WO2020067274A1 - Moteur - Google Patents

Moteur Download PDF

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Publication number
WO2020067274A1
WO2020067274A1 PCT/JP2019/037826 JP2019037826W WO2020067274A1 WO 2020067274 A1 WO2020067274 A1 WO 2020067274A1 JP 2019037826 W JP2019037826 W JP 2019037826W WO 2020067274 A1 WO2020067274 A1 WO 2020067274A1
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WO
WIPO (PCT)
Prior art keywords
rotor
magnet
pole
central axis
magnetic flux
Prior art date
Application number
PCT/JP2019/037826
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English (en)
Japanese (ja)
Inventor
莉奈 丸山
太郎 旦野
誠二 小島
敏 木戸間
Original Assignee
日本電産サーボ株式会社
株式会社小糸製作所
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 日本電産サーボ株式会社, 株式会社小糸製作所 filed Critical 日本電産サーボ株式会社
Priority to CN201980060211.5A priority Critical patent/CN112689944A/zh
Publication of WO2020067274A1 publication Critical patent/WO2020067274A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors

Definitions

  • the present invention relates to a motor.
  • Priority is claimed on Japanese Patent Application No. 2018-183961 filed on September 28, 2018, the content of which is incorporated herein by reference.
  • Patent Literature 1 discloses a technique of performing rotation control in an outer rotor type brushless DC motor by using an FG signal relating to the rotation speed of a rotor.
  • magnetism from a magnet provided on a rotor is detected by a sensor, and an FG signal is generated based on the detection result.
  • the rotor is constructed by attaching a magnet to the inner periphery of the rotor core.
  • the magnet having a displacement with respect to the rotor core is eccentric when the rotor rotates. Since the position of the magnet rotating in the eccentric state with respect to the sensor varies in the radial direction, the rotation accuracy of the rotor is good, but only the rotation accuracy of the FG signal is deteriorated.
  • an object of the present invention is to provide a motor that can reduce deterioration of the rotation accuracy of an FG signal even when eccentricity occurs during rotation of a rotor.
  • One aspect of the motor of the present invention is a rotor having a covered cylindrical rotor core having a shaft extending along a central axis, a hollow cylindrical magnet provided on an inner peripheral side of the rotor core, and a rotor having the magnet.
  • a detection element that detects a magnetic flux density; and a signal output unit that outputs a signal related to a rotation speed of the rotor based on the magnetic flux density.
  • the magnet has a first pole and a second pole along a circumferential direction.
  • the first pole and the second pole which are arranged alternately and line up in the rotation direction from the rear in the rotation direction to the first magnetization boundary of the first pole and the second pole, and A first magnetized boundary including a second magnetized boundary of the first pole and a center axis of the magnet passing through the center of the magnet when viewed in a plan view from a direction along the central axis. It is located on a straight line passing through and.
  • a motor capable of reducing deterioration of rotation accuracy of an FG signal even when eccentricity occurs during rotation of a rotor.
  • FIG. 4 is a diagram illustrating a relationship between a magnetic flux density and an FG signal.
  • FIG. 4 is a diagram illustrating a positional relationship between a detection element and a magnet in a rotor without eccentricity. It is a top view of a 1st rotor. It is a top view of a 2nd rotor. It is a top view of a 3rd rotor.
  • FIG. 9 is a diagram illustrating a change in a positional relationship between a magnet and a detection element when a third rotor rotates. It is a figure explaining a shake detection process. It is a figure explaining a marking process. It is a figure explaining a magnetization process. It is a figure showing appearance of a motor. It is a horizontal sectional view of a vehicle headlamp.
  • the motor according to the present embodiment relates to a motor used to drive a rotary reflector that forms a light distribution pattern incorporated in a vehicle headlamp.
  • FIG. 1 is a cross-sectional view of the motor according to the present embodiment.
  • the motor of the present embodiment is an outer rotor type motor.
  • the motor 10 of the present embodiment includes a stator 1, a rotor 2, a bearing 3, a circuit board 4, and a detection element 5.
  • the motor 10 of the present embodiment is an outer rotor type motor in which a rotor 2 is arranged on an outer peripheral side of a stator 1.
  • the stator 1 has a substantially cylindrical bearing holding portion 1a centered on the central axis J, a stator core 1b mounted radially outside the bearing holding portion 1a, and a coil 1c mounted on the stator core 1b.
  • the bearing holding part 1a supports two bearings 3 which are part of the bearing mechanism in the axial direction.
  • the stator core 1b is formed as a laminated body in which a plurality of plate-like bodies are laminated.
  • a plurality of teeth as respective magnetic poles are arranged at predetermined intervals in a circumferential direction on an outer peripheral portion of the stator core 1b.
  • a coil 1c is wound around an arm constituting a magnetic circuit inside each tooth via an insulator (not shown).
  • the stator 1 in which the coil 1c is wound around the stator core 1b is configured.
  • the rotor 2 is rotatably supported on the stator 1 about the central axis J via the bearing 3.
  • the rotor 2 is a substantially cylindrical metal rotor core 8 having a center axis J as a center and made of a magnetic material.
  • the rotor 2 is provided inside the sidewall of the rotor core 8 (that is, on the inner peripheral side), and the coil of the stator 1 is provided.
  • the magnet 6 includes a magnet 6 arranged to face the first core 1c and a shaft 9 extending from the rotor core 8 along the central axis J.
  • the center of the shaft 9 coincides with the central axis J.
  • the shaft 9 may be made of the same member as the rotor core 8, or may be made of a member different from the rotor core 8.
  • a rotating body (not shown) rotated by a motor 10 is attached to the shaft 9.
  • the motor 10 controls rotation of a rotating body attached to the shaft 9.
  • the rotor 2 of the present embodiment is configured by fixing the magnet 6 to the inner peripheral side of the rotor core 8 via the adhesive 7. As a result, in the rotor 2 of the present embodiment, the rotor core 8 and the magnet 6 can be easily fixed, so that the manufacturing process of the rotor 2 is easy.
  • FIG. 2 is a plan view of a magnet constituting the rotor.
  • the magnet 6 has a substantially hollow cylindrical shape extending along the magnet center axis 6C, and S poles (first poles) 6s and N poles (second poles) 6n are alternately arranged along the circumferential direction. They are arranged two by two.
  • the magnet center axis 6C passes through the center of gravity of the magnet 6.
  • a plurality of magnetized boundaries 15 are provided at 90 ° intervals in the circumferential direction.
  • the magnetized boundary portion 15 forms a boundary between the S pole 6s and the N pole 6n.
  • the rotor 2 of the present embodiment forms a four-pole rotor.
  • the rotor 2 of the present embodiment rotates in a rotation direction R that is counterclockwise when viewed in a plan view.
  • the plurality of magnetized boundary portions 15 include a pair of first magnetized boundary portions 16a and 16b and a pair of second magnetized boundary portions 17a and 17b.
  • the first magnetized boundary portions 16a and 16b are magnetized boundaries in which the S pole 6s and the N pole 6n are arranged in a direction opposite to the rotation direction R of the magnet 6.
  • the second magnetized boundary portions 17a and 17b are magnetized boundaries in which the N pole 6n and the S pole 6s are arranged in a direction opposite to the rotation direction R of the magnet 6.
  • the circuit board 4 is held by being inserted into the bearing holding portion 1a of the stator 1.
  • the circuit board 4 has a substantially annular shape, and is electrically connected to a lead (not shown) drawn from the coil 1 c of the stator 1, and controls the rotation of the rotor 2.
  • a lead drawn from the coil 1 c of the stator 1, and controls the rotation of the rotor 2.
  • an integrated circuit and a capacitor are mounted in addition to the detection element 5.
  • the motor 10 of the present embodiment generates a magnetic field from each tooth alternately by supplying an alternating current to the coil 1c, and generates an attractive force and a repulsive force between the magnetic field from each tooth and the magnet 6. Thereby, the rotor 2 rotates around the central axis J.
  • the detection element 5 is provided on the upper surface 4a of the circuit board 4 facing the rotor 2.
  • the detection element 5 is configured by a Hall element such as a Hall IC.
  • the detection element 5 detects the magnetic flux density of the magnet 6 in the rotating rotor 2 and transmits the detection result to the circuit board 4.
  • the circuit board 4 includes an output unit 4b that outputs an FG signal based on the magnetic flux density of the magnet 6.
  • the FG signal is a signal containing a frequency component corresponding to the rotation speed of the rotor 2 and is output from the output unit 4b of the circuit board 4.
  • the FG signal is used for light distribution control in a rotating reflector 124 (see FIG. 9) described later.
  • FIG. 3 is a diagram showing the relationship between the magnetic flux density and the FG signal.
  • the upper part of FIG. 3 shows the magnetic flux density detected by the detecting element 5, the horizontal axis corresponds to the rotation angle of the motor (unit is deg), and the vertical axis corresponds to the magnetic flux density (unit is mT).
  • the lower part of FIG. 3 shows an FG signal output based on the magnetic flux density.
  • the magnetic flux density will be described.
  • the first detection value of the magnetic flux density by the detection element 5 becomes “negative”.
  • the second detection value of the magnetic flux density by the detection element 5 becomes “positive”. Accordingly, the position of the magnetic pole of the magnet 6 with respect to the detection element 5 changes with the rotation of the rotor 2, so that the magnetic flux density is defined by a periodically changing waveform as shown in FIG.
  • the magnetic pole detected by the detection element 5 switches from the S pole 6s to the N pole 6n. That is, when the first magnetized boundary portions 16a and 16b pass through the detection element 5, the magnetic flux density of the detection element 5 changes from the first detection value (negative value) to the second detection value (positive value).
  • the magnetic pole detected by the detection element 5 switches from the N pole 6n to the S pole 6s. That is, when the second magnetized boundary portions 17a and 17b pass through the detection element 5, the magnetic flux density of the detection element 5 changes from the second detection value (positive value) to the first detection value (negative value).
  • the circuit board 4 of the present embodiment generates and outputs the FG signal by the output unit 4b in accordance with the switching timing at which the magnetic flux density transmitted from the detection element 5 changes from the first detection value to the second detection value.
  • the FG signal is generated in accordance with the timing at which the first magnetized boundary portions 16a and 16b pass through the detection element 5.
  • the FG signal falls from “HIGH” to “LOW” at the timing when the first magnetization boundaries 16 a and 16 b pass through the detection element 5, and the timing when the second magnetization boundaries 17 a and 17 b pass through the detection element 5. Is defined by a pulse rising from “LOW” to “HIGH”.
  • the rotor 2 of the present embodiment is configured by fixing the magnet 6 to the inner peripheral side of the rotor core 8 via the adhesive 7 as shown in FIG.
  • the thickness of the adhesive 7 tends to be non-uniform in some places due to a change in volume before and after curing. Therefore, in the rotor 2 of the present embodiment, the magnet 6 is displaced from the rotor core 8.
  • the center axis J of the rotor core 8 and the magnet center axis 6C of the magnet 6 are arranged in different places.
  • the magnet 6 rotates in an eccentric state with respect to the shaft 9 (center axis J) which is the rotation axis of the rotor 2.
  • the rotor 2 that rotates with the magnet 6 eccentric will be referred to as an “eccentric rotor”, and the rotor 2 that rotates in an ideal state where the magnet will not eccentric will be referred to as a “non-eccentric rotor”.
  • the rotor without eccentricity means a state in which the thickness of the adhesive 7 is uniform, and the center axis J of the rotor core 8 and the magnet center axis 6C of the magnet 6 coincide.
  • Such a rotor without eccentricity rotates with the center axis J of the rotor core 8 and the magnet center axis 6C of the magnet 6 aligned.
  • the magnet 6 rotates around the magnet center axis 6C.
  • FIG. 4 is a diagram showing a positional relationship between a detection element and a magnet in a rotor without eccentricity.
  • FIG. 4 shows a change in the positional relationship between the detection element 5 and the magnet 6 when the rotation angle of the rotor 12 without eccentricity changes from 0 ° to 90 ° at a time.
  • the position of the detection element 5 is moved outward in the radial direction of the magnet 6 for the sake of clarity.
  • the rotation angle of the rotor 12 where the first magnetized boundary portion 16a of the magnet 6 is located on a line passing through the detection element 5 and the central axis J (hereinafter referred to as a reference line K) is set to 0 °.
  • the state where the first magnetized boundary portion 16a is located on the reference line K is that the magnetic flux density in the detection element 5 is changed from the first detection value (negative) to the second detection value (positive). ).
  • the positional relationship between the center axis J (magnet center axis 6C) and the detecting element 5 is constant without change during rotation.
  • the magnet 6 is turned on after the first magnetized boundary portion 16 a passes the reference line K after the first magnetized boundary portion 16 a passes the reference line K. Rotate 180 °. Similarly, after the first magnetized boundary portion 16b passes through the reference line K, the magnet 6 rotates 180 ° before the first magnetized boundary portion 16a passes through the reference line K. Therefore, in the rotor 12 without eccentricity, the magnetic flux density in the detecting element 5 switches from “negative: first detected value” to “positive: second detected value” every time the rotor 12 rotates by 180 °.
  • the magnetic flux density changes at a constant cycle (a cycle of half a rotation of the rotor). Therefore, the rotation accuracy of the FG signal output based on the magnetic flux density also increases.
  • the rotation accuracy of the FG signal is high means a state in which the time of one pulse of the FG signal shown in FIG. 3 is constant.
  • the rotor 12 has no eccentricity, it is possible to generate an FG signal with high rotational accuracy.
  • the period of the magnetic flux density fluctuates as described later, so that there is a problem that the rotation accuracy of the FG signal output based on the magnetic flux density is reduced.
  • the present inventors set the eccentric rotor 2 by appropriately setting the positional relationship between the magnet center axis 6C, the center axis J, and the first magnetized boundary portions 16a and 16b.
  • the rotor 2 of the present embodiment was completed. That is, according to the rotor 2 of the present embodiment, as described later, the magnet 6 rotates in an eccentric state, that is, even if the rotor 2 has an eccentricity, it is possible to reduce the deterioration of the rotation accuracy of the FG signal. is there.
  • the first rotor, the second rotor, and the third rotor having different eccentric directions of the magnet center axis 6C with respect to the center axis J will be described as examples.
  • the first rotor, the second rotor, and the third rotor have a configuration in which the position of the magnet 6 having a rotation angle of 0 ° in the non-eccentric rotor 12 shown in FIG. .
  • FIG. 5A is a plan view of the first rotor.
  • the first rotor 2A is eccentric to one side (for example, the lower left side) in an oblique direction in which the magnet central axis 6C intersects the reference axis K at an angle of 45 ° with the central axis J. ing.
  • the magnet 6 rotates counterclockwise around the central axis J.
  • the second angle formed between the virtual line L2 is positioned in the clockwise direction with respect to the first imaginary line L1 and the first virtual line L1 as the first angle theta 1, the first virtual line L1 and the first virtual the second is the angle between the virtual line L2 is the second angle theta 2 in the counterclockwise direction with respect to the line L1.
  • the first angle theta 1 less than 180 °
  • the second angle theta 2 greater than 180 °.
  • the first angle ⁇ 1 corresponds to a first rotation angle of the first rotor 2A until the first magnetized boundary portions 16a and 16b pass through the detection element 5, respectively.
  • the second angle theta 2, the first magnetic boundary portion 16b, 16a corresponds to the second rotation angle in the first rotor 2A to pass through the detecting element 5, respectively.
  • the first period of the first magnetic flux density generated by rotating the first rotor 2A by the first rotation angle and the first rotor 2A A difference is generated between the second period of the second magnetic flux density generated by rotating by the second rotation angle.
  • the first cycle in which the rotation angle (first rotation angle) of the first rotor 2A is small is shorter than the second cycle in which the rotation angle (second rotation angle) of the first rotor 2A is large.
  • the pulse periods of the FG signals output based on the first magnetic flux density and the second magnetic flux density are not constant. That is, a difference occurs in the time of one pulse of the FG signal output based on the first magnetic flux density and the second magnetic flux density. Therefore, the rotation accuracy of the generated FG signal is reduced.
  • the eccentric direction of the magnet center axis 6C with respect to the center axis J has been described as being diagonally lower left, but the eccentric direction of the magnet center axis 6C is not limited to this. That is, the eccentric direction of the magnet center axis 6C is not particularly limited as long as it is a direction intersecting the reference line K at an angle other than 45 ° (excluding 90 ° described later).
  • the eccentric direction of the magnet center axis 6C with respect to the center axis J may be diagonally upper right, diagonally lower right, or diagonally upper left.
  • the rotor 2 of the present embodiment has a configuration different from that of the first rotor 2A.
  • FIG. 5B is a plan view of the second rotor.
  • the magnet center axis 6 ⁇ / b> C intersects (orthogonally) with the reference axis K at an angle of 90 ° with respect to the center axis J at one side (for example, the lower side) in the vertical direction.
  • the magnet 6 rotates counterclockwise around the central axis J.
  • first angle theta 1 is less than 180 °
  • second angle theta 2 greater than 180 °
  • the first rotor angle and the second rotor angle also have a difference in the second rotor 2B, so that there is a difference between the periods of the first magnetic flux density and the second magnetic flux density. Therefore, the pulse periods of the FG signals output based on the first magnetic flux density and the second magnetic flux density do not become constant. That is, a difference occurs in the time of one pulse of the FG signal output based on the first magnetic flux density and the second magnetic flux density. Therefore, the rotation accuracy of the generated FG signal is reduced.
  • the eccentric direction of the magnet center axis 6C with respect to the center axis J has been described as a lower side, but the eccentric direction of the magnet center axis 6C is not limited to this. That is, the eccentric direction of the magnet center axis 6C with respect to the center axis J may be on the upper side.
  • the rotor 2 of the present embodiment has a configuration different from that of the second rotor 2B.
  • FIG. 5C is a plan view of the third rotor.
  • the magnet center axis 6C is eccentric to one side (for example, the left side) in the direction along the reference line K with respect to the center axis J.
  • the magnet 6 rotates counterclockwise around the central axis J.
  • the rotor 2 of the present embodiment employs the structure of the third rotor 2C.
  • the reason for employing the third rotor 2C will be described.
  • the first magnetized boundary portions 16a and 16b are located on a straight line L passing through the magnet center axis 6C and the center axis J. That is, the first magnetized boundary portions 16a and 16b, the magnet central axis 6C, and the central axis J are arranged on the straight line L.
  • the first magnetized boundary portions 16a, 16b have a predetermined width in the circumferential direction. Therefore, in the present embodiment, the expression that the first magnetized boundary portions 16a and 16b, the magnet center axis 6C, and the center axis J are aligned on the straight line L means that the first magnetized boundary portions 16a and 16b are aligned with the center in the circumferential direction.
  • the state is not limited to the state where L completely coincides, and includes, for example, a state where at least a part of the first magnetized boundary portions 16a and 16b overlaps the straight line L in the circumferential direction.
  • the third rotor 2C since the first magnetic boundary portion 16a, 16b and the central axis J are aligned on a straight line, the first angle theta 1 and the second angle theta 2 is 180 °, respectively .
  • the rotor rotation angle (first rotation angle) until the first magnetization boundary portions 16a and 16b sequentially pass through the detection element 5, and the first magnetization boundary portions 16b and 16a determine the detection element 5.
  • the rotor rotation angle (the second rotation angle) before passing in order is 180 °.
  • FIG. 6 is a diagram showing a change in the positional relationship between the magnet and the detection element when the third rotor rotates. As shown in FIG. 6, in the third rotor 2 ⁇ / b> C, although the magnet 6 rotates in an eccentric state, each time the rotor rotates 180 °, the first magnetization boundary portions 16 a and 16 b pass through the detection element 5. Become like
  • the periods of the first magnetic flux density and the second magnetic flux density generated each time the third rotor 2C makes a half rotation (180 ° rotation) become equal to each other. Therefore, the pulse period (one pulse time) of the FG signal output based on the first magnetic flux density and the pulse period (one pulse time) of the FG signal output based on the second magnetic flux density become constant. . That is, since there is no difference in the time of one pulse of the FG signal output based on the first magnetic flux density and the second magnetic flux density, the FG signal with high rotational accuracy is not affected by the eccentricity of the magnet 6. Can be output.
  • the eccentric direction of the magnet center axis 6C with respect to the center axis J has been described as the left side in the direction along the reference line K, but the eccentric direction of the magnet center axis 6C is not limited to this. That is, the eccentric direction of the magnet center axis 6C is not particularly limited as long as it is a direction along the reference line K, and may be, for example, the right side in the direction along the reference line K.
  • the rotor 2 of the present embodiment employs the structure of the third rotor 2C. That is, in the rotor 2 of the present embodiment, the first magnetized boundary portions 16a and 16b, the magnet central axis 6C, and the central axis J are arranged side by side on the straight line L. Therefore, according to the motor 10 of the present embodiment having the rotor 2 employing the structure of the third rotor 2C, even if the magnet 6 rotates in an eccentric state, it is possible to reduce the deterioration of the rotation accuracy of the FG signal. it can. Therefore, the motor 10 of the present embodiment can reduce the deterioration of the rotation accuracy of the FG signal without being affected by the eccentricity generated in the rotor. Therefore, the motor 10 of the present embodiment can output an FG signal with high rotation accuracy.
  • FIG. 7A to 7C are diagrams illustrating a method of manufacturing the rotor 2.
  • a shake detection step is performed.
  • FIG. 7A is a diagram illustrating a shake detection step.
  • a rotor component member 20 in which a hollow cylindrical magnet material 26 is attached to the inner peripheral side of a covered cylindrical rotor core 8 having a shaft 9 extending along the central axis J.
  • the magnet material 26 is a material made of a magnetic material, and configures the magnet 6 by being magnetized.
  • the magnet material 26 is attached to the inner peripheral side of the rotor core 8 via the adhesive 7.
  • the thickness of the adhesive 7 becomes non-uniform depending on the volume due to a change in volume before and after curing, so that the magnet material 26 is displaced with respect to the rotor core 8.
  • the center axis J of the rotor core 8 and the center axis (magnet material center axis) 26C of the magnet material 26 are arranged at positions different from each other.
  • the central axis 26C coincides with the magnet central axis 6C of the magnet 6.
  • the direction of the run-out E with respect to the central axis J (the shaft 9) at the central axis 26C is determined.
  • the roller is moved over the entire inner peripheral surface by rotating the rotor component member 20.
  • the position of the center axis 26C of the magnet material 26 is obtained, and the deflection of the center axis 26C with respect to the center axis J is detected.
  • the run-out detection step of detecting run-out E in rotor component member 20 is completed.
  • the runout detection step after detecting runout of the rotor constituent member 20, the rotor constituent member 20 is vacuum-fixed, for example, to a marking device that performs a marking process described below while maintaining the orientation of the rotor constituent member 20.
  • the component 20 is delivered.
  • FIG. 7B is a diagram illustrating the marking step.
  • marking is performed on the outer peripheral surface 8a of the rotor core 8 based on the detection result of the above-described deflection detection step. Specifically, in the marking step, marking is performed on a position having a predetermined positional relationship with respect to a straight line L3 passing through the central axis 26C and the central axis J in the outer peripheral surface 8a.
  • a place having a predetermined positional relationship with the straight line L3 on the outer peripheral surface 8a refers to a place overlapping the straight line L3. That is, the mark (marking portion) M marked in the marking step is aligned with the center axis 26C and the center axis J on a straight line.
  • the mark M is provided in a range of ⁇ 3 ° or less in the circumferential direction with respect to the straight line L3 as the positional accuracy of the marking.
  • the width H1 of the mark M by the marking within the range of ⁇ 3 ° or less in the circumferential direction is 1.08 mm or less.
  • the method of performing the marking is not particularly limited.
  • the mark M may be formed on the outer peripheral surface 8a using a magic pen.
  • the mark M composed of a plurality of ink droplets is marked by using an inkjet method using an inkjet device.
  • the ink jet device performs marking, for example, in a state where the rotor component member 20 is vacuum-fixed.
  • the ink jet device may determine whether or not the mark M is accurately marked after marking by an imaging device such as a CCD camera after marking.
  • the mark M can be accurately marked with a desired width by discharging ink droplets on the outer peripheral surface 8a of the rotor core 8. Unlike the laser marking, the marking by the ink-jet method can make the mark M without damaging the surface of the rotor core 8. Thus, the marking process on the rotor component 20 is completed.
  • FIG. 7C is a diagram illustrating the magnetizing step.
  • the magnet material 26 is magnetized based on the mark M in the marking step to obtain the magnet 6.
  • the magnet material 26 is magnetized from outside the rotor core 8 by inserting the rotor constituent member 20 into the magnetized yoke 40.
  • the magnet 6 has the first magnetized boundary portions 16a and 16b in which the S pole 6s and the N pole 6n are arranged from the rear to the front in the rotation direction R.
  • magnetization is performed based on the mark M in a state where the magnet material 26 and the magnetization yoke 40 are aligned so that the first magnetization boundary portions 16a and 16b are located on the straight line L3. .
  • the magnetizing step of the magnet 6 is completed.
  • the mark M is provided in a range of ⁇ 3 ° or less in the circumferential direction with respect to the straight line L3 as described above.
  • the magnetizing material 26 and the magnetizing yoke 40 are aligned based on the mark M to perform magnetizing. Can be suppressed to ⁇ 8 ° or less.
  • the straight line L3 passing through the center axis 26C and the center axis J corresponds to the above-described straight line L passing through the magnet center axis 6C and the center axis J. . Therefore, according to the magnetizing step of the present embodiment, the above-described rotor 2 in which the first magnetized boundary portions 16a and 16b are located on the straight line L can be manufactured.
  • the position where the mark M is provided is not limited to the position overlapping the straight line L3.
  • the position of the straight line L3 passing through the center axis 26C and the center axis J can be specified based on the mark M when the magnet 6 is magnetized to generate the magnet 6. It may be any place. If the position of the straight line L3 can be specified, the magnetization can be performed with the magnet material 26 and the magnetized yoke 40 aligned with each other so that the first magnetized boundary portions 16a and 16b are located on the straight line L3.
  • the mark M may be composed of a plurality of parts.
  • the mark M may be formed by two marks separated from each other in the circumferential direction of the outer peripheral surface 8a.
  • the mark M may be configured so that the center of the two marks in the circumferential direction is located on the straight line L3.
  • the mark M has a predetermined positional relationship with the straight line L3, that is, the midpoint of the two marks is located on the straight line L3.
  • the motor 10 shown in FIG. 1 is manufactured by assembling the stator 1, the rotor 2, the bearing 3, the circuit board 4, and the detecting element 5 with respect to the rotor 2 manufactured as described above. be able to.
  • FIG. 8 is a diagram showing the appearance of the motor of the present embodiment.
  • the motor 10 of the present embodiment has a mark (marking portion) M provided on the outer peripheral surface 8a of the rotor core 8.
  • This mark M is obtained by the above-described marking process.
  • the central axis 26C coincides with the magnet central axis 6C. Therefore, the mark M is provided on the outer peripheral surface 8a so as to have a predetermined positional relationship with the straight line L passing through the magnet center axis 6C and the center axis J.
  • the mark M is provided on the outer peripheral surface 8a located on the straight line L.
  • the mark M, the first magnetized boundary portions 16a and 16b, the magnet center axis 6C, and the center axis J are located on the straight line L.
  • the motor 10 of the present embodiment by magnetizing the magnet 6 based on the mark M, the first magnetized boundary portions 16a and 16b, the magnet center axis 6C, and the center axis J are aligned.
  • the rotor 2 is arranged on the straight line L. Therefore, according to the motor 10 including the rotor 2, even when the rotor is eccentric, the deterioration of the rotation accuracy of the FG signal can be reduced without being affected by the eccentricity.
  • FIG. 9 is a horizontal sectional view of the vehicle headlamp.
  • the vehicle headlamp 100 shown in FIG. 9 is a left headlamp mounted on the left side of the front end of the vehicle, and has the same structure as the headlamp mounted on the right side except that it is bilaterally symmetric. Therefore, hereinafter, the left vehicle headlamp 100 will be described in detail, and the description of the right vehicle headlamp will be omitted.
  • the vehicle headlamp 100 includes a lamp body 112 having a concave portion that opens forward.
  • the lamp body 112 has a transparent front cover 114 whose front opening is covered by a front cover 114 to form a lamp chamber 116.
  • the lamp room 116 functions as a space in which the lamp unit 118 is housed.
  • the lamp unit 118 is a unit that employs a blade scan type ADB technology, and is configured to emit a so-called variable high beam.
  • the lamp unit 118 includes an optical unit 120 and a projection lens 122.
  • the optical unit 120 includes a rotating reflector 124 and a light source 126.
  • As the projection lens 122 for example, a convex lens is used. The shape of the convex lens may be appropriately selected according to the light distribution characteristics such as a required light distribution pattern and illuminance distribution, and an aspheric lens or a free-form surface lens is used.
  • An extension reflector 123 is provided around the projection lens 122.
  • the rotating reflector 124 reflects light emitted from the light source 126 while rotating in one direction around the rotation axis O1 by the motor 10 as a driving source, and forms a light distribution pattern by scanning the reflected light. It is configured as follows.
  • the rotary reflector 124 includes an annular reflection region 124a configured to reflect the light emitted from the light source 126 while rotating, and to form a desired light distribution pattern.
  • the control circuit 148 controls the light distribution pattern using the FG signal output from the motor 10. Since the motor 10 of the present embodiment outputs an FG signal with high rotation accuracy, the control circuit 148 can control the light distribution pattern with high accuracy.
  • the light source 126 is preferably capable of controlling turning on and off in a short time.
  • a semiconductor light emitting element such as an LED, an LD, and an EL element is suitable.
  • the motor 10 is mounted on the board 132.
  • the substrate 132 is mounted and fixed on the mounting surface 134a of the heat sink 134.
  • the mounting surface 134a is configured such that the rotation axis O1 of the rotary reflector 124 is inclined with respect to the optical axis AX or the forward direction of the vehicle when the substrate 132 is mounted.
  • the light source 126 is mounted on the substrate 136.
  • a lens 138 as a primary optical system is provided in the light emitting direction of the light source 126 and between the rotating reflector 124 and the light emitting direction.
  • the lens 138 condenses the light emitted from the light source 126 so that the light emitted from the light source 126 is directed to the reflection area 124a of the rotary reflector 124.
  • the substrate 136 is mounted on the heat sink 140.
  • the heat sink 134 and the heat sink 140 are fixed to a metal plate-shaped support member 142.
  • the lamp unit 118 is supported by a means using an aiming screw 144 and a nut 146 via a support member 142 so as to be tiltable with respect to the lamp body 112.
  • the control circuit 148 is connected to the light source 126 and the motor 10 via each substrate, and transmits a signal for controlling the light source 126 and the motor 10 and receives an FG signal output from the motor 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushless Motors (AREA)

Abstract

Un mode de réalisation de l'invention concerne un moteur comprenant : un rotor pourvu d'un noyau de rotor cylindrique à fond et d'un aimant cylindrique creux, ledit noyau de rotor étant pourvu d'un arbre s'étendant le long de l'axe central, ledit aimant étant disposé sur le côté circonférentiel interne du noyau de rotor ; un élément de détection destiné à détecter la densité de flux magnétique de l'aimant ; et une unité de sortie de signal destinée à émettre en sortie un signal relatif à la vitesse de rotation du rotor en fonction de la densité de flux magnétique. L'aimant comporte un premier et un deuxième pôle disposés de façon alternée dans le sens de la circonférence et comprend une première partie limite de magnétisation, dans laquelle le premier et le deuxième pôle sont alignés dans un sens opposé au sens de rotation, et une deuxième partie limite de magnétisation, dans laquelle le deuxième et le premier pôle sont alignés dans le sens opposé au sens de rotation, dans une vue en plan dans une direction longeant l'axe central, la première partie limite de magnétisation étant positionnée sur la ligne traversant l'axe central d'aimant, qui traverse le centre de l'aimant, et l'axe central.
PCT/JP2019/037826 2018-09-28 2019-09-26 Moteur WO2020067274A1 (fr)

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JP2018-183961 2018-09-28

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003230239A (ja) * 2002-01-31 2003-08-15 Mitsuba Corp ブラシレスモータ
JP2006191738A (ja) * 2005-01-06 2006-07-20 Yaskawa Electric Corp 磁気式エンコーダ付き永久磁石同期モータ
JP2006311665A (ja) * 2005-04-27 2006-11-09 Japan Servo Co Ltd モータ及びモータ用固定子
JP2016123206A (ja) * 2014-12-25 2016-07-07 日本電産株式会社 モータ
JP2018148682A (ja) * 2017-03-05 2018-09-20 橋本　秀紀 サーボアクチュエータ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102005836B (zh) * 2010-12-10 2012-11-14 上海电机学院 外转子磁场增强型磁通切换双凸极电机
JP6561692B2 (ja) * 2015-08-31 2019-08-21 スズキ株式会社 回転電機
JP2018143043A (ja) * 2017-02-28 2018-09-13 日本電産株式会社 モータ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003230239A (ja) * 2002-01-31 2003-08-15 Mitsuba Corp ブラシレスモータ
JP2006191738A (ja) * 2005-01-06 2006-07-20 Yaskawa Electric Corp 磁気式エンコーダ付き永久磁石同期モータ
JP2006311665A (ja) * 2005-04-27 2006-11-09 Japan Servo Co Ltd モータ及びモータ用固定子
JP2016123206A (ja) * 2014-12-25 2016-07-07 日本電産株式会社 モータ
JP2018148682A (ja) * 2017-03-05 2018-09-20 橋本　秀紀 サーボアクチュエータ

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