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Rotor

A rotor and rotor core technology, applied in the field of embedded magnet synchronous motors, can solve the problems of motor torque density reduction and achieve the effect of preventing torque density reduction

Active Publication Date: 2015-06-10
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a problem that the torque density of the motor decreases with respect to the rotor core using magnets of the same length as the depth of the magnet insertion hole.

Method used

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Experimental program
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Effect test

no. 1 approach ）

[0038] figure 1 It is an explanatory diagram of the rotor 1 according to the first embodiment of the present invention. figure 1 (A) shows a cross-sectional view of a plane perpendicular to the axial direction of the rotor 1. figure 1 (B) means figure 1 (A) A-A section view.

[0039] The rotor 1 is configured by inserting permanent magnets 20 into magnet holes 30 formed in the rotor core 10.

[0040] The rotor core 10 is constituted by laminating flat plates 11 made of electromagnetic steel sheets in the axial direction (rotation axis direction of the rotor 1 ). Such as figure 1 As shown in (a), the plate 11 is respectively provided with a shaft hole 12 through which the shaft penetrates at the center portion, and the end surface of the rotor core 10 is opened at equal intervals in the circumferential direction around the shaft hole 12 and extends along The magnet hole 30 penetrates in the axial direction.

[0041] In the rotor core 10, a permanent magnet 20 is inserted into each ma...

no. 2 approach ）

[0073] Next, a second embodiment of the present invention will be described.

[0074] Figure 7 and Figure 8 It is an explanatory diagram of the rotor core 10 of the second embodiment of the present invention.

[0075] In the first embodiment described above, the front and back surfaces of the plates 11 of the same shape are laminated in reverse to form different eccentric blocks 10a and 10b. In contrast, in the second embodiment, the connecting block 15 is arranged between the different eccentric blocks 10a and 10b. In addition, the same reference numerals are given to the same configuration as the first embodiment, and the description thereof is omitted.

[0076] Figure 7 (A) is an explanatory drawing of the main part of the plate 11a which comprises the eccentric block 10a. Figure 7 (B) is an explanatory diagram of the main part of the plate 11b constituting the connection block 15. Figure 7 (C) is an explanatory drawing of the main part of the plate 11a which comprises the e...

no. 3 approach ）

[0085] Next, a third embodiment of the present invention will be described.

[0086] Picture 9 It is an explanatory diagram of the rotor core 10 of the third embodiment of the present invention.

[0087] Picture 9 (A) is a perspective view of the permanent magnet 21 of the third embodiment. Picture 9 (B) Represents the rotor core 10 figure 1 (A) A-A section view. In addition, the same reference numerals are given to the same configurations as those of the first embodiment, and the description thereof is omitted.

[0088] In the third embodiment, by carefully designing the shape of the permanent magnet 21, the gap 31 is communicated between the different eccentric blocks 10a and 10b.

[0089] Specifically, such as Picture 9 As shown in (a), a notch 25 is formed in a portion orthogonal to the surface 22 on one end side in the circumferential direction on a surface horizontal to the axial direction of the permanent magnet 21 and a surface 23 on one end side perpendicular to the a...

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Abstract

The present invention provides a rotor in which the volume of permanent magnet is not reduced. A rotor core (10) is composed of a first stacked block (10a) and a second stacked block (10b) which are fixed through movement along a rotation direction. Each magnet hole (30) is provided with a first clearance part (31a) and a second clearance part (31b) without permanent magnet at one end and the other end in the rotation direction. At the part where the first stacked block is jointed with the second stacked block, the area of at least one in the first clearance part and the second clearance part is enlarged according to a mode that the first clearance parts are intercommunicated as well as the second clearance parts.

Description

Technical field [0001] The present invention relates to an embedded magnet type synchronous motor. Background technique [0002] In an embedded magnet type synchronous motor (so-called IPM motor) constructed by embedding permanent magnets in the iron core (rotor iron core) of the rotor, the rotor has the following structure. [0003] The rotor is composed of a rotor core made by laminating electromagnetic steel sheets provided with a plurality of magnet holes and permanent magnets inserted into the magnet holes. At the circumferential end of the magnet hole, a gap (flux barrer) extending in the direction of the rotation axis of the rotor core is provided in order to prevent short-circuit of the magnetic flux of the magnet. In addition, to fix the magnet in the magnet hole, the void is filled with filler such as resin or adhesive. [0004] Among such rotor cores, there is known a rotor structure in which the rotor core is divided into a plurality of blocks in the stacking direction,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27H02K1/28
Inventor 池见健木村真秀
Owner NISSAN MOTOR CO LTD
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