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Rotor For An Electric Machine

A technology for rotors and rotating shafts, applied in the field of rotors for motors, can solve the problems of reducing dynamic performance, reducing maximum power, high current demand, etc., and achieves the effects of low cost, reducing reverse field load, and reducing armature reaction

Active Publication Date: 2016-03-16
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In electric machines, especially in permanently excited synchronous machines, armature reaction adversely affects the saturation ratio, reducing the maximum power at a given maximum voltage, resulting in high current demands and reducing the general dynamic performance

Method used

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  • Rotor For An Electric Machine
  • Rotor For An Electric Machine
  • Rotor For An Electric Machine

Examples

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Embodiment Construction

[0078] figure 1 A cross-section of a first embodiment of a rotor according to the invention is shown. The rotor is rotatable about an axis of rotation 10 and has a plurality of permanent magnets 1 for forming two pole pairs on its radially outer side. The rotor has an anisotropic magnetically soft sintered material 2 , which has a light direction 3 and a heavy direction 4 , radially inner than the permanent magnets 1 . Within the framework of the present exemplary embodiment, each magnetic pole is provided with a separate region of the anisotropically soft magnetic sintered material 2 .

[0079] as in figure 1 As seen in , the rotor has a d-axis 6 and a q-axis 8 , which are also referred to as direct axes or transverse axes, for corresponding pairs of poles. The magnetic flux present during operation of the corresponding electrical machine can be resolved along the respective d-axis or q-axis in the form of d-flux or q-flux components.

[0080] In this case, such materia...

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Abstract

A rotor for an electric machine is mounted for rotation about an axis and includes a plurality of permanent magnets placed on a radial outer surface of the rotor for forming at least one magnetic pole pair. An anisotropically-soft sintered magnetic material having an easy direction and a hard direction is located in at least one section of the rotor radially further inward than the plurality of permanent magnets.

Description

technical field [0001] The invention relates to a rotor for an electrical machine, wherein the rotor is rotatable about a rotational axis and wherein the rotor has on its radially outer surface for forming at least one pole pair, preferably two or more pole pairs multiple permanent magnets. Furthermore, the invention relates to an electric machine with a rotor of this type. Background technique [0002] Rotors of this type are used, for example, in permanently excited synchronous machines. [0003] In electrical machines, especially in permanently excited synchronous machines, armature reaction adversely affects the saturation ratio, reduces the maximum power at a given maximum voltage, leads to high current demands and reduces the general dynamic performance. This leads to an increased demand for high coercivity magnets. [0004] To date, motors have been constructed with relatively thick magnets and relatively large air gaps, keeping armature reactions small. [0005] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27
CPCH02K1/02H02K1/246H02K1/278
Inventor 拉尔夫·菲舍尔科尔宾尼安·彼得迈尔罗尔夫·福尔默
Owner SIEMENS AG