The invention is based on a winding support for an electrical machine as generically defined by the preamble to claim 1. A winding support of this kind is embodied as a lamination packet and has a plurality of pole teeth. The pole teeth each have a pole foot, about which a winding can be disposed. The laminations are embodied with an always constant width. As a result of layering of the laminations one behind the other, the pole foot has a block about which the winding must be laid, resulting in a relatively great wire length.
The winding support of the invention for an electrical machine, having the definitive characteristics of claim 1, has the advantage that because of graduations in the tooth width, the tooth cross section is “rounded”, and thus the circumference is less. This makes the winding wire shorter, and as a result the resistance drops. This makes higher efficiency possible. Or enables the use of a thinner wire. This is advantageous particularly with single-tooth windings, in which the copper filling in the slot chamber is slight. For that purpose a winding support is contemplated which is embodied as a lamination packet and has a plurality of pole teeth, which each have a pole foot about which a winding can be disposed, and in which the pole teeth have an increasing width, beginning at the face ends of the lamination packet.
In a preferred refinement, the laminations of the lamination packet, beginning at the face ends of the lamination packet toward the middle in the region of the pole feet, have an increasing width that is at its maximum in the middle. The result is an especially favorable ratio in terms of size and circumference.
Preferably, the winding support has a portion from which the pole teeth protrude radially, and outer circumferential regions of the portion which are located between adjacent pole teeth are located essentially on a circle. As a result of this geometry, the winding support is especially well suited as an armature or stator of a permanently excited direct current motor.
In an advantageous refinement, the pole teeth have pole heads, which are wider than the pole feet, and the pole heads have a constant width over the length of the winding support. The result is improved efficiency.
Preferably, the pole teeth, at least in the region of the pole feet about which the winding can be disposed, are provided at least on the face end with insulation masks. This is a space-saving provision for insulation. If the insulation masks have a portion, contacting the face ends of the pole feet, which is adjoined by two obliquely protruding fins, which conform to the side faces of the pole feet, the result is optimal insulation.
An especially space-saving refinements is obtained if the maximum width of the pole feet is essentially equivalent to the length of the winding support.
With a winding support of this kind, especially compact armatures are obtained. An electrical machine with a winding support of this kind is also quite small and yet still has quite good performance values.
Further advantages and advantageous refinements will become apparent from the dependent claims and the description.
One exemplary embodiment is shown in the drawing and described in further detail in the ensuing description.
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The pole heads 40 are wider than the pole feet 38 but over the length of the lamination packet 18 they have a constant width. The result is a constant slot opening 46 of the slots 42, which has a favorable effect on the performance.
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Alternatively, it is also conceivable for the lamination packet 18 to be longer than the width of the pole feet 38. However, in that case the construction is not so compact.
Instead of the armature 18 shown, there may be a wound stator, such as an external rotor motor. Another possibility is an annular stator, for instance of a generator, with inward-oriented pole teeth.
Number | Date | Country | Kind |
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10 2004 018 208.6 | Apr 2004 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP05/50555 | 2/9/2005 | WO | 10/13/2006 |