Synchronous Reluctance Motor

Abstract

A synchronous reluctance motor includes a stator and a rotor, where a laminate section of the rotor has flux barriers, and where the rotor is formed with a high number of poles.

Claims

1. A synchronous reluctance motor comprising: a stator; and a rotor having a laminate section which includes flux barriers; wherein the rotor is formed with a high number of poles.

2. The synchronous reluctance motor as claimed in claim 1, wherein, on account of the flux barriers, the laminate section has regions having a high conductance formed from iron-based material, and air-filled recesses forming regions having a low conductance.

3. The synchronous reluctance motor as claimed in claim 1, wherein the rotor has at least 6 poles.

4. The synchronous reluctance motor as claimed in claim 3, wherein the rotor has at least 10 poles.

5. The synchronous reluctance motor as claimed in claim 4, wherein the rotor has at least 20 poles.

6. The synchronous reluctance motor as claimed in claim 2, wherein the rotor has at least 6 poles.

7. The synchronous reluctance motor as claimed in claim 6, wherein the rotor has at least 10 poles.

8. The synchronous reluctance motor as claimed in claim 7, wherein the rotor has at least 20 poles.

9. The synchronous reluctance motor as claimed in claim 1, wherein the stator has a number of stator windings adapted to the number of rotor poles.

10. The synchronous reluctance motor as claimed in claim 1, wherein the rotor includes a hollow shaft.

11. The synchronous reluctance motor as claimed in claim 10, wherein a diameter of the hollow shaft is approximately of the rotor diameter.

12. The synchronous reluctance motor as claimed in claim 1, wherein the synchronous reluctance motor comprises a direct drive.

13. The synchronous reluctance motor as claimed in claim 1, wherein the synchronous reluctance motor has an axis height of more than 300 cm.

14. A production machine for performing a plastic-processing method, the production machine including the synchronous reluctance motor as claimed in claim 1.

15. The production machine as claimed in claim 14, wherein the hollow shaft is configured to feed-through an extruder screw.

16. The production machine as claimed in claim 14, wherein the plastic-processing method comprises an extrusion method.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The invention is explained in more detail below with reference to an exemplary embodiment with the aid of the FIGURE, in which:

[0026] The FIGURE is cross-sectional illustration of the synchronous reluctance motor in accordance with the invention.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0027] The FIGURE shows, schematically, a cross section through a motor having a rotor and a stator, where the cross section extends along a plane, which is perpendicular to the axis of rotation of the armature. A cross section of this kind is also referred to as a laminate section. The motor is a synchronous reluctance motor 10 in accordance with an exemplary embodiment of the invention. Here, the stator 11, as is usual in synchronous motors, is constructed from windings, which are energized individually or in groups or one after another via a converter in order to be able to generate a changing magnetic field. The rotor 12 is located inside the stator 11.

[0028] Depicted is a laminate section of the rotor 12 having flux barriers 13, which are typical of a synchronous reluctance motor. The flux barriers 13, or the alternating regions of flux barriers 13 and, for example, regions made of iron, which form the basis of the rotor 12, are responsible for the physical effect of the torque generation on account of the reluctance. A stack of flux barriers appears, for example, in a form such that a plurality of arcuate flux barrier sections are arranged concentrically around an imaginary center point of the rotor. The opening of the arcuate sections points toward the outside, here. The recesses that form the flux barriers accordingly increase in length and width toward the inside.

[0029] In the illustrated example, a twelve-pole rotor 12 is illustrated. A first pole 1 has in each case an associated second pole 2, with which the first pole 1 forms what is known as a pole pair. A third pole 3 likewise has an opposite pole 4. In particular, only an even number is possible as the number of poles for a rotor.

[0030] The number of poles provided stipulates, at the same time, the dimensions or the extent of a flux barrier stack that forms a pole. The more poles that are provided, the smaller an imaginary diameter of the flux barrier arcs for each pole. Here, an expedient minimum size of a flux barrier stack should be adopted and the size of the design of the motor should be adapted accordingly. At the same time, the region on the laminate section that cannot contribute to the formation of the interfacial forces at the transition between the air and the iron becomes larger accordingly. The region can be disregarded with respect to a reluctance torque that can be generated. At the same time, however, precisely the region, in which a relatively large hollow shaft is provided in the armature, can be used advantageously used.

[0031] A synchronous reluctance motor having a high number of poles entails the advantages, as illustrated above, that high torques can be generated at low rotational speeds and consequently an embodiment as a direct drive is possible. It is consequently possible to omit a transmission. A hollow shaft can be provided inside the armature and can be used advantageously for applications in which large forces are required and at the same time cost-effective motors are intended to be used. The low costs are produced, in particular, through the omission of magnets and, instead of this, the use of synchronous reluctance technology. On account of the embodiment with a high number of poles, it is nevertheless possible to generate high torques. At the same time, a high degree of energy efficiency in the entire operating range is ensured, i.e., during partial load and full load.

[0032] Although the invention has been described and illustrated in detail by way of the exemplary embodiment, the invention is not restricted by the disclosed examples and other variations can be derived herefrom by a person skilled in the art without departing from the scope of protection of the invention.

[0033] Thus, while there have been shown, described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.