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Method of determining a magnet arrangement

A magnet and stator technology, applied in the field of determining magnet settings, can solve problems such as unsatisfactory actual performance and complex analysis, and achieve the effect of simple and fast machine performance

Inactive Publication Date: 2012-04-18
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The more variables that are varied to optimize the solution, the more complex the analysis becomes
Factors such as manufacturing tolerances (e.g. eccentricity) can cause actual performance not to meet (simulated) expectations because the geometry being modeled differs significantly from the actual manufactured machine

Method used

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  • Method of determining a magnet arrangement

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Embodiment Construction

[0030] In the drawings, like reference numerals refer to like objects throughout. Objects in the drawings are not necessarily drawn to scale.

[0031] FIG. 1 shows a very simplified cross-section through a generator 3 showing a rotor 1 and a stator 2 and a plurality of magnets M arranged on the rotor 1 . In a conventional simple arrangement, the magnets M are all equidistantly spaced from each other. The stator 2 comprises a plurality of teeth 2a defining a plurality of slots 2b for receiving stator windings (not shown). The stator 2 and thus the stator teeth 2a are usually made of steel so that during operation a magnetic force acts between the magnets M and the stator teeth 2a, called cogging torque.

[0032] figure 2 Some of the steps taken to achieve the first magnet arrangement 10 according to the invention for two performance parameters of the generator are shown. First, the magnets M (shown in part A of the figure and initially equidistant) will be divided into grou...

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Abstract

The invention describes a method of determining a magnet arrangement for the magnets of a rotor or stator of an electrical machine, which method comprises the steps of identifying a number of performance parameters of the electrical machine, which performance parameters are to be adjusted; assigning a plurality of neighbouring magnets to a magnet group, wherein a magnet group comprises a reference magnet and at least one further magnet, which further magnet is arranged relative to the reference magnet; identifying a number of distinct magnet arrangement variables for the magnet group, whereby the number of magnet arrangement variables is equal to the number of performance parameters; calculating the value of an arrangement variable according to a desired adjustment of a performance parameter; and-arranging a further magnet of the magnet group relative to the reference magnet of that magnet group according to the calculated arrangement variable. The invention also describes a method of arranging a plurality of magnets on a rotor or stator of an electrical machine. The invention also describes a wind turbine with a generator comprising a rotor, a stator and a plurality of magnets, arranged on the rotor in such a magnet arrangement.

Description

technical field [0001] The invention describes a method of determining magnet settings for magnets of an electric machine. The invention also describes a method of arranging a plurality of magnets of an electric machine. The invention also describes a wind turbine with a generator and a plurality of magnets arranged in such a magnet arrangement. Background technique [0002] For various well-known reasons, electric motors and generators do not function perfectly, and a variety of factors can compromise overall efficiency. For example, cogging torque is caused by the magnetic attraction between the magnets of the rotor and the stator slots or teeth. In a uniform arrangement where the magnets / stator slots are both equidistantly placed, the magnetic attraction between the magnets and stator slots is relatively large for a particular position of the rotor relative to the stator. Small motors and generators can usually be optimized satisfactorily. However, in large machines, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/00
CPCH02K7/1838Y02E10/725H02K2213/03H02K1/17H02K15/03H02K1/278H02K2213/12H02K29/03Y02E10/72H02K1/27
Inventor K.安德森E.格罗恩达尔K.彼得森
Owner SIEMENS AG
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