WO2014141428A1 - 永久磁石埋込型電動機及び圧縮機 - Google Patents
永久磁石埋込型電動機及び圧縮機 Download PDFInfo
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- WO2014141428A1 WO2014141428A1 PCT/JP2013/057171 JP2013057171W WO2014141428A1 WO 2014141428 A1 WO2014141428 A1 WO 2014141428A1 JP 2013057171 W JP2013057171 W JP 2013057171W WO 2014141428 A1 WO2014141428 A1 WO 2014141428A1
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- magnet
- permanent magnet
- electric motor
- embedded
- protrusion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
Definitions
- the present invention relates to a permanent magnet embedded electric motor in which a permanent magnet is embedded in a rotor core, and a compressor including the same.
- a permanent magnet embedded type motor in which a permanent magnet is embedded in a rotor core is often used.
- a plurality of magnet housing holes for embedding a plurality of permanent magnets are provided inside the rotor core.
- space portions called flux barriers are provided at both ends in the longitudinal direction of the magnet housing holes in order to suppress short-circuit magnetic flux of the magnets when the permanent magnets are embedded.
- the magnet insertion hole is provided with a positioning projection for determining the magnet arrangement position.
- the protrusion has a structure that makes surface contact with the magnet at both ends in the longitudinal direction of the magnet.
- a rotor of an embedded permanent magnet electric motor disclosed in Patent Document 1 is housed and held in a rotor core having a laminated high magnetic permeability thin iron plate having a plurality of holes that store permanent magnets.
- a plurality of permanent magnets are provided, punched reliefs are provided at both ends of the hole, and the permanent magnets are fixed by surface contact between the rotor core and the permanent magnets.
- the rotor of the permanent magnet embedded motor disclosed in Patent Document 2 includes a plurality of magnet insertion holes, a permanent magnet inserted in a substantially central portion of the magnet insertion hole, and a demagnetization suppression protrusion. Yes.
- Each of the magnet insertion holes is provided along the outer peripheral edge of the rotor core. Between the outer peripheral side of both ends of the magnet insertion hole and the outer peripheral edge of the rotor core, an outer peripheral thin part having a predetermined radial dimension is provided. Is formed.
- the demagnetization suppression protrusion protrudes at a predetermined distance from the permanent magnet from the outer peripheral side or inner peripheral side of the magnet insertion hole in the space at both ends where the permanent magnet of the magnet insertion hole is not inserted.
- the shortest distance between the demagnetization suppressing projection and the magnet insertion hole is configured to be smaller than the radial width of the magnet insertion hole.
- a first magnet stopper that protrudes radially inward is formed at the outer diameter side end of the magnet insertion hole on the side of the interelectrode core.
- a second magnet stopper projecting radially inward is formed at the outer diameter side end of the magnet insertion hole between the magnet insertion holes.
- a brushless DC motor and a compressor main body are provided concentrically inside a hermetic casing, and R32 alone, as a refrigerant that is sucked, compressed, and discharged by the compressor main body, Or the R32 rich mixed refrigerant was adopted, and the J coercive force of the rare earth magnet was set to 23 kOe or more.
- JP 2007-159281 (mainly see FIG. 2) JP2012-210040 (mainly see FIG. 10) JP2009-247131 (refer mainly to FIG. 1) Japanese Patent Laid-Open No. 2001-115963 (refer mainly to FIG. 12)
- the embedded permanent magnet electric motor shown in Patent Document 1 has a magnet when a demagnetizing field (magnetic flux reverse to the magnetic flux generated by the permanent magnet) generated by the stator winding is applied to the rotor. Since the magnetic permeability of the magnetic flux is almost the same as that of air and the magnetic flux does not easily pass, the magnetic flux tends to flow in the direction in which the magnetic resistance is small. At this time, the demagnetizing field passes from the vicinity of the corner on the outer periphery of the magnet having the smallest spatial distance to the surface contact portion on the side surface of the magnet, so that the vicinity of the corner on the outer periphery of the magnet is demagnetized and torque is reduced. There was a problem of inviting.
- the shortest distance between the demagnetization suppressing protrusion and the magnet insertion hole is configured to be smaller than the radial width of the magnet insertion hole. Therefore, a demagnetizing field flows from the demagnetization suppressing protrusion to the magnet fixing protrusion. At this time, there is a problem that the vicinity of the corner of the magnet adjacent to the magnet fixing projection is demagnetized, resulting in a decrease in torque.
- the surface area that can contact the permanent magnet and the magnet insertion hole is smaller than the inner diameter side. Since the outer diameter side is configured to be wider, a demagnetizing field flows to the inner diameter side of the magnet insertion hole via the vicinity of the corner portion on the outer diameter side of the magnet, and the vicinity of the corner portion on the outer diameter side of the magnet is reduced. There was a problem of magnetizing and causing a decrease in torque.
- the present invention has been made in view of the above, and an object of the present invention is to provide an embedded permanent magnet electric motor having improved demagnetization resistance near the corners of the magnet while ensuring the positioning of the magnet.
- an embedded permanent magnet electric motor includes a rotor, a stator installed so as to face the rotor with a gap, and a rotor core of the rotor.
- a plurality of permanent magnets inserted into each of the plurality of formed magnet receiving holes, and at each end of the outer demarcation line of each of the magnet receiving holes, a pair of microprojections, a pair of large projections, and a pair
- the permanent magnets are arranged so as to be sandwiched between a pair of corresponding microprojections, and the microprojections protrude radially inward, respectively.
- the large projections are in surface contact with the corresponding end surfaces of the permanent magnets inserted into the magnet accommodation holes, and the large projections are respectively provided on the outer side of the corresponding minute projections, and on the inner demarcation line side of the magnet accommodation holes.
- an embedded permanent magnet electric motor that improves the demagnetization resistance near the corners of the magnet while ensuring the positioning of the magnet.
- FIG. 3 is a partially enlarged view of the vicinity of the gap between the rotor cores shown in FIG. 2.
- FIG. 2 regarding Embodiment 2 of this invention.
- FIG. 3 regarding this Embodiment 2.
- FIG. 4 regarding this Embodiment 2.
- FIG. It is a figure of the same aspect as FIG. 5 regarding this Embodiment 2.
- FIG. It is a longitudinal cross-sectional view of the cylinder rotary compressor which mounts the permanent magnet embedded electric motor regarding Embodiment 3 of this invention.
- FIG. 1 is a cross-sectional view of a permanent magnet embedded electric motor according to Embodiment 1 of the present invention
- FIG. 2 is a cross-sectional view showing a rotor core shown in FIG. 1
- FIG. FIG. 4 is a partial enlarged view showing the vicinity of the interpolar portion of the rotor core of FIG. 4
- FIG. 4 is a cross-sectional view of the rotor core shown in FIG. 2 in which Nd / Fe / B rare earth magnets are accommodated.
- a plane whose perpendicular line is a rotation axis of a rotor described later is a paper surface.
- FIG. 3 priority is given to the clarity of the lines for explanation shown in the drawing, and hatching is omitted (the same applies to FIGS. 5, 7 and 9 described later).
- an embedded permanent magnet electric motor 50 includes an annular stator 1 and a rotor 100.
- the stator 1 includes an annular stator core 2 and a circumferential direction in the inner peripheral portion of the stator core 2 (circumferential direction around the rotation axis in a plane perpendicular to the rotation axis of the rotor, A plurality of slots 3 formed at equiangular pitches in the direction of the rotation trajectory of the rotor 100 and coils 4 accommodated in the slots 3 are provided.
- a rotor 100 is rotatably disposed on the inner peripheral side of the stator 1, and a cylinder is provided between the outer peripheral surface 15 of the rotor 100 (rotor core 12) and the inner peripheral surface 1 a of the stator 1.
- a void 5 is formed.
- the stator 1 shown in FIG. 1 is a distributed winding stator as an example, but may be a concentrated winding stator.
- the rotor 100 has a rotating shaft 11, a rotor core 12, and a plurality of permanent magnets 14 as main components. Rotational energy is transmitted to the rotating shaft 11 from the drive source, and the rotor core 12 provided around the rotating shaft 11 is rotated by the rotating energy.
- the rotor core 12 and the rotating shaft 11 are connected by, for example, shrink fitting and press fitting.
- the rotor core 12 is manufactured by laminating a plurality of silicon steel plates (component plates) punched into a predetermined shape with a mold in the direction in which the rotation shaft 11 extends (the front and back direction in FIG. 2).
- the outer peripheral surface 15 of the rotor core 12 is formed in a cylindrical shape.
- the rotor core 12 has six magnet housing holes 13 arranged along the circumferential direction.
- the six magnet housing holes 13 have the same shape.
- Each of the six magnet accommodation holes 13 extends over an equal angular range, and the radial positions of the respective portions of the magnet accommodation holes 13 are the same in the six magnet accommodation holes 13.
- Each of the magnet housing holes 13 has an outer demarcation line 13a and an inner demarcation line 13b in the radial direction (the direction of the radius about the rotation axis in the plane having the rotation axis of the rotor as a perpendicular) in the plane of FIG. And a pair of end lines 13c.
- the pair of end lines 13 c connects the end of the outer demarcation line 13 a and the end of the inner demarcation line 13 b in the vicinity of the outer peripheral surface 15 of the rotor core 12.
- the rotor core 12 includes an outer peripheral thin core 6 between the outer peripheral surface 15 of the rotor core 12 and each end line 13c of each magnet housing hole 13.
- the rotor core 12 By configuring the rotor core 12 in this way, the magnetic resistance in the vicinity of both end portions (end lines 13c) of the magnet housing hole 13 can be increased. Thereby, the short circuit magnetic flux of a magnet can be reduced and high torque can be realized.
- a pair of minute projections 7, a pair of large projections 8, and a pair of demagnetizing field escapes 10 are formed at both ends of the outer demarcation line 13a of each magnet housing hole 13.
- the pair of minute protrusions 7 protrudes inward in the radial direction.
- These fine protrusions 7 have a positioning function for preventing the permanent magnet 14 from shifting in the circumferential direction, and a function for preventing the demagnetizing field formed by the winding of the stator 1 from passing through the corners of the permanent magnet 14. Is provided.
- the height of the minute projection 7 is secured such that when the permanent magnet 14 is inserted, the end surface 14a in the longitudinal direction of the permanent magnet 14 and the side surface 7a of the minute projection 7 are in surface contact.
- the surface contact portion only needs to have a dimension that can prevent displacement of the permanent magnet 14 at the lower limit of the dimensional tolerance of the permanent magnet 14. In this example, it is about 0.5 mm.
- the large protrusion 8 is provided outside the minute protrusion 7 in the outer demarcation line 13a (on the side away from the permanent magnet 14, the end line 13c, and the interpolar part).
- the large protrusion 8 extends toward the inner demarcating line 13 b of the magnet housing hole 13.
- the large protrusion 8 extends toward the inner defining line 13b so as to be orthogonal to the inner defining line 13b.
- the microprojection 7 and the large projection 8 have an integrated structure that is continuously connected, and is configured to have a two-stage structure.
- the height Ta of the large protrusion 8, the height Tb of the small protrusion 7, the width of the large protrusion 8 in the longitudinal direction of the magnet is Wa
- the width of the small protrusion in the longitudinal direction of the magnet is Wb.
- the height dimension Ta of the large projection 8 and the height dimension Tb of the microprojection 7 are virtual extensions of the outer demarcation line 13a of the magnet housing hole 13 in the cross section of FIG. Dimension from line VL.
- a demagnetizing field relief hole 10 is provided that is adjacent to the microprojection 7 and has a cross-sectional contour that protrudes radially outward.
- the demagnetizing field relief 10 is recessed outward in the radial direction from the virtual extension line VL of the outer defining line 13a as seen in the cross section of FIG. Due to the presence of the demagnetizing field relief 10, the permanent magnet 14 and the magnet housing hole 13 are defined outside at the radially outer corners at both ends of the permanent magnet 14 in a state where the permanent magnet 14 is housed in the magnet housing hole 13. A non-contact space with the line 13a is secured.
- the demagnetizing field relief 10 By providing the demagnetizing field relief 10 in this way, the magnetic flux generated by the winding of the stator 1 passes through the minute projections 7 without passing through the corners of the permanent magnet 14, and the corners of the permanent magnet 14 are reduced. Magnetic proof strength can be improved.
- the inner demarcating line 13b has a linear shape not including a protruding structure, and is connected to the corresponding substantially U-shaped end line 13c via the bent portion 9 on the outer diameter side in the vicinity of the inter-electrode portion.
- FIG. 4 is a cross-sectional view in which the rare earth magnet is accommodated in the rotor core of FIG.
- a corresponding permanent magnet 14 is accommodated in each of the magnet accommodation holes 13. That is, the permanent magnets 14 constituting the magnetic poles of the rotor core 12 are arranged in the circumferential direction of the rotor core 12 by the same number as the number of poles, and are magnetized so that N poles and S poles are alternated.
- the permanent magnet 14 is a Nd / Fe / B rare earth magnet having a residual magnetic flux density of 1.2 T or more at room temperature and a J coercivity of less than 23 kOe at room temperature.
- the shape of the magnet is a flat plate shape, and the permanent magnet 14 is disposed so as to be sandwiched between the pair of minute protrusions 7.
- FIG. 5 is a conceptual diagram showing the flow of magnetic flux generated by the stator winding when a large current flows through the stator winding.
- the magnetic flux 16 is generated in the magnet accommodation hole in the rotor core 12, as shown in FIG. 13 passes through the outer iron core portion 12a on the radially outer side, avoids the corner portion on the radially outer side of the permanent magnet 14, flows into the large projection portion 8 via the minute projection portion 7, and passes from the large projection portion 8 to the magnet housing hole. 13 passes through the inner core portion 12b on the radially inner side.
- the demagnetizing field generated by the stator winding is guided to the large protrusion while the magnet is reliably positioned by the minute protrusion. Can be made. Therefore, while suppressing unintended movement of the permanent magnet, demagnetization of the corners of the permanent magnet can be suppressed, and an electric motor with less torque reduction can be provided. Moreover, the usage-amount of Dy contained in a rare earth magnet can be reduced, and the cost reduction effect can also be acquired. Furthermore, by reducing the amount of Dy used, the residual magnetic flux density of the magnet is increased, and the torque can be increased.
- FIGS. 6, FIG. 7, FIG. 8 and FIG. 9 are diagrams related to the second embodiment, respectively, in the same manner as FIG. 2, FIG. 3, FIG.
- the rotor core 112 in the embedded permanent magnet electric motor 50 according to the second embodiment is also made of a silicon steel plate (component plate) punched into a predetermined shape with a die, in the extending direction of the rotating shaft 11 (front and back in FIG. 2). In the direction).
- the outer peripheral surface 15 of the rotor core 112 is formed in a cylindrical shape.
- the rotor core 112 is formed with six magnet housing holes 113 arranged along the circumferential direction.
- the six magnet housing holes 113 have the same shape. Further, each of the six magnet accommodation holes 113 extends over an equal angular range, and the radial positions of the respective parts of the magnet accommodation holes 113 are the same in the six magnet accommodation holes 113.
- the magnet receiving holes 113 are respectively defined as the outer demarcating line 113a, the inner demarcating line 13b, the end of the outer demarcating line 113a in the vicinity of the outer peripheral surface 15 of the rotor core 112, and the inner demarcation line 113b. It has a pair of end line 13c which connects the edge part of the demarcation line 13b.
- the rotor core 112 includes an outer thin core portion 6 between the outer peripheral surface 15 of the rotor core 112 and each end line 13c of each magnet housing hole 113.
- the rotor core 112 By configuring the rotor core 112 in this way, the magnetic resistance in the vicinity of both end portions (end line 13c) of the magnet housing hole 113 can be increased. Thereby, the short circuit magnetic flux of a magnet can be reduced and high torque can be realized.
- the outer demarcation line 113a is provided with a minute projection 107 projecting radially inward.
- the minute projection 107 has a positioning function for preventing the permanent magnet 14 from shifting in the circumferential direction, and a function for preventing the demagnetizing field formed by the winding of the stator 1 from passing through the corner of the permanent magnet 14.
- the height of the minute projection 107 is secured such that when the permanent magnet 14 is inserted, the end surface 14a in the longitudinal direction of the permanent magnet 14 and the side surface 107a of the minute projection 107 are in surface contact.
- the surface contact portion only needs to have a dimension that can prevent displacement of the permanent magnet 14 at the lower limit of the dimensional tolerance of the magnet.
- the height of the side surface of the minute protrusion 107 is about 0.5 mm.
- a large protrusion 108 is provided on the outer side of the minute protrusion 107 on the side defining line 113a (on the side away from the permanent magnet 14, the end line 13c, and the interpolar part).
- the large protrusion 108 extends to the inner defining line 13b side of the magnet accommodation hole 113.
- the fine protrusions 107 and the large protrusions 108 have an integrated structure that is continuously connected, and are connected by continuous smooth lines.
- the integral structure of the minute protrusion 107 and the large protrusion 108 protrudes from the virtual extension line VL of the outer demarcation line 113a of the magnet housing hole 113 toward the inner demarcation line 13b.
- the line of the outer shape of the integral structure of the micro projection portion 107 and the large projection portion 108 includes the side surface 107a, the first inclined line 117, the second inclined line 119, and the most protruding end portion as seen in the cross section of FIG. 121.
- the first inclined line 117 is inclined so that the height dimension gradually increases as it goes from the pole center side to the gap side.
- the second inclined line 119 is closer to the end line 13c than the first inclined line 117, and is inclined in a direction to be positioned closer to the gap side as it approaches the inner demarcating line 13b.
- the most protuberance end 121 is a boundary between the first inclined line 117 and the second inclined line 119, is sharpened at an acute angle, and is directed near the bent portion 9.
- a demagnetizing field relief hole 10 is provided that is adjacent to the microprojection 107 and has a cross-sectional contour that protrudes radially outward. Due to the presence of the demagnetizing field relief 10, the permanent magnet 14 and the magnet housing hole 113 are defined outside at the radially outer corners at both ends of the permanent magnet 14 in a state where the permanent magnet 14 is housed in the magnet housing hole 113. A non-contact space with the line 13a is secured.
- the demagnetizing field relief 10 By providing the demagnetizing field relief 10 in this way, the magnetic flux generated by the winding of the stator 1 can pass through the minute projection 107 without passing through the corner of the permanent magnet 14, and the corner of the permanent magnet 14 can be reduced. Magnetic proof strength can be improved.
- the corresponding permanent magnet 14 is accommodated in each of the magnet accommodation holes 113. That is, the permanent magnets 14 constituting the magnetic poles of the rotor core 112 are arranged in the circumferential direction of the rotor core 112 by the same number as the number of poles, and are magnetized so that N poles and S poles are alternated.
- the magnetic flux 16 is generated in the rotor core 112 as shown in FIG. Passes through the outer iron core portion 112a on the radially outer side of the receiving hole 113, avoids the corner portion on the outer side in the radial direction of the permanent magnet 14, flows into the large protrusion portion 108 via the minute protrusion portion 107, and from the large protrusion portion 108 to the magnet It passes through the inner core part 112b on the radially inner side of the accommodation hole 113.
- the second embodiment is the same as the first embodiment described above.
- the second embodiment configured as described above also provides the same advantages as those of the first embodiment, and the demagnetizing field produced by the stator winding is large while ensuring the positioning of the magnet by the minute protrusions. It can be guided to the protrusion. Therefore, while suppressing unintended movement of the permanent magnet, demagnetization of the corners of the permanent magnet can be suppressed, and an electric motor with less torque reduction can be provided. Moreover, the usage-amount of Dy contained in a rare earth magnet can be reduced, and the cost reduction effect can also be acquired. Furthermore, by reducing the amount of Dy used, the residual magnetic flux density of the magnet is increased, and the torque can be increased.
- the microprojections and the large projections have a simpler integrated structure that is continuously connected and connected by a continuous curve. Punchability when punching with is better.
- Embodiment 3 a cylinder rotary compressor equipped with the above-described permanent magnet embedded motor will be described.
- this invention includes the compressor carrying the permanent magnet embedded electric motor in any one of Embodiment 1 and 2 mentioned above, the classification of a compressor is not limited to a rotary compressor. .
- FIG. 10 is a longitudinal sectional view of a cylinder rotary compressor equipped with a permanent magnet embedded electric motor.
- the cylinder rotary compressor 200 includes a permanent magnet embedded electric motor 50 (electric element) and a compression element 30 in the hermetic container 25.
- refrigerating machine oil that lubricates each sliding portion of the compression element 30 is stored at the bottom of the sealed container 25.
- the compression element 30 includes, as main elements, a cylinder 20 provided in a vertically stacked state, a rotating shaft 11 that is rotated by an electric motor, a piston 21 that is inserted into the rotating shaft 11, and a suction side and a compression side inside the cylinder 20. And a pair of upper and lower frames 22a and 22b, and a pair of upper and lower frames 22a and 22b, which are rotatably inserted into the vane (not shown) and close the axial end surface of the cylinder 20, respectively. Each includes a muffler 24a and 24b mounted.
- the stator 1 of the embedded permanent magnet motor 50 is directly attached and held in the sealed container 25 by a method such as shrink fitting or welding. Electric power is supplied to the coil 4 of the stator 1 from a glass terminal 26 fixed to the hermetic container 25.
- the rotor 100 is arranged through a gap provided on the inner diameter side of the stator 1, and the compression element 30 provided at the lower part of the cylinder rotary compressor 200 is arranged via the rotation shaft 11 at the center of the rotor 100. It is held in a freely rotatable state by bearings (upper frame 22a and lower frame 22b).
- the refrigerant gas supplied from the accumulator 41 is sucked into the cylinder 20 through the suction pipe 28 fixed to the sealed container 25.
- the permanent magnet embedded electric motor 50 is rotated by energization of the inverter, whereby the piston 21 fitted to the rotating shaft 11 is rotated in the cylinder 20.
- the refrigerant is compressed in the cylinder 20.
- the compressed high-temperature refrigerant passes through the mufflers 24 a and 24 b, and then rises in the sealed container 25 through the air holes of the permanent magnet embedded electric motor 50. In this way, the compressed refrigerant is supplied to the high-pressure side of the refrigeration cycle through the discharge pipe 29 provided in the sealed container 25.
- any refrigerant such as a low GWP (global warming potential) refrigerant can be applied. From the viewpoint of preventing global warming, a low GWP refrigerant is desired.
- the low GWP refrigerant there are the following refrigerants.
- HFO is an abbreviation for Hydro-Fluoro-Olefin
- Olefin is an unsaturated hydrocarbon having one double bond.
- the GFO of HFO-1234yf is 4.
- Hydrocarbon having a carbon double bond in the composition for example, R1270 (propylene).
- GWP is 3, which is smaller than HFO-1234yf, but flammability is larger than HFO-1234yf.
- a mixture containing at least one of a halogenated hydrocarbon having a carbon double bond in the composition or a hydrocarbon having a carbon double bond in the composition for example, a mixture of HFO-1234yf and R32 is there. Since HFO-1234yf is a low-pressure refrigerant, its pressure loss is large, and the performance of the refrigeration cycle (especially in an evaporator) tends to deteriorate. Therefore, a mixture with R32 or R41, which is a high-pressure refrigerant, is more effective than HFO-1234yf in practical use.
- R32 refrigerant is notable for toxicity and is not highly flammable, and thus has received particular attention. Further, when the R32 refrigerant is used for the cylinder rotary compressor 200, the internal temperature of the cylinder rotary compressor 200 is higher by about 20 ° C. or more than R410A, R407C, R22 and the like conventionally used.
- the temperature inside the cylinder rotary compressor 200 varies depending on the compression load state (rotation speed, compression load torque, refrigerant), and in the steady state where the temperature is stable, the dependence on the rotation speed is particularly high.
- the temperature rise inside the cylinder rotary compressor with respect to the rotational speed when using R410 refrigerant is 70 to 80 ° C. for medium speed operation and 90 to 110 ° C. for high speed operation, compared to 50 to 60 ° C. for low speed operation.
- the temperature inside the cylinder rotary compressor 200 increases.
- the temperature in the cylinder rotary compressor 200 is further increased by about 20 ° C. relative to the R410A refrigerant.
- the cylinder rotary compressor configured as described above uses a permanent magnet embedded type electric motor having a large demagnetization resistance, even if the J coercive force is reduced due to a rise in the temperature of the compressor, the reduction of the magnet is reduced. There is an effect that a highly reliable compressor that does not generate magnetism can be provided. Further, even when the permanent magnet embedded type electric motor is operated in a high temperature atmosphere of the cylinder rotary compressor, the amount of Dy added to the rare earth magnet is reduced, and the cost of the magnet is reduced. Since the torque of the electric motor can be increased by increasing the magnetic flux density, a highly efficient compressor can be provided.
- the embodiment of the present invention shows an example of the contents of the present invention, and can be combined with another known technique, and a part thereof is not deviated from the gist of the present invention. It is also possible to change and configure such as omitting.
- stator 10 demagnetizing field release, 12,112 rotor core, 13,113 magnet housing hole, 13a, 113a outer demarcation line, 13b inner demarcation line, 14 permanent magnet, 25 sealed container, 50 permanent magnet embedded motor , 100 rotor, 200 cylinder rotary compressor.
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Abstract
Description
図1は、本発明の実施の形態1に係る永久磁石埋込型電動機の断面図であり、図2は、図1に示される回転子鉄心を示す断面図であり、図3は、図2の回転子鉄心の極間部付近を示した部分拡大図、図4は、図2の回転子鉄心にNd・Fe・B系の希土類磁石を収容した状態の断面図である。なお、図1~図4は、後述する回転子の回転軸を垂線とする面を紙面としている。また、図3では、図中に示す説明のための線の明瞭性を優先し、ハッチングは省略する(後述する図5、図7及び図9も同趣旨)。
次に、図6~図9を用いて、本発明に係る永久磁石埋込型電動機の実施の形態2について説明する。図6、図7、図8及び図9はそれぞれ、本実施の形態2に関する、図2、図3、図4及び図5と同態様の図である。
次に、本発明の実施の形態3として、上述した永久磁石埋込型電動機を搭載したシリンダロータリ圧縮機について説明する。なお、本発明は、上述した実施の形態1及び2の何れかの永久磁石埋込型電動機を搭載した圧縮機を含むものであるが、圧縮機の種別は、ロータリ圧縮機に限定されるものではない。
(2)組成中に炭素の二重結合を有する炭化水素:例えば、R1270(プロピレン)である。尚、GWPは3で、HFO-1234yfより小さいが、可燃性はHFO-1234yfより大きい。
(3)組成中に炭素の二重結合を有するハロゲン化炭化水素または組成中に炭素の二重結合を有する炭化水素の少なくともいずれかを含む混合物:例えば、HFO-1234yfとR32との混合物等である。HFO-1234yfは、低圧冷媒のため圧損が大きくなり、冷凍サイクル(特に、蒸発器において)の性能が低下しやすい。そのため、HFO-1234yfより高圧冷媒であるR32又はR41等との混合物が実用上は有力になる。
Claims (8)
- 回転子と、
空隙を隔てて前記回転子と対向するように設置された固定子と、
前記回転子の回転子鉄心に形成された複数の磁石収容孔それぞれに挿入された複数の永久磁石とを備え、
前記磁石収容孔それぞれの外側画定ラインの両端には、一対の微小突起部と、一対の大突起部と、一対の反磁界逃がしとが形成されており、
前記永久磁石はそれぞれ、対応する一対の微小突起部に挟まれるように配置されており、
前記微小突起部はそれぞれ、径方向内側に向かって突出して、前記磁石収容孔に挿入された前記永久磁石の対応する端面と面接触し、
前記大突起部はそれぞれ、対応する前記微小突起部よりも外側に設けられ、前記磁石収容孔の内側画定ライン側に延びており、
前記大突起部及び前記微小突起部は、該大突起部の高さ寸法Ta、該微小突起部の高さ寸法Tbとしたとき、Tb<Taとなるように構成されている、
永久磁石埋込型電動機。 - 前記微小突起部と前記大突起部とは連続して連なる一体構造である、
請求項1の永久磁石埋込型電動機。 - 前記微小突起部と前記大突起部とは二段構造である、
請求項1又は2の永久磁石埋込型電動機。 - 前記大突起部及び前記微小突起部は、該大突起部の磁石長手方向でいう幅をWa、該微小突起部の磁石長手方向でいう幅をWbとしたとき、Wa<Wbとなるように構成される、
請求項1~3の何れか一項の永久磁石埋込型電動機。 - 前記微小突起部と前記大突起部とは連続して連なる一体構造であり、
前記微小突起部と前記大突起部との一体構造の外形のラインは、側面と、第1傾斜ラインと、第2傾斜ラインと、最突起端部とによって形成されており、
前記第1傾斜ラインは、極中心側から極間側へ向かうにつれ、高さ寸法が徐々に大きくなる向きに傾いている、
請求項1又は2の永久磁石埋込型電動機。 - 前記磁石収容孔における前記微小突起部の内側には、該微小突起部と隣接して径方向外側に凸となる断面輪郭で構成された反磁界逃がし穴が設けられている、
請求項1~5の何れか一項の永久磁石埋込型電動機。 - 前記永久磁石は、常温における残留磁束密度が1.2T以上、常温におけるJ保磁力が23kOe未満のNd・Fe・B系の希土類磁石である、
請求項1~6の何れか一項の永久磁石埋込型電動機。 - 密閉容器内に、電動機と、圧縮要素とを備えた圧縮機であって、
前記電動機は、請求項1~7の何れか一項の永久磁石埋込型電動機である、
圧縮機。
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CN201380074506.0A CN105191068B (zh) | 2013-03-14 | 2013-03-14 | 永久磁铁埋入型电动机以及压缩机 |
US14/773,462 US9793769B2 (en) | 2013-03-14 | 2013-03-14 | Interior permanent magnet motor, and compressor |
JP2015505159A JP5971666B2 (ja) | 2013-03-14 | 2013-03-14 | 永久磁石埋込型電動機及び圧縮機 |
PCT/JP2013/057171 WO2014141428A1 (ja) | 2013-03-14 | 2013-03-14 | 永久磁石埋込型電動機及び圧縮機 |
CN201420112959.XU CN203761160U (zh) | 2013-03-14 | 2014-03-13 | 永久磁铁埋入型电动机以及压缩机 |
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CN105191068A (zh) | 2015-12-23 |
US9793769B2 (en) | 2017-10-17 |
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US20160028278A1 (en) | 2016-01-28 |
JP5971666B2 (ja) | 2016-08-17 |
CN203761160U (zh) | 2014-08-06 |
CN105191068B (zh) | 2017-11-28 |
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