DE102019210525A1 - Monitoring device - Google Patents

Abstract

The invention relates to a monitoring device (12). It is provided that an operating variable (38) from the position encoder (40) of a servomotor (14) is output again directly and without change by the monitoring device (12) and is only detected in between.

Description

The invention relates to a monitoring device according to the preamble of claim 1, a monitoring system according to the preamble of claim 8 and a monitoring method according to the preamble of claim 9.

In the technical field of monitoring and diagnostic technology, it is known to monitor the states of technical systems by evaluating their operating parameters. The monitoring can take place as a pure monitoring of the actual state, which is also known as condition monitoring. The monitoring can also take place predictively, which is known, for example, under the term predictive maintenance.

From the EP 2 292 513 B1 For example, an actuator with an integrated condition monitoring system is known.

The WO 2019/038631 A1 describes a method for operating a ring spinning machine in which spindle drives are monitored by decentralized control modules.

The WO 2017/048788 A1 finally discloses an actuator system with a plurality of sensors with which the condition of an engine can be detected.

Known technical solutions, however, have the disadvantage that they are technically and structurally adapted to a specific application and have to be integrated into a control device, for example.

The object of the invention is thus to create a monitoring device with which different technical systems driven by a servo motor can be monitored without having to intervene structurally in the monitored system. The monitoring device should be able to perform as diverse monitoring tasks as possible and still be of simple construction.

The object is achieved by the subjects of the independent patent claims 1, 8 and 9. Further preferred embodiments of the invention result from the other features mentioned in the subclaims.

• - einen Anschluss für einen Stromsensor;
• - einen Anschluss für eine Betriebsspannung;
• - eine Datenverarbeitungseinrichtung; und
• - eine Ausgabeschnittstelle für ein Überwachungsergebnis.

A first aspect of the invention relates to a monitoring device comprising:

• - a connection for a current sensor;
• - a connection for an operating voltage;
• - a data processing device; and
• - an output interface for a monitoring result.

According to the invention it is provided that the monitoring device comprises a further interface with which at least one operating variable of a position encoder of a servo motor can be looped through the monitoring device and thereby detected.

In other words, the operating variable is output from the position encoder by the monitoring device, which at this point takes on the function of a pure signal line, directly and without change and is only tapped or "listened to" in between. The detection can take place, for example, by measuring a voltage occurring on the signal line.

The monitoring device can thus acquire raw data, for example current and position sensor data, with which the most varied of diagnostic tasks can be carried out without intervening in the servomotor or a control device of the servomotor.

The position encoder is preferably coupled to the further interface via a plug connection.

The current measurement can be carried out, for example, with a Hall effect sensor. The current sensor is preferably clamped to a phase line of the servomotor.

The diagnostic task can be easily and flexibly adapted to the technical system to be monitored, for example by equipping the data processing device with configurable software.

The monitoring device can advantageously be designed as a compact unit and comprise, for example, an industrial PC, microcontroller, single-board computer or the like as the data processing device. The software is preferably also installed on the data processing device. A network connection, a wireless interface or also a display can be provided as the output interface for the monitoring result.

In a preferred embodiment of the monitoring device of the invention it is provided that a supply voltage in the direction of the Position encoder can be output and a measurement signal coming from the position encoder can be looped through the monitoring device.

This ensures that the measurement signals are available for further tasks without delay and the voltage supply of the position encoder is also ensured. The supply voltage for the position encoder can be looped through or provided by the monitoring device from its operating voltage.

The monitoring device can advantageously be connected between a control device of the servomotor and the servomotor and connect them as a pure signal line.

The position encoder and preferably also the control device is preferably coupled to the further interface via a plug connection, clip connection or the like.

Thus, in a further preferred embodiment of the monitoring device of the invention, it is provided that the supply voltage coming from a control device of the servomotor can be looped through in the direction of the position encoder.

In a further preferred embodiment of the monitoring device of the invention it is provided that the measurement signal of the position transmitter can be looped through to the control device.

The function of the monitoring device with regard to the exchange of energy and signals between the control device and the position sensor is therefore limited to pure signal transmission, which significantly reduces the technical complexity.

In a further preferred embodiment of the monitoring device according to the invention, it is provided that the operating variable can be looped through the monitoring device in real time.

This is particularly advantageous with regard to further processing of the position sensor data by the control device.

In a further preferred embodiment of the monitoring device of the invention, it is provided that the data processing device comprises a database for storing the detected operating variable and a diagnostic algorithm for generating the monitoring result.

Because the data can be recorded and evaluated directly in the monitoring device, real-time monitoring can be implemented particularly well.

In a further preferred embodiment of the monitoring device of the invention it is provided that a broadband current sensor is connected to the connection for the current sensor.

The range of diagnostic tasks that can be carried out can thus advantageously be expanded.

Another aspect of the invention relates to a monitoring system, comprising a monitoring device according to the invention according to the preceding description, wherein a current sensor of the monitoring device is operatively connected to a phase line of a servo motor and at least one operating variable of a position encoder of the servo motor via a further interface of the monitoring device through the monitoring device to a Control device of the servomotor looped and can be detected by the monitoring device.

The servomotor can be installed in any drive train. For example, the servomotor can drive a rack via a gear. On the basis of the measured raw data, i.e. at least the position encoder data and the current data, damage to the drive train or to installed rolling bearings can be detected. The drive train can also be part of a vehicle.

• - Betreiben eines Servomotors, der von einer Steuerungseinrichtung angesteuert wird;
• - Messen eines Phasenstroms des Servomotors mit einem Stromsensor eines Überwachungsgeräts, der mit einer Phasenleitung des Servomotors wirkverbunden ist;
• - Durchschleifen wenigstens einer Betriebsgröße eines Lagegebers des Servomotors über eine weitere Schnittstelle des Überwachungsgeräts durch das Überwachungsgerät hin zu der Steuerungseinrichtung des Servomotors und dabei Detektion der Betriebsgröße durch das Überwachungsgerät.

A further aspect of the invention relates to a monitoring method in which a monitoring system according to the invention according to the preceding description is used, comprising the steps:

• - Operation of a servomotor which is controlled by a control device;
• - Measuring a phase current of the servomotor with a current sensor of a monitoring device which is operatively connected to a phase line of the servomotor;
• - Looping through at least one operating variable of a position encoder of the servomotor via a further interface of the monitoring device through the monitoring device to the control device of the servomotor and thereby detection of the operating variable by the monitoring device.

In a preferred embodiment of the monitoring method of the invention, it is provided that the operating variable of the position transmitter and measured values of the phase current are provided with matching time stamps and are stored in a database of a data processing device of the monitoring device.

Thus, the operating variables of the position encoder and the phase current can be related to each other over time can be assigned, which opens up a broad spectrum for further evaluations.

The various embodiments of the invention mentioned in this application can be advantageously combined with one another, unless stated otherwise in the individual case.

• 1 ein erfindungsgemäßes Überwachungssystem.

The invention is explained below in exemplary embodiments with reference to the associated drawing. It shows:

• 1 a monitoring system according to the invention.

1 shows a monitoring system according to the invention 10 . The surveillance system 10 comprises a monitoring device according to the invention 12 as well as a servo motor 14th that drives a technical system not shown here.

The monitoring system also includes 10 a control device 16 who have the servo motor 14th able to control. Also includes the monitoring system 10 a power electronics 18th who have favourited phase lines L1 , L2 and L3 of the servo motor 14th able to supply a motor voltage. The control device 16 transmits the required manipulated variables to the power electronics 18th .

The monitoring device 12 includes a connector 20th for a current sensor 22nd . The current sensor 22nd is in the present case designed as a broadband Hall-effect current sensor and connected to the phase line from the outside L1 clamped.

The monitoring device 12 also includes a connector 24 for an operating voltage of the monitoring device 12 , a data processing device 26th for generating a monitoring result and an output interface 28 for outputting the monitoring result.

The data processing device 26th includes a database for this purpose 30th and a computing device 32 with a diagnostic algorithm 34 . The computing device 32 is here with the database 30th implemented as an example in a single-board computer, which the data processing device 26th forms.

The monitoring device 12 includes another interface 36 . Via this additional interface 36 can be of two sizes 38 of a position encoder 40 of the servo motor 14th through the monitoring device 12 recorded and immediately output unchanged, in other words, looped through.

With the company sizes 38 On the one hand, it is a supply voltage 42 by the control device 16 is generated and via the other interface 36 through the monitoring device 12 to the position encoder 40 is looped through.

In addition, as a company size 38 one from the position encoder 40 generated measurement signal 44 before that via the further interface 36 through the monitoring device 12 to the control device 16 is looped through.

While the measurement signal 44 , which can be a voltage signal, for example, to the control device 16 is looped through, the measurement signal 44 in the monitoring device 12 detected. Purely as an example here in the point P the voltage signal can be monitored.

At the same time it is ensured that the company sizes 38 , especially the measurement signal 44 , in real time and unchanged by the monitoring device 12 be looped so that the measurement signal 44 the control device 16 is available for your control task and the supply voltage 42 the position encoder 40 operates safely.

The detected farm size 38 of the position encoder 40 , here the measurement signal 44 , is in the database 30th filed. Even the one with the current sensor 22nd measured phase current is in the database 30th filed.

To the measured values of the position encoder 40 and the phase current can be better evaluated as raw data for generating the monitoring result, these are provided with matching time stamps when they are detected. The time stamps are stored with the respective measured values in the database 30th filed.

The computing device 32 can then use the diagnostic algorithm 34 and under access to the database 30th generate the monitoring result, which is transmitted via the output interface 28 can be provided.

The monitoring result can be, for example, that there is damage to the servomotor 14th or in the driven technical system, already present or that no damage is threatened or present.

With the monitoring device 10 a variety of monitoring tasks can be carried out with regard to the servo motor 14th and release the powered system. From the measured current information and the values of the position encoder 40 of the servo motor 14th For example, various damage-indicating events can be derived, as these are reflected in the measured values.

List of reference symbols

10

Surveillance system

12

Monitoring device

14th

Servo motor

16

Control device

18th

Power electronics

20th

connection

22nd

Current sensor

24

connection

26th

Data processing device

28

Output interface

30th

Database

32

Computing device

34

Diagnostic algorithm

36

further interface

38

Company size

40

Position encoder

42

Supply voltage

44

Measurement signal

L1

Phase line

L2

Phase line

L3

Phase line

P

Point

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2292513 B1 [0003]
• WO 2019/038631 A1 [0004]
• WO 2017/048788 A1 [0005]

Claims (10)

Monitoring device (12) comprising: - a connection (20) for a current sensor (22); - A connection (24) for an operating voltage; - a data processing device (26); and - an output interface (28) for a monitoring result, characterized in that the monitoring device (12) comprises a further interface (36) with which at least one operating variable (38) of a position encoder (40) of a servo motor (14) is transmitted by the monitoring device ( 12) can be looped and detected. Monitoring device (12) after Claim 1 , characterized in that a supply voltage (42) can be output in the direction of the position sensor (40) as operating variables (38) via the further interface (36) and a measurement signal (44) coming from the position sensor (40) can be output by the monitoring device (12) ) can be looped. Monitoring device (12) after Claim 2 , characterized in that the supply voltage (42) coming from a control device (16) of the servo motor (14) can be looped through in the direction of the position encoder (40). Monitoring device (12) after Claim 2 or 3 , characterized in that the measurement signal (44) of the position encoder (40) can be looped through to the control device (16). Monitoring device (12) according to one of the preceding claims, characterized in that the operating variable (38) can be looped through the monitoring device (12) in real time. Monitoring device (12) according to one of the preceding claims, characterized in that the data processing device (26) comprises a database (30) for storing the detected operating variable (38) and a diagnostic algorithm (34) for generating the monitoring result. Monitoring device (12) according to one of the preceding claims, characterized in that a broadband current sensor is connected to the connection for the current sensor (22). Monitoring system (10), comprising a monitoring device (12) according to one of the preceding claims, wherein a current sensor (22) of the monitoring device (12) is operatively connected to a phase line (L1) of a servomotor (14) and at least one operating variable (38) of a position encoder (40) of the servo motor (14) can be looped via a further interface (36) of the monitoring device (12) through the monitoring device (12) to a control device (16) of the servo motor (16) and can be detected by the monitoring device (12). Monitoring process in which a monitoring system (10) according to Claim 8 is used, comprising the steps of: - operating a servomotor (14) which is controlled by a control device (16); - Measuring a phase current of the servo motor (14) with a current sensor (22) of a monitoring device (12) which is operatively connected to a phase line (L1) of the servo motor (14); - Looping through at least one operating variable (38) of a position encoder (40) of the servomotor (14) via a further interface (36) of the monitoring device (12) through the monitoring device (12) to the control device (16) of the servomotor (14) and thereby Detection of the operating variable (38) by the monitoring device (12). Monitoring procedures according to Claim 9 , characterized in that the operating variable (38) of the position encoder (40) and measured values of the phase current are provided with matching time stamps and stored in a database (30) of a data processing device (26) of the monitoring device (12).

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