DE10362240B4 - compact drive - Google Patents

Abstract

Compact drive, comprising at least one electric motor, a transmission and a converter, wherein the output shaft of the transmission and the rotor shaft are arranged parallel to each other and the axial distance is determined at least by a spur gear of the transmission or by the execution of a variable speed.

Description

The invention relates to a compact drive.

From the DE 197 14 784 A1 a compact drive is known which comprises an electric motor, at one end face of a transmission and at the other end side of a converter is arranged. The electronics area or the motor area must be sealed against the gearbox. The disadvantage here is that a large axial length is available and only on one end face of the compact drive an output can be provided.

From the DE 42 25 534 A1 an arrangement for operating electric motors in underground operations is known.

From the DE 199 11 217 A1 For example, an inverter system is known that includes an inverter and supply lines.

From the DE 199 81 897 T5 is known as the closest prior art, a geared motor.

The invention is therefore the object of developing a compact drive while avoiding the aforementioned disadvantages. In particular, axial length should be saved and as many output variants, ie one-sided and double-sided output be executable.

According to the invention the object is achieved in the compact drive according to the features specified in claim 1.

Essential features of the invention in the compact drive are that it comprises at least one electric motor, a transmission and a converter, wherein the output shaft of the transmission and the rotor shaft are arranged parallel to each other, wherein the compact drive at least one electronic circuit for Aufmodulation or demodulation of information comprising the compact drive supplying power lines.

The advantage here is that axial length can be saved and one-sided and double-sided downforce is executable.

In an advantageous embodiment, the electric motor is a synchronous motor. The advantage here is that highly dynamic positioning tasks can be performed by the compact drive and / or a high torque over the entire speed range is available.

In an advantageous embodiment of the inverter is arranged laterally of the rotor shaft. The advantage here is that length can be saved and both sides of the output shaft are accessible, so a bilateral output is providable.

In an advantageous embodiment of the transmission area is sealed against the environment and against the area of the engine and against the electronics area. The advantage here is that the transmission range may include lubricating oil and the electronics and the stator and rotor parts remain protected from the lubricant.

In an advantageous embodiment, the transmission area, the area of the engine and the electronics space area are at approximately the same temperature level. The advantage here is that no thermal insulation is necessary and thus material, mass and cost can be saved.

In an advantageous embodiment, the motor comprises a transmitter arranged at one end of the rotor shaft. The advantage here is that the compact drive can be used for positioning tasks and the encoder is protected by the housing of the compact drive. At the other end of the rotor shaft, a brake can be connected, which can also be estimated from the housing of the compact drive. In a further advantageous embodiment, the motor contains no encoder, but the position is determined by means of an estimation method whereby axial space is saved.

A significant advantage of the invention is also that the rotor shaft remains completely inside the housing and thus no seals from the rotor shaft to the environment are necessary. So it is sufficient so a single shaft seal, which runs on the rotor shaft. Since the rotor shaft can have a high speed, thus the heat production is much smaller than in a motor having two shaft seals, in particular at its two axial ends of the rotor shaft.

The output shaft has, for example, three shaft seals. But since the speed is much lower than in the rotor shaft, the total production of heat is smaller than in a drive solution in which both the rotor shaft and the output shaft has two shaft seals.

In an advantageous embodiment of the transmission, at least one spur gear is used, whereby the axial length decreases and a cost-optimal solution arises.

In an advantageous embodiment, the gear stage is as adjusting with a variable transmission ratio, whereby the wear of the gear stage of the speed range minimized and the torque ratio is adapted to the load case. It is advantageous in the case of the adjusting mechanism that even all seals to the engine compartment can be dispensed with, since an adjusting mechanism, in particular a wedge-belt transmission, requires no or only negligible quantities of lubricant. Thus, only seals from the interior of the compact drive to the outside environment are necessary.

In an advantageous embodiment, rotor shaft and at least one shaft of the transmission are mounted in the same housing part. The advantage here is that an accurate alignment of the waves each other already during the manufacture and processing of the housing part can be achieved. Because the housing part is finished in only one clamping and thus the relative position of the bearing seats aligned with each other very precisely.

Further advantages emerge from the subclaims.

The invention will now be explained in more detail with reference to figures:
In the 4 an inventive compact drive is drawn in an oblique view, wherein the transmission 40 only symbolically indicated.

In the 1 an inventive compact drive is drawn in an oblique view.

In the 2 an inventive compact drive is shown cut.

In the 3 an inventive compact drive is shown cut, in which, in contrast to 2 the inverter is disposed on the other side of the output shaft than the engine.

The symbolically indicated gearbox in 4 is executed in different embodiments of the invention in each case different. In a first variant, it is designed as a spur gear, which in the 2 and 3 also clarified. In another variant, the transmission is off 4 designed as adjusting. This variator is executable either in the manner of a VARIMOT transmission from SEW-EURODRIVE, ie with two discs rubbing against each other, or in the manner of a VARIBLOC transmission from SEW-EURODRIVE executable, ie as Breitkeilriemengetriebe the distance between two tapered adjusting the Determine translation. In a further embodiment of the invention, a chain is advantageously used instead of a V-belt.

According to the embodiment according to the invention 2 the motor is arranged laterally from the output shaft. The rotor shaft 13 and the output shaft 8th are therefore arranged in parallel. The center distance of these shafts is determined by the teeth of the spur gear, the one with the rotor shaft 13 positive and / or non-positively connected pinion 14 and a gear designed as a spur gear 10 that with the output shaft 8th is connected exists.

The spatial region of the transmission, that is to say the spur gear stage, is designed to be sealed off from the spatial region of the electric motor. The shaft seal 15 seals these areas of space on the rotor shaft, since the rotor shaft in the space region of the motor, the permanent magnets 12 carries and in the space area of the transmission, the pinion 14 , The shaft seal 5 seals the room area of the gearbox from the area of the engine to the output shaft 8th from, which is designed as a hollow shaft.

In a further embodiment according to the invention, instead of the spur gear stage shown another gear, comprising a plurality of gear stages, can be used.

In a further embodiment of the invention, the output shaft is not hollow shaft but formed as a solid shaft. Furthermore, it is also possible to design the output shaft in accordance with the standard for robot interfaces, resulting in a very compact output with a small axial length.

The output shaft 8th is about the camp 1 in the same housing part 21 stored, in which also the rotor shaft 13 over the camp 18 is stored.

By means of on the output shaft 8th running and in the housing cover 3 used shaft seal 2 the space area of the motor is sealed against the environment.

The housing parts 21 and 22 are with coolers 4 provided for dissipating the heat generated in the engine, transmission and inverter.

The output shaft 8th is over the other, axially opposite bearing ( 6 . 9 ) again in the same housing part 22 stored, in which also the rotor shaft 13 over the other camp 20 is stored.

A major advantage of the compact drive is that no coupling between the engine and gearbox is necessary and thus eliminates additional parts. In particular, motor and gearbox even use the same housing parts together. In addition, an accurate alignment of the waves reach each other already in the manufacture and processing of the housing part by bearing seats for engine and transmission, in particular the bearings 9 and 20 , in their relative position to each other during manufacture are very precisely defined. For the housing part can be finished in only one machine tool in a single clamping and thus the relative position of the bearing seats very precisely aligned with each other. Another advantage of the common use of a housing part is that the compact drive in this way not only requires a small volume of construction but also has a particularly high stability, since the forces of the engine and the transmission are conducted within the same housing part to each other.

By means of on the output shaft 8th running and in the housing part 22 used shaft seal 7 the area of the gearbox is sealed against the environment.

The stator 11 with the stator windings 16 is around the rotor shaft 13 arranged around.

This electric motor is designed as a multi-phase synchronous motor. However, in other embodiments of the invention, any other motors can be integrated into the compact drive instead of the synchronous motor.

The running on the rotor shaft, in the housing part 22 used shaft seal 15 seals the room area of the gearbox from the room area of the engine.

The electronics room area 17 for the inverter is not sealed to the room area of the motor.

The motor carries at its one axial end a resolver, the Resolverstator 19 and a resolver rotor 23 includes.

In other embodiments of the invention, other angle sensors or angular velocity sensors can be provided instead of the resolver. Also, in other embodiments of the invention on the opposite side of the angle sensor, a brake in the compact drive can be integrated.

In yet other embodiments of the invention, the inverter is operated such that, by a method, the angle value is estimated using a suitable engine model. Thus, further axial length can be saved.

In the 2 another variant of an embodiment of the invention is shown in which the electronics space area is not directly to the spatial area of the engine but the output shaft 8th lies in between. In this example, then seals the shaft seal 5 the space area of the transmission from the electronics space area, wherein the shaft seal 5 on the output shaft 8th runs and in the housing part 21 sitting.

The gear area is filled with lubricant, such as lubricating oil, grease or the like.

In the embodiments of the invention shown, no particularly effective thermal insulation between the spatial areas of the inverter, so the electronics room area, and the transmission room area and the engine compartment area is provided. Thus, the space areas are at about a same temperature level. An approximately equal temperature level means a temperature difference of a maximum of 10 ° Celsius in continuous operation with nominal load. Of course, in the case of sudden operation, a larger temperature difference of the room areas can be achieved in the short term. Advantageous and surprising in this design that no special insulation is needed and thus material, mass and cost can be saved.

In other embodiments of the invention also thermal insulation between two or more of the space areas are providable.

In further embodiments according to the invention, the motor is designed to be highly poled, in particular eight- or ten-pole. The engine is advantageous in the manner of DE 100 49 883 A1 executed or by type DE 103 17 749 A1 , Thus, in compact drive, a single gear stage together with such a polyphase motor is sufficient to cover a wide range of gear ratios.

In further embodiments of the invention is designed as a output shaft no hollow shaft but a cylindrical stub shaft, said output shaft is connected by keyed connection with the device to be driven.

In further embodiments of the invention, the output shaft and the output-side housing part is designed in the manner of the robot interface EN-ISO 9402-1. Thus, axial length can be saved and a high torque transferable. In addition, compatibility is achieved with corresponding, to be driven and connected devices.

The electrical connection devices are provided on the back of the housing and therefore in the 1 to 4 not visible. In other embodiments of the invention, however, other positions for the connection devices are providable.

In further embodiments of the invention, the connection devices are designed only as a power supply. In particular, only power cables are led to the compact drive. The data transmission to or from the converter, which is necessary for data communication, to another, in particular higher-level, unit takes place by means of modulation on these power lines. The modulation can be carried out in a known manner, in particular as is known from power line communication or according to the FSK or according to the FH / PSK method, ie frequency hopping phase shift keying.

LIST OF REFERENCE NUMBERS

1

camp

2

Shaft seal

3

housing cover

4

coolers

5

Shaft seal

6

camp

7

Shaft seal

8th

output shaft

9

camp

10

gear

11

stator

12

permanent magnets

13

rotor shaft

14

pinion

15

Shaft seal

16

stator

17

Electronics space region

18

camp

19

resolver

20

camp

21

housing part

22

housing part

23

resolver

31

Electronics space region

40

transmission

Claims (4)

Compact drive, comprising at least one electric motor, a transmission ( 40 ) and an inverter, wherein the electric motor is a synchronous motor and / or a permanent-magnet motor, wherein the electric motor comprises a transmitter, wherein the output shaft ( 8th ) of the transmission ( 40 ) and the rotor shaft ( 13 ) are arranged parallel to each other wherein at least one gear stage is designed as a spur gear stage, and the axial distance is determined by at least one gear stage is wherein rotor shaft ( 13 ) and at least one shaft of the transmission ( 40 ) are mounted in the same housing part, which is also the electronics room area ( 17 ) is at least partially limited, wherein the compact drive comprises at least one electronic circuit for modulating or demodulating information on the compact drive supplying power lines, wherein the compact drive electrical connection devices are arranged, to which the power lines are guided and wherein the connection devices are designed to power the compact drive , wherein the inverter is laterally of the rotor shaft ( 13 ) and wherein only a single shaft seal ( 15 ) on the rotor shaft ( 13 ), which covers the spatial area of the transmission ( 40 ), so the Stirnradgetriebestufe, from the space region of the electric motor seals, with exactly three shaft seals ( 2 . 5 . 7 ) on the output shaft ( 8th ), one ( 7 ) of the three shaft seals ( 2 . 5 . 7 ) the spatial area of the transmission ( 40 ) seals against the environment, on the output shaft ( 8th ) and in the housing part ( 22 ), one ( 5 ) of the three shaft seals ( 2 . 5 . 7 ) the spatial area of the transmission ( 40 ) from the space region of the electric motor to the output shaft ( 8th ), one ( 2 ) of the three shaft seals ( 2 . 5 . 7 ) seals the space region of the electric motor against the environment, wherein the transmission area against the environment and against the area of the electric motor and against the electronics space area ( 17 ), wherein the housing consists of two housing parts ( 21 . 22 ) and a housing cover ( 3 ), wherein the output shaft ( 8th ) over the camp ( 1 ) in the same housing part ( 21 ) is mounted, in which also the rotor shaft ( 13 ) over the camp ( 18 ), wherein the output shaft ( 8th ) over the other, axially opposite bearing ( 6 . 9 ) again in the same housing part ( 22 ) is mounted, in which also the rotor shaft ( 13 ) over the other camp ( 20 ), wherein the electrical connection devices for power lines are provided on a housing part of the compact drive. Compact drive according to claim 1, characterized in that the electronic circuit is designed such that the modulation on the FSK or according to the FH / PSK method, ie after the frequency hopping phase shift keying, is provided. Compact drive according to one of the preceding claims, characterized in that the transmission area, the area of the engine and the electronics area ( 17 ) are at a same temperature level. Compact drive according to claim 1, characterized in that the encoder is a resolver stator ( 19 ) and a resolver rotor ( 23 ).

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