Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-04-17
1994-01-18
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310112, 310154, 310179, 310258, 318701, H02K 1742
Patent
active
052802116
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a motor and/or generator operating according to the reluctance principle and in particular, a motor and/or generator having a stator that has sector stators that are distributed over the circumference of the rotor and, are mutually magnetically separated. Each sector contains a pair of toothed sector stator elements. The pair of sector stator elements are arranged one behind the other and separated by an axial distance. Each stator sector element pair has common power windings, each ends in a radially projecting pole shank. Each pole shank can be excited in a polarity opposing the other sector stator element by an excitation winding part wrapped around it. Both pole shanks are connected radially outside by a return yoke.
A motor and/or generator operating according to the principle of the stator-excited synchronous machine of sectoral design is known from EP-B1-0,103,821.
In the configuration disclosed in that European patent document, the sector stator elements of a sector stator are mutually separated by an axial spacing chamber. The cylindrical circumferential surface of a flywheel, also used as a rotor of the motor and/or generator, especially for coupling a motor vehicle internal-combustion engine, is configured in the form of two spider wheels offset with a certain axial spacing distance.
DE-A-3,335,626 has disclosed a single-phase or multiphase a.c. machine with homopolar excitation and laminated stator cores, arranged axially one behind another. Axially magnetized magnets are inserted between the yoke arches for stray-field compensation.
SUMMARY OF THE INVENTION
The present invention increases the operating efficiency of a conventional motor and/or generator operating according to the reluctance principle, such as the type mentioned at the beginning, by preventing an undesired, large stray field. The present invention accomplishes this by arranging an axially magnetized permanent magnet arrangement comprising the yoke arches and magnet parts covering the stator teeth of a sector stator element and having a magnetization opposing the winding excitation in the sector stator elements in the axial spacing chamber between the sector stator elements of a sector stator such that its magnetic field closes, in an axial/tangential-radial fashion, the yokes of the sector stator elements, or, radially via stator teeth, the air gap and the offset rotor poles, and axially/tangentially via the rotor yoke. The magnet parts may be expediently combined to form a one-piece magnet arrangement from a sintered molded magnet.
According to a first embodiment of the present invention, the magnet arrangement consists only of a magnet part essentially covering the yoke arch of a sector stator element in each case. The design and installation of the first embodiment is particularly simple. Should this chamber be unavailable or not completely available for accommodating a magnet arrangement, according to a further embodiment of the present invention, magnet parts covering the stator teeth of a sector stator element are additionally provided. A known motor and/or generator may be greatly improved when the magnet arrangement consists of magnet parts respectively covering both the yoke arch and the stator teeth of a sector stator element. Combining the magnet parts to form a one-piece magnet arrangement from a sintered molded magnet is preferable.
In the present invention, the interaction between, on the one hand, the excitation that can be controlled by the excitation winding parts and, on the other hand, the permanent magnetization provided by the magnet arrangement permits reducing the excitation winding copper in conjunction with simple controllability of the excitation, and avoids an undesired large stray field between the end faces of the laminated cores, located axially in front of each other, of the sector stator elements.
As an example, mutually bonding the end faces of the laminated cores of the sector stator elements located in front of each other to reta
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Freise Werner
Schmidt Helmut
Weinhold Wolfgang
Winter Udo
Zaps Klaus
Siemens Aktiengesellschaft
Skudy R.
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