Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K3/00—Details of windings
  • H02K3/32—Windings characterised by the shape, form or construction of the insulation
  • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K3/00—Details of windings
  • H02K3/46—Fastening of windings on the stator or rotor structure

Definitions

• the present invention relates to an electric motor, a compressor using this electric motor, and equipment using this compressor.
• the electric motor described in Patent Document 1 has a fitting hole in the back yoke of the stator to reduce the effect on magnetic performance, and the insulator is attached to the stator by fitting a protrusion on the insulator into the hole in the back yoke.
• the insulator is rotated, and the end faces of the stator and insulator are located away from the fitting hole in the back yoke to prevent a reduction in winding space.
• the insulator is attached to the stator at a location where both end faces of the stator and insulator are separated from the fitting hole in the back yoke.
• the present invention aims to provide a highly efficient, low-vibration motor, a compressor using this motor, and equipment using this compressor, which prevents shavings from getting between the insulator and the stator during assembly of the motor, causing the insulator to lift off the stator, and prevents problems caused by shavings getting into the gaps between the stator and rotor after assembly of the motor.
• the electric motor 14 of the present invention described in claim 1 includes 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 an insulator 50 arranged on both end faces of the stator 30 in the lamination direction,
• the stator 30 includes 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, a winding 41 is arranged in the slot 33
• the stator teeth 32 include a stator teeth base portion 32A around which the winding 41 is wound, and a stator teeth tip portion 32B forming a stator teeth inner circumferential surface 32S facing the rotor 20
• the insulator 50 includes an insulator yoke portion 51 located on the stator yoke 31,
• the stator yoke 31 has a fixing recess 34, wherein 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, and 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 root 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 projection 54 is divided into a plurality of parts.
• the present invention described in claim 5 is characterized in that, in the electric motor 14 described in claim 1, when the fixing protrusion protrusion portion 54Y is inserted into the fixing recess 34, a gap L greater than or equal to the thickness of one of the stator core sheets is formed between the fixing protrusion protrusion portion 54Y and the fixing recess bottom surface 34a of the fixing recess 34.
• the present invention as set forth in claim 6 is characterized in that, in the electric motor 14 as set forth in claim 1, the bottom surface 53a of the insulator yoke recess is a flat surface, and the bottom outer peripheral portion 53b and the bottom inner peripheral portion 53c of the insulator yoke recess bottom surface 53a are R-shaped.
• the present invention as set forth in claim 7 is characterized in that, in the electric motor 14 as set forth in 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 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 circumferential tapered surfaces 32Sa are formed on both sides of the stator tooth inner circumferential surface 32S, and the air gap gradually expands toward the ends, and the insulator tooth tip portions 52B are formed with locking protrusions 55 that abut against the stator tooth inner circumferential tapered surfaces 32Sa.
• the electric motor 14 of the present invention as set forth in claim 9 includes 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 an insulator 50 arranged on both end faces of the stator 30 in the lamination direction, the stator 30 includes 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, a winding 41 is arranged in the slot 33, the stator teeth 32 include a stator teeth base portion 32A around which the winding 41 is wound, and a stator teeth tip portion 32B forming a stator teeth inner peripheral surface 32S facing the rotor 20, and the insulator 50 includes an insulator yoke 31 located on the stator yoke 31.
• the stator 30 has a yoke portion 51, an insulator teeth base portion 52A located at the stator teeth base portion 32A, an insulator teeth tip portion 52B located at the stator teeth tip portion 32B, and a fixing protrusion portion 54 provided on the insulator yoke portion 51.
• the stator 30 is divided into a plurality of pieces for each of the stator teeth 32 and arranged in an annular shape.
• the insulator 50 is arranged for each of the stators 30.
• the stator yoke 31 has a fixing recess 34.
• the electric motor 14 is characterized in that the insulator 50 is fixed to the stator 30 by inserting the fixing protrusion 54 into the fixing recess 34, and a stator tooth inner circumferential tapered surface 32Sa is formed on both sides of the stator tooth inner circumferential surface 32S, in which the air gap gradually expands toward the ends, and a locking protrusion 55 is formed on the insulator tooth tip end 52B, which abuts against the stator tooth inner circumferential tapered surface 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.
• 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 teeth, thereby reliably preventing the insulator from shifting from the stator, particularly when winding the windings around the stator.
• FIG. 1 is a block diagram of a compressor using an electric motor according to an embodiment of the present invention, and a refrigeration device using the compressor.
• FIG. 2 is a perspective view showing a stator and an insulator that constitute the electric motor according to the present embodiment.
• FIG. 1 shows the stator and insulator.
• FIG. 3 is a cross-sectional view showing a fixing protrusion provided on an insulator yoke and a fixing recess provided on a stator yoke.
• the fixing protrusion is raised from the bottom surface of the insulator yoke recess of the insulator yoke formed in the insulator yoke, so that the fixing protrusion is formed by a fixing protrusion root portion located in the insulator yoke recess and a fixing protrusion protruding portion protruding from the insulator yoke recess, and 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.
• the shavings generated when the fixing protrusion protruding portion is scraped by the fixing recess can be retained in the annular groove. Therefore, when the electric motor is assembled, the shavings do not get between the insulator and the stator, causing the insulator to float up from the stator, and after the electric motor is assembled, there is no inconvenience caused by the shavings getting into the gaps between the stator and the rotor, and a highly efficient and low-vibration electric motor can be realized.
• the second embodiment of the present invention is an electric motor according to the first embodiment, in which the protruding portion of the fixing protrusion has a tapered portion whose cross-sectional area decreases toward the tip side and a straight portion whose cross-sectional area does not change, and is connected to the base portion of the fixing protrusion by the straight portion, and the tapered portion is longer than the straight portion.
• the protruding portion of the fixing protrusion can be inserted into the fixing recess by the straight portion, and the tapered portion is located within the fixing recess, so that the springiness of the tapered portion provides excellent vibration resistance and reduces the generation of shavings.
• the third embodiment of the present invention is an electric motor according to the second embodiment, in which the length of the straight portion is set to be equal to or greater than the thickness of one stator core sheet. According to this embodiment, the protruding portion for fixing can be securely inserted into the recess for fixing.
• the fourth embodiment of the present invention is an electric motor according to the first embodiment, in which the fixing protrusion is divided into multiple parts. With 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.
• the fifth embodiment of the present invention is an electric motor according to the first embodiment, in which when the fixing protrusion protruding portion is inserted into the fixing recess, a gap greater than the thickness of one stator core sheet is formed between the fixing protrusion protruding portion and the bottom surface of the fixing recess. According to this embodiment, the insulator can be reliably fixed in close contact with the stator without floating up from the stator.
• the sixth embodiment of the present invention is an electric motor according to the first embodiment, in which the bottom surface of the insulator yoke recess is flat, and the outer and inner periphery of the bottom surface of the insulator yoke recess are rounded. This embodiment is easy to manufacture and reduces the generation of shavings.
• the seventh embodiment of the present invention is an electric motor according to the first embodiment, in which a:b is in the 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.
• a:b is in the 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.
• the eighth embodiment of the present invention is an electric motor according to the first embodiment, in which a stator divided into multiple pieces for each stator tooth is arranged in a circular ring shape, an insulator is arranged for each stator, and an inner circumferential tapered surface of the stator tooth is formed on both sides of the inner circumferential surface of the stator tooth, with the air gap gradually expanding toward the end, and a locking protrusion is formed at the tip of the insulator tooth to abut against the inner circumferential tapered surface of the stator tooth.
• the insulator is fixed to the stator by inserting the locking protrusion into the fixing recess, and the locking protrusion is abutted against the inner circumferential tapered surface of the stator tooth, so that it is possible to reliably prevent the insulator from shifting from the stator, particularly when winding the winding around the stator.
• a stator divided into multiple pieces for each stator tooth is arranged in a circular ring shape, an insulator is arranged for each stator, the stator yoke has a fixing recess, and the insulator is fixed to the stator by inserting a fixing protrusion into the fixing recess.
• a stator tooth inner tapered surface is formed in which the air gap gradually increases toward the end, and a locking protrusion is formed at the tip of the insulator tooth for abutting against the stator tooth inner tapered surface.
• the insulator is fixed to the stator by inserting the fixing protrusion into the fixing recess, and the locking protrusion is abutted against the stator tooth inner tapered surface, so that it is possible to reliably prevent the insulator from shifting from the stator, especially when winding the winding around the stator.
• the compressor according to the tenth embodiment of the present invention is a compressor using an electric motor according to any one of the first to ninth embodiments, and has a compression mechanism connected to a rotating shaft, which compresses the refrigerant. According to this embodiment, a compressor with low vibration can be realized.
• the device according to the eleventh embodiment of the present invention is a device that uses the compressor according to the tenth embodiment, and has a compressor, a condenser, a pressure reducing device, and an evaporator 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.
• the compressor 1 is a configuration diagram of a compressor using an electric motor according to the present embodiment, and a refrigeration system using this compressor.
• the compressor according to the present 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.
• a compression mechanism 13 for compressing the refrigerant drawn through the suction pipe 2 and an electric motor 14 for driving the compression mechanism 13 are arranged inside the sealed container 1.
• 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 rotating 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 rotating shaft 4.
• the electric motor 14 comprises 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 sucked 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.
• 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 .
• FIG. 2A and 2B are diagrams showing the essential configuration of the electric motor according to this embodiment, in which FIG. 2A is a plan view with windings wound, FIG. 2B is a plan view with no windings wound, FIG. 2C is a cross-sectional view taken along line A-A in FIG. 2A, and FIG. 2D is a cross-sectional view taken along line B-Bb in FIG. 2B.
• FIG. 3 is a perspective view showing a stator and an insulator which constitute the electric motor according to this embodiment, and FIG. 4 is a view showing the stator and the insulator.
• the rotor 20 is fixed to the rotating shaft 4
• the stator 30 is fixed to the sealed container 1 (see FIG. 1).
• 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 having a thickness of about 0.3 mm, and the rotor 20 is made of a magnetic material.
• the stator 30 is disposed with an air gap between it and the rotor 20.
• the stator 30 is configured 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 configured of a magnetic material.
• the stator 30 has an annular stator yoke 31 centered on the rotating shaft 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 slot 33.
• the stator yoke 31 has a fixing recess 34 (FIG. 3).
• the stator teeth 32 have a stator teeth base 32A around which a winding 41 (FIGS. 2(a), 2(c)) is wound via insulating material 42 (FIG. 2(c)), and a stator teeth tip 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 the circumferential width T of stator tooth base portion 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.
• insulator 50 has an insulator yoke portion 51 located on stator yoke 31, an insulator teeth base portion 52A located on stator teeth base portion 32A, an insulator teeth tip portion 52B located on stator teeth tip portion 32B, and a fixing protrusion portion 54 provided on insulator yoke portion 51. Further, at the tip end portion 52B of the insulator teeth, a locking projection 55 is formed which abuts against the inner peripheral tapered surface 32Sa of the stator teeth.
• the locking projections 55 are preferably formed on both sides of the insulator tooth tips 52B. Furthermore, the locking projections 55 preferably form locking projection extensions 55a that come into contact with the side surfaces 32Ba of the stator tooth tips 32B.
• the fixing protrusion 54 rises from a bottom surface 53 a of an 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 a plurality of pieces in this way, the springiness of the fixing protrusion 54 can be further increased, and since the fixing protrusion 54 has excellent vibration resistance, the generation of shavings can be reduced.
• insulators 50 are disposed on both end faces of the stator 30 in the lamination direction.
• the stator 30 is divided into a plurality of pieces, each corresponding to a stator tooth 32, and is arranged in an annular shape.
• 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.
• FIG. 5 is a cross-sectional view showing a fixing protrusion provided on the insulator yoke portion and a fixing recess provided on the stator yoke.
• the fixing projection 54 is formed by a fixing projection root portion 54X located within the insulator yoke recess 53 and a fixing projection 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 54Y into the fixing recess 34.
• the protruding portion 54Y for fixing 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, and is continuous with the base portion 54X for fixing 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.
• the straight portion 54Yb allows the fixing protrusion portion 54Y to be inserted into the fixing recess 34, and since the tapered portion 54Ya is positioned within the fixing recess 34, the spring properties of the tapered portion 54Ya provide excellent vibration resistance, thereby reducing the generation of shavings.
• 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 54Y can be inserted into the fixing recess 34 reliably.
• a gap L greater than or equal to 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 portion 54Y of the fixing protrusion is made shorter than the depth of the fixing recess 34.
• the radial dimension of the opening side of the annular groove is a and the depth dimension to the bottom surface 53a of the insulator yoke recess is b, then by setting a:b in the range of 1:1 to 1:20, the generated shavings can be retained in the annular groove.
• a:b is preferably in the range of 1:2 to 1:10, and more preferably in the range of 1:3 to 1:5.
• the depth dimension b By setting the depth dimension b to be equal to or greater than the radial dimension a of the opening side, the shavings generated when the fixing protrusion protruding portion 54Y is scraped by the fixing recess 34 can be retained in the annular groove.
• the fixing protrusion base portion 54X can be made to have spring properties.
• FIG. 5(b) shows the circular portion of FIG. 5(a)
• FIG. 5(c) shows another embodiment of the portion corresponding to FIG. 5(b)
• FIG. 5(d) shows yet another embodiment of the portion corresponding to FIG. 5(b)
• FIG. 5(e) shows yet another embodiment of the portion corresponding to FIG. 5(b).
• FIG. 5B shows an insulator yoke recess bottom surface 53a that is flat, and an outer peripheral portion 53b and an inner peripheral portion 53c of the insulator yoke recess bottom surface 53a are rounded.
• FIG. 5C shows an insulator yoke recess bottom surface 53a being flat, with an outer periphery 53b and an inner periphery 53c of the insulator yoke recess bottom surface 53a being angular.
• FIG. 5D shows an insulator yoke recess bottom surface 53a formed as a flat surface, with an outer peripheral portion 53b and an inner peripheral portion 53c of the 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 into a bullet-shaped concave surface.
• 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, within 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 13.
• An electric motor 14 is disposed in the other container space.
• the space within the other container is divided into a compression mechanism side space and an oil-storage side space by the electric motor 14.
• the oil-storage side space has the oil reservoir 11 disposed therein.
• a suction pipe 2 and a discharge pipe 3 are fixed by welding to the sealed container 1.
• the suction pipe 2 and the discharge pipe 3 lead to the outside of the sealed container 1 and are connected to components that constitute a refrigeration cycle.
• the suction pipe 2 introduces refrigerant gas from the outside of the sealed container 1, and the discharge pipe 3 discharges the refrigerant gas from one of the spaces inside the container to the outside of the sealed container 1.
• the main bearing member 7a is fixed in the sealed container 1 by welding or shrink fitting, 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 the 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 restraining mechanism 9 such as an Oldham ring is provided.
• the rotation restraining 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 rotating 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 the volume and performing compression.
• the electric motor 14 has a rotor 20 that is rotatably arranged around the rotating shaft 4, and a stator 30 that is arranged via an air gap between the rotor 20. Note that the configuration of the electric motor 14 is the same as that shown in FIG. 2, so a description thereof will be omitted.
• the refrigerant is sucked into the compression mechanism 13 through the suction pipe 2 and compressed in the compression mechanism 13.
• the refrigerant is then discharged from the discharge pipe 3.
• 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 .
• one end (lower end) of the rotating shaft 4 is supported by a bearing 7b, and the other end (upper end) of the rotating shaft 4 is supported by a main bearing member 7a, so that axial runout is unlikely to occur.
• vibrations from the electric motor 14 are easily transmitted to the sealed container 1, the effect of reducing vibrations by the electric motor 14, which can simultaneously suppress electromagnetic forces in the radial direction and torque ripple, which is torque unevenness in the rotational direction, is high.
• the electric motor 14 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.
• the vertical compressor 10 is used for explanation, but the horizontal compressor 10 is similarly effective and is suitable for an in-vehicle compressor, for example.
• a rotary compressor is shown in Fig. 1 and a scroll compressor is shown in Fig. 6, a reciprocating compressor or other compressors may be used.
• Low noise is particularly required for vehicle-mounted compressors, so the use of the electric motor 14 according to this embodiment, which can achieve low vibration with high efficiency, is highly effective in reducing noise due to low vibration.
• 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 of 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. Also, 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 stator 30 is divided into multiple pieces, each for each stator tooth 32, and arranged in a circular ring shape, an insulator 50 is arranged for each stator 30, and 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 circumferential tapered surfaces 32Sa in which the air gap gradually expands toward the ends, are formed on both sides of the stator tooth inner circumferential surface 32S, and the insulator tooth tip portions 52B are formed with locking protrusions 55 that abut against the stator tooth inner circumferential tapered surfaces 32Sa, thereby allowing the fixing protrusions 54 to be inserted into the fixing recesses 34.
• the insulator 50 is fixed to the stator 30 and the locking protrusion 55 is abutted against the inner tapered surface 32Sa of the stator teeth, thereby reliably preventing the insulator 50 from shifting from the stator 30, especially when winding the winding 41 around the stator 30.
• the stator 30 divided into a plurality of pieces for each stator tooth 32 is arranged in a circular shape, but the same applies to an integrated stator 30.
• the compressor of the present invention is useful for devices such as hot water heating systems, indoor air conditioners, vehicle air conditioners, water heaters, refrigerators, showcases, chillers, or freezers.

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