WO2021172205A1 - Moteur et compresseur électrique - Google Patents

Moteur et compresseur électrique Download PDF

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Publication number
WO2021172205A1
WO2021172205A1 PCT/JP2021/006362 JP2021006362W WO2021172205A1 WO 2021172205 A1 WO2021172205 A1 WO 2021172205A1 JP 2021006362 W JP2021006362 W JP 2021006362W WO 2021172205 A1 WO2021172205 A1 WO 2021172205A1
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WO
WIPO (PCT)
Prior art keywords
motor
cylindrical
stator
overhanging
fitting portion
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Application number
PCT/JP2021/006362
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English (en)
Japanese (ja)
Inventor
真 吉田
Original Assignee
サンデン・アドバンストテクノロジー株式会社
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Publication of WO2021172205A1 publication Critical patent/WO2021172205A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • 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
    • 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
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures

Definitions

  • the present invention relates to a motor used in a compressor or the like that compresses a fluid, and an electric compressor equipped with this motor.
  • the inner core includes, for example, a cylindrical first cylindrical portion and a plurality of projecting portions extending radially outward from the outer peripheral surface of the first cylindrical portion.
  • the outer core includes, for example, a cylindrical second cylindrical portion and a plurality of groove portions recessed in the inner peripheral surface of the second cylindrical portion and the tip of the protruding portion is press-fitted. ..
  • Such a stator having a two-divided structure is disclosed in Patent Documents 1 and 2.
  • the angle is substantially perpendicular to the side surface of the protruding portion of the inner core and the inner peripheral surface of the second cylindrical portion of the outer core.
  • a portion is formed. Since the corners having a substantially right angle hinder the smooth flow of magnetic flux (in other words, the smooth flow of magnetism), there is a problem that iron loss is increased and the efficiency of the motor is lowered.
  • an object of the present invention is to improve the efficiency of the motor having the above-mentioned two-divided structure stator.
  • the motor includes a drive shaft that transmits a rotational driving force, a rotor that rotates integrally with the drive shaft, and a stator that is arranged on the outer periphery of the rotor.
  • the stator includes an inner core and an outer core that is fitted onto the inner core.
  • the inner core includes a cylindrical first cylindrical portion and a plurality of projecting portions extending radially outward from the outer peripheral surface of the first cylindrical portion.
  • the outer core includes a second cylindrical portion having a cylindrical shape, and a plurality of overhanging portions that project inward in the radial direction from the inner peripheral surface of the second cylindrical portion.
  • the projecting portion has a first fitting portion at its tip.
  • the overhanging portion has a second fitting portion at its tip.
  • the first fitting portion fits into the second fitting portion.
  • the side surface of the overhanging portion is curved and smoothly continuous with the inner peripheral surface of the second cylindrical portion.
  • the electric compressor is equipped with the motor of the first aspect described above.
  • the side surface of the overhanging portion is curved and smoothly continuous with the inner peripheral surface of the second cylindrical portion.
  • FIG. 1 shows an example of a scroll type compressor 100 in which a motor according to the present embodiment is incorporated.
  • the scroll type compressor 100 is given as an example of an electric compressor.
  • the scroll type compressor 100 is incorporated in, for example, a refrigerant circuit of a vehicle air conditioner.
  • the scroll type compressor 100 compresses and discharges a gaseous refrigerant (fluid) sucked from, for example, the low pressure side of the refrigerant circuit.
  • the scroll type compressor 100 includes a housing 200, a scroll unit 300, a motor 400, an inverter 500, and a support member 600.
  • the scroll unit 300 compresses a low-pressure gaseous refrigerant.
  • the motor 400 drives the scroll unit 300.
  • the inverter 500 controls the motor 400.
  • the support member 600 freely rotatably supports the rear portion of the drive shaft 420 extending in the front-rear direction of the motor 400 via the bearing 760.
  • the refrigerant of the refrigerant circuit for example, a CO 2 (carbon dioxide) refrigerant can be used.
  • a CO 2 (carbon dioxide) refrigerant can be used as the refrigerant of the refrigerant circuit.
  • the scroll type compressor 100 an inverter integrated type is given as an example, but an inverter-separated type may be used.
  • the housing 200 includes a front housing 220, a rear housing 240, and an inverter cover 260.
  • the front housing 220 houses the scroll unit 300, the motor 400, the inverter 500, and the support member 600.
  • the rear housing 240 is connected to the rear end of the front housing 220.
  • the inverter cover 260 is connected to the front end of the front housing 220.
  • the front housing 220, the rear housing 240, and the inverter cover 260 can be fastened and integrated by a plurality of fasteners (such as bolts) 700.
  • the front housing 220 includes a cylindrical peripheral wall portion 222 and a disk-shaped partition wall portion 224.
  • the cylindrical shape may be such that it can be visually recognized as a cylindrical shape, and for example, a rib for reinforcement, a boss for mounting, or the like may be formed on the outer peripheral surface thereof (the shape is the same below). ).
  • the internal space of the front housing 220 (the internal space of the peripheral wall portion 222) is divided into a first space 220A and a second space 220B by a partition wall portion 224. That is, the partition wall portion 224 divides the internal space of the peripheral wall portion 222 into two in the axial direction.
  • the scroll unit 300, the motor 400, and the support member 600 are housed in the first space 220A.
  • the inverter 500 is housed in the second space 220B.
  • the rear end opening of the peripheral wall portion 222 is closed by the disc-shaped rear housing 240.
  • the front end opening of the peripheral wall portion 222 is closed by the inverter cover 260.
  • a cylindrical support portion 224A extending rearward from the central portion of the rear surface of the partition wall portion 224 is formed.
  • the support portion 224A freely rotatably supports the front end portion of the drive shaft 420 of the motor 400 via a bearing 720 press-fitted into the inner peripheral surface thereof.
  • a suction port P1 for a gaseous refrigerant is formed on the peripheral wall portion 222.
  • the gaseous refrigerant from the low pressure side of the refrigerant circuit is sucked into the first space 220A of the front housing 220 via the suction port P1. Therefore, the first space 220A of the front housing 220 functions as a suction chamber H1 for the gaseous refrigerant.
  • the gas refrigerant circulates around the motor 400 to cool the motor 400.
  • the gaseous refrigerant flows as a mixed fluid containing a trace amount of lubricating oil.
  • a discharge port P2 is formed in the rear housing 240.
  • the gaseous refrigerant compressed by the scroll unit 300 is discharged from the discharge port P2 to the high pressure side of the refrigerant circuit.
  • An oil separator 740 is incorporated inside the rear housing 240.
  • the oil separator 740 has a function of separating the lubricating oil from the gaseous refrigerant compressed by the scroll unit 300.
  • the gaseous refrigerant from which the lubricating oil is separated by the oil separator 740 (including the gaseous refrigerant in which a small amount of lubricating oil remains) is discharged to the high pressure side of the refrigerant circuit via the discharge port P2.
  • the lubricating oil separated by the oil separator 740 is guided to the back pressure supply passage L1 described later.
  • the scroll unit 300 is housed behind the front housing 220.
  • the scroll unit 300 includes a fixed scroll 320 and a swivel scroll 340.
  • the fixed scroll 320 is fixed to the front surface of the rear housing 240.
  • the swivel scroll 340 is arranged in front of the fixed scroll 320.
  • the fixed scroll 320 includes a disk-shaped bottom plate 322 and an involute-curved wrap (spiral-shaped blade) 324.
  • the bottom plate 322 is fixed to the front surface of the rear housing 240.
  • the lap 324 extends from the front surface of the bottom plate 322 toward the swivel scroll 340.
  • the swivel scroll 340 includes a disk-shaped bottom plate 342 and an involute-curved wrap (spiral-shaped blade) 344.
  • the bottom plate 342 is arranged so as to face the bottom plate 322 of the fixed scroll 320.
  • the lap 344 extends from the rear surface of the bottom plate 342 toward the fixed scroll 320.
  • the fixed scroll 320 and the swivel scroll 340 are meshed so that the side wall of the lap 324 and the side wall of the lap 344 are partially in contact with each other in a state where the circumferential angles of the lap 324 and the lap 344 are deviated from each other. Therefore, in the scroll unit 300, a crescent-shaped closed space, that is, a compression chamber H2 for compressing the gaseous refrigerant is partitioned between the fixed scroll 320 and the swivel scroll 340.
  • a discharge chamber H3 is recessed in the center of the rear surface of the bottom plate 322.
  • a discharge passage L2 capable of communicating the compression chamber H2 and the discharge chamber H3 is formed through the central portion of the bottom plate 322 of the fixed scroll 320.
  • the gaseous refrigerant compressed in the compression chamber H2 is discharged to the discharge chamber H3 via the discharge passage L2 and temporarily stored in the discharge chamber H3.
  • a one-way valve 326 made of, for example, a reed valve is provided in the discharge chamber H3 (the opening end on the downstream side of the discharge passage L2). The one-way valve 326 allows the flow of the gaseous refrigerant from the compression chamber H2 to the discharge chamber H3, while blocking the flow of the gaseous refrigerant from the discharge chamber H3 to the compression chamber H2.
  • the motor 400 is, for example, a three-phase AC motor.
  • the motor 400 includes a drive shaft 420, a rotor 440, and a stator 460.
  • the stator 460 is arranged on the outer circumference of the rotor 440 (that is, radially outward of the rotor 440).
  • a direct current from a vehicle battery (not shown) is converted into an alternating current by the inverter 500 and fed to the stator 460 of the motor 400.
  • the details of the structure of an example of the stator 460 will be described later with reference to FIGS. 3 to 6.
  • the drive shaft 420 is connected to the swivel scroll 340 via a crank mechanism described later.
  • the drive shaft 420 transmits the rotational driving force of the motor 400 to the swivel scroll 340.
  • a shaft hole extending in the front-rear direction (axial direction) is formed through the center of the rotor 440, and the drive shaft 420 is press-fitted into this shaft hole.
  • the rotor 440 and the drive shaft 420 are integrated.
  • a plurality of magnets (permanent magnets) are embedded in the rotor 440 in the circumferential direction at the outer peripheral portion facing the inner peripheral surface of the stator 460.
  • the support member 600 has a bottomed cylindrical shape having the same outer diameter as the bottom plate 322 of the fixed scroll 320, extends in the front-rear direction (axial direction), and contracts in two stages from the opening side at the rear end toward the bottom wall at the front end. It has a stepped cylindrical inner peripheral surface with a diameter. Then, the swivel scroll 340 of the scroll unit 300 is housed in the space partitioned by the inner peripheral surface on the large diameter side of the support member 600. The rear end opening of the support member 600 is fixed to the bottom plate 322 of the fixed scroll 320 by, for example, a fastener (not shown). Therefore, the rear end opening of the support member 600 is closed by the fixed scroll 320. Further, the back pressure chamber H4 that presses the swivel scroll 340 against the fixed scroll 320 is partitioned by the support member 600.
  • a bearing 760 that freely rotates the rear portion of the drive shaft 420 of the motor 400 is fitted on the inner peripheral surface of the support member 600 on the small diameter side.
  • a through hole 600A for inserting the drive shaft 420 is formed in the radial center portion of the bottom wall at the front end of the support member 600.
  • a sealing member 780 is arranged between the bearing 760 and the above-mentioned bottom wall, whereby the airtightness of the back pressure chamber H4 is ensured.
  • An annular thrust plate 800 is arranged between the stepped portion of the small diameter portion and the large diameter portion and the bottom plate 342 of the swivel scroll 340 in the space defined by the inner peripheral surface on the large diameter side of the support member 600. Will be done.
  • the step portion of the support member 600 receives the thrust force from the swivel scroll 340 via the thrust plate 800.
  • a seal member 820 for ensuring the airtightness of the back pressure chamber H4 is arranged at a step portion of the support member 600 and a portion of the bottom plate 342 of the swivel scroll 340 that comes into contact with the thrust plate 800.
  • a back pressure supply passage L1 is formed in the rear housing 240, the fixed scroll 320, and the support member 600.
  • the back pressure supply passage L1 is for supplying the lubricating oil separated by the oil separator 740 to the back pressure chamber H4. Therefore, the lubricating oil supplied from the oil separator 740 to the back pressure chamber H4 is used as back pressure for pressing the swivel scroll 340 against the fixed scroll 320.
  • An orifice 840 that limits the flow rate of the lubricating oil is provided in the middle of the back pressure supply passage L1.
  • a back pressure control valve 860 is attached to the small diameter portion of the support member 600.
  • the back pressure control valve 860 adjusts the back pressure Pm of the back pressure chamber H4 by operating according to the back pressure Pm of the back pressure chamber H4 and the suction pressure Ps of the suction chamber H1. Specifically, the back pressure control valve 860 opens when the back pressure Pm of the back pressure chamber H4 rises above the target pressure, and discharges the lubricating oil of the back pressure chamber H4 to the suction chamber H1 to discharge the back pressure. The back pressure Pm of the chamber H4 is reduced.
  • the back pressure control valve 860 closes when the back pressure Pm of the back pressure chamber H4 drops below the target pressure, and stops the discharge of the lubricating oil from the back pressure chamber H4 to the suction chamber H1 to stop the discharge of the lubricating oil from the back pressure chamber H1 to the back pressure chamber H1. Increases the back pressure Pm of H4. In this way, the back pressure control valve 860 adjusts the back pressure Pm of the back pressure chamber H4 to the target pressure.
  • a refrigerant introduction passage L3 is formed between the inner peripheral surface of the peripheral wall portion 222 of the front housing 220 and the outer peripheral surface of the support member 600.
  • the refrigerant introduction passage L3 communicates the suction chamber H1 with the space H5 located on the outer peripheral portion of the scroll unit 300, and introduces the gaseous refrigerant from the suction chamber H1 into the space H5. Therefore, the pressure in the space H5 is equal to the pressure in the suction chamber H1.
  • the crank mechanism includes a cylindrical boss portion 880 protruding from the front surface of the bottom plate 342 of the swivel scroll 340, a crank pin 882 erected on the rear end surface of the drive shaft 420 in an eccentric state, and an eccentric state on the crank pin 882.
  • the eccentric bush 884 attached in the above and the slide bearing 886 fitted to the boss portion 880 are included.
  • the eccentric bush 884 is rotatably supported by the boss portion 880 via a slide bearing 886.
  • a balancer weight 888 that opposes the centrifugal force of the swivel scroll 340 is attached to the rear end of the drive shaft 420.
  • a rotation prevention mechanism for preventing the rotation of the turning scroll 340 is provided. Therefore, the swivel scroll 340 can revolve around the axis of the fixed scroll 320 via the crank mechanism in a state where its rotation is prevented.
  • FIG. 2 is a block diagram illustrating the flow of the gaseous refrigerant and the lubricating oil.
  • the gaseous refrigerant from the low pressure side of the refrigerant circuit is introduced into the suction chamber H1 via the suction port P1 and then guided to the space H5 located on the outer peripheral portion of the scroll unit 300 via the refrigerant introduction passage L3. Then, the gaseous refrigerant guided to the space H5 is taken into the compression chamber H2 of the scroll unit 300 and compressed by the volume change of the compression chamber H2.
  • the gaseous refrigerant compressed in the compression chamber H2 is discharged to the discharge chamber H3 via the discharge passage L2 and the one-way valve 326, and then is guided to the oil separator 740.
  • the gaseous refrigerant from which the lubricating oil is separated by the oil separator 740 is discharged to the high pressure side of the refrigerant circuit via the discharge port P2.
  • the lubricating oil separated by the oil separator 740 is supplied to the back pressure chamber H4 via the back pressure supply passage L1 in a state where the flow rate is limited by the orifice 840.
  • the lubricating oil supplied to the back pressure chamber H4 is discharged to the suction chamber H1 via the back pressure control valve 860.
  • FIG. 3 is a perspective view showing an example of the stator 460 having a two-divided structure.
  • FIG. 4 is a perspective view showing an example of the stator 460 to which the bobbin 466 is attached.
  • FIG. 5 is a plan view of an example of the stator 460.
  • FIG. 6 is a partially enlarged view of a portion P of FIG.
  • FIGS. 3 and 4 show a state in which the inner core 462 is being press-fitted into the outer core 464.
  • the stator 460 of the motor 400 has, for example, a two-part structure in which the inner core 462 and the outer core 464 are integrated by press fitting, as shown in FIGS. 3 to 6, for the purpose of improving the space factor of the windings. It has been adopted.
  • the inner core 462 and the outer core 464 are each composed of a plurality of laminated steel plates (for example, electromagnetic steel plates).
  • the inner core 462 is an iron core in which a cylindrical first cylindrical portion 462A and a plurality of projecting portions 462B extending radially outward from the outer peripheral surface of the first cylindrical portion 462A are integrated.
  • a rotor 440 is rotatably inserted inside the first cylindrical portion 462A with an air gap at a predetermined interval.
  • the projecting portion 462B is a rectangular parallelepiped-shaped member arranged at an equal angle around the central axis of the first cylindrical portion 462A, and has a first fitting portion 462C which is a convex fitting portion at the tip thereof. ..
  • the first fitting portion 462C includes a tenon portion 462E that projects outward in the radial direction of the inner core 462 from the tip surface 462D of the projecting portion 462B.
  • the tenon portion 462E is formed from one surface of the inner core 462 in the axial direction to the other surface.
  • the width of the tenon portion 462E (the length of the first cylindrical portion 462A in the circumferential direction) is shorter than the width of the tip surface 462D of the projecting portion 462B (the length of the first cylindrical portion 462A in the circumferential direction). That is, the first fitting portion 462C has a convex shape due to the tip surface 462D and the tenon portion 462E of the projecting portion 462B. Further, the first fitting portion 462C has a convex cross-sectional shape and extends from one surface of the inner core 462 in the axial direction to the other surface.
  • the bobbin 466 in which the winding is wound is inserted and fixed from the outside of the tip (first fitting portion 462C) of the protruding portion 462B of the inner core 462.
  • the winding may be wound directly around the projecting portion 462B without using the bobbin 466.
  • 12 projecting portions 462B are provided on the outer peripheral surface of the first cylindrical portion 462A, but the number of projecting portions 462B takes into consideration, for example, the required characteristics of the motor 400. Can be set arbitrarily.
  • the outer core 464 fitted to the inner core 462 includes a cylindrical second cylindrical portion 464A and a plurality of overhanging portions 464B protruding inward in the radial direction from the inner peripheral surface of the second cylindrical portion 464A. It is an integrated iron core.
  • the overhanging portion 464B is formed from one surface of the outer core 464 in the axial direction to the other surface.
  • the number of overhanging portions 464B is the same as the number of protruding portions 462B.
  • the length (overhang amount) of the overhanging portion 464B in the radial direction of the stator 460 is sufficiently shorter than the extending length of the protruding portion 462B.
  • the overhanging portion 464B is arranged at an equal angle around the central axis of the second cylindrical portion 464A, and has a second fitting portion 464C which is a concave fitting portion at the tip thereof.
  • the second fitting portion 464C includes a groove portion (mortise groove portion) 464E formed on the tip surface 464D of the overhanging portion 464B.
  • the width of the groove portion 464E (the length of the second cylindrical portion 464A in the circumferential direction) is shorter than the width of the tip surface 464D of the overhanging portion 464B (the length of the second cylindrical portion 464A in the circumferential direction).
  • the second fitting portion 464C has a concave shape due to the tip surface 464D of the overhanging portion 464B and the groove portion 464E. Further, the second fitting portion 464C has a concave cross-sectional shape and extends from one surface to the other surface in the axial direction of the outer core 464.
  • the groove portion 464E has a width slightly smaller than the width of the tenon portion 462E so that the first fitting portion 462C is press-fitted. Therefore, in the inner core 462 and the outer core 464, the first fitting portion 462C provided at the tip of the projecting portion 462B is press-fitted into the second fitting portion 464C provided at the tip of the overhanging portion 464B. As a result, the relative displacement in the circumferential direction is suppressed and the unit can be firmly integrated. Further, the relative displacement in the radial direction can be suppressed by this press-fitting.
  • the width of the tip surface 462D of the protruding portion 462B of the inner core 462 (the length in the circumferential direction of the stator 460) and the width of the tip surface 464D of the overhanging portion 464B of the outer core 464 (of the stator 460). Length in the circumferential direction) is equal. Therefore, the side surface 462F of the projecting portion 462B can be smoothly (facially) connected to the side surface 464F of the overhanging portion 464B. In the present embodiment, the side surface 462F of the projecting portion 462B is a plane substantially orthogonal to the circumferential direction of the stator 460.
  • the side surfaces 462F and 462F on both sides of the stator 460 in the circumferential direction of the projecting portion 462B are smoothly (equally flush with) the side surfaces 464F and 464F on both sides of the stator 460 in the circumferential direction in the overhanging portion 464B. ) Can be connected.
  • the side surface 464F of the overhanging portion 464B of the outer core 464 is curved in an arc shape in the cross section of the stator 460 and smoothly (parallel) continuously to the inner peripheral surface of the second cylindrical portion 464A.
  • the curved portion of the side surface 464F of the overhanging portion 464B of the outer core 464 (that is, the curved portion of the side surface 464F of the overhanging portion 464B) has an R shape.
  • This curved portion can be part or all of the side surface 464F.
  • the radius r of the R shape of the curved portion preferably satisfies the following equation (1).
  • t indicates the thickness of one steel plate (for example, an electromagnetic steel plate) constituting the outer core 464
  • W indicates the width of the protruding portion 462B of the inner core 462. (See FIG. 6).
  • the radius r of the curved portion of the curved portion of the side surface 464F of the overhanging portion 464B of the outer core 464 is equal to or more than the thickness t of one steel plate constituting the outer core 464, and the inner core 462 is projected. It is preferably not more than half the width W of the portion 462B.
  • the radius r of the curved portion of the curved portion of the side surface 464F of the overhanging portion 464B of the outer core 464 is preferably in the range of 0.5 mm to 2.5 mm.
  • the overhanging portion 464B of the outer core 464 is formed to be wider in the cross section of the stator 460 toward the base end side (in other words, toward the outer side in the radial direction of the outer core 464).
  • FIG. 7 is a partially enlarged view showing an example of the conventional stator 460'.
  • FIG. 8 is a diagram showing the efficiency of the conventional motor and the efficiency of the motor 400 in the present embodiment.
  • FIG. 9 is a diagram showing the vibration acceleration during operation of the conventional motor and the vibration acceleration during operation of the motor 400 in the present embodiment.
  • FIG. 7 corresponds to FIG.
  • the vibration acceleration shown in FIG. 9 can be measured by a vibration sensor attached to the housing of the motor.
  • FIG. 9 shows the overall value up to 20 kHz as a result of measuring by attaching the vibration sensor to the housing of the motor.
  • the efficiency of the motor was calculated by the following formula (2) by measuring the power consumption, output torque, and rotation speed of the motor.
  • the conventional stator 460'does not have the first fitting portion 462C including the tenon portion 462E in the present embodiment, and the groove portion 464G is formed in place of the second fitting portion 464C including the groove portion 464E.
  • the groove portion 464G is formed from one surface of the outer core 464 in the axial direction to the other surface, and the tip of the protruding portion 462B of the inner core 462 is press-fitted into the groove portion 464G.
  • the corner portion C formed by the side surface 462F of the projecting portion 462B of the inner core 462 and the inner peripheral surface of the second cylindrical portion 464A of the outer core 464 is substantially at a right angle (so-called pin angle). Become.
  • the substantially right-angled corner C prevents the magnetic flux from flowing smoothly.
  • the side surface 464F of the overhanging portion 464B of the outer core 464 is smoothly continuous with the inner peripheral surface of the second cylindrical portion 464A while being curved in an arc shape. Therefore, the magnetic flux can flow smoothly between the overhanging portion 464B and the second cylindrical portion 464A.
  • the motor 400 in the present embodiment can improve efficiency and suppress vibration during operation as compared with the conventional motor (see FIGS. 8 and 9).
  • inventions 1 and 2 are conventional motors including the same configuration as the conventional stator 460', and “conventional example 1” has 8 poles and 12 slots.
  • the "conventional example 2" is a 6-pole, 9-slot motor.
  • Example 1 and “Example 2” are motors 400 of the present embodiment, and “Example 1” is a motor having 8 poles and 12 slots, and “Example 2". Is a 6-pole 9-slot motor.
  • the efficiency of the 8-pole 12-slot motor was 83.2% in "Conventional Example 1" and 84.7% in “Example 1". Therefore, the efficiency was improved by 1.5 points.
  • the efficiency of the 6-pole 9-slot motor was 85.5% in “Conventional Example 2” and 87.5% in “Example 2". Therefore, the efficiency was improved by 2.0 points.
  • the motor 400 mounted on the scroll type compressor 100 which is an example of the electric compressor, includes a drive shaft 420 that transmits a rotational driving force and a rotor 440 that rotates integrally with the drive shaft 420. , And a stator 460 arranged on the outer periphery of the rotor 440.
  • the stator 460 includes an inner core 462 and an outer core 464 fitted to the inner core 462.
  • the inner core 462 includes a cylindrical first cylindrical portion 462A and a plurality of projecting portions 462B extending radially outward from the outer peripheral surface of the first cylindrical portion 462A.
  • the outer core 464 includes a cylindrical second cylindrical portion 464A and a plurality of overhanging portions 464B protruding inward in the radial direction from the inner peripheral surface of the second cylindrical portion 464A.
  • the projecting portion 462B has a first fitting portion 462C at its tip.
  • the overhanging portion 464B has a second fitting portion 464C at its tip.
  • the first fitting portion 462C fits into the second fitting portion 464C.
  • the side surface 464F of the overhanging portion 464B is curved and smoothly continuous with the inner peripheral surface of the second cylindrical portion 464A. As a result, the magnetic flux can flow smoothly between the overhanging portion 464B and the second cylindrical portion 464A, so that the efficiency of the motor 400 can be improved.
  • the curved portion of the side surface 464F of the overhanging portion 464B has an R shape.
  • the magnetic flux can smoothly flow between the overhanging portion 464B and the second cylindrical portion 464A with a simple configuration.
  • the outer core 464 is composed of a plurality of laminated steel plates.
  • the radius r of the curved portion of the curved portion of the side surface 464F of the overhanging portion 464B is equal to or larger than the thickness t of one of the steel plates.
  • the radius r of the curved portion of the curved portion of the side surface 464F of the overhanging portion 464B is less than half the width W of the protruding portion 462B in the cross section of the stator 460. As a result, a sufficient space for installing the winding can be secured.
  • the side surface 462F of the projecting portion 462B and the side surface 464F of the overhanging portion 464B are smoothly continuous. Therefore, the connection portion between the inner core 462 and the outer core 464 can be configured to be slim, so that a sufficient space for installing the winding can be secured.
  • the first fitting portion 462C is a convex fitting portion
  • the second fitting portion 464C is a concave fitting portion
  • the first fitting portion 462C may be a concave fitting portion
  • the second fitting portion 464C may be a convex fitting portion. That is, the first fitting portion 462C and the second fitting portion 464C can have any shape that can be fitted to each other.
  • the electric compressor is not limited to the scroll type compressor 100, for example, a centrifugal compressor, an axial flow compressor, a reciprocal compressor, a swash plate compressor, a diaphragm compressor, a screw compressor, a rotary compressor, and a rotary. It may be a piston type compressor, a slide vane type compressor, or the like. Further, the back pressure control valve 860 may adjust the back pressure Pm of the back pressure chamber H4 to the target pressure by increasing or decreasing the flow rate of the lubricating oil supplied to the back pressure chamber H4.
  • 100 ... Scroll type compressor (electric compressor), 400 ... Motor, 420 ... Drive shaft, 440 ... Rotor, 460, 460' ... Stator, 462 ... Inner core, 462A ... First cylindrical part, 462B ... Protruding part, 462C ... 1st fitting part, 462D ... Tip surface, 462E ... Groove part, 462F ... Side surface, 464 ... Outer core, 464A ... Second cylindrical part, 464B ... Overhanging part, 464C ... Second fitting part, 464D ... Tip surface, 464E ... groove, 464F ... side, 464G ... groove, 466 ... bobbin, r ... radius, W ... width

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

Le problème à résoudre par la présente invention est d'améliorer le rendement d'un moteur comprenant un stator ayant une structure divisée en deux moitiés. La solution selon la présente invention porte sur un moteur 400 qui est pourvu d'un stator 460 disposé dans la circonférence externe d'un rotor 440 tournant d'un seul tenant avec un arbre primaire 420. Le stator 460 est pourvu d'un noyau interne 462 et d'un noyau externe 464. Le noyau interne 462 est pourvu d'une première partie cylindrique 462A et d'une pluralité de parties en saillie 462B s'étendant vers l'extérieur dans la direction radiale à partir de la surface circonférentielle externe de la première partie cylindrique 462A. Le noyau externe 464 est pourvu d'une seconde partie cylindrique 464A et d'une pluralité de parties en surplomb 464B faisant surplomb vers l'intérieur dans la direction radiale à partir de la surface circonférentielle interne de la seconde partie cylindrique 464A. Les parties en saillie 462B ont des premières parties d'ajustement 462C au niveau de leurs pointes. Les parties en surplomb 464B ont des secondes parties d'ajustement 464C au niveau de leurs pointes. Les premières parties d'ajustement 462C s'ajustent dans les secondes parties d'ajustement 464C. La surface latérale 464F des parties en surplomb 464B s'incurve et s'étend sans à-coups jusqu'à la surface circonférentielle interne de la seconde partie cylindrique 464A.
PCT/JP2021/006362 2020-02-25 2021-02-19 Moteur et compresseur électrique WO2021172205A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-029031 2020-02-25
JP2020029031A JP2021136716A (ja) 2020-02-25 2020-02-25 モータ、及び、電動圧縮機

Publications (1)

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WO2021172205A1 true WO2021172205A1 (fr) 2021-09-02

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Country Status (2)

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JP (1) JP2021136716A (fr)
WO (1) WO2021172205A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH027839A (ja) * 1988-06-27 1990-01-11 Mitsubishi Electric Corp 電動機の固定子鉄心
JP2004242414A (ja) * 2003-02-05 2004-08-26 Toyota Motor Corp 同期機ステータの製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH027839A (ja) * 1988-06-27 1990-01-11 Mitsubishi Electric Corp 電動機の固定子鉄心
JP2004242414A (ja) * 2003-02-05 2004-08-26 Toyota Motor Corp 同期機ステータの製造方法

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