The laminate (12, 22) has a contact area (C) formed between adjacent pairs of electromagnetic steel plates. The contact area (C) has: a direct contact area where a pair of adjacent electromagnetic steel plates are in direct contact; and a first friction area (F1) and a second friction area (F2) where the coefficient of friction changes relative to the direct contact area. The friction coefficients of the first friction region (F1) and the second friction region (F2) are different.

2. The iron core (11, 21) according to claim 1, characterized in that: The pair of electromagnetic steel plates have a first vibrating part (V1) and a second vibrating part (V2). When the first vibrating part (V1) is excited, it reaches a specified vibration amount. The vibration amount of the second vibrating part (V2) is greater than that of the first vibrating part (V1). The first friction region (F1) is formed in the first vibrating part (V1). The second friction region (F2) is formed in the second vibration part (V2). The coefficient of friction of the second friction region (F2) is less than that of the first friction region (F1).

3. The iron core (11, 21) according to claim 1 or 2, characterized in that: The iron core (11, 21) also includes a fastening part (13) for fastening the pair of electromagnetic steel plates. The first friction area (F1) is located closer to the fastening part (13) than the second friction area (F2). The coefficient of friction of the second friction region (F2) is less than that of the first friction region (F1).

4. The iron core (11, 21) according to claim 1 or 2, characterized in that: The laminates (12, 22) are held by holding components (4, 2a). The distance between the second friction area (F2) and the retaining member (4, 2a) is longer than the distance between the first friction area (F1) and the retaining member (4, 2a). The coefficient of friction of the second friction region (F2) is less than that of the first friction region (F1).

5. The iron core (11, 21) according to claim 1 or 2, characterized in that: A surface component (30) is provided on the surface of at least one of the pair of electromagnetic steel plates. At least one of the first friction region (F1) and the second friction region (F2) is formed on the surface component (30).

6. The iron core (11, 21) according to claim 1 or 2, characterized in that, The surface roughness of the first friction area (F1) and the second friction area (F2) of the pair of electromagnetic steel plates is different.

7. A rotating electromechanical device, characterized in that: Includes the iron core (11, 21) as described in any one of claims 1 to 6.

8. A stationary device, characterized in that: Includes the iron core (11, 21) as described in any one of claims 1 to 6.

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