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Rotor for rotating electrical machine

A technology for rotating electrical machines and rotors, which is applied in the design field of rotor laminations and can solve problems such as unacceptable safety design.

Inactive Publication Date: 2011-11-23
NIDEC SR DRIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

exist Figure 4 , the value of the stress contour in the pole body is the same as image 3 same as in , but at 10,000rev / min, the stress at the root of the pole is now above 300MPa, which is unacceptable for a safe design

Method used

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  • Rotor for rotating electrical machine
  • Rotor for rotating electrical machine
  • Rotor for rotating electrical machine

Examples

Experimental program
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Effect test

Embodiment Construction

[0050] Figure 5 A portion of a rotor lamination according to an embodiment is shown. The major dimensions of the laminations are image 3 Those dimensions of the laminations are the same, where the pole width is 28.6mm. A circular hole 50 has been introduced into the rotor pole 52 . The center 53 of the hole is placed on the centerline 54 of the pole, and in this example the hole has a diameter of 16 mm. Other sized circles or other geometric shapes can be used to form the holes, as discussed below.

[0051] Although it might be expected that reducing the cross-section of the material near the root of the pole would have the effect of increasing the stress in the laminations for a given operating condition, however Figure 5 The stress contours in , show that this is not the case. Analysis of the stress values ​​showed that the peak stress was actually reduced by about 17%. This is counter-intuitive, but is thought to result from a reduction in pole stiffness which in t...

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PUM

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Abstract

A rotating electrical machine has a rotor composed of laminations having salient poles. The poles have one or more holes which are positioned so as to reduce the peak stress experienced by the lamination when the rotor is rotating. The holes are chosen according to a disclosed design procedure which gives a reduction in peak stress for a given limit on the output of the machine.

Description

technical field [0001] The present invention generally relates to the design of rotor laminations for electric machines. The invention is particularly advantageous for laminations having a relatively small number of salient poles, such as those commonly used in reluctance machines and some permanent magnet machines. Background technique [0002] Electric motors are usually constructed from laminations of electrical steel sheets, forming a structure to carry the magnetic flux on which the motor relies for its operation. The structure is laminated to reduce the effect of eddy currents flowing in the steel due to the time rate of change of the magnetic flux. Typically only motors with constant flux have a non-laminated construction. For example, the field structure of dc motors can be non-laminated (ie, made of a single piece of metal), and even in these machines, laminated structures are often employed to reduce transient response when the motor is subjected to new operating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/24H02K15/02
CPCH02K1/246H02K1/22H02K15/02H02K19/10H02K1/24
Inventor 菲利普.G.迪金森保罗.A.塞克斯诺曼.N.富尔顿希拉克.R.杜莱拉杰
Owner NIDEC SR DRIVES