WO2020071446A1 - Pluralité de produits de moteur, moteur, groupe de moteurs, dispositif d'entraînement et groupe d'aimants - Google Patents

Pluralité de produits de moteur, moteur, groupe de moteurs, dispositif d'entraînement et groupe d'aimants

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Publication number
WO2020071446A1
WO2020071446A1 PCT/JP2019/038981 JP2019038981W WO2020071446A1 WO 2020071446 A1 WO2020071446 A1 WO 2020071446A1 JP 2019038981 W JP2019038981 W JP 2019038981W WO 2020071446 A1 WO2020071446 A1 WO 2020071446A1
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WO
WIPO (PCT)
Prior art keywords
magnet
measurement
motor
total
magnetic flux
Prior art date
Application number
PCT/JP2019/038981
Other languages
English (en)
Japanese (ja)
Inventor
憲一 藤川
田中　伸幸
出光 尾関
正一朗 齊藤
克也 久米
Original Assignee
日東電工株式会社
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
Priority claimed from JP2019181588A external-priority patent/JP2020078231A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN201980064493.6A priority Critical patent/CN112789788A/zh
Publication of WO2020071446A1 publication Critical patent/WO2020071446A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]

Definitions

  • the present invention relates to a motor and a motor group including a magnet, and a driving device including such a magnet.
  • Motors that convert electric energy into mechanical kinetic energy are widely used in the fields of machine tools, vehicles, aircraft, and the like.
  • a motor is provided with a permanent magnet, and as the permanent magnet, for example, a parallel-oriented rectangular magnet in which easy axes of magnetization are aligned in parallel, a polar anisotropic ring magnet, and the like are used.
  • Patent Document 1 proposes to use a polar anisotropic ring magnet whose magnetization direction is controlled to a specific direction in order to suppress cogging torque.
  • the present invention has been made in view of such a background, and an object of the present invention is to provide a motor and a motor group capable of further suppressing cogging torque. Another object of the present invention is to provide a driving device including such a motor or a group of motors.
  • the measurement line is substantially at the center of the first main surface and extends along a direction parallel to the specific cross section.
  • 1 represents a measurement trajectory corresponding to the whole of the main surface, wherein the measurement line is defined at a spatial position 1 mm above the first main surface,
  • a total represents the total average surface magnetic flux density, and the average of the absolute values of the surface magnetic flux densities at the same measurement position on the measurement line in each sintered magnet is defined as B ave [mT].
  • ⁇ total represents the total standard deviation
  • ⁇ [mT] the standard deviation of the surface magnetic flux density at each measurement position used for calculating the total average surface magnetic flux density
  • a motor having a plurality of magnets Each magnet is a sintered magnet having a non-parallel-oriented region, and has a first main surface where the peak value of the surface magnetic flux density is maximum,
  • the surface magnetic flux density was measured over the measurement line on the first main surface of each magnet, the following equation was obtained.
  • Magnet deviation variation P [%] ( ⁇ total [mT] / A total [mT]) ⁇ 100 Is provided, the deviation P between the magnets represented by the following expression is 4% or less.
  • a driving device having a motor or a group of motors having the above-described features.
  • the void ratio of each magnet is preferably 5% or less, more preferably 3% or less, and even more preferably 1% or less.
  • the deviation P [%] between the magnets is preferably 3% or less, more preferably 2% or less.
  • a motor and a motor group capable of further suppressing cogging torque. Further, according to the present invention, it is possible to provide a driving device including such a motor or a group of motors.
  • FIG. 1 is a diagram schematically showing a cross section of a motor according to an embodiment of the present invention.
  • FIG. 2 is a diagram schematically illustrating an example of a sintered magnet mounted on the motor illustrated in FIG. 1.
  • FIG. 3 is a diagram schematically illustrating a cross section taken along line S1-S1 of the sintered magnet in FIG. 2.
  • FIG. 3 is a view schematically showing surface magnetic flux density distributions on a first main surface and a second main surface in a sintered magnet having a polar anisotropic orientation of an easy axis. It is the figure which showed typically operation
  • FIG. 4 is a diagram schematically illustrating a cross section of a motor according to another embodiment of the present invention.
  • FIG. 8 is a diagram schematically illustrating an example of a sintered magnet mounted on the motor illustrated in FIG. 7.
  • FIG. 9 is a diagram schematically illustrating a cross section of the sintered magnet illustrated in FIG. 8. It is the figure which showed typically the operation
  • FIG. 4 is a diagram for explaining a method of determining parallel alignment / non-parallel alignment by the EBSD method. It is the figure which showed typically the cross section perpendicular
  • FIG. 1 is a diagram schematically illustrating a motor group according to an embodiment of the present invention. It is the figure which showed typically the cross section of the inner rotor type rotary motor in which a magnet rotates.
  • FIG. 2 is a diagram schematically illustrating the shape of a sintered magnet manufactured in Example 1.
  • FIG. 3 is a diagram collectively showing measurement results of surface magnetic flux densities of the respective sintered magnets manufactured in Example 1.
  • FIG. 9 is a view collectively showing measurement results of surface magnetic flux densities of the respective sintered magnets manufactured in Example 2.
  • FIG. 9 is a view collectively showing measurement results of surface magnetic flux densities of the respective sintered magnets manufactured in Example 3.
  • FIG. 13 is a diagram collectively showing measurement results of surface magnetic flux densities of the respective sintered magnets manufactured in Example 4.
  • FIG. 4 is a diagram showing an example of an image obtained at the time of measuring a void of a sintered magnet in an example.
  • FIG. 14 is a diagram schematically showing the shape of a sintered magnet used in Example 11.
  • FIG. 9 is a diagram illustrating an example of an image obtained when measuring a void of a sintered magnet in a comparative example.
  • FIG. 14 is a diagram schematically showing the shape of a sintered magnet used in Example 12.
  • FIG. 9 is a diagram illustrating an example of an image obtained when measuring a void of a sintered magnet in a comparative example.
  • FIG. 2 is a diagram schematically illustrating a configuration of an apparatus used for a simulation.
  • FIG. 37 is a schematic enlarged view of a portion surrounded by a thick frame in FIG. 36.
  • 4 is a graph showing a relationship between a deviation P between magnets and a cogging torque width ⁇ T obtained by a simulation. It is a figure showing the shape and size of the motor used for the simulation in the fourth device. It is a graph which shows the relationship between the deviation P between magnets obtained by simulation in the 4th apparatus, and the average of a harmonic amplitude ratio. It is the figure which showed typically the focal point coordinate used for the simulation in the 5th apparatus. It is a figure showing the shape dimension of the motor used for simulation in the 5th device. It is a graph which shows the relationship between the deviation P between magnets obtained by the simulation in the 5th apparatus, and the average of a harmonic amplitude ratio.
  • the “first main surface” of the magnet means a surface of the magnet where a surface magnetic flux density having a “maximum” peak value is obtained.
  • the “second main surface” of the magnet means a surface located on the opposite side of the first main surface. Further, the “thickness” of the magnet means a distance between the first main surface and the second main surface.
  • the peak value “maximum” means that the peak value is farthest from the reference 0 (zero) regardless of the positive or negative value of the peak.
  • FIG. 1 schematically shows a cross section of a motor according to an embodiment of the present invention.
  • a motor (hereinafter, referred to as a “first device”) 101 includes a rotor 112 rotatably installed around a shaft 110 and surrounds the rotor 112. And a stator 114. A coil 118 having a predetermined number of turns is provided at a predetermined position on the stator 114.
  • the rotor 112 has a plurality of sintered magnets 120.
  • the rotor 112 has a total of four sintered magnets 120.
  • the number of sintered magnets provided in rotor 112 is not particularly limited as long as it is plural.
  • rotor 112 may have an even number of sintered magnets 120.
  • FIG. 2 schematically shows an example of the shape of the sintered magnet 120 mounted on the first device 101.
  • the sintered magnet 120 has a substantially rectangular parallelepiped shape. That is, the sintered magnet 120 has a first surface 130 and a second surface 132 facing each other, and four side surfaces connecting the surfaces 130 and 132. The four sides are referred to as a first side 136, a second side 137, a third side 138, and a fourth side 139, respectively, counterclockwise.
  • the first surface 130 is a first main surface
  • the second surface 132 is a second main surface. That is, it is assumed that the sintered magnet 120 has the maximum surface magnetic flux density at the first surface 130.
  • each surface of the sintered magnet 120 is associated with three orthogonal axes (XYZ axes).
  • first surface 130 and the second surface 132 are parallel to the XY plane
  • first side 136 and the third side 138 are parallel to the XZ plane
  • second side 137 and the fourth side 138 Is parallel to the YZ plane.
  • the dimension L of the first surface 130 and the second surface 132 in the X direction is referred to as the “length” of the sintered magnet 120
  • the dimension W of the first surface 130 and the second surface 132 in the Y direction is It is referred to as the “width” of the sintered magnet 120.
  • the distance between the first surface 130 and the second surface 132, that is, the dimension t of each of the side surfaces 136 to 139 in the Z direction is the “thickness” of the sintered magnet 120.
  • the sintered magnet 120 is formed by sintering magnet material particles.
  • Each magnet material particle has an easy axis of magnetization.
  • FIG. 3 schematically shows a cross section taken along line S1-S1 in FIG. 2, that is, a direction substantially parallel to the XZ plane at the approximate center of the width W of the sintered magnet 120.
  • each line segment in the cross section 160 represents the orientation direction of the easy axis of the magnet material particles.
  • the arrow of the line segment indicates the magnetization direction.
  • the cross section 160 of the sintered magnet 120 has a region 162 in which the axis of easy magnetization of the magnet material particles is “polarly anisotropically oriented”.
  • the "polar anisotropic orientation of the axis of easy magnetization" of the permanent magnet means that a difference in the maximum surface magnetic flux density between the first main surface and the second main surface of the permanent magnet is twice or more.
  • Such an orientation of the axis of easy magnetization includes a configuration in which the easy axis of the magnet material particles is gradually changed along a predetermined direction.
  • FIG. 4 schematically shows the surface magnetic flux density distribution on each of the first main surface and the second main surface in the permanent magnet having the polar anisotropic orientation of the easy axis.
  • the measurement position (horizontal axis) is a direction perpendicular to the width direction of the permanent magnet.
  • the first main surface has a surface magnetic flux density distribution having a larger peak value than the other surfaces
  • the first main surface has The second principal surface has a feature that such a surface magnetic flux density distribution cannot be obtained. That is, a significantly different surface magnetic flux density distribution is obtained between the first main surface and the second main surface.
  • a typical permanent magnet in which the easy axis of magnetization is polar anisotropically oriented has a feature that the ratio P 1 / P 2 is 2 or more, for example, 3 or more.
  • the region 162 which is polar anisotropically oriented as shown in FIG. 3 does not need to be present in all sections parallel to the thickness direction. It is sufficient if it is present in at least one of them.
  • a cross section in which the region 162 having such polar anisotropic orientation is recognized is particularly referred to as a “specific cross section”.
  • the above-described “length L” can also be defined as a dimension of a connection portion connecting the first main surface and the specific cross section.
  • the “width W” can be defined as a dimension perpendicular to the length L and perpendicular to the thickness t.
  • each sintered magnet 120 mounted on the first device 101 has a direction parallel to a specific cross section at substantially the center in the width direction of the first main surface (that is, the first surface 130).
  • the surface magnetic flux density is measured in a region extending from one end to the other end of the sintered magnet 120 along (X direction in FIG. 2), the following equation (1) is obtained.
  • Magnet deviation variation P [%] ( ⁇ total [mT] / A total [mT]) ⁇ 100 (1) Is characterized in that the deviation P between the magnets represented by is not more than 4%.
  • a measurement trajectory over the entire first main surface along a direction parallel to the specific cross section is referred to as a “measurement line”. Name.
  • a total [mT] represents a total average surface magnetic flux density.
  • the total average surface magnetic flux density A total [mT] is obtained by averaging the absolute values of the surface magnetic flux densities at the same measurement position on the measurement line of each sintered magnet 120, and defining this as B ave [mT]. It is determined by summing the average values B ave [mT] at all measurement positions on the measurement line.
  • ⁇ total [mT] represents the total standard deviation.
  • the total standard deviation ⁇ total [mT] is a standard deviation of the surface magnetic flux density at each measurement position used for calculating the total average surface magnetic flux density A total [mT] on the measurement line of each sintered magnet 120.
  • [mT] the standard deviation ⁇ [mT] at all the measurement positions on the measurement line is calculated by summing them.
  • the sintered magnet 120 has the first surface 130 as the first main surface and the XZ plane as the specific cross section. At the approximate center in the width direction of the second side surface 137 to the fourth side surface 139 (or vice versa).
  • the total average surface magnetic flux density A total [mT] is obtained by measuring the absolute value of the surface magnetic flux density at the same position on the measurement line in the four sintered magnets 120, and calculating the average value B ave [ mT], which is performed at all positions on the measurement line, and is obtained by summing the obtained average values B ave [mT].
  • the total standard deviation ⁇ total [mT] is the standard deviation ⁇ [mT] of each of the four sintered magnets 120 at each measurement position on the measurement line selected to obtain the above-described average value B ave [mT]. ] Is calculated at all positions on the measurement line, and the obtained standard deviation ⁇ [mT] is summed.
  • the measurement line is selected so as to directly contact the first main surface of the sintered magnet 120, accurate evaluation of the surface magnetic flux density may be difficult due to the shape of the first main surface. Therefore, in the present application, the measurement line is selected to be a space 1 mm above the first main surface of the sintered magnet 120.
  • the measurement points on the measurement line are separated at a fixed interval, and in this case, the interval between two adjacent measurement points is 4 ⁇ m.
  • the deviation P [%] between the magnets represented by the formula (1) can be used as an index indicating the variation in the magnetic characteristics of the plurality of sintered magnets 120 used in the motor. In other words, it can be said that the smaller the P value, the smaller the variation in characteristics among the used sintered magnets 120.
  • the conventional motor has a problem that it is difficult to sufficiently suppress the cogging torque.
  • the sintered magnet 120 mounted on the first device 101 has a feature that the deviation variation P expressed by the equation (1) is suppressed to 4% or less.
  • the obtained data may not be able to be compared with each other. In this case, it becomes impossible to accurately evaluate the deviation P between the magnets.
  • the surface magnetic flux density data obtained by measuring the measurement line in the direction from the second side surface 137 to the fourth side surface 139 and the measurement line in the direction from the fourth side surface 139 to the second side surface 137 cannot be directly compared. Further, it is difficult to distinguish the difference between the second side surface 137 and the fourth side surface 139 of each sintered magnet 120 only by visually checking each sintered magnet 120.
  • the measurement start end and the measurement direction of the sintered magnet 120 are determined as shown in FIGS. 5 and 6 below.
  • 5 and 6 schematically show an operation procedure for determining the measurement direction, that is, the measurement start end.
  • the surface magnetic flux density of each sintered magnet 120 is measured along the measurement line from the measurement start end arbitrarily determined to the opposite end. Thereby, in each of the sintered magnets 120, the relationship between the measurement position (horizontal axis) and the surface magnetic flux density (vertical axis) as shown in FIG. 5 (hereinafter referred to as “acquired data”) is obtained.
  • the measurement direction is provisionally determined from the end 1 to the end 2.
  • absolute value data data obtained by converting the surface magnetic flux density into an absolute value (hereinafter, referred to as “absolute value data”) is obtained.
  • the absolute value data can be obtained by bending the measurement result shown in FIG. 5 along the X axis.
  • the maximum peak Pmax is determined in the absolute value data.
  • the end 1 and the end 2 that are closer to the position of the maximum peak P max are selected, and this is set as the measurement start end.
  • the end 1 is the measurement start end.
  • the area surrounded by the X axis in each peak is obtained, and the larger area is defined as the maximum peak Pmax .
  • the position of the maximum peak P max is exactly equidistant from the end 1 and the end 2.
  • the absolute value data and the area of the region surrounded by the X axis are determined from the position of the maximum peak P max , that is, the center between the end 1 and the end 2 toward each end.
  • the end included in the larger area of the area including the end 1 and the area including the end 2 is defined as the measurement start end.
  • the direction from the measurement start end to the other end is determined as the measurement direction of the surface magnetic flux density.
  • the measurement start end and the measurement direction can be aligned in each sintered magnet 120. In addition, this makes it possible to accurately evaluate the deviation P between the magnets.
  • the sintered magnet 120 used in the first device 101 is not particularly limited, but may be, for example, a rare earth sintered magnet.
  • the sintered magnet 120 may include R (R is one or more of rare earth elements including Y), B (boron), and Fe (iron).
  • R 27 wt% to 40 wt% (preferably 28 wt% to 35 wt%, more preferably 28 wt% to 33 wt%)
  • B 0.6 wt% to 2 wt% (preferably 0.1 wt%). (6 wt% to 1.2 wt%, more preferably 0.6 wt% to 1.1 wt%).
  • the sintered magnet 120 may be, for example, an Nd-Fe-B based magnet.
  • the sintered magnet 120 is made of Co, Cu, Al, Si, Ga, Nb, V, Pr, Mo, Zr, Ta, Ti, W, Ag, Bi, Zn, and / or Mg for improving magnetic properties. And a small amount of inevitable impurities.
  • the size of the sintered magnet 120 is not particularly limited, but the length L may be, for example, in a range of 5 mm to 40 mm. Further, the width W of the sintered magnet 120 may be in a range of 10 mm to 150 mm. Further, the thickness t of the sintered magnet 120 may be in a range from 1.5 mm to 8 mm.
  • FIG. 7 schematically shows a cross section of a motor according to another embodiment of the present invention.
  • the motor (hereinafter, referred to as “second device”) 201 includes a rotor 212 rotatably installed around a shaft 210 and a stator 214 surrounding the rotor 212.
  • a coil 218 having a predetermined number of turns is provided at a predetermined position on the stator 214.
  • the rotor 212 has a plurality of sintered magnets 220.
  • the rotor 212 includes a total of four sintered magnets 220 along the axial direction of the shaft 210, although it is difficult to visually recognize the magnets from FIG. 7.
  • the number of sintered magnets provided in rotor 212 is not particularly limited as long as it is plural.
  • rotor 212 may have an even number of sintered magnets 220.
  • FIG. 8 schematically shows an example of the shape of the sintered magnet 220 mounted on the second device 201.
  • the sintered magnet 220 has a substantially ring shape. That is, sintered magnet 220 has a first surface 230 and a second surface 232 facing each other, and an outer surface 236 and an inner surface 237 connecting both surfaces 230 and 232.
  • the outer surface 236 is a first main surface
  • the inner surface 237 is a second main surface. That is, it is assumed that the sintered magnet 220 has the maximum surface magnetic flux density on the outer surface 236.
  • the sintered magnets 220 are associated with each other by three orthogonal axes (XYZ axes). That is, the first surface 230 and the second surface 232 are parallel to the XZ plane, and the outer surface 236 and the inner surface 237 extend parallel to the Y direction.
  • the dimension between the outer surface 236 and the inner surface 237 is the thickness t.
  • the distance W between the first surface 230 and the second surface 232 is defined as “width”.
  • FIG. 9 schematically shows a cross section along the direction parallel to the XZ plane at substantially the center of the width W of the sintered magnet 220.
  • each line segment in the cross section 260 indicates the orientation direction of the easy axis of the magnet material particles.
  • the arrow of the line segment indicates the magnetization direction.
  • the cross section 260 of the sintered magnet 220 has a region 262 in which the axis of easy magnetization of the magnet material particles is “polarly anisotropically oriented”. As described above, the cross section in which the region 262 having the polar anisotropic orientation is recognized is particularly referred to as a “specific cross section”.
  • connection portion is a portion connecting the first main surface and the specific cross section (the first surface 230 or the second surface 230). (The outer periphery of the surface 232).
  • the “width W” can be defined as a dimension perpendicular to the connection portion and perpendicular to the thickness t.
  • the “measurement line” means a measurement trajectory extending along the direction parallel to the specific cross section over the entire first main surface.
  • the measurement line in the sintered magnet 220 is formed around the outer periphery of the sintered magnet 220 along the plane parallel to the XZ plane substantially at the center of the outer surface 236 in the width direction. (Exactly, the outer circumference 1 mm away from the outer side surface 236).
  • the total average surface magnetic flux density A total [mT] and the total standard deviation ⁇ total [mT] are as defined above.
  • the total average surface magnetic flux density A total [mT] of the sintered magnets 220 is equal to the surface magnetic flux density of the four sintered magnets 220 at the same position on the measurement line.
  • the total standard deviation ⁇ total [mT] is the standard deviation ⁇ [mT] of each of the four sintered magnets 220 at each measurement position on the measurement line selected to obtain the above-described average value B ave [mT]. ] Is calculated at all positions on the measurement line, and the obtained standard deviation ⁇ [mT] is summed.
  • the actual measurement line is set at a spatial position 1 mm above the first main surface.
  • measurement points on the measurement line are separated at a constant interval.
  • two adjacent measurement points are selected such that the center angle about the center C (see FIG. 9) of the specific cross section of the sintered magnet 220 is 0.04 °.
  • the deviation P [%] between the magnets represented by the equation (1) can be used as an index indicating the variation in the magnetic characteristics of the plurality of sintered magnets 220 used in the motor. In other words, it can be said that the smaller the P value, the smaller the variation in characteristics among the used sintered magnets 220.
  • the obtained data may not be able to be compared with each other. In this case, it becomes impossible to accurately evaluate the deviation P between the magnets.
  • FIGS. 10 and 11 schematically show an operation procedure for determining the measurement start point and the measurement direction.
  • the surface magnetic flux density of each sintered magnet 220 is measured along an arbitrary line from a measurement start point arbitrarily determined along a measurement line. Thereby, in each of the sintered magnets 220, the relationship between the mechanical angle (horizontal axis) and the surface magnetic flux density (vertical axis) as shown in FIG. 10 (hereinafter referred to as “acquired data”) is obtained.
  • absolute value data data obtained by converting the surface magnetic flux density into an absolute value (hereinafter, referred to as “absolute value data”) is obtained.
  • the absolute value data can be obtained by bending the measurement result shown in FIG. 10 along the X axis.
  • the maximum peak Pmax is determined in the absolute value data. Further, both sides of the maximum peak P max defined, defines two peaks closest to the maximum peak P max, respectively, and the first peak P 1 and the second peak P 2. Further, of the first peak P 1 and the second peak P 2, the larger, selects the particular proximity peak P n. For example, in the example shown in FIG., The first peak P 1 is specified proximity peak P n.
  • the area surrounded by the X axis in each peak is obtained, and the larger area is defined as the maximum peak Pmax .
  • a position between the specific proximity peak Pn and the maximum peak Pmax where the surface magnetic flux density becomes zero is set as a measurement start point of the surface magnetic flux density.
  • the direction from the measurement start point toward the maximum peak Pmax is defined as the measurement direction.
  • the acquired data is converted to obtain converted data.
  • the measurement start point and the measurement direction on the measurement line can be aligned in each sintered magnet 220. In addition, this makes it possible to accurately evaluate the deviation P between the magnets.
  • the first main surface may not be represented by a substantially flat surface or a substantially circular shape.
  • the measurement line is selected from the trajectory from which the surface magnetic flux density can be more stably evaluated among the above-mentioned straight trajectory and circumferential trajectory.
  • the material and the like of the sintered magnet 220 used in the second device 201 are the same as those of the sintered magnet 120 described above.
  • the size of the sintered magnet 220 is not particularly limited, but the width W may be, for example, in a range of 10 mm to 150 mm. Further, the outer diameter of the sintered magnet 220 may be, for example, in a range of 8 mm ⁇ to 60 mm ⁇ . Further, the thickness t of the sintered magnet 220 may be in a range from 1.5 mm to 6 mm.
  • the shape of the magnet used in the present invention is not particularly limited.
  • the ring-shaped sintered magnet 220 may be divided into two, three, four, or more, and a segmented sintered magnet may be used.
  • the magnet used in the motor according to the present invention is not limited to a sintered magnet having polar anisotropy. That is, in the present invention, any sintered magnet having a “non-parallel-oriented” region can be applied as long as the inter-magnet variation P obtained by the above-described equation (1) is 4% or less.
  • the non-parallel orientation means an orientation other than the parallel orientation. Specifically, the non-parallel orientation means all orientations having a region where the crystal orientation differs by 20 ° or more.
  • the non-parallel orientation includes, for example, polar anisotropic orientation and radial orientation.
  • the “specific cross section” is defined as the cross sections 160 and 260 having the polar anisotropically oriented regions 162 and 262.
  • a cross section having a region of an orientation other than the parallel orientation is broadly defined as a “specific cross section”.
  • a magnet having a region of non-parallel orientation means a magnet having a region in which a crystal orientation differs by 20 ° or more in a “specific cross section”.
  • FIG. 12 shows a cross section AP perpendicular to the first main surface of the substantially rectangular parallelepiped sintered magnet. Note that the cross section AP is a cross section parallel to the moving direction of the motor and a direction perpendicular to the first main surface.
  • Whether the cross-section AP has a region of non-parallel orientation is determined in the following manner: (I) In the cross-section AP, a line segment (hereinafter, referred to as a “divided line CL”) that connects substantially the centers in the thickness (t) direction is determined. (Ii) Each point that divides the dividing line CL into eight (hereinafter, referred to as “point CP”) is determined. (Iii) At each point CP, the orientation vector (the direction with the highest frequency) of the easy axis is measured in the region of 100 ⁇ m ⁇ 100 ⁇ m by the EBSD method. The measurement region is appropriately selected according to the size of the magnet material particles forming the sintered magnet.
  • the orientation vector of the easy axis can be determined.
  • Orientation vectors at all points CP are compared, and if the maximum angular difference is 20 ° or more, it is determined that the cross section is a specific cross section and has a region of non-parallel alignment.
  • a substantially ring-shaped sintered magnet such as the sintered magnet 220 shown in FIGS. 8 and 9.
  • a “line segment” that connects substantially the center in the thickness (t) direction is a “circumference”. Therefore, in this case, the following evaluation is performed: (I ′) In the cross-section AP, a circumference (hereinafter, referred to as a “divided line CL”) connecting substantially the centers in the thickness (t) direction is determined. (Ii ′) Each point that divides the dividing line CL into eight (hereinafter, referred to as “point CP”) is determined.
  • ⁇ ⁇ ⁇ ⁇ Parallel orientation / non-parallel orientation in the sintered magnet can be determined by such a method.
  • the type of motor to which the present invention is applied is not particularly limited.
  • the motor may be, for example, a surface magnet type motor (SPM motor), an embedded magnet type motor (IPM motor), or a linear motor.
  • the SPM motor has a configuration in which a sintered magnet is installed on the surface of the rotor as shown in FIG. 7 among the rotary motors.
  • the IPM motor has a configuration in which a sintered magnet is embedded in the rotor among the rotary motors.
  • the linear motor has a configuration capable of linear movement.
  • FIG. 13 schematically shows a cross section perpendicular to the axial direction of the IPM motor.
  • FIG. 14 schematically shows a cross section parallel to the moving direction of the linear motor.
  • the IPM motor 401 has a rotor 412 rotatably mounted around a shaft 410 and a stator 414 surrounding the rotor 412.
  • a coil 418 having a predetermined number of turns is provided at a predetermined position on the stator 414.
  • the IPM motor 401 is significantly different from the SPM motor in that the sintered magnet 420 is embedded inside the rotor 412.
  • the rotor 412 has four sintered magnets 420.
  • the number of sintered magnets 420 provided in rotor 412 is not particularly limited as long as it is plural.
  • rotor 412 may have an even number of sintered magnets 420.
  • the linear motor 451 has a configuration capable of linear movement.
  • the linear motor 451 includes a mover 453 and a stator 455.
  • the mover 453 has a yoke 467 and a plurality of coils 468.
  • the stator 455 has a base 460 and a plurality of sintered magnets 470 disposed on the base 460.
  • the cogging torque can be more remarkably suppressed by applying the embodiment of the present invention. This is because, in the SPM motor and the linear motor, the magnetic flux generated from the sintered magnet is not affected by the electromagnetic steel plate of the rotor and is linked to the stator.
  • FIG. 15 schematically shows a motor group according to an embodiment of the present invention.
  • a motor group (hereinafter, referred to as a “third device”) 300 includes a plurality of motors 301 of the same type.
  • the third device 300 includes a total of ten motors 301 (301A, 301B,..., 301J).
  • the number of motors 301 included in third device 300 is not particularly limited as long as it is two or more.
  • Each of the motors 301A to 301J has one sintered magnet (which is difficult to recognize from FIG. 15).
  • the form of the sintered magnet included in each of the motors 301A to 301J is not particularly limited, the sintered magnet is, for example, a ring-shaped sintered magnet 220 as shown in FIGS. 8 and 9 described above. Is also good.
  • each sintered magnet is a plane parallel to the moving direction (rotation plane) of each of the motors 301A to 301J.
  • the “measurement line” means a measurement trajectory extending along the direction parallel to the specific cross section over the entire first main surface.
  • the measurement line is substantially parallel to the XZ plane at the center of the outer surface 236 of the sintered magnet 220 in the width direction.
  • the measurement line is substantially parallel to the XZ plane at the center of the outer surface 236 of the sintered magnet 220 in the width direction.
  • the total average surface magnetic flux density A total [mT] and the total standard deviation ⁇ total [mT] are as defined above.
  • the deviation P [%] between the magnets represented by the expression (1) can be used as an index indicating the variation in the magnetic characteristics of each sintered magnet. That is, it can be said that the smaller the P value, the smaller the variation in characteristics among the used sintered magnets.
  • each of the motors 301A to 301J includes such a sintered magnet, it is possible to significantly suppress vibration and noise.
  • model number of a motor product is a unique label defined by the manufacturer to distinguish between various motor products.In general, if the same model number is assigned, they must be recognized as the same motor product. Can be.
  • the induced voltage constant measured by the same measuring instrument is within the range of ⁇ 3%, it is determined that the motor products are the same as each other. Note that the induced voltage constant of a motor product is determined by induced voltage effective value / rotation speed for a rotary motor, and induced voltage effective value / moving speed for a linear motor.
  • the rotary motor is roughly divided into two parts, a stator and a rotor.
  • the rotary motor has a configuration in which a magnet is disposed on a rotor and a configuration in which a magnet is disposed on a stator side.
  • the direction in which the magnet is disposed is referred to as a field
  • the direction in which the coil is disposed is referred to as an armature, so that the expression can be applied to any configuration.
  • the overall length LA represents the maximum dimension in the axial direction of the motor product. However, the dimensions exclude the movable portion (the terminal wire for transmitting electric energy / signal) whose shape changes. -Induced voltage constant-Number of poles The number of poles can be obtained by reading the period of the induced voltage waveform with an oscilloscope or the like and doubling the number of periods per rotation of the motor shaft.
  • [Armature] ⁇ Number of slots MS
  • the number of slots MS is determined as the number of slots into which coils are inserted. However, measurement is not required for coreless motors and slotless motors.
  • the diameter DS is obtained by doubling the length of a line connecting the center of the motor shaft and the position of the armature that projects to the most magnetic field side when the armature is viewed from the motor axis direction. .
  • Teeth width WT (WT1, WT2)
  • the tooth width WT means a linear distance between adjacent slots. Usually, the distance changes between the outer peripheral side and the inner peripheral side of the slot.
  • the linear distance between adjacent slots on the outer peripheral side of the slot is defined as WT1
  • the linear distance between adjacent slots on the inner peripheral side of the slot is defined as WT2.
  • measurement is not required for coreless motors and slotless motors.
  • ⁇ Total number of coils NC -Presence or absence of pseudo groove The pseudo groove means a notch groove existing on the field facing surface of the armature.
  • measurement is not required for coreless motors and slotless motors.
  • FIGS. 16 to 19 schematically show a part of the above evaluation items in each type of motor product as an example.
  • FIG. 16 shows a cross section of an inner rotor type rotary motor in which a magnet rotates.
  • FIG. 17 shows a cross section of an outer rotor type rotation motor in which a coil rotates.
  • FIG. 18 shows a cross section of an outer rotor type rotation motor in which a magnet rotates.
  • FIG. 19 shows a cross section of an inner rotor type rotary motor in which a coil rotates.
  • reference numeral GM represents a pseudo groove.
  • the linear motor is roughly divided into two parts, a mover and a stator. Further, the linear motor has a configuration in which the magnet is disposed on the mover and a configuration in which the magnet is disposed on the stator.
  • the direction in which the magnet is disposed is referred to as a field
  • the direction in which the coil is disposed is referred to as an armature, so that the expression can be applied to any configuration.
  • the total length LA represents the maximum armature dimension in a direction perpendicular to the moving direction of the motor product and in a direction parallel to the facing surface between the armature and the field. However, the dimensions exclude the movable portion (the terminal wire for transmitting electric energy / signal) whose shape changes.
  • ⁇ Induced voltage constant [armature] ⁇ Number of slots MS The number of slots MS is defined as the total number of slots in the movable direction that completely covers the entire length of the mover in the movable direction. However, measurement is not required for coreless motors and slotless motors.
  • the pitch PA between the coils is defined as a coil of one bundle of coils forming a ring, starting from the center of the distance between the coils in the movable direction, and being a coil of one adjacent bundle forming another ring.
  • the distance between two points when the center of the distance is the end point.
  • ⁇ Total number of coils NC The total number of coils NC is determined as the total number of coils in a range completely covering the entire length of the mover in the movable direction in the movable direction.
  • [Field] -Number of magnets The number of magnets shall be the number of magnets in the movable direction that completely covers the entire length of the mover along the movable direction.
  • ⁇ Length LM of magnet The length LM of the magnet represents the size of the magnet in a direction perpendicular to the movable direction and parallel to the facing surface between the armature and the field. However, when there are a plurality of magnets in a range in which the magnets completely cover the entire length of the mover along the movable direction, all magnets are measured and the average value is taken.
  • the pitch PB between the magnets refers to the distance between two points when the center of the width of one magnet in the movable direction is set as the start point and the center of the width of one adjacent magnet is set as the end point. However, in the case where there are a plurality of identical measurement points in a range completely covering the entire length of the movable element in the movable direction in the movable direction, all of the measurement points are measured and the average value thereof is taken.
  • FIGS. 20 to 23 schematically show (part of) the above evaluation items in each type of linear motor product as an example.
  • FIG. 20 shows a cross section of a moving coil type linear motor with a core.
  • FIG. 21 shows a cross section of a moving magnet type linear motor with a core.
  • FIG. 22 shows a cross section of a coreless moving coil type linear motor.
  • FIG. 23 shows a cross section of a coreless moving magnet type linear motor.
  • the overall length LA of the motor product, the diameter DS of the armature, the teeth widths WT1, WT2, the length LM of the magnet in the motor axis direction, the diameter DR of the field, the pitch between the coils, the length LM of the magnet , And the pitch between the magnets include dimensional errors.
  • tolerance class coarse grade
  • the motor and the motor group according to the embodiment of the present invention can be applied to various driving devices and the like.
  • the driving device may be, for example, a linear motor, a rotary electric motor, a robot having multiple joints, or the like.
  • the present invention can be applied not only to general driving devices such as rotary electric motors and linear motors, but also to magnetic application products using magnets, such as actuators for galvano scanners and magnetic refrigeration devices.
  • FIG. 24 schematically shows a flow of a method for manufacturing a sintered magnet.
  • the manufacturing method of the sintered magnet is as follows. (1) a step of pulverizing a raw material alloy for magnets to obtain magnet material particles (step S110); (2) a step of forming a molded body containing the magnet material particles (step S120); (3) a step of applying a part of an annular magnetic field to the compact to polarize the easy axis of magnetization of the magnet material particles in a polar anisotropic manner (step S130); (4) a step of calcining the molded body to obtain a calcined body (step S140); (5) sintering the calcined body under pressure to obtain a sintered body (step S150); (6) a step of magnetizing the sintered body (step S160); Having.
  • Step S110 First, a raw material alloy for a magnet is finely pulverized to form magnet material particles.
  • the magnet alloy is, for example, a neodymium-iron-boron alloy.
  • the fine pulverization may be performed by, for example, a jet mill pulverizer.
  • the center particle diameter of the magnet material particles after the pulverization treatment is, for example, 1 ⁇ m to 5 ⁇ m.
  • Step S120 Next, the obtained magnet material particles are mixed with a polymer resin to form a kneaded product.
  • a depolymerizable polymer for example, a depolymerizable polymer may be used.
  • examples of such polymers include polyisobutylene (PIB) which is a polymer of isobutylene, polyisoprene (isoprene rubber, IR) which is a polymer of isoprene, polypropylene, and poly ( ⁇ -methyl obtained by polymerizing ⁇ -methylstyrene.
  • Styrene polyethylene, polybutadiene (butadiene rubber, BR) which is a polymer of 1,3-butadiene, polystyrene which is a polymer of styrene, styrene-isoprene block copolymer (SIS) which is a copolymer of styrene and isoprene Butyl rubber (IIR), which is a copolymer of isobutylene and isoprene, styrene-butadiene block copolymer (SBS), which is a copolymer of styrene and butadiene, and styrene-ethylene, which is a copolymer of styrene and ethylene, butadiene Butadiene-styrene copolymer Copolymer (SEBS), styrene-ethylene-propylene-styrene copolymer (SEPS) which is a cop
  • the polymer used as the polymer resin may contain a small amount of a polymer or copolymer of a monomer containing an oxygen atom and / or a nitrogen atom (for example, polybutyl methacrylate or polymethyl methacrylate). However, a polymer containing no oxygen atom and no nitrogen atom is preferred.
  • the polymer resin is added, for example, so that the ratio of the polymer resin to the total amount of the magnet material particles and the polymer resin (referred to as “polymer resin mixed amount”) is 1 wt% to 20 wt%.
  • the amount of the polymer resin mixed is preferably 2 wt% to 15 wt%, more preferably 2 wt% to 10 wt%, and still more preferably 3 wt% to 6 wt%.
  • the obtained kneaded material is molded to form a molded body.
  • Step S130 Next, a part of the annular magnetic field is applied to the compact. Thereby, the axis of easy magnetization of the magnet material particles in the molded body is polar anisotropically oriented.
  • a pulsed magnetic field generator including a multilayer coil and a high-capacity capacitor is used.
  • the polar anisotropic orientation can be realized by instantaneously flowing a current stored in a large-capacity capacitor through a multilayer coil and applying a magnetic field in a direction parallel to a specific cross section.
  • the maximum current at this time is, for example, 8 kA to 16 kA, and the pulse width is, for example, 0.3 ms to 10 ms.
  • the application of the annular pulse magnetic field may be performed a plurality of times.
  • the step of polar anisotropic orientation is performed at a temperature at which the melt viscosity at a temperature of applying a pulsed magnetic field of a mixture of the magnet material particles and the polymer resin is 900 Pas or less, more preferably. Is 700 Pa ⁇ s or less, particularly preferably 300 Pa ⁇ s or less. By setting the pressure to 300 Pa ⁇ s or less, the degree of orientation can be 93% or more even when the number of magnetic field applications is one.
  • the applied pulse magnetic field strength is preferably 2T or more, more preferably 3T or more. By performing the orientation with the magnetic field strength, the degree of orientation can be increased even in the case of a mixture.
  • Step S140 Next, the molded body is preliminarily fired, and the polymer resin component contained in the molded body is removed.
  • the calcination treatment is performed, for example, by heating the molded body to 400 to 600 ° C. in a reducing atmosphere.
  • the reducing atmosphere may contain hydrogen.
  • Step S150 Next, the calcined body is subjected to a sintering process to form a sintered body.
  • the sintering process is performed with the calcined body pressed.
  • the pressure applied to the calcined body is, for example, 3 MPa to 20 MPa.
  • the firing temperature is, for example, in the range of 700 ° C. to 1000 ° C.
  • the direction of the pressure applied to the calcined body is a direction perpendicular to the plane on which a specific cross section is obtained later.
  • the pressure application direction is the Y direction.
  • a hot press sintering method for example, SPS sintering, or the like may be used. According to these methods, the polar anisotropic orientation of the magnet material particles obtained in the above-described steps can be maintained even after sintering.
  • Step S160 Next, the obtained sintered body is magnetized.
  • a magnet such as the sintered magnet 120 can be manufactured.
  • the manufacturing method of the sintered magnet 120 having a substantially rectangular parallelepiped shape has been described above as an example. However, it is obvious to those skilled in the art that the above manufacturing method can be applied to manufacturing of the substantially ring-shaped sintered magnet 220.
  • the pressure sintering process is particularly preferable.
  • FIG. 25 schematically shows one configuration of a jig that can be used for pressure sintering of a ring-shaped calcined body.
  • this jig 900 includes a central mold 910, an upper pin 920, a lower pin 930, and a center rod 940.
  • the center mold 910 is made of graphite, and the upper pin 920, the lower pin 930, and the center rod 940 are made of stainless steel.
  • the ring-shaped calcined body 950 is disposed inside the central mold 910 in a state of being penetrated by the center rod 940.
  • the heating temperature is, for example, in the range of 900 ° C. to 1050 ° C.
  • the upper pin 920 is pressed down at a predetermined pressure, so that the calcined body 950 is pressure-sintered.
  • this jig 900 When using this jig 900, it is preferable to apply a release material in advance to a portion of the jig 900 that comes into contact with the calcined body 950. This facilitates taking out the processed sintered magnet from the jig 900.
  • the release material has a two-layer structure of a first release material and a second release material in the order from farthest from the calcined body 950.
  • the first release material is used to enhance the adhesion between the second release material and the components of the jig 900. Further, the second release material is used to suppress the calcined body 950 from sticking to the member of the jig 900.
  • the first release material contains boron nitride particles and a resin component.
  • the first release material may further include alumina particles.
  • the resin component is added in a range of 15% to 25% based on the total weight of the first release material.
  • the resin component is selected from those having a thermal decomposition start temperature of 180 ° C. or more and 200 ° C. or less and a thermal decomposition end temperature of 250 ° C. or less.
  • the first release material has a shear strength of 10 MPa or more at room temperature.
  • the second release material contains boron nitride particles and a resin component.
  • the resin component is added in the range of 2% to 10% based on the total weight of the second release material.
  • the resin component is selected from those having a thermal decomposition start temperature of 250 ° C. or higher and a thermal decomposition end temperature of 400 ° C. or lower.
  • the second release material has a shear strength of 0.5 MPa or less at room temperature.
  • the amount of the resin component and the thermal decomposition temperature of the resin component can be measured by using Discovery TGA (manufactured by TA Instruments). Specifically, in the absence of a volatile solvent in the release material, the following analysis conditions apply: Sample amount: about 10mg Atmosphere gas: Air container: Platinum container Temperature program: Heating from room temperature to 1000 ° C Heating rate: 10 ° C / min The decomposition start temperature and the decomposition end temperature are calculated with reference to JIS K7120.
  • the temperature at the intersection between the baseline after the start of the measurement and the maximum gradient tangent of the TG curve is defined as the decomposition start temperature
  • the temperature at the intersection of the maximum gradient tangent of the TG curve and the tangent at the weight reduction end area is defined as the decomposition end temperature.
  • the amount of residue at 750 ° C. was defined as ash
  • the weight reduction ratio was defined as the amount of resin component.
  • the void ratio of the obtained sintered magnet can be significantly reduced.
  • the pressure sintering apparatus and method can be applied to a substantially rectangular parallelepiped calcined body. However, in this case, a jig 900 that does not have the center rod 940 shown in FIG. 25 is used.
  • Magnet deviation variation P was evaluated using sintered magnets manufactured by the following method.
  • Example 1 A sintered magnet was manufactured by the above-described manufacturing method.
  • an Nd—Fe—B alloy (Nd: 25.25 wt%, Pr: 6.75 wt%, B: 1.01 wt%, Ga: 0.13 wt%, Nb: 0.2 wt%, Co: 2.0 wt% %, Cu: 0.13 wt%, Al: 0.1 wt%, the balance including Fe and other unavoidable impurities) were finely pulverized to form magnet material particles.
  • a jet mill pulverizer was used for the pulverization. The center particle diameter of the obtained magnet material particles was about 3 ⁇ m.
  • a styrene / butadiene block copolymer (SBS resin) and 1-octadecine and 1-octadecene as oil components were mixed with the obtained magnetic material particles to prepare a kneaded product.
  • the mixing amount of the polymer resin was 4 parts by weight
  • 1-octadecine was 1.5 parts by weight
  • 1-octadecene was 4.5 parts by weight based on 100 parts by weight of the magnetic material particles.
  • the kneaded material was filled in a mold having a size of 21.2 mm in length ⁇ 32 mm in width ⁇ 4.3 mm in thickness, and molded to prepare a molded body.
  • the annular magnetic field was a pulse magnetic field generated by a pulse current.
  • the pulse current was generated by applying a charging voltage of 1300 V to a capacitor (capacity: 1000 ⁇ F) connected to the coil and discharging the capacitor.
  • the pulse width of the pulse current was 0.7 ms, and the pulse current was 12.2 kA.
  • the temperature of the compact after application of the pulsed magnetic field was 120 ° C.
  • the axis of easy magnetization of the magnet material particles contained in the compact was polar anisotropically oriented, and the plane represented by the length and thickness became a specific cross section.
  • the molded body was calcined at 500 ° C. in a 0.8 MPa pressurized hydrogen atmosphere to obtain a calcined body.
  • the obtained calcined body was filled in a graphite mold.
  • this mold was heated to 1000 ° C. while being pressed at 10 MPa, and the calcined body was sintered.
  • a sintered body having a length of 21.2 mm, a width of 16 mm, and a thickness of 4.3 mm was formed. Thereafter, grinding was performed to obtain dimensions of 20 mm in length, 15 mm in width, and 4 mm in thickness.
  • the sintered body was magnetized using the above-mentioned annular magnetic field until the maximum magnetic flux density was substantially saturated.
  • lot A ten sintered magnets
  • FIG. 26 schematically shows the shape of the obtained sintered magnet.
  • the sintered magnet 520 has a first main surface 530 (first surface) and a specific cross section 560.
  • FIG. 26 schematically shows the magnetization direction at the specific cross section 560.
  • a three-dimensional magnetic field vector distribution measuring device (MTX-5R: manufactured by IMS) was used for the measurement. The measurement was performed at 0.004 mm intervals along the measurement line in a horizontal plane 1 mm above the first main surface 530 of the sintered magnet 520, as shown in FIG. The measurement line passes through the center of the sintered magnet 520 in the width (Y) direction and is parallel to the length (X) direction.
  • the measurement was performed with the sintered magnet fixed using a non-magnetic material so as not to affect the surface magnetic flux density.
  • the measured surface magnetic flux density is obtained by measuring a component in a direction normal to the locus of the measurement line.
  • FIG. 27 collectively shows the measurement results obtained for the ten sintered magnets.
  • the horizontal axis represents each position on the measurement line, and the zero point corresponds to the center of the sintered magnet 520 in the length (X) direction.
  • Example 2 In the same manner as in Example 1, ten sintered magnets (hereinafter referred to as "lot B") were manufactured, and the characteristics of each sintered magnet were evaluated.
  • lot B ten sintered magnets
  • FIG. 28 collectively shows the measurement results obtained for the ten sintered magnets included in lot B.
  • Example 3 In the same manner as in Example 1, ten sintered magnets (hereinafter referred to as “lot C”) were manufactured, and the characteristics of each sintered magnet were evaluated.
  • FIG. 29 summarizes the measurement results obtained for the ten sintered magnets included in lot C.
  • Example 4 In the same manner as in Example 1, ten sintered magnets (hereinafter referred to as "lot D") were manufactured, and the characteristics of each sintered magnet were evaluated.
  • lot D ten sintered magnets
  • FIG. 30 summarizes the measurement results obtained for the ten sintered magnets included in lot D.
  • Example 5 A sintered magnet was manufactured by the following method.
  • an Nd—Fe—B alloy (Nd: 23.45 wt%, Pr: 6.75 wt%, Dy: 1.80 wt% B: 1.01 wt%, Ga: 0.13 wt%, Nb: 0.2 wt% , Co: 2.0 wt%, Cu: 0.13 wt%, Al: 0.1 wt%, the balance including Fe and other unavoidable impurities) to form magnet material particles.
  • a jet mill pulverizer was used for the pulverization. The center particle diameter of the obtained magnet material particles was about 3 ⁇ m.
  • a styrene / butadiene block copolymer (SBS resin) and 1-octadecine and 1-octadecene as oil components were mixed with the obtained magnetic material particles to prepare a kneaded product.
  • the mixing amount of the polymer resin was 4 parts by weight
  • 1-octadecine was 1.5 parts by weight
  • 1-octadecene was 4.5 parts by weight based on 100 parts by weight of the magnetic material particles.
  • the kneaded product was filled into a mold having a size of 29.8 mm in outer diameter ⁇ 25.2 mm in inner diameter ⁇ 30 mm in width (axial length), and was molded to prepare a ring-shaped molded body.
  • the annular magnetic field was a pulse magnetic field generated by a pulse current.
  • the pulse current was generated by applying a charging voltage of 2550 V to a capacitor (capacity: 1000 ⁇ F) connected to the coil and discharging the capacitor.
  • the pulse width of the pulse current was 0.7 ms, and the pulse current was 11.9 kA.
  • the temperature of the compact after application of the pulsed magnetic field was 120 ° C.
  • the coil was installed outside the ring-shaped molded body so as to be parallel to the axial direction.
  • the axis of easy magnetization of the magnetic material particles contained in the compact was polar anisotropically oriented.
  • the molded body was polar anisotropically oriented so as to have eight magnetic poles on the outer diameter side.
  • the specific cross section of the molded body is a cross section perpendicular to the axial length direction.
  • the molded body was calcined at 500 ° C. in a 0.8 MPa pressurized hydrogen atmosphere to obtain a calcined body.
  • a release material was spray-applied to the central mold 910, the upper pin 920, the lower pin 930, and the center rod 940, at locations where they could come into contact with the calcined body.
  • the release material had a two-layer structure of the above-described first release material and second release material. Note that the release material was installed such that the side of the second release material was in contact with the calcined body.
  • the calcined body was pressed at a pressure of 10.5 MPa along the axial direction by the upper pin 920 and the lower pin 930.
  • the jig 900 was heated to 980 ° C. and held for 30 minutes to sinter the calcined body.
  • a ring-shaped sintered body having an outer diameter of 29.8 mm, an inner diameter of 23.8 mm, and a shaft length of 15 mm was formed.
  • This sintered body was heat-treated at 1000 ° C. for 7 hours, and then further heat-treated at 480 ° C.
  • the sintered body was magnetized using the above-mentioned annular magnetic field until the maximum magnetic flux density was substantially saturated.
  • slot E sintered magnets
  • each sintered magnet included in the lot E has a ring shape, and the first main surface is an outer peripheral surface. Therefore, a position 1 mm away from the outer peripheral surface of the sintered magnet was set as a measurement line, and the measurement was performed along this measurement line.
  • the measurement interval is 0.04 °.
  • the void fraction was measured as follows using a measurement device FINE SAT III (FS200III) (manufactured by Hitachi Power Solutions, Ltd.).
  • a sample for measuring the void fraction was prepared from the sintered magnet.
  • the ring-shaped sintered magnet is cut in a direction parallel to the specific cross section, and a ring-shaped sample having a width of 4 mm is collected from a substantially central portion along the axial direction of the sintered magnet (direction of width W in FIG. 8). did.
  • the sample was set on the measuring device, and the measurement was performed under the following conditions and operating method.
  • ⁇ ⁇ ⁇ ⁇ 50P6F15 (frequency 50 MHz, focal length 16 mm, working distance 15 mm) was used as a probe.
  • the focus of the probe was set at the center of the sample in the width direction, and measurement was performed by a reflection method.
  • an F gate having a gate width of 200 ns is set at the center between the surface echo and the echo from the sample bottom surface.
  • the Z-axis coordinate of the probe is intermediate between the Z-axis coordinate at which the surface echo is maximized and the Z-axis coordinate of the probe at which the echo from the sample bottom is maximized so that the sample is focused on the central portion in the width direction. Adjusted to height.
  • the height (trigger) of the S gate was adjusted to an extent not affected by noise. The measurement was performed at every 50 ⁇ m pitch, and speed priority was selected as the scanning mode.
  • the energy applied to the probe is 50 V
  • the pulse repetition frequency (PRF) is 10 kHz
  • the high-pass filter is 10 MHz
  • the low-pass filter is 140 MHz
  • the depth data is a trigger point
  • the image to be displayed was a standard video (Std), and the brightness of the image displayed by the color bar was set to 6 for High, 0 for Low, and 0 for Bright.
  • the void area ratio was calculated from the obtained image using image analysis software (ImageJ). A portion having a luminance of 120 or more was identified as a void.
  • the outer and inner peripheral surfaces of the sample may be affected in various ways during the manufacturing process of the sintered magnet. For this reason, the area ratio was calculated excluding the portion at a depth of 500 ⁇ m from the outer peripheral surface of the sample and the portion at a depth of 500 ⁇ m from the inner peripheral surface of the sample.
  • FIG. 31 shows an example of the obtained image. It was found that the sintered magnet included in lot E had few voids.
  • Example 6 A sintered magnet was manufactured by the following method.
  • an Nd—Fe—B alloy (Nd: 23.45 wt%, Pr: 6.75 wt%, Dy: 1.80 wt% B: 1.01 wt%, Ga: 0.13 wt%, Nb: 0.2 wt% , Co: 2.0 wt%, Cu: 0.13 wt%, Al: 0.1 wt%, the balance including Fe and other unavoidable impurities) to form magnet material particles.
  • a jet mill pulverizer was used for the pulverization. The center particle diameter of the obtained magnet material particles was about 3 ⁇ m.
  • a styrene / butadiene block copolymer (SBS resin) and 1-octadecine and 1-octadecene as oil components were mixed with the obtained magnetic material particles to prepare a kneaded product.
  • the mixing amount of the polymer resin was 4 parts by weight
  • 1-octadecine was 1.5 parts by weight
  • 1-octadecene was 4.5 parts by weight based on 100 parts by weight of the magnetic material particles.
  • the kneaded material was filled into a mold having a size of 21.2 mm in length ⁇ 32 mm in width ⁇ 4.3 mm in thickness, and molded to prepare a molded body.
  • the annular magnetic field was a pulse magnetic field generated by a pulse current.
  • the pulse current was generated by applying a charging voltage of 1650 V to a capacitor (capacity: 1000 ⁇ F) connected to the coil and discharging the capacitor.
  • the pulse width of the pulse current was 0.7 ms, and the pulse current was 12.5 kA.
  • the temperature of the compact after application of the pulsed magnetic field was 120 ° C.
  • the coil was installed so as to be parallel to the width direction of the rectangular solid.
  • the specific cross section of the molded body is a direction parallel to a plane formed by the length and the thickness.
  • the molded body was calcined at 500 ° C. in a 0.8 MPa pressurized hydrogen atmosphere to obtain a calcined body.
  • This device does not have the center rod 940 like the jig 900, and is constituted by a center type, an upper pin and a lower pin.
  • a rectangular parallelepiped sintered body having a length of 21.2 mm, a width of 16 mm, and a thickness of 4.3 mm was formed.
  • This sintered body was heat-treated at 1000 ° C. for 7 hours, and then further heat-treated at 480 ° C. Thereafter, grinding was performed to obtain dimensions of 20 mm in length, 15 mm in width, and 4 mm in thickness.
  • the sintered body was magnetized using the above-mentioned annular magnetic field until the maximum magnetic flux density was substantially saturated.
  • lot F rectangular parallelepiped sintered magnets
  • Example 11 The same evaluation as in Example 1 was carried out using five commercially available ring-shaped sintered magnets. A quadrupole anisotropic magnet was used as the sintered magnet.
  • FIG. 32 schematically shows the shape of the sintered magnet used.
  • the sintered magnet 620 has a first main surface 630 (outer peripheral surface) and a specific cross section 660 (upper surface).
  • FIG. 32 schematically shows the magnetization direction at the specific cross section 660.
  • Example 11 the surface magnetic flux density was measured along the measurement line substantially at the center of the width (Y) direction of each sintered magnet 620, and the deviation P between magnets was calculated from the obtained result. .
  • the measurement line was a circumference 1 mm away from the outer peripheral surface 630 of the sintered magnet 620, and the measurement interval was 0.04 °.
  • the deviation P between the magnets was about 4.9%.
  • the average of the void fraction measured by the method described above was 8.1%.
  • FIG. 33 shows an example of the obtained image. As is clear from FIG. 33, many voids were observed in the sintered magnet 620.
  • Example 12 The same evaluation as in Example 1 was performed using three commercially available ring-shaped sintered magnets. A radial anisotropic magnet was used as the sintered magnet.
  • FIG. 34 schematically shows the shape of the sintered magnet used.
  • the sintered magnet 720 has a first main surface 730 (outer peripheral surface) and a specific cross section 760 (upper surface).
  • FIG. 34 schematically shows the magnetization direction in the specific cross section 760.
  • the outer diameter (maximum dimension in the X direction) of the sintered magnet 720 is 43.1 mm, and the thickness (distance between the outer peripheral surface and the inner peripheral surface) is 2.2 mm.
  • the width (dimension in the Y direction) is 39.2 mm.
  • the deviation P between the magnets was about 7.4%.
  • Example 13 The same evaluation as in Example 1 was performed using ten commercially available ring-shaped sintered magnets. A 4-pole anisotropic magnet was used as the sintered magnet.
  • FIG. 35 shows an example of the obtained image. As is clear from FIG. 35, many voids were observed in the sintered magnet.
  • the number of motors was set to 10, and it was assumed that one sintered magnet was attached to each motor.
  • the sintered magnet attached to each motor was a ring-shaped sintered magnet 220 having quadrupolar anisotropy as shown in FIGS. 8 and 9 described above.
  • ⁇ , ⁇ D, and ⁇ G are parameters relating to characteristic variations that occur when magnetizing the magnet compact.
  • FIG. 36 schematically shows the device configuration of the magnetizing process used in the simulation.
  • FIG. 37 is a schematic enlarged view of a portion surrounded by a thick frame in FIG.
  • the device 800 includes a sleeve 810, a coil 818, and a yoke 870.
  • the sleeve 810 functions as a “mold” for installing the magnet compact 821.
  • the sleeve 810 is a magnetic ring and has a center equal to the center H of the device 800.
  • the four coils 818 are provided around the sleeve 810 at substantially equal intervals (approximately 90 ° intervals) about the center H as the rotation center.
  • an air region 819 exists between the coil 818 and the sleeve 810.
  • the yoke 870 is installed so as to surround the sleeve 810 and the coil 818.
  • the above-mentioned parameter ⁇ is an angle between a horizontal straight line passing through the center H of the device 800 and the stretching axis M passing through the center H of the left coil 818 during the magnetization process. Represent.
  • ⁇ D is, as shown in FIG. 37, when the maximum dimension of the air region 819 existing between the left coil 818 and the sleeve 810 in the direction of the extension axis M of the coil 818 is D.
  • ⁇ D D ⁇ D 0 It is represented by
  • D 0 represents the ideal maximum dimension of the air region 819 in the direction of the stretching axis M of the coil 818.
  • ⁇ G represents a deviation from the complete (100%) magnetization of the magnet green compact due to the magnetizing process.
  • G is the actual magnetic susceptibility.
  • ⁇ G is a secondary parameter caused by the variation in the current value.
  • ⁇ x and ⁇ y are parameters representing the deviation of the center axis of the sintered magnet obtained after magnetization from the center axis of the ideal sintered magnet. That is, ⁇ x represents a shift of the center axis of the sintered magnet with respect to the ideal sintered magnet in the x direction, and ⁇ y represents a shift of the center axis of the sintered magnet with respect to the ideal sintered magnet in the y direction.
  • Electromagnetic field analysis software JMAG-Designer: version 16.1.03k was used for the simulation.
  • the sintered magnet was a neodymium magnet.
  • FIG. 38 shows the evaluation results of the simulation.
  • the horizontal axis represents the deviation variation P [%] between the magnets.
  • the vertical axis indicates the cogging torque width ⁇ T [mN ⁇ m].
  • the cogging torque width ⁇ T [mN ⁇ m] is the cogging torque value (K max ) of the motor where the largest cogging torque is generated and the cogging torque value (K min ) of the motor where the smallest cogging torque is generated. ).
  • the cogging torque width ⁇ T in the third device tends to decrease as the deviation P between the magnets decreases.
  • the cogging torque width ⁇ T can be suppressed to about 2.5 mN ⁇ m or less when the magnet deviation variation P ⁇ 4%.
  • the number of motor products was 30 and it was assumed that one sintered magnet was attached to each motor product.
  • the sintered magnet attached to each motor product was a ring-shaped sintered magnet 220 having quadrupolar anisotropy as shown in FIGS. 8 and 9 described above.
  • the configuration used for the simulation is referred to as a “fourth device”.
  • ⁇ , ⁇ D, and ⁇ G are parameters relating to characteristic variations that occur during the magnetization process on the compound.
  • the device 800 includes a sleeve 810, a coil 818, and a yoke 870.
  • the sleeve 810 functions as a “mold” for installing the compound 821.
  • the sleeve 810 is a ring of a magnetic material and has a center equal to the center H of the device 800.
  • the four coils 818 are provided around the sleeve 810 at substantially equal intervals (approximately 90 ° intervals) about the center H as the rotation center.
  • an air region 819 exists between the coil 818 and the sleeve 810.
  • the yoke 870 is installed so as to surround the sleeve 810 and the coil 818.
  • the above-mentioned parameter ⁇ is an angle between a horizontal straight line passing through the center H of the device 800 and the stretching axis M passing through the center H of the left coil 818 during the magnetization process. Represent.
  • ⁇ D is, as shown in FIG. 37, when the maximum dimension of the air region 819 existing between the left coil 818 and the sleeve 810 in the direction of the extension axis M of the coil 818 is D.
  • ⁇ D D ⁇ D 0 It is represented by
  • D 0 represents the ideal maximum dimension of the air region 819 in the direction of the stretching axis M of the coil 818.
  • ⁇ G represents a deviation from perfect (100%) magnetization of the sintered magnet due to the magnetizing treatment.
  • G is the actual magnetic susceptibility.
  • ⁇ x and ⁇ y are parameters representing the deviation of the center axis of the sintered magnet obtained after magnetization from the center axis of the ideal sintered magnet. That is, ⁇ x represents a shift of the center axis of the sintered magnet with respect to the ideal sintered magnet in the x direction, and ⁇ y represents a shift of the center axis of the sintered magnet with respect to the ideal sintered magnet in the y direction.
  • the simulation is Simulation of variation in orientation of easy axis of magnetization with respect to I compound, II Simulation of variation during magnetization of sintered magnets, and III Simulation of variation of cogging torque in motor products, was carried out in the flow of
  • Electromagnetic field analysis software JMAG-Designer: version 16.1.03k was used for the simulation. Two-dimensional static analysis was used for I and II calculations, and two-dimensional transient response analysis was used for III calculations.
  • the compound 821 has dimensions of an outer circumference of 15 mm ⁇ and a thickness of 5.6 mm (inner circumference of 3.8 mm ⁇ ).
  • initial magnetization curve (BH) data actually measured using a measuring device such as a pulse excitation type magnetic property measuring device or a BH curve tracer is assigned.
  • the sleeve 810 was made of carbon steel S45C having an outer circumference of 25 mm ⁇ and an inner circumference of 7.5 mm ⁇ (thickness t5 mm).
  • the yoke 870 had an outer circumference of 100 mm ⁇ , a thickness t of 37.5 mm (inner circumference of 25 mm ⁇ ), and a magnetic material of SS400.
  • a coil 818 exists inside the yoke 870.
  • the coil 818 has a width of 11.2 mm in parallel with the horizontal straight line passing through the center H or the stretching axis M as a center line, and the horizontal straight line or the stretching axis M Has a depth of 20 mm in a direction perpendicular to the vertical direction.
  • a fillet having a radius of 2.8 mm was formed at a corner of the coil region.
  • the number of turns was set to 52 turns per coil.
  • the air region 819 existing between the coil 818 and the sleeve 810 has a width of 5.1 mm in parallel with the horizontal straight line or the stretching axis M of the coil 818 as a center line, and has a direction of the horizontal straight line or the stretching axis M.
  • ideal time of the maximum dimension D 0 in is 0.5mm.
  • the sintered magnet 220 has an outer circumference of 10.0 mm ⁇ , a width W of 25 mm, and a thickness of 2.25 mm (inner circumference of 5.5 mm ⁇ ), and allocates magnet material data created by the previous magnetization process.
  • the relative positions of the center H in FIG. 36 and the center C in FIG. 9 are changed by changing the aforementioned ⁇ x and ⁇ y parameters to obtain the sintered magnet 220 having a different surface magnetic flux waveform. Data obtained.
  • the stator of the motor product has a cylindrical shape with an outer circumference of 21 mm ⁇ , an inner circumference of 10.3 mm ⁇ , and a laminated thickness of 25 mm, and is arranged concentrically with the sintered magnet.
  • the stator has six slots for installing coils inside and six teeth for winding the coils alternately at an equal angle.
  • the depth of the slot is 17 mm ⁇ , and the width of the teeth at the portion from the slot depth side of the stator toward the center point C is uniformly 3.1 mm.
  • the teeth are configured such that the width of the center-side tip is wide, and the gap between the adjacent teeth tips is arranged so that the angle passing through the motor center point is 14 degrees.
  • the center end portion of the tooth thickness of 3.1 mm is located on a circumference having a diameter of 12.4 mm ⁇ with respect to the center coordinate of the motor.
  • the angle at which the side of the tooth thickness of 3.1 mm extends toward the tip of the tooth with the center end as the base point is 137 °.
  • Six such teeth shapes are arranged on the stator at equal intervals in the circumferential direction, symmetrically to the left and right.
  • the stator was made of magnetic steel plate 50H700, the shaft was made of carbon steel S45C, and the coil was made of copper.
  • the setting of the number of turns of the coil 218 is arbitrary.
  • the number of analysis steps was set to 61 steps, and the rotor was set to rotate 1 ° per step.
  • the number of gap divisions was four in the radial direction and 720 in the circumferential direction.
  • the number of elements is 34,938 and the number of nodes is 19,294.
  • one surface magnetic flux density and one cogging torque value are associated with one sintered magnet.
  • FIG. 40 shows the evaluation results of the simulation.
  • the horizontal axis represents the deviation variation P [%] between the magnets.
  • the vertical axis indicates the average of the harmonic amplitude ratio.
  • the “harmonic amplitude ratio” is one of the parameters obtained by performing a Fourier transform on the cogging torque value in a range of 360 °.
  • the amplitude is separated into specific harmonic components.
  • the type of the motor product is an N-pole M-slot
  • an amplitude peak occurs at the position of the order M and at the position of the order represented by the least common multiple of M and N.
  • the former peak is caused by variations in magnets, and is called a stator periodic component.
  • the latter peak is called a cogging fundamental wave due to the structure of the motor product.
  • The“ harmonic amplitude ratio ”on the vertical axis is expressed as a ratio of both peaks, that is, a stator period component / cogging fundamental wave. Therefore, the “average of the harmonic amplitude ratio” is represented by the average of the harmonic amplitude ratio in the target motor product.
  • each motor product is provided with four sintered magnets.
  • the sintered magnet mounted on each motor product was a segmented sintered magnet obtained by dividing the ring into quarters.
  • the configuration used for the simulation is referred to as “fifth device”.
  • ⁇ x and ⁇ y were assumed as factors affecting the variation in the surface magnetic flux density characteristics of 4 ⁇ 30 sintered magnets.
  • ⁇ x and ⁇ y are parameters that give variation to the focal coordinates of the radial orientation. These parameters were varied to produce characteristic variations among the 4 ⁇ 30 sintered magnets. At that time, a population with a small variation in surface magnetic flux density and a population with a large variation were created. In addition, a simulation was used to evaluate the relationship between the deviation P between the magnets among 4 ⁇ 30 sintered magnets randomly extracted from each population and the cogging torque generated in 30 motor products. .
  • the simulation is I Simulation of characteristic variation in sintered magnets, and II Simulation of cogging torque variation in motor products, It was carried out in the flow of.
  • the sintered magnet used has a segment shape obtained by dividing a ring having an outer circumference of 19 mm ⁇ and a thickness of 3.5 mm (inner circumference of 12 mm ⁇ ) into quarters.
  • a segment shape obtained by dividing a ring having an outer circumference of 19 mm ⁇ and a thickness of 3.5 mm (inner circumference of 12 mm ⁇ ) into quarters.
  • four corners are chamfered by 1 mm square.
  • the center point corresponding to the outer circumference or inner circumference of the magnet is defined as the origin coordinates (0, 0), and the coordinates (13, 13) are used as the reference focal coordinates. That is, it is assumed that the direction of the easy axis of magnetization in the magnet is oriented in a direction converging on the coordinates (13, 13).
  • the surface magnetic flux density is measured along the measurement line, and the deviation P between the magnets is calculated from the obtained result.
  • the measurement line in the sintered magnet is defined as a first main surface on the side opposite to the focal coordinates, and a Y-axis from the X axis on a concentric circle 1 mm away from the first main surface toward the focal coordinates. It means the range from 0 ° to 90 ° to the axis.
  • the stator core of the motor product has a cylindrical shape with an outer circumference of 42 mm ⁇ , an inner circumference of 20.4 mm ⁇ , and a laminated thickness of 23 mm, and is arranged concentrically with the sintered magnet.
  • the stator core On the stator core, six slots for installing the coils inside and six teeth for winding the coils are alternately formed at an equal angle.
  • the depth dimension of the slot is 34 mm ⁇ , and the width of the teeth at the portion from the slot depth side of the stator toward the center point C is 6.2 mm in thickness.
  • the teeth are configured such that the width of the center-side tip is wide, and the gap between the adjacent teeth tips is arranged so that the angle passing through the motor center point is 14 degrees.
  • the center-side end portion of the tooth thickness of 6.2 mm is located on a circumference having a diameter of 24.8 mm ⁇ with the center point of the motor center coordinate.
  • the angle at which the side of the tooth thickness of 6.2 mm expands toward the tip of the tooth with the center end as the base point is 137 °.
  • Six such teeth shapes are arranged on the stator at equal intervals in the circumferential direction, symmetrically to the left and right.
  • the rotor is composed of a shaft at the center of the motor product, a sintered magnet on the outer diameter side of the rotor, and a rotor core of a magnetic material between the shaft and the sintered magnet.
  • the rotor core has an outer circumference of 12 mm ⁇ and an inner circumference of 6 mm ⁇ , and is provided with a total of four protrusions at a distance of 9 mm from the center of the motor so as to fill the gap between the sintered magnets.
  • the stator core and the rotor core were made of electromagnetic steel plate 50A700, the shaft was made of carbon steel S45C, and the coil was made of copper.
  • the setting of the number of turns of the coil is arbitrary.
  • the number of analysis steps was set to 61 steps, and the rotor was set to rotate 1 ° per step.
  • the number of gap divisions was four in the radial direction and 720 in the circumferential direction.
  • the number of elements is 43,395 and the number of nodes is 23,218.
  • the sintered magnet patterns having various different surface magnetic flux densities are assigned to the four sintered magnets of the motor product, and the calculation is performed, and the maximum peak point and the minimum peak point of the output cogging torque waveform are calculated. The difference is registered as a cogging torque value of the motor product.
  • the focus position pattern of the sintered magnet shown in FIG. 41 is a pattern example corresponding to the sintered magnet located in the first quadrant of the sintered magnet in the motor of FIG. Therefore, when the positions of the sintered magnets are different from those of the second, third, and fourth quadrants, a pattern in which the respective coordinates are rotated and moved by 90 ° is assigned.
  • FIG. 43 shows the evaluation results of the simulation.
  • the horizontal axis indicates the deviation P [%] between the magnets.
  • the vertical axis indicates the average of the harmonic amplitude ratio.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne une pluralité de produits de moteur identiques disponibles dans le commerce, dans laquelle : il existe au moins 30 des produits de moteur ; chacun des produits de moteur comprend un ou plusieurs aimants ; chacun des aimants a un taux de vide inférieur ou égal à 7 % ; chacun des aimants est un aimant fritté ayant une région non alignée en parallèle, et a une première surface principale à laquelle la valeur de crête de l'induction magnétique de surface est à son maximum ; et lorsque l'induction magnétique de surface est mesurée le long d'une ligne de mesure sur la première surface principale de chacun des aimants, la variation d'écart entre les aimants P représentée par la formule suivante : variation d'écart entre les aimants P [%] = (σtotal[mT]/Atotal[mT]) × 100 est inférieure ou égale à 4 %.
PCT/JP2019/038981 2018-10-04 2019-10-02 Pluralité de produits de moteur, moteur, groupe de moteurs, dispositif d'entraînement et groupe d'aimants WO2020071446A1 (fr)

Priority Applications (1)

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CN201980064493.6A CN112789788A (zh) 2018-10-04 2019-10-02 多个马达产品、马达、马达组、驱动装置、及磁铁组

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JP2019181588A JP2020078231A (ja) 2018-10-04 2019-10-01 複数のモータ製品、モータ、モータ群、駆動装置、および磁石群
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Cited By (1)

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JP2022078952A (ja) * 2020-11-13 2022-05-25 コマディール・エス アー 携行型時計用磁石、特に、ネオジム－鉄－ホウ素磁石、のための耐腐食保護

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JPH11178254A (ja) * 1997-12-05 1999-07-02 Toshiba Corp 永久磁石形モータ
JP2004343822A (ja) * 2003-05-13 2004-12-02 Matsushita Electric Ind Co Ltd モータ駆動装置および洗濯乾燥機のモータ駆動装置
WO2016152979A1 (fr) * 2015-03-24 2016-09-29 日東電工株式会社 Corps fritté pour la formation d'un aimant en terres rares et aimant fritté en terres rares
JP2017070100A (ja) * 2015-09-30 2017-04-06 ファナック株式会社 ロータにおける磁石の配置位置を学習する機械学習装置および方法ならびに該機械学習装置を備えたロータ設計装置
WO2018047211A1 (fr) * 2016-09-09 2018-03-15 株式会社 東芝 Aimant permanent, machine électrique rotative et véhicule

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Publication number Priority date Publication date Assignee Title
JPH11178254A (ja) * 1997-12-05 1999-07-02 Toshiba Corp 永久磁石形モータ
JP2004343822A (ja) * 2003-05-13 2004-12-02 Matsushita Electric Ind Co Ltd モータ駆動装置および洗濯乾燥機のモータ駆動装置
WO2016152979A1 (fr) * 2015-03-24 2016-09-29 日東電工株式会社 Corps fritté pour la formation d'un aimant en terres rares et aimant fritté en terres rares
JP2017070100A (ja) * 2015-09-30 2017-04-06 ファナック株式会社 ロータにおける磁石の配置位置を学習する機械学習装置および方法ならびに該機械学習装置を備えたロータ設計装置
WO2018047211A1 (fr) * 2016-09-09 2018-03-15 株式会社 東芝 Aimant permanent, machine électrique rotative et véhicule

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022078952A (ja) * 2020-11-13 2022-05-25 コマディール・エス アー 携行型時計用磁石、特に、ネオジム－鉄－ホウ素磁石、のための耐腐食保護
JP7232302B2 (ja) 2020-11-13 2023-03-02 コマディール・エス アー 携行型時計用磁石、特に、ネオジム－鉄－ホウ素磁石、のための耐腐食保護
US12012651B2 (en) 2020-11-13 2024-06-18 Comadur Sa Corrosion-inhibiting protection for watch magnets, in particular neodymium-iron-boron magnets

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