WO2017105147A1 - 영구자석 매립형 전동기를 위한 로터 및 그를 이용한 전동기 - Google Patents
영구자석 매립형 전동기를 위한 로터 및 그를 이용한 전동기 Download PDFInfo
- Publication number
- WO2017105147A1 WO2017105147A1 PCT/KR2016/014839 KR2016014839W WO2017105147A1 WO 2017105147 A1 WO2017105147 A1 WO 2017105147A1 KR 2016014839 W KR2016014839 W KR 2016014839W WO 2017105147 A1 WO2017105147 A1 WO 2017105147A1
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- WIPO (PCT)
- Prior art keywords
- rotor
- hole
- permanent magnet
- center
- embedded motor
- Prior art date
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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
- 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
- H02K1/16—Stator cores with slots for windings
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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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- 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
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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]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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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
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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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
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
Definitions
- the present invention relates to a rotor for a permanent magnet embedded motor and an electric motor using the same. More particularly, the present invention relates to a rotor having a permanent magnet embedded in the rotor and a motor including the same.
- an electronic switching type brushless motor (BLDC motor) using a semiconductor device has been widely used.
- BLDC motor brushless motor
- the arrangement structure it may be classified into an interior rotor type and an exterior rotor type.
- a rotor in which a shaft is inserted in the center of a cylindrical permanent magnet is used, or a so-called IPM type in which a shaft is inserted in the center of a rotor core in which electrical steel is laminated and a plurality of permanent magnets are inserted in the rotor core.
- Permanent magnet rotor is used.
- the reluctance torque is a force generated by using the polarity of the d-axis inductance Ld and the q-axis inductance Lq.
- the permanent magnet is often arranged in a V shape.
- FIG. 1 An example of a rotor used in such a permanent magnet embedded motor is shown in FIG. 1.
- the rotor may be used as a driving unit of an electric compressor, and the rotor 10 is disposed inside the stator having a tooth protruding in an inward direction and a coil wound around the tooth, and the rotor 10 is provided in plurality.
- the rotor core 12 includes a rotor core 12 formed by stacking electrical steel sheets, and a plurality of pairs of permanent magnets arranged to form a substantially 'V' shape adjacent to the outer circumferential side of the rotor core 12. It is fixed in a form embedded in the inside.
- a driving shaft hole 20 for inserting and fixing a driving shaft is provided at a substantially central portion of the rotor core 12, and a plurality of permanent magnet insertion holes 30 are formed around the driving shaft hole 20. It is formed at regular intervals in the form of a V opening toward.
- the rotor core portion 12 between the drive shaft hole 20 and the permanent magnet insertion hole 30 serves as a passage through which magnetic flux can pass and at the same time serves to support the rotational force of the drive shaft.
- the driving shaft hole 20 is press-fitted in a state in which the driving shaft is in close contact
- the permanent magnet insertion hole 30 is also provided with a plurality of permanent magnets so that the permanent magnet closes the insertion hole, accordingly the rotor 10 ) Has a problem that the motor may be overheated because there is no passage for heat release.
- the present invention has been made to overcome the disadvantages of the prior art as described above, the technical problem to provide a rotor for a permanent magnet embedded motor that can reduce the cogging torque while minimizing the change of the rotor.
- Another object of the present invention is to provide a rotor for a permanent magnet-embedded electric motor which can be reduced in weight and reduced in cost, and has improved motor cooling efficiency.
- Another object of the present invention is to provide an electric motor having a rotor as described above.
- a rotor shaft is fixed to the center, a plurality of magnet insertion holes are formed spaced apart in the circumferential direction; And a plurality of pairs of permanent magnets each inserted in a V-shape to be spaced apart from each other toward the outer side in the radial direction for each of the plurality of magnet insertion holes, wherein each of the plurality of magnet insertion holes has a pair of inner edges facing each other. And a barrier hole for extending the inner space of each of the magnet insertion holes so as to protrude from the pair of inner sides, respectively.
- the cogging torque focuses on the fact that the permanent magnet attracts the stator to intermittently rotate the rotor, thereby forming a barrier hole that restricts the magnetic flux at the point where the permanent magnet has the greatest influence on the stator. This makes it possible to reduce the cogging torque as compared with the prior art.
- the barrier hole may have any shape, but may extend in an arc shape so as to block the magnetic flux more uniformly.
- each of the magnet insertion holes is formed to have a "V" shape
- the barrier hole may extend along the circumferential direction toward the center of the magnet insertion hole.
- an angle formed by two lines connecting both ends of the barrier hole and the center of the rotor core may be 12 ° to 14 °.
- the barrier hole may have a length of 1.1mm to 1.5mm.
- the barrier hole may have a thickness of 0.4 mm or more.
- a plurality of rivet holes penetrated in the circumferential direction between the magnet insertion hole of the rotor core and the rotary shaft hole to which the rotary shaft is fixed, and between the magnet insertion hole of the rotor core and the rotary shaft hole to which the rotary shaft is fixed. It may further include a plurality of fat hole formed through the circumferential direction.
- the plurality of fat loss holes may be formed to intersect a circle connecting the center of the plurality of rivet holes.
- Each of the plurality of rivet holes and the plurality of fat loss holes may be formed at a radially outer side from each inner end portion of the plurality of rivet holes than 15.9 mm away from the center of the rotor core.
- the plurality of rivet holes and the plurality of fat loss holes may be formed at the inner side in the radial direction than each outer end is 20.1mm away from the center of the rotor core.
- the plurality of rivet holes may have a circular shape and may be positioned such that an extension line of a symmetry axis of each of the magnet insertion holes passes through the center of each of the rivet holes.
- the plurality of fat hole may be symmetric with respect to a straight line connecting the center of the interval between the adjacent pair of the magnet insertion hole and the center of the rotation shaft hole.
- Each of the fat hole is formed as a part of the circle with the inner end and the outer end with respect to the center of the rotation shaft hole, both side ends connecting the inner end and the outer end relative to the center of the rivet hole facing each side end It can be formed as a part of the circle.
- the outer end may have a longer length than the inner end, and both side ends may have the same length.
- Both side ends of the fat hole may be formed spaced apart by more than 8mm from the center of the rivet hole facing each side end.
- the magnet insertion hole is characterized in that eight.
- the housing A stator fixed in the housing; And a rotor rotatably mounted in the stator, wherein the rotor is provided with a permanent magnet embedded motor, which is any one of the above-described rotors.
- stator may include twelve slots, and the rotor may include eight poles.
- the barrier hole by forming the barrier hole from the outermost side of the magnet, it is possible to reduce the size of the barrier hole to reduce the cogging torque by about half compared to the conventional while minimizing the influence on the rigidity or efficiency.
- the weight of the rotor can be reduced in weight and cost can be reduced.
- the plurality of rivet holes and the plurality of fat loss holes serve as a flow path through which the refrigerant can pass, thereby increasing the efficiency of motor cooling.
- FIG. 1 is a plan view illustrating a conventional general permanent magnet embedded motor rotor.
- FIG. 2 is a plan view schematically showing an embodiment of a permanent magnet embedded motor according to the present invention.
- FIG. 3 is an enlarged plan view of an end portion of the rotor in FIG. 2.
- Figure 4 is a graph measuring the cogging torque in the conventional rotor for permanent magnet embedded motor.
- FIG. 5 is a graph measuring cogging torque in the rotor shown in FIG. 3.
- FIG. 5 is a graph measuring cogging torque in the rotor shown in FIG. 3.
- FIG. 6 is a graph illustrating changes in cogging torque and torque ripple according to the length of the barrier hole in FIG. 2.
- FIG. 7 is a diagram illustrating a stress distribution when the rotor shown in FIG. 2 is operated at 15000 rpm with different temperatures.
- FIG. 8 is a plan view of the rotor separated from FIG. 2.
- FIG. 9 is an enlarged plan view of portion A of FIG. 8.
- FIG. 10 is a view showing magnetic flux density according to the position of the rotor shown in FIG. 9.
- FIG. 2 is a plan view schematically showing an embodiment of a permanent magnet embedded motor according to the present invention
- Figure 3 is a plan view showing an enlarged vicinity of the end of the rotor in Figure 2
- Figure 4 is a conventional permanent magnet embedded motor 5 is a graph measuring cogging torque in the rotor
- FIG. 5 is a graph measuring cogging torque in the rotor shown in FIG. 3
- FIG. 6 is a diagram showing changes in cogging torque and torque ripple according to the length of the barrier hole in FIG.
- FIG. 7 is a diagram illustrating stress distribution when the rotor shown in FIG. 2 is operated at 15000 rpm at different temperatures
- FIG. 8 is a plan view of the rotor separated from FIG. 2
- FIG. 9 is A of FIG. 8.
- 10 is an enlarged plan view of the portion
- FIG. 10 is a view showing magnetic flux density according to the position of the rotor shown in FIG. 9.
- an embodiment of the permanent magnet embedded motor according to the present invention includes a housing (not shown), a stator 50 fixed to the inside of the housing, and a rotor 100 rotatably supported in the stator. ).
- the stator 50 has a form in which a plurality of plate members having a ring shape penetrating therein is stacked, and may be fixed to the inside of the housing by using a press-fit method.
- the stator includes a plurality of teeth 52 formed to protrude radially inward and a coil 54 wound around the teeth.
- the rotor 100 is installed inside the stator 50.
- the rotor 100 includes a plurality of permanent magnets 110 to rotate by receiving an electromagnetic force generated as a current flows in a coil wound around the stator.
- the rotation shaft 200 is fixed to the center of the rotor 100 to rotate integrally with the rotor 100.
- the motor disclosed in the above embodiment is a so-called 8-pole 12-slot motor, but the present invention is not necessarily limited thereto.
- the rotor 100 includes a rotor core 102 formed by stacking a plurality of electrical steel sheets similarly to the stator.
- the rotor core 102 not only supports the rotating shaft 220 and the permanent magnet 110 described above, but also constitutes the overall shape of the rotor 100.
- a rotating shaft hole 200 is inserted into the rotating shaft 220, at least one of the above-described permanent magnet 110 is inserted in the outermost side.
- the permanent magnet 110 is inserted and fixed inside the permanent magnet insertion hole 103 formed to have a substantially 'V' shape so that the permanent magnet can be inserted.
- the permanent magnet insertion hole 103 forms a V-shaped spaced apart from each other toward the radially outward, that is, separated toward the side facing the stator 50, the permanent magnet insertion hole of the V-shape A pair of permanent magnets 110 are inserted into 103.
- восем ⁇ permanent magnet insertion holes 103 are arranged at regular intervals along the outer circumferential direction of the rotor core 102.
- the permanent magnet insertion hole 103 includes a pair of inner edges 104 that move away from each other toward the radially outer side.
- the pair of inner sides 104 are disposed to face each other with the rotor core 102 interposed therebetween, and may have a substantially obtuse angle and be disposed in a V shape.
- the outer fixing protrusion 105 and the inner fixing protrusion 106 are formed on the pair of outer sides facing the inner side 104.
- the inner and outer fixing protrusions 105 and 106 define a space in which the permanent magnet 110 is inserted therebetween. That is, both ends of the permanent magnet 110 are in contact with the inner and outer fixing projections 105 and 106, respectively, to prevent movement of the permanent magnet in the longitudinal direction of the permanent magnet insertion hole. Through this, the permanent magnet can be stably supported in the permanent magnet insertion hole.
- the space portion 107 having a substantially triangular cross section is formed on the side away from the inner side 104.
- the barrier hole 108 is further formed to protrude from the inner side 104 while being connected to the space 107.
- the space portion 107 and the barrier hole 108 is a space formed integrally with the permanent magnet insertion hole 103. Is named. Since the space 107 and the barrier hole 108 are formed as empty spaces as described above, the magnetic flux generated from the permanent magnets may not be formed. This minimizes the influence of the magnetic flux generated from the end of the permanent magnet on the stator described above.
- the space 107 is mainly to block the magnetic flux generated from one end of the permanent magnet, the barrier hole 108 to block the magnetic flux generated from the side adjacent to one end of the permanent magnet It is mainly to play a role.
- the cogging torque can be greatly reduced by forming the space portion 107 and the barrier hole 108 that respectively block the magnetic paths at the end portions and the side surfaces of the permanent magnets 110.
- the barrier hole 108 may be formed as a space part having an arbitrary shape protruding toward each other from the inner side 104.
- the barrier hole 108 is formed to have an arc shape extending toward each other in the circumferential direction from the outermost end of the permanent magnet insertion hole 103.
- the length L, the width d1 of the barrier hole 108 and the distance d2 from the outer end of the rotor core are not only the shape of the barrier hole 108, but also the cogging torque and torque by the barrier hole. This will affect the stiffness of the ripple and rotor core.
- the minimum value of the width d1 is set to 0.4 mm.
- the length L of the barrier hole 108 is one of the main factors affecting the rigidity of the rotor, the cogging torque and the torque ripple.
- the length of the barrier hole 108 is 1.5 mm, and the longer the length of the barrier hole, the cogging torque decreases, while the stiffness decreases and the torque ripple increases.
- FIG. 6 is a graph showing a change in the cogging torque and the torque ripple according to the change in the length (L).
- the cogging torque tends to decrease as the length L is longer.
- the longer the length (L) shows a tendency to increase.
- the cogging torque is continuously reduced in the section 1.1mm to 1.5mm, but the torque ripple is kept constant. Therefore, according to the graph, it can be seen that when the length L is 1.5 mm, the cogging torque can be greatly reduced while suppressing the increase in the torque ripple to some extent.
- the length (L) can be expressed in other forms. That is, the length L may also be expressed by the angle ⁇ of two lines connecting both ends of the barrier hole and a distance D (here, 0.98 mm) radially outward from the center of the rotor.
- the angle ⁇ is preferably in the range of 12 ° to 14 °.
- the point lies on a straight line connecting the center of the rotor and the center between two permanent magnets.
- the distance d2 between the radially outer surface of the barrier hole and the outer circumferential surface of the rotor core may be 0.4 mm.
- the magnet may not be securely fixed. In view of such a point, the distance d2 can be 0.4 mm.
- FIG. 4 is a graph showing a result of measuring cogging torque in a motor having a rotor without the barrier hole 108
- FIG. 5 is a result of measuring a cogging torque in a motor having a rotor shown in FIG.
- the vertical axis represents the magnitude of the cogging torque
- the horizontal axis represents a value corresponding to the period in which the respective cogging torques are tested. That is, the horizontal axis represents the number of test steps
- the graphs shown in FIGS. 4 and 5 divide one cycle of the power output during the test into 193 steps, and the cogging output in each step.
- the torque is displayed.
- the cogging torque of about 0.80 Nm is generated in the conventional electric motor, while the cogging torque of 0.30 Nm, which is less than half thereof, is generated in the conventional motor. That is, by forming a hole of about 1.5mm in the inner side of the existing permanent magnet insertion hole, the cogging torque can be reduced to less than half.
- the rotor of FIG. 2 was operated at a rotational speed of 1500 RPM at 25 ° C, 40 ° C, 60 ° C, 100 ° C, 140 ° C, and 180 ° C, respectively. Regardless of the temperature, it can be seen that the stress at the portion where the barrier hole is located is the greatest. However, it can also be seen that there is no significant difference from the stress in the radially outermost part without the barrier hole.
- the plurality of rivet holes 400 and the fat loss hole 500 are disposed between the permanent magnet insertion hole 103 and the rotation shaft hole 200 of the rotor core 102 along the circumferential direction. This can be formed through.
- the plurality of rivet holes 400 are formed in the circumferential direction between the permanent magnet insertion hole 103 and the rotary shaft hole 200, the same as the number of the permanent magnet insertion hole 103 It is preferred that the dogs are arranged at regular intervals.
- the rotor is formed by stacking a plurality of thin disk-shaped rotor core members, and the plurality of rivets 420 coupled through the plurality of rivet holes 400 form a single rotor of the stacked rotor core members. It serves to combine so that it can be easily assembled.
- the plurality of rivet holes 400 may be circular in shape, and may be rectangular or trapezoidal in addition to circular.
- the rivet holes 400 are positioned such that the extension line a of the axis of symmetry of each permanent magnet insertion hole 103 passes through the center of each of the rivet holes 400.
- a rivet hole should be formed in a portion where the magnetic core of the rotor core space portion is not formed between the rotation shaft hole 200 and the permanent magnet insertion hole 103.
- the plurality of rivet holes 400 has an inner end portion formed at a radially outer side than a center of the rotor core 102, that is, 15.9 mm away from the center of the rotation shaft hole 200. It is formed in the radially inner side than 20.1 mm away from the center of the rotation shaft hole 200.
- the magnetic flux density corresponds to a section having a low magnetic flux density with reference to FIG. 10 showing the magnetic flux density according to the position of the rotor.
- a section having the lowest magnetic flux density is shown around the rotation shaft hole 200, and a section having the lowest magnetic flux density is the rotor core portion between the rotation shaft hole 200 and the permanent magnet insertion hole 103. It can be seen that the magnetic flux density is high around the permanent magnet insertion hole (103).
- the supporting force for supporting the rotating shaft is weakened, so that the rotation of the rotor becomes unstable. Therefore, as the range of the inner and outer end portions of the plurality of rivet holes 400 is limited, it is preferable to form the rivet holes where the magnetic flux density is low enough to support the rotating shaft without disturbing the passage of the magnetic flux. Therefore, the loss of performance and efficiency of the rotor does not occur due to the formation of the rivet hole.
- the plurality of rivet holes 400 of the permanent magnet embedded rotor according to an embodiment of the present invention are located at a distance of 18 mm in the radial direction from the center of the rotating shaft hole 200. 400 is located, and is formed in a circular shape having a diameter of 4.15mm.
- the plurality of fat loss holes 500 are formed to penetrate in the circumferential direction between the permanent magnet insertion hole 103 and the rotary shaft hole 200, and are formed to intersect a circle connecting the centers of the plurality of rivet holes 400. do.
- the plurality of fat loss holes 500 are formed between each of the rivet holes 400, and are formed in the same number as the plurality of rivet holes 400. Therefore, it is preferable that eight fat loss holes are formed at regular intervals.
- the plurality of fat loss holes 500 are disposed to be symmetrical with respect to a straight line b connecting the center of the interval between the adjacent pair of permanent magnet insertion holes 103 and the center of the rotation shaft hole 200. desirable.
- the plurality of fat hole 500 is formed in the outer end in the radial direction than the inner end portion 15.9mm away from the center of the rotor core 102, that is, the center of the rotation shaft hole 200, the outer end is It is formed in the radially inner side than 20.1 mm away from the center of the rotation shaft hole 200.
- FIG. 10 showing the magnetic flux density according to the position of the rotor, the magnetic flux density corresponds to a low section.
- a section having the lowest magnetic flux density is shown around the rotation shaft hole 200, and a section having the lowest magnetic flux density is the rotor core portion between the rotation shaft hole 200 and the permanent magnet insertion hole 103. It can be seen that the magnetic flux density is high around the permanent magnet insertion hole (103).
- the plurality of fat hole 500 is formed around the rotating shaft hole 200 having the lowest magnetic flux density, the supporting force of the rotating shaft is weakened, and the rotation of the rotor becomes unstable. Therefore, as the range of the inner end and the outer end of the plurality of fat hole 500 is limited, the magnetic flux density is low, and it is preferable to form the fat hole in a place capable of sufficiently supporting the rotating shaft without disturbing the passage of the magnetic flux. Therefore, loss of performance and efficiency of the rotor does not occur due to the formation of the fat loss hole.
- the weight of the rotor can be reduced due to the formation of the plurality of fat loss holes 500, and each of the fat loss holes serves as a flow path through which the refrigerant can pass, thereby improving the efficiency of motor cooling.
- a plurality of fat hole 500 of the permanent magnet embedded motor rotor according to an embodiment of the present invention, each of the fat hole at a distance of 18mm in the radial direction from the center of the rotating shaft hole 200 ( The center of 500 is located, and the detailed shape will be described below.
- Each of the fat loss hole 500 is preferably a trapezoidal shape consisting of a portion of all sides of the circle. According to such a configuration, it is possible to reduce the weight by making the most of the section that does not interfere with the gyro while maintaining the rigidity of the rotor.
- the present invention is not limited thereto and may be changed to any shape, such as a circle, a rectangle, and a triangle, depending on the shape and size of the rotor.
- Each of the fat loss holes 500 has an inner end 502 and an outer end 501 formed as part of a circle based on the center of the rotation shaft hole 200, and the inner end 502 and the outer end 501. Both side end portions 503 and 504 connecting the end portions are formed as part of a circle based on the center of the rivet hole facing each side end portion.
- the outer end 501, the inner end 502, and the rotation shaft hole 200 of each of the fat hole is located on the concentric circles.
- the interval between the inner end portion 502 of each of the fat hole and the rotation shaft hole 200 can be kept constant at any part, thereby maintaining the rigidity of the rotor is constant.
- the outer end 501 has a longer length than the inner end 502, and both side ends 503 and 504 may have the same length.
- both side ends 503 and 504 of the fat hole are located at least 8 mm in the radial direction from the center of the rivet hole 400 facing each side end. This means that the rotor between each of the rivet holes 400 and the fattening hole 500 when both side ends 503 and 504 are located within 8 mm in the radial direction from the center of the rivet hole 400 facing each side end. This is because the thickness of the core portion becomes thinner, so that the magnetic flux cannot pass and the overall bearing capacity and durability become weak.
- each of the plurality of fat loss holes 500 of the permanent magnet embedded motor rotor has an inner end portion 502 having a diameter based on the center of the rotation shaft hole 200. It is formed as part of a circle of 31.85mm, the outer end 501 is formed as a part of a circle having a diameter of 40.15mm with respect to the center of the rotation shaft hole 200. Further, both side ends 503 and 504 are formed as a part of a circle having a diameter of 8 mm with respect to the center of the rivet hole facing each side end, and are spaced apart by 8 mm.
- the present invention relates to a rotor for a permanent magnet embedded motor and an electric motor using the same. More particularly, the present invention relates to a rotor having a permanent magnet embedded in the rotor and a motor including the same.
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
Claims (18)
- 중앙에 회전축이 고정되며, 복수 개의 자석 삽입홀이 원주 방향을 따라 이격되어 형성되는 로터 코어; 및상기 복수 개의 자석 삽입홀 마다, 반경 방향 외측으로 갈수록 서로 이격되게 V자 형태로 각각 삽입되는 복수 쌍의 영구자석;을 포함하고,상기 복수 개의 자석 삽입홀 각각은 서로 대향하는 한 쌍의 내측변을 포함하고,상기 각각의 자석 삽입홀의 내부 공간을 상기 한 쌍의 내측변으로부터 서로를 향하여 각각 돌출되도록 확장시키는 배리어 홀이 추가적으로 형성되는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제1항에 있어서,상기 배리어 홀은 원호 형상으로 연장되는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제2항에 있어서,상기 자석 삽입홀 각각은 "V"자 형태를 갖도록 형성되고,상기 배리어 홀은 자석 삽입홀의 중심을 향하여 원주 방향을 따라서 연장되는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제3항에 있어서,상기 배리어 홀의 양단부와 상기 로터 코어의 중심을 각각 연결한 두 개의 선이 이루는 각도가 12° 내지 14°인 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제3항에 있어서,상기 배리어 홀은 1.1mm 내지 1.5mm의 길이를 갖는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제1항에 있어서,상기 배리어 홀은 0.4mm 이상의 두께를 갖는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제1항에 있어서,상기 로터 코어의 상기 자석 삽입홀과 상기 회전축이 고정되는 회전축 홀 사이에 원주 방향을 따라 관통 형성되는 복수의 리벳홀; 및상기 로터 코어의 상기 자석 삽입홀과 상기 회전축이 고정되는 회전축 홀 사이에 원주 방향을 따라 관통 형성되는 복수의 살빼기홀;을 더 포함하는 영구자석 매입형 전동기용 로터.
- 제7항에 있어서,상기 복수의 살빼기홀은 상기 복수의 리벳홀의 중심을 이은 원과 교차되도록 형성되는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제8항에 있어서,상기 복수의 리벳홀과 상기 복수의 살빼기홀은 각 내측단부가 상기 로터 코어의 중심으로부터 15.9mm 떨어진 곳보다 반경방향의 외측에 형성되는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제9항에 있어서,상기 복수의 리벳홀과 상기 복수의 살빼기홀은 각 외측단부가 상기 로터 코어의 중심으로부터 20.1mm 떨어진 곳보다 반경방향의 내측에 형성되는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제8항에 있어서,상기 복수의 리벳홀은 원형의 형상으로, 상기 각 자석 삽입홀의 대칭축의 연장선이 상기 각 리벳홀의 중심을 지나도록 위치하는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제8항에 있어서,상기 복수의 살빼기홀은 인접한 한 쌍의 상기 자석 삽입홀 사이 간격의 중심과 상기 회전축 홀의 중심을 연결하는 직선을 기준으로 대칭인 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제12항에 있어서,상기 각 살빼기홀은 내측단부와 외측단부가 상기 회전축 홀의 중심을 기준으로 하는 원의 일부로 형성되며, 상기 내측단부와 외측단부를 연결하는 양 측단부는 각 측단부가 대향하는 상기 리벳홀의 중심을 기준으로 하는 원의 일부로 형성되는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제13항에 있어서,상기 외측단부는 상기 내측단부보다 보다 길이가 길게 형성되며, 상기 양 측단부는 길이가 동일한 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제14항에 있어서,상기 살빼기홀의 양 측단부는 각 측단부가 대향하는 상기 리벳홀의 중심으로부터 8mm이상 이격되어 형성되는 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 제1항에 있어서,상기 자석 삽입홀은 8개인 것을 특징으로 하는 영구자석 매입형 전동기용 로터.
- 하우징;상기 하우징 내에 고정되는 고정자; 및상기 고정자 내에 회전 가능하게 장착되는 로터;를 포함하고,상기 로터는 제1항 내지 제16항 중 어느 한 항에 따른 것을 특징으로 하는 영구자석 매입형 전동기.
- 제17항에 있어서,상기 고정자는 12개의 슬롯을 포함하고, 상기 로터는 8개의 극을 포함하는 것을 특징으로 하는 영구자석 매입형 전동기.
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JP2017566324A JP6507273B2 (ja) | 2015-12-18 | 2016-12-16 | 永久磁石埋込型電動機のためのロータ及びそれを用いた電動機 |
DE112016005233.2T DE112016005233T5 (de) | 2015-12-18 | 2016-12-16 | Rotor für Motor des Typs mit eingebettetem Permanentmagneten und Motor, der ihn verwendet |
US15/745,860 US10476326B2 (en) | 2015-12-18 | 2016-12-16 | Rotor for permanent magnet embedded-type motor and motor using the same |
CN201680027378.8A CN107534338B (zh) | 2015-12-18 | 2016-12-16 | 用于永磁体嵌入式电动机的转子和使用该转子的电动机 |
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KR1020150181794A KR102526938B1 (ko) | 2015-12-18 | 2015-12-18 | 영구자석 매립형 전동기를 위한 로터 및 그를 이용한 전동기 |
KR10-2015-0181794 | 2015-12-18 | ||
KR1020150185435A KR102515118B1 (ko) | 2015-12-23 | 2015-12-23 | 매립형 영구자석 전동기용 로터 |
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US11056939B2 (en) * | 2018-07-05 | 2021-07-06 | Aisin Aw Co., Ltd. | Rotor with stress relaxation magnetic flux suppression holes with flux paths width less than length of the hole |
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JP2020114129A (ja) * | 2019-01-15 | 2020-07-27 | 本田技研工業株式会社 | 回転電機のロータコア |
US11374449B2 (en) * | 2020-01-08 | 2022-06-28 | Hiwin Mikrosystem Corp. | Permanent-magnet spindle motor |
CN112865368A (zh) * | 2021-02-26 | 2021-05-28 | 合肥巨一动力系统有限公司 | 一种转子冲片结构 |
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US20180205274A1 (en) | 2018-07-19 |
JP6507273B2 (ja) | 2019-04-24 |
JP2018518935A (ja) | 2018-07-12 |
CN107534338A (zh) | 2018-01-02 |
DE112016005233T5 (de) | 2018-08-02 |
CN107534338B (zh) | 2019-06-14 |
US10476326B2 (en) | 2019-11-12 |
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