WO2014068753A1 - 永久磁石埋込型電動機、圧縮機、および冷凍空調装置 - Google Patents
永久磁石埋込型電動機、圧縮機、および冷凍空調装置 Download PDFInfo
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- WO2014068753A1 WO2014068753A1 PCT/JP2012/078350 JP2012078350W WO2014068753A1 WO 2014068753 A1 WO2014068753 A1 WO 2014068753A1 JP 2012078350 W JP2012078350 W JP 2012078350W WO 2014068753 A1 WO2014068753 A1 WO 2014068753A1
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- electromagnetic steel
- permanent magnet
- magnet
- electric motor
- rotor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/02—Compressor arrangements of motor-compressor units
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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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
Definitions
- the present invention relates to a permanent magnet embedded electric motor, a compressor, and a refrigeration air conditioner.
- Nd—Fe—B rare earth magnets have a high residual magnetic flux density and are suitable for miniaturization and high efficiency of electric motors, but the coercive force decreases as the temperature increases. Therefore, when a plurality of electric motors manufactured using this rare earth magnet are operated at the same current, the electric motor used in a high temperature atmosphere is more easily demagnetized.
- a heavy rare earth element such as Dy (dysprosium) or Tb (terbium) is added to a rare earth magnet used in a high temperature atmosphere.
- permanent magnet insertion holes are formed in a rotor core on which a plurality of electromagnetic steel plates are laminated, and magnetic flux leakage prevention is provided on both sides in the circumferential direction of the permanent magnet insertion holes.
- the magnetic flux leakage means that, for example, the magnetic flux at the circumferential end of the permanent magnet leaks to the adjacent permanent magnet via the electromagnetic steel plate between the magnetic poles or is short-circuited within the self magnet.
- this rotor is configured by combining the electrical steel sheet having the above-described protrusion and the electrical steel sheet not having this protrusion.
- the magnetic steel sheet having protrusions has a shorter distance between the front and back of the magnet than the magnetic steel sheet without protrusions, and the magnetic flux is easily short-circuited within the self-magnet. With this configuration, it is possible to position the permanent magnet inserted into the permanent magnet insertion hole, and it is possible to obtain a highly efficient electric motor with less leakage of magnetic flux by reducing the area of the electromagnetic steel sheet having protrusions. .
- the permanent magnet motor for example, when the load is large, when it is locked during operation due to overload, when it is in a transient state such as at startup, or when the stator winding is short-circuited A large armature reaction may occur, and a reverse magnetic field may be applied to the rotor.
- the adjacent teeth instantaneously have different polarities, the inductance increases, and a reverse magnetic field is easily applied to the rotor.
- the reverse magnetic field is a magnetic field of a pole that is opposite to the direction of the magnetic pole of the rotor that is generated by energizing the stator.
- the present invention has been made in view of the above, and can suppress the demagnetization of the permanent magnet embedded in the rotor to further improve the reliability. And a refrigeration air conditioner.
- the present invention is a permanent magnet embedded electric motor in which a rotor core formed by laminating a plurality of electromagnetic steel plates is arranged in a stator core,
- the rotor core includes a plurality of first electromagnetic steel plates and a plurality of second electromagnetic steel plates stacked in the axial direction, and the first electromagnetic steel plate constitutes a magnetic pole of the rotor core.
- a plurality of magnet insertion holes for inserting magnets and first gaps formed at both ends in the circumferential direction of the magnet insertion holes are formed.
- the second electromagnetic steel sheet includes the magnet insertion holes and the magnets.
- the demagnetizing magnetic flux generated in the stator core is applied to the second electromagnetic steel sheet. Since it is difficult to flow, there is an effect that the demagnetization of the permanent magnet embedded in the rotor can be suppressed to further improve the reliability.
- FIG. 1 is a cross-sectional view of a permanent magnet embedded electric motor according to an embodiment of the present invention.
- FIG. 2 is a perspective view of the rotor shown in FIG.
- FIG. 3 is a perspective view of the rotor core.
- FIG. 4 is a cross-sectional view of the rotor in plan view of the second electromagnetic steel sheet.
- FIG. 5 is a cross-sectional view of the rotor core in plan view of the second electromagnetic steel sheet.
- FIG. 6 is a cross-sectional view of the rotor in plan view of the first electromagnetic steel sheet.
- FIG. 7 is a cross-sectional view of the rotor core in plan view of the first electromagnetic steel sheet.
- FIG. 8 is a cross-sectional view of a main part of the rotor.
- FIG. 9 is a side view of the electric motor for explaining the flow of magnetic flux.
- FIG. 10 is a diagram showing the correlation between the overhang length of the second electromagnetic steel sheet with respect to the stator core and the demagnetization resistance.
- FIG. 11 is a diagram showing the demagnetization resistance of a conventional electric motor and the demagnetization resistance of the electric motor according to the embodiment of the present invention.
- FIG. 1 is a cross-sectional view of an embedded permanent magnet electric motor (hereinafter “electric motor”) 100 according to an embodiment of the present invention.
- FIG. 2 is a perspective view of the rotor 30 shown in FIG.
- FIG. 3 is a perspective view of the rotor core 34.
- FIG. 4 is a cross-sectional view of the rotor 30 in plan view of the second electromagnetic steel plate 34b.
- FIG. 5 is a cross-sectional view of the rotor core 34 in plan view of the second electromagnetic steel plate 34b.
- FIG. 6 is a cross-sectional view of the rotor 30 in plan view of the first electromagnetic steel plate 34a.
- FIG. 7 is a cross-sectional view of the rotor core 34 in plan view of the first electromagnetic steel plate 34a.
- FIG. 8 is a cross-sectional view of the main part of the rotor 30.
- FIG. 9 is a side view of the electric motor 100 for explaining the flow of magnetic flux.
- FIG. 10 is a diagram showing a correlation between the overhang length of the second electromagnetic steel plate 34b with respect to the stator core 10 and the demagnetization resistance.
- FIG. 11 is a diagram showing the demagnetization resistance of a conventional electric motor and the demagnetization resistance of the electric motor 100 according to the embodiment of the present invention.
- the electric motor 100 includes a stator core 10 and a rotor 30.
- the stator core 10 is formed by stacking a plurality of electromagnetic steel sheets having a thickness of about 0.35 mm punched with a mold in the axial direction.
- the stator core 10 includes a yoke portion 11 and a plurality of teeth portions 12 extending inward from the yoke portion 11 and provided at equal intervals in the circumferential direction.
- a winding 51 (see FIG. 9) is wound around the tooth portion 12.
- a rotating magnetic field is generated by energizing the stator core 10 with a current having a frequency synchronized with the command rotational speed, and the rotor 30 is rotated by the rotating magnetic field.
- a rotor 30 is disposed on the inner peripheral side of the stator core 10 via an air gap 20.
- the permanent magnet 40 is, for example, a Nd—Fe—B rare earth magnet formed in a flat plate shape with a thickness of about 2 mm.
- the type of permanent magnet 40 is not limited to this.
- the rotor core 34 includes a plurality of first electromagnetic steel plates 34a (first electromagnetic steel plate group) stacked in the axial direction and a plurality of second electromagnetic steel plates stacked in the axial direction at both ends of the first electromagnetic steel plate group. It is comprised with the electromagnetic steel plate 34b (2nd electromagnetic steel plate group).
- the second electromagnetic steel plate 34b and the first electromagnetic steel plate 34a are manufactured, for example, by punching out an electromagnetic steel plate having a thickness of about 0.35 mm with a die.
- An insertion hole (shaft hole 32) of a shaft 50 (see FIG. 9) for transmitting rotational energy is provided at the center of the rotor core 34.
- the shaft hole 32 and the shaft 50 are connected by shrink fitting, press fitting, or the like.
- the rotor core 34 is provided with magnet insertion holes 36 formed in the number of poles in the circumferential direction at equal intervals on the same circumference.
- the magnet insertion hole 36 has substantially the same shape as the permanent magnet 40.
- the magnet insertion hole 36 is provided in the vicinity of the rotor outer peripheral surface 38 between the rotor outer peripheral surface 38 and the shaft hole 32. Adjacent permanent magnets 40 are inserted into the magnet insertion holes 36 so as to have opposite polarities in the radial direction. This constitutes each magnetic pole.
- the number of magnetic poles of the rotor 30 may be two or more, and in this embodiment, a configuration example of the rotor 30 having six magnetic poles will be described as an example.
- a plurality of slits 37 are provided in the iron core portion between the radially outer surface 36 a of the magnet insertion hole 36 and the rotor outer peripheral surface 38.
- the slit 37 is for suppressing the armature reaction magnetic flux from the stator core 10 to reduce sound vibration.
- the rotor core 34 is provided with a plurality of air holes 31 that are air gaps that are refrigerant flow paths between the magnet insertion hole 36 and the shaft hole 32.
- the rotor core 34 is provided close to the inner diameter side surface 36 b of the magnet insertion hole 36.
- the second electromagnetic steel plate 34b and the first electromagnetic steel plate 34a are formed such that the slits 37 and the air holes 31 have the same shape.
- FIG. 4 shows a second electromagnetic steel plate 34 b in which the permanent magnet 40 is inserted into the magnet insertion hole 36
- FIG. 5 shows a second electromagnetic steel sheet in which the permanent magnet 40 is not inserted into the magnet insertion hole 36
- a steel plate 34b is shown.
- the second electromagnetic steel plate 34b is formed with a magnet insertion hole 36, a second flux barrier 33b, which is a gap for preventing a magnetic flux short circuit, and a projection 35 for fixing the magnet.
- the protrusions 35 are formed at both ends in the circumferential direction of the radially inner side surface 36b of the magnet insertion hole 36, and are provided so as to protrude radially outward from the radially inner side surface 36b.
- the second flux barriers 33 b are provided on both sides in the circumferential direction of the magnet insertion hole 36.
- FIG. 6 shows a first electromagnetic steel plate 34a in which the permanent magnet 40 is inserted into the magnet insertion hole 36
- FIG. 7 shows a first electromagnetic steel plate in which the permanent magnet 40 is not inserted into the magnet insertion hole 36.
- a steel plate 34a is shown.
- a magnet insertion hole 36 and a first flux barrier 33a that is a gap for preventing magnetic flux short-circuiting are formed in the first electromagnetic steel plate 34a.
- the first flux barriers 33 a are provided on both sides of the magnet insertion hole 36 in the circumferential direction.
- the first electromagnetic steel plate 34 a is not provided with the projection 35 of the second electromagnetic steel plate 34 b, and the inner diameter side surface 36 b of the magnet insertion hole 36 extends linearly to the vicinity of the gap 21.
- the projection 35 is provided on the second electromagnetic steel plate 34b, but the projection 35 is not provided on the first electromagnetic steel plate 34a.
- the permanent magnet 40 is positioned at the center of the magnetic pole and is held so that the permanent magnet 40 does not move during driving. be able to.
- the protrusion 35 becomes the shortest magnetic path to the magnet insertion hole 36, and the magnet magnetic flux (the magnetic flux between the adjacent permanent magnets 40) is easily short-circuited. Therefore, it is desirable that the height of the protrusion 35 (thickness t of the protrusion 35 shown in FIG. 4) be as small as possible (for example, about 1 mm) as long as the permanent magnet 40 can be held.
- the rotor 30 is designed such that the magnetic path is narrowed by the flux barriers (33a, 33b).
- the size of the flux barrier in the radial direction is, for example, the same size as that of the electromagnetic steel sheet (about 0.35 mm).
- the axial length of the rotor core 34 is the rotor stack thickness X
- the axial length of the stator core 10 is the stator stack thickness Y
- the axial end from the axial center of the stator core 10 is shown.
- the length L1 to the portion 10a, the length L2 from the axial center of the rotor core 34 to the axial end 34a, and the difference between the rotor product thickness X and the stator product thickness Y is defined as an overhang length Z To do.
- the rotor product thickness X is a size obtained by adding the second electrical steel plate group to the first electrical steel plate group, and the rotor product thickness X is formed larger than the stator product thickness Y.
- the stator stack thickness Y is 40 mm and the rotor stack thickness X is 50 mm.
- the first electrical steel sheet group is formed so that the thickness thereof is smaller than the stator thickness Y.
- the second electrical steel sheet group provided at both ends of the first electrical steel sheet group is formed so that the thickness thereof is larger than the overhang length Z, for example. That is, a part of the second electromagnetic steel sheet group (the number of the second electromagnetic steel sheets 34 b is about several) is arranged at a position facing the stator core 10.
- the axial center of the stator core 10 and the axial center of the rotor 30 are arranged so as to substantially coincide with each other, the first electrical steel sheet group is provided at a position facing the stator core 10, and the second electrical steel sheet 34b. Is provided at a position overhanging from the axial end portion 10 a of the stator core 10. Accordingly, the overhang length Z is 10 mm, and the rotor protrudes from the stator by 5 mm at both ends in the axial direction. Note that the amount of protrusion of the rotor with respect to the stator may be asymmetric at both ends in the axial direction.
- the permanent magnet 40 inserted into the magnet insertion hole 36 has an axial length that is the same as the rotor stack thickness X.
- the rotor 30 needs to ensure the holding strength of the permanent magnet 40 against the centrifugal force of the permanent magnet 40 generated by the rotation of the rotor 30 and the vibration of the permanent magnet 40 due to the electromagnetic force applied to the permanent magnet 40. There is. Therefore, when the above holding strength is insufficient, it is necessary to increase the axial thickness of the second electromagnetic steel sheet group.
- FIG. 8 shows a cross section of a conventional electric motor.
- the second electromagnetic steel plate 34b1 in which the second flux barrier 33b and the protrusion 35 are formed is provided at a position facing the stator core 10. That is, the protrusion 35 is formed at a position facing the stator core 10.
- the distance from the radially outer surface 40 a of the permanent magnet 40 to the protrusion 35 is narrower than the thickness of the permanent magnet 40.
- the demagnetizing magnetic flux a avoiding the second flux barrier 33b having a large magnetic resistance tends to concentrate on the protrusion 35 having a small magnetic resistance.
- a part of the permanent magnet 40 adjacent to the protrusion 35 is demagnetized, and local partial demagnetization occurs.
- the permanent magnet 40 retains the original magnetic characteristics until the reverse magnetic field reaches a certain threshold value, but when this threshold is exceeded, the residual magnetic flux density decreases and the irreversible decrease does not return to the original magnetic characteristics. It becomes magnetic.
- irreversible demagnetization occurs, the residual magnetic flux density of the permanent magnet 40 decreases, the current for generating torque increases, and not only the efficiency of the motor deteriorates, but also the controllability of the motor deteriorates, and reliability Bring about a decline.
- Such a problem can be solved by omitting the projection 35 from the magnet insertion hole 36. However, if there is no projection 35, it is difficult to arrange the permanent magnet 40 at the center of the magnetic pole.
- the permanent magnet 40 when the permanent magnet 40 is displaced in the left-right direction with respect to the magnetic pole, the magnetic flux density distribution on the rotor surface becomes asymmetric with respect to the pole, resulting in the generation of sound vibration and a reduction in efficiency. Further, when the motor is driven, electromagnetic force acts on the permanent magnet, and the permanent magnet 40 may move and break, or the permanent magnet 40 may be a source of sound vibration.
- the conventional rotor shown in the above-mentioned Patent Document 1 is configured by combining the electrical steel sheet having the projections 35 and the electrical steel sheet not having the projections 35. With this configuration, the permanent magnet can be positioned and the influence of leakage magnetic flux caused by the protrusion 35 can be reduced. However, when the axial thickness of the second electrical steel sheet group is increased in order to provide the above-described holding strength, the demagnetizing magnetic flux concentrates on the projection 35 having a small magnetic resistance, and the permanent magnet is adjacent to the projection 35. Partial demagnetization occurs in the magnet 40.
- the first electromagnetic steel sheet group that does not have the protrusion 35 and is difficult to demagnetize is provided at a position facing the stator core 10, and the protrusion
- the second electromagnetic steel plate 34 b that has 35 and is easily demagnetized is provided at a position overhanging the axial end portion 10 a of the stator core 10. Since the second electromagnetic steel sheet group is a magnet-embedded electromagnetic steel sheet group, the magnetic flux b1 of the permanent magnet 40 provided in the second electromagnetic steel sheet group passes through the iron core on the rotor outer peripheral surface 38 side. As a result, the stator core 10 is linked while being curved in the radial direction.
- this Embodiment is an example at the time of being comprised so that an effect may be acquired to the maximum, and is not limited to this structure.
- the effect can be obtained even when several second electromagnetic steel plates are arranged at positions facing the stator core 10 within a range where the influence of demagnetization is small.
- the 2nd electromagnetic steel plate group is arrange
- the same effect can be obtained even when the second electromagnetic steel sheet group is arranged only on one of the axial ends of the first electromagnetic steel sheet group.
- the demagnetizing magnetic flux a generated in the stator core 10 tends to pass through the portion having the smallest magnetic resistance, and therefore it is difficult to flow to the second electrical steel sheet group having a large magnetic resistance.
- the demagnetization resistance can be improved.
- the insertability of the permanent magnet 40 is also excellent. .
- the rotor 30 In the rotor 30 according to the present embodiment, after the permanent magnet 40 is positioned by the projection 35, for example, a tapered rod is inserted into the air hole 31, and this rod is inserted in the direction of the arrow shown in FIG.
- the thin portion 31a interposed between the radially inner side surface 36b of the magnet insertion hole 36 and the air hole 31 is deformed in the radially outward direction.
- the inner diameter side surface 36 b of the magnet insertion hole 36 is pressed against the inner diameter surface of the permanent magnet 40, and the permanent magnet 40 is held in the magnet insertion hole 36. Therefore, the above holding strength can be ensured without increasing the axial thickness of the second electrical steel sheet group.
- the projections 35 of the second electromagnetic steel sheet 34b need only have a positioning function in the circumferential direction of the permanent magnet 40, and the rotor 30 relatively reduces the axial thickness of the second electromagnetic steel sheet group. Can be small.
- the ratio of the thickness of the second electrical steel sheet group at the position overhanging from the axial end portion 10 a of the stator core 10 is 0 mm.
- the demagnetization characteristic when changing from 10 mm to 10 mm is shown.
- the horizontal axis shows the ratio of the thickness of the second electrical steel sheet group, and the vertical axis shows the demagnetization resistance.
- 0 mm on the horizontal axis represents a state where all the second electromagnetic steel sheet groups are disposed at positions facing the stator core 10.
- the demagnetization resistance is defined as follows. That is, a demagnetizing current is applied at a temperature (for example, about 150 ° C.) assuming the inside of the compressor (a demagnetizing magnetic flux is applied to the permanent magnet), and an induced voltage (when the motor is rotated by external power) It is defined as the ratio of the current value at which the generated voltage is reduced by 1% (irreversibly demagnetizing).
- the demagnetization resistance is improved as the ratio of the thickness of the second electrical steel sheet group increases from 0 mm. For example, when the thickness is 10 mm, the demagnetization resistance is improved by 5%.
- the conventional electric motor has protrusions 35 formed on all the electromagnetic steel plates constituting the rotor core.
- the permanent magnet 40 having a coercive force lower than that of the permanent magnet used in the conventional electric motor can be used. That is, in the electric motor 100, the addition amount of heavy rare earth elements for improving the coercive force can be reduced, and the cost can be reduced.
- the breakdown of the improvement in the demagnetization resistance shown in FIG. 11 is improved by 5% by reducing the ratio of the first electrical steel sheet group provided with the protrusions 35, and the first electrical steel sheet group is replaced with the stator core 10. It is further improved by 5% by overhanging.
- the electric motor 100 according to the present embodiment has the following effects regardless of the winding method, the number of slots, and the number of poles.
- the motor 100 that is resistant to demagnetization can be obtained, a magnet having a low coercive force can be used if the demagnetization resistance is equivalent to that of a conventional motor. It is possible to use an inexpensive rare earth magnet with a small amount. Reducing the addition amount of heavy rare earth elements improves the residual magnetic flux density of the magnet, so that the magnet torque is improved, the current for generating the same torque can be reduced, and the copper loss can be reduced, And it becomes possible to reduce the conduction loss of an inverter.
- the permanent magnet 40 can be made thinner if a demagnetization resistance equivalent to that of a conventional motor is used, and an expensive rare earth magnet is used. It becomes possible to further reduce the manufacturing cost by suppressing the amount.
- the permanent magnet 40 is fixed to the magnet insertion hole 36 by deforming the thin portion 31a located in the radially outward direction of the air hole 31.
- the second electromagnetic steel sheet group needs to have a half thickness (25 mm) of 50 mm.
- the second electromagnetic steel plate 34b since the permanent magnet 40 is fixed at a portion other than the protrusion 35, the second electromagnetic steel plate 34b only needs to have a function of positioning the permanent magnet 40 in the circumferential direction.
- the thickness of the electrical steel sheet group 2 can be suppressed to about 10 mm. As a result, the area of the second electrical steel sheet group on which the protrusions 35 are formed can be reduced, and the overhang length Z can be reduced.
- the method of fixing the permanent magnet 40 is not limited to the method of deforming the air hole 31, and the permanent magnet 40 may be bonded to the inner peripheral surface of the magnet insertion hole 36, for example.
- stator stack thickness Y and the rotor stack thickness X described in the present embodiment are examples, and the second electromagnetic steel plate 34b is overhanging from the axial end portion 10a of the stator core 10. If it is formed, it is possible to obtain the same effect as described above.
- all the second electromagnetic steel plates 34b constituting the second electromagnetic steel plate group are overhanging from the axial end portion 10a of the stator core 10. Although it is desirable, the same effect can be obtained if at least one second electromagnetic steel plate 34b is overhanging from the axial end portion 10a of the stator core 10.
- the second electromagnetic steel sheet group is provided at both ends of the rotor core 34.
- the second electromagnetic steel sheet group is provided only at one end of the rotor core 34.
- the same effect can be obtained.
- the electric motor 100 using the rotor 30 performs a variable speed drive by PWM control by an inverter of a drive circuit (not shown), thereby achieving a high efficiency according to a required product load condition.
- a variable speed drive by PWM control by an inverter of a drive circuit (not shown), thereby achieving a high efficiency according to a required product load condition.
- it when it is mounted on a compressor of an air conditioner, it can be used in a high temperature atmosphere of 100 ° C. or higher.
- the electric motor 100 includes the rotor core 34 including the plurality of first electromagnetic steel plates 34a and the plurality of second electromagnetic steel plates 34b that are stacked in the axial direction.
- the first electromagnetic steel plate 34a has a plurality of magnet insertion holes 36 into which the magnets (40) constituting the magnetic poles of the rotor core 34 are inserted, and first magnets formed at both ends in the circumferential direction of the magnet insertion holes 36.
- a gap (33a) is formed
- the second electromagnetic steel plate 34b has a plurality of magnet insertion holes 36, second gaps (33b) formed at both ends in the circumferential direction of the magnet insertion holes 36, and the magnets.
- Protrusions 35 are formed at both ends in the circumferential direction of the radially inner side surface 36b of the insertion hole 36 to restrict the position of the magnet
- the second electromagnetic steel plate 34b is an electromagnetic steel plate group composed of a plurality of first electromagnetic steel plates 34a. Stacked on at least one of the axial ends 10a. And is provided at a position overhanging from the axial end 10a of the stator core 10.
- the permanent magnet embedded electric motor, the compressor, and the refrigerating and air-conditioning apparatus show an example of the contents of the present invention, and can be combined with another known technique. However, it is needless to say that modifications can be made such as omitting a part without departing from the gist of the present invention.
- the present invention can be applied to a permanent magnet embedded electric motor, and is particularly useful as an invention capable of further reducing the manufacturing cost while improving the efficiency of the electric motor.
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Abstract
Description
図1は、本発明の実施の形態に係る永久磁石埋込型電動機(以下「電動機」)100の断面図である。図2は、図1に示される回転子30の斜視図である。図3は、回転子コア34の斜視図である。図4は、第2の電磁鋼板34bを平面視した回転子30の断面図である。図5は、第2の電磁鋼板34bを平面視した回転子コア34の断面図である。図6は、第1の電磁鋼板34aを平面視した回転子30の断面図である。図7は、第1の電磁鋼板34aを平面視した回転子コア34の断面図である。図8は、回転子30の要部断面図である。図9は、磁束の流れを説明するための電動機100の側面図である。図10は、固定子コア10に対する第2の電磁鋼板34bのオーバーハング長と減磁耐力との相関関係を示す図である。図11は、従来の電動機の減磁耐力と本発明の実施の形態に係る電動機100の減磁耐力とを示す図である。
Claims (5)
- 複数の電磁鋼板を積層してなる回転子コアを固定子コア内に配置して成る永久磁石埋込型電動機であって、
前記回転子コアは、
軸方向に積層された複数の第1の電磁鋼板と、複数の第2の電磁鋼板とから成り、
前記第1の電磁鋼板には、前記回転子コアの磁極を構成する磁石を挿入する複数の磁石挿入孔と、この磁石挿入孔の周方向両端に形成される第1の空隙とが形成され、
前記第2の電磁鋼板には、前記各磁石挿入孔と、この磁石挿入孔の周方向両端に形成される第2の空隙と、この磁石挿入孔の径内側面の周方向両端に形成され前記磁石の位置を規制する突起とが形成され、
前記第2の電磁鋼板は、前記複数の第1の電磁鋼板から成る電磁鋼板群の軸方向端部の少なくとも一方に積層され、かつ、前記固定子コアの軸方向端部よりオーバーハングした位置に設けられていることを特徴とする永久磁石埋込型電動機。 - 前記第1の電磁鋼板および前記第2の電磁鋼板には、前記磁石挿入孔と回転子軸との間に位置する空隙が形成され、
前記突起で位置が規制された前記磁石は、前記磁石挿入孔の径内側面とこの空隙との間に介在する薄肉部が径外方向に変形することにより、前記磁石挿入孔の内周面に保持されることを特徴とする請求項1に記載の永久磁石埋込型電動機。 - 前記突起で位置が規制された前記磁石は、前記磁石挿入孔の内周面に接着されることを特徴とする請求項1に記載の永久磁石埋込型電動機。
- 請求項1から請求項3に記載の永久磁石埋込型電動機を搭載した圧縮機。
- 請求項4に記載の圧縮機を搭載したことを特徴とする冷凍空調装置。
Priority Applications (6)
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JP2014544166A JP5933743B2 (ja) | 2012-11-01 | 2012-11-01 | 永久磁石埋込型電動機、圧縮機、および冷凍空調装置 |
PCT/JP2012/078350 WO2014068753A1 (ja) | 2012-11-01 | 2012-11-01 | 永久磁石埋込型電動機、圧縮機、および冷凍空調装置 |
EP12887742.0A EP2916434B1 (en) | 2012-11-01 | 2012-11-01 | Electric motor with embedded permanent magnet, compressor, and refrigeration and air conditioning equipment |
US14/434,828 US9800105B2 (en) | 2012-11-01 | 2012-11-01 | Permanent magnet embedded motor, compressor, and refrigeration and air conditioning device |
CN201280076722.4A CN104756366B (zh) | 2012-11-01 | 2012-11-01 | 永久磁铁嵌入型电动机、压缩机以及制冷空调装置 |
CN201320685864.2U CN203747605U (zh) | 2012-11-01 | 2013-11-01 | 永久磁铁嵌入型电动机、压缩机以及制冷空调装置 |
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PCT/JP2012/078350 WO2014068753A1 (ja) | 2012-11-01 | 2012-11-01 | 永久磁石埋込型電動機、圧縮機、および冷凍空調装置 |
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US (1) | US9800105B2 (ja) |
EP (1) | EP2916434B1 (ja) |
JP (1) | JP5933743B2 (ja) |
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JP2016001933A (ja) * | 2014-06-11 | 2016-01-07 | 日産自動車株式会社 | 回転電機のロータ構造 |
WO2017163383A1 (ja) * | 2016-03-24 | 2017-09-28 | 三菱電機株式会社 | 永久磁石電動機、圧縮機、および空気調和機 |
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JPWO2018198217A1 (ja) * | 2017-04-26 | 2019-11-07 | 三菱電機株式会社 | 永久磁石型モータ |
US11404925B2 (en) | 2017-04-26 | 2022-08-02 | Mitsubishi Electric Corporation | Permanent magnet motor |
KR20220129695A (ko) * | 2021-03-16 | 2022-09-26 | 한국전자기술연구원 | 오버행 자로 단축 구조를 갖는 회전자 및 그를 포함하는 영구자석 전동기 |
KR102574791B1 (ko) | 2021-03-16 | 2023-09-07 | 한국전자기술연구원 | 오버행 자로 단축 구조를 갖는 회전자 및 그를 포함하는 영구자석 전동기 |
JP7510730B2 (ja) | 2021-10-15 | 2024-07-04 | 杭州宇▲樹▼科技有限公司 | 3dレーザーレーダーおよび脚式ロボット |
Also Published As
Publication number | Publication date |
---|---|
CN104756366B (zh) | 2017-11-28 |
US9800105B2 (en) | 2017-10-24 |
CN203747605U (zh) | 2014-07-30 |
JPWO2014068753A1 (ja) | 2016-09-08 |
JP5933743B2 (ja) | 2016-06-15 |
EP2916434B1 (en) | 2017-07-19 |
EP2916434A1 (en) | 2015-09-09 |
US20150280500A1 (en) | 2015-10-01 |
CN104756366A (zh) | 2015-07-01 |
EP2916434A4 (en) | 2016-06-29 |
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