Electric motor, compressor and device

Abstract

The invention provides an electric motor (14), a compressor (10) using the electric motor (14), and a device using the compressor (10), a stator side small hole (80) is formed in a stator tooth front end portion (32B), and a stator side small hole (80) is formed in a stator tooth front end portion (32B). A pair of stator tooth base side surfaces forming the stator tooth base (32A) is used as a front stator tooth base side surface (32AF) located in the direction of rotation of the rotor (20) and a rear stator tooth base side surface (32AR) located in the direction opposite to the direction of rotation of the rotor (20). The stator-side small holes (80) are disposed within a range of 1 / 3T width from a rear stator tooth base side surface (32AR), the front magnetic flux blocking portion (60F) is made longer than the rear magnetic flux blocking portion (60R), rotor-side front small holes (70F) are formed at the rear end of the front magnetic flux blocking portion (60F), and rotor-side rear small holes (70R) are formed at the front end of the rear magnetic flux blocking portion (60R), whereby high efficiency can be maintained, and the rotor-side small holes (70F, 70R) are formed at the rear end of the rear magnetic flux blocking portion (60R). The electromagnetic force in the radial direction can be suppressed, and torque fluctuation, which is torque unevenness in the rotational direction, can be suppressed at the same time.

Description

Technical Field

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

[0002] Patent Document 1 proposes the following electric motor: By providing a magnetic saturation promoting unit in the rotor to facilitate saturation, it is possible to reduce the unbalanced magnetic attraction force generated between the rotor and the stator, suppress the shaft deflection of the shaft, and appropriately drive the compression mechanism.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-162379 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In Patent Document 1, a reluctance portion is arranged on the rotation direction side of the rotor to reduce the radial electromagnetic force, that is, the unbalanced magnetic attraction force, suppress the shaft deflection of the shaft, and appropriately drive the compression mechanism. However, the torque fluctuation of the rotational unevenness of the electric motor tends to increase.

[0008] Therefore, an object of the present invention is to provide an electric motor that can maintain high efficiency and at the same time achieve suppression of the radial electromagnetic force and suppression of the torque fluctuation of the torque unevenness in the rotation direction, a compressor using the electric motor, and a device using the compressor.

[0009] Means for Solving the Problems

[0010] The motor 14 of the present invention described in Technical Solution 1 is characterized in that it has: a rotor 20 with a plurality of permanent magnets 22 arranged around a rotating shaft 4; and a stator 30 arranged with a gap from the above-mentioned rotor 20. The stator 30 has an annular stator yoke 31 centered on the above-mentioned rotating shaft 4, a plurality of stator teeth 32 extending from the stator yoke 31 to the rotor 20, and slots 33 formed between the stator teeth 32. Windings are arranged in the slots 33. The stator teeth 32 have a stator tooth base 32A around which the winding is wound and a stator tooth tip 32B forming an inner circumferential surface 32S of the stator tooth opposite to the rotor 20. The rotor 20 has a flux barrier 60 extending from both ends of the permanent magnet 22 to the magnetic pole center of the permanent magnet 22. The flux barrier 60 is formed along the outer circumferential surface 20S of the rotor 20 and is arranged on the stator 30 side relative to the permanent magnet 22. As the flux barrier 60, there is a front flux barrier 60F formed in the rotation direction of the rotor 20 and a rear flux barrier 60R formed in the reverse rotation direction of the rotor 20. A stator side small hole 80 is formed in the stator tooth tip 32B. Taking a pair of stator tooth base sides forming the stator tooth base 32A as a front stator tooth base side 32AF located in the above-mentioned rotation direction of the rotor 20 and a rear stator tooth base side 32AR located in the above-mentioned reverse rotation direction of the rotor 20, when the circumferential width of the stator tooth base 32A is set to T, the stator side small hole 80 is arranged in a range of 1 / 3T in width starting from the rear stator tooth base side 32AR, making the front flux barrier 60F longer than the rear flux barrier 60R. A rotor side front small hole 70F is formed at the rear end of the front flux barrier 60F, and a rotor side rear small hole 70R is formed at the front end of the rear flux barrier 60R.

[0011] The present invention described in Technical Solution 2 is characterized in that in the motor 14 described in Technical Solution 1, if the front flux barrier 60F is formed within an angle α range with respect to the center of the rotating shaft 4, and the number of poles of the rotor 20 is set to P, the angle α is formed within a range of 4 ≤ α ≤ 120 / P with the center between poles as a reference.

[0012] The present invention described in Technical Solution 3 is characterized in that in the motor 14 described in Technical Solution 1, the stator side small hole 80, the rotor side front small hole 70F, and the rotor side rear small hole 70R are formed as voids.

[0013] The present invention described in Technical Solution 4 is characterized in that in the motor 14 described in Technical Solution 1, the stator side small hole 80, the rotor side front small hole 70F, and the rotor side rear small hole 70R are formed as circles.

[0014] The feature of the present invention described in Technical Solution 5 is that in the motor 14 described in Technical Solution 1, the dimension L from the inner peripheral surface 32S of the stator tooth to the stator-side small hole 80 at the front end portion 32B of the stator tooth is made smaller than the diameter of the stator-side small hole 80.

[0015] The feature of the present invention described in Technical Solution 6 is that in the motor 14 described in Technical Solution 1, the dimension M from the outer peripheral surface 20S of the rotor to the front rotor-side small hole 70F is made smaller than the diameter of the front rotor-side small hole 70F.

[0016] The feature of the present invention described in Technical Solution 7 is that in the motor 14 described in Technical Solution 1, the dimension N from the outer peripheral surface 20S of the rotor to the rear rotor-side small hole 70R is made smaller than the diameter of the rear rotor-side small hole 70R.

[0017] The feature of the present invention described in Technical Solution 8 is that in the motor 14 described in Technical Solution 1, the dimension Q from the outer peripheral surface 20S of the rotor to the magnetic flux blocking portion 60 is made smaller than the radial width of the magnetic flux blocking portion 60.

[0018] The feature of the present invention described in Technical Solution 9 is that in the motor 14 described in Technical Solution 1, the stator-side small hole 80 is provided as one, and the front rotor-side small hole 70F and the rear rotor-side small hole 70R are respectively provided as two.

[0019] The compressor 10 of the present invention described in Technical Solution 10 is a compressor 10 using the motor 14 described in Technical Solutions 1 to 9, and is characterized in that a compression mechanism portion 13 is connected to the rotating shaft 4, and the refrigerant is compressed by the compression mechanism portion 13.

[0020] The device of the present invention described in Technical Solution 11 is a device using the compressor 10 described in Technical Solution 10, and is characterized in that the compressor 10, a condenser 17, a decompression device 18, and an evaporator 19 are connected in a ring shape through pipes.

[0021] Advantages of the Invention

[0022] According to the present invention, high efficiency can be maintained, and suppression of radial electromagnetic force and suppression of torque unevenness in the rotation direction, i.e., torque ripple, can be achieved simultaneously. Description of the Drawings

[0023] Figure 1 It is a structural diagram of a compressor using a motor according to an embodiment of the present invention and a refrigeration device using the compressor.

[0024] Figure 2 It is a structural diagram of the main part of the motor of this embodiment.

[0025] Figure 3 It is an explanatory diagram showing the effects of the motor of the present invention.

[0026] Figure 4 It is a contour map of magnetic flux density of the present invention and a comparative example.

[0027] Figure 5 It is a graph showing the magnetic flux density in the gap when the electromagnetic force of the present invention and the comparative example is maximum.

[0028] Figure 6 It is a structural diagram of a scroll compressor using the motor of this embodiment and a refrigeration device using the scroll compressor. Detailed implementation mode

[0029] For the motor of the first embodiment of the present invention, a stator-side small hole is formed at the front end of the stator tooth, and a pair of stator tooth base side surfaces forming the stator tooth base are used as the front stator tooth base side surface in the rotation direction of the rotor and the rear stator tooth base side surface in the reverse rotation direction of the rotor. When the circumferential width of the stator tooth base is set to T, the stator-side small hole is arranged within a range of 1 / 3T in width from the rear stator tooth base side surface, the front magnetic flux blocking portion is made longer than the rear magnetic flux blocking portion, a rotor-side front small hole is formed at the rear end of the front magnetic flux blocking portion, and a rotor-side rear small hole is formed at the front end of the rear magnetic flux blocking portion. According to this embodiment, high efficiency can be maintained, and suppression of the electromagnetic force in the radial direction and suppression of the torque unevenness in the rotation direction, that is, torque ripple, can be achieved simultaneously.

[0030] For the second embodiment of the present invention, in the motor of the first embodiment, the front magnetic flux blocking portion is formed within an angle α range with respect to the center of the rotation axis, and when the number of poles of the rotor is set to P, the angle α is formed within a range of 4 ≤ α ≤ 120 / P with the center between the poles as a reference. According to this embodiment, a magnetic flux blocking portion suitable for the number of poles of the rotor can be formed.

[0031] For the third embodiment of the present invention, in the motor of the first embodiment, the stator-side small hole, the rotor-side front small hole, and the rotor-side rear small hole are formed as voids. According to this embodiment, the productivity is excellent.

[0032] For the fourth embodiment of the present invention, in the motor of the first embodiment, the stator-side small hole, the rotor-side front small hole, and the rotor-side rear small hole are formed as circles. According to this embodiment, the productivity is excellent.

[0033] The fifth embodiment of the present invention is that in the motor of the first embodiment, the dimension L from the inner peripheral surface of the stator tooth at the front end of the stator tooth to the stator side small hole is made smaller than the diameter of the stator side small hole. According to this embodiment, the reduction effect of the magnetic flux density in the air gap between the rotor and the stator can be improved.

[0034] The sixth embodiment of the present invention is that in the motor of the first embodiment, the dimension M from the outer peripheral surface of the rotor to the front small hole on the rotor side is made smaller than the diameter of the front small hole on the rotor side. According to this embodiment, the reduction effect of the magnetic flux density in the air gap between the rotor and the stator can be improved.

[0035] The seventh embodiment of the present invention is that in the motor of the first embodiment, the dimension N from the outer peripheral surface of the rotor to the rear small hole on the rotor side is made smaller than the diameter of the rear small hole on the rotor side. According to this embodiment, the reduction effect of the magnetic flux density in the air gap between the rotor and the stator can be improved.

[0036] The eighth embodiment of the present invention is that in the motor of the first embodiment, the dimension Q from the outer peripheral surface of the rotor to the magnetic flux blocking portion is made smaller than the radial width of the magnetic flux blocking portion. According to this embodiment, the reduction effect of the magnetic flux density in the air gap between the rotor and the stator can be improved.

[0037] The ninth embodiment of the present invention is that in the motor of the first embodiment, one stator side small hole is provided, and two front small holes on the rotor side and two rear small holes on the rotor side are respectively provided. According to this embodiment, the variation range of the radial electromagnetic force can be reduced, and the torque fluctuation can be significantly reduced.

[0038] The compressor of the tenth embodiment of the present invention is a compressor using the motor of any one of the first to ninth embodiments, and a compression mechanism portion is connected to the rotating shaft, and the refrigerant is compressed by the compression mechanism portion. According to this embodiment, a compressor based on low vibration can be realized.

[0039] The device of the eleventh embodiment of the present invention is a device using the compressor of the tenth embodiment, and the compressor, the condenser, the pressure reducing device, and the evaporator are connected in a ring shape through pipes. According to this embodiment, a low-noise and high-efficiency device based on low vibration can be realized without reducing the torque.

[0040]

Example

[0041] Hereinafter, a compressor according to an embodiment of the present invention will be described. In addition, the present invention is not limited to the following embodiments.

[0042] Figure 1 It is a structural diagram of a compressor using the motor of this embodiment and a refrigeration device using this compressor. The compressor of this embodiment represents a rotary compressor.

[0043] An intake pipe 2 for sucking refrigerant and a discharge pipe 3 for discharging refrigerant are connected to a closed container 1. Inside the closed container 1, a compression mechanism section 13 for compressing the refrigerant sucked from the intake pipe 2 and a motor 14 for driving the compression mechanism section 13 are arranged. The bottom inside the closed container 1 forms an oil storage section 11.

[0044] The compression mechanism section 13 is composed of a cylinder 13a, a piston 13b, a vane (not shown), a main bearing 13c, and a sub-bearing 13d. The cylinder 13a is fixed to the closed container 1. The piston 13b is fitted in an eccentric portion 4a of a rotating shaft 4 penetrating through the cylinder 13a in a freely rotatable manner. The vane reciprocates in a vane groove following the piston 13b that rotates along the inner wall surface of the cylinder 13a. The main bearing 13c and the sub-bearing 13d seal the upper and lower end surfaces of the cylinder 13a and support the rotating shaft 4.

[0045] The motor 14 is composed of a stator 30 fixed to the closed container 1 and a rotor 20 arranged on the inner periphery of the stator 30.

[0046] The refrigerant is sucked from the intake pipe 2 into the compression mechanism section 13 and compressed by the compression mechanism section 13. After that, the refrigerant passes through the motor 14 and is discharged from the discharge pipe 3.

[0047] In the refrigeration device of this embodiment, a compressor 10, a condenser 17, a decompression device 18, and an evaporator 19 are connected in a ring shape through pipes. The refrigerant discharged from the discharge pipe 3 is condensed in the condenser 17, the refrigerant condensed by the condenser 17 is decompressed in the decompression device 18, and the refrigerant decompressed by the decompression device 18 is evaporated in the evaporator 19.

[0048] The refrigerant evaporated by the evaporator 19 returns to the compressor 10 via an accumulator 16.

[0049] Figure 1 In the compressor 10 shown, only bearings (main bearing 13c, sub-bearing 13d) bear one end (lower end) side of the rotating shaft 4, so shaft deflection is likely to occur on the other end (upper end) side of the rotating shaft 4. Therefore, the effect of reducing vibration of the motor 14, which can simultaneously suppress the radial electromagnetic force and the torque unevenness in the rotation direction, i.e., torque fluctuation, is high.

[0050] Figure 2 is a main part structure diagram of the motor of this embodiment, Figure 2 (a) is a main part structure diagram showing the stator and the rotor, Figure 2 (b) is a main part structure diagram showing the rotor, Figure 2 (c) is Figure 2 (a) main part enlarged view.

[0051] In this embodiment, the rotor 20 is fixed to the rotating shaft 4, and the stator 30 is fixed to the closed container 1. Additionally, in this embodiment, a motor 14 with a pole number P of 6 poles is shown.

[0052] In addition, Figure 2 (a) The arrow shown indicates the rotation direction of the rotor 20. In this embodiment, the rotor 20 rotates counterclockwise.

[0053] The rotor 20 includes: a rotor core 21 formed by laminating rotor iron core sheets into a cylindrical shape; and permanent magnets 22 disposed in gaps formed in the outer peripheral portion of the rotor core 21. The rotor 20 is provided with a plurality of permanent magnets 22 centered on the rotating shaft 4.

[0054] The rotor iron core sheets are electromagnetic steel sheets with a thickness of about 0.3 mm, and the rotor core 21 is made of a magnetic material.

[0055] The rotor core 21 has a through-hole 23 for disposing the rotating shaft 4 at the center portion, and a plurality of rotor refrigerant passages 24 are provided around the through-hole 23 in the axial direction. A plurality of rotor refrigerant passages 24 are formed concentrically between the through-hole 23 and the permanent magnets 22.

[0056] The rotor 20 has a flux barrier portion 60 that extends from both ends of the permanent magnet 22 toward the magnetic pole center of the permanent magnet 22 with a predetermined width. The flux barrier portion 60 is a magnetic resistance portion formed by a gap continuous with the gap in which the permanent magnet 22 is disposed. Additionally, the flux barrier portion 60 is a portion for increasing the magnetic resistance, and as long as it is non-magnetic, the effect is high, and resin can also be embedded.

[0057] The flux barrier portion 60 is formed in an arc shape along the outer peripheral surface 20S of the rotor 20 and is disposed on the stator side with respect to the permanent magnet 22. As the flux barrier portion 60, there is a front flux barrier portion 60F formed in the forward rotation direction of the rotor 20 and a rear flux barrier portion 60R formed in the reverse rotation direction of the rotor 20.

[0058] The front flux barrier portion 60F is formed in the range of an angle α with respect to the center of the rotating shaft 4 based on the center between poles, and the rear flux barrier portion 60R is formed in the range of an angle β with respect to the center of the rotating shaft 4 based on the center between poles.

[0059] Here, the angle α is greater than the angle β. That is, the front flux barrier portion 60F is formed longer than the rear flux barrier portion 60R.

[0060] When the pole number of the rotor 20 is set as P, the angle α for forming the front flux barrier portion 60F is set in the range of 4 ≤ α ≤ 120 / P with respect to the center between poles.

[0061] By making the dimension Q from the outer peripheral surface 20S of the rotor to the magnetic flux barrier portion 60 smaller than the radial width of the magnetic flux barrier portion 60, the effect of reducing the magnetic flux density in the air gap between the rotor 20 and the stator 30 can be improved.

[0062] A rotor-side front small hole 70F is formed at the rear end of the front magnetic flux barrier portion 60F, and a rotor-side rear small hole 70R is formed at the front end of the rear magnetic flux barrier portion 60R. The rotor-side front small hole 70F and the rotor-side rear small hole 70R are preferably two each. The rotor-side front small hole 70F and the rotor-side rear small hole 70R increase the magnetic resistance, and as long as they are non-magnetic, the effect is high. They can also be filled with resin, but are preferably voids. Thus, by making the rotor-side front small hole 70F and the rotor-side rear small hole 70R voids, the productivity is excellent.

[0063] By making the dimension M from the outer peripheral surface 20S of the rotor to the rotor-side front small hole 70F smaller than the diameter of the rotor-side front small hole 70F, the effect of reducing the magnetic flux density in the air gap between the rotor 20 and the stator 30 can be improved.

[0064] In addition, by making the dimension N from the outer peripheral surface 20S of the rotor to the rotor-side rear small hole 70R smaller than the diameter of the rotor-side rear small hole 70R, the effect of reducing the magnetic flux density in the air gap between the rotor 20 and the stator 30 can be improved.

[0065] Furthermore, it is preferable that the dimension Q from the outer peripheral surface 20S of the rotor to the magnetic flux barrier portion 60, the dimension M from the outer peripheral surface 20S of the rotor to the rotor-side front small hole 70F, and the dimension N from the outer peripheral surface 20S of the rotor to the rotor-side rear small hole 70R are the same.

[0066] The stator 30 and the rotor 20 are arranged with an air gap therebetween. The stator 30 is formed by laminating stator iron cores in the axial direction of the rotating shaft 4. The stator iron core is an electromagnetic steel sheet with a thickness of about 0.3 mm, and the stator 30 is made of a magnetic material.

[0067] 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 (not shown) is disposed in the slots 33.

[0068] In addition, the stator 30 in the present embodiment is formed by arranging segmented stators divided into a plurality of segments for each stator tooth 32 in a circular ring shape.

[0069] The stator tooth 32 has a stator tooth base portion 32A around which a winding (not shown) is wound via an insulating material (not shown), and a stator tooth front end portion 32B formed at the front end of the stator tooth base portion 32A.

[0070] The front end portion 32B of the stator tooth forms an inner peripheral surface 32S of the stator tooth that faces the outer peripheral surface 20S of the rotor 20.

[0071] The front end portion 32B of the stator tooth is formed to protrude more to both sides than the circumferential width T of the stator tooth base portion 32A. On both side portions of the inner peripheral surface 32S of the stator tooth formed to protrude in this way, a stator tooth inner peripheral conical surface 32Sa is formed in which the air gap gradually expands toward the end portion.

[0072] A stator-side small hole 80 is formed in the front end portion 32B of the stator tooth. The stator-side small hole 80 is a structure for increasing the magnetic resistance, and as long as it is non-magnetic, the effect is high, and it can be filled with resin, but a void is preferred. In this way, by making the stator-side small hole 80 a void, the productivity is excellent.

[0073] If a pair of stator tooth base side surfaces forming the stator tooth base portion 32A are a front stator tooth base side surface 32AF located in the rotation direction of the rotor 20 and a rear stator tooth base side surface 32AR located in the reverse rotation direction of the rotor 20, the stator-side small hole 80 is arranged in a range of width 1 / 3T starting from the rear stator tooth base side surface 32AR. More preferably, the stator-side small hole 80 is in a range of width 1 / 4T starting from the rear stator tooth base side surface 32AR. In addition, the stator-side small hole 80 is not arranged along the stator tooth inner peripheral conical surface 32Sa, but along the inner peripheral surface 32S of the stator tooth that forms a certain air gap. In addition, the circumferential width T of the stator tooth base portion 32A is between the front stator tooth base side surface 32AF and the rear stator tooth base side surface 32AR.

[0074] By making the dimension L from the inner peripheral surface 32S of the stator tooth at the front end portion 32B of the stator tooth to the stator-side small hole 80 smaller than the diameter of the stator-side small hole 80, the effect of reducing the magnetic flux density in the air gap between the rotor 20 and the stator 30 can be improved.

[0075] In addition, the dimension L from the inner peripheral surface 32S of the stator tooth to the stator-side small hole 80 is preferably the same as the dimension Q from the outer peripheral surface 20S of the rotor to the magnetic flux blocking portion 60, the dimension M from the outer peripheral surface 20S of the rotor to the front rotor-side small hole 70F, and the dimension N from the outer peripheral surface 20S of the rotor to the rear rotor-side small hole 70R.

[0076] In addition, the diameter of the stator-side small hole 80 is preferably the same as the diameter of the front rotor-side small hole 70F and the diameter of the rear rotor-side small hole 70R.

[0077] In addition, in this embodiment, the stator-side small hole 80, the front rotor-side small hole 70F, and the rear rotor-side small hole 70R are formed as circular, but they can also be elliptical or polygonal.

[0078] Figure 3 It is an explanatory diagram showing the effects of the motor of the present invention.

[0079] In the motor 14 of the present invention, the motor 14 described in Figure 2 is used. As a comparative example, the motor 14 shown in Figure 3 (c) is used.

[0080] In Figure 3 the motor shown in (c), the stator-side small hole 80 and the rotor-side rear small hole 70R are not formed. Further, in Figure 3 the motor 14 shown in (c), the front magnetic flux blocking portion 60F is formed to have the same length as the rear magnetic flux blocking portion 60R. Figure 3 Other aspects of the motor 14 shown in (c) are the same as those of the motor 14 shown in Figure 2 .

[0081] Figure 3 (a) shows the electromagnetic force acting as a radial force. The present invention can reduce the amplitude value by 7.6% compared with the comparative example.

[0082] Figure 3 (b) shows the torque variation. The present invention can reduce the torque fluctuation by 50% compared with the comparative example.

[0083] In addition, the motor 14 of the present invention maintains the same efficiency as the comparative example.

[0084] Figure 4 is the magnetic flux density contour map of the present invention and the comparative example.

[0085] Figure 4 (a) is the stator shown in Figure 2 , Figure 4 (b) is the rotor shown in Figure 2 , Figure 4 (c) is the stator shown in Figure 3 (c), Figure 4 (d) is the rotor shown in Figure 3 (c).

[0086] In Figure 4 , when the magnetic flux density at the same value of the electromagnetic force acting as a radial force is shown, it can be seen that the effects caused by the front magnetic flux blocking portion 60F, the rotor-side front small hole 70F, the rotor-side rear small hole 70R, and the stator-side small hole 80 are generated.

[0087] Figure 5 is a graph showing the magnetic flux density in the gap when the electromagnetic force of the present invention and the comparative example is maximum.

[0088] As shown in Figure 5 , the present invention can reduce the gap magnetic flux density within one pitch by 2.7% compared with the comparative example.

[0089] Figure 6 It is a structural diagram of a scroll compressor using the motor of this embodiment and a refrigeration apparatus using the scroll compressor.

[0090] The compressor 10 of this embodiment has a compression mechanism portion 13 that compresses refrigerant gas and a motor 14 that drives the compression mechanism portion 13 in a sealed container 1.

[0091] The inside of the sealed container 1 is divided into one container inner space and another container inner space by the compression mechanism portion 13. And the motor 14 is disposed in the other container inner space.

[0092] In addition, the other container inner space is divided into a compression mechanism side space and an oil storage side space by the motor 14. The oil storage portion 11 is disposed in the oil storage side space.

[0093] The suction pipe 2 and the discharge pipe 3 are fixed to the sealed container 1 by welding. The suction pipe 2 and the discharge pipe 3 are connected to components constituting a refrigeration cycle outside the sealed container 1. The suction pipe 2 introduces refrigerant gas from outside the sealed container 1, and the discharge pipe 3 discharges refrigerant gas from one container inner space to the outside of the sealed container 1.

[0094] The main bearing member 7a is fixed to the inside of the sealed container 1 by welding, shrink fitting, etc., and axially supports the rotating shaft 4. One side of the rotating shaft 4 is axially supported by the main bearing member 7a, and the other side is axially supported by the bearing 7b. The fixed scroll member 13j is bolted to the main bearing member 7a. The orbiting scroll member 13k meshing with the fixed scroll member 13j is sandwiched between the main bearing member 7a and the fixed scroll member 13j. The fixed scroll member 13j and the orbiting scroll member 13k constitute the scroll type compression mechanism portion 13.

[0095] An autorotation restricting mechanism 9 composed of a cross slip ring or the like is provided between the orbiting scroll member 13k and the main bearing member 7a. The autorotation restricting mechanism 9 prevents the autorotation of the orbiting scroll member 13k and guides the orbiting scroll member 13k to perform a circular orbit motion. The orbiting scroll member 13k is eccentrically driven by an eccentric portion 4a provided at the upper end of the rotating shaft 4. By this eccentric drive, the compression chamber formed between the fixed scroll member 13j and the orbiting scroll member 13k moves from the outer periphery of the compression mechanism portion 13 toward the central portion, reducing the volume to perform compression.

[0096] The motor 14 has a rotor 20 rotatably disposed around the rotating shaft 4 and a stator 30 disposed with a gap from the rotor 20. In addition, regarding the structure of the motor 14, since it is the same as Figure 2 the description is omitted.

[0097] Refrigerant is sucked into the compression mechanism portion 13 from the suction pipe 2 and compressed by the compression mechanism portion 13. After that, the refrigerant is discharged from the discharge pipe 3.

[0098] In the refrigeration device of this embodiment, the compressor 10, the condenser 17, the decompression device 18, and the evaporator 19 are connected in a loop by piping. The refrigerant discharged from the discharge pipe 3 is condensed in the condenser 17, the refrigerant condensed by the condenser 17 is decompressed in the decompression device 18, and the refrigerant decompressed by the decompression device 18 is evaporated in the evaporator 19.

[0099] The refrigerant evaporated in the evaporator 19 returns from the suction pipe 2 to the compressor 10.

[0100] Figure 6 The shown compressor 10 supports one end (lower end) of the rotating shaft 4 by the bearing 7b, and the other end (upper end) of the rotating shaft 4 is supported by the main bearing member 7a. Therefore, shaft deflection is not easily generated, but the vibration from the motor 14 is easily transmitted to the closed container 1. Therefore, the effect of reducing the vibration of the motor 14 that can simultaneously suppress the radial electromagnetic force and the torque unevenness in the rotation direction, that is, the torque fluctuation, is relatively high.

[0101] As Figure 1 and Figure 6 shown, the motor 14 of this embodiment is suitable for a compressor 10 that connects the compression mechanism portion 13 to the rotating shaft 4 and compresses the refrigerant through the compression mechanism portion 13.

[0102] In addition, in this embodiment, a vertical compressor 10 has been described, but even a horizontal compressor 10 has the same effect and is also suitable for, for example, a vehicle-mounted compressor. In addition, Figure 1 shows a rotary compressor, and Figure 6 shows a scroll compressor, but it can also be a reciprocating compressor or other compressors.

[0103] In a vehicle-mounted compressor, particularly low noise is required. Therefore, by using the motor 14 of this embodiment that can simultaneously suppress the radial electromagnetic force and the rotational unevenness, that is, the torque fluctuation, there is a remarkable effect of achieving low noise through low vibration.

[0104] In addition, in a refrigeration device in which the compressor 10 using the motor 14 of this embodiment is connected in a loop by piping together with the condenser 17, the decompression device 18, and the evaporator 19, low noise and high efficiency based on low vibration can be achieved without reducing the torque.

[0105] As described above, in the motor 14 of the present embodiment, the stator-side small holes 80 are arranged in the range of 1 / 3T in width starting from the side surface 32AR of the rear stator tooth base, the front magnetic flux blocking portion 60F is made longer than the rear magnetic flux blocking portion 60R, the rotor-side front small hole 70F is formed at the rear end of the front magnetic flux blocking portion 60F, and the rotor-side rear small hole 70R is formed at the front end of the rear magnetic flux blocking portion 60R. Thus, high efficiency can be maintained, and suppression of the electromagnetic force in the radial direction and suppression of torque unevenness in the rotation direction, i.e., torque ripple, can be achieved simultaneously.

[0106] In particular, by providing one stator-side small hole 80 and two rotor-side front small holes 70F and two rotor-side rear small holes 70R respectively, the variation range of the electromagnetic force in the radial direction can be reduced, and the torque ripple can be significantly reduced.

[0107] In addition, in the present embodiment, the case where the stator 30 divided into a plurality of parts for each stator tooth 32 is arranged in an annular shape is shown, but the same also applies to the integrated stator 30.

[0108] Industrial applicability

[0109] The compressor of the present invention is useful for devices such as a hot water heating device, an indoor air conditioner, a vehicle-mounted air conditioner, a water heater, a refrigerator, a display cabinet, a cooler, or a refrigerator.

[0110] Explanation of reference numerals

[0111] 1 Hermetic container

[0112] 2 Suction pipe

[0113] 3 Discharge pipe

[0114] 4 Rotating shaft

[0115] 4a Eccentric portion

[0116] 7a Main bearing component

[0117] 7b Bearing

[0118] 10 Compressor

[0119] 11 Oil storage portion

[0120] 13 Compression mechanism portion

[0121] 13a Cylinder

[0122] 13b Piston

[0123] 13c Main bearing

[0124] 13d Sub-bearing

[0125] 13j Fixed scroll member

[0126] 13k swirling vortex part

[0127] 14 electric motor

[0128] 16 accumulator

[0129] 17 condenser

[0130] 18 pressure reducing device

[0131] 19 evaporator

[0132] 20 rotor

[0133] 20S outer peripheral surface of rotor

[0134] 21 rotor core

[0135] 22 permanent magnet

[0136] 23 through hole

[0137] 24 rotor refrigerant passage

[0138] 30 stator

[0139] 31 stator yoke

[0140] 32 stator tooth

[0141] 32A base of stator tooth

[0142] 32B tip of stator tooth

[0143] 32AF side surface of front base of stator tooth

[0144] 32AR side surface of rear base of stator tooth

[0145] 32S inner peripheral surface of stator tooth

[0146] 32Sa inner peripheral conical surface of stator tooth

[0147] 33 slot

[0148] 60 magnetic flux blocking part

[0149] 60F front magnetic flux blocking part

[0150] 60R rear magnetic flux blocking part

[0151] 70F front small hole on rotor side

[0152] 70R rear small hole on rotor side

[0153] 80 small hole on stator side

[0154] Dimension L from inner peripheral surface of stator tooth to small hole on stator side

[0155] Dimension M from the outer peripheral surface of the rotor to the small hole in the front side of the rotor

[0156] Dimension N from the outer peripheral surface of the rotor to the small hole in the rear side of the rotor

[0157] Number of poles P

[0158] Dimension Q from the outer peripheral surface of the rotor to the magnetic flux blocking portion

[0159] Circumferential width of the base portion of the stator teeth T.

Claims

1. A motor, characterized in that, comprising: a rotor having a plurality of permanent magnets arranged around a rotation axis; and a stator arranged with a gap from the rotor, the stator having: an annular stator yoke centered on the rotation axis; a plurality of stator teeth extending from the stator yoke toward the rotor; and slots formed between the stator teeth, windings being arranged in the slots, the stator teeth having: a stator tooth base for winding the windings; and a stator tooth tip portion forming an inner circumferential surface of the stator tooth facing the rotor, the rotor having a flux barrier portion extending from both ends of the permanent magnet toward the magnetic pole center of the permanent magnet, the flux barrier portion being formed along the outer circumferential surface of the rotor of the rotor and arranged on the stator side relative to the permanent magnet, as the flux barrier portion, having a front flux barrier portion formed in the rotation direction of the rotor and a rear flux barrier portion formed in the reverse rotation direction of the rotor, wherein a stator side small hole is formed in the stator tooth tip portion, when a pair of stator tooth base side surfaces forming the stator tooth base are defined as a front stator tooth base side surface located in the rotation direction of the rotor and a rear stator tooth base side surface located in the reverse rotation direction of the rotor, and the circumferential width of the stator tooth base is defined as T, the stator side small hole is arranged in a range of 1 / 3T in width from the rear stator tooth base side surface, the front flux barrier portion is longer than the rear flux barrier portion, a rotor side front small hole is formed at the rear end of the front flux barrier portion, a rotor side rear small hole is formed at the front end of the rear flux barrier portion.

2. The motor according to claim 1, characterized in that: when the center of the front flux barrier portion with respect to the rotation axis is formed within an angle α range, and the number of poles of the rotor is defined as P, the angle α is formed within a range of 4 ≤ α ≤ 120 / P with reference to the center between poles.

3. The motor according to claim 1, characterized in that: the stator side small hole, the rotor side front small hole, and the rotor side rear small hole are formed as voids.

4. The motor according to claim 1, characterized in that: the stator side small hole, the rotor side front small hole, and the rotor side rear small hole are formed as circles.

5. The motor according to claim 1, characterized in that: the dimension L from the inner circumferential surface of the stator tooth tip portion of the stator tooth to the stator side small hole is smaller than the diameter of the stator side small hole.

6. The motor according to claim 1, characterized in that: the dimension M from the outer circumferential surface of the rotor to the rotor side front small hole is smaller than the diameter of the rotor side front small hole.

7. The motor according to claim 1, characterized in that: the dimension N from the outer circumferential surface of the rotor to the rotor side rear small hole is smaller than the diameter of the rotor side rear small hole.

8. The motor according to claim 1, characterized in that: the dimension Q from the outer circumferential surface of the rotor to the flux barrier portion is smaller than the radial width of the flux barrier portion.

9. The motor according to claim 1, characterized in that: There is one small hole on the stator side, and there are two small holes in front of the rotor side and two small holes behind the rotor side respectively.

10. A compressor, characterized in that: It uses the motor described in any one of claims 1 to 9, A compression mechanism part is connected to the rotating shaft, And the refrigerant is compressed by the compression mechanism part.

11. A device, characterized in that: It uses the compressor described in claim 10, The compressor, condenser, pressure reducing device and evaporator are connected in a ring by piping.

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