WO2020145538A1 - 모터 - Google Patents

모터 Download PDF

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Publication number
WO2020145538A1
WO2020145538A1 PCT/KR2019/017930 KR2019017930W WO2020145538A1 WO 2020145538 A1 WO2020145538 A1 WO 2020145538A1 KR 2019017930 W KR2019017930 W KR 2019017930W WO 2020145538 A1 WO2020145538 A1 WO 2020145538A1
Authority
WO
WIPO (PCT)
Prior art keywords
angle
groove
tooth
motor
shaft
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
Application number
PCT/KR2019/017930
Other languages
English (en)
French (fr)
Korean (ko)
Inventor
편진수
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Innotek Co Ltd
Original Assignee
LG Innotek Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LG Innotek Co Ltd filed Critical LG Innotek Co Ltd
Priority to US17/420,105 priority Critical patent/US20220060067A1/en
Priority to CN201980088480.2A priority patent/CN113273054B/zh
Priority to EP19909546.4A priority patent/EP3910758A4/en
Priority to JP2021538329A priority patent/JP2022516269A/ja
Publication of WO2020145538A1 publication Critical patent/WO2020145538A1/ko
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H02K1/14—Stator 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • 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
    • 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
    • H02K1/278—Surface mounted magnets; Inset magnets
    • 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
    • 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
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • 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 embodiment relates to a motor.
  • a motor is a device that converts electrical energy into mechanical energy to obtain rotational force, and is widely used in vehicles, home electronics, and industrial equipment.
  • the electronic power steering system (hereinafter referred to as EPS), in which the motor is used, drives the motor in an electronic control unit according to the operating conditions to ensure turning stability and provides quick resilience. do. Accordingly, the driver of the vehicle can drive safely.
  • the motor includes a stator and a rotor.
  • the stator may include teeth forming a plurality of slots, and the rotor may include a plurality of magnets facing the teeth.
  • the teeth which are disposed adjacent to each other, are disposed apart from each other to form a slot open.
  • cogging torque may occur due to a difference in permeability between the stator made of metal and the air in the slot opening, which is an empty space. Since this cogging torque causes noise and vibration, reducing the cogging torque is most important to improve the motor quality.
  • a hole is formed in a cover disposed to cover the opening of the housing, and a sensor is disposed inside the hole to secure a predetermined distance between the sensor and the sensing magnet, thereby ensuring sensing performance and reducing axial size.
  • a motor that can do it.
  • the embodiment provides a motor capable of securing rigidity while preventing the formation of a gap between the caps regardless of the assembly tolerance by implementing an elastic structure capable of elastically supporting the rotor core on the cap formed with a predetermined thickness.
  • the shaft A rotor to which the shaft is coupled; And a stator disposed outside the rotor, the stator including a stator core and a coil wound around the stator core, wherein the stator core is formed on a yoke, a tooth formed protruding from the yoke, and an inner surface of the tooth.
  • the formed first groove and the second groove, and the distance between the first groove and the second groove based on the center of the circumferential direction of the tooth is achieved by different motors.
  • the separation distance from the center of the circumferential direction of the tooth to the first groove may be different from the separation distance from the center of the circumferential direction of the tooth to the second groove.
  • the first angle ( ⁇ 1) formed by the inner surface of the tooth from the virtual line (L) connecting the center of the inner surface of the tooth and the shaft of the shaft to one side of the first groove and the The second angle ⁇ 2 formed by the inner surface of the tooth from the line L to the other side of the second groove may be different from each other.
  • first groove and the second groove may be formed in the axial direction of the shaft.
  • the fourth angle ⁇ 4 formed by the inner surface of the tooth from one side of the inner surface of the tooth to one side of the second groove based on the axis of the shaft may be twice the second angle ⁇ 2.
  • the second distance D2 from the virtual line L connecting the center of the inner surface of the tooth and the shaft of the shaft to the other side of the second groove is 1.578 times the depth D of the second groove, ,
  • the difference between the first angle ⁇ 1 and the second angle ⁇ 2 may be within 10% of the size of the second angle ⁇ 2.
  • the first angle ⁇ 1 is the sum of angles within 10% of the second angle ⁇ 2 and the second angle ⁇ 2, or the first angle ⁇ 1 is the second angle ⁇ 2 And an angle within 5% of the second angle ⁇ 2.
  • the second distance D2 from the virtual line L connecting the center of the inner surface of the tooth and the shaft of the shaft to the other side of the second groove is 1.315 times the depth D of the second groove, ,
  • the difference between the first angle ⁇ 1 and the second angle ⁇ 2 may be within 5% of the size of the second angle ⁇ 2.
  • the first angle ⁇ 1 is the sum of angles within 4% of the second angle ⁇ 2 and the second angle ⁇ 2, or the first angle ⁇ 1 is the second angle ⁇ 2 And an angle within 5% of the second angle ⁇ 2.
  • the shaft A rotor to which the shaft is coupled; And a stator disposed outside the rotor, the stator including a stator core and a coil wound around the stator core, wherein the stator core is formed on a yoke, a tooth formed protruding from the yoke, and an inner surface of the tooth.
  • a fifth angle ( ⁇ 5) formed by the inner surface of the tooth from one side of the first groove to the other side of the second groove, including the formed first groove and the second groove, based on the axis of the shaft is the first
  • the third angle ⁇ 3 formed by the inner surface of the tooth from the other side of the groove to the other side of the tooth, and the fourth angle ⁇ 4 formed by the inner surface of the tooth from one side of the second groove to one side of the inner surface of the tooth And is achieved by a motor with a different angle.
  • the third angle ⁇ 3 and the fourth angle ⁇ 4 may be different from each other.
  • the fifth angle ⁇ 5 may be larger or smaller than the fourth angle ⁇ 4.
  • the fourth angle ⁇ 4 when the fifth angle ⁇ 5 is greater than the fourth angle ⁇ 4, the fourth angle ⁇ 4 is greater than the third angle ⁇ 3, and the fifth angle ⁇ 5 is the first When it is smaller than 4 degrees ⁇ 4, the fourth angle ⁇ 4 may be smaller than the third angle ⁇ 3.
  • the fifth angle ⁇ 5 is the first angle ⁇ 1 formed by the inner surface of the tooth from the virtual line L connecting the center of the inner surface of the tooth and the shaft of the shaft to one side of the first groove. It may be the sum of the second angle ⁇ 2 formed by the inner surface of the tooth from the line L to the other side of the second groove.
  • first angle ⁇ 1 and the second angle ⁇ 2 may be different from each other.
  • the second distance D2 from the virtual line L connecting the center of the inner surface of the tooth and the shaft of the shaft to the other side of the second groove is 1.578 times the depth D of the second groove
  • the fourth angle ⁇ 4 is the sum of the third angle ⁇ 3 and an angle within 10% of the second angle ⁇ 2, or the fourth angle ⁇ 4 is the third angle ⁇ 3
  • the difference may be an angle within 5% of the second angle ⁇ 2.
  • the second distance D2 from the virtual line L connecting the center of the inner surface of the tooth and the shaft of the shaft to the other side of the second groove is 1.315 times the depth D of the second groove
  • the fourth angle ⁇ 4 is the sum of the third angle ⁇ 3 and an angle within 4% of the second angle ⁇ 2, or the fourth angle ⁇ 4 is the third angle ⁇ 3
  • the difference may be an angle within 5% of the second angle ⁇ 2.
  • the second distance D2 from the virtual line L connecting the center of the inner surface of the tooth and the shaft of the shaft to the other side of the second groove is 1.578 times the depth D of the second groove, ,
  • the difference between the fourth angle ⁇ 4 and the third angle ⁇ 3 may be within 5% of the size of the fourth angle ⁇ 4.
  • the second distance D2 from the virtual line L connecting the center of the inner surface of the tooth and the shaft of the shaft to the other side of the second groove is 1.315 times the depth D of the second groove, ,
  • the difference between the fourth angle ⁇ 4 and the third angle ⁇ 3 may be within 2.5% of the size of the fourth angle ⁇ 4.
  • the sizes of the first groove and the second groove may be the same.
  • the ratio of the depth D to the width W of the circumferential direction of the first groove may be 0.24 to 0.29.
  • the inner surface may be formed with a predetermined curvature (1/R) based on the axis of the motor.
  • the rotor may have eight magnets, and the stator may have twelve teeth.
  • the second distance (D2) from the virtual line (L) connecting the center of the inner surface of the tooth and the shaft of the shaft to the other side of the second groove is 1.315 to 1.9725 of the depth (D) of the second groove It can be a ship.
  • the motor according to the embodiment having the above-described configuration may reduce cogging torque through a design for a groove disposed asymmetrically based on the center of the tooth. Accordingly, the quality of the motor can be improved.
  • the motor may reduce cogging torque through a positional relationship of at least two grooves arranged asymmetrically. At this time, the motor can provide a design criterion for cogging torque by defining the depth of the groove in relation to the separation distance of the grooves arranged away from the center of the tooth.
  • FIG. 1 is a view showing a motor according to an embodiment
  • FIG. 2 is a cross-sectional view showing a motor according to an embodiment
  • FIG. 3 is a view showing a stator core of a motor according to an embodiment
  • FIG. 4 is an enlarged view showing area A of FIG. 3,
  • FIG. 5 is a view showing a unit stator core of a motor according to an embodiment
  • FIG. 8 is a view showing a cogging torque waveform of a motor as a comparative example
  • FIG. 9 is a view showing the waveform of the cogging torque of the motor when the second distance of the second groove is 1.578 times the depth of the second groove of the motor according to the embodiment,
  • 11 is a graph showing the cogging torque of the motor when the second distance of the second groove is 1.315 times the depth of the second groove of the motor according to the embodiment,
  • FIG. 12 is a view showing a cogging torque waveform of a motor as a comparative example
  • FIG. 13 is a diagram showing a cogging torque waveform of a motor when the second distance of the second groove is 1.315 times the depth of the second groove of the motor according to the embodiment,
  • 15 is a graph showing the cogging torque of the motor when the second distance of the second groove is 1.9725 times the depth of the second groove of the motor according to the embodiment,
  • 16 is a diagram showing a cogging torque waveform of a motor as a comparative example
  • FIG. 17 is a diagram showing a cogging torque waveform of a motor when the second distance of the second groove is 1.9725 times the depth of the second groove of the motor according to the embodiment.
  • a singular form may also include a plural form unless specifically stated in the phrase, and is combined with A, B, and C when described as "at least one (or more than one) of A and B, C". It can contain one or more of all possible combinations.
  • first, second, A, B, (a), and (b) may be used.
  • a component when a component is described as being'connected','coupled' or'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also to the component It may also include the case of'connected','coupled' or'connected' by another component between the other components.
  • top (top) or bottom (bottom) when described as being formed or disposed in the “top (top) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is one as well as when the two components are in direct contact with each other It also includes a case in which another component described above is formed or disposed between two components.
  • up (up) or down (down) when expressed as “up (up) or down (down)", it may include the meaning of the downward direction as well as the upward direction based on one component.
  • FIG. 1 is a view showing a motor according to an embodiment
  • FIG. 2 is a cross-sectional view showing a motor according to an embodiment.
  • FIG. 2 is a cross-sectional view showing line A-A in FIG. 1.
  • the y direction means an axial direction
  • the x direction may mean a radial direction.
  • the axial direction and the radial direction may be perpendicular to each other.
  • the axial direction may be the longitudinal direction of the shaft 500.
  • the motor 1 includes a housing 100 having an opening formed on one side, a cover 200 disposed on the top of the housing 100, and an interior of the housing 100
  • the stator 300, the rotor 400 disposed inside the stator 300, and the shaft 500 rotating together with the rotor 400, the bus bar 600 disposed on the upper side of the stator 300, and the shaft ( 500) may include a sensor unit 700 for sensing rotation.
  • the inner side means a direction disposed toward the central axis C based on the radial direction
  • the outer side means a direction opposite to the inner side.
  • the housing 100 and the cover 200 may form the outer shape of the motor 1.
  • the housing 100 may be formed in a cylindrical shape with an opening on the top.
  • the cover 200 may be disposed to cover the open top of the housing 100.
  • an accommodation space may be formed inside by combining the housing 100 and the cover 200.
  • the stator 300, the rotor 400, the shaft 500, the bus bar 600 and the sensor unit 700 may be disposed in the accommodation space.
  • the housing 100 may be formed in a cylindrical shape.
  • a pocket portion accommodating the bearing 10 supporting the lower portion of the shaft 500 may be provided under the housing 100.
  • a pocket portion accommodating the bearing 10 supporting the upper portion of the shaft 500 may also be provided on the cover 200 disposed on the upper portion of the housing 100.
  • the stator 300 may be supported by the inner circumferential surface of the housing 100.
  • the stator 300 may be disposed outside the rotor 400. That is, the rotor 400 may be disposed inside the stator 300.
  • the stator 300 includes a stator core 310, a coil 320 wound around the stator core 310, and an insulator 330 disposed between the stator core 310 and the coil 320. It may include.
  • a coil 320 forming a rotating magnetic field may be wound on the stator core 310.
  • the stator core 310 may be formed of one core.
  • the stator core 310 may be formed by arranging a plurality of unit stator cores 310a illustrated in FIG. 5 along a circumferential direction.
  • stator core 310 may be formed in a form in which a plurality of plates in the form of thin steel plates are stacked with each other, but is not limited thereto.
  • the stator core 310 may be formed as a single unit.
  • the stator core 310 includes a first groove 314 and a second groove 315 formed in the yoke 311, the teeth 312 protruding in the radial direction from the yoke 311, and the inner surface 313 of the tooth 312. It may include.
  • the separation distance to the first groove 314 and the separation distance to the second groove 315 based on the center of the circumferential direction of the tooth 312 may be different from each other. Accordingly, the first groove 314 and the second groove 315 may be arranged asymmetrically on the inner surface 313 of the tooth 312.
  • the yoke 311 of the stator core 310 may be formed in a cylindrical shape.
  • the yoke 311 of the unit stator core 310a may be formed in an arc shape.
  • the tooth 312 may be disposed to protrude from the yoke 311 toward the radial direction (x direction) with respect to the axis C.
  • the plurality of teeth 312 may be disposed to be spaced apart from each other on the inner circumferential surface of the yoke 311 of the stator core 310 along the circumferential direction. Accordingly, a slot in which the coil 320 can be wound may be formed between each of the teeth 312.
  • the tooth 312 may be provided in 12 pieces, but is not limited thereto.
  • the tooth 312 may be disposed to face the magnet 420 of the rotor 400.
  • the inner surface 313 of the tooth 312 based on the radial direction is disposed to be spaced apart at a predetermined distance from the outer circumferential surface of the magnet 420.
  • the inner surface 313 may be formed with a predetermined curvature (1/R) based on the axis (C) of the motor (1). Accordingly, the length of the inner surface 313 of the tooth 312 may be obtained by a formula for obtaining the length of the arc.
  • a coil 320 is wound around each tooth 312.
  • the tooth 312 may include a body 312a on which the coil 320 is wound and a protrusion 312b disposed on an inner end of the body 312a.
  • the protrusion 312b may be called a shoe.
  • the body 312a may be disposed to protrude from the yoke 311 toward the radial direction (x direction) with respect to the axis C. Further, the bodies 312a may be disposed to be spaced apart from each other on the inner circumferential surface of the yoke 311 along the circumferential direction.
  • the coil 320 may be wound on the body 312a.
  • the protrusion 312b may extend to protrude inward from the end of the body 312a. At this time, the circumferential width of the protrusion 312b may be larger than the circumferential width of the body 312a.
  • an opening may be formed inside the slot.
  • the opening means opening a slot.
  • the slot open may indicate between one end of the protrusion 312b of one tooth 312 of the plurality of teeth 312 and the other end of the protrusion 312b of the other tooth 312 adjacent thereto.
  • the slot open may mean a space between the end point P of one of the protrusions 312b and the end point P of the other protrusion 312b disposed adjacent to the slot open. It can be arranged to have a distance.
  • the distance of the slot open may be referred to as a distance between the protrusions 312b or a width of the slot open.
  • the inner surface 313 is the first inner surface 313a, the second inner surface 313b and the first 3 may include an inner surface 313c.
  • the first groove 314 and the second groove 315 may be formed concave in the radial direction on the inner surface 313.
  • the first groove 314 and the second groove 315 may be disposed on the inner surface 313 spaced apart from each other in the circumferential direction.
  • the first groove 314 and the second groove 315 may be formed to be long from the top to the bottom of the inner surface 313 in the axial direction of the shaft 500.
  • the separation distances between the first groove 314 and the second groove 315 are different from each other based on a virtual line L connecting the circumferential center of the tooth 312 and the axis C. can do.
  • the center of the circumferential direction of the tooth 312 may be the center C1 of the inner surface 313. Accordingly, the center C1 of the inner surface 313 may be disposed on the line L.
  • One distance D1 may be different from the second distance D2 from the line L to the other side of the second groove 315.
  • the first distance D1 may be greater or less than the second distance D2.
  • the arrangement positions of the first groove 314 and the second groove 315 may be asymmetrical based on the circumferential center of the tooth 312.
  • the tooth ( The second angle ⁇ 2 formed by the inner surface 313 of 312 may be different from each other.
  • the clockwise side may be referred to as one side and the counterclockwise side as the other side based on the circumferential direction.
  • the first angle ⁇ 1 may be an angle indicating a distance to one side of the first groove 314 based on the line L
  • the second angle ⁇ 2 may be the line L It may be an angle indicating the distance to the other side of the second groove 315 as a reference.
  • the shaft C of the shaft 500 may be the same as the center of the stator core 310.
  • the inner surface 313 representing the first angle ⁇ 1 and the second angle ⁇ 2 may be the second inner surface 313b.
  • the fifth angle ⁇ 5 formed by the inner surface 313 of the tooth 312 from one side of the first groove 314 to the other side of the second groove 315 based on the axis of the shaft 500 ) Is a third angle ( ⁇ 3) formed by the inner surface 313 of the tooth 312 from the other side of the first groove 314 to the other side of the tooth 312 and one side of the second groove 315.
  • a fourth angle ⁇ 4 formed by the inner surface 313 of the tooth 312 to one side of the inner surface 313 of the tooth 312 may be formed at a different angle.
  • the fourth angle ⁇ 4 formed by the inner surface 313 of the tooth 312 from one side of the inner surface 313 of the tooth 312 to one side of the second groove 315 is the second angle ⁇ 2 ).
  • the fifth angle ⁇ 5 may be an angle formed by one side and the other side with respect to the circumferential direction of the second inner surface 313b based on the axis C.
  • the fifth angle ⁇ 5 may represent the first angle ⁇ 1 and the second angle ⁇ 2.
  • the fifth angle ⁇ 5 is the first groove in the virtual line L connecting the center C1 of the inner surface 313 of the tooth 312 and the axis C of the shaft 500.
  • the first angle ⁇ 1 formed by the inner surface 313 of the tooth 312 to one side of 314 and the inner surface 313 of the tooth 312 from the line L to the other side of the second groove 315 ) May be the sum of the second angles ⁇ 2.
  • the first angle ⁇ 1 and the second angle ⁇ 2 may be different from each other.
  • the third angle ⁇ 3 may be an angle formed by one side and the other side with respect to the circumferential direction of the first inner surface 313a based on the axis C.
  • the fourth angle ⁇ 4 may be an angle formed by one side and the other side with respect to the circumferential direction of the third inner surface 313c based on the axis C.
  • the third angle ⁇ 3 and the fourth angle ⁇ 4 may be different from each other.
  • a first distance D1 which is a separation distance from which the first groove 314 is separated from the line L
  • a second distance D2 which is a separation distance from which the second groove 315 is separated from the line L
  • the fifth angle ⁇ 5 may be greater or less than the fourth angle ⁇ 4.
  • the fourth angle ⁇ 4 may be greater than the third angle ⁇ 3.
  • the fourth angle ⁇ 4 may be smaller than the third angle ⁇ 3.
  • the third distance D3 from the other side of the inner surface 313 of the tooth 312 to the first groove 314 is the second groove 315 at one side of the inner surface 313 of the tooth 312. It is different from the fourth distance D4 to ).
  • the sizes of the first groove 314 and the second groove 315 may be the same.
  • the depth D and the width W in the circumferential direction of each of the first groove 314 and the second groove 315 may be the same, and may be formed to have a rectangular horizontal cross section.
  • the ratio of the depth D to the width W in the circumferential direction of the first groove 314 may be 0.24 to 0.29. have. That is, the depth D of the first groove 314 may be 0.24 to 0.29 times the width W of the first groove 314.
  • the second distance D2 may be 1.315 to 1.9725 times the depth D of the second groove 315.
  • the second distance D2 may be 1.315 to 1.578 times the depth D of the second groove 315.
  • the first groove 314 and the second groove 315 of the motor 1 may be formed on the inner surface 313 of the tooth 312 to be asymmetric with respect to the line L, and the line L
  • the cogging torque may be reduced by the spaced first distance D1 of the first groove 314 based on.
  • the motor (1) is based on the line (L), the first distance (D1) that is the separation distance of the first groove (314) and the second distance (D2) that is the separation distance of the second groove (315) It can be designed differently to reduce cogging torque.
  • the fourth distance D4 from one side of the inner surface 313 of the tooth 312 to the second groove 315 may be twice the second distance D2.
  • the first angle ⁇ 1 may be different from the second angle ⁇ 2.
  • the motor 1 may reduce the cogging torque by providing the second angle ⁇ 2 as a design reference value and forming the first angle ⁇ 1 differently based on the second reference angle ⁇ 2.
  • the fourth angle ⁇ 4 may be twice the second angle ⁇ 2.
  • the motor 1 is grooved in relation to the second distance D2 or the second angle ⁇ 2 of the second groove 315 disposed away from the center C1 of the inner surface 313 of the tooth 312. It is possible to reduce the cogging torque of the motor 1 by setting the placement distance of the first distance D1 or the first angle ⁇ 1 based on the depth D of.
  • FIG. 6 is a table showing a change in cogging torque and torque of the motor when the second distance of the second groove is 1.578 times the depth of the second groove of the motor according to the embodiment
  • FIG. 7 is the second of the motor according to the embodiment
  • it is a graph showing the cogging torque of the motor
  • FIG. 8 is a diagram showing the waveform of the cogging torque of the motor as a comparative example
  • FIG. When the second distance of the second groove to the depth of the groove is 1.578 times, this is a diagram showing the cogging torque waveform of the motor when the first angle is 2.4 deg.
  • the motor presented as a comparative example represents a case where the first angle ⁇ 2 of the first groove 314 and the second angle ⁇ 2 of the second groove 315 are the same.
  • the second distance D2 of the second groove 315 may be 1.578 times the depth D of the second groove 315.
  • the depth D of the second groove 315 may be 0.5 mm.
  • the depth of the first groove 314 is the same as the depth of the second groove 315.
  • the first angle ⁇ 1 of the motor 1 may be formed to be larger or smaller than the second angle ⁇ 2.
  • the difference between the first angle ⁇ 1 and the second angle ⁇ 2 may be within 10% of the size of the second angle ⁇ 2.
  • the first distance D1 of the motor 1 may be formed to be larger or smaller than the second distance D2.
  • the cogging torque of the motor 1 decreases until the first angle ⁇ 1 is 2.4deg and then increases again.
  • the first angle ⁇ 1 is smaller than the second angle ⁇ 2
  • the cogging torque of the motor 1 decreases until the first angle ⁇ 1 is 2.1deg and then increases again. have.
  • the amount of change in the torque of the motor 1 according to the embodiment is insignificant compared to the torque result value of the comparative example motor of 6.01 Nm.
  • the cogging torque of the motor 1 has a minimum value.
  • the cogging torque of the motor 1 has a second small value.
  • the amplitudes of the maximum and minimum values of the cogging torque of the motor 1 are smaller than the widths of the maximum and minimum values of the cogging torque of the comparative example motor. Can be confirmed. Accordingly, it can be seen that the cogging torque of the motor 1 is reduced.
  • FIG. 10 is a table showing a change in the cogging torque and torque of the motor when the second distance of the second groove is 1.315 times the depth of the second groove of the motor according to the embodiment
  • FIG. 11 is the second of the motor according to the embodiment
  • it is a graph showing the cogging torque of the motor
  • FIG. 12 is a diagram showing the waveform of the cogging torque of the motor as a comparative example
  • FIG. It is a diagram showing the cogging torque waveform of the motor when the first angle is 2.3 deg when the second distance of the second groove to the depth of the groove is 1.315 times.
  • the motor presented as a comparative example represents a case where the first angle ⁇ 2 of the first groove 314 and the second angle ⁇ 2 of the second groove 315 are the same.
  • the second distance D2 of the second groove 315 may be 1.315 times the depth D of the second groove 315.
  • the depth D of the second groove 315 may be 0.6 mm.
  • the depth of the first groove 314 is the same as the depth of the second groove 315.
  • the first angle ⁇ 1 of the motor 1 may be formed to be larger or smaller than the second angle ⁇ 2.
  • the difference between the first angle ⁇ 1 and the second angle ⁇ 2 may be within 5% of the size of the second angle ⁇ 2.
  • the difference between the fourth angle ⁇ 4 and the third angle ⁇ 3 may be within 2.5% of the size of the fourth angle ⁇ 4.
  • the first distance D1 of the motor 1 may be formed to be larger or smaller than the second distance D2.
  • the cogging torque of the motor 1 has a minimum value.
  • the cogging torque of the motor 1 has a second small value.
  • the amplitudes of the maximum and minimum values of the cogging torque of the motor 1 are smaller than the widths of the maximum and minimum values of the cogging torque of the comparative example motor. Can be confirmed. Accordingly, it can be seen that the cogging torque of the motor 1 is reduced.
  • FIG. 14 is a table showing changes in cogging torque and torque of a motor when the second distance of the second groove is 1.9725 times compared to the depth of the second groove of the motor according to the embodiment
  • FIG. 15 is a second view of the motor according to the embodiment
  • the second distance of the second groove to the depth of the groove is 1.9725 times
  • it is a graph showing the cogging torque of the motor
  • FIG. 16 is a diagram showing the waveform of the cogging torque of the motor as a comparative example
  • FIG. When the second distance of the second groove to the depth of the groove is 1.9725 times, this is a diagram showing the waveform of the motor's cogging torque when the first angle is 2.4 deg.
  • the motor presented as a comparative example represents a case where the first angle ⁇ 2 of the first groove 314 and the second angle ⁇ 2 of the second groove 315 are the same.
  • the second distance D2 of the second groove 315 may be 1.9725 times the depth D of the second groove 315.
  • the depth D of the second groove 315 may be 0.6 mm.
  • the depth of the first groove 314 is the same as the depth of the second groove 315.
  • the first angle ⁇ 1 of the motor 1 may be formed to be larger or smaller than the second angle ⁇ 2.
  • a difference between the first angle ⁇ 1 and the second angle ⁇ 2 may be within 10% of the size of the second angle ⁇ 2.
  • the first distance D1 of the motor 1 may be formed to be larger or smaller than the second distance D2.
  • the cogging torque of the motor 1 has a minimum value.
  • the amplitudes of the maximum and minimum values of the cogging torque of the motor 1 are smaller than the widths of the maximum and minimum values of the cogging torque of the comparative example motor. Can be confirmed. Accordingly, it can be seen that the cogging torque of the motor 1 is reduced.
  • the insulator 330 insulates the stator core 310 and the coil 320. Accordingly, the insulator 330 may be disposed between the stator core 310 and the coil 320.
  • the coil 320 may be wound on the tooth 312 of the stator core 310 on which the insulator 330 is disposed.
  • the rotor 400 may be disposed inside the stator 300.
  • the rotor 400 may include a hole in which the shaft 500 is inserted in the center. Accordingly, the shaft 500 may be coupled to the hole of the rotor 400.
  • the rotor 400 may include a rotor core 410 and a magnet 420 disposed on an outer circumferential surface of the rotor core 410.
  • the magnet 420 may be provided in eight, but is not necessarily limited thereto.
  • the rotor 400 may be implemented in a type in which the magnet 420 is coupled to the outer circumferential surface of the rotor core 410.
  • a separate can member (not shown) may be coupled to the rotor core 410 to prevent separation of the magnet 420 and increase bonding force.
  • the magnet 420 and the rotor core 410 may be integrally formed by double injection.
  • the rotor 400 may be implemented as a type in which the magnet 420 is coupled to the interior of the rotor core 410.
  • the rotor 400 of this type may be provided with a pocket into which the magnet 420 is inserted into the rotor core 410.
  • the rotor core 410 may be formed by stacking a plurality of plates in the form of thin steel plates. Of course, the rotor core 410 may be manufactured in the form of a single core composed of a single cylinder.
  • the rotor core 410 may be formed in a form in which a plurality of pucks (unit cores) forming a skew angle are stacked.
  • the rotor core 410 may include a hole formed to insert the shaft 500.
  • the shaft 500 may be coupled to the rotor 400.
  • the rotor 400 rotates and the shaft 500 rotates in cooperation with the rotor 400.
  • the shaft 500 may be supported by the bearing 10.
  • the shaft 500 may be rotatably supported inside the housing 100 and the cover 200 by the bearing 10, as shown in FIG. 1.
  • the shaft 500 may be connected to the steering shaft of the vehicle. Accordingly, the steering shaft may receive power by rotation of the shaft 500.
  • the bus bar 600 may be disposed above the stator 300.
  • bus bar 600 may be electrically connected to the coil 320 of the stator 300.
  • the bus bar body may be a ring-shaped mold formed through injection molding.
  • the terminal may be disposed on the busbar body through insert injection molding.
  • the terminal may be electrically connected to the coil 320 of the stator 300.
  • the sensor unit 700 may sense the magnetic force of the sensing magnet installed so as to be interlocked with the rotor 400 to determine the current position of the rotor 400. Accordingly, the sensor unit 700 may sense the rotation of the shaft 500.
  • the sensor unit 700 may include a sensing magnet assembly 710 and a printed circuit board (PCB, 720).
  • PCB printed circuit board
  • the sensing magnet assembly 710 is coupled to the shaft 500 to interlock with the rotor 400 to detect the position of the rotor 400.
  • the sensing magnet assembly 710 may include a sensing magnet and a sensing plate.
  • the sensing magnet and the sensing plate may be coupled to have a coaxial.
  • the sensing magnet may include a main magnet disposed in a circumferential direction adjacent to a hole forming an inner circumferential surface and a sub magnet formed at an edge of the main magnet.
  • the main magnet may be arranged in the same manner as the drive magnet inserted into the rotor 400 of the motor.
  • the sub-magnet may be subdivided from the main magnet to have many poles. Accordingly, it is possible to further divide and measure the rotation angle, thereby making the motor drive smoother.
  • the sensing plate may be formed of a disc-shaped metal material.
  • a sensing magnet may be coupled to the upper surface of the sensing plate.
  • the sensing plate may be coupled to the shaft 500.
  • a hole through which the shaft 500 passes may be formed in the sensing plate.
  • a sensor sensing the magnetic force of the sensing magnet may be disposed on the printed circuit board 720.
  • the sensor may be provided as a Hall IC.
  • the sensor may generate a sensing signal by sensing changes in the N and S poles of the sensing magnet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
PCT/KR2019/017930 2019-01-08 2019-12-18 모터 Ceased WO2020145538A1 (ko)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US17/420,105 US20220060067A1 (en) 2019-01-08 2019-12-18 Motor
CN201980088480.2A CN113273054B (zh) 2019-01-08 2019-12-18 马达
EP19909546.4A EP3910758A4 (en) 2019-01-08 2019-12-18 ENGINE
JP2021538329A JP2022516269A (ja) 2019-01-08 2019-12-18 モータ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020190002261A KR20200086087A (ko) 2019-01-08 2019-01-08 모터
KR10-2019-0002261 2019-01-08

Publications (1)

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WO2020145538A1 true WO2020145538A1 (ko) 2020-07-16

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EP (1) EP3910758A4 (https=)
JP (1) JP2022516269A (https=)
KR (1) KR20200086087A (https=)
CN (1) CN113273054B (https=)
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JP2023167207A (ja) * 2022-05-11 2023-11-24 ニデック株式会社 単相モータおよび扇風機
CN115021434B (zh) * 2022-06-09 2025-08-15 珠海格力电器股份有限公司 定子铁芯、电机、汽车
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JP2022516269A (ja) 2022-02-25
KR20200086087A (ko) 2020-07-16
EP3910758A1 (en) 2021-11-17
EP3910758A4 (en) 2022-03-23
CN113273054A (zh) 2021-08-17
US20220060067A1 (en) 2022-02-24
CN113273054B (zh) 2024-02-13

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