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Rotors for rotating electrical machines

A technology for rotating electrical machines and rotors, applied to synchronous motors with stationary armatures and rotating magnets, electric components, electrical components, etc., which can solve the problems of magnetic flux leakage of permanent magnets, output torque reduction, and reduction

Active Publication Date: 2015-08-19
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if this structure is configured, the magnetic flux of the permanent magnets will leak from the bridge, so the amount of magnetic flux that is linked from the rotor to the stator to generate torque (hereinafter referred to as "linkage flux" for convenience) will be reduced.
As a result, the output torque will decrease

Method used

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  • Rotors for rotating electrical machines
  • Rotors for rotating electrical machines
  • Rotors for rotating electrical machines

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0031] figure 1 It is a diagram showing the first embodiment of the rotor for a rotating electrical machine according to the present invention, and is a cross section perpendicular to the rotor axis, showing 1 / 4 of the entire circumference (90° in mechanical angle). Figure 2 is figure 1 A partial enlargement of the Figure 2A Indicates near the tip of the void formed on the rotor core, Figure 2B An enlarged view showing the vicinity of the base end on the rotor shaft side where the void formed in the rotor core is observed.

[0032] The rotor 1 for a rotating electrical machine has a rotor shaft 10 , a rotor core 20 , and a set 30 of permanent magnets 31 .

[0033] The rotor shaft 10 is the rotation axis of the rotor 1 .

[0034] Such as figure 1 As shown, the rotor core 20 is disposed around the rotor shaft 10 . The rotor core 20 is formed by laminating a plurality of electrical steel sheets in the rotor axial direction. In the rotor core 20 , a group of voids 21 h...

no. 2 Embodiment approach

[0055] 4 is a view showing a second embodiment of a rotor for a rotating electrical machine according to the present invention, and is a cross section perpendicular to the rotor axis, showing the vicinity of the base end of the gap formed in the rotor core on the rotor axis side. Figure 4A Indicates the case where a rectangular magnet is used, Figure 4B Indicates the case where a magnet that is not rectangular and has no mutually parallel faces is used.

[0056] And, if Figure 4B As shown, in the case of a permanent magnet that is not rectangular and has no mutually parallel surfaces, the magnet width Wm is the length of the magnetic pole surface 31 a on the outer peripheral side. In addition, the magnet thickness Tm is the length of the side surface 31 c on the d-axis (symmetry axis 7 ) side.

[0057] At this time, the larger the magnet width Wm, the larger the inter-magnet gap Gm, and the larger the magnet thickness Tm, the smaller the inter-magnet gap Gm. That is, the...

no. 3 Embodiment approach

[0064] Figure 5 It is a view showing a third embodiment of the rotor for a rotating electric machine according to the present invention, and is a cross section perpendicular to the rotor axis, showing the vicinity of the base end of the gap formed in the rotor core on the rotor axis side.

[0065] In this embodiment, the following formula (2) is satisfied when Gm is the gap between magnets, Tm is the thickness of the magnet, and Wm is the width of the magnet.

[0066] Formula 2

[0067] 0 ( Gm × Tm Wm ) ≤ 0.25 . . . ( 2 )

[0068] In addition, the inter-magnet gap Gm is the distance between the permanent magnet 31 and the d-axis (symmetry axis 7 ). That is, the inter-magnet gap Gm is the distance from the side surface 31c of the permanent magnet 31 ...

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Abstract

A rotating electric machine rotor is equipped with a rotor core and a pair of permanent magnets disposed in a V-shape that opens toward an outer periphery of the rotor core. The pair of permanent magnets is separated in an inner periphery direction of the rotor core, and the rotor core contains a gap formed by connecting between at least the separated permanent magnets.

Description

technical field [0001] The invention relates to a rotor for a rotating electrical machine. Background technique [0002] The current phase of the embedded magnet type permanent magnet motor (Interior Permanent Magnet motor (hereinafter referred to as "IPM motor" for convenience)) in which permanent magnets are embedded in the rotor core is determined by two axes: d-axis current and q-axis current. control. As a result, the magnetic field from the permanent magnet is weakened, the reluctance torque is effectively utilized, and high output operation can be realized over a wide range. [0003] In addition, in particular, an IPM motor in which the magnets are arranged in a V shape can effectively utilize both the torque from the permanent magnets (magnet torque) and the reluctance torque. As a result, the output can be further improved. [0004] When a d-axis current is applied to apply a reverse magnetic field to the permanent magnet, the magnetic field from the permanent ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27H02K1/22H02K21/14
CPCH02K1/2766H02K1/2706
Inventor 仲田彻
Owner NISSAN MOTOR CO LTD