Vernier external rotor machine and motor system

Abstract

A Vernier external rotor machine for direct drive of a load is provided. The Vernier external rotor machine includes an external rotor configured to mechanically directly drive to a load.

Claims

1. A motor system, comprising: an external rotor of a Vernier external rotor machine, wherein the external rotor is in the form of a gear wheel, wherein the gear wheel mechanically directly drives a load in the form of a drive chain running around the gear wheel, the external rotor is anisotropic with respect to magnetic properties by way of a tooth structure on an outer circumference of the external rotor forming the gear wheel; a stator having a plurality of stator teeth configured to form a flux modulator of the Vernier external rotor machine; a rotation angle sensor configured to determine a rotation angle position of the external rotor based on the anisotropy of the external rotor; and a frequency converter configured to generate drive signals for windings of the stator, wherein the external rotor includes a housing, the frequency converter is arranged inside the housing, the rotation angle sensor for determining a rotation angle position of the external rotor is integrated into the frequency converter.

2. The motor system as claimed in claim 1, wherein the external rotor includes flux barriers configured to form the anisotropy.

3. The motor system as claimed in claim 1, wherein the frequency converter is configured to convert braking energy which may be present into thermal energy by generating stator winging drive signals which induce a radiofrequency magnetic alternating field in the external rotor.

4. The motor system as claimed in claim 1, wherein the rotation angle sensor is coupled in a signal-transmitting manner to the frequency converter.

5. A motor system, comprising: an external rotor of a Vernier external rotor machine, wherein the external rotor is in the form of a gear wheel, wherein the gear wheel mechanically directly drives a load in the form of a drive chain running around the gear wheel, the external rotor is anisotropic with respect to magnetic properties by way of a tooth structure on an outer circumference of the external rotor forming the gear wheel; a stator having a plurality of stator teeth configured to form a flux modulator of the Vernier external rotor machine; a rotation angle sensor configured to determine a rotation angle position of the external rotor based on the anisotropy of the external rotor; and a frequency converter configured to generate drive signals for windings of the stator, wherein the external rotor includes a housing, the frequency converter is arranged on the outside of the housing, and the rotation angle sensor for determining a rotation angle position of the external rotor is integrated into the frequency converter.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be described in detail below with reference to the drawing, in which:

(2) FIG. 1 shows a drive system according to the invention comprising a Vernier external rotor machine,

(3) FIG. 2a shows a first variant of the drive system according to an embodiment of the invention from FIG. 1,

(4) FIG. 2b shows a further variant of the drive system according to the invention from FIG. 1, and

(5) FIG. 2c shows a further variant of the drive system according to the invention from FIG. 1.

DETAILED DESCRIPTION OF THE DRAWINGS

(6) FIG. 1 shows a schematic cross section through a drive system 6 according to an embodiment of the invention comprising a Vernier external rotor machine 1.

(7) An external rotor 2 of the Vernier external rotor machine 1 is mechanically coupled directly to a load 3 to be driven in the form of a toothed belt. Here, the external rotor 2 is in the form of a gear wheel which directly drives the toothed belt 3.

(8) The external rotor 2 is not laminated and is composed of solid iron. A number of permanent magnets 9 with the illustrated polarity is arranged on an inner side of the external rotor 2.

(9) The external rotor 2 has flux barriers 8 for forming an anisotropy. The flux barriers 8 are formed as teeth or a tooth structure in the solid iron and are uniformly distributed over the circumference of the external rotor 2.

(10) An angle coding can also be realized by means of the flux barriers 8, wherein the flux barriers 8, in contrast to the manner illustrated in FIG. 1, are of angle-dependent design for this purpose.

(11) The stator 4 of the Vernier machine 1 has 12 stator teeth 5. The modulator ring which is usually used is therefore integrated into the stator 4 and can be dispensed with. Windings 10 are associated with the stator teeth 5 in each case, that is to say the stator has a 3-phase, concentrated winding system.

(12) The motor system 6 has a device 7 for determining a rotation angle position of the external rotor 2, wherein the device 7 for determining the rotation angle position of the external rotor 2 is designed to determine the rotation angle position of the external rotor 2 depending on the anisotropy of the external rotor 2. To this end, the device 7 can have, for example, a Hall sensor 12 which generates a signal which is dependent on the anisotropy and is evaluated by means of the device 7 for determining the rotation angle position.

(13) FIG. 2a shows a first variant of the drive system according to an embodiment of the invention from FIG. 1, which drive system is otherwise designed in the manner shown in FIG. 1. The motor system 6 has a frequency converter 13 which is designed to generate drive signals, for example in the form of drive voltages/drive currents with an adjustable amplitude/frequency, for the windings 10 of the stator 4 of the Vernier external rotor machine 1.

(14) The Vernier external rotor machine 1 has a housing 14, for example composed of metal. The frequency converter 13 has a dedicated housing 15 which is mounted onto the housing 14 of the Vernier external rotor machine 1 and is mechanically coupled to said housing.

(15) The frequency converter 13 is designed to convert any braking energy which may be present into thermal energy by generating the drive signals for the windings 10 of the stator 4 of the Vernier external rotor machine 1 in such a way that a radiofrequency magnetic alternating field is induced in the external rotor 2 which is not laminated for this case.

(16) The device 7, shown in FIG. 1, for determining a rotation angle position of the external rotor 2 is integrated into the frequency converter 13. This allows encoder-free control by the converter 13.

(17) FIG. 2b shows a further variant of the drive system according to the invention from FIG. 1, in which drive system, based on the variant illustrated in FIG. 2a, the frequency converter 13 is mounted in axial extension onto the housing 14. Otherwise, the statements made in relation to the embodiment from FIG. 2a correspondingly apply.

(18) FIG. 2c shows a further variant of the drive system according to the invention from FIG. 1, in which drive system, based on the variant illustrated in FIG. 2a, the frequency converter 13 is arranged inside the housing 14. Otherwise, the statements made in relation to the embodiment from FIG. 2a correspondingly apply.

(19) The motor systems 6 shown in FIGS. 2a to 2c contain all of the required drive components in prefabricated form, so that a user of the motor system 6 can integrate said motor system into a drive application directly and without further expenditure on assembly/interconnection.

(20) The converter (electronics) can be attached to the Vernier external rotor machine, for example mounted onto the machine in a dedicated housing, inserted into the motor housing of the machine or axially attached to the machine (in a rigid, rotating manner).

(21) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.