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Bow magnet pieces, permanent magnet pieces, permanent magnet assemblies, permanent magnet application devices, and electric motors

A technology of permanent magnets and magnet sheets, applied in the field of electric motors, can solve problems such as uneven magnetic flux, deterioration of interface parts, and difficulty in ensuring mechanical strength, so as to improve productivity, reduce cogging torque or torque ripple, and improve economic efficiency. sexual effect

Active Publication Date: 2019-03-05
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the case of an assembled magnet in which a plurality of permanent magnet pieces are bonded and integrated with an adhesive, after magnetization, a repulsive force is generated between the adjacent permanent magnet pieces, and even if various efforts are made, the mechanical strength will be affected. is also disadvantageous
In particular, there is a problem that it is difficult to use in the expected severe use environment, or difficult to use in places with strict strength conditions.
[0013] In addition, in the method disclosed in Patent Document 3, repulsive force is also generated between the permanent magnet pieces during bonding, and the stress state inside the adhesive cannot be said to be good, making it difficult to ensure mechanical strength.
[0014] Furthermore, in any of the cases of Patent Documents 2 to 4, there is a problem that the uniformity of the magnetic field of the assembled magnet deteriorates at the interface portion between the adjacent permanent magnet pieces and the magnetic flux becomes uneven.

Method used

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  • Bow magnet pieces, permanent magnet pieces, permanent magnet assemblies, permanent magnet application devices, and electric motors
  • Bow magnet pieces, permanent magnet pieces, permanent magnet assemblies, permanent magnet application devices, and electric motors
  • Bow magnet pieces, permanent magnet pieces, permanent magnet assemblies, permanent magnet application devices, and electric motors

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0120] Figure 1A It is a perspective view schematically showing the structure of a preferable embodiment of the bow magnet piece of this invention. The bow-shaped magnet piece 1 has an outer peripheral surface 2 curved in the circumferential direction W with respect to an axis O of a rotating shaft of a motor (not shown), and an inner peripheral surface 3 that is opposite to the outer peripheral surface 2 and has the same axis O and is curved. , as a whole becomes an arcuate shape.

[0121] The arcuate magnet piece 1 has an upper end surface 4 and a lower end surface 5 that are perpendicular to the axis O, and these end surfaces 4 and 5 are substantially perpendicular to the outer peripheral surface 2 and the inner peripheral surface 3 . In addition, the bow-shaped magnet piece 1 has a first connection side surface 6 and a second connection side surface 7 parallel to the axis. The second connection side surface 7 is separated from the first connection side surface 6 in the c...

no. 2 Embodiment approach

[0178] Although not shown in the figure, the arched magnet piece according to the second embodiment of the present invention is formed by a generally used sintered magnet forming process and is substantially radially oriented and magnetized with anisotropy Except for the structure of the rare earth sintered magnet, it has the same structure as that of the first embodiment and can obtain the same effect. Hereinafter, only the parts different from those of the first embodiment will be described, and the description of the common parts will be omitted.

[0179] Likewise, for comparison, as in Figure 2C As shown, when the conventional bow-shaped magnet pieces 10a are arranged shifted clockwise by 0.5 degrees, the attracting torque that acts is −96.3 mNm.

[0180] Similarly, in Figure 2C The attracting torque acting when the shown bow-shaped magnet piece 10 a is arranged counterclockwise by 0.5 degrees is +96.3 mNm.

[0181] Similarly, in Figure 1C In the case of the indicat...

no. 3 Embodiment approach

[0187] Although not shown in the drawing, the arched magnet piece according to the third embodiment of the present invention magnetizes the isotropic sintered ferrite magnet formed by the generally used sintered magnet forming process substantially in the radial direction. Except for the configuration, it has the same structure as the first embodiment and can obtain the same effect. Hereinafter, only the parts that are different from the first embodiment will be described, and the description of the common parts will be omitted.

[0188] Likewise, for comparison, as in Figure 2C As shown, when the conventional bow-shaped magnet piece 10a is arranged shifted clockwise by 0.5 degrees, the attracting torque acting is −2.1 mNm.

[0189] Similarly, in Figure 2C The attracting torque acting when the shown bow-shaped magnet piece 10 a is arranged counterclockwise by 0.5 degrees is +2.1 mNm.

[0190] Similarly, in Figure 1C In the case of the indicated first specified angle θ1 ...

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Abstract

An arcuate magnet piece (1), having connecting side surfaces (6, 7) of other arcuate magnet pieces (1A) combined adjacently, a curved inner peripheral surface (3), facing the inner peripheral surface (3) and Curved peripheral surface (2). The connecting side surfaces (6, 7) have front end surfaces (6a, 7a) intersecting at a predetermined angle (θ1) or (θ2) with respect to a tangent line (T1, T2) in the bending direction of the outer peripheral surface (2). The connection side surfaces (6, 7) are magnetized so that the magnetic poles of the other arcuate magnet pieces (1A) combined with the gaps between the connection side surfaces of the other arcuate magnet pieces (1A) are arranged substantially parallel.

Description

technical field [0001] The invention relates to a bow-shaped magnet piece, a permanent magnet piece, a permanent magnet assembly, a permanent magnet application device and a motor. Background technique [0002] Conventionally, permanent magnet motors, which are easy to obtain high efficiency, have been widely used in various motors such as automobiles, OAs, and industrial machines. For this permanent magnet motor, generally, with respect to the rotor wound with coils, 2n (n is a positive integer) arcuate magnet pieces or 2n (n is a positive integer) arranged on the surface of relative rotation are incorporated. ) a ring magnet with a multi-stage structure of magnetic poles. [0003] Permanent magnet motors used in such applications are being rapidly improved in performance along with miniaturization and thinning. In response to this, improvements in miniaturization and thinning are required for magnets mounted on motors. Further improvements in magnetic properties such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27H01F7/02
CPCH02K1/2713H02K15/03H02K2213/03H01F7/021H02K1/2788G01R33/383H02K1/2706
Inventor 真保信之后藤真史
Owner TDK CORPARATION