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WO2018230436A1 - Machine électrique rotative - Google Patents

Machine électrique rotative Download PDF

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Publication number
WO2018230436A1
WO2018230436A1 PCT/JP2018/021871 JP2018021871W WO2018230436A1 WO 2018230436 A1 WO2018230436 A1 WO 2018230436A1 JP 2018021871 W JP2018021871 W JP 2018021871W WO 2018230436 A1 WO2018230436 A1 WO 2018230436A1
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WO
WIPO (PCT)
Prior art keywords
permanent magnet
thickness
rotor
face
axial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/021871
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English (en)
Japanese (ja)
Inventor
平野　正樹
善紀 安田
祥孝 奥山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of WO2018230436A1 publication Critical patent/WO2018230436A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a rotating electric machine.
  • a laminated core made by stacking core members formed by punching electromagnetic steel sheets is adopted as the rotor core, and a skew structure is adopted for the laminated core to reduce cogging torque.
  • a laminated core made by stacking core members formed by punching electromagnetic steel sheets is adopted as the rotor core, and a skew structure is adopted for the laminated core to reduce cogging torque.
  • the present invention has been made paying attention to the above-mentioned problem, and an object of the present invention is to take measures against demagnetization while suppressing an increase in cost in a rotating electrical machine including a rotor having permanent magnets.
  • the first aspect is In a rotating electric machine having a stator (10) and a rotor (20),
  • the stator (10) has a plurality of teeth (13) that function as electromagnets
  • the rotor (20) has a plurality of permanent magnets (26) skewed according to the axial position of the rotor (20),
  • Each permanent magnet (26) has a circumferential center (Mc) of an axial orthogonal section (F0) at the axial center of the permanent magnet (26) on the magnetic pole center line (L) of a predetermined tooth (13).
  • the permanent magnet (26) is formed so that the thickness of the portion to which a larger reverse magnetic field acts is thicker than other portions.
  • the second aspect is the first aspect,
  • the permanent magnet (26) is a rotating electric machine characterized by being a bonded magnet.
  • the third aspect is the first or second aspect,
  • the thicker one of the circumferential end portions of the magnetic pole is such that the thickness continuously decreases from the axial end surface toward the axial center. It is a rotating electric machine characterized by changing.
  • the permanent magnet (26) is set to have a larger thickness with respect to a portion where the magnitude of the acting reverse magnetic field is larger.
  • the portion of the permanent magnet (26) that needs countermeasures against demagnetization is set to an appropriate thickness.
  • the fourth aspect is the first or second aspect
  • the thicker one of the portions in the circumferential direction of the magnetic pole is such that the thickness gradually decreases from the end surface in the axial direction toward the center in the axial direction. It is a rotating electric machine characterized by changing.
  • the permanent magnet (26) is set to have a larger thickness with respect to a portion where the magnitude of the acting reverse magnetic field is larger.
  • the fifth aspect is any one of the first to fourth aspects.
  • the permanent magnet (26) is a rotating electric machine characterized in that the thickness does not change in a predetermined axial direction range from the axial center.
  • the first aspect it is possible to take measures against demagnetization while suppressing an increase in cost in a rotating electric machine including a rotor having permanent magnets.
  • the use of the bonded magnet makes it possible to easily set the thickness of the permanent magnet.
  • the thickness of the permanent magnet changes stepwise, a so-called sintered magnet can be easily employed as the permanent magnet of the rotor.
  • the types of core members that form the rotor can be reduced, and the manufacture becomes easier.
  • the fifth aspect by providing the portion where the thickness does not change, when the rotor is formed using a so-called laminated core, the types of core members that form the rotor can be reduced. Manufacturing becomes easier.
  • FIG. 1 shows an electric motor according to Embodiment 1 of the present invention.
  • FIG. 2 is a plan view of the rotor as viewed from the axial direction.
  • FIG. 3 shows a longitudinal sectional view of the rotor.
  • FIG. 4 is a plan view showing an example of the core member.
  • FIG. 5 shows a central section of the permanent magnet.
  • FIG. 6 shows the first end face of the rotor in the facing state.
  • FIG. 7 shows the second end face of the rotor in the directly-facing state.
  • FIG. 8 is a perspective view of a permanent magnet.
  • FIG. 9 is a perspective view of a permanent magnet according to a modification of the first embodiment.
  • FIG. 10 is a plan view of the rotor according to the second embodiment viewed from the axial direction.
  • FIG. 11 is a plan view of a rotor according to a modification of the second embodiment viewed from the axial direction.
  • FIG. 1 shows an electric motor (1) according to Embodiment 1 of the present invention.
  • the electric motor (1) is an example of a rotating electric machine.
  • the electric motor (1) is a magnet-embedded electric motor, and includes a stator (10), a rotor (20), a drive shaft (30), and a casing (2) as shown in FIG. .
  • the axial direction means the direction of the axis of the drive shaft (30)
  • the radial direction means a direction orthogonal to the axial direction.
  • the outer peripheral side means the side far from the axis
  • the inner peripheral side means the side close to the axis.
  • the stator (10) includes a cylindrical stator core (11) and a coil (16).
  • the stator core (11) is a so-called laminated core, and is configured by laminating a plurality of plate-like members formed by punching electromagnetic steel sheets by a press machine in the axial direction.
  • the stator core (11) includes one back yoke portion (12), a plurality of (in this example, nine) teeth (13), and a plurality of brim portions (14).
  • the stator core (11) is fitted and fixed to the casing (2) so that the outer peripheral surface of the back yoke portion (12) is in contact with the inner peripheral surface of the casing (2).
  • the back yoke portion (12) is an annular portion in a plan view on the outer peripheral side of the stator core (11).
  • Each tooth (13) is a rectangular parallelepiped portion extending in the radial direction in the stator core (11).
  • a coil (16) is wound around each tooth (13) by, for example, a concentrated winding method.
  • a space between adjacent teeth (13) functions as a coil slot (15) for accommodating the coil (16).
  • an electromagnet is configured in each tooth (13).
  • the brim portion (14) is a portion that protrudes on both sides continuously from the inner peripheral side of each tooth (13). Therefore, the brim portion (14) is formed to have a width (length in the circumferential direction) larger than that of the teeth (13).
  • the collar portion (14) has a cylindrical surface on the inner peripheral side, and the cylindrical surface faces the outer peripheral surface (cylindrical surface) of the rotor (20) with a predetermined distance (air gap (G)). Yes.
  • FIG. 2 shows a plan view of the rotor (20) viewed from the axial direction. Moreover, in FIG. 3, the longitudinal cross-sectional view of a rotor (20) is shown. FIG. 3 corresponds to the II-II cross section of FIG.
  • end plates for example, disc-shaped members formed using a non-magnetic material such as stainless steel
  • end plates are provided at both axial ends of the rotor (20). Etc., the illustration of the end plate is omitted.
  • the rotor (20) includes a rotor core (21) and six permanent magnets (26). That is, the rotor (20) includes six magnetic poles. These permanent magnets (26) are so-called bonded magnets.
  • the bond magnet is a permanent magnet formed by mixing a fine powdery or granular ferrite magnet or rare earth magnet, which is a magnet material, with a binder such as nylon resin or PPS resin and solidifying it. In such a bonded magnet, a non-magnetic powder or granular magnet material and a binder are mixed in the magnet slot (24) of the rotor core (21) when the rotor (20) is manufactured. It is formed by supplying a bond magnet material (more specifically, injection molding) and magnetizing it. The permanent magnet (26) thus formed penetrates the rotor core (21) in the axial direction.
  • the rotor core (21) is a so-called laminated core having a skew structure as will be described in detail later. Specifically, the rotor core (21) is laminated in the axial direction with a plurality of core members (22) formed by punching a magnetic steel sheet having a thickness of, for example, 0.3 to 0.5 mm by a press machine. Configured.
  • FIG. 4 is a plan view showing an example of the core member (22) in the present embodiment.
  • the core member (22) has a through hole (25) for forming a magnet slot (24) described later.
  • a large number of core members (22) are laminated, and the core members (22) are joined by caulking to form a cylindrical rotor core (21).
  • the electrical steel sheet which is a raw material of this core member (22) is insulation-coated from a viewpoint which suppresses generation
  • magnet slots (24) for accommodating the permanent magnets (26) are arranged at a 60 ° pitch around the axis (O) of the rotor core (21). Yes. These magnet slots (24) penetrate the rotor core (21) in the axial direction, and the cross-sectional shape thereof matches the shape of the permanent magnet (26) in the cross section.
  • the rotor core (21) has a shaft hole (23) at its center.
  • a drive shaft (30) for driving a load (for example, a rotary compressor of an air conditioner) is fixed to the shaft hole (23) by an interference fit (for example, shrink fitting). Therefore, the axis (O) of the rotor core (21) and the axis of the drive shaft (30) are coaxial.
  • the rotor (20) is skewed according to the axial position of the rotor (20). Therefore, a skew structure is formed in the magnet slot (24) of the rotor core (21).
  • the skew structure in the rotor core (21) is a structure in which the core member (22) is displaced in the circumferential direction according to the stacking position (axial position).
  • the rotation according to the present embodiment when the skew angle in the rotor (20) is ⁇ (mechanical angle [degree]) and the number of core members (22) to be stacked is N (N is a natural number, N ⁇ 2), the rotation according to the present embodiment.
  • the rotor is compared with the m ⁇ 1-th core member (22).
  • the main body (24c) of the magnet slot (24) is rotated by ⁇ / (N ⁇ 1) [degrees] around the axis (O) of the core (21).
  • the skew angle ( ⁇ ) of the present embodiment is determined to be a theoretical skew angle (mechanical angle [degree]) that can most reduce the cogging torque.
  • This theoretical skew angle (mechanical angle [degree]) can be expressed as 360 ° / L, where L is the least common multiple of the number of magnetic poles of the stator (the number of coil slots) and the number of magnetic poles of the rotor.
  • L is the least common multiple of the number of magnetic poles of the stator (the number of coil slots) and the number of magnetic poles of the rotor.
  • FIG. 5 is an axial cross-section of the stator (10) and the rotor (20) at the center in the axial direction of the permanent magnet (26) (hereinafter referred to as the center cross-section (F0) for convenience of explanation).
  • the center cross-section (F0) for convenience of explanation.
  • the shape of the cross section perpendicular to the axis (O) in the permanent magnet (26) (hereinafter simply referred to as the axial cross section) is a rectangular main body perpendicular to the radius of the rotor core (21).
  • each magnetic pole that is, the permanent magnet (26)
  • the permanent magnet (26) is skewed according to the axial position of the rotor (20) in order to reduce so-called cogging torque. And in this embodiment, it has the characteristics in the shape of the 1st and 2nd edge part (26a, 26b) of a permanent magnet (26).
  • the permanent magnet (26) of the present embodiment is rotated with the circumferential center (Mc) of the central cross section (F0) of the permanent magnet (26) being on the magnetic pole center line of a predetermined tooth (13).
  • the thicknesses of the portions that are both ends in the circumferential direction of the magnetic pole that is, the thickness of the first end (26a) and the second end (26b)
  • the portion far from the magnetic pole center (Pc) is thickened.
  • the magnetic pole center (Pc) of the electromagnet formed on each tooth (13) is on the center line (L) of the tooth (13).
  • the circumferential center (Mc) of the permanent magnet (26) is on the magnetic pole center line of the opposing teeth (13), that is, on the center line (L).
  • the circumferential center (Mc) of the permanent magnet (26) is on the magnetic pole center line of the teeth (13) facing each other. It will be referred to as “a state where the permanent magnet (26) is directly facing the teeth (13)” or simply “a facing state”.
  • the rotor core (21) has a region (named outer peripheral block (21a)) that can be a magnetic path on the outer peripheral side of the permanent magnet (26).
  • the central cross section (F0) of the outer peripheral block (21a) is viewed in the directly-facing state, it is symmetric with the center line (L) as the axis of symmetry (see FIG. 5).
  • the magnetic path from the tooth (13) to the first end (26a) and the magnetic path from the tooth (13) to the second end (26b) have the same magnetic resistance. That is, in the face-to-face state, in the central cross section (F0), the magnitude of the reverse magnetic field acting on the first end (26a) side is the same as the magnitude of the reverse magnetic field acting on the second end (26b) side. It is.
  • the thickness of the first and second ends (26a, 26b) are defined as the “thickness” of the first end (26a) and the second end (26b), In the central section (F0), the thickness of the first end (26a) of the permanent magnet (26) and the thickness of the second end (26b) may be the same.
  • the specific thickness of the first and second end portions (26a, 26b) in the central cross section (F0) is determined so as not to be demagnetized by a reverse magnetic field assumed in the central cross section (F0). In the present embodiment, the thickness of the first and second end portions (26a, 26b) is T0.
  • FIG. 6 shows one end face (referred to as the first end face (F1)) of the rotor (20) in the facing state.
  • the main body (26c) of the permanent magnet (26) On the first end face (F1), the main body (26c) of the permanent magnet (26) is in a position rotated to the left relative to the main body (26c) in the central cross section (F0). This is because the skew structure is adopted for the rotor (20).
  • the first end face (F1) when the outer peripheral block (21a) is divided into two parts with the center line (L) as a boundary in the facing state, the first end face (F1) side The part is larger.
  • the magnetic path from the teeth (13) to the first end (26a) is more magnetic than the magnetic path from the teeth (13) to the second end (26b). Resistance becomes smaller. That is, in the directly facing state, a larger reverse magnetic field acts on the first end (26a) side than on the second end (26b) on the first end face (F1). More specifically, in the first end face (F1), the reverse magnetic field acting on the first end (26a) is larger than the reverse magnetic field in the central cross section (F0).
  • the thickness of the permanent magnet (26) is set so that the thickness of the portion to which a larger reverse magnetic field acts becomes thicker than other portions.
  • the first end portion (26a) farther from the center line (L). Is formed thicker than the thickness (Tb) of the other second end (26b).
  • the thickness (Ta) of the first end portion (26a) is determined so as not to be demagnetized by a reverse magnetic field assumed in the directly facing state.
  • Ta Ta1> T0. This is because the reverse magnetic field acting on the first end (26a) is larger than the reverse magnetic field in the central section (F0).
  • the thickness (Tb) of the second end portion (26b) is also determined so as not to be demagnetized by a reverse magnetic field assumed in the directly-facing state.
  • the magnitude of the reverse magnetic field acting on the second end (26b) side is smaller than the reverse magnetic field acting on the first end (26a) side.
  • (Tb) may be smaller than the thickness (Ta) of the first end (26a).
  • FIG. 7 shows the other end face (referred to as the second end face (F2)) of the rotor (20) in the facing state.
  • the main body (26c) of the permanent magnet (26) is in a state of being opposed to the main body (26c) in the central cross section (F0) (see FIG. 5), as shown in FIG. In the position rotated to the right. This is because the skew structure is adopted for the rotor (20).
  • the outer peripheral block (21a) is divided into two parts with the center line (L) as a boundary in the facing state, the part on the second end part (26b) side Is bigger.
  • the magnetic path from the teeth (13) to the second end (26b) is the magnetic path from the teeth (13) to the first end (26a).
  • the magnetic resistance becomes smaller than that. That is, in the directly facing state, a large reverse magnetic field acts on the second end surface (F2) on the second end portion (26b) side. More specifically, in the second end face (F2), the reverse magnetic field acting on the second end (26b) is larger than the reverse magnetic field in the central section (F0).
  • the thickness of the permanent magnet (26) is also set so that the thickness of the portion where the larger reverse magnetic field acts on the second end surface (F2) is thicker than the other portions. Specifically, when the thicknesses (Ta, Tb) of the first and second end portions (26a, 26b) are compared on the second end surface (F2), the second end portion (the far end from the center line (L)) ( The thickness (Tb) of 26b) is formed thicker than the thickness (Ta) of the other first end portion (26a). That is, the magnitude relationship between the thicknesses of the first end (26a) and the second end (26b) at the second end face (F2) is opposite to the magnitude relation at the first end face (F1).
  • the thickness (Tb) of the second end portion (26b) is determined so as not to be demagnetized by a reverse magnetic field assumed in the directly facing state.
  • Tb Tb2
  • Tb2> T0 T0. This is because the reverse magnetic field acting on the second end (26b) is larger than the reverse magnetic field in the central section (F0).
  • the thickness (Ta) of the first end part (26a) is also determined so as not to be demagnetized by the reverse magnetic field assumed in the positional relationship shown in FIG.
  • the magnitude of the reverse magnetic field acting on the first end part (26a) side is smaller than the reverse magnetic field acting on the second end part (26b) side, so the first end part (26a ) May be smaller than the thickness (Tb) of the second end portion (26b).
  • FIG. 8 is a perspective view of the permanent magnet (26).
  • the permanent magnet (26) has a thickness (Ta) of the first end (26a) from Ta1 from the first end face (F1) to the central cross section (F0). It is configured to decrease linearly until T0.
  • the outer peripheral block (21a) is divided into two parts with the center line (L) as a boundary, the first end (26a) extends from the first end face (F1) to the central cross section (F0). This is because the side portion becomes gradually smaller.
  • the main body (26c) of the permanent magnet (26) has a constant thickness from the first end face (F1) to the second end face (F2).
  • the thickness of the main body (26c) is T0.
  • the magnitude of the reverse magnetic field acting on the permanent magnet (26) is permanent. Focusing on the fact that it differs depending on the part of the magnet (26), the thickness of the permanent magnet (26) is set so that the part where the larger reverse magnetic field acts is thicker than the other part. Thereby, compared with the case where the thickness of the whole permanent magnet is simply increased, less magnet material is required. Therefore, in this embodiment, in the rotating electrical machine (1) including the rotor (20) having the permanent magnet (26), it is possible to take measures against demagnetization while suppressing an increase in cost.
  • FIG. 9 is a perspective view of a permanent magnet (26) according to a modification of the first embodiment.
  • this modification in a predetermined axial range centered on the central cross section (F0) (hereinafter, this range in the permanent magnet (26) is referred to as a central block (26d)), the first and second end portions ( The thickness of 26a, 26b) has not changed.
  • the central block (26d) is viewed from the axial direction, it is line symmetric with respect to the center line (L).
  • the first end portion (26a) and the second end portion (26b) have the same thickness, and the thicknesses are determined so as not to be demagnetized by a reverse magnetic field assumed in the central block (26d). It has been.
  • the thickness of the first and second end portions (26a, 26b) is T0.
  • the permanent magnet (26) has the first end (26a) as in the first embodiment. Thickness (Ta) decreases linearly from Ta1 to T0. Also in this modification, when the outer peripheral block (21a) is divided into two parts with the center line (L) as a boundary, the first end (from the first end face (F1) to the central block (26d) ( This is because the portion on the 26a) side is gradually reduced. In the upper region of the permanent magnet (26), the thickness (Tb) of the second end (26b) does not change in the range from the first end face (F1) to the central block (26d).
  • the range of the permanent magnet (26) from the second end face (F2) to the central block (26d) is the second end (26b) as in the first embodiment.
  • Thickness (Tb) decreases linearly from Tb2 to T0. This is because when the outer peripheral block (21a) is divided into two parts with the center line (L) as a boundary, the second end (26b) extends from the second end face (F2) to the central block (26d). This is because the side portion becomes gradually smaller.
  • the thickness (Ta) of the first end portion (26a) does not change in the range from the second end surface (F2) to the central block (26d).
  • the thickness of the part where the larger reverse magnetic field acts in the permanent magnet (26) is set to be thicker than other parts. Therefore, also in this modification, it is possible to obtain the same effect as in the first embodiment.
  • the portion corresponding to the central block (26d) in the rotor core (21) can be configured using the core member (22) having the same shape. . That is, in this modification, the types of core members (22) that form the rotor core (21) can be reduced, and manufacturing becomes easier.
  • FIG. 10 is a plan view of the rotor (20) of the electric motor (1) according to the second embodiment when viewed from the axial direction.
  • the rotor (20) includes four permanent magnets (26) formed of bonded magnets. That is, the rotor (20) includes four magnetic poles.
  • the shape of the cross section perpendicular to the axis of the permanent magnet (26) constituting each magnetic pole is a circular arc shape having a convex inner peripheral side.
  • each magnetic pole that is, the permanent magnet (26)
  • the first end face (F1) is in a position where the permanent magnet (26) is rotated to the left with respect to the central section (F0).
  • the rotor core (21) has an outer peripheral block (21a) that can be a magnetic path on the outer peripheral side of the permanent magnet (26).
  • the central cross section (F0) of the outer peripheral block (21a) is viewed in the directly-facing state, it is symmetric with the center line (L) as the axis of symmetry. Therefore, in the face-to-face state, the magnitude of the reverse magnetic field acting on the circumferential end portions (referred to as the first end portion (26a) and the second end portion (26b), respectively) of the permanent magnet (26) in the central section (F0) The same is true.
  • the thickness of the first and second end portions (26a, 26b) is T0.
  • the outer peripheral block (21a) in the directly-facing state, is divided into two parts by dividing the outer peripheral block (21a) into two parts with the center line (L) as a boundary.
  • the part on the end (26a) side is larger. Therefore, in the first end face (F1), the magnetic path from the teeth (13) to the first end (26a) is more magnetic than the magnetic path from the teeth (13) to the second end (26b). Resistance becomes smaller. That is, a large reverse magnetic field acts on the first end (26a) side in the directly facing state. More specifically, in the first end face (F1), the reverse magnetic field acting on the first end (26a) is larger than the reverse magnetic field in the central cross section (F0).
  • the thickness of the permanent magnet (26) is set so that the portion of the permanent magnet (26) where the larger reverse magnetic field acts is thicker than other portions.
  • the thicknesses (Ta, Tb) of the first and second end portions (26a, 26b) are compared on the first end surface (F1), the first end portion (26a) farther from the center line (L).
  • the thickness (Ta) is thicker than the thickness (Tb) of the second end (26b) (see FIG. 10).
  • the thickness (Ta) of the first end portion (26a) is determined so as not to be demagnetized by a reverse magnetic field assumed in the directly facing state.
  • Ta Ta1> T0.
  • the permanent magnet (26) is configured such that the thickness gradually decreases from the first end (26a) toward the magnetic pole center.
  • the thickness of the permanent magnet (26) at the magnetic pole center (Pc) is T0.
  • the thickness (Tb) of the second end portion (26b) is also determined so as not to be demagnetized by a reverse magnetic field assumed in the directly-facing state.
  • the magnitude of the reverse magnetic field acting on the second end (26b) side is smaller than the reverse magnetic field acting on the first end (26a) side.
  • (Tb) may be smaller than the thickness (Ta) of the first end (26a).
  • the outer peripheral block (21a) is larger on the second end (26b) side when the outer peripheral block (21a) is divided into two parts with the center line (L) as a boundary.
  • the magnetic path from the teeth (13) to the second end (26b) is the magnetic path from the teeth (13) to the first end (26a).
  • the magnetic resistance becomes smaller than that. That is, a large reverse magnetic field acts on the second end (26b) side in the directly facing state. More specifically, the reverse magnetic field acting on the second end portion (26b) is larger than the reverse magnetic field in the central section (F0).
  • the thickness of the permanent magnet (26) is also set so that the thickness of the portion where the larger reverse magnetic field acts on the second end surface (F2) is thicker than the other portions. Specifically, when the thicknesses (Ta, Tb) of the first and second end portions (26a, 26b) are compared on the second end surface (F2), the second end portion (the far end from the center line (L)) ( The thickness (Tb) of 26b) is formed thicker than the thickness (Ta) of the other first end portion (26a). That is, the magnitude relationship between the thicknesses of the first end (26a) and the second end (26b) at the second end face (F2) is opposite to the magnitude relation at the first end face (F1).
  • demagnetization of the 2nd end part (26b) in a 2nd end surface (F2) is suppressed by defining the thickness of the 1st and 2nd end parts (26a, 26b) in a 2nd end surface (F2). Is done.
  • the thickness (Ta) of the first end part (26a) is also determined so as not to be demagnetized by a reverse magnetic field assumed in the directly-facing state.
  • the magnitude of the reverse magnetic field acting on the first end part (26a) side is smaller than the reverse magnetic field acting on the second end part (26b) side, so the first end part (26a ) May be smaller than the thickness (Tb) of the second end portion (26b).
  • the permanent magnet (26) has a thickness (Ta) of the first end (26a) from Ta1 to T0 from the first end face (F1) to the central cross section (F0). Until it is configured to decrease linearly.
  • the outer peripheral block (21a) is divided into two parts with the center line (L) as a boundary, the first end (26a) extends from the first end face (F1) to the central cross section (F0). This is because the side portion becomes gradually smaller.
  • the thickness (Tb) of the second end portion (26b) is linearly decreased from Tb2 to T0 from the second end face (F2) to the central cross section (F0). ing. If the outer peripheral block (21a) is divided into two parts with the center line (L) as a boundary, the second end part (26b) extends from the second end face (F2) to the central cross section (F0). This is because the side portion becomes gradually smaller.
  • FIG. 11 is a plan view of the rotor (20) of the electric motor (1) according to the modification of the second embodiment when viewed from the axial direction.
  • FIG. 11 illustrates one end face (first end face (F1)) in a directly-facing state.
  • each magnetic pole is formed by a plurality of divided permanent magnets (26).
  • this electric motor (1) is provided with a reinforcing bridge (21b) at each magnetic pole in the electric motor (1) of the second embodiment.
  • the bridge (21b) connects a portion of the rotor core (21) on the inner peripheral side with respect to the permanent magnet (26) and the outer peripheral block (21a).
  • each magnetic pole is formed by using two permanent magnets (26) having an arcuate cross section with a convex inner peripheral side. These permanent magnets (26) are skewed as in the second embodiment.
  • the permanent magnet (26) is a so-called bonded magnet.
  • the thicknesses of the end portions in the circumferential direction of the magnetic poles on the axial end surface of the rotor (20) are compared. The distance from the magnetic pole center (Pc) is thicker.
  • the thickness (Ta) of the outermost peripheral end of the permanent magnet (26) located on the left side is the other in each magnetic pole. It is formed thicker than the thickness (Tb) of the outermost peripheral end of the permanent magnet (26).
  • the circumferential shift angle between the core members (22) need not be equal.
  • the position in the circumferential direction may be shifted by using a predetermined number as one unit.
  • X core members (22) stacked so that the circumferential positions of the magnet slots have the same phase are grouped into one group, and the circumferential direction of the group unit (X units) A plurality of groups are stacked while shifting the phase.
  • each permanent magnet (26) is thicker at the farthest position from the magnetic pole center (Pc) when the thicknesses of the portions at both ends in the circumferential direction of the magnetic pole are compared in each step.
  • the permanent magnet (26) is thicker at each step from the axial end surface of the rotor (20) toward the axial center of the portion of the magnetic poles at both ends in the circumferential direction. Is configured to be thin. That is, in this configuration, the thickness of the end portions (26a, 26b) of the permanent magnet (26) changes stepwise in each magnetic pole. With this configuration, it is possible to take measures against demagnetization while suppressing an increase in cost as in the first embodiment.
  • a so-called sintered magnet can be easily employed as the permanent magnet (26) of the rotor (20).
  • a step skew structure may be realized using a bonded magnet.
  • step skew the types of core members (22) that form the rotor core (21) can be reduced, and manufacturing becomes easier.
  • each embodiment the structure of the rotor (20) described in each embodiment and each modification can be applied to the rotor of the generator in addition to the rotor of the electric motor.
  • the present invention is useful as a rotating electric machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un rotor (20) pourvu d'une pluralité d'aimants permanents (26) auxquels une inclinaison est appliquée en fonction de la position du rotor (20) dans la direction de l'arbre. Chacun des aimants permanents (26) est formé de sorte que, lorsque le centre de direction circonférentielle d'une section transversale orthogonale à l'arbre au centre des aimants permanents (26) dans la direction de l'arbre se trouve sur la ligne centrale de pôle magnétique d'une dent prédéterminée (13) et que des parties formant les deux extrémités d'un pôle magnétique dans la direction circonférentielle sont comparées en épaisseur l'une par rapport à l'autre dans une surface d'extrémité du rotor (20) dans la direction de l'arbre, la partie plus éloignée de la ligne centrale de pôle magnétique est plus épaisse.
PCT/JP2018/021871 2017-06-13 2018-06-07 Machine électrique rotative Ceased WO2018230436A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-115627 2017-06-13
JP2017115627A JP2019004552A (ja) 2017-06-13 2017-06-13 回転電気機械

Publications (1)

Publication Number Publication Date
WO2018230436A1 true WO2018230436A1 (fr) 2018-12-20

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WO (1) WO2018230436A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006180677A (ja) * 2004-12-24 2006-07-06 Hitachi Metals Ltd 鉄心一体型スキュー磁石回転子およびその製造方法
JP2008245488A (ja) * 2007-03-29 2008-10-09 Tdk Corp リング状磁石及びその製造方法、並びにモータ
WO2014115435A1 (fr) * 2013-01-28 2014-07-31 三菱電機株式会社 Mécanisme électrique rotatif de type à aimant permanent

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006086319A (ja) * 2004-09-16 2006-03-30 Mitsubishi Electric Corp リング型焼結磁石

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006180677A (ja) * 2004-12-24 2006-07-06 Hitachi Metals Ltd 鉄心一体型スキュー磁石回転子およびその製造方法
JP2008245488A (ja) * 2007-03-29 2008-10-09 Tdk Corp リング状磁石及びその製造方法、並びにモータ
WO2014115435A1 (fr) * 2013-01-28 2014-07-31 三菱電機株式会社 Mécanisme électrique rotatif de type à aimant permanent

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