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Rotor of a rotating electrical machine

A technology for rotating electrical machines and rotors, which is applied in the field of claw pole rotors, which can solve the problems of rotor electromotive force reduction and output reduction, and achieve the effects of ensuring cooling, reducing the amount of conductor wires, and reducing the average outer diameter

Inactive Publication Date: 2020-10-09
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increase of the resistance value of the excitation coil, the electromotive force of the rotor decreases and the output decreases

Method used

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  • Rotor of a rotating electrical machine
  • Rotor of a rotating electrical machine
  • Rotor of a rotating electrical machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] figure 1 is a sectional view showing the rotor of the rotating electrical machine according to Embodiment 1 of the present invention, figure 2 It is a sectional view showing a main part of the rotor of the rotating electrical machine according to Embodiment 1 of the present invention. In addition, in figure 2 , the dotted line A is the outer diameter of the root positions of the first claw-shaped magnetic pole portion and the second claw-shaped magnetic pole portion.

[0024] exist figure 1 and figure 2 Among them, the rotor 1 includes: a rotating shaft 2; a claw pole core 3 fixedly connected to the rotating shaft 2; an exciting coil 12; and centrifugal fans 14, 15 as cooling fans.

[0025] The claw pole core 3 is divided into a first pole core 4 and a second pole core 8 . The first pole core 4 includes: a first cylindrical portion 5; a thick-walled ring-shaped first yoke portion 6, which is integrally formed at one axial end portion of the first cylindrical por...

Embodiment approach 2

[0042] image 3 It is a cross-sectional view showing a main part of the rotor of the rotating electrical machine according to Embodiment 2 of the present invention.

[0043] exist image 3 Among them, the exciting coil 12A is formed in a mountain shape in which two peaks are connected side by side in the axial direction, and the central part in the axial direction is a valley. In addition, the outer diameters at both ends in the axial direction are equal to the outer diameter A at the root positions of the first claw-shaped magnetic pole portion 7 and the second claw-shaped magnetic pole portion 11 . The outer diameter of the bottom portion of the valley is smaller than the outer diameter A at the base of the first claw-shaped magnetic pole portion 7 and the second claw-shaped magnetic pole portion 11 . The outer diameters of the tops of the two peaks are larger than the outer diameters A at the root positions of the first claw-shaped magnetic pole portion 7 and the second c...

Embodiment approach 3

[0048] Figure 4 It is a cross-sectional view showing a main part of a rotor of a rotating electric machine according to Embodiment 3 of the present invention.

[0049] exist Figure 4 Among them, the exciting coil 12B is formed in a mountain shape in which three peaks are connected side by side in the axial direction, and the peaks are at both ends in the axial direction and at the center. In addition, the outer diameters at both ends in the axial direction are equal to the outer diameter A at the root positions of the first claw-shaped magnetic pole portion 7 and the second claw-shaped magnetic pole portion 11 . The outer diameters of the bottoms of the two valleys are smaller than the outer diameters A at the root positions of the first claw-shaped magnetic pole portion 7 and the second claw-shaped magnetic pole portion 11 . The outer diameters of the tops of the three peaks are larger than the outer diameters A at the root positions of the first claw-shaped magnetic pole...

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Abstract

The present invention provides a rotor for a rotating electrical machine capable of reducing the cost by suppressing an increase in the amount of conductor wires while ensuring cooling performance, and suppressing an increase in centrifugal force acting on an exciting coil. The rotor of this rotating electrical machine includes: a claw-pole type iron core having a cylindrical portion, a pair of yoke portions, and a plurality of claw-shaped magnetic pole portions, wherein the pair of yoke portions are arranged on the shaft of the cylindrical portion. A plurality of the claw-shaped magnetic pole portions extend alternately in the axial direction from each of the pair of yoke portions; a bobbin mounted on the outer periphery of the cylindrical portion; an exciting coil , which is wound on the bobbin in overlapping layers, and is in contact with the root side of the inner peripheral surface of the claw-shaped magnetic pole portion; and a cooling fan, which supplies air to the outer peripheral surface of the exciting coil, so that The field coil is formed in a mountain shape in which two or more peaks are connected side by side in the axial direction, and the top of each of the peaks is positioned radially outward from the root of the claw-shaped magnetic pole portion.

Description

technical field [0001] The present invention relates to a claw pole rotor applied to, for example, a rotating electrical machine such as an alternator or a motor mounted on a vehicle. Background technique [0002] In such automotive alternators, the demand for higher output has increased in recent years, and the demand for noise reduction has become stricter due to end users' pursuit of high quality. [0003] Also, when current flows through the exciting coil, the temperature of the exciting coil rises due to Joule heat, increasing the resistance value. As the resistance value of the exciting coil increases, the electromotive force of the rotor decreases and the output decreases. [0004] In view of the above situation, the outermost diameter of the exciting coil is made larger than the outer diameter of the root of the claw-shaped magnetic pole portion, the surface area of ​​the exciting coil is increased, and the exciting coil is actively cooled by the cooling fan, thereb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/24
CPCH02K1/24H02K1/243H02K3/24H02K3/325H02K9/06H02K2203/12H02K21/044
Inventor 长谷川和哉
Owner MITSUBISHI ELECTRIC CORP