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WO2018225293A1 - Machine électrique tournante à aimants permanents et compresseur faisant appel à cette dernière - Google Patents

Machine électrique tournante à aimants permanents et compresseur faisant appel à cette dernière Download PDF

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Publication number
WO2018225293A1
WO2018225293A1 PCT/JP2018/002885 JP2018002885W WO2018225293A1 WO 2018225293 A1 WO2018225293 A1 WO 2018225293A1 JP 2018002885 W JP2018002885 W JP 2018002885W WO 2018225293 A1 WO2018225293 A1 WO 2018225293A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
axis
magnet insertion
circumferential direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/002885
Other languages
English (en)
Japanese (ja)
Inventor
高畑　良一
渉 初瀬
大我 渕野
修平 新村
和行 松永
哲也 田所
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Johnson Controls Air Conditioning Inc
Original Assignee
Hitachi Johnson Controls Air Conditioning Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Johnson Controls Air Conditioning Inc filed Critical Hitachi Johnson Controls Air Conditioning Inc
Priority to CN201880033425.9A priority Critical patent/CN110651413B/zh
Priority to KR1020197035576A priority patent/KR20200003140A/ko
Publication of WO2018225293A1 publication Critical patent/WO2018225293A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • 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
    • 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
    • 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
    • H02K1/2786—Outer rotors
    • H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2791—Surface mounted magnets; Inset magnets
    • 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
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • 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
    • 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
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
    • 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 permanent magnet type rotating electrical machine having a permanent magnet in a rotor and a compressor using the same.
  • Permanent magnet type rotating electrical machines are applied to various technical fields such as air conditioners, refrigerators, freezers, compressors in food showcases and the like.
  • concentrated winding is adopted for the stator winding that is an armature winding
  • a permanent magnet having a high magnetic flux density such as a neodymium magnet is adopted for the field magnet.
  • Increased efficiency along with the increase in output density due to miniaturization and higher efficiency, the influence of the non-linear magnetic characteristics (hysteresis) of the iron core becomes significant.
  • the reluctance torque is reduced and the spatial harmonic magnetic flux component There is an increase in iron loss accompanying this increase.
  • Patent Document 1 discloses a technique in which through holes that penetrate the rotor in the axial direction are provided on both side surfaces of a permanent magnet embedded in the rotor.
  • the reluctance torque is improved by forming an air layer having a high magnetic resistance in the through hole and extending the magnetic path by the magnetic flux flowing around the through hole.
  • an air layer having high magnetic resistance is formed by through holes formed on both sides of a permanent magnet to reduce magnetic flux leakage.
  • a permanent magnet type rotating electric machine can obtain high efficiency in a medium / low speed range such as 1000 to 3000 min ⁇ 1, but in a high speed range such as 7000 to 8000 min ⁇ 1, when a load torque is large or an electric motor
  • a medium / low speed range such as 1000 to 3000 min ⁇ 1
  • a high speed range such as 7000 to 8000 min ⁇ 1
  • the influence of the magnetic flux (q-axis magnetic flux) due to the torque current is increased, so that the voltage / current phase advances and the power factor decreases.
  • the q axis that is electrically orthogonal to the magnetic flux axis d axis of the permanent magnet passes between the through holes, and the rotor core is located here.
  • Magnetic flux leakage becomes significant, and the permanent magnet type rotating electrical machine has a problem that it cannot be controlled with high torque and high efficiency by a driving device such as an inverter.
  • a permanent magnet insertion portion into which the permanent magnet is inserted is formed in the rotor. Since this permanent magnet insertion part inserts a permanent magnet, an opening slightly larger than the permanent magnet to be inserted is formed.
  • the permanent magnet inserted from the permanent magnet insertion portion and embedded in the rotor receives a circumferential force due to acceleration / deceleration accompanying the rotation of the rotor, and tries to move in the embedded space.
  • Patent Document 1 in the technique in which through holes are formed on both sides of the permanent magnet, it is necessary to provide a protrusion or the like in the space where the permanent magnet is embedded in order to prevent the permanent magnet from moving in the circumferential direction. There is.
  • the protrusion or the magnet since the load of the permanent magnet needs to be received by the protrusion or the like, the protrusion or the magnet may be damaged due to repeated collision between the protrusion and the permanent magnet.
  • an object of the present invention is to provide a permanent magnet type rotating electrical machine that can be controlled with high efficiency even in a high speed range, and a compressor using the same.
  • an object of the present invention is to provide a permanent magnet type rotating electrical machine capable of preventing breakage of a magnet due to acceleration / deceleration accompanying rotation of a rotor, and a compressor using the same.
  • the present invention is characterized by having a stator and a rotor rotatably arranged on the outer peripheral side of the stator, the stator being radially outward from the center.
  • a plurality of teeth provided radially and armature windings wound around the plurality of teeth, the rotor extending in a circumferential direction of the rotor and penetrating in an axial direction
  • the rotor has a periphery of the rotor.
  • the present invention is characterized by having a stator and a rotor rotatably disposed on the outer peripheral side of the stator, and the stator is provided radially from the center toward the radially outer side.
  • a plurality of teeth and an armature winding wound around the plurality of teeth, and the rotor is formed to extend in the circumferential direction of the rotor and penetrate in the axial direction.
  • the rotor is adjacent to the rotor in the circumferential direction.
  • a line is provided between the permanent magnet insertion portions, the cutout portion being formed so as to be isolated from the permanent magnet insertion portion, and a line connecting the rotation center of the rotor and the circumferential central portion of the permanent magnet being d
  • the notch is the q-axis, where the axis perpendicular to the d-axis and the electrical angle is the q-axis. In that is located above.
  • the compressor includes a compression mechanism that reduces the volume of the gas that is the working fluid, and a permanent magnet type rotating electrical machine that drives the compression mechanism.
  • An armature winding wound around a tooth and the rotor has a plurality of permanent magnet insertion portions formed extending in the circumferential direction of the rotor and penetrating in the axial direction; A plurality of plate-like permanent magnets to be inserted into the magnet insertion portion, and the rotor includes a space between the permanent magnet insertion portions adjacent to each other in the circumferential direction of the rotor.
  • the concave portion is positioned on the q-axis when the line connecting the core and the central portion in the circumferential direction of the permanent magnet is the d-axis, and the axis orthogonal to the d-axis is the q-axis. .
  • the compressor includes a compression mechanism that reduces the volume of the gas that is the working fluid, and a permanent magnet type rotating electrical machine that drives the compression mechanism.
  • An armature winding wound around a tooth, and the rotor has a plurality of permanent magnet insertion portions formed extending in the circumferential direction of the rotor and penetrating in the axial direction; A plurality of plate-like permanent magnets to be inserted into the magnet insertion portion, and the rotor is between the permanent magnet insertion portions adjacent to each other in the circumferential direction of the rotor, and the permanent magnet insertion A notch formed separately from the portion, and a rotation center of the rotor Serial line connecting the circumferential direction central portion of the permanent magnet and the d-axis, and an axis orthogonal with the d-axis and the electrical angle and the q-axis is to the cutout portion was positioned on the q-axis.
  • the permanent magnet type rotating electric machine of each embodiment is composed of a 6-pole rotor and a 9-slot stator. That is, the ratio of the number of rotor poles to the number of stator slots is 2: 3.
  • the number of rotor poles, the number of stator slots, and the ratio thereof are not limited to the values in each embodiment, and other values can provide the same effects as those in each embodiment.
  • the number of poles of the rotor may be 4 poles, 8 poles, 10 poles, or the like.
  • the permanent magnet type rotating electric machine in each embodiment is a so-called embedded magnet type rotating electric machine in which a permanent magnet is embedded in a rotor core.
  • axial direction indicates the rotational axis direction of the rotor
  • radial direction indicates the radial direction of the rotor
  • circumferential direction indicates the circumferential direction of the rotor
  • FIG. 1 is a cross-sectional view of a permanent magnet type rotating electric machine according to a first embodiment of the present invention. This sectional view shows a section in a direction perpendicular to the rotation axis (the same applies to FIGS. 2 and 6 described later).
  • the first embodiment operates as a permanent magnet type synchronous motor.
  • the permanent magnet type rotating electrical machine 1 includes a stator 2 and a rotor 3 that is rotatably arranged on the outer peripheral side of the stator 2 via a predetermined gap (gap). .
  • the rotor 3 is provided with a rotor support member (not shown) having a shaft fixing portion.
  • the stator 2 includes a stator core 6 that is laminated in the axial direction, and includes an annular core back 5 and a plurality of teeth 4 that protrude radially outward from the core back 5.
  • the plurality of teeth 4 are arranged at substantially equal intervals along the circumferential direction. Slots 7 are formed between adjacent teeth 4 in the circumferential direction, and concentrated winding armature windings 8 are wound so as to surround the teeth 4.
  • the armature winding 8 is wound around the axial centers of a plurality of teeth 4 that are radially arranged from the center of the stator 2 radially outward, and in the circumferential direction, the U-phase of the three-phase winding Winding 8a, V-phase winding 8b, and W-phase winding 8c are arranged with a gap therebetween.
  • the slot pitch is 120 degrees in electrical angle.
  • a shaft hole 15 that penetrates a cylindrical shaft (not shown) is formed at the center of the stator 2.
  • the permanent magnet type rotating electrical machine 1 of the first embodiment when a three-phase alternating current is passed through the armature winding 8 composed of the three-phase windings 8a to 8c, a rotating magnetic field is generated.
  • the rotor 3 is rotated by the electromagnetic force acting on the permanent magnet 14 and the rotor core 12 by the rotating magnetic field.
  • the stator core 6 and the rotor core 12 are made of silicon steel plates. It is preferable to comprise a laminated body in which a plurality of thin plates made of magnetic steel plates are laminated.
  • FIG. 2 is a cross-sectional view showing the rotor core shape of the permanent magnet type rotating electrical machine 1 according to the first embodiment.
  • the rotor 3 is configured by laminating a rotor core 12.
  • the number is 6).
  • Each of the plurality of permanent magnet insertion portions 13 is inserted with a flat permanent magnet 14 made of a magnet material, for example, rare earth neodymium.
  • the permanent magnet insertion portion 13 is formed slightly larger than the permanent magnet 14, and the outer periphery of the permanent magnet 14 is covered with the rotor core 12.
  • the permanent magnet 14 moves through the gap of the permanent magnet insertion portion 13 due to acceleration / deceleration accompanying the rotation of the rotor 3.
  • the load acting on the permanent magnet 14 is permanent. It is received by the surface of the rotor core 12 in the magnet insertion part 13. For this reason, there is no possibility of cracks or the like in the rotor core 12 itself.
  • the permanent magnet 14 also contacts the surface of the rotor core 12 in the permanent magnet insertion portion 13, there is no possibility that the permanent magnet 14 is damaged.
  • the direction of the magnetic flux generated by the magnetic poles of the permanent magnet 14, that is, the virtual axis connecting the longitudinal center (cross section center) of the permanent magnet 14 and the rotation center O is d axis (magnetic flux).
  • Axis an axis that is electrically perpendicular to the d-axis, that is, an electrical angle (axis between permanent magnets), is defined as a q-axis.
  • the rotor core 12 is provided with one permanent magnet 14 per magnetic pole.
  • the cross-sectional shape of the permanent magnet 14 is an elongated rectangular shape like the permanent magnet insertion portion 13, and its longitudinal direction extends in a direction perpendicular to the d-axis geometrically.
  • the rotor core 12 of the rotor 3 is recessed outwardly in the radial direction from the inner peripheral surface of the rotor on the q axis between adjacent permanent magnet insertion portions 13 (between the poles of the permanent magnet 14).
  • a recess 11 is provided.
  • the recess 11 is located on the q axis and suppresses the q axis magnetic flux as will be described later.
  • the rotor 3, that is, the rotor core 12 is positioned on the inner peripheral side with respect to the recess 11, and the inner peripheral portion where the gap length (gap) between the stator 2 and the teeth 4 is the shortest g 1, and the gap And an inner peripheral portion whose length is g2 longer than g1.
  • the recess 11 has two straight portions 11b and 11c that are parallel to the circumferential length direction of the permanent magnet 14, and a curved portion 11a that connects the end portions of the two straight portions 11b and 11c on the rotor inner peripheral side. ing.
  • the curved part 11a in the recessed part 11, the influence of the stress accompanying a rotor centrifugal force can be relieved in a high speed region.
  • the curved portion 11a is smoothly connected to the two straight portions 11b and 11c.
  • stress concentration associated with the rotor centrifugal force in the recess 11 is alleviated, so that the strength of the rotor against the centrifugal force is improved.
  • the angle between the end portions of the inner peripheral side magnetic pole surface of the permanent magnet 14 constituting one magnetic pole of the rotor 3 is ⁇ p1
  • the two linear portions 11b and 11c of the recess 11 are
  • ⁇ p1 and ⁇ p2 are set so as to satisfy the relationship ⁇ p2 / ⁇ p1 ⁇ 0.5.
  • the slot pitch in the stator having concentrated windings is 120 ° in electrical angle.
  • the lower limit value is set to 0.18, and is set so as to satisfy the relationship of 0.18 ⁇ ⁇ p2 / ⁇ p1 ⁇ 0.5.
  • the rotor core 12 of the rotor 3 of the first embodiment is recessed from the inner peripheral surface of the rotor toward the radially outer side between the adjacent permanent magnet insertion portions 13 (between the poles of the permanent magnet 14).
  • a recess 11 is provided.
  • the recessed part 11 is located on the q-axis. Since the air layer is formed by the recess 11 and the magnetic resistance is increased by the air layer, it is difficult for the magnetic flux to pass between the permanent magnet insertion portions 13 (permanent magnets 14) adjacent in the circumferential direction.
  • the leakage magnetic flux from between the permanent magnets 14 can be reduced, the influence of the q-axis magnetic flux can be suppressed, and the harmonic magnetic flux generated by the interaction between the induced electromotive force and the armature current can be reduced. That is, the recess 11 suppresses the armature reaction and reduces the harmonic component of the in-machine magnetic flux.
  • the rotor 3 includes a notch portion 17 formed between the permanent magnet insertion portions 13 (permanent magnets 14) adjacent to each other in the circumferential direction and isolated from the permanent magnet insertion portion 13. This notch 17 penetrates the rotor in the axial direction.
  • the notch 17 Since an air layer is formed by the notch 17 and the magnetic resistance is increased by the air layer, it is difficult for the magnetic flux to pass between the permanent magnet insertion portions 13 (permanent magnets 14) adjacent in the circumferential direction. And the notch part 17 is located on the q-axis. For this reason, the leakage magnetic flux from between the permanent magnets 14 can be reduced, the influence of the q-axis magnetic flux can be suppressed, and the harmonic magnetic flux generated by the interaction between the induced electromotive force and the armature current can be reduced. That is, the notch portion 17 suppresses the armature reaction and reduces the harmonic component of the in-machine magnetic flux.
  • the permanent magnet 14 passes through the gap of the permanent magnet insertion portion 13 due to acceleration / deceleration accompanying the rotation of the rotor 3. Even if it moves, there is no fear of cracks or the like in the rotor core 12 itself, and neither the permanent magnet 14 nor the permanent magnet 14 is damaged.
  • FIGS. 3a and 3b are vector diagrams of a permanent magnet type rotating electrical machine which is a comparative example according to the conventional invention. Note that FIG. 3A shows a low speed / low load torque, and FIG. 3B shows a high speed / high load torque.
  • the vector diagrams of FIGS. 3a and 3b use the dq axis coordinate system for controlling the permanent magnet type rotating electrical machine, and the d axis direction of this coordinate system is the d axis direction of the rotor (see FIG. 2). ).
  • ⁇ m represents a magnetic flux in the d-axis direction of the rotor by the permanent magnet 14.
  • ⁇ d and ⁇ q indicate the magnetic flux due to the d-axis component and the q-axis component of the armature current I1 flowing through the stator winding, that is, the d-axis magnetic flux and the q-axis magnetic flux, respectively.
  • ⁇ 1 indicates the magnetic flux of the entire permanent magnet type rotating electric machine, that is, the main magnetic flux, which is composed of the magnetic flux ⁇ m by the permanent magnet and the magnetic flux ( ⁇ d, ⁇ q) by the armature current I1.
  • Em represents an induced voltage at no load.
  • V1 indicates the terminal voltage of the stator winding, and the phase difference is 90 ° with respect to the main magnetic flux ⁇ 1.
  • V1 is represented by a combined vector of the induced voltage Em and a voltage drop ( ⁇ d, ⁇ q: ⁇ is an output angular frequency of the inverter) due to the d-axis component and the q-axis component of the armature current I1.
  • FIG. 4 is a vector diagram of the permanent magnet type rotating electric machine according to the first embodiment.
  • FIG. 4 shows the vectors of the permanent magnet type rotating electrical machine of the first embodiment when the high speed and high load torque are applied, and the vectors ( ⁇ 1 ′, I1 ′, V1 ′) shown by broken lines.
  • the armature current I1 is increased.
  • the influence of the q-axis magnetic flux ⁇ q can be suppressed. For this reason, even at the time of high speed and high load torque, a decrease in the power factor is suppressed, and a desired torque can be obtained while maintaining a relatively high efficiency.
  • the means for increasing the magnetic resistance in the q-axis direction in the first embodiment that is, the configuration of the recess 11 and the notch 17 which are means for reducing the q-axis magnetic flux will be described more specifically.
  • the gap length g ⁇ b> 2 between the radially inner end of the recess 11 in which the rotor 3 is formed on the q-axis and the teeth 4 of the stator 2 is the gap length on the d-axis side. It is set to be larger than g1. That is, in the inner periphery of the rotor 3, the recess 11 has a portion where the gap length with the teeth 4 of the stator 2 is the shortest g1 and a portion where the gap length is longer than g1 and g2. . Further, as shown in FIG.
  • the recess 11 includes two straight portions (11 b and 11 c) parallel to the circumferential length direction of the permanent magnet 14, and end portions on the rotor inner peripheral side of these straight portions. And a curved portion (11a) connecting the two. In this way, the inner periphery of the rotor 3 is configured.
  • the curved part 11a of the inner peripheral side located so that it may follow a rotation direction between the adjacent permanent magnets 14, and the rotation direction side from the edge part of the rotation direction of the curved part 11a of the inner peripheral side
  • a linear portion 11b on the substantially linear rotational direction side that extends so as to extend in the direction opposite to the end portion on the anti-rotational direction side of the curved portion 11a on the inner peripheral side, and a substantially linear anti-linear portion located so as to spread in the counter rotational direction side.
  • the straight portion 11c on the rotation direction side is connected. That is, the distance between the central portion of the curved portion 11 a of the recess 11 and the rotation center O is longer than the distance between the permanent magnet 14 and the rotation center O.
  • the rotor 3 may rotate counterclockwise.
  • the magnetic flux of the permanent magnet 14 can be collected in the vicinity of the d-axis.
  • the angle ⁇ p2 between the end portions is set to satisfy 0.18 ⁇ ⁇ p2 / ⁇ p1 ⁇ 0.5, and the rotor 3 is penetrated in the axial direction on the side surface of the permanent magnet insertion portion 13 (permanent magnet 14). It is possible to increase the q-axis magnetic resistance by forming the notch 17 to be formed. Therefore, as shown in FIG.
  • the phase difference between the voltage (V1 ') and the current (I1') and the phase difference between the main magnetic flux ⁇ 1 and the magnetic flux ⁇ m of the permanent magnet are reduced. Thereby, a high torque is obtained in a high speed region. Further, when the inductance of the permanent magnet type rotating electrical machine is large, it is possible to suppress a power factor decrease due to the influence of the armature reaction. As a result, it is possible to reduce the size and increase the efficiency of the permanent magnet type rotating electrical machine while suppressing a decrease in torque.
  • FIG. 5 shows the torque characteristics (solid line) of the permanent magnet type rotating electrical machine of the first embodiment.
  • the vertical axis and the horizontal axis are torque and armature current, respectively.
  • the rated current is 1P. U.
  • the torque (high-speed torque) of Example 1 when the rated current is passed is 1 P.V. U. It is said.
  • the torque characteristics of a permanent magnet type rotating electrical machine according to the conventional invention are indicated by broken lines.
  • the torque of the permanent magnet type rotating electric machine of the first embodiment is larger than that of the comparative example according to the conventional invention, and is particularly large in the high speed range.
  • a recess 11 that is recessed radially outward from the inner peripheral surface of the rotor 3 is provided between adjacent permanent magnet insertion portions 13 (between the poles of the permanent magnet 14). Since the recess 11 is positioned on the q-axis, the power factor decrease due to the influence of the armature reaction is suppressed, and the torque decrease in the high speed range can be suppressed. For this reason, the permanent magnet type rotating electrical machine can be made highly efficient and downsized.
  • a notch portion 17 is provided between the adjacent permanent magnet insertion portions 13 (between the poles of the permanent magnet 14), and is formed so as to be isolated from the permanent magnet insertion portion 13. Since the notch 17 is positioned on the q-axis, the power factor decrease due to the influence of the armature reaction is suppressed, and the torque decrease in the high speed region can be suppressed. For this reason, the permanent magnet type rotating electrical machine can be made highly efficient and downsized.
  • both the recess 11 and the notch 17 are provided in the rotor 3, but either the recess 11 or the notch 17 may be provided.
  • FIG. 6 is a cross-sectional view of the rotor core shape of the permanent magnet type rotating electric machine according to the second embodiment of the present invention.
  • FIG. 6 the same reference numerals as those in FIG. 2 indicate the same constituent elements or constituent elements having similar functions. Hereinafter, points different from the first embodiment will be mainly described.
  • the second embodiment is different from the first embodiment (FIG. 2) in that two permanent magnets are provided for each magnetic pole of the rotor 3.
  • a permanent magnet is used as in the first embodiment, heat loss due to eddy current becomes a problem.
  • the frequency and fluctuation range of the fluctuating magnetic field applied to the magnet increase, and the heat loss increases accordingly.
  • the permanent magnet 14 embedded in the permanent magnet insertion portion 13 is divided and arranged in this embodiment (14a, 14b).
  • the magnetic flux linked to the individual magnets is reduced. Therefore, the eddy current density of each of the divided permanent magnets 14a and 14b is reduced, and the eddy current loss as a total amount is reduced.
  • the permanent magnets 14 (14a, 14b) embedded in the permanent magnet insertion portion 13 are divided and arranged, loss due to eddy current can be reduced.
  • the concave portion 11 is provided between the adjacent permanent magnet insertion portions 13 (between the poles of the permanent magnet 14). Since the recess 11 is positioned on the q-axis, the power factor decrease due to the influence of the armature reaction is suppressed, and the torque decrease in the high speed range can be suppressed.
  • a notch portion 17 is provided between the adjacent permanent magnet insertion portions 13 (between the poles of the permanent magnet 14), and is formed so as to be isolated from the permanent magnet insertion portion 13. Since the notch 17 is positioned on the q-axis, the power factor decrease due to the influence of the armature reaction is suppressed, and the torque decrease in the high speed range can be suppressed. For this reason, the permanent magnet type rotating electrical machine can be made highly efficient and downsized.
  • both the recess 11 and the notch 17 are provided in the rotor 3, but either the recess 11 or the notch 17 may be provided.
  • FIG. 7 is a cross-sectional view of a compressor according to Embodiment 3 of the present invention.
  • a spiral wrap 62 standing upright on the end plate 61 of the fixed scroll member 60 and a spiral wrap 65 standing upright on the end plate 64 of the orbiting scroll member 63 mesh with each other in the cylindrical compression container 69.
  • a compression mechanism is provided, and the orbiting scroll member 63 orbits through the crankshaft 72 by a permanent magnet type rotating electrical machine to perform the compression operation.
  • Example 1 or Example 2 of the present invention is applied as this permanent magnet type rotating electrical machine.
  • the compression chamber located on the outermost side is the fixed scroll member 60 and the orbiting scroll member 63 along with the orbiting motion.
  • the volume gradually decreases.
  • the permanent magnet type rotating electrical machine that drives the compressor is controlled by a separate inverter (not shown) and rotates at a rotation speed suitable for the compression operation.
  • the permanent magnet type rotating electrical machine includes the stator 2 and the rotor 3, and the crankshaft 72 is attached to the shaft hole 15 in the first and second embodiments.
  • the orbiting scroll member 63 does not rotate, but performs orbiting and revolving motion having a predetermined eccentric amount at the upper portion of the crankshaft 72 as a radius.
  • An oil hole 74 is provided in the crankshaft 72, and as the crankshaft 72 rotates, the lubricating oil in the oil reservoir 73 at the lower part of the compression container 69 is supplied to the slide bearing 75 through the oil hole 74.
  • the ambient temperature of the permanent magnet type rotating electric machine is often 80 ° C. or more.
  • the ambient temperature of the permanent magnet type rotating electrical machine further rises as the adoption of R32 refrigerant having a smaller global warming potential progresses.
  • the permanent magnet 14, particularly a neodymium magnet has a residual magnetic flux density that decreases at a high temperature, and an armature current increases to ensure the same output. Therefore, the permanent magnet type rotating electric machine according to the first or second embodiment described above. By applying, efficiency reduction can be suppressed.
  • the type of refrigerant is limited. It is not a thing.
  • the type of compressor the example of the scroll compressor has been described in the third embodiment, but the present invention can also be applied to a compressor having other compression mechanisms such as a rotary compressor and a reciprocating compressor. .
  • a compressor capable of saving energy can be realized by applying a small and highly efficient permanent magnet type rotating electrical machine.
  • the permanent magnet type rotating electric machine according to the first and second embodiments the operating range can be expanded such that the compressor can be operated at high speed.
  • leakage from gaps in the compressor is larger than refrigerants such as R22, R407C, and R410A, and the ratio of leakage to the circulation rate is large particularly during low-speed operation. Decreases.
  • refrigerants such as He and R32
  • leakage from gaps in the compressor is larger than refrigerants such as R22, R407C, and R410A, and the ratio of leakage to the circulation rate is large particularly during low-speed operation. Decreases.
  • the permanent magnet type rotating electrical machine 1 of the first and second embodiments described above to the compressor, it is possible to increase the maximum torque and the maximum number of rotations, and to reduce the loss in the high speed range. Therefore, the efficiency can be improved when a refrigerant such as He or R32 is used.
  • the efficiency of the compressor can be improved by applying the permanent magnet type rotating electric machine of the first embodiment or the second embodiment to the compressor.
  • the present invention is not limited to the first to third embodiments described above, and includes various modifications.
  • the above-described first to third embodiments are described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described in order to realize the present invention. Further, it is possible to add / delete / replace other configurations for a part of the configurations of the first to third embodiments.
  • SYMBOLS 1 Permanent magnet type rotary electric machine, 2 ... Stator, 3 ... Rotor, 4 ... Teeth, 5 ... Core back, 6 ... Stator core, 7 ... Slot, 8a, 8b, 8c ... Three-phase winding, 11 ... Recessed part, 12 ... Rotor core, 13 ... Permanent magnet insertion part, 14 ... Permanent magnet, 15 ... Shaft hole, 17 ... Notch part, 60 ... Fixed scroll member, 61, 64 ... End plate, 62, 65 ... Spiral wrap 63 ... Orbiting scroll member, 66a, 66b ... Compression chamber, 67 ... Discharge port, 68 ... Frame, 69 ... Compression container, 70 ... Discharge pipe, 72 ... Crankshaft, 73 ... Oil reservoir, 74 ... Oil hole, 75 ... Slide bearings

Landscapes

  • 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)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

La présente invention vise à fournir une machine électrique tournante à aimants permanents pouvant être commandée de manière très efficace même dans une zone à grande vitesse. À cet effet, la présente invention comprend la configuration suivante. Un rotor (3) placé sur le côté circonférentiel externe d'un stator est pourvu : d'une pluralité de parties d'insertion d'aimant permanent (13) s'étendant dans la direction circonférentielle du rotor (3) et formées de façon à pénétrer dans la direction axiale ; et d'une pluralité d'aimants permanents (14) tabulaires insérés dans les parties d'insertion d'aimant permanent (13). Le rotor (3) comprend également une partie enfoncée (11) formée entre les parties d'insertion d'aimant permanent (13) adjacentes dans la direction circonférentielle et enfoncée vers l'extérieur dans la direction radiale à partir de la surface circonférentielle interne du rotor (3). Quand la ligne reliant le centre de rotation du rotor (3) et la partie centrale des aimants permanents (14) dans la direction circonférentielle est définie comme un axe d et que l'axe orthogonal à l'axe d dans l'angle électrique est défini comme un axe q, la partie enfoncée (11) est située sur l'axe q. En outre, une partie découpée (17) formée séparément des parties d'insertion d'aimant permanent (13) est placée entre les parties d'insertion d'aimant permanent (13) adjacentes dans la direction circonférentielle et est située sur l'axe q.
PCT/JP2018/002885 2017-06-07 2018-01-30 Machine électrique tournante à aimants permanents et compresseur faisant appel à cette dernière Ceased WO2018225293A1 (fr)

Priority Applications (2)

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CN201880033425.9A CN110651413B (zh) 2017-06-07 2018-01-30 永磁式旋转电机以及使用该永磁式旋转电机的压缩机
KR1020197035576A KR20200003140A (ko) 2017-06-07 2018-01-30 영구 자석식 회전 전기 기기 및 그것을 사용한 압축기

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JP2017112290A JP6518720B2 (ja) 2017-06-07 2017-06-07 永久磁石式回転電機及びそれを用いた圧縮機
JP2017-112290 2017-06-07

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US11397882B2 (en) 2016-05-26 2022-07-26 Becton, Dickinson And Company Molecular label counting adjustment methods

Citations (4)

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JPH11146586A (ja) * 1997-11-04 1999-05-28 Railway Technical Res Inst 永久磁石式電動機
JP3063451U (ja) * 1998-10-26 1999-11-05 株式会社ヒノ・カンパニー 密閉型冷凍機の電動機
JP2007244026A (ja) * 2006-03-06 2007-09-20 Daikin Ind Ltd 回転電機
WO2007123057A1 (fr) * 2006-04-17 2007-11-01 Panasonic Corporation Moteur

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Publication number Priority date Publication date Assignee Title
JP2009136075A (ja) 2007-11-29 2009-06-18 Hiroshi Shimizu アウターロータモータ
JP5490559B2 (ja) * 2010-02-16 2014-05-14 日立オートモティブシステムズ株式会社 回転子およびその回転子を用いた回転電機
JP6002625B2 (ja) * 2013-04-26 2016-10-05 株式会社日立産機システム 永久磁石同期機およびこれを用いた圧縮機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11146586A (ja) * 1997-11-04 1999-05-28 Railway Technical Res Inst 永久磁石式電動機
JP3063451U (ja) * 1998-10-26 1999-11-05 株式会社ヒノ・カンパニー 密閉型冷凍機の電動機
JP2007244026A (ja) * 2006-03-06 2007-09-20 Daikin Ind Ltd 回転電機
WO2007123057A1 (fr) * 2006-04-17 2007-11-01 Panasonic Corporation Moteur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11397882B2 (en) 2016-05-26 2022-07-26 Becton, Dickinson And Company Molecular label counting adjustment methods

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KR20200003140A (ko) 2020-01-08
JP2018207704A (ja) 2018-12-27
JP6518720B2 (ja) 2019-05-22
CN110651413A (zh) 2020-01-03
CN110651413B (zh) 2021-06-29

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