Electric motor, compressor, and device

Abstract

To provide a high-efficiency and low-vibration electric motor, a compressor using the electric motor, and an apparatus using the compressor, in which an insulator does not float from a stator due to entry of shavings between the insulator and the stator during assembly of the electric motor, and inconvenience due to entry of shavings into a gap between the stator and a rotor does not occur after assembly of the electric motor.SOLUTION: By raising the fixing protrusion 54 from the 53a of the bottom surface of the insulator yoke recess, the fixing protrusion 54 is formed of a fixing protrusion root portion 54X located in the insulator yoke recess 53 and a fixing protrusion protruding portion 54Y protruding from the insulator yoke recess 53, an annular groove is formed around the fixing protrusion root portion 54X by the insulator yoke recess 53, and the insulator 50 is fixed to the stator 30 by inserting the fixing protrusion protruding portion 54Y into the fixing recess 34.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an electric motor, a compressor using the electric motor, and equipment using the compressor. [Background technology]

[0002] The electric motor described in Patent Document 1 reduces the impact on magnetic performance by providing a fitting hole in the back yoke portion of the stator, and attaches the insulator to the stator by fitting a protrusion on the insulator into the hole in the back yoke.When winding the coil around the insulator, the insulator is engaged with the stator at both end faces of the stator and insulator at locations away from the fitting hole in the back yoke portion in order to prevent the insulator from rotating and reducing the winding space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-95492 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the projections of the insulator are fitted precisely into the fitting holes of the stator, as in the electric motor described in Patent Document 1, the projections of the insulator may be scraped off by the stator. As a result, scrapings may collect at the base of the projections on the insulator, causing the insulator to lift off the end face of the stator.

[0005] Therefore, the present invention aims to provide a highly efficient, low-vibration electric motor, a compressor using this electric motor, and equipment using this compressor, which prevents shavings from getting between the insulator and stator during assembly of the electric motor, causing the insulator to lift off the stator, and prevents shavings from getting into gaps in the stator or rotor after assembly of the electric motor, causing inconvenience. [Means for solving the problem]

[0006] The electric motor 14 of the present invention as set forth in claim 1 comprises: a rotor 20 formed by laminating rotor core sheets and having a plurality of permanent magnets arranged around a rotating shaft 4; a stator 30 formed by laminating stator core sheets and arranged with an air gap between the rotor 20; and insulators 50 arranged on both end faces of the stator 30 in the lamination direction, the stator 30 having an annular stator yoke 31 centered on the rotating shaft 4, a plurality of stator teeth 32 extending from the stator yoke 31 toward the rotor 20, and slots 33 formed between the stator teeth 32, and windings 41 are arranged in the slots 33, the stator teeth 32 having stator tooth bases 32A around which the windings 41 are wound and stator tooth tip ends 32B that form stator tooth inner circumferential surfaces 32S that face the rotor 20; and the insulator 50 having an insulator yoke portion 51 located on the stator yoke 31 and an insulator yoke portion 52 located on the stator yoke 31 and an insulator yoke portion 53 located on the stator teeth 32. and a fixing protrusion 54 provided on the insulator yoke portion 51, and the stator yoke 31 has a fixing recess 34. The fixing protrusion 54 is raised from an insulator yoke recess bottom surface 53a of an insulator yoke recess 53 formed in the insulator yoke portion 51, so that the fixing protrusion 54 is formed with a fixing protrusion root portion 54X located within the insulator yoke recess 53 and a fixing protrusion protruding portion 54Y protruding from the insulator yoke recess 53. An annular groove is formed around the fixing protrusion root portion 54X by the insulator yoke recess 53, and the fixing protrusion protruding portion 54Y is inserted into the fixing recess 34 to fix the insulator 50 to the stator 30. The present invention described in claim 2 is characterized in that, in the electric motor 14 described in claim 1, the fixing protrusion protruding portion 54Y has a tapered portion 54Ya whose cross-sectional area decreases toward the tip side and a straight portion 54Yb whose cross-sectional area does not change, the fixing protrusion is connected to the fixing protrusion base portion 54X by the straight portion 54Yb, and the tapered portion 54Ya is longer than the straight portion 54Yb. The present invention according to a third aspect is characterized in that in the electric motor 14 according to the second aspect, the length of the straight portion 54Yb is set to be equal to or greater than the thickness of one of the stator core sheets. The present invention as set forth in claim 4 is characterized in that in the electric motor 14 as set forth in claim 1, the fixing protrusion 54 is divided into a plurality of pieces. The present invention described in claim 5 is characterized in that, in the electric motor 14 described in claim 1, when the fixing protrusion protruding portion 54Y is inserted into the fixing recess 34, a gap L greater than the thickness of one of the stator core sheets is formed between the fixing protrusion protruding portion 54Y and the fixing recess bottom surface 34a of the fixing recess 34. The present invention of claim 6 is characterized in that, in the electric motor 14 of claim 1, the bottom surface 53a of the insulator yoke recess is a flat surface, and the bottom outer peripheral portion 53b and bottom inner peripheral portion 53c of the insulator yoke recess bottom surface 53a are R-shaped. The present invention of claim 7 is characterized in that, in the electric motor 14 of claim 1, when the radial dimension of the opening surface side of the annular groove is a and the depth dimension to the bottom surface 53a of the insulator yoke recess is b, a:b is in the range of 1:1 to 1:20. The present invention described in claim 8 is characterized in that, in the electric motor 14 described in claim 1, the stator 30, which is divided into multiple pieces for each stator tooth 32, is arranged in a circular ring shape, the insulator 50 is arranged for each stator 30, stator tooth inner peripheral tapered surfaces 32Sa are formed on both sides of the stator tooth inner peripheral surface 32S, so that the air gap gradually expands toward the end, and the insulator tooth tip end 52B is formed with a locking protrusion 55 that abuts against the stator tooth inner peripheral tapered surface 32Sa. The electric motor 14 of the present invention as set forth in claim 9 comprises a rotor 20 formed by laminating rotor core sheets and having a plurality of permanent magnets arranged around a rotating shaft 4, a stator 30 formed by laminating stator core sheets and arranged with an air gap between the rotor 20, and insulators 50 arranged on both end surfaces of the stator 30 in the lamination direction, the stator 30 having an annular stator yoke 31 centered on the rotating shaft 4, a plurality of stator teeth 32 extending from the stator yoke 31 toward the rotor 20, and slots 33 formed between the stator teeth 32, and windings 41 are arranged in the slots 33, the stator teeth 32 having stator tooth bases 32A around which the windings 41 are wound and stator tooth tip ends 32B that form stator tooth inner circumferential surfaces 32S that face the rotor 20, and the insulators 50 are insulator yokes positioned on the stator yoke 31. and a fixing protrusion 54 provided on the insulator yoke portion 51, an insulator tooth base portion 52A located at the stator tooth base portion 32A, an insulator tooth tip portion 52B located at the stator tooth tip portion 32B, the stator 30 divided into a plurality of pieces is arranged in a circular ring shape for each of the stator teeth 32, the insulator 50 is arranged for each of the stators 30, the stator yoke 31 has fixing recesses 34, and the insulator 50 is fixed to the stator 30 by inserting the fixing protrusions 54 into the fixing recesses 34, characterized in that stator tooth inner peripheral tapered surfaces 32Sa are formed on both sides of the stator tooth inner peripheral surface 32S, so that the air gap gradually widens toward the ends, and the insulator tooth tip portions 52B are formed with locking protrusions 55 that abut against the stator tooth inner peripheral tapered surfaces 32Sa. The compressor 10 of the present invention described in claim 10 is a compressor 10 using the electric motor 14 described in claims 1 to 9, characterized in that a compression mechanism unit 13 is connected to the rotating shaft 4 and the refrigerant is compressed by the compression mechanism unit 13. The equipment of the present invention described in claim 11 is an equipment using the compressor 10 described in claim 10, characterized in that the compressor 10, the condenser 17, the pressure reducing device 18, and the evaporator 19 are connected in a ring shape by piping. [Effects of the Invention]

[0007] According to the present invention, when the protruding portion of the fixing protrusion is inserted into the fixing recess, and when vibration occurs such as when the electric motor is operating, the shavings generated when the protruding portion of the fixing protrusion is scraped off by the fixing recess can be retained in the annular groove. Furthermore, according to the present invention, the insulator is fixed to the stator by inserting the fixing protrusion into the fixing recess, and the locking protrusion is abutted against the inner tapered surface of the stator tooth, thereby reliably preventing the insulator from shifting from the stator, particularly when winding the windings around the stator. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing the configuration of a compressor using an electric motor according to an embodiment of the present invention, and a refrigeration device using this compressor; [Figure 2] 1 is a diagram showing the main components of a motor according to the present embodiment; [Figure 3] FIG. 1 is a perspective view showing a stator and an insulator that constitute the electric motor according to the present embodiment. [Figure 4] FIG. 10 shows the stator and insulator. [Figure 5] FIG. 10 is a cross-sectional view showing a fixing protrusion provided on an insulator yoke and a fixing recess provided on a stator yoke. [Figure 6] A configuration diagram of a scroll compressor using the electric motor according to this embodiment and a refrigeration system using this scroll compressor. DETAILED DESCRIPTION OF THE INVENTION

[0009] In a first embodiment of the present invention, the electric motor has a fixing protrusion extending upward from the bottom surface of the insulator yoke recess formed in the insulator yoke portion. The fixing protrusion is formed by a fixing protrusion root portion located within the insulator yoke recess and a fixing protrusion protruding portion protruding from the insulator yoke recess. An annular groove is formed by the insulator yoke recess around the fixing protrusion root portion, and the fixing protrusion protruding portion is inserted into the fixing recess to fix the insulator to the stator. According to this embodiment, when the fixing protrusion protruding portion is inserted into the fixing recess and when vibrations occur during operation of the electric motor, shavings generated when the fixing protrusion protruding portion is scraped by the fixing recess can be retained in the annular groove. Therefore, during assembly of the electric motor, shavings do not get between the insulator and the stator, causing the insulator to lift off the stator. After assembly, problems caused by shavings getting into gaps between the stator and rotor are prevented, resulting in a highly efficient, low-vibration electric motor.

[0010] In a second embodiment of the present invention, in the electric motor according to the first embodiment, the protruding portion of the fixing projection has a tapered portion whose cross-sectional area decreases toward the tip end and a straight portion whose cross-sectional area does not change, and the straight portion is continuous with the base portion of the fixing projection, and the tapered portion is longer than the straight portion. According to this embodiment, the protruding portion of the fixing projection can be inserted into the fixing recess by the straight portion, and the tapered portion is located inside the fixing recess, so that the springiness of the tapered portion provides excellent vibration resistance and reduces the generation of shavings.

[0011] In the third embodiment of the present invention, the length of the straight portion of the electric motor according to the second embodiment is set to be equal to or greater than the thickness of one stator core sheet, so that the protruding portion of the fixing projection can be securely inserted into the fixing recess.

[0012] In the fourth embodiment of the present invention, the fixing protrusion in the electric motor according to the first embodiment is divided into multiple parts. According to this embodiment, the spring properties of the fixing protrusion can be further improved, and the generation of shavings can be reduced due to excellent vibration resistance.

[0013] In the fifth embodiment of the present invention, in the electric motor according to the first embodiment, when the fixing protrusions are inserted into the fixing recesses, a gap of at least the thickness of one stator core sheet is formed between the fixing protrusions and the bottom surface of the fixing recesses. According to this embodiment, the insulator can be reliably fixed in close contact with the stator without floating up from the stator.

[0014] In a sixth embodiment of the present invention, in the electric motor according to the first embodiment, the bottom surface of the insulator yoke recess is flat, and the outer and inner peripheries of the bottom surface of the insulator yoke recess are rounded. This embodiment is easy to manufacture and reduces the generation of shavings.

[0015] In a seventh embodiment of the present invention, in the electric motor according to the first embodiment, the ratio a:b is set to a range of 1:1 to 1:20, where a is the radial dimension of the opening side of the annular groove and b is the depth dimension to the bottom surface of the insulator yoke recess. According to this embodiment, generated shavings can be trapped in the annular groove.

[0016] In the eighth embodiment of the present invention, in the electric motor according to the first embodiment, the stator is divided into multiple pieces, each for a stator tooth, and arranged in a circular pattern, and an insulator is arranged for each stator. Tapered inner surfaces of the stator teeth are formed on both sides of the inner surfaces of the stator teeth so that the air gap gradually widens toward the ends, and locking protrusions are formed at the tips of the insulator teeth to abut against the tapered inner surfaces of the stator teeth. According to this embodiment, the insulator is fixed to the stator by inserting the fixing protrusions into the fixing recesses, and the locking protrusions abut against the tapered inner surfaces of the stator teeth, which reliably prevents the insulator from slipping off the stator, particularly when winding the windings around the stator.

[0017] In a ninth embodiment of the present invention, a motor has a stator divided into multiple pieces, each for a stator tooth, arranged in a circular pattern, an insulator arranged for each stator, a stator yoke having a fixing recess, and fixing protrusions inserted into the fixing recesses to fix the insulator to the stator, tapered inner circumferential surfaces of the stator teeth are formed on both sides of the inner circumferential surface of the stator teeth, with the air gap gradually increasing toward the ends, and locking protrusions are formed at the tips of the insulator teeth to abut against the tapered inner circumferential surfaces of the stator teeth. According to this embodiment, inserting the fixing protrusions into the fixing recesses fixes the insulator to the stator, and abutting the locking protrusions against the tapered inner circumferential surfaces of the stator teeth reliably prevents the insulator from slipping off the stator, particularly when winding the winding around the stator.

[0018] A compressor according to a tenth embodiment of the present invention is a compressor using the electric motor according to any one of the first to ninth embodiments, and has a compression mechanism connected to a rotating shaft, and compresses a refrigerant by the compression mechanism. According to this embodiment, a compressor with low vibration can be realized.

[0019] The device according to the eleventh embodiment of the present invention is a device using the compressor according to the tenth embodiment, in which the compressor, condenser, pressure reducing device, and evaporator are connected in a ring shape by piping. According to this embodiment, it is possible to realize a device that is low in noise due to low vibration and highly efficient without reducing torque. [Example]

[0020] A compressor according to an embodiment of the present invention will be described below, but the present invention is not limited to the following embodiment.

[0021] 1 is a configuration diagram of a compressor using an electric motor according to this embodiment, and a refrigeration system using this compressor. The compressor according to this embodiment is a rotary compressor. A suction pipe 2 for drawing in a refrigerant and a discharge pipe 3 for discharging the refrigerant are connected to the sealed container 1. Inside the sealed container 1, there are disposed a compression mechanism 13 for compressing the refrigerant drawn in through the suction pipe 2 and an electric motor 14 for driving the compression mechanism 13. The bottom of the sealed container 1 serves as an oil reservoir 11. The compression mechanism 13 is composed of a cylinder 13a, a piston 13b, a vane (not shown), a main bearing 13c, and an auxiliary bearing 13d. The cylinder 13a is fixed to the sealed container 1. The piston 13b is rotatably fitted to an eccentric portion 4a of a rotary shaft 4 that passes through the cylinder 13a. The vane reciprocates in the vane groove following the piston 13b that rolls along the inner wall surface of the cylinder 13a. The main bearing 13c and the auxiliary bearing 13d seal the upper and lower end surfaces of the cylinder 13a and support the rotary shaft 4. The electric motor 14 is made up of a stator 30 fixed to the sealed container 1 and a rotor 20 arranged on the inner periphery of the stator 30. The refrigerant is drawn into the compression mechanism 13 through the suction pipe 2 and compressed in the compression mechanism 13. Thereafter, the refrigerant passes through the electric motor 14 and is discharged from the discharge pipe 3.

[0022] In the refrigeration system according to this embodiment, a compressor 10, a condenser 17, a pressure reducing device 18, and an evaporator 19 are connected in a ring shape by piping. The condenser 17 condenses the refrigerant discharged from the discharge pipe 3, the pressure reducing device 18 reduces the pressure of the refrigerant condensed in the condenser 17, and the evaporator 19 evaporates the refrigerant reduced in pressure by the pressure reducing device 18. The refrigerant evaporated in the evaporator 19 is returned to the compressor 10 via the accumulator 16 . 1, only one end (lower end) of the rotating shaft 4 is supported by bearings (main bearing 13c, sub-bearing 13d), and therefore axial runout is likely to occur at the other end (upper end) of the rotating shaft 4. Therefore, the electric motor 14, which can simultaneously suppress electromagnetic force in the radial direction and torque ripple, which is torque unevenness in the rotational direction, is highly effective in reducing vibration.

[0023] 2A and 2B are diagrams showing the main components of the electric motor according to this embodiment, with FIG. 2A being a plan view with windings, FIG. 2B being a plan view with no windings, FIG. 2C being a cross-sectional view taken along line AA in FIG. 2A, and FIG. 2D being a cross-sectional view taken along line B-Bb in FIG. 2B. FIG. 3 is a perspective view showing a stator and an insulator that constitute the electric motor according to this embodiment, and FIG. 4 is a view showing the stator and the insulator. In this embodiment, the rotor 20 is fixed to the rotating shaft 4, and the stator 30 is fixed to the sealed container 1 (see FIG. 1).

[0024] The rotor 20 is formed into a cylindrical shape by laminating rotor core sheets, and has a plurality of permanent magnets (not shown) arranged around the rotating shaft 4. The rotor core sheet is an electromagnetic steel sheet with a thickness of about 0.3 mm, and the rotor 20 is made of a magnetic material.

[0025] The stator 30 is disposed with an air gap between it and the rotor 20. The stator 30 is constructed by laminating stator core sheets in the axial direction of the rotating shaft 4. The stator core sheets are electromagnetic steel sheets with a thickness of about 0.3 mm, and the stator 30 is constructed of a magnetic material. As shown in Fig. 3(a), the stator 30 has an annular stator yoke 31 centered on the rotation axis 4 of the rotor 20, a plurality of stator teeth 32 extending from the stator yoke 31 toward the rotor 20, and slots 33 formed between the stator teeth 32. A winding 41 (Figs. 2(a) and 2(c)) is arranged in the slots 33. The stator yoke 31 has a fixing recess 34 (FIG. 3).

[0026] The stator teeth 32 have a stator teeth base 32A around which a winding 41 (Figures 2(a) and 2(c)) is wound via an insulating material 42 (Figure 2(c)), and a stator teeth tip portion 32B formed at the tip of the stator teeth base 32A. Stator tooth tip portions 32B form stator tooth inner peripheral surfaces 32S that face rotor outer peripheral surface 20S of rotor 20. Stator tooth tip portions 32B are formed to protrude on both sides beyond circumferential width T of stator tooth base portions 32A. Stator tooth inner peripheral tapered surfaces 32Sa are formed on both sides of this protruding stator tooth inner peripheral surface 32S, with the air gap gradually expanding toward the ends.

[0027] As shown in Figure 3, insulator 50 has an insulator yoke portion 51 located on stator yoke 31, an insulator tooth base portion 52A located on stator tooth base portion 32A, an insulator tooth tip portion 52B located on stator tooth tip portion 32B, and a fixing protrusion portion 54 provided on insulator yoke portion 51. Further, the insulator tooth tip end portion 52B is formed with a locking projection 55 that abuts against the stator tooth inner peripheral tapered surface 32Sa. It is preferable that locking protrusions 55 are formed on both sides of insulator tooth tip portions 52B. Furthermore, it is preferable that locking protrusions 55 have locking protrusion extensions 55a that come into contact with side surfaces 32Ba of stator tooth tip portions 32B. The fixing protrusion 54 rises from the bottom surface 53 a of the insulator yoke recess 53 formed in the insulator yoke portion 51 . The fixing protrusion 54 is divided into two pieces. By dividing the fixing protrusion 54 into multiple pieces in this way, the spring properties of the fixing protrusion 54 can be further improved, and the generation of shavings can be reduced due to excellent vibration resistance. As shown in FIG. 4, insulators 50 are disposed on both end surfaces of the stator 30 in the lamination direction.

[0028] In this embodiment, the stator 30 is divided into a plurality of pieces for each stator tooth 32 and arranged in an annular shape. In the case where the stator 30 is divided into a plurality of pieces, each for a stator tooth 32, and arranged in an annular shape as in this embodiment, and an insulator 50 is arranged for each divided stator 30, the fixing protrusions 54 are inserted into the fixing recesses 34 to fix the insulator 50 to the stator 30, and the locking protrusions 55 are brought into contact with the inner peripheral tapered surfaces 32Sa of the stator teeth, thereby reliably preventing the insulator 50 from shifting from the stator 30, particularly when winding the winding 41 around the stator 30. The fixing protrusions 54 are preferably attached to the fixing recesses 34 by press-fitting.

[0029] FIG. 5 is a cross-sectional view showing a fixing protrusion provided on an insulator yoke portion and a fixing recess provided on a stator yoke. The fixing protrusion 54 is formed by a fixing protrusion root portion 54X located within the insulator yoke recess 53 and a fixing protrusion protruding portion 54Y protruding from the insulator yoke recess 53. An annular groove is formed around the fixing projection base portion 54X by the insulator yoke recess 53. FIG. 5 shows a state in which the insulator 50 is fixed to the stator 30 by inserting the fixing projection protrusion 54Y into the fixing recess . The protruding fixing portion 54Y has a tapered portion 54Ya whose cross-sectional area decreases toward the tip end, and a straight portion 54Yb whose cross-sectional area does not change, and is continuous with the base portion 54X of the fixing projection by the straight portion 54Yb. The tapered portion 54Ya is longer than the straight portion 54Yb. The straight portion 54Yb has a length equal to or greater than the thickness of one stator core sheet. According to this embodiment, the straight portion 54Yb allows the fixing protrusion 54Y to be inserted into the fixing recess 34, and the tapered portion 54Ya is positioned within the fixing recess 34, so that the spring properties of the tapered portion 54Ya provide excellent vibration resistance, thereby reducing the generation of shavings. Furthermore, since the length of the straight portion 54Yb is set to be equal to or greater than the thickness of one stator core sheet, the fixing projection protruding portion 54Y can be inserted into the fixing recess 34 reliably.

[0030] When the fixing protrusion protruding portion 54Y is inserted into the fixing recess 34, a gap L greater than the thickness of one stator core sheet is formed between the fixing protrusion protruding portion 54Y and the fixing recess bottom surface 34a of the fixing recess 34. That is, the protruding fixing protrusion 54Y is shorter than the depth of the fixing recess 34. By forming the gap L between the protruding fixing protrusion 54Y and the fixing recess bottom surface 34a of the fixing recess 34 in this manner, the insulator 50 can be reliably fixed in close contact with the stator 30 without floating up from the stator 30.

[0031] If the radial dimension of the annular groove on the opening side is a and the depth dimension to the insulator yoke recess bottom surface 53a is b, then by setting the ratio a:b in the range of 1:1 to 1:20, chips generated can be trapped in the annular groove. Preferably, the ratio a:b is in the range of 1:2 to 1:10, and more preferably in the range of 1:3 to 1:5. By setting the depth dimension b equal to or greater than the radial dimension a on the opening side, chips generated when the fixing protrusion protruding portion 54Y is scraped by the fixing recess 34 can be trapped in the annular groove. By setting the depth dimension b to be three times or more the radial dimension a on the opening side, springiness can be imparted to the fixing protrusion root portion 54X.

[0032] Figure 5(b) shows the circled portion of Figure 5(a), Figure 5(c) shows another embodiment of the portion corresponding to Figure 5(b), Figure 5(d) shows yet another embodiment of the portion corresponding to Figure 5(b), and Figure 5(e) shows yet another embodiment of the portion corresponding to Figure 5(b). In FIG. 5(b), the bottom surface 53a of the insulator yoke recess is flat, and the bottom outer peripheral portion 53b and bottom inner peripheral portion 53c of the insulator yoke recess bottom surface 53a are rounded. In FIG. 5(c), the bottom surface 53a of the insulator yoke recess is flat, and the bottom outer periphery 53b and the bottom inner periphery 53c of the insulator yoke recess bottom surface 53a are angular. FIG. 5(d) shows an insulator yoke recess bottom surface 53a formed as a flat surface, with outer periphery 53b and inner periphery 53c of insulator yoke recess bottom surface 53a formed as inclined surfaces. FIG. 5(e) shows an insulator yoke recessed portion having a bottom surface 53a formed as a bullet-shaped concave surface. By forming the bottom surface 53a of the insulator yoke recess into the shape shown in FIGS. 5(b) to 5(e), it is possible to improve productivity and reduce the generation of shavings.

[0033] FIG. 6 is a diagram showing the configuration of a scroll compressor using the electric motor according to this embodiment, and a refrigeration system using this scroll compressor. The compressor 10 according to this embodiment includes, in a sealed container 1, a compression mechanism 13 for compressing refrigerant gas, and an electric motor 14 for driving the compression mechanism 13. The inside of the sealed container 1 is divided into one container space and the other container space by the compression mechanism part 13. An electric motor 14 is disposed in the other container space. The other space within the container is divided into a compression mechanism space and an oil storage space by the electric motor 14. An oil storage section 11 is disposed in the oil storage space. A suction pipe 2 and a discharge pipe 3 are fixed to the sealed container 1 by welding. The suction pipe 2 and the discharge pipe 3 lead to the outside of the sealed container 1 and are connected to components that make up the refrigeration cycle. The suction pipe 2 introduces refrigerant gas from the outside of the sealed container 1, and the discharge pipe 3 discharges refrigerant gas from one of the container spaces to the outside of the sealed container 1.

[0034] The main bearing member 7a is fixed inside the sealed container 1 by welding, shrink fitting, or the like, and supports the rotating shaft 4. One end of the rotating shaft 4 is supported by the main bearing member 7a, and the other end is supported by a bearing 7b. A fixed scroll 13j is bolted to this main bearing member 7a. An orbiting scroll 13k that meshes with the fixed scroll 13j is sandwiched between the main bearing member 7a and the fixed scroll 13j. The fixed scroll 13j and the orbiting scroll 13k constitute a scroll-type compression mechanism 13. A rotation restraint mechanism 9 such as an Oldham ring is provided between the orbiting scroll 13k and the main bearing member 7a. The rotation restraint mechanism 9 prevents the orbiting scroll 13k from rotating on its axis and guides the orbiting scroll 13k to move in a circular orbit. The orbiting scroll 13k is eccentrically driven by an eccentric portion 4a provided at the upper end of the rotary shaft 4. Due to this eccentric drive, the compression chamber formed between the fixed scroll 13j and the orbiting scroll 13k moves from the outer periphery toward the center of the compression mechanism portion 13, reducing its volume and performing compression.

[0035] The electric motor 14 has a rotor 20 that is rotatably arranged around the rotary shaft 4, and a stator 30 that is arranged via an air gap with the rotor 20. The configuration of the electric motor 14 is the same as that shown in Fig. 2, and therefore a description thereof will be omitted.

[0036] The refrigerant is drawn into the compression mechanism 13 through the suction pipe 2 and compressed in the compression mechanism 13. Thereafter, the refrigerant is discharged from the discharge pipe 3. In the refrigeration system according to this embodiment, a compressor 10, a condenser 17, a pressure reducing device 18, and an evaporator 19 are connected in a ring shape by piping. The condenser 17 condenses the refrigerant discharged from the discharge pipe 3, the pressure reducing device 18 reduces the pressure of the refrigerant condensed in the condenser 17, and the evaporator 19 evaporates the refrigerant reduced in pressure by the pressure reducing device 18. The refrigerant evaporated in the evaporator 63 is returned to the compressor 10 through the suction pipe 2. In the compressor 10 shown in FIG. 6, one end (lower end) of the rotating shaft 4 is supported by the bearing 7b, and the other end (upper end) of the rotating shaft 4 is supported by the main bearing member 7a, so that axial runout is unlikely to occur. However, vibrations from the electric motor 14 are easily transmitted to the sealed container 1, so the electric motor 14 is highly effective in reducing vibrations, as it can simultaneously suppress electromagnetic force in the radial direction and torque ripple, which is torque unevenness in the rotational direction.

[0037] As shown in FIGS. 1 and 6, the electric motor 14 according to this embodiment is suitable for a compressor 10 in which a compression mechanism 13 is connected to a rotary shaft 4 and the compression mechanism 13 compresses a refrigerant. Although the present embodiment has been described using a vertical compressor 10, the same effect can be obtained with a horizontal compressor 10, and the present invention is also suitable for, for example, an in-vehicle compressor. Also, although a rotary compressor is shown in Fig. 1 and a scroll compressor is shown in Fig. 6, a reciprocating compressor or other compressors may also be used. Low noise is particularly required for on-vehicle compressors, so the use of the electric motor 14 according to this embodiment, which can achieve high efficiency and low vibration, is highly effective in reducing noise due to low vibration. Furthermore, in a refrigeration system in which the compressor 10 using the electric motor 14 according to this embodiment is connected in a ring shape with piping together with the condenser 17, pressure reducing device 18, and evaporator 19, low noise due to low vibration and high efficiency can be achieved without reducing torque.

[0038] As described above, in the electric motor 14 according to this embodiment, the fixing protrusion 54 is raised from the bottom surface 53a of the insulator yoke recess 53 formed in the insulator yoke portion 51, so that the fixing protrusion 54 is formed by the fixing protrusion root portion 54X located within the insulator yoke recess 53 and the fixing protrusion protruding portion 54Y protruding from the insulator yoke recess 53. An annular groove is formed around the fixing protrusion root portion 54X by the insulator yoke recess 53, and the fixing protrusion protruding portion 54Y is inserted into the fixing recess 34 to fix the insulator 50 to the stator 30. This allows for the annular groove to retain shavings generated when the fixing protrusion protruding portion 54Y is scraped off by the fixing recess 34 when the fixing protrusion protruding portion 54Y is inserted into the fixing recess 34 and when the electric motor 14 is vibrating, for example, during operation. Therefore, when assembling the electric motor 14, shavings do not get in between the insulator 50 and the stator 30, causing the insulator 50 to lift off the stator 30, and after assembling the electric motor 14, no inconvenience occurs due to shavings getting into the gaps between the stator 30 and the rotor 20, making it possible to realize a highly efficient, low-vibration electric motor 14.

[0039] In addition, in the electric motor 14 according to this embodiment, the stator 30 is divided into multiple pieces, each for a stator tooth 32, and arranged in a circular ring shape. An insulator 50 is arranged for each stator 30. The stator yoke 31 has a fixing recess 34, and the insulator 50 is fixed to the stator 30 by inserting the fixing protrusion 54 into the fixing recess 34. Stator tooth inner tapered surfaces 32Sa are formed on both sides of the stator tooth inner surface 32S, and the air gap gradually expands toward the end. The insulator tooth tip portions 52B are formed with locking protrusions 55 that abut against the stator tooth inner tapered surfaces 32Sa, allowing the fixing protrusions 54 to be inserted into the fixing recess 34. This fixes the insulator 50 to the stator 30 and causes the locking protrusion 55 to abut against the inner tapered surface 32Sa of the stator tooth, thereby reliably preventing the insulator 50 from shifting from the stator 30, especially when winding the winding 41 around the stator 30. In this embodiment, the stator 30 is divided into a plurality of pieces for each stator tooth 32 and arranged in a circular shape, but the same applies to an integrated stator 30. [Industrial Applicability]

[0040] The compressor of the present invention is useful for appliances such as hot water heating systems, indoor air conditioners, vehicle air conditioners, water heaters, refrigerators, showcases, chillers, and freezers. [Explanation of symbols]

[0041] 1. Airtight container 2 Suction tube 3 Discharge pipe 4 rotation axes 4a Eccentric part 7a Main bearing member 7b Bearing 9 Rotation restraint mechanism 10 Compressor 11 Oil reservoir 13 Compression mechanism 13a Cylinder 13b Piston 13c Main bearing 13d Sub bearing 13j Fixed Scroll 13k Swivel Scroll 14 Electric motor 16 Accumulator 17 Condenser 18 Pressure reducing device 19 Evaporator 20 rotor 20S Rotor outer surface 30 Stator 31 Stator yoke 32 stator teeth 32A Stator teeth base 32B Stator teeth tip 32S Stator teeth inner surface 32Sa Stator teeth inner tapered surface 33 slots 34 Fixing recess 34a Bottom of fixing recess 41 Windings 42 Insulation material 50 insulator 51 Insulator yoke 52A Insulator tooth base 52B Insulator teeth tip 53 Insulator yoke recess 53a Bottom of recess in insulator yoke 53b Bottom outer periphery 53c Bottom inner circumference 54 Fixing protrusion 54X Base of fixing protrusion 54Y Fixing protrusion protruding part 54Ya tapered part 54Yb straight part 55 Locking protrusion 55a Locking protrusion extension a Radial dimension of the opening side b Depth dimension L gap

Claims

1. a rotor formed by laminating rotor core sheets and having multiple permanent magnets arranged around a rotation axis; a stator formed by laminating stator core sheets and disposed with the rotor via an air gap; insulators arranged on both end surfaces of the stator in the lamination direction; and The stator includes: an annular stator yoke centered on the rotation axis; a plurality of stator teeth extending from the stator yoke toward the rotor; slots formed between the stator teeth; and A winding is disposed in the slot; The stator teeth are a stator tooth base around which the winding is wound; stator tooth tip portions that form inner peripheral surfaces of the stator teeth facing the rotor; and The insulator is an insulator yoke portion located on the stator yoke; an insulator teeth base located at the stator teeth base; an insulator tooth tip portion located at the stator tooth tip portion; a fixing protrusion provided on the insulator yoke portion; and The stator yoke has a fixing recess, the fixing protrusion is raised from a bottom surface of an insulator yoke recess formed in the insulator yoke portion, so that the fixing protrusion is formed by a fixing protrusion root portion located within the insulator yoke recess and a fixing protrusion protruding portion protruding from the insulator yoke recess, An annular groove is formed around the base of the fixing projection by the insulator yoke recess, The fixing protrusion is inserted into the fixing recess to fix the insulator to the stator. An electric motor characterized by:

2. The fixing protrusion protruding portion has: A tapered portion in which the cross-sectional area decreases toward the tip side, a straight portion where the cross-sectional area does not change; and The straight portion is continuous with the base portion of the fixing projection, The tapered portion is longer than the straight portion.

2. The electric motor according to claim 1.

3. The length of the straight portion is equal to or greater than the thickness of one of the stator core sheets.

3. The electric motor according to claim 2.

4. The fixing protrusion is divided into a plurality of pieces.

2. The electric motor according to claim 1.

5. When the fixing protrusion is inserted into the fixing recess, a gap equal to or greater than the thickness of one of the stator core sheets is formed between the fixing protrusion and the bottom surface of the fixing recess.

2. The electric motor according to claim 1.

6. The bottom surface of the insulator yoke recess is flat, and the outer and inner peripheries of the bottom surface of the insulator yoke recess are rounded.

2. The electric motor according to claim 1.

7. When the radial dimension of the opening surface side of the annular groove is a and the depth dimension to the bottom surface of the insulator yoke recess is b, a:b is set in the range of 1:1 to 1:

20.

2. The electric motor according to claim 1.

8. The stator is divided into a plurality of pieces, each of which corresponds to a corresponding one of the stator teeth, and the pieces are arranged in a circular ring shape. The insulator is disposed for each of the stators, The stator teeth have inner peripheral tapered surfaces formed on both sides of the inner peripheral surfaces thereof, so that the air gap gradually widens toward the ends thereof. The insulator teeth have end portions formed with locking projections that come into contact with the inner peripheral tapered surfaces of the stator teeth.

2. The electric motor according to claim 1.

9. a rotor formed by laminating rotor core sheets and having multiple permanent magnets arranged around a rotation axis; a stator formed by laminating stator core sheets and disposed with the rotor via an air gap; insulators arranged on both end surfaces of the stator in the lamination direction; and The stator includes: an annular stator yoke centered on the rotation axis; a plurality of stator teeth extending from the stator yoke toward the rotor; slots formed between the stator teeth; and A winding is disposed in the slot; The stator teeth are a stator tooth base around which the winding is wound; stator tooth tip portions that form inner peripheral surfaces of the stator teeth facing the rotor; and The insulator is an insulator yoke portion located on the stator yoke; an insulator teeth base located at the stator teeth base; an insulator tooth tip portion located at the stator tooth tip portion; a fixing protrusion provided on the insulator yoke portion; and The stator is divided into a plurality of pieces, each of which corresponds to a corresponding one of the stator teeth, and the pieces are arranged in a circular ring shape. The insulator is disposed for each of the stators, The stator yoke has a fixing recess, an electric motor in which the insulator is fixed to the stator by inserting the fixing protrusion into the fixing recess, The stator teeth have inner peripheral tapered surfaces formed on both sides of the inner peripheral surfaces thereof, so that the air gap gradually widens toward the ends thereof. The insulator teeth have end portions formed with locking projections that come into contact with the inner peripheral tapered surfaces of the stator teeth. An electric motor characterized by:

10. A compressor using the electric motor according to any one of claims 1 to 9, A compression mechanism is connected to the rotary shaft, The refrigerant is compressed by the compression mechanism. A compressor characterized by:

11. An apparatus using the compressor according to claim 10, The compressor, the condenser, the pressure reducing device, and the evaporator are connected in a ring shape by piping. The device characterized by:

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