WO2018226040A1 - 모터 - Google Patents
모터 Download PDFInfo
- Publication number
- WO2018226040A1 WO2018226040A1 PCT/KR2018/006465 KR2018006465W WO2018226040A1 WO 2018226040 A1 WO2018226040 A1 WO 2018226040A1 KR 2018006465 W KR2018006465 W KR 2018006465W WO 2018226040 A1 WO2018226040 A1 WO 2018226040A1
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- WIPO (PCT)
- Prior art keywords
- circumferential surface
- permanent magnet
- pole shoe
- inner circumferential
- rotor
- Prior art date
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Classifications
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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
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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
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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
Definitions
- the present invention relates to a motor, and more particularly to a motor in which the rotor rotates outside the stator and the rotor is provided with a permanent magnet.
- a motor is a device that converts electrical energy into mechanical energy in a magnetic field in which current flows, and may be classified according to various criteria such as the type of power source, the position of the rotor and the stator, and the application of permanent magnets.
- a motor is classified into a direct current (DC) motor and an alternating current (AC) motor according to the type of power source, and the direct current motor is divided into a brush motor and a brushless motor.
- DC direct current
- AC alternating current
- the brush (motor) attached to the brush is a function that allows the current to flow at the same time as the current flows to the coil by the contact of the commutator and the brush, but not only mechanical and electrical noise occurs, but also has a disadvantage that the brush is worn.
- a brushless motor without a brush is widely used.
- Brushless DC motor is a motor that removes brush and commutator from DC motor and installs electronic commutator. It is also called non-commutator motor.
- the motor may be classified into a civil war motor and a brushless motor according to the relative positions of the rotor and the stator.
- 1 to 2 show an example of a brushless motor.
- the brushless motor illustrated in FIGS. 1 to 2 is provided at the tip of the rotor 110 having the permanent magnet 112 and the coil 121 wound on the inner circumferential surface of the rotor core 111.
- the pole shoe 122 is configured to include a stator 120 formed.
- the motor rotates
- the magnitude of the magnetoresistance that prevents the magnetic flux from flowing according to the position of the rotor 110 is different and the pulsation of the torque occurs due to the difference in the magnetoresistance.
- cogging torque the torque generated when the rotor rotates before the coil is powered
- vibration and noise are caused in a cooling fan, which is a motor driving system.
- Cogging torque is known to be proportional to the rate of change of magnetoresistance according to the change of position of the rotor.
- the tooth 122 of the related art shown in FIGS. 1 to 2 has a notch 124 formed on an opposing surface 123 facing the permanent magnet 112.
- Teeth 122 is formed by extending in the circumferential direction of the rotor core 111 so that the magnetic flux of the stator 120 to the rotor 110, the notch 124 is a rotor on the opposite surface 123 of the tooth 122
- a plurality is formed along the circumferential direction of the core 111.
- the stator 120 is generally made of an electrical sheet (electrical sheet) material.
- Electrical steel sheet refers to a plate made of steel that has a higher content of silicon than the general steel sheet and has excellent electrical and magnetic properties.
- non-oriented electrical steel sheets in which crystals inside the steel sheets face each other are widely used in general rotary machines such as general-purpose motors and small motors.
- the electrical steel sheet has a higher density than the permanent magnet material, and as the volume of the stator 120 increases, the weight of the motor itself increases, and it is necessary to introduce a design for reducing it.
- Prior art 1 discloses a configuration in which cogging torque and torque ripple are improved by arranging the permanent magnets to have a W shape.
- the present invention has been made to solve the problems of the conventional motor as described above, the object of the present invention by minimizing the rate of change of the magnetoresistance according to the position change of the rotor through the optimization of the shape design of the rotor and stator Accordingly, to provide a brushless motor that can greatly reduce the cogging torque and torque ripple of the motor.
- another object of the present invention is to provide a brushless motor capable of reducing the weight by optimizing the shape design considering the material of the rotor and the stator.
- the motor of the present invention for achieving the above object, the rotor 10 having a plurality of permanent magnets 12 disposed on the inner circumferential surface of the rotor core (11); And a stator 20 having a plurality of teeth 21 disposed along the circumferential direction of the stator core and pole shoes 22 formed at ends of the teeth 21 facing the permanent magnets 12.
- the permanent magnet 12 is gradually closer to the outer peripheral surface 23 of the center portion of the pole shoe 22, the outer peripheral surface 23 of the center portion of the pole shoe 22 After passing, the distance is gradually characterized.
- the inner circumferential surface 13 of the central portion of the permanent magnet 12 is formed in a curved shape having a predetermined curvature, and the inner circumferential surface 14 of both ends of the permanent magnet 12 is farther away from the center portion, the pole shoe It may be formed so that the distance from the outer peripheral surface of (22).
- the outer circumferential surface 24 of both ends of the pole shoe 22 may be formed such that the distance from the inner circumferential surface of the permanent magnet 12 is farther away from the central portion.
- the motor of the present invention includes a rotor 10 having a rotor core 11 and a plurality of permanent magnets 12 arranged on the inner circumferential surface of the rotor core 11 so as to be spaced apart from each other in a circumferential direction; And a plurality of teeth 21 disposed at an inner side of the rotor 10 and spaced apart from each other along the circumferential direction of the stator core, and formed at ends of the teeth 21 facing the permanent magnets 12.
- the inner circumferential surface 14 of is formed so that the distance from the outer circumferential surface of the pole shoe 22 is farther away from the central portion, or the outer circumferential surface 24 of both ends of the pole shoe 22 may be farther from the central portion. It may be formed so that the distance from the inner peripheral surface of the permanent magnet 12 is farther away.
- the inner circumferential surface 14 of both ends of the permanent magnet 12 may have a planar shape.
- the inner circumferential surface 14 of both ends of the permanent magnet 12 is constant with respect to the tangent of the inner circumferential surface 13 of the central portion of the permanent magnet 12 at the point where the center and both ends of the permanent magnet 12 meet. It may be formed at an angle ⁇ .
- the angle ⁇ of the inner circumferential surface 14 of both ends of the permanent magnet 12 and the tangent of the inner circumferential surface 13 of the central portion of the permanent magnet 12 satisfies a relationship of 9 ° ⁇ ⁇ ⁇ 20 °. It is desirable to.
- the inner circumferential surface 14 of both ends of the permanent magnet 12 may be located on the same plane.
- the inner peripheral surface of the permanent magnet 12 may be formed to be symmetrical with respect to the center line CL of the permanent magnet 12.
- the distance from the center of rotation (C) of the rotor 10 to the central end of the pole shoe 22 is referred to as D2, and the permanent magnet 12 at the center of rotation (C) of the rotor 10.
- D1 the distance from the center of rotation (C) of the rotor 10 to the central end of the pole shoe 22
- the angle between the ends of both ends of the permanent magnet 12 relative to the center of rotation (C) of the rotor 10 is ⁇ 1, between the both ends of the inner peripheral surface 13 of the central portion of the permanent magnet 12
- the angle of ⁇ 2 is ⁇ 2
- outer circumferential surface 23 of the central portion of the pole shoe 22 may be formed in a curved shape having a predetermined curvature.
- outer circumferential surface 24 of both ends of the pole shoe 22 may have a planar shape.
- the outer circumferential surface 24 of both ends of the pole shoe 22 is the angle formed by the tangent of the outer circumferential surface 23 of the central portion of the pole shoe 22 at the point where the center portion and both ends of the pole shoe 22 meet.
- ⁇ it is preferable to satisfy the relationship of 7 ° ⁇ ⁇ ⁇ 9 °.
- the inner circumferential surface 14 of both ends of the permanent magnet 12 has a planar shape, and the inner circumferential surface 14 of both end portions of the permanent magnet 12 meets the center portion and both end portions of the permanent magnet 12. Is formed at an angle with respect to the tangent of the inner peripheral surface of the central portion, the outer peripheral surface 24 of both ends of the pole shoe 22 has a planar shape, the outer peripheral surface of both ends of the pole shoe 22 (24)
- the end portion is formed to form a predetermined distance (L2) in the radial direction from the extension of the outer peripheral surface 23 of the central portion of the pole shoe 22, the inner peripheral surface 14 of both ends of the permanent magnet 12 is At the point where the center and both ends of the permanent magnet 12 meet, the angle ⁇ formed by the tangent of the inner circumferential surface 13 of the center of the permanent magnet 12 and the outer circumferential surfaces of both ends of the pole shoe 22 ( The pole shoe 22 at the point where the center and both ends of the pole shoe 22 meet each other. It is preferable that the angle (bet
- the motor of the present invention has the effect of greatly reducing the cogging torque and minimizing the noise and vibration of the motor by minimizing the change in the magnetic resistance according to the rotation of the rotor. More specifically, in the brushless motor of the present invention, first, in the shape of the inner peripheral surface of the permanent magnet, the center portion is formed in a circumferential shape, but both ends are chamfered, so that from one end of the permanent magnet to the next pole The change in the magnetoresistance during rotation is gradually reduced and then gradually increased, thereby greatly reducing the cogging torque. In addition, the brushless motor of the present invention has the shape in which the outer circumferential surface of the stator pole shoe and the both ends thereof are chamfered, thereby further increasing the effects as described above and further reducing cogging torque.
- the brushless motor of the present invention is made of an electrical steel sheet material to make the stator pole shoe relatively denser than the permanent magnet in the chamfered shape, thereby reducing the weight of the parts of the high density material more effectively, Furthermore, the effect that can ultimately greatly reduce the weight of the motor itself can also be obtained.
- FIG. 1 is a cross-sectional view showing a conventional brushless motor.
- FIG. 2 is a partially enlarged view of the brushless motor shown in FIG. 1.
- FIG. 2 is a partially enlarged view of the brushless motor shown in FIG. 1.
- FIG 3 is a cross-sectional view showing a brushless motor according to an embodiment of the present invention.
- Figure 4 is an enlarged view (partial rotor configuration) of a brushless motor according to an embodiment of the present invention.
- FIG 5 is a partially enlarged view (stator detailed configuration) of a brushless motor according to an embodiment of the present invention.
- FIG. 6 is a partially enlarged view of a brushless motor according to an embodiment of the present invention (another embodiment of the stator).
- FIG. 7 is a graph showing cogging torque according to ⁇ 2 / ⁇ 1 of a brushless motor according to an embodiment of the present invention.
- FIG. 9 is a stator and rotor form and various comparative examples of a brushless motor according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram illustrating a brushless motor according to an embodiment of the present invention. First, the basic configuration of the brushless motor will be described with reference to FIG. 3.
- the brushless motor 100 of the present invention includes a rotor core 11 and a plurality of permanent magnets 12 disposed on the inner circumferential surface of the rotor core 11 to be spaced apart from each other along the circumferential direction.
- One rotor 10 and a plurality of stator cores 21 disposed inside the rotor 10 and spaced apart from each other along the circumferential direction and the stator cores 21 facing the permanent magnets 12. It is configured to include; stator 20 having a pole shoe 22 formed at the end of the).
- the rotor 10 may be formed to be rotatable, and a plurality of permanent magnets 12 may be coupled to the cylindrical rotor core 11. At this time, the permanent magnets 12 may be spaced apart from each other along the circumferential direction on the inner peripheral surface of the rotor core (11).
- the permanent magnet 12 has an N pole and an S pole, disposed so that the N pole is located on the inner circumferential surface of one permanent magnet 12, and the S pole is located on the inner circumferential surface of the neighboring permanent magnets 12
- the plurality of permanent magnets may be arranged such that the positions of the N pole and the S pole are alternated along the circumferential direction.
- the stator 20 is a part fixed to the housing of the motor, and may be disposed in an empty part of the inner center of the rotor 10, and the permanent magnets 12 in the inner side surrounded by the permanent magnets 12. It may be arranged at regular intervals apart.
- the plurality of teeth 21 extend from the center to the outside of the stator core, and the teeth 21 may be spaced apart from each other along the circumferential direction of the stator core.
- the pole shoes 22 are formed at the outer ends of the teeth 21, respectively, and the pole shoes 22 are formed so that both ends of the circumferential direction protrude from the teeth 21, as shown in the teeth 21. )
- pole shoe 22 may be formed in the shape of a "T".
- pole shoes 22 formed to face each other and the teeth 21 may be formed spaced apart from each other at regular intervals.
- the coils 25 may be wound around the teeth 21, and the coils 25 to be wound may be disposed between the outer circumferential surface of the stator core and the pole shoe 22.
- the rotor 10 is provided with eight permanent magnets 12, and the stator 20 is provided with twelve teeth 21. This is merely an example, and 10 permanent magnets and 12 teeth may be formed, and the number may be changed as necessary.
- Equation 1 in the state in which the magnetic flux ⁇ does not change, when the change in magnetic resistance dR with respect to the change in the rotation angle d ⁇ of the rotor is reduced, it can be seen that the cogging torque is reduced.
- the present invention by improving the shape of the rotor 10 and the stator 20, more specifically, the shape of the permanent magnet 12 and the pole shoe 22, the problem of cogging torque and torque ripple as described above is improved do.
- the shape improvement design of the permanent magnet 12 is demonstrated first, and next, the shape improvement design of the pole shoe 22 is demonstrated.
- FIG. 4 is a partially enlarged view showing a brushless motor according to an embodiment of the present invention, in detail showing the shape improvement design details of the permanent magnet 12.
- the inner peripheral surface 13 of the central portion of the permanent magnet 12 is formed in a curved shape having a predetermined curvature, the inner peripheral surface of both ends of the permanent magnet 12 14 may be formed such that the distance from the outer peripheral surface of the pole shoe 22 is farther away from the central portion.
- the magnetic resistance gradually decreases from the center of the permanent magnet 12 to both ends thereof, and the difference between the magnetic resistance at the end of the permanent magnet 12 and the magnetic resistance in the section where the permanent magnet 12 is absent is increased. Will be reduced. In other words, before the pole shoe 22 passes through the section without the permanent magnet 12, the magnetoresistance is reduced in advance at the end of the permanent magnet 12. Therefore, regardless of the shape of the pole shoe 12, it is possible to reduce the change rate of the magnetoresistance in the entire rotation section, and eventually the cogging torque is significantly reduced to reduce the vibration and noise of the motor.
- the inner circumferential surface 14 of both end portions of the permanent magnet 12 may be formed in a planar shape.
- the inner circumferential surface 14, which is a plane of both end portions of the permanent magnet 12 may be formed at a predetermined angle ⁇ with respect to the tangent of the inner circumferential surface of the central portion at the point where the central portion and the both ends of the permanent magnet meet each other. have. Through this, it is possible to gradually reduce the change in the magnetoresistance as the rotor rotates and gradually increase it again.
- the inner circumferential surface 14 of both end portions of the permanent magnet 12 is formed in a curved shape instead of a planar shape if the distance from the outer circumferential surface of the pole shoe 22 is farther away from the center portion. May be
- the angle ⁇ between the inner circumferential surfaces of both end portions of the permanent magnet 12 and the tangent of the inner circumferential surface of the central portion satisfies 9 ° ⁇ ⁇ ⁇ 20 °. If the angle ⁇ is less than 9 °, the amount of decrease in the magnetoresistance is too small, compared with the magnetoresistance in the section where the permanent magnet 12 is not present, and thus, the amount of change in the magnetoresistance is not greatly reduced. In addition, when the angle ⁇ is greater than 20 °, the difference with the magnetoresistance value in the section where there is no permanent magnet is small, but since the magnetoresistance at the center and both ends of the permanent magnet 12 is large, there is a permanent difference.
- the amount of change in magnetoresistance in the magnet 12 itself becomes too large.
- the angle ⁇ is 9 ° or more and 20 ° or less, the difference between the magnetoresistance in the section without the permanent magnet 12 is also greatly reduced, and the difference in the magnetoresistance in the center and both ends of the permanent magnet is also not large. As a result, the rate of change of the total magnetoresistance can be minimized.
- the inner circumferential surface 14 of both ends of the permanent magnet 12 may be located on the same plane.
- the inner circumferential surfaces 13 and 14 of the permanent magnet 12 may be formed to be symmetric with respect to the center line CL of the permanent magnet. As a result, the change of the magnetoresistance occurs symmetrically with respect to the center line of the permanent magnet, thereby preventing the irregular change of the magnetoresistance.
- the distance from the center of rotation (C) of the rotor 10 to the central end of the pole shoe 22 is called D2, the center of rotation (C) of the rotor 10
- D1 The distance to the inner circumferential surface 14 of both ends of the permanent magnet 12
- D3 the distance to the center of rotation C of the rotor 10 to the inner circumferential surface 13 of the central portion of the permanent magnet 12.
- the central inner circumferential surface 13 of the permanent magnet 12 is a surface having a radius of curvature of D3, and the pole shoe 22 rotates while maintaining a predetermined distance (D3-D2) from the central inner circumferential surface 13.
- the gap D3-D2 may be formed to be smaller than 1 mm.
- D1 is closer to D3
- the length of the center portion of the permanent magnet 12 is reduced and the length of both ends is increased, so that the amount of change in the magnetoresistance in both the end portions of the permanent magnet and the section without the permanent magnet is reduced, but the permanent magnet is reduced. This reduces the motor performance because of the weak magnetic force.
- D1 is formed to be smaller than D2 to form a sufficient length of the central portion of the permanent magnet 12, it is possible to maintain the performance of the motor.
- the angle between the ends of both ends of the permanent magnet 12 with respect to the rotation center C of the rotor 10 is ⁇ 1
- the inner circumferential surface of the central portion of the permanent magnet 12 is shown in FIG. 4.
- the angle between the both ends of (13) is ⁇ 2
- the length of the center of the permanent magnet is changed according to the angle ⁇ 2 between the both ends of the inner circumferential surface 13 of the central portion of the permanent magnet 12, As a result, the cogging torque of the motor varies.
- FIG. 7 is a graph showing a change in cogging torque according to ⁇ 2 / ⁇ 1. If the value of ⁇ 2 / ⁇ 1 is less than 0.6, it is difficult to maintain the performance of the motor as the length of the center portion is reduced as compared with the permanent magnet 12 as mentioned above. Therefore, FIG. 5 shows a result obtained by repeatedly testing the cogging torque according to the ⁇ 2 / ⁇ 1 value when the ⁇ 2 / ⁇ 1 value is 0.6 or more.
- the brushless motor of the present invention may have a ⁇ 2 / ⁇ 1 value of about 0.66 or about 0.85 so that the cogging torque reduction effect can be maximized while considering the driving performance of the motor.
- the ⁇ 2 / ⁇ 1 value of the brushless motor of the present invention may be determined to be about 0.85, which is more excellent in the configuration performance of the motor compared to the reduction efficiency of the cogging torque.
- the angle between the both ends of the pole shoe 22 with respect to the center of rotation (C) of the rotor 10 is ⁇ 3, it is preferable to satisfy the relationship of ⁇ 2 ⁇ 3. This is because the length of the pole shoe 22 should be at least long enough to cover all the central portions of the permanent magnet 12 to maintain the performance of the motor.
- FIG. 5 is a partially enlarged view showing a brushless motor according to an embodiment of the present invention, in particular showing the design details of the pole shoe 22 in detail.
- the center of the permanent magnet 12 is formed in a cylindrical shape, but both ends of the chamfered shape, the magnetoresistance when rotating from one pole end of the permanent magnet to the next pole Gradually decrease the change in, then increase it again.
- Equation 1 it is known that the cogging torque is reduced when the change in the magnetic resistance (dR) of the change in the rotation angle (d ⁇ ) of the rotor is reduced, due to the shape improvement of the permanent magnet 12. Theoretically, it can be confirmed that cogging torque can be certainly reduced.
- the shape improvement of the pole shoe 22 is also made from such a viewpoint.
- the outer peripheral surface 24 of both ends of the pole shoe 22 is formed so that the distance from the inner peripheral surface of the permanent magnet 12 is farther away from the center portion Can be.
- the change in the magnetoresistance gradually decreases and then gradually increases. That is, as shown in FIG. 5, since both ends of the pole shoe 22 are chamfered, a cogging torque reduction effect obtained by forming both ends of the permanent magnet 12 in the chamfered shape can be similarly obtained. .
- the pole shoe 22 has a chamfered shape at both ends thereof, the cogging torque reduction effect can be obtained even if the inner circumferential surface of the permanent magnet 12 is not chamfered, and the permanent magnet 12 Also, when both ends are chamfered, the cogging torque reduction effect can be maximized.
- the outer circumferential surface 23 of the central portion of the pole shoe 22 may be formed in a curved shape having a predetermined curvature, as shown in FIG. 5.
- the angle between both ends of the outer circumferential surface 23 of the center portion of the pole shoe 22 with respect to the rotation center C of the rotor 10 is referred to as ⁇ 4, where ⁇ 4
- the corresponding part may be formed to form a predetermined length (L1).
- both ends of the pole shoe 22 may be completely chamfered to form a center portion of the pole shoe 22 in a vertex form.
- 5 illustrates a case where the length L1 of the outer circumferential surface 23 of the center portion of the pole shoe 22 has a value greater than 0, and FIG.
- FIG. 6 shows the outer circumferential surface 23 of the center portion of the pole shoe 22.
- the case where the length L1 is 0, that is, the case where the central portion of the pole shoe 22 is formed in the form of a vertex is shown.
- the shorter the length L1 the greater the cogging torque reduction effect.
- the length L1 of the outer circumferential surface 23 of the center portion of the pole shoe 22 is formed to be smaller than 0.06 in the range where the length L1 is 0 mm ⁇ L1 ⁇ 2 mm, and then the cogging torque is started from the point where L1 is 2 mm. You can see the tendency to grow significantly. In consideration of this point, the length L1 of the outer circumferential surface 23 of the central portion of the pole shoe 22 may satisfy a relationship of 0 mm ⁇ L1 ⁇ 2 mm.
- the size of L1 may be changed accordingly, and more preferably, the specification of the outer circumferential surface 23 of the central portion of the pole shoe 22 is represented by ⁇ 4. Specifically, it is preferable that the angle ⁇ 4 between both ends of the outer circumferential surface 23 of the center portion of the pole shoe 22 satisfies a relationship of 0 ° ⁇ ⁇ 4 ⁇ 1.5 °.
- the outer circumferential surfaces 24 of both ends of the pole shoe 22 may be formed in a planar shape.
- ends of the outer circumferential surface 24 of both ends of the pole shoe 22 may be formed to form a predetermined distance L2 in a radial direction from an extension line of the outer circumferential surface 23 of the center portion of the pole shoe 22. .
- the rotor may rotate (similar to a phenomenon according to the shape of the inner circumferential surface 14 of both ends of the permanent magnet 12) to gradually reduce the change in the magnetoresistance, and then gradually increase it again.
- the outer circumferential surface 24 of both ends of the pole shoe 22 is not a planar shape if the distance from the inner circumferential surface of the permanent magnet 12 is farther away from the center portion. It may be formed in a shape.
- the size of L2 may be changed accordingly, so that it is more preferable to represent the specification of the outer circumferential surface 24 of both ends of the pole shoe 22 at an angle. desirable.
- the angle at which the outer circumferential surface 24 of both end portions of the pole shoe 22 meets the tangent of the outer circumferential surface 23 of the central portion of the pole shoe 22 at the point where the center portion and the both end portions of the pole shoe 22 meet each other is ⁇ .
- it is preferable that such an angle ⁇ satisfies a relationship of 7 ° ⁇ ⁇ ⁇ 9 °.
- the inner circumferential surface 14 of both ends of the permanent magnet 12 has a chamfered shape, or the outer circumferential surface 24 of both ends of the pole shoe 22 has a chamfered shape.
- the change in magnetoresistance gradually decreases and then gradually increases, thereby effectively reducing cogging torque.
- only the permanent magnet 12 may have a chamfering shape
- only the pole shoe 22 may have a chamfering shape
- both the permanent magnet 12 and the pole shoe 22 have a chamfering shape. You can do that.
- the permanent magnet 12 is higher than the pole shoe 22, while the pole shoe 22 (made of electrical steel) has a higher density than the permanent magnet 12. Big.
- the material, height, etc. of the permanent magnet 12 and the pole shoe 22 are summarized as follows.
- the degree of weight influence as the area is changed on the cross-section is greater in the pole shoe (made of electrical steel) than the permanent magnet.
- Figure 9 shows the stator and rotor form and various comparative examples of the brushless motor according to an embodiment of the present invention, and the weight and cogging torque for each case.
- 9A illustrates a stator and a rotor of a brushless motor according to an embodiment of the present invention, in which both the permanent magnets 12 and the pole shoe 11 have a chamfered shape at both ends thereof.
- the weight also appears as small as 0.791g
- the cogging torque is as small as 0.100Nm.
- Figure 9 (B) is a case in which only the pole shoe 11 has a chamfered shape at both ends, where the weight is 0.798g, the cogging torque is 0.227Nm.
- 9 (C) shows that only the permanent magnet 12 has a chamfered shape at both ends thereof. At this time, the weight is 0.802 g and the cogging torque is 0.179 Nm.
- the permanent magnet 12 and the pole shoe 11 may have the both ends of the chamfered shape as well as the best case. However, there may be a case where only one of the two should be chamfered. Can be.
- the weight reduction effect is relatively large when the pole shoe 11 only has both ends of the chamfered shape
- the cogging torque reduction effect is relatively small.
- the cogging torque reduction effect is relatively small while the weight reduction effect is relatively large.
- the shapes of the permanent magnet 12 and the pole shoe 11 have the following relationship.
- the inner circumferential surface 14 of both ends of the permanent magnet 12 has a planar shape, and the inner circumferential surface 14 of both end portions of the permanent magnet 12 meets the center and both ends of the permanent magnet 12. It is assumed that is formed at a predetermined angle ( ⁇ ) with respect to the tangent of the inner peripheral surface of the central portion.
- the outer circumferential surface 24 of both ends of the pole shoe 22 has a planar shape, and the end of the outer circumferential surface 24 of both ends of the pole shoe 22 has an outer circumferential surface 23 of the central portion of the pole shoe 22.
- the motor of the present invention has the effect of greatly reducing the cogging torque and minimizing the noise and vibration of the motor by minimizing the change in the magnetic resistance according to the rotation of the rotor.
- the motor of the present invention it is effective to reduce the weight of the parts made of a high density material more effectively, and ultimately to significantly reduce the weight of the motor itself.
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims (16)
- 회전자 코어(11)의 내주면에 배치된 복수의 영구자석(12)을 구비한 회전자(10); 및고정자 코어의 둘레방향을 따라 배치된 복수 개의 티스(21)와 상기 영구자석(12)과 마주하는 상기 티스(21)의 끝단에 형성된 폴 슈(22)를 구비한 고정자(20);를 포함하되,상기 회전자(10)의 회전 시, 상기 영구자석(12)은 상기 폴 슈(22) 중앙부의 외주면(23)과 거리가 점차 가까워진 후, 상기 폴 슈(22) 중앙부의 외주면(23) 통과 후 거리가 점차 멀어지는 것을 특징으로 하는 모터.
- 제1항에 있어서,상기 영구자석(12)의 중앙부의 내주면(13)은 일정 곡률을 갖는 곡면 형상으로 형성되고, 상기 영구자석(12)의 양측 단부의 내주면(14)은 상기 중앙부에서 멀어질수록 상기 폴 슈(22)의 외주면과의 거리가 멀어지도록 형성되는 것을 특징으로 하는 모터.
- 제2항에 있어서,상기 폴 슈(22)의 양측 단부의 외주면(24)은 상기 중앙부에서 멀어질수록 상기 영구자석(12)의 내주면과의 거리가 멀어지도록 형성된 것을 특징으로 하는 모터.
- 제2항에 있어서,상기 영구자석(12)의 양측 단부의 내주면(14)은 평면 형상을 갖는 것을 특징으로 하는 모터.
- 제4항에 있어서,상기 영구자석(12)의 양측 단부의 내주면(14)은 상기 영구자석(12)의 중앙부와 양측 단부가 만나는 점에서 상기 영구자석(12)의 중앙부의 내주면(13)의 접선에 대하여 일정 각도(α)를 이루며 형성되는 것을 특징으로 하는 모터.
- 제5항에 있어서,상기 영구자석(12)의 양측 단부의 내주면(14)이 상기 영구자석(12)의 중앙부의 내주면(13)의 접선과 이루는 각도(α)가 9˚ ≤ α ≤ 20˚ 의 관계를 만족하는 것을 특징으로 하는 모터.
- 제4항에 있어서,상기 영구자석(12)의 양측 단부의 내주면(14)은 동일 평면에 위치하는 것을 특징으로 하는 모터.
- 제7항에 있어서,상기 영구자석(12)의 내주면은 상기 영구자석(12)의 중심선(CL)을 기준으로 대칭이 되도록 형성된 것을 특징으로 하는 모터.
- 제 8항에 있어서,상기 회전자(10)의 회전중심(C)에서 상기 폴 슈(22)의 중심 끝단까지의 거리를 D2라고 하고, 상기 회전자(10)의 회전중심(C)에서 상기 영구자석(12)의 양측 단부의 내주면(14)까지의 거리를 D1이라고 할 때,D1 < D2의 관계를 만족하는 것을 특징으로 하는 모터.
- 제2항에 있어서,상기 회전자(10)의 회전중심(C)을 기준으로 상기 영구자석(12)의 양측 단부의 끝단 사이의 각도를 θ1, 상기 영구자석(12)의 중앙부의 내주면(13)의 양측 끝단 사이의 각도를 θ2라 할 때,0.65 ≤ θ2/θ1 ≤ 0.67 또는 0.84 ≤ θ2/θ1 ≤ 0.86의 관계를 만족하는 것을 특징으로 하는 모터.
- 제10항에 있어서,상기 회전자(10)의 회전중심(C)을 기준으로 상기 폴 슈(22)의 양측 끝단 사이의 각도를 θ3라 할 때,θ2 < θ3의 관계를 만족하는 것을 특징으로 하는 모터.
- 제3항에 있어서,상기 폴 슈(22)의 중앙부의 외주면(23)은 일정 곡률을 갖는 곡면 형상으로 형성되는 것을 특징으로 하는 모터.
- 제12항에 있어서,상기 회전자(10)의 회전중심(C)을 기준으로 상기 폴 슈(22)의 중앙부의 외주면(23)의 양측 끝단 사이의 각도를 θ4라 할 때,0˚ ≤ θ4 ≤ 1.5˚의 관계를 만족하는 것을 특징으로 하는 모터.
- 제3항에 있어서,상기 폴 슈(22)의 양측 단부의 외주면(24)은 평면 형상을 갖는 것을 특징으로 하는 모터.
- 제 14항에 있어서,상기 폴 슈(22)의 양측 단부의 외주면(24)이 상기 폴 슈(22)의 중앙부와 양측 단부가 만나는 점에서 상기 폴 슈(22)의 중앙부의 외주면(23)의 접선과 이루는 각도를 β라 할 때,7˚ ≤ β ≤ 9˚의 관계를 만족하는 것을 특징으로 하는 모터.
- 제3항에 있어서,상기 영구자석(12)의 양측 단부의 내주면(14)은 평면 형상을 가지며,상기 영구자석(12)의 양측 단부의 내주면(14)은 상기 영구자석(12)의 중앙부와 양측 단부가 만나는 점에서 상기 중앙부의 내주면의 접선에 대하여 일정 각도(α)를 이루며 형성되고,상기 폴 슈(22)의 양측 단부의 외주면(24)은 평면 형상을 가지며,상기 폴 슈(22)의 양측 단부의 외주면(24) 끝단부는 상기 폴 슈(22)의 중앙부의 외주면(23)의 연장선상으로부터 반경 방향으로 일정 거리(L2)를 이루며 형성되되,상기 영구자석(12)의 양측 단부의 내주면(14)이 상기 영구자석(12)의 중앙부와 양측 단부가 만나는 점에서 상기 영구자석(12)의 중앙부의 내주면(13)의 접선과 이루는 각도(α)와,상기 폴 슈(22)의 양측 단부의 외주면(24)이 상기 폴 슈(22)의 중앙부와 양측 단부가 만나는 점에서 상기 폴 슈(22)의 중앙부의 외주면(23)의 접선과 이루는 각도(β)가,α > β의 관계를 만족하는 것을 특징으로 하는 모터.
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EP18813810.1A EP3637589B1 (en) | 2017-06-09 | 2018-06-07 | Motor |
JP2019567723A JP7265997B2 (ja) | 2017-06-09 | 2018-06-07 | モータ |
US16/620,396 US11381144B2 (en) | 2017-06-09 | 2018-06-07 | Motor |
CN201880049855.XA CN110999033B (zh) | 2017-06-09 | 2018-06-07 | 马达 |
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