WO2024029770A1 - 브러쉬리스 모터 - Google Patents
브러쉬리스 모터 Download PDFInfo
- Publication number
- WO2024029770A1 WO2024029770A1 PCT/KR2023/009862 KR2023009862W WO2024029770A1 WO 2024029770 A1 WO2024029770 A1 WO 2024029770A1 KR 2023009862 W KR2023009862 W KR 2023009862W WO 2024029770 A1 WO2024029770 A1 WO 2024029770A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- motor
- rotor
- pole shoe
- permanent magnets
- clause
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- 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
-
- 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]
-
- 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
-
- 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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to a brushless motor, and more specifically, to a motor that can minimize the distortion factor of the no-load back electromotive force of the motor and reduce torque ripple and cogging torque.
- Hybrid cars and electric cars obtain power to propel the vehicle through an electric motor. Accordingly, unlike the widespread use of mechanical compressors in existing vehicle air conditioning systems, there is a recent trend toward using electric compressors.
- the electric compressor includes an electric motor that converts electrical energy into mechanical energy and an inverter that controls the rotation of the electric motor.
- the electric motor of such an electric compressor generally consists of a cylindrical rotor and a stator with a coil wound around its outer circumference, and is divided into distributed winding and concentrated winding depending on the coil winding method.
- the rotor included in the electric motor rotates as current flows through the coil by power supplied from the inverter, and the rotational force of the rotor is transmitted to the rotating shaft.
- the mechanical means which receives mechanical energy from the rotating shaft, compresses the refrigerant through reciprocating motion.
- Electric compressors have the disadvantage of being inferior in refrigerant compression performance compared to existing mechanical compressors. This is because the driving force generated by an electric motor is weak compared to a mechanical compressor driven using the rotational force of an engine, vibration is severe, and the control performance of the inverter is poor. It was because of a problem that was not high. Additionally, the efficiency of the electric motor was low, so there was a problem that the electricity supplied to the vehicle was wasted.
- Cogging torque and torque ripple generated by the interaction between the permanent magnet and the slot, and the motor with the slot present. Cogging torque and torque ripple are bound to exist.
- Cogging torque is a radial force that tries to move the motor system to a position where the magnetic energy of the motor system is minimum, that is, in an equilibrium state. It is a non-uniform torque generated by the interaction between the magnetic pole of the permanent magnet and the slot, regardless of the load current. , which has a significant impact on the control and precision of the motor.
- FIG 1 is a diagram showing a conventional electric compressor motor.
- the conventional electric compressor motor 3 has an internal resistance structure in which the rotor 4 rotates inside the stator 5, and the motor consists of 6 poles and 27 slots. , it has a distribution method in which the coils are widely distributed over several dimensions.
- the rotation speed is relatively low (about 10,000 rpm) and the load on the motor is high, so reduction of the weight and size of the motor is required.
- Multipolar design is necessary to reduce the weight and size of the motor.
- the electric motor must be designed in a way that increases the number of motor poles and reduces stacking, but as mentioned above, there are not many specific research results on this.
- Patent Document Korean Patent Publication No. 10-2018-0113296 (published on October 16, 2018)
- the present invention was developed to solve the above problems, and provides design values for motor components and an optimized pole/slot combination that can minimize the distortion of the no-load back electromotive force of the motor and reduce torque ripple and cogging torque. There is a purpose to that.
- the present invention is a brushless motor, comprising: a stator in which a plurality of winding slots are formed along the circumferential direction on the inner circumference of an axially hollow body; a rotor installed axially inside the stator and having a plurality of insertion grooves formed along the circumferential direction on the outer circumference; and a plurality of permanent magnets each inserted into the plurality of insertion grooves of the rotor, wherein a combination of the number of poles corresponding to the number of the plurality of permanent magnets and the number of slots corresponding to the number of the plurality of winding slots is used.
- cogging torque and torque ripple can be reduced.
- the motor according to an example of the present invention may have a 10-pole, 24-slot structure in which the plurality of permanent magnets are composed of 10 and the plurality of winding slots are composed of 24.
- the ratio (Rr/Rs) of the radial length (Rr) of the rotor to the radial length (Rs) of the stator is 0.594 ⁇ Rr/Rs ⁇ 0.646 can be satisfied.
- the arc angle ( ⁇ ) may satisfy 28° ⁇ ⁇ ⁇ 32°.
- the ratio (Rm/Rr) of the radius length (Rr) of the rotor to the shortest distance (Rm) is 0.847 ⁇ Rm/Rr ⁇ 0.898 can be satisfied.
- the rotor is formed with a plurality of hollow holes penetrating the rotor in the axial direction, and the hollow holes may be composed of 10 corresponding to the plurality of permanent magnets.
- the rotor is formed with a plurality of rivet holes through which rivets are inserted through the rotor in the axial direction, and the number of rivet holes may be formed between adjacent hollow holes, so that there are 10 rivet holes.
- a motor according to another example of the present invention may have a 10-pole, 12-slot structure in which the plurality of permanent magnets are composed of 10 and the plurality of winding slots are composed of 12.
- a pole shoe is formed at the tip of each of the plurality of stator teeth forming the plurality of winding slots, and the opposing surface of the pole shoe facing the outer peripheral surface of the rotor has a predetermined curvature, and the radial direction of the opposing surface of the pole shoe is The curvature at the center and the curvature at the radial ends may be different.
- the radius of curvature (Rs_In) of the opposing surface of the pole shoe may satisfy 30 mm ⁇ Rs_in ⁇ 120 mm.
- the minimum thickness of the pole shoe may be 0.8 mm or more.
- the radius of curvature of the radial center of the opposing surface of the pole shoe is 30 mm, and the radius of curvature of the radial end of the opposing surface of the pole shoe is 120 mm, and the radius of curvature gradually increases as it progresses from the center of the opposing surface of the pole shoe to the end. can do.
- the thickness of the pole shoe at the radial end of the opposing surface of the pole shoe may be 0.8 mm.
- the pole shoe may have a mirror symmetrical shape with respect to the radial center of the pole shoe.
- a motor according to another example of the present invention may have a 10-pole, 27-slot structure in which the plurality of permanent magnets are composed of 10 and the plurality of winding slots are composed of 27.
- the ratio (Rr/Rs) of the radial length (Rr) of the rotor to the radial length (Rs) of the stator is 0.520 ⁇ Rr/Rs ⁇ 0.646 can be satisfied.
- the arc angle ( ⁇ ) may satisfy 29° ⁇ ⁇ ⁇ 32°.
- the web thickness (WD) may satisfy 1.6 mm ⁇ WD ⁇ 2.2 mm.
- the distortion factor of the no-load back electromotive force of the motor can be minimized, and the torque ripple and cogging torque are reduced through the optimal design of the permanent magnet. This can result in reduced motor vibration and noise.
- Figure 1 is a diagram showing a conventional electric compressor motor.
- Figure 2 is a cross-sectional view of a motor according to the first embodiment of the present invention.
- Figure 3 is a cross-sectional view of the stator and rotor.
- Figure 4 is a diagram for explaining web thickness and bridge thickness.
- Figure 5 is a graph showing the efficiency characteristics of the motor according to web thickness.
- Figure 6 is a graph showing the efficiency characteristics of the motor according to the bridge thickness.
- Figure 7 is a diagram for explaining design variables of a motor.
- Figure 8 is a graph showing torque ripple characteristics according to the ratio of the radius length of the rotor to the radius length of the stator.
- Figure 9 is a graph showing the efficiency of the motor and the distortion rate characteristics of the back electromotive force according to the size of the arc angle.
- Figure 10 is a graph showing torque ripple characteristics according to the radius length of the rotor for the shortest distance to the permanent magnet.
- 11 and 12 are cross-sectional views of a motor according to a second embodiment of the present invention.
- Figure 13 is a diagram comparing a conventional motor and the motor of the present invention.
- Figure 14 is a diagram for explaining a pole shoe according to an example of the present invention.
- Figure 15 is a graph comparing the cogging torque of a conventional motor and a motor of the present invention.
- Figure 16 is a graph comparing the load torque of the conventional motor and the motor of the present invention.
- Figure 17 is a cross-sectional view of a motor according to a third embodiment of the present invention.
- Figure 18 is a diagram comparing a conventional motor and the motor of the present invention.
- Figure 19 is a diagram to explain the design variables of the motor.
- Figure 20 is a graph showing torque ripple characteristics according to the ratio of the radius length of the rotor to the radius length of the stator.
- Figure 21 is a graph showing the efficiency of the motor and the distortion rate characteristics of the back electromotive force according to the size of the arc angle.
- the motor of the present invention may be a brushless motor provided in an electric compressor for a vehicle.
- An electric compressor for a vehicle generally includes a compression unit in which the refrigerant is compressed by the reciprocating motion of the mechanical structure, an electric motor that transfers mechanical energy to the compression unit, and an inverter that supplies electrical energy to the electric motor, according to the present invention.
- the motor may correspond to an electric motor applied to such a general automotive electric compressor.
- the motor of the present invention will be examined in detail through each embodiment.
- 2 to 10 are diagrams for explaining the motor of the first embodiment of the present invention.
- Figure 2 is a cross-sectional view of a motor according to the first embodiment of the present invention
- Figure 3 is a cross-sectional view of a stator and a rotor.
- the motor 10 of the present invention includes a stator 100 and a rotor 200. It includes a plurality of permanent magnets (M) inserted into the rotor 200.
- M permanent magnets
- the stator 100 is formed in a substantially cylindrical shape and includes a body 110 that is hollow in the axial direction, and a plurality of winding slots 120 are formed along the circumferential direction on the hollow inner circumference of the body 110, each winding slot.
- a coil (C) is wound at (120).
- Each winding slot 120 is formed through the axial direction of the body and spaced apart from each other, and the coil C may be wound in a distributed manner widely distributed across several winding slots 120.
- the rotor 200 is a cylindrical member installed axially inside the stator 100, that is, in the hollow of the body 110.
- the rotor 200 may have a plurality of permanent magnets combined so that it can rotate by receiving electromagnetic force generated as a current flows through the coil C wound on the stator 100.
- a plurality of insertion grooves 210 may be formed so that each of the plurality of permanent magnets can be inserted.
- Each insertion groove 210 is formed through the axial direction and is spaced apart from each other along the circumferential direction.
- a plurality of hollow holes 230 penetrating the rotor in the axial direction may be formed in the rotor 200 corresponding to the permanent magnets M, and a rivet hole 240 may be formed between adjacent hollow holes 230.
- the rivet hole 240 may have a structure that penetrates the inside of the rotor 200 in the axial direction, and a plurality of steel plates are inserted into the rivet hole 240 to form the rotor. This can be permanently combined. More specifically, as will be described later, the hollow holes 230 are composed of 10 corresponding to the number of permanent magnets (M), and the rivet holes 240 are formed between the hollow holes and can be composed of 10. This can help improve the flux characteristics by permanent magnets and the manufacturability of the rotor, and can reduce weight compared to conventional electric compressor motors.
- a plurality of permanent magnets (M) are respectively inserted into the insertion grooves 210 in the axial direction, and permanent magnets (M) of different poles may be inserted into adjacent insertion grooves 210. That is, in the motor 10 of the present invention, the permanent magnet (M) is not attached to the surface of the rotor but is embedded inside the surface of the rotor, and in this case, magnetic torque (Magnetic Torque) is generated according to the arrangement of the magnetic field and the intensity of the magnetic field. Since reluctance torque (torque according to changes in magnetic resistance) can be used in addition to torque), the same torque can be generated using less current, increasing the efficiency of the motor.
- Magnetic Torque Magnetic Torque
- the motor 10 of the present invention consists of 24 winding slots 120 and 10 permanent magnets (M), forming a 10-pole, 24-slot structure. That is, 24 winding slots 120 are formed in the stator 100, and the 24 winding slots are provided at regular intervals so that each winding slot forms an angle of about 13 degrees with the adjacent winding slot 120.
- 10 insertion grooves 210 are formed in the rotor 200, and the 10 insertion grooves are provided at regular intervals so that each insertion groove forms an angle of about 36 degrees with the adjacent insertion groove, and the insertion of this structure
- a plurality of permanent magnets (M) are respectively inserted into the groove 210 and formed to correspond to the structure of the insertion groove 210.
- the motor 10 of the present invention adopts a 10-pole, 24-slot structure.
- This 10-pole, 24-slot structure is a desirable structure for minimizing the distortion factor of the no-load back electromotive force, and is very advantageous in reducing cogging torque that generates noise during operation due to the pole/slot combination.
- FIG 4 is a diagram for explaining the web thickness and bridge thickness
- Figure 5 is a graph showing the efficiency characteristics of the motor according to the web thickness
- Figure 6 is a graph showing the efficiency characteristics of the motor according to the bridge thickness
- the present invention Considering the data and the size and thickness of the motor, configure 10 permanent magnets (M).
- the present invention can minimize the distortion of the no-load back electromotive force by configuring 24 winding slots 120 corresponding to 10 permanent magnets (M), which is the optimal number of poles considering the switching frequency of the inverter.
- the motor of the present invention can minimize the distortion of the no-load back electromotive force and greatly reduce the cogging torque and torque ripple, thereby reducing the vibration and noise of the motor, and at the same time, improving the motor's Manufacturability can also be secured.
- Figure 7 is a diagram to explain the design variables of the motor, including the center of the rotor (O), the arc angle ( ⁇ ), the radius length of the stator (Rs), the radius length of the rotor (Rr), and the shortest distance to the permanent magnet. Shows the distance (Rm).
- the arc angle ( ⁇ ) is the angle formed between the center of the rotor (O) and both ends of one of the plurality of permanent magnets (M), that is, the angle formed by both ends of each permanent magnet (M) with the center (O) of the rotor.
- the radius length (Rs) of the stator means the distance from the center (O) of the rotor to the outer peripheral surface of the stator (100).
- the radius length (Rr) of the rotor means the distance from the center of the rotor (O) to the outer peripheral surface of the rotor 200.
- the shortest distance to the permanent magnet (Rm) is the shortest distance from the center of the rotor (O) to any one of the plurality of permanent magnets (M), that is, the shortest distance between each permanent magnet (M) and the center of the rotor (O). means distance.
- Figure 8 is a graph showing torque ripple characteristics according to the ratio of the radius length of the rotor to the radius texture of the stator. As shown, at rated load, there is a torque ripple of about 7.6% or less when the radius-length ratio (Rr/Rs) is in the range of 0.594 to 0.646, and when the length ratio (Rr/Rs) is in this range, the torque Ripple is minimized, thereby minimizing motor vibration and noise.
- Table 1 above is a table showing the graph of FIG. 8 as data.
- the torque ripple rapidly decreases starting from the length ratio (Rr/Rs) of 0.594, increases again starting from about 0.63, and increases again starting from 0.646. It can be seen that the torque ripple increases rapidly again.
- the torque ripple has a range (1) of about 7.6% or less and 3.6% or more
- the torque ripple is It has a range (2) of approximately 4.9% or less and 3.6% or more.
- the motor of the present invention has a ratio (Rr/Rs) of the radius length of the rotor (Rr) to the radius length of the stator (Rs) of 0.594 ⁇ Rr/Rs ⁇ 0.646. It can be configured to satisfy, and more preferably, the length ratio (Rr/Rs) can be configured to satisfy 0.618 ⁇ Rr/Rs ⁇ 0.646.
- Figure 9 is a graph showing the efficiency of the motor and the distortion rate characteristics of the back electromotive force according to the size of the arc angle. As shown, it can be seen that the size of the arc angle ( ⁇ ) maintains an efficiency of about 95.23% or more in the range of 28° to 32° and is effective in reducing the distortion factor (THD) of back electromotive force.
- Table 2 above is a table showing the graph of FIG. 9 as data.
- the efficiency of the motor increases linearly from 95.24% to 95.43% (1), while the arc angle ( ⁇ ) increases linearly.
- the distortion rate does not increase significantly from about 0.62% to 0.75% (2). Rather, when the size of the arc angle ( ⁇ ) is between 30° and 32°, the distortion rate is about 0.75% to 0.72%. It can be seen that it decreases by % (3).
- the motor of the present invention can be configured so that the arc angle ( ⁇ ) satisfies 28° ⁇ 32°, and more preferably, the arc angle ( ⁇ ) The size of can be configured to satisfy 30° ⁇ 32°.
- Figure 10 is a graph showing torque ripple characteristics according to the radius length of the rotor for the shortest distance to the permanent magnet. As shown, there is a cogging torque of about 7% or less and a torque ripple of about 6% or less when the radius-length ratio (Rm/Rr) is in the range of 0.847 to 0.898, and the length ratio (Rm/Rr) is within that range. When equipped, torque ripple is minimized and vibration and noise of the motor can be minimized.
- Table 3 above is a table showing the graph of FIG. 10 as data.
- the torque ripple decreases rapidly starting from the length ratio (Rm/Rs) of 0.847, and increases again starting from about 0.865, but increases gently to 0.898. It can be seen that In that range, that is, the length ratio range of 0.847 to 0.898, the torque ripple ranges from about 5.5% to 3.6% (1), showing low torque ripple characteristics. When the length ratio (Rm/Rs) is in the range of 0.85 to 0.88, the torque ripple ranges from about 0.44% or less to 3.6% or more (2), so better torque ripple characteristics can be achieved.
- the cogging torque increases linearly correspondingly. Specifically, when the length ratio (Rm/Rs) is in the range of 0.847 to 0.898, the cogging torque is about 0.007 Nm or more and 0.026 Nm or less. It has a range (3), showing low cogging torque characteristics. When the length ratio (Rm/Rs) is in the range of 0.85 to 0.88, the cogging torque has a range (4) of about 0.008 Nm to 0.022, and thus better cogging torque characteristics can be obtained.
- the motor of the present invention has a ratio (Rm/Rr) of the radius length (Rr) of the rotor to the shortest distance (Rm) to the permanent magnet of 0.847 ⁇ Rm/Rr. It may be configured to satisfy ⁇ 0.898, and more preferably, the length ratio (Rm/Rr) may be configured to satisfy 0.85 ⁇ Rm/Rr ⁇ 0.88.
- each design variable described above is related to each other by the size, shape, and arrangement of each component that makes up the motor, and the relevant design variable is such that the range of each design variable is satisfied by considering the relationship between each design variable.
- Each of these can be implemented by overlapping within one motor, and in this case, the efficiency, torque ripple, and cogging torque characteristics of the motor can be improved to the maximum.
- 11 to 16 are diagrams for explaining the motor of the second embodiment of the present invention. Content that overlaps with what was explained previously will be omitted.
- the motor 10 of this example consists of 10 permanent magnets (M) and 12 plurality of winding slots 120, resulting in a 10-pole, 12-slot structure.
- M permanent magnets
- the cogging torque frequency is of the 60th order, which has an advantage over conventional motors in terms of improving vibration and noise of the motor.
- the shape of the pole shoe is different from that of the pole shoe of a conventional motor.
- a plurality of stator teeth 130 forming a plurality of winding slots are formed on the stator, and a pole shoe 140 is formed at the tip of each of the plurality of stator teeth 130 to predeterminedly protrude in the radial direction from each stator tooth.
- the opposing surface 140A of the pole shoe is generally the opposing surface of the rotor 200. While the outer peripheral surface is formed with the same curvature as the outer peripheral surface of the rotor 200, in the present invention, the opposing surface 140A of the pole shoe has a predetermined curvature, but is not the same curvature as the outer peripheral surface of the rotor 200.
- the curvature at the radial center (c) of the opposing surface (140A) of the pole shoe is configured to be different from the curvature at the radial end (e).
- Figure 13 is a diagram showing a comparison between a conventional motor and a motor of the present invention.
- the opposing surface of the pole shoe is formed with a constant curvature, and at this time, the cogging torque is 126 mNm and the torque ripple is 465 mNm and 6.68%. There will be deviations.
- the opposing surface (140A) of the pole shoe is formed with a different curvature at the center and end, and at this time, the cogging torque is 44 mNm and the torque ripple has a deviation of 214 mNm and 3.19%, compared to the conventional one. It can be seen that cogging torque and torque ripple are significantly reduced.
- the present invention can be configured so that the radius of curvature (Rs_in) of the opposing surface of the pole shoe satisfies 30 mm ⁇ Rs_in ⁇ 120 mm, and accordingly, The efficiency of the motor can be increased.
- the pole shoe it is desirable for the pole shoe to have a predetermined thickness or more, and accordingly, the present invention can be configured so that the minimum thickness of the pole shoe 140 satisfies 0.8 mm or more.
- Figure 14 is a diagram for explaining a pole shoe according to an example of the present invention.
- the radius of curvature of the radial center (c) of the opposing surface (140A) of the pole shoe is 30 mm, and the opposing surface (140A) of the pole shoe
- the radius of curvature of the radial end (e) is 120 mm, and the radius of curvature may gradually increase as it progresses from the center (c) of the opposing surface (140A) of the pole shoe to the end (e), and the degree of increase is
- the radius of curvature may increase uniformly to be constant.
- the radius of curvature (Rs_in) increases.
- the thickness at the radial end (e) of the opposing surface (140A) of the pole shoe may be 0.8 mm.
- the pole shoe 140 of the present invention may have a mirror symmetrical shape with respect to the radial center (c) of the pole shoe.
- Figure 15 is a graph comparing the cogging torque of the conventional motor and the motor of the present invention. As shown, the conventional motor has a large cogging torque in the range of -0.06 to 0.06, while the present invention has a large cogging torque in the range of -0.02 to 0.02. It can be seen that the cogging torque is small.
- Figure 16 is a graph comparing the load torque of the conventional motor and the motor of the present invention. As shown, the conventional motor has a large load torque in the range of 6.45 to 6.92, while the load torque of the present invention is in the range of 6.58 to 6.8. It can be seen that is formed small.
- the motor has a 10-pole, 12-slot structure, and the radius of curvature of the opposing surface of the pole shoe is formed within 30 to 120 mm, and the radius of curvature increases as it progresses from the radial center of the pole shoe to the end.
- torque ripple during operation is minimized, which is effective in improving vibration and noise, and at the same time has the advantage of reducing the overall weight of the motor compared to conventional motors.
- 17 to 21 are diagrams for explaining the motor of the third embodiment of the present invention. Content that overlaps with what was explained previously will be omitted.
- FIG 17 is a cross-sectional view of a motor according to a third embodiment of the present invention.
- the motor 10 of this example consists of 10 permanent magnets (M) and 27 winding slots 120, resulting in 10 It has a 27-slot structure.
- M permanent magnets
- 27 winding slots 120 resulting in 10 It has a 27-slot structure.
- the influence of weight according to area change is relatively larger for electrical steel sheets than for permanent magnets. Therefore, in order to improve the cogging torque and performance of the motor and reduce weight, the area of the electrical steel sheets must be shaped as much as possible. needs to be optimized.
- the present invention adopts a 10-pole 27-slot structure.
- this motor can be configured with 10 hollow holes and rivet holes in the rotor, each corresponding to a permanent magnet.
- Figure 18 is a diagram showing a comparison between the conventional motor and the motor of the present invention.
- the conventional motor has an efficiency of 94.6%, a cogging torque of 0.027 Nm, and a rotor weight of 532g
- the motor of the present invention has a motor of the present invention.
- the efficiency is 94.7%
- the cogging torque is 0.019
- the rotor weight is 374g. It can be seen that the efficiency of the motor is increased compared to the prior art, and at the same time, the cogging torque and rotor weight are significantly reduced.
- Figure 19 is a diagram for explaining the design variables of the motor.
- the ratio (Rr/Rs) of the radius length of the rotor (Rr) to the radius length of the stator (Rs) is 0.520 ⁇ Rr/Rs ⁇ 0.646 is satisfied, the arc angle ( ⁇ ) satisfies 29° ⁇ ⁇ ⁇ 32°, and the web thickness (WD) satisfies 1.6mm ⁇ WD ⁇ 2.2mm.
- the thickness (WD) of the web may correspond to the gap between two adjacent insertion grooves among the plurality of insertion grooves 210.
- Figure 20 is a graph showing the torque ripple characteristics according to the ratio of the radius length of the rotor to the radius length of the stator.
- the ratio of the radius length (Rr) of the rotor to the radius length (Rs) of the stator ( Rr/Rs) has a range of 0.520 ⁇ Rr/Rs ⁇ 0.646, preferably 0.54 to 0.6, and it can be confirmed that the torque ripple is formed as small as about 10.8% in that range.
- Figure 21 is a graph showing the efficiency of the motor and the distortion rate characteristics of the back electromotive force according to the size of the arc angle.
- the arc angle is in the range of 29° ⁇ ⁇ ⁇ 32°, and the efficiency of the motor in that range is about 95.1. It can be confirmed that the distortion factor (THD) of the no-load back electromotive force is formed as small as about 1.2% or less.
- the motor has a 10-pole, 27-slot structure, and the ratio of the radius length of the rotor to the radius length of the stator, the arc angle, and the thickness of the web are design variables, and the corresponding As each design variable is limited to an appropriate range, vibration noise can be minimized by minimizing torque ripple, high motor efficiency can be provided, and back electromotive force THD can be effectively reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims (18)
- 브러쉬리스 모터로서,축방향으로 중공된 몸체의 내주측에 원주방향을 따라 복수의 권선 슬롯이 형성되는 고정자;상기 고정자의 내부에 축방향으로 설치되며, 외주측에 원주방향을 따라 복수의 삽입홈이 형성되는 회전자; 및상기 회전자의 복수의 삽입홈에 각각 삽입되는 복수의 영구자석;을 포함하며,상기 복수의 영구자석의 수에 해당하는 극수와, 상기 복수의 권선 슬롯의 수에 해당하는 슬롯수의 조합을 달리하여, 코깅토크와 토크리플을 저감할 수 있는,모터.
- 제1항에 있어서,상기 복수의 영구자석은 10개로 구성되고 상기 복수의 권선 슬롯은 24개로 구성되어 10극 24슬롯 구조를 가지는,모터.
- 제2항에 있어서,상기 고정자의 반경 길이를 Rs라 하고, 상기 회전자의 반경 길이를 Rr이라 하면,상기 고정자의 반경 길이(Rs)에 대한 상기 회전자의 반경 길이(Rr)의 비(Rr/Rs)는 0.594 ≤ Rr/Rs ≤ 0.646 를 만족하는,모터.
- 제3항에 있어서,상기 회전자의 중심과 상기 복수의 영구자석 중 어느 하나의 양단이 이루는 원호각을 α라 하면,상기 원호각(α)은 28° ≤ α ≤ 32° 를 만족하는,모터.
- 제4항에 있어서,상기 회전자의 중심으로부터 상기 복수의 영구자석 중 어느 하나까지의 최단거리를 Rm이라 하면,상기 최단거리(Rm)에 대한 상기 회전자의 반경 길이(Rr)의 비(Rm/Rr)는 0.847 ≤ Rm/Rr ≤ 0.898 를 만족하는,모터.
- 제5항에 있어서,상기 회전자에는 상기 회전자를 축방향으로 관통하는 중공홀이 복수 형성되며,상기 중공홀은 상기 복수의 영구자석에 대응하여 10개로 구성되는,모터.
- 제6항에 있어서,상기 회전자에는 상기 회전자를 축방향으로 관통하여 리벳이 삽입되는 리벳홀이 복수 형성되며,상기 리벳홀은 인접한 상기 중공홀 사이마다 형성되어 10개로 구성되는,모터.
- 제1항에 있어서,상기 복수의 영구자석은 10개로 구성되고 상기 복수의 권선 슬롯은 12개로 구성되어 10극 12슬롯 구조를 가지는,모터.
- 제8항에 있어서,상기 복수의 권선 슬롯을 형성하는 복수의 고정자 치 각각의 선단에 폴슈가 형성되고,상기 회전자의 외주면과 대향하는 상기 폴슈의 대향면은 소정의 곡률을 가지되,상기 폴슈의 대향면의 반경방향 중심에서의 곡률과 반경방향 끝단부에서의 곡률이 상이한,모터.
- 제9항에 있어서,상기 폴슈의 대향면의 일 지점에서의 곡률 반경을 Rs_In 이라 하면,상기 폴슈의 대향면의 곡률 반경(Rs_In)은 30mm ≤ Rs_in ≤ 120mm 을 만족하는,모터.
- 제10항에 있어서,상기 폴슈의 최소 두께는 0.8mm 이상인,모터.
- 제11항에 있어서,상기 폴슈의 대향면의 반경방향 중심의 곡률 반경은 30mm 이고,상기 폴슈의 대향면의 반경방향 끝단부의 곡률 반경은 120mm 이며,상기 폴슈의 대향면의 중심으로부터 끝단부로 진행할수록 곡률 반경이 점진적으로 증가하는,모터.
- 제12항에 있어서,상기 폴슈의 대향면의 반경방향 끝단부에서의 상기 폴슈의 두께는 0.8mm 인,모터.
- 제13항에 있어서,상기 폴슈는 상기 폴슈의 반경방향 중심을 기준으로 거울 대칭 형상을 가지는,모터.
- 제1항에 있어서,상기 복수의 영구자석은 10개로 구성되고 상기 복수의 권선 슬롯은 27개로 구성되어 10극 27슬롯 구조를 가지는,모터.
- 제15항에 있어서,상기 고정자의 반경 길이를 Rs라 하고, 상기 회전자의 반경 길이를 Rr이라 하면,상기 고정자의 반경 길이(Rs)에 대한 상기 회전자의 반경 길이(Rr)의 비(Rr/Rs)는 0.520 ≤ Rr/Rs ≤ 0.646 를 만족하는,모터.
- 제16항에 있어서,상기 회전자의 중심과 상기 복수의 영구자석 중 어느 하나의 양단이 이루는 원호각을 α라 하면,상기 원호각(α)은 29° ≤ α ≤ 32° 를 만족하는,모터.
- 제17항에 있어서,상기 복수의 삽입홈 중 인접한 두 삽입홈 사이의 간격을 웹의 두께(WD)라 하면,상기 웹의 두께(WD)는 1.6mm ≤ WD ≤ 2.2mm 를 만족하는,모터.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/841,493 US20250183739A1 (en) | 2022-08-05 | 2023-07-11 | Brushless motor |
| DE112023001978.9T DE112023001978T5 (de) | 2022-08-05 | 2023-07-11 | Bürstenloser motor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020220097650A KR20240019883A (ko) | 2022-08-05 | 2022-08-05 | 브러쉬리스 모터 |
| KR10-2022-0097650 | 2022-08-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024029770A1 true WO2024029770A1 (ko) | 2024-02-08 |
Family
ID=89849122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2023/009862 Ceased WO2024029770A1 (ko) | 2022-08-05 | 2023-07-11 | 브러쉬리스 모터 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20250183739A1 (ko) |
| KR (1) | KR20240019883A (ko) |
| DE (1) | DE112023001978T5 (ko) |
| WO (1) | WO2024029770A1 (ko) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060244336A1 (en) * | 2005-04-28 | 2006-11-02 | Denso Corporation | Electric motor with minimized cogging and related method of determining stator pole geometry |
| KR20120030307A (ko) * | 2010-09-20 | 2012-03-28 | 한라공조주식회사 | 차량용 전동 압축기 |
| KR20120047962A (ko) * | 2009-11-24 | 2012-05-14 | 미쓰비시덴키 가부시키가이샤 | 영구자석형 회전 전기기계 및 이것을 이용한 전동 파워 스티어링 장치 |
| KR20150067898A (ko) * | 2013-12-10 | 2015-06-19 | 학교법인 두원학원 | 전동식압축기 구동부의 구조 |
| KR101633014B1 (ko) * | 2016-01-14 | 2016-06-23 | 노순창 | 코깅 토르크를 최소화하는 영구자석 회전장치와 이를 이용한 영구자석발전기 및 영구자석전동기 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180113296A (ko) | 2017-04-06 | 2018-10-16 | 한온시스템 주식회사 | 브러시 모터 |
-
2022
- 2022-08-05 KR KR1020220097650A patent/KR20240019883A/ko active Pending
-
2023
- 2023-07-11 WO PCT/KR2023/009862 patent/WO2024029770A1/ko not_active Ceased
- 2023-07-11 US US18/841,493 patent/US20250183739A1/en active Pending
- 2023-07-11 DE DE112023001978.9T patent/DE112023001978T5/de active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060244336A1 (en) * | 2005-04-28 | 2006-11-02 | Denso Corporation | Electric motor with minimized cogging and related method of determining stator pole geometry |
| KR20120047962A (ko) * | 2009-11-24 | 2012-05-14 | 미쓰비시덴키 가부시키가이샤 | 영구자석형 회전 전기기계 및 이것을 이용한 전동 파워 스티어링 장치 |
| KR20120030307A (ko) * | 2010-09-20 | 2012-03-28 | 한라공조주식회사 | 차량용 전동 압축기 |
| KR20150067898A (ko) * | 2013-12-10 | 2015-06-19 | 학교법인 두원학원 | 전동식압축기 구동부의 구조 |
| KR101633014B1 (ko) * | 2016-01-14 | 2016-06-23 | 노순창 | 코깅 토르크를 최소화하는 영구자석 회전장치와 이를 이용한 영구자석발전기 및 영구자석전동기 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20250183739A1 (en) | 2025-06-05 |
| KR20240019883A (ko) | 2024-02-14 |
| DE112023001978T5 (de) | 2025-02-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP4117153B1 (en) | Salient pole-type hybrid excitation motor | |
| WO2012039545A1 (en) | Electric motor-driven compressor for vehicle | |
| CN1350357A (zh) | 环式电机 | |
| CN110061603B (zh) | 一种转子磁路解耦型高速混合励磁同步电机 | |
| WO2013085231A1 (ko) | 두께가 다른 영구자석을 갖는 회전자 및 그를 포함하는 모터 | |
| WO2020004726A1 (ko) | Isg 시스템용 계자권선형 모터발전기의 효율 향상을 위한 보조 영구자석을 구비하는 회전자 구조 | |
| CN116846106B (zh) | 一种低磁密畸变率的永磁发电机与稳压发电系统 | |
| WO2011059162A1 (ko) | 에이에프피엠과 알에프피엠 복합 모터 및 발전기 | |
| WO2019156419A1 (ko) | 스테이터 구조를 개선한 듀얼 로터 타입 모터 및 이를 포함하는 압축기 | |
| CN103222156A (zh) | 一种铁氧体三相永磁电机 | |
| WO2021187820A1 (ko) | 고정자 비대칭 슈를 이용한 전동기 및 그 제작 방법 | |
| WO2024029770A1 (ko) | 브러쉬리스 모터 | |
| WO2022220579A1 (ko) | 프로펠러 구동장치 및 이를 이용한 드론 | |
| WO2018124634A1 (ko) | 로터 및 이를 포함하는 모터 | |
| WO2018012885A1 (ko) | 로터 및 이를 포함하는 모터 | |
| WO2022231127A1 (ko) | 브러쉬리스 모터 | |
| WO2024039067A1 (en) | Rotor core structure of motor and rotor of motor including the same | |
| WO2025173878A1 (ko) | 영구자석 회전기 | |
| JP2001119875A (ja) | 同期機及びそれを用いた電気自動車用回転電機 | |
| WO2020251244A1 (ko) | 모터 | |
| CN112072815A (zh) | 一种电动摩托车用高速内转子电机 | |
| WO2021071171A1 (ko) | 전기모터용 스테이터 및 이를 포함하는 전기모터 | |
| WO2026049177A1 (ko) | 영구자석 회전기의 회전자 | |
| WO2017073821A1 (ko) | 회전자 및 이를 포함하는 영구자석형 전동기 | |
| WO2019135642A1 (ko) | 발전기 모듈 및 이를 포함하는 발전기 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 23850277 Country of ref document: EP Kind code of ref document: A1 |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 18841493 Country of ref document: US |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 112023001978 Country of ref document: DE |
|
| WWP | Wipo information: published in national office |
Ref document number: 112023001978 Country of ref document: DE |
|
| WWP | Wipo information: published in national office |
Ref document number: 18841493 Country of ref document: US |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 23850277 Country of ref document: EP Kind code of ref document: A1 |


