JP2010051075A - Axial gap rotating electric machine and compressor using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial gap rotating electric machine which prevents lubricating oil blown up from below from being transmitted into a space of an upper part of a motor, and to provide a compressor using the same. <P>SOLUTION: The axial gap rotating electric machine is rotatably arranged around a rotating shaft, and includes: a rotor 30 having a magnetic pole face 31 around the rotating shaft; a first stator 10 arranged on one side of the rotor 30 in the direction of the rotating shaft with a gap; and a second stator 20 arranged on the other side with a gap. The first stator 10 includes: a substantially disk-shaped first magnetic core 11; a plurality of winding core magnetic cores 12; a first coil 13; and a first core cut part 14. The second stator 20 includes a second magnetic core 21 and a second core cut part 24. The first core cut part 14 is located so that the first core cut part may not overlap the second core cut part 24 in the direction of the rotating shaft. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an axial gap type rotating electrical machine and a compressor using the same.

  2. Description of the Related Art Conventionally, some compressors include an axial gap type motor arranged in a vertical direction in a sealed container and a compression unit driven by the motor. For example, it is disclosed in Patent Document 1.

  The axial gap type motor includes a stator, a rotor disposed on both sides in the axial direction of the stator via an air gap, a shaft that is fixed to the rotor and transmits the rotational force of the rotor to the compression unit, have. The refrigerant gas mainly flows through the passage on the outer peripheral side of the motor and the air gap.

  Further, the lubricating oil contained in the refrigerant gas is blown to the outer peripheral side of the motor by the oil separator. Since the outer peripheral side of the motor is a refrigerant passage, the lubricating oil is supplied from the outer peripheral side of the motor to the refrigerant gas. The flow leads to the downstream side of the motor. For this reason, it becomes difficult to separate the lubricating oil from the refrigerant gas.

  Moreover, in the compressor described in Patent Document 2, an airtight container, a compression unit disposed in the airtight container, an axial gap type motor disposed in the airtight container, and driving the compression unit via a shaft; The motor includes at least a pair of a stator and a rotor that are opposed to each other in the axial direction with an air gap therebetween. At least one of the stator or the rotor is directed from an opening at one axial end to an opening at the other axial end. An oil separation mechanism for separating oil by flowing oil in a substantially crank shape is provided.

  For this reason, in the compressor described in Patent Document 2, since an oil separation mechanism is provided in addition to the air gap space and the passage on the outer peripheral side of the motor, the upstream side and the downstream side of the refrigerant gas flow of the motor are provided. The differential pressure can be reduced, and the pressure loss of the compressor can be reduced.

  However, in the compressor described in Patent Document 2, the lubricating oil blown up from below easily passes through the upper and lower stators and easily reaches the space above the motor.

Japanese Patent Laid-Open No. 61-185040 JP 2007-64019 A

  Accordingly, an object of the present invention is to provide an axial gap type rotating electrical machine in which lubricating oil blown up from below does not stay in the space above the motor but easily drops, and a compressor using the same.

  In order to solve the above-described problems, an axial gap type rotating electrical machine according to the present invention is disposed to be rotatable about a rotation axis, and on both sides in the rotation axis direction, which is a direction parallel to the rotation axis, around the rotation axis. A rotor having a magnetic pole surface, and disposed on one side of the rotor in the direction of the rotation axis with a gap therebetween, and a substantially disk-shaped first magnetic core; and the rotor surface of the first magnetic core on the rotor side surface A plurality of cores disposed around the rotation axis and a first core wound around the core to generate a rotating magnetic field on the surface of the first core facing the rotor. A first stator having one coil and a first core cut portion provided in the first magnetic core, the first magnetic core functioning as a back yoke, and the other side of the rotor in the rotation axis direction. A substantially disc-shaped second magnet disposed with a gap therebetween. And a second stator having a second core cut portion provided in the second magnetic core, wherein the first core cut portion does not overlap the second core cut portion in the rotation axis direction. Is provided.

  The second stator further includes a plurality of third magnetic cores arranged on the rotor side surface along the periphery of the rotation axis, and the core core is positioned at the position of the third magnetic core. You may arrange | position facing.

  The first core cut portion and the second core cut portion are provided at predetermined positions with respect to the core core and the third magnetic core, respectively, and the first core cut portion and the second core cut portion The number of each part may be 1 / n (n ≧ 2) of the number of each of the core core and the third core.

  The second stator further includes a plurality of third magnetic cores disposed on the rotor side surface along the rotation axis, and the core core is opposed to the third magnetic core. You may arrange | position in the position shifted | deviated to the circumferential direction with respect to the position to perform.

  The first core cut portion and the second core cut portion are provided at predetermined positions with respect to the core core and the third magnetic core, respectively, and the first core cut portion and the second core cut portion Each of the portions may include a number from half or more to the same number as the number of each of the core core and the third core.

  The first stator and the second stator may be arranged with an electrical angle shifted by 180 degrees.

  The second stator may further include a second coil wound around the third magnetic core so as to generate a rotating magnetic field on the surface of the third magnetic core facing the rotor.

  In addition, the circumferential position of the first core cut part is the circumferential position of the core core, and the circumferential position of the second core cut part is a circumference between the adjacent second cores. Each may correspond to a position in the direction.

  Further, the first core cut portion is provided at a position along the outer periphery of the adjacent cores adjacent to each other, and the second core cut portion is provided at a position along the outer periphery of the adjacent third magnetic cores. May be.

  The first magnetic core includes a plurality of grooves that open toward the outer periphery and extend in the radial direction, and the core magnetic core is inserted into each of the grooves, and the outer peripheral surface of the core and the outer periphery thereof An opening formed by the groove on the side may be the first core cut portion.

  The second magnetic core includes a plurality of grooves that open toward the outer periphery and extend in the radial direction, and the third magnetic core is inserted into each of the grooves, and the outer peripheral surface of the third magnetic core and the outer periphery thereof. An opening formed by the groove on the side may be the second core cut portion.

  In addition, a core cut portion provided on a stator located above the rotation axis direction of the first stator and the second stator is disposed outside the outer diameter of the rotor. May be.

  In addition, the first stator and the second stator may have a first refrigerant passage inside the core core and the third magnetic core.

  In addition, the rotor has a second refrigerant passage, and the second refrigerant passage is provided in a stator positioned above the rotation axis direction among the first stator and the second stator. It may be arranged outside the first refrigerant passage and at a position where it does not overlap.

  Furthermore, in order to solve the said subject, this compressor is arrange | positioned on the compression-mechanism part which compresses a refrigerant | coolant, and the said compression-mechanism part, and drives the said compression-mechanism part. The high-pressure dome includes the axial gap type rotating electric machine according to one and a discharge pipe that is provided on the axial gap type rotating electric machine and discharges the refrigerant compressed by the compression mechanism unit.

  According to this axial gap type rotating electrical machine, the first core cut part is provided at a position that does not overlap the second core cut part in the direction of the rotation axis, so that the lubricating oil blown up from below is applied to the upper part of the motor. It is hard to go to the space.

  The second stator further includes a plurality of third magnetic cores arranged on the rotor side surface along the periphery of the rotation axis, and the core core is positioned at the position of the third magnetic core. If it is arranged so as to oppose, the magnetic circuit configuration becomes simpler. It is possible to adopt the same configuration for the first stator and the second stator.

  The first core cut portion and the second core cut portion are provided at predetermined positions with respect to the core core and the third magnetic core, respectively, and the first core cut portion and the second core cut portion Assuming that the number of parts is 1 / n (n ≧ 2) of the numbers of the core core and the third magnetic core, the first stator and the second stator have the same configuration. However, it is possible to select a position where the first core cut portion and the second core cut portion do not overlap in the rotation axis direction.

  The second stator further includes a plurality of third magnetic cores disposed on the rotor side surface along the periphery of the rotation axis, and the core magnetic core is in relation to the third magnetic core. Thus, a larger number of magnetic circuit configurations can be employed if they are arranged at positions displaced in the circumferential direction.

  Further, when the first core cut part and the second core cut part have a number from half or more of the number of the core cores and the number of the third magnetic cores to the same number, more portions through which the refrigerant passes are provided. be able to.

  Further, when the first stator and the second stator are arranged with an electrical angle shifted by 180 degrees, cogging torque and torque ripple can be reduced.

  The second stator may further include a second coil wound around the third magnetic core so as to generate a rotating magnetic field on a surface of the third magnetic core facing the rotor. An axial gap type rotating electrical machine that drives by generating a rotating magnetic field in the child and the second stator can be realized.

  When the first core cut portion is disposed at a position corresponding to the core core, and the second core cut portion is disposed at a position between the adjacent second cores, the first core cut portion and Regardless of the number of the second core cut portions, a configuration in which the first core cut portion and the second core cut portion do not overlap in the rotation axis direction is possible.

  In addition, the first core cut portion is provided at a position along the outer periphery of the adjacent cores adjacent to each other, and the second core cut portion is provided at a position along the outer periphery of the adjacent third magnetic cores. And the magnitude | size of the said 1st core cut part and the said 2nd core cut part is securable, ensuring the intensity | strength of the said 1st magnetic core and the said 2nd magnetic core.

  The first magnetic core includes a plurality of grooves that open toward the outer periphery and extend in the radial direction, and the core magnetic core is inserted into each of the grooves, and the outer peripheral surface of the core and the outer periphery thereof By setting the opening formed by the groove on the side as the first core cut portion, the first core cut portion can be formed without processing the first magnetic core.

  The second magnetic core includes a plurality of grooves that open toward the outer periphery and extend in the radial direction, and the third magnetic core is inserted into each of the grooves, and the outer peripheral surface of the third magnetic core and the outer periphery thereof. By making the opening formed by the groove on the side the second core cut portion, the second core cut portion can be formed without processing the second magnetic core.

  Moreover, when the core cut part provided in the stator located above with respect to the rotation axis direction among the first stator and the second stator is disposed outside the outer diameter of the rotor. There is an advantage that the lubricating oil that has passed through the core cut portion is not blown up by the rotor and is likely to fall down and the windage loss of the rotor can be reduced.

  Further, when the first stator and the second stator have the first refrigerant passage inside the core magnetic core and the third magnetic core, the core magnetic core and the third magnetic core are not obstructed. A coolant passage can be secured.

  In addition, the rotor has a second refrigerant passage, and the second refrigerant passage is provided in a stator positioned above the rotation axis direction among the first stator and the second stator. When arranged outside the first refrigerant passage and at a position that does not overlap, the lubricating oil can be efficiently separated from the refrigerant by the rotor and the stator positioned above the rotation axis direction.

  Furthermore, in order to solve the said subject, this compressor is arrange | positioned on the compression-mechanism part which compresses a refrigerant | coolant, and the said compression-mechanism part, and drives the said compression-mechanism part. When the high-pressure dome includes the axial gap type rotating electrical machine according to claim 1 and a discharge pipe that is provided on the axial gap type rotating electrical machine and discharges the refrigerant compressed by the compression mechanism, It is difficult for the lubricant to go into the space above the motor.

(First embodiment)
FIG. 1 is a plan view of the first and second stators of the axial gap motor according to the first embodiment of the present invention, as viewed from the rotor side. FIG. 2 is an exploded perspective view of the rotor 30 of the axial gap motor. The rotor 30 includes a field part 31 and a connecting part 35, and is rotatable about a rotation axis (not shown). In FIG. 2, the field portion 31 and the connecting portion 35 are shown shifted along the rotation axis.

  The axial gap type motor according to the first embodiment includes a rotor 30 (shown in FIG. 2) fixed to a rotating shaft (not shown), and first rotors that face both axial sides of the rotor 30 via air gaps. 1 stator 10 and a second stator 20 (shown in FIG. 1). That is, in the axial gap type motor, the rotor 30 is actually arranged in a state of being sandwiched between the first stator 10 and the second stator 20 shown in FIG.

    As shown in FIG. 1, the first stator 10 includes a disk-shaped back yoke 11, teeth 12 standing on the rotor side of the back yoke 11, and a three-phase coil 13 wound around the teeth 12. And have. Further, a core cut portion 14 is provided on the outer periphery of the back yoke 11.

  The second stator 20 includes a disk-shaped back yoke 21, teeth 22 standing on the rotor side of the back yoke 21, and a three-phase coil 23 wound around the teeth 22. Yes. Further, a core cut portion 24 is provided on the outer periphery of the back yoke 21.

  FIG. 1 is a developed view of the first stator 10 and the second stator 20 that face each other with the rotor 30 interposed therebetween. The surface facing the rotor 30 of the first stator 10 is shown in the upper part of the drawing relative to the alternate long and short dash line, and the surface of the second stator 20 facing the rotor 30 is shown in the lower part of the drawing than the alternate long and short dashed line. Further, in FIG. 1, the U-phase coil U of the first stator 10 faces the coil U of the second stator 20, the V-phase coil V of the first stator 10 faces the coil V of the second stator 20, The W-phase coil W of the first stator 10 faces the coil W of the second stator 20. That is, the configuration shown in FIG. 1 is a configuration in which the teeth 12 of the first stator 10 and the teeth 22 of the second stator 20 face each other.

  Each of the coil 13 of the first stator 10 and the coil 23 of the second stator 20 is a concentrated winding in which each phase is wound in order in the circumferential direction, and the first and second stators 10 and 20 are axially wound from both sides. It is wound in the same direction as seen from the sandwiched rotor 30 (shown in FIG. 2) side. The winding start (or winding end) of the coil 13 of the first stator 10 is the neutral point side (shown by 15 in FIG. 1), and the winding start (or winding end) of the coil 23 of the second stator 20 is also the neutral point side. The winding specifications of the first and second stators 10 and 20 are the same (shown at 25 in FIG. 1).

  Moreover, since the number of each of the core cut parts 14 and 24 shown in FIG. 1 is 1 / n or less (n is an integer greater than or equal to 2) of the number of each of the teeth 12 and 22, the core cut part 14 is The second core cut part 24 can always be provided at a position that does not overlap with the rotation axis direction. That is, the 1st stator 10 and the 2nd stator 20 can be formed from the same component, and cost can be reduced. In the example shown in FIG. 1, the number of core cut portions 14, 24 is equal to one-half (n = 2) of the number of teeth 12, 22, and the teeth 12, 22 are Eight core cut parts 14 and 24 are provided with respect to twelve. By providing at equal intervals, it is possible to return the oil evenly over the entire circumference.

  Referring to FIG. 2, field portion 31 includes magnet 32 and magnetic plates 33 and 34 as an example of a magnetic core that sandwiches magnet 32 from both sides in the axial direction. The magnet 32 has a first magnetic pole surface and a second magnetic pole surface that have different polarities on both sides in the axial direction. For example, the first magnetic pole surface exhibits an N pole, and the second magnetic pole surface exhibits an S pole.

  It is desirable to employ a sintered rare earth magnet for the magnet 32 in order to increase the magnetic flux density. In this case, rare earth magnets, particularly sintered magnets, have high conductivity and are liable to cause eddy current loss. However, by using a magnetic material having a lower conductivity than rare earth magnets for the magnetic plates 33 and 34, eddy currents can be obtained. Generation of current loss can be suppressed. In particular, eddy current loss due to a change in magnetic flux of a carrier component in PWM control can be reduced.

  The magnetic plates 33 and 34 are provided on the first magnetic pole surface and the second magnetic pole surface of the magnet 32, respectively. At this time, the magnetic plates 33 and 34 are fixed to the magnet 32 using, for example, an adhesive. It is desirable to employ an adhesive made of a magnetic material. By using an adhesive made of a magnetic material, it is possible to compensate for a decrease in magnetic properties due to a reduction in the thickness of the adhesive layer between the magnetic plates 33 and 34 and the magnet 32.

  By adopting magnetically isotropic powder magnetic cores for the magnetic plates 33 and 34, in particular, by adopting a dust core, eddy current loss can be less likely to occur in the magnetic plates 33 and 34.

  The field magnet portions 31 are annularly arranged around the rotation axis along the circumferential direction, and are separated from each other along the circumferential direction. At this time, with respect to the magnet 32, the magnet 32 is also arranged in a ring shape along the circumferential direction around the rotation axis.

  The magnets 32 adjacent to each other in the circumferential direction exhibit different polarities on both sides in the axial direction. That is, when one adjacent magnet 32 has the first magnetic pole surface facing one side in the axial direction, the other adjacent magnet 32 has the second magnetic pole surface facing one side in the same axial direction. . The same applies to the other side in the axial direction. However, the present invention is not limited to this. For example, a pair of adjacent magnets may form a set, and the magnetic pole face having the same polarity may be exhibited in the set. In this case, the polarities of the magnetic pole surfaces presented by the adjacent groups are different. Note that different magnets may be provided on both sides in the axial direction so that each magnet generates a magnetic pole on each side. In that case. The relationship between the magnetic poles on both sides is not questioned.

  The connecting portion 35 is made of a non-magnetic material and connects the field magnet portions 31 to each other. The nonmagnetic material of the connecting portion 35 may be a nonmetal such as a resin, or may be a metal such as aluminum or stainless steel. If a non-metal is used for the connecting portion 35, eddy current loss does not occur in the connecting portion 35. On the other hand, if a metal is employed for the connecting portion 35, the strength of the connecting portion 35 is increased.

  In the rotor, the magnetic poles appearing on both sides in the axial direction may be reversed. Therefore, the minimum configuration of the rotor is one magnet layer in the axial direction.

  In the axial gap type motor including the first stator 10 and the second stator 20 shown in FIG. 1 and the rotor 30 shown in FIG. 2, the core cut portion 14 provided in the first stator 10 and the core cut provided in the second stator 20. Since the axial gap type motor does not overlap with the portion 24 in the axial direction, when the axial gap type motor is used for the compressor, the lubricating oil blown up from the lower portion of the motor does not easily reach the space above the motor through the core cut portions 14 and 24. It has a structure.

  In the first stator 10 and the second stator 20 shown in FIG. 1, the core cut portions 14 and 24 are provided on the back yokes 11 and 21 at the same position (between the circumferential positions of the adjacent teeth 12 and 22). However, the present invention is not limited to this, and the position of the core cut portion 14 on the back yoke 11 and the position of the core cut portion 24 of the second stator 20 may be different. Specifically, FIG. 3 shows the first stator 10 and the second stator 20 in which the position of the core cut portion 14 with respect to the teeth 12 on the back yoke 11 and the position of the core cut portion 24 with respect to the teeth 22 of the second stator 20 are different. In addition, the same code | symbol is attached | subjected to the same component as FIG. 1, and detailed description is abbreviate | omitted.

  In the first stator 10 shown in FIG. 3, unlike the configuration of the first stator 10 in FIG. 1, a core cut portion 14 is provided at an outer peripheral position corresponding to the teeth 12. On the other hand, in the 2nd stator 20 shown in FIG. 3, the core cut part 24 is provided in the outer peripheral position between the adjacent teeth 22 similarly to the structure of the 2nd stator 20 of FIG. Therefore, when the first stator 10 and the second stator 20 are overlapped on the basis of a fold line (dashed line) between the first stator 10 and the second stator 20, the core cut portion 14 and the core cut portion 24 are overlapped. It is a configuration that does not necessarily overlap in the axial direction. Furthermore, since the position of the core cut portion 14 on the back yoke 11 and the core cut portion 24 of the second stator 20 are different, the teeth 12 of the first stator 10 and the teeth 22 of the second stator 20 are at any position. Even if they face each other, the core cut portion 14 and the core cut portion 24 do not necessarily overlap in the axial direction. Therefore, like the first stator 10 and the second stator 20 shown in FIG. 1, the number of core cut portions 14, 24 is limited to 1 / n or less of the number of teeth 12, 22. The first stator 10 and the second stator 20 shown in FIG.

  In the present embodiment, the windings of the coils 13 and 23 have been described on the premise of concentrated winding. However, the present invention is not limited to this, and other winding methods such as distributed winding may be used. However, concentrated winding is desirable because it does not hinder the passage of refrigerant or lubricating oil. Moreover, as shown in FIG. 1 etc., it is desirable for the connection of the coils 13 and 23 to exist inside the teeth 12 and 22. Thus, the connection does not disturb the core cut portions 14 and 24.

(Second Embodiment)
In the axial gap type motor according to the first embodiment, as shown in FIG. 1, the configuration in which the teeth 12 of the first stator 10 and the teeth 22 of the second stator 20 face each other is shown. On the other hand, in the axial gap type motor according to the present embodiment, as shown in FIG. 4, a configuration in which the teeth 12 of the first stator 10 and the teeth 22 of the second stator 20 do not face each other will be described.

  The first stator 10 shown in FIG. 4 has a disk-shaped back yoke 11, teeth 12 standing on the rotor side of the back yoke 11, and a three-phase coil 13 wound around the teeth 12. is doing. Also, the second stator 20 shown in FIG. 4 includes a disk-shaped back yoke 21, teeth 22 standing on the rotor side of the back yoke 21, and a three-phase coil 23 wound around the teeth 22. have. FIG. 4 is also a developed view of the first stator 10 and the second stator 20 that face each other with the rotor 30 interposed therebetween. The surface facing the rotor 30 of the first stator 10 is shown in the upper part of the drawing relative to the alternate long and short dash line, and the surface of the second stator 20 facing the rotor 30 is shown in the lower part of the drawing than the alternate long and short dashed line. 4, unlike FIG. 1, the portion between the U-phase coil U and the V-phase coil V of the first stator 10 faces the W-phase coil W of the second stator 20.

  Furthermore, the first stator 10 shown in FIG. 4 is provided with core cut portions 14 at all outer peripheral positions between adjacent teeth 12. Further, in the second stator 20 shown in FIG. 4, core cut portions 24 are provided at all outer peripheral positions between adjacent teeth 22. That is, the number of core cut portions 14 and 24 shown in FIG. 4 is the same as the number of teeth 12 and 22. Therefore, as shown in FIG. 1, if the teeth 12 of the first stator 10 and the teeth 22 of the second stator 20 face each other, the core cut portion 14 and the core cut portion 24 overlap in the axial direction. However, if the teeth 12 of the first stator 10 and the teeth 22 of the second stator 20 are shifted from each other as shown in FIG. 4, the core cut portion 14 and the core cut portion 24 may overlap in the axial direction. Absent.

  When the number of core cut portions 14 and 24 is more than half of the number of teeth 12 and 22 as in the first stator 10 and the second stator 20 according to the present embodiment, as shown in FIG. If the teeth 12 and the teeth 22 of the second stator 20 face each other, one of the core cut portions 14 overlaps the core cut portion 24 in the axial direction. Therefore, the configuration in which the number of the core cut portions 14 and 24 is larger than half of the number of the teeth 12 and 22 and the positional relationship of the core cut portion 14 with respect to the teeth 12 is the positional relationship of the core cut portion 24 with respect to the teeth 22. In the same case, it is necessary to dispose the teeth 12 of the first stator 10 and the teeth 22 of the second stator 20 as shown in FIG.

  Further, as shown in FIG. 4, in the second stator 20, the W-phase coil is located at a position corresponding to between the U-phase coil U <b> 1 of the first stator 10 and the tooth 12 around which the V-phase coil V <b> 1 is wound. It has the teeth 22 around which W4 is wound. For example, since the combined magnetic field of the U-phase coil 13 and the V-phase coil 13 of the first stator 10 is U + V + W = 0 as long as the three-phase balance is maintained, U + V = −W. That is, the space between the U-phase coil 13 and the V-phase coil 13 of the first stator 10 is equivalent to −W.

  On the other hand, the second stator 20 opposite to this has a tooth 22 wound with a W-phase coil 23, and the two stators are in the relationship from the -W phase to the W phase with respect to the magnetic poles of the opposing rotor 30. It can be seen that the first and second stators 10 and 20 generate the same rotating magnetic field with respect to the rotor 30.

  At this time, the winding direction with respect to the teeth 12 and 22, that is, where the current winding starts and in which direction the winding starts is not important. For example, when the power is supplied from the power source toward the neutral points 15 and 25, Are the same. That is, it refers to the direction in which current flows in relation to the connection. However, from the viewpoint of manufacturing, considering that the coils 13 and 23 are individually wound in the same direction and are provided in the first and second stators 10 and 20, the actual winding direction is the same. It is desirable to be.

  Thus, except for the saliency of the first and second stators 10 and 20, the magnetic field generated by the current supplied to the coils 13 and 23 of the first and second stators 10 and 20 is two first and second stators. It is apparent that the same torque and the same thrust force are generated because the two stators 10 and 20 are 180 ° out of phase and the opposite rotor 30 is 180 ° out of phase. Further, since the teeth 12 and 22 are provided by 15 degrees shifted by the two first and second stators 10 and 20, they are reduced in terms of cogging torque and torque ripple. Therefore, since maximum torque control can be performed simultaneously, there is no deterioration in characteristics, and cogging torque and torque ripple can be reduced.

(Third embodiment)
The core cut portions 14 and 24 shown in FIGS. 1 and 4 have a structure in which rectangular cutouts are provided on the outer circumferences of the back yokes 11 and 21. However, the shape of the core cut portions 14 and 24 according to the present invention is not limited to this, and may be a hole or other notch. As in the first stator 10 shown in FIG. 5, the core cut portion 14 according to the present embodiment is provided as a notch along the outer shape of the coil on the outer periphery of the back yoke 11 between adjacent teeth 12.

  Note that the back yoke 11 shown in FIG. 5 includes a yoke 11b for fixing the tooth 12 and a yoke 11a provided at a position surrounding the tooth 12. The teeth 12 have a triangular prism 12 a around which a winding is wound and a prism 12 b provided with a convex portion 17. The prism 12b is located farther from the rotor (not shown) than the triangular prism 12a. The convex portion 17 has a smaller circumferential dimension than the prism 12b and protrudes from the prism 12b to the opposite side of the triangular prism 12a.

  FIG. 6a shows a plan view of the yoke 11a, and FIG. 6b shows a plan view of the yoke 11b. The yoke 11a in FIG. 6a is composed of steel plates stacked in the direction of the rotation axis, and the core 11 is provided at a circumferential position between the frame 16 that engages with the prism 12b of the tooth 12 and the adjacent tooth 12 on the yoke 11a. Part 14. The core cut part 14 is exhibiting the recessed part with respect to the triangular prism 12a located in the both sides in the circumferential direction, respectively.

  On the other hand, the yoke 11b in FIG. 6b is formed of a lump of magnetic material (for example, iron), and the yoke 11b is provided with a groove 18 that engages with the convex portion 17 provided on the bottom surface of the tooth 12, and the tooth 18 is provided with the tooth 18b. The teeth 12 are fixed to the back yoke 11 by fitting with the twelve convex portions 17. Moreover, the yoke 11b of FIG. 6b is provided with the core cut part 14 of the same shape in the position which overlaps with the core cut part 14 provided in the yoke 11a.

  On the other hand, the second stator 20 has the same configuration as that of the first stator 10 shown in FIG. 5, and the core cut portion 24 is a notch having the same shape as the core cut portion 14.

  As described above, the space between the adjacent teeth 12 and 22 is effectively obtained by making the shape of the core cut portions 14 and 24 to be concave portions with respect to the triangular prisms 12a located on both sides in the circumferential direction. Can be used. That is, the bikini-shaped core cut portions 14 and 24 can obtain a large opening while avoiding the position occupied by the coils wound around the teeth 12 and 22. The core cut portions 14 and 24 may have a wedge shape or the like that does not have a recess as long as the strength of the yoke can be maintained. Further, the hole may be a through hole without opening on the outer diameter side, but it is desirable that the gap between the hole and the yoke outer diameter is sufficiently thin. This is because the oil tends to drip along the wall of the compressor container, so that if the gap between the hole and the outer diameter of the yoke is thick, the oil accumulates there and becomes difficult to drip.

(Fourth embodiment)
7A and 7B are plan views of the first stator 10 and the second stator 20 according to this embodiment. In the first stator 10 shown in FIG. 7A, the back yoke 110 includes a plurality of grooves 111 that open toward the outer periphery and extend in the radial direction. Further, a tooth 112 is inserted into each of the grooves 111. The tooth 112 is provided with a wound three-phase coil.

  Furthermore, in the 1st stator 10 shown to FIG. 7a, the opening part formed in the outer peripheral surface of the teeth 112 and the groove | channel 111 on the outer peripheral side is used as the core cut part 114. The core cut portion 114 corresponds to the core cut portion 14 of the first stator 10 shown in FIG. 7c shows a cross-sectional view of the groove 111 cut along the II plane of FIG. 7a. As can be seen from this cross-sectional view, the back yoke 110 is inserted into the back yoke 110 when the teeth 112 are inserted. A guide groove is provided so as not to be detached from the yoke 110.

  As described above, if the first stator 10 in which the teeth 22 are inserted into the back yoke 110 from the outer peripheral side is employed, the core cut portion 114 can be provided on the outer periphery without providing the back yoke 110 with a notch or a hole. The configuration of the first stator 10 can be simplified.

  On the other hand, the second stator 20 shown in FIG. 7b is a stator having no coil. The second stator 20 shown in FIG. 7b includes a frame 121 having a shape including a wall 121 in the vicinity of a rotating shaft (not shown), an outer peripheral wall 122, and a bottom portion 123 connecting both walls 121 and 122. The core 125 is held. A core is comprised from a powder magnetic core, a wound iron core, etc., and the material of a frame is arbitrary. In order to fix the frame to the compressor container, the frame needs to have strength. For example, a metal (iron) which is a magnetic material or a metal (aluminum, SUS, etc.) which is a non-magnetic material is preferable. FIG. 7d shows a sectional view of the second stator 20 cut along the plane II-II in FIG. 7b. As can be seen from FIGS. 7 b and 7 d, a part of the outer peripheral wall 122 is removed, and this part functions as the core cut 124. In addition, there is no frame and you may comprise only with a core, In this case, a core cut is directly provided in a core.

  7A and 7B are views in which the first stator 10 and the second stator 20 that are opposed to each other with the rotor 30 interposed therebetween are developed. The surface facing the rotor 30 of the first stator 10 is shown in the upper part of the drawing relative to the alternate long and short dash line, and the surface of the second stator 20 facing the rotor 30 is shown in the lower part of the drawing than the alternate long and short dashed line. Therefore, the core cut 124 and the back yoke 110 correspond to each other, and the outer peripheral wall 122 and the core cut portion 114 are provided at corresponding positions. Therefore, the core cut portion 114 of the first stator 10 and the core of the second stator 20 are provided. The cut portion 124 does not overlap in the axial direction.

  Moreover, in the 1st stator 10 and the 2nd stator 20 which are shown to FIG. 7a, b, the lead wire provided in the 1st stator 10 and the terminal are provided with lubricating oil by arrange | positioning the 2nd stator 20 to the axial direction lower side. It is possible to make the structure difficult to soak. Furthermore, since the second stator 20 not provided with a coil is not limited in the position and size at which the core cut is provided, the core cut portion 124 can be made larger than the core cut portion 114. Further, since the lubricating oil can be separated by the rotor 30, the core cut portion 114 of the first stator 10 positioned on the upper side in the axial direction does not need to be as large as the core cut portion 124 of the second stator 20, and the lubricating oil blows up. From the viewpoint of prevention, it is desirable that the core cut portion 124 is larger than the core cut portion 114.

  In the axial gap type motor according to the present embodiment, as shown in FIGS. 7a and 7b, different configurations are adopted in the upper and lower stators, but the present invention is not limited to this, and the configuration of the first stator 10 shown in FIG. 7a. May also be used for the lower stator (second stator 20 on the lower side in the axial direction). In the configuration shown in FIG. 7b, the second stator 20 which is the lower stator has a configuration without a coil, but the present invention is not limited to the shape of the second stator 20 shown in FIG. 7b. For example, as the 2nd stator 20 which does not have a coil, the structure which does not wind a coil around the teeth 112 of the 1st stator 10 shown to FIG. 7a, or the structure which does not wind a coil around the teeth 12 of the 1st stator 10 shown in FIG. Conceivable. In other words, the same configuration may be adopted for the upper and lower stators, and the configuration in which the presence or absence of the stator coil is determined depending on whether or not the coil is wound around the teeth. With such a configuration, the same parts can be used in the upper and lower stators, the number of parts can be reduced, and work efficiency can be improved.

(Fifth embodiment)
In FIG. 8, the longitudinal cross-sectional view of the compressor which concerns on this embodiment is shown. The compressor shown in FIG. 8 is a high-pressure dome type. The motors according to the first to fourth embodiments are also basically employed in the compressor shown in FIG. 8 and are basically the same except that the configurations of the first stator and the second stator are different. The same configuration.

  As shown in FIG. 8, this compressor is disposed in a sealed container 401, a compression mechanism unit 402 disposed in the sealed container 401, and disposed in the sealed container 401 and above the compression mechanism unit 402. Is provided with an axial gap type motor 403 that is driven through a rotating shaft 404. A suction pipe 441 is connected to the lower side of the sealed container 401, while a discharge pipe 442 is connected to the upper side of the sealed container 401. The refrigerant gas supplied from the suction pipe 441 is guided to the suction side of the compression mechanism unit 402.

  The axial gap type motor 403 includes two stators (an upper first stator 410 and a lower second stator 420) in which a part of the outer peripheral side is fixed inside the sealed container 401 and the rotation shaft 404 passes through a central portion. The rotor 430 is disposed between the first stator 410 and the second stator 420 in the axial direction, and is fitted around and fixed to the rotary shaft 404. The lower end side of the rotating shaft 404 to which the rotor 430 is fixed is connected to the compression mechanism unit 2.

  The compression mechanism 402 includes a cylindrical main body 440 and an upper end plate 408 and a lower end plate 409 attached to upper and lower open ends of the main body 440, respectively. The rotation shaft 404 passes through the upper end plate 408 and the lower end plate 409 and is inserted into the main body 440. The rotation shaft 404 is rotatably supported by a bearing 451 provided on the upper end plate 408 of the compression mechanism unit 402 and a bearing 452 provided on the lower end plate 409 of the compression mechanism unit 402. A crank pin 405 is provided on a rotating shaft 404 in the main body 440, and compression is performed by a compression chamber 407 formed between a piston 406 fitted and driven by the crank pin 405 and a corresponding cylinder. The piston 406 rotates in an eccentric state or revolves to change the volume of the compression chamber 407.

  In the compressor configured as described above, when the compression mechanism unit 402 is driven by rotating the axial gap motor 403, the refrigerant gas is supplied from the suction pipe 441 to the compression mechanism unit 402, and the refrigerant gas is compressed by the compression mechanism unit 402. . Thus, the high-pressure refrigerant gas compressed by the compression mechanism unit 402 is discharged into the sealed container 401 from the discharge port 453 of the compression mechanism unit 402, and refrigerant passages 415, 425, second provided around the rotation shaft 404. After being conveyed to the upper space of the axial gap type motor 403 through the core cut part 424 of the stator 420, the hole (not shown) penetrating the inside of the rotor 430 in the axial direction, and the core cut part 414 of the first stator 410. , And discharged to the outside of the sealed container 401 through the discharge pipe 442. Note that the first stator 410 shown in FIG. 8 includes a back yoke 411, teeth 412, and a coil 413. The second stator 420 shown in FIG. 8 includes a back yoke 421, teeth 422, and a coil 423. However, in the configuration in which the second stator 420 is not provided with a coil, there may be a case where the teeth 422 and the coil 423 are unnecessary.

  The core cut portion 414 of the first stator 410 shown in FIG. 8 is outside the outer diameter of the rotor 430. By adopting the configuration of the core cut portion 414 shown in FIG. 8, the lubricating oil falling down through the core cut portion 414 does not hit the rotor 430 and is blown up, and the first stator core cut to the second stator. Since there is no rotor in the path connecting the core cuts, the oil dripping from the core cut of the first stator toward the core cut of the second stator is prevented from coming into contact with the rotor, thereby reducing the windage loss of the rotor 430. be able to.

  Further, the first stator 410 shown in FIG. 8 is provided with a refrigerant passage 415 in the gap with the rotation shaft 404, and the second stator 420 shown in FIG. Yes. That is, the refrigerant passage 415 is provided on the inner side (rotation shaft 404 side) of the teeth 412 of the first stator 410, and the refrigerant passage 425 is provided on the inner side (rotation shaft 404 side) of the teeth 422 of the second stator 420. It has been.

  Further, FIG. 9a shows a plan view of the rotor 430 shown in FIG. The rotor 430 shown in FIG. 9a has a region 431 in which the d-axis core is embedded in the connecting portion 435 and a region 432 in which the q-axis core is embedded. Furthermore, a refrigerant passage 436 that is a hole penetrating in the axial direction is provided in the inner peripheral portion of the rotor 430 shown in FIG. 9A. The refrigerant passage 36 is provided outside the through hole radius φDs of the first stator 410 and the second stator 420 and does not overlap the refrigerant passages 415 and 425. Note that the positions of the refrigerant passages 415 and 425 in FIG. 9 are portions between the hole for the rotation shaft (not shown) provided in the connecting portion 435 and the radius φDs of the through hole. Further, the radius φDr of the connecting portion 435 where the refrigerant passage 436 is provided has a relationship (φDr> φDs) larger than the radius φDs of the through hole. FIG. 9b shows a cross-sectional view of the rotor 430 cut along the III-III plane in FIG. 9a.

  As described above, the refrigerant passages 415 and 425 of the first stator 410 and the second stator 420 and the refrigerant passage 436 of the rotor 430 do not overlap with each other, so that the refrigerant containing lubricating oil is straight from the second stator 420 to the first stator 410. Thus, the lubricating oil can be efficiently separated from the refrigerant by the rotor 430 and the first stator 410.

  Note that the axial gap type motor 403 shown in FIG. 8 discloses a configuration in which the rotating shaft 404 passes through the first stator 410, but the present invention is not limited to this, and the rotating shaft 404 passes through the first stator 410. The structure which does not do may be sufficient. In addition, the rotating shaft 404 shown in FIG. 8 is not provided with a passage through which the refrigerant passes, but the present invention is not limited to this, and a passage through which the refrigerant passes may be provided in the shaft.

It is a top view of the 1st stator and the 2nd stator of the axial gap type motor concerning a 1st embodiment of the present invention. 1 is an exploded perspective view of a rotor of an axial gap type motor according to a first embodiment of the present invention. It is a top view of another 1st stator and 2nd stator of an axial gap type motor concerning a 1st embodiment of the present invention. It is a top view of the 1st stator and the 2nd stator of the axial gap type motor concerning a 2nd embodiment of the present invention. It is a disassembled perspective view of the 1st stator of the axial gap type motor which concerns on the 3rd Embodiment of this invention. It is a top view of the 1st stator of the axial gap type motor concerning a 3rd embodiment of the present invention. It is the top view and sectional view of the 1st stator and the 2nd stator of the axial gap type motor concerning a 4th embodiment of the present invention. It is a longitudinal cross-sectional view of the compressor which concerns on the 5th Embodiment of this invention. It is the top view and sectional view of a rotor of an axial gap type motor concerning a 6th embodiment of the present invention.

Explanation of symbols

10,410 1st stator 11, 21, 110, 411, 421 Back yoke 12, 22, 112, 412, 422 Teeth 13, 23, 413, 423 Coils 14, 24, 114, 414, 424 Core cut portions 15, 25 Neutral point 20, 420 Second stator 30, 430 Rotor 31 Field part 32 Magnet 33, 34 Magnetic plate 35, 435 Connection part 111 Groove 121, 122 Wall 123 Bottom part 401 Sealed container 402 Compression mechanism part 403 Axial gap type motor 404 Rotating shaft 405 Crank pin 406 Piston 407 Compression chamber 408 Upper end plate 409 Lower end plate 415, 425 Refrigerant passage 441 Intake pipe 442 Discharge pipe 451, 452 Bearing 453 Discharge port

Claims (15)

A rotor (30) disposed rotatably about a rotation axis and presenting a magnetic pole surface (31) around the rotation axis on both sides in the rotation axis direction, which is a direction parallel to the rotation axis;
A substantially disc-shaped first magnetic core (11) disposed on one side of the rotor (30) in the direction of the rotation axis and the rotor (30) side of the first magnetic core (11) A rotating magnetic field is generated on the surface of the plurality of core cores (12) disposed on the surface of the first core core (12) facing the rotor (30). The first coil (13) wound around the core core (12) and the first core cut portion (14) provided on the first core (11) to have the first core A first stator (10) whose magnetic core functions as a back yoke;
A second disk cut disposed on the other side of the rotor (30) in the direction of the rotation axis with a gap therebetween and provided in a substantially disk-shaped second magnetic core (21) and the second magnetic core (21) A second stator (20) having a portion (24);
With
The first core cut part (14) is an axial gap type rotating electrical machine provided at a position not overlapping with the second core cut part (24) in the rotation axis direction. The axial gap type rotating electrical machine according to claim 1,
The second stator (20) further includes a plurality of third magnetic cores (22) disposed on the surface on the rotor (30) side along the rotation axis,
The core magnetic core (12) is an axial gap type rotating electrical machine arranged to face the position of the third magnetic core (22). An axial gap type rotating electrical machine according to claim 2,
The number of each of the first core cut part (14) and the second core cut part (24) is 1 / n of the number of each of the core core (12) and the third core (22) ( An axial gap type rotating electrical machine in which n ≧ 2). The axial gap type rotating electrical machine according to claim 1,
The second stator (20) further includes a plurality of third magnetic cores (22) disposed on the surface on the rotor (30) side along the rotation axis,
The core magnetic core (12) is an axial gap type rotating electrical machine arranged at a position shifted in the circumferential direction with respect to a position facing the third magnetic core (22). An axial gap type rotating electrical machine according to claim 4,
Each of the first core cut part (14) and the second core cut part (24) is a number from more than half to the same number of the core cores (12) and the third magnetic cores (22). Axial gap type rotating electrical machine equipped with An axial gap type rotating electric machine according to claim 4 or 5,
The first stator (10) and the second stator (20) are an axial gap type rotating electrical machine in which the electrical angle is shifted by 180 degrees. An axial gap type rotating electrical machine according to any one of claims 2 to 6,
The second stator (20)
An axial gap type further comprising a second coil (23) wound around the third magnetic core (22) so as to generate a rotating magnetic field on the surface of the third magnetic core (22) facing the rotor (30). Rotating electric machine. An axial gap type rotating electrical machine according to any one of claims 1 to 7,
The circumferential position of the first core cut part (14) is the circumferential position of the core core (12), and the circumferential position of the second core cut part (24) is the adjacent first position. Axial gap type rotating electrical machines corresponding to positions in the circumferential direction between the two-winding magnetic cores (22). An axial gap type rotating electrical machine according to any one of claims 1 to 7,
The first core cut portion (14) is provided at a position along the outer periphery of the adjacent core cores (12), and the second core cut portion (24) is adjacent to the third magnetic core (22). ) An axial gap type rotating electrical machine provided at a position along the outer periphery of each other. An axial gap type rotating electrical machine according to any one of claims 1 to 7,
The first magnetic core (110) includes a plurality of grooves (111) that open toward the outer periphery and extend in the radial direction,
The core core (112) is inserted into each of the grooves, and an opening formed by the outer peripheral surface of the core core (112) and the groove (111) on the outer peripheral side than the outer core is formed in the first core cut. Axial gap type rotating electrical machine as a part (114). An axial gap type rotating electrical machine according to claim 10,
The second magnetic core (21) includes a plurality of grooves that open toward the outer periphery and extend in the radial direction,
The third magnetic core (22) is inserted into each of the grooves, and an opening formed by the outer peripheral surface of the third magnetic core (22) and the groove on the outer peripheral side thereof is defined as the second core cut portion (24 ) Axial gap type rotating electrical machine. An axial gap type rotating electrical machine according to any one of claims 1 to 11,
Of the first stator (410) and the second stator (420), the core cut portion (414) provided on the stator positioned above the rotation axis direction is formed on the rotor (430). ) Axial gap type rotating electrical machine disposed outside the outer diameter of the outer diameter. An axial gap type rotating electrical machine according to any one of claims 1 to 11,
The first stator (410) and the second stator (420) are axial having first refrigerant passages (415, 425) inside the core core (412) and the third magnetic core (422). Gap type rotating electrical machine. An axial gap type rotating electrical machine according to claim 13,
The rotor (30) has a second refrigerant passage (436);
The second refrigerant passage (436) is provided in the first stator (410) and the second stator (420) provided in the stator located above the rotation axis direction. An axial gap type rotating electrical machine disposed outside the refrigerant passage (415, 425) and at a position where it does not overlap. A compression mechanism (402) for compressing the refrigerant;
The axial gap type rotating electrical machine (403) according to any one of claims 1 to 12, which is disposed on the compression mechanism section (402) and drives the compression mechanism section (402).
A compressor provided on the axial gap type rotating electrical machine (403) and having a discharge pipe (442) for discharging the refrigerant compressed by the compression mechanism (402) in a high-pressure dome (401).

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