DE102008032214B4 - Reluctance motor - Google Patents

Abstract

Reluctance motor, characterized in that the rotor comprises cut-out areas regularly arranged in the circumferential direction, in particular with pole areas being arranged in the circumferential direction between the cut-out areas, and that the stator winding is designed with individual tooth winding, the cut-out areas each being formed from a group of individual cut-outs, the rotor is designed as a laminated core, the recesses being punched out of the sheet metal parts, in particular the sheet metal parts being provided stacked axially one behind the other, with all recesses being interrupted, in particular in the area of the plane of symmetry of the recess or the associated group.

Description

The invention relates to a reluctance motor.

Reluctance motors usually have a rotor which comprises radially protruding pole areas.

From the DE 199 33 009 A1 A reluctance motor is known as the closest prior art.

From the DE 697 24 883 T2 a reluctance motor with magnetic poles is known which consist of laminated cores arranged in the circumferential direction.

From the DE 101 43 253 A1 a method of manufacturing a rotor for a reluctance motor and a rotor manufactured thereby are known.

From the US 2003 0090167 A1 a rotary electric machine for an electric vehicle is known.

From the GB 1 114 562 A a rotor for a dynamo-electric machine is known.

From the DE 27 44 160 A1 an AC synchronized reluctance motor is known.

The invention is based on the object of developing a reluctance motor in such a way that production becomes simple and inexpensive.

According to the invention, the object is achieved with the features specified in claim 1.

Important features of the invention in the reluctance motor are that the rotor comprises cutout areas regularly arranged in the circumferential direction, in particular with pole areas being arranged in the circumferential direction between the cutout areas,
and that the stator winding has a single tooth winding.

The advantage here is that the motor is easy to manufacture. In particular, the individual tooth winding is easy to implement. But the recess areas can also be produced, for example, by punching out. The regularity also contributes to the simple production.

In an advantageous embodiment, a magnetic transverse direction is defined by means of the cutout areas, in particular when the cutout areas are designed symmetrically by their respective plane of symmetry. The advantage here is that the longitudinal direction lies between the recess areas and the transverse direction does not have 90 ° but lies in the direction in which essentially the greatest amount of recessed material is provided, in particular in the plane of symmetry.

In an advantageous embodiment, the cutout areas are each formed from a group of individual cutouts. The advantage here is that production can be carried out in a simple manner. In addition, the mechanical stability of the rotor is better than when large continuous areas are cut out.

In an advantageous embodiment, the stator comprises a laminated core which has individual teeth which are directed radially towards the rotor in the circumferential direction and onto which a winding is provided in each case. The advantage here is that the winding can be produced in a particularly simple and inexpensive manner.

In an advantageous embodiment, the rotor is designed as a laminated core, the cutouts being punched out of the sheet metal parts, in particular the sheet metal parts being provided axially one behind the other. The advantage here is that production is simple and eddy currents are also reduced.

In an advantageous embodiment, the number of windings on the stator corresponds to the number of pole areas on the rotor. The advantage here is that the working shaft of the stator field can be used well for generating force.

In an advantageous embodiment, the recesses have a semicircle, C or U-shaped cross section, the opening of the semicircle, C or U being provided in the radial direction outward. The advantage here is that a magnetic transverse direction can be formed which has a small geometric angle to the magnetic longitudinal direction, in particular 360 ° divided by four times the number of pole pairs.

In an advantageous embodiment, the group is formed from a plurality of individual recesses arranged nested in one another. The advantage here is that magnetic poles can be formed in a simple manner and with increased mechanical stability and reduced tendency to oscillate.

In an advantageous embodiment, the recesses are designed to be interrupted, in particular in the area of the plane of symmetry of the recess or of the associated group. The advantage here is that the interruptions lead to a mechanically higher stability. In particular, interruptions in the plane of symmetry improve stability and reduce the tendency to resonance oscillations.

In an advantageous embodiment, the group comprises five individual recesses. The advantage here is that a particularly mechanically stable and inexpensive design can be achieved with a motor with four pole pairs.

In an advantageous embodiment, the recesses are filled with air, plastic or another dia- or paramagnetic substance, the rest of the rotor being made of a ferromagnetic substance. In particular, the recesses are filled with an agent which contributes to holding together the individual sheets stacked on top of one another or which brings about cohesion. The advantage here is that a high level of stability can be achieved. However, in the case of a material with a low density, a lower moment of inertia and thus a higher dynamic range can also be achieved in positioning applications. If air is used, the cohesion must be achieved in another way, such as punch packaging. This type can also be used as an additional holding when using the means for holding together.

In an advantageous embodiment, the recess areas are dimensioned such that the difference in the reciprocal values of the reactance in the magnetic longitudinal direction X_d and in the transverse magnetic direction X_q becomes as large as possible. The advantage here is that the highest possible degree of efficiency, the highest possible torque yield and low production costs can be achieved.

In an advantageous embodiment, the individual teeth are positively connected to one another, in particular by means of a tongue and groove system, the tongues protruding in the circumferential direction from the respective individual number and the groove correspondingly as a recess in the circumferential direction. The advantage here is that a stable cohesion can be achieved; in particular, such a tongue and groove system improves the radial positioning if tongues and grooves are provided to run in the axial direction.

In an advantageous embodiment, the recesses are injected with plastic, in particular the recesses running in the axial direction being provided as connecting webs for plastic end caps provided on the axial end regions, in particular the end caps being manufactured by injection molding. Advantageously, the space for the winding can thus be limited by means of the end caps and the cohesion for the individual teeth is improved. These individual teeth can be held together by means of a retaining ring, which for this purpose can be positively connected to the end caps. The connecting webs run through the cutouts in the axial direction and thus increase the torsional rigidity of each individual tooth.

Further advantages result from the subclaims. The invention is not restricted to the combination of features of the claims. For the person skilled in the art, there are further meaningful possible combinations of claims and / or individual claim features and / or features of the description and / or the figures, in particular from the task and / or the task posed by comparison with the prior art.

• In der 1 ist der Rotor eines erfindungsgemäßen Reluktanzmotors in Schnittansicht gezeigt, wobei in 1a ein Ausschnitt vergrößert dargestellt ist.

The invention will now be explained in more detail with reference to figures:

• In the 1 the rotor of a reluctance motor according to the invention is shown in a sectional view, with FIG 1a a section is shown enlarged.

The sheet metal package 1 of the rotor comprises eight groups 2 of individual recesses 3 . Thus, in the circumferential direction in the area between the groups 2 the polar regions 4th educated. The number of pole pairs is therefore four. The number of groups of recesses distributed symmetrically in the circumferential direction 3 the number of poles of the rotor of the reluctance motor brought about.

The working shaft of the stator field has the same number of poles.

The laminated core of the stator has individual teeth in the circumferential direction, onto each of which individual windings are pushed. The stator is designed with single tooth winding.

The recesses 3 are shaped and dimensioned in such a way that the difference in the reciprocal values of the reactance in the longitudinal magnetic direction X_d and in the transverse magnetic direction X_q becomes as large as possible. In this way, the greatest possible torque can be generated by the reluctance motor with a high degree of efficiency.

The motor is preferably designed with 8 or 10 poles.

List of reference symbols

1

Laminated core

2

Group of cutouts

3

Recess

4th

Pole area

X_d

magnetic longitudinal direction

X_q

magnetic transverse direction

Claims (12)

Reluctance motor, characterized in that the rotor comprises cut-out areas regularly arranged in the circumferential direction, in particular with pole areas being arranged in the circumferential direction between the cut-out areas, and that the stator winding is designed with single-tooth winding, the cut-out areas each being formed from a group of individual cutouts, the The rotor is designed as a laminated core, the cutouts being punched out of the sheet metal parts, in particular the sheet metal parts being provided stacked axially one behind the other, with all the cutouts being interrupted, especially in the area of the plane of symmetry of the cutout or the associated group. Reluctance motor according to Claim 1 , characterized in that a magnetic transverse direction is defined by means of the cut-out areas, in particular when the cut-out areas are designed symmetrically by their respective plane of symmetry. Reluctance motor according to at least one of the preceding claims, characterized in that the stator comprises a laminated core which has individual teeth directed radially towards the rotor in the circumferential direction, onto each of which a winding is provided. Reluctance motor according to at least one of the preceding claims, characterized in that the number of windings of the stator corresponds to the number of pole areas on the rotor, in particular where the number of poles is greater than 4, in particular 8 to 10. Reluctance motor according to at least one of the preceding claims, characterized in that the recesses have a semicircle, C- or U-shaped cross section, the opening of the semicircle, C or U being provided in the radial direction outward. Reluctance motor according to at least one of the preceding claims, characterized in that the group is formed from a plurality of individual recesses arranged nested in one another. Reluctance motor according to at least one of the preceding claims, characterized in that the group comprises five individual recesses. Reluctance motor according to at least one of the preceding claims, characterized in that the recesses are filled with air, plastic or another dia- or paramagnetic substance, the rest of the rotor being made of a ferromagnetic substance. Reluctance motor according to at least one of the preceding claims, characterized in that the recesses are filled with an agent which contributes to holding together the individual sheets stacked on top of one another or which brings about the cohesion. Reluctance motor according to at least one of the preceding claims, characterized in that the recess areas are dimensioned such that the difference between the reciprocal values of the reactance in the magnetic longitudinal direction X_d and in the magnetic transverse direction X_q is as large as possible. Reluctance motor according to at least one of the preceding claims, characterized in that the individual teeth are positively connected to one another, in particular by means of a tongue and groove system, the tongues protruding in the circumferential direction from the respective individual tooth and the groove correspondingly as a recess in the circumferential direction. Reluctance motor according to at least one of the preceding claims, characterized in that the recesses are injected with plastic, in particular wherein the axially extending recesses are connecting webs for plastic end caps provided on the axial end regions, in particular end caps produced by injection molding.

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