WO2015166532A1 - ロータ、永久磁石埋込型電動機および圧縮機 - Google Patents
ロータ、永久磁石埋込型電動機および圧縮機 Download PDFInfo
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- WO2015166532A1 WO2015166532A1 PCT/JP2014/061869 JP2014061869W WO2015166532A1 WO 2015166532 A1 WO2015166532 A1 WO 2015166532A1 JP 2014061869 W JP2014061869 W JP 2014061869W WO 2015166532 A1 WO2015166532 A1 WO 2015166532A1
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- slit
- magnet insertion
- rotor
- insertion hole
- magnet
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/0085—Prime movers
-
- 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]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
- F04C2210/263—HFO1234YF
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
- F04C2210/268—R32
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to a rotor, a permanent magnet embedded electric motor, and a compressor.
- Patent Document 1 discloses a permanent magnet embedded electric motor in which a plurality of slits are provided on the outer side in the radial direction than the magnet insertion hole in the rotor.
- the harmonic component of the magnetic flux density waveform is reduced by the action of the slit, the harmonic of the induced voltage and the cogging torque are reduced, and it can be expected to reduce noise and vibration.
- the present invention has been made in view of the above, and an object of the present invention is to provide a rotor capable of reducing noise and vibration while reducing loss of magnetic flux generated from a magnet.
- the present invention for achieving the above-described object is a rotor including a rotor core, a shaft, and a plurality of permanent magnets, wherein the rotor core is configured by laminating a plurality of steel plates, A plurality of magnet insertion holes are provided, and at least one slit is provided between the outer peripheral surface of the core and an outer line of at least one of the magnet insertion holes, and the rotation center line is a perpendicular line.
- the end shape of the slit on the magnet insertion hole side is a triangle, the triangle protrudes toward the magnet insertion hole side, and the slit inner line of the slit is the apex of the triangle And two sides of the triangle sandwiching the apex, and a pair of side ends that are opposite ends of the apexes on each of the two sides, and the pair of side ends of the slit
- the distance between each and the magnet insertion hole is larger than the distance between the apex of the slit and the magnet insertion hole, and the distance between the apex and the magnet insertion hole is the plate of the steel plate constituting the rotor core. Greater than thickness.
- a permanent magnet embedded type electric motor of the present invention for achieving the same object includes a stator and the above-described rotor of the present invention that is rotatably provided facing the stator. Furthermore, the compressor of this invention for achieving the said objective is equipped with the permanent magnet embedded electric motor of this invention mentioned above and the compression element in the airtight container.
- FIG. 1 It is a figure which shows the cross section orthogonal to the rotation centerline of the permanent magnet embedded electric motor of Embodiment 1 of this invention. It is a figure which shows the rotor in the permanent magnet embedded type electric motor of FIG. It is a figure which expands and shows the peripheral part of one permanent magnet in the rotor of FIG. It is a figure which expands and shows the some slit of FIG. It is a figure which shows typically the flow of magnetic flux in case the space
- FIG. 1 is a view showing a cross section orthogonal to the rotation center line of the permanent magnet embedded electric motor according to Embodiment 1 of the present invention.
- FIG. 2 is a view showing a rotor in the permanent magnet embedded electric motor of FIG. 1.
- FIG. 3 is an enlarged view showing a peripheral portion of one permanent magnet in the rotor of FIG.
- FIG. 4 is an enlarged view showing a plurality of slits in FIG.
- the embedded permanent magnet electric motor 1 includes a stator 3 and a rotor 5 that is rotatably provided facing the stator.
- the stator 3 has a plurality of tooth portions 7. Each of the plurality of tooth portions 7 is adjacent to another tooth portion 7 via a corresponding slot portion 9.
- the plurality of tooth portions 7 and the plurality of slot portions 9 are arranged so as to be alternately arranged at equal intervals in the circumferential direction.
- a known stator winding (not shown) is wound around each of the plurality of tooth portions 7 in a known manner.
- the rotor 5 has a rotor core 11 and a shaft 13.
- the shaft 13 is connected to the axial center portion of the rotor core 11 by shrink fitting, press fitting, or the like, and transmits rotational energy to the rotor core 11.
- An air gap 15 is secured between the core outer peripheral surface 25 of the rotor 5 and the inner peripheral surface of the stator 3.
- the rotor 5 is held inside the stator 3 via the air gap 15 so as to be rotatable about the rotation center line CL. Specifically, a current of a frequency synchronized with the command rotational speed is supplied to the stator 3 to generate a rotating magnetic field and rotate the rotor 5.
- the stator 3 has a stator core 17.
- the stator core 17 is formed by punching relatively thin electromagnetic steel sheets into a predetermined shape and laminating a predetermined number of electromagnetic steel sheets while being fastened with caulking.
- the stator core 17 is radially formed with nine slot portions 9 at substantially equal intervals in the circumferential direction on the inner diameter side thereof.
- a region between adjacent slot portions 9 in the stator core 17 is referred to as a teeth portion 7.
- Each of the tooth portions 7 extends in the radial direction and protrudes toward the rotation center line CL. Further, most of the tooth portion 7 has a substantially equal circumferential width from the radially outer side to the radially inner side, but the tooth tip portion is located at the tip end that is the radially inner side of the tooth portion 7. 7a.
- Each of the tooth tip portions 7a is formed in an umbrella shape in which both side portions extend in the circumferential direction.
- a stator winding (not shown) constituting a coil (not shown) for generating a rotating magnetic field is wound around the teeth portion.
- the coil is formed by winding a magnet wire directly around a magnetic pole tooth through an insulator. This winding method is called concentrated winding.
- the coil is connected to a three-phase Y connection.
- the number of turns and the wire diameter of the coil are determined according to the required characteristics (rotation speed, torque, etc.), voltage specifications, and the cross-sectional area of the slot.
- the divided teeth are spread in a strip shape to facilitate winding, and a magnet wire with an appropriate wire diameter is wound around each magnetic pole tooth for a predetermined turn, and after winding, the divided teeth are rounded and welded to form a stator. is doing.
- the rotor core 11 is also formed by punching a relatively thin electromagnetic steel plate (for example, the same thickness as the electromagnetic steel plate of the stator core 17) into a predetermined shape and fastening a predetermined number of electromagnetic steel plates with caulking. It is constructed by stacking.
- each permanent magnet 19 is curved in an arc shape, and is arranged so that the convex portion side of the arc shape faces the center side of the rotor 5.
- the rotor core 11 has a number (six) of magnet insertion holes 21 corresponding to a plurality (six) of permanent magnets 19, and each of the plurality of magnet insertion holes 21 corresponds to each of the magnet insertion holes 21.
- a permanent magnet 19 is inserted. That is, the plurality of permanent magnets 19 and the plurality of magnet insertion holes 21 are both formed in an arc shape that is convex toward the center side of the rotor 5. As shown in FIGS. 1 and 2, one permanent magnet 19 is inserted into one magnet insertion hole 21.
- the number of magnetic poles of the rotor 5 may be any number as long as it is two or more, but in this example, the case of six poles is illustrated.
- At least one slit is formed between the core outer peripheral surface 25 of the rotor 5 and the hole outer lines to be described later of the magnet insertion holes 21, but in the first embodiment, as an example, a plurality of slits (more specifically, four slits) are formed for each of the six magnetic poles.
- Each of the permanent magnets 19 has an inner outer surface 43, an outer outer surface 45, and a pair of side outer surfaces 47 as viewed from a surface having the rotation center line CL as a perpendicular line. It should be noted that the outer side and the inner side of the inner outer surface and the outer outer surface indicate whether they are the inner side or the outer side in the radial direction in a relative comparison when viewed from a plane having the rotation center line CL as a perpendicular line.
- each of the magnet insertion holes 21 has a hole inner line 53, a hole outer line 55, and a pair of hole side lines 57 as the outline of the hole when viewed from the plane having the rotation center line CL as a perpendicular line.
- the outer side and the inner side of the hole inner line and the hole outer line also indicate whether they are the radially inner side or the outer side in a relative comparison with respect to the plane having the rotation center line CL as a perpendicular line. To do.
- the hole outer line 55 is configured by a first arc with a first arc radius.
- the hole inner line 53 is configured by a second arc having a second arc radius larger than the first arc radius.
- the first arc radius and the second arc radius have a common radius center, and the common radius center is on the outer side in the radial direction than the permanent magnet 19 and the magnet insertion hole 21 and corresponds. It exists on the magnetic pole center line ML.
- the hole inner line 53 and the hole outer line 55 are configured concentrically, and the center of the first arc and the center of the second arc coincide with the alignment center (orientation focal point) of the permanent magnet.
- pair of side outer surfaces 47 respectively connect corresponding end portions of the inner outer surface 43 and the outer outer surface 45 as viewed in FIG. 3, and the pair of hole side lines 57 respectively correspond to the hole inner lines as viewed in FIG. 53 and the corresponding ends of the hole outer line 55 are connected to each other.
- a portion between the core outer peripheral surface 25 and each hole side line 57 of the magnet insertion hole 21 is a thin inter-wall portion 35 having a uniform thickness.
- Each of these thin inter-electrode portions 35 serves as a leakage magnetic flux path between adjacent magnetic poles, and is preferably as thin as possible.
- the minimum width that can be pressed is set to about the thickness of the electromagnetic steel sheet.
- All of the four slits 72a, 72b, 72c and 72d are holes extending in a direction parallel to the corresponding magnetic pole center line ML and penetrating the rotor core 11 in the direction of the rotation center line CL.
- the slits 72a, 72b, 72c, and 72d have a slit inner line 73, a slit outer line 75, and a pair of slit side lines 77 as the outline of the slit as viewed from the plane having the rotation center line CL as a perpendicular line. ing. It should be noted that the outer side and the inner side of the slit inner line and the slit outer line also indicate whether the inner side or the outer side in the radial direction is a relative comparison with respect to the plane having the rotation center line CL as a perpendicular line. To do.
- each of the slits 72a, 72b, 72c and 72d is a triangle. That is, the slit inner lines 73 of the slits 72a, 72b, 72c, and 72d are respectively a triangular vertex 73a that protrudes toward the magnet insertion hole 21, the two sides of the triangle that sandwich the vertex 73a, and the two sides. A pair of side end portions 73b and 73c that are opposite to the apex of each other are included.
- the triangle is an isosceles triangle
- the slit inner line 73 is a line centered on a virtual line extending in parallel with the corresponding magnetic pole center line ML and passing through the vertex 73a. It is formed symmetrically.
- the slit outer line 75 extends substantially along the core outer peripheral surface 25.
- the pair of slit side lines 77 extends along the corresponding magnetic pole center line ML.
- the ends of the slit inner line 73 connected to the pair of slit side lines 77 are the pair of side end portions 73b and 73c described above.
- the end portions of the slits 72a, 72b, 72c and 72d on the magnet insertion hole side each have a vertex 73a and a pair of side end portions 73b and 73c, and are surfaces having the rotation center line CL as a perpendicular line.
- T3 Is larger than the interval (interval in the direction of the corresponding magnetic pole center line ML) between the apex 73a and the hole outer line 55 of the magnet insertion hole 21 (T1 ⁇ T2 and T1 ⁇ T3).
- the interval T1 between the apex 73a of each of the slits 72a, 72b, 72c and 72d and the hole outer line 55 of the magnet insertion hole 21 is larger than the plate thickness of the electromagnetic steel plate constituting the rotor core 11.
- FIG. 5 shows a mode in which the distance between the magnet insertion hole and the slit inner line is constant.
- the magnetic flux on the slit end side passes through the rotor core so as to avoid the slit, but the magnetic flux in the center of the slit also passes avoiding the slit, so the magnet insertion hole and the slit If the thickness between the two is thin, magnetic saturation occurs and magnetic flux loss occurs.
- the interval between the end of the slit on the magnet insertion hole side and the magnet insertion hole is changed in the slit width direction (corresponding magnetic pole center).
- the magnetic flux generated from the magnet facing the central portion in the slit width direction can be efficiently taken into the rotor core with low loss.
- the interval between the end of the slit and the magnet insertion hole can be increased from the center in the slit width direction toward the end in the width direction.
- the following differences occur between the triangle of FIG. 6 and the arc of FIG. That is, as shown in FIG. 8, there is a difference in the hatched area indicated by symbol A in the triangle occupied by the slit in the rotor core between the triangle shown in FIG. 6 and the arc shown in FIG. This hatched area occurs regardless of the opening angle ⁇ (0 ° ⁇ ⁇ 180 °) of the slit end.
- FIG. 8 shows an example in which the opening angle ⁇ is increased as an example.
- the magnetic flux of the magnet at the center in the slit width direction flows from the thin portion B (see FIG. 6) at the center in the slit width direction into the core and passes through the path passing through the end in the slit width direction.
- the thickness of the central part (the distance between the end of the slit on the magnet insertion hole side and the magnet insertion hole in the direction of the corresponding magnetic pole center line) is important, and the end shape of the slit is a straight triangle. It turns out to be useful. It is important that the end shape is constituted by a straight line and does not necessarily need to be an isosceles triangle. That is, it is not limited that the thickness change mode is symmetrical on both sides in the width direction of the central portion in the slit width direction.
- the thickness between the triangular vertex 73a and the magnet insertion hole 21 is more than the plate thickness of a laminated steel plate.
- the following excellent advantages can be obtained. Since at least one slit is provided between the core outer peripheral surface and the hole outer line of the magnet insertion hole, vibration and noise generated by the magnetic attractive force of the core outer peripheral surface can be suppressed. In addition, since the end shape of the slit on the magnet insertion hole side is triangular, the loss of magnetic flux generated from the portion facing the slit can be reduced, and high magnetic force can be achieved. That is, it is possible to reduce noise and vibration while reducing loss of magnetic flux generated from the magnet.
- the shape of the end of the slit on the magnet insertion hole side is made triangular, and further, the end of the slit on the magnet insertion hole side and the magnet insertion hole are not connected in the air region (slit Between the end of the magnet insertion hole side and the magnet insertion hole so that the rotor core exists over the entire width direction of the slit), thereby ensuring the rigidity of the rotor core and promoting the magnet of the slit Generation of magnetic flux loss due to the presence of an air region between the end on the insertion hole side and the magnet insertion hole is avoided.
- Embodiment 2 a rotary compressor equipped with the above-described permanent magnet embedded electric motor according to the first embodiment will be described.
- this invention includes the compressor carrying the permanent magnet embedded electric motor of Embodiment 1 mentioned above, the classification of a compressor is not limited to a rotary compressor.
- FIG. 10 is a longitudinal sectional view of a rotary compressor equipped with a permanent magnet embedded type electric motor.
- the rotary compressor 100 includes an embedded permanent magnet electric motor 1 (electric element) and a compression element 103 in an airtight container 101.
- refrigerating machine oil that lubricates each sliding portion of the compression element 103 is stored at the bottom of the sealed container 101.
- the compression element 103 includes, as main elements, a cylinder 105 provided in a vertically stacked state, a rotation shaft 107 that is a shaft that is rotated by the embedded permanent magnet electric motor 1, a piston 109 that is inserted into the rotation shaft 107, A vane (not shown) that divides the inside of the cylinder 105 into a suction side and a compression side, and a pair of upper and lower frames 111 and 113 that are rotatably inserted into the rotary shaft 107 and close the axial end surface of the cylinder 105. , And mufflers 115 respectively mounted on the upper frame 111 and the lower frame 113.
- the stator 3 of the permanent magnet embedded electric motor 1 is directly attached and held on the sealed container 101 by a method such as shrink fitting or welding. Electric power is supplied to the coil of the stator 3 from a glass terminal fixed to the sealed container 101.
- the rotor 5 is disposed on the inner diameter side of the stator 3 via a gap, and a bearing portion (an upper frame 111 and a lower frame 113) of the compression element 103 via a rotation shaft 107 (shaft 13) at the center of the rotor 5. ) Is held in a freely rotatable state.
- the refrigerant gas supplied from the accumulator 117 is sucked into the cylinder 105 through a suction pipe 119 fixed to the sealed container 101.
- the permanent magnet embedded electric motor 1 is rotated by energization of the inverter, so that the piston 109 fitted to the rotating shaft 107 is rotated in the cylinder 105.
- the refrigerant is compressed in the cylinder 105.
- the refrigerant passes through the muffler 115, the refrigerant rises in the sealed container 101. At this time, refrigeration oil is mixed in the compressed refrigerant.
- the mixture of the refrigerant and the refrigerating machine oil passes through the air holes provided in the rotor core 11, the separation of the refrigerant and the refrigerating machine oil is promoted, and the refrigerating machine oil can be prevented from flowing into the discharge pipe 121. In this way, the compressed refrigerant is supplied to the high-pressure side of the refrigeration cycle through the discharge pipe 121 provided in the sealed container 101.
- 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.
- the rotary compressor according to the second embodiment configured as described above has the same advantages as those of the first embodiment described above when the above-described permanent magnet embedded motor is used.
- Embodiment 3 FIG.
- the present invention can also be implemented as an air conditioner including the above-described compressor of the second embodiment as a component of the refrigeration circuit.
- the structure of components other than a compressor in the refrigerating circuit of an air conditioner is not specifically limited.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
さらに、同目的を達成するための本発明の永久磁石埋込型電動機は、ステータと、前記ステータに対向して回転可能に設けられた上述した本発明のロータとを備える。
さらに、同目的を達成するための本発明の圧縮機は、密閉容器内に、上述した本発明の永久磁石埋込型電動機と、圧縮要素とを備える。
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回転中心線と直交する断面を示す図である。図2は、図1の永久磁石埋込型電動機におけるロータを示す図である。図3は、図2のロータにおける一つの永久磁石の周囲部を拡大して示す図である。図4は、図3の複数のスリットを拡大して示す図である。
次に、本発明の実施の形態2として、上述した実施の形態1の永久磁石埋込型電動機を搭載した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。
(1)組成中に炭素の二重結合を有するハロゲン化炭化水素:例えば、HFO-1234yf(CF3CF=CH2)である。HFOは、Hydro-Fluoro-Olefinの略で、Olefinは、二重結合を一つ持つ不飽和炭化水素のことである。尚、HFO-1234yfのGWPは4である。
(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。
また、本発明は、上述した実施の形態2の圧縮機を冷凍回路の構成要素として含む、空調装置として実施することも可能である。なお、空調装置の冷凍回路における、圧縮機以外の構成要素の構成は、特に、限定されるものではない。
Claims (5)
- ロータコアと、シャフトと、複数の永久磁石とを備えたロータであって、
前記ロータコアは、複数の鋼板を積層して構成されており、
前記ロータコアは、複数の磁石挿入孔が設けられており、
前記コア外周面と、少なくとも一つの前記磁石挿入孔の外側ラインとの間には、少なくとも一つのスリットが設けられており、
回転中心線を垂線とする面でみて、前記スリットの磁石挿入孔側の端部形状は、三角形であり、
前記三角形は、前記磁石挿入孔側に向けて突出しており、
前記スリットのスリット内側ラインは、前記三角形の頂点と、該頂点を挟む前記三角形の2辺と、それら2辺それぞれにおける前記頂点との逆端部となる一対のサイド端部とを含んでおり、
前記スリットの前記一対のサイド端部のそれぞれと前記磁石挿入孔との間隔は、前記スリットの前記頂点と前記磁石挿入孔との間隔よりも大きく、
前記頂点と前記磁石挿入孔との前記間隔は、前記ロータコアを構成する前記鋼板の板厚よりも大きい、
ロータ。 - 前記スリットの前記磁石挿入孔側の端部形状は、二等辺三角形である、
請求項1のロータ。 - 前記複数の永久磁石及び前記複数の磁石挿入孔は、共に、前記ロータの中心側に凸となる向きの弧状に形成されている、
請求項1または2のロータ。 - ステータと、
前記ステータに対向して回転可能に設けられた、請求項1~3の何れか一項のロータとを備えた、
永久磁石埋込型電動機。 - 密閉容器内に、請求項1~4の何れか一項の永久磁石埋込型電動機と、圧縮要素とを備えた、
圧縮機。
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PCT/JP2014/061869 WO2015166532A1 (ja) | 2014-04-28 | 2014-04-28 | ロータ、永久磁石埋込型電動機および圧縮機 |
JP2016515780A JP6612215B2 (ja) | 2014-04-28 | 2014-04-28 | ロータ、永久磁石埋込型電動機および圧縮機 |
US15/122,518 US10135307B2 (en) | 2014-04-28 | 2014-04-28 | Rotor, permanent-magnet-embedded motor, and compressor |
CN201480078128.8A CN106233580B (zh) | 2014-04-28 | 2014-04-28 | 转子、永久磁铁埋入式电动机以及压缩机 |
CN201520221712.6U CN204761185U (zh) | 2014-04-28 | 2015-04-14 | 转子、永磁铁埋入式电动机以及压缩机 |
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WO2022250037A1 (ja) | 2021-05-24 | 2022-12-01 | 株式会社アイシン | 電動モーターのローター |
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CN111373631B (zh) * | 2017-11-29 | 2022-04-08 | 三菱电机株式会社 | 电动机、压缩机、空调机以及电动机的制造方法 |
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CN204761185U (zh) | 2015-11-11 |
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