CN213120652U - System for monitoring a geared motor - Google Patents

Abstract

The utility model relates to a system for monitoring gear motor, this system includes the evaluation unit that is formed by motor drive's reduction gear and module, this motor is supplied power by the dc-to-ac converter, a plurality of sensors have been arranged on the reduction gear, wherein, evaluation unit has the evaluation module that is used for analysis processing sensor signal, a central module for implementing the control and the power module that is used for evaluation module and central module power supply, evaluation module, central module and power module are arranged one after the other, evaluation module and central module are supplied power by power module in parallel, each sensor is connected with the evaluation module electricity of one-to-one distribution for one of them, in order to give corresponding sensor signal transmission to corresponding evaluation module, every evaluation module is connected with central module with the help of wireless or wired data transmission passageway, in order to be confirmed by corresponding sensor signal, the evaluation unit that is connected with the wire, The measured values of the respective physical parameters are transmitted to the central module.

Description

System for monitoring a geared motor

Technical Field

The utility model relates to a system for be used for monitoring gear motor.

Background

It is known to detect the rotational speed of the rotor shaft of an electrical machine.

SUMMERY OF THE UTILITY MODEL

The object of the invention is therefore to achieve a flexible, adaptable drive and also to ensure a high degree of safety.

According to the invention, the object is achieved by a system having the following features.

An important feature of the system according to the invention is that the system comprises a reduction gear driven by a motor supplied by an inverter and an evaluation unit formed modularly, on which a plurality of sensors are arranged, wherein the evaluation unit has a plurality of evaluation modules, a central module and a power supply module.

The advantage here is that the modular design of the evaluation unit enables the addition of further evaluation units and therefore further sensors by means of these evaluation units, so that the central module can carry out an improved evaluation. The number of evaluation units and thus also the number of sensors can be adapted to the respective drive task. The cost and effort can thus be flexibly adapted. For example, sensors can also be provided for detecting the torque output at the output shaft and/or the rotational speed output at the output shaft and transmitting it to the central module. The central module is connected with an indicating component for indicating warning information and a controller for driving and controlling an inverter for supplying power to the motor. The safety is thus also increased, since sensors can be added in a simple manner, and thus improved monitoring of the retarder, in particular improved condition monitoring, can be carried out by the central module.

The evaluation module, the central module and the power supply module are arranged one next to the other. The advantage here is that the modules can be arranged in a row one behind the other and can thus form a clear construction of the evaluation unit. Furthermore, it is possible to simply add further modules at the end without changing the remaining evaluation units in terms of hardware.

The evaluation module and the central module are powered in parallel by a power supply module. The advantage here is that the evaluation module and the central module can be supplied with dc voltage by a power supply module which is fed by an ac voltage supply network. The power supply module has a rectifier, in particular a smoothing capacitor. Preferably, the dc voltage supply is looped through the evaluation modules, which are arranged one behind the other in series in contact with one another being electrically plugged.

Each sensor is electrically connected to an associated evaluation module in order to transmit the respective sensor signal to the respective evaluation module. The advantage here is that the sensor signals can be processed separately. In particular, low pass filtering, amplification and/or compensation voltages for the sensor signal may be used or added. Furthermore, the analog signals can be converted into a digital data stream, which is supplied to a central module.

Each evaluation module is connected to the central module by means of a wireless or wired data transmission channel in order to transmit the measured values of the respective physical parameter determined from the respective sensor signal to the central module. The advantage here is that the data detected and processed by the sensors can be transmitted to the central module. The signals of the various sensors can therefore be evaluated with respect to one another, and the evaluation results can be monitored, in particular the state, for an inadmissibly high degree of deviation from the target value or the target value range.

In an advantageous embodiment, each evaluation module has its own housing. The advantage here is that the signal processing can be carried out within the respective module without interference from interfering signals of other modules.

In an advantageous embodiment, the central module has means for evaluating measured values of a plurality of physical parameters with one another, the evaluation results being supplied to the means for monitoring, which are connected to the means for indicating warning information and/or to the means for switching off the electric machine. The advantage here is that an improved monitoring can be achieved. This is because monitoring only the value of a single parameter over a threshold value may lead to errors, since fluctuations may distort the monitoring, in particular because they occur around the threshold value. According to the utility model discloses, make a plurality of parameter phase operations, consequently formed more sensitive combination parameter. Preferably, the means for monitoring comprises means for storing a preset threshold value and means for comparing the result of the operation with the preset threshold value.

In an advantageous embodiment, the first sensor is adapted to detect the oil level, in particular the fill level of the oil present in the gear unit. The advantage here is that the filling level is monitored and can be calculated with other parameters. Thus, a combination parameter of the calculation can be formed, to which also the signals of other sensors, which also generate a changing signal when the oil level drops, can be supplied. For example, the structure-borne sound amplitude averaged over a frequency band may be increased.

In an advantageous embodiment, the second sensor is suitable for detecting vibrations of the retarder. The advantage here is that the structure-borne noise amplitude of the gear unit, in particular in the vicinity of the bearings of the gear unit, can be determined and can be evaluated with the sensor signals of the other sensors.

In an advantageous embodiment, the third sensor is suitable for detecting the temperature of the gear unit, in particular the third sensor is an infrared sensor and/or the third sensor is arranged inside a housing part of the gear unit. The advantage here is that the signal of the third sensor can be calculated with the signals of the other two sensors, so that different physical parameters can be determined which change its signal when the oil level drops.

In a method for monitoring a geared motor, in particular a method implemented by the above-described system, it is an important feature that the geared motor has a gear unit which is at least partially filled with oil, wherein a value of an oil level, in particular a filling height of the oil, is detected and a value of a vibration at least one point of the gear unit is detected, wherein a first parameter is formed by calculating the value of the oil level and the value of the vibration, and whether a deviation of the value of the first parameter from a target value exceeds an allowable degree or whether the first parameter exceeds a threshold value is monitored.

The advantage here is that if the oil level drops, the calculated parameter changes its signal.

In an advantageous embodiment, the warning message is indicated and/or forwarded and/or the safety state of the motor which is supplied by the inverter and which drives the retarder is indicated and/or activated in the event of an excess. The advantage here is that an improved security can be achieved.

In an advantageous embodiment, the calculation comprises a division, wherein the first parameter is formed as a quotient of a value of the oscillation and a value of the oil level. The advantage here is that simple mathematical operations are sufficient for increasing the sensitivity.

In an advantageous embodiment, the calculation comprises a division, wherein the first parameter is formed as a quotient of the product of the value of the oscillation and the value of the retarder temperature and the value of the oil level. The advantage here is that a high sensitivity can be achieved by simple mathematical operations and thus monitoring can be carried out efficiently.

In an advantageous embodiment, the value of the oscillation is an average value of a fourier-transformed time profile of the value of the oscillation, in particular an average value in a frequency band. The advantage here is that if the lubricity of the bearing deteriorates, the frequency of the frequency band generated by the bearing has a great influence on this value.

The present invention is not limited to the above-described combinations of features. The above-described combinations of features or other possible combinations of the individual features described above and/or of the features described below and/or of the features of the drawings may be made possible for a person skilled in the art, especially if this object is set forth for the purpose and/or is set forth by comparison with the prior art.

Drawings

The utility model is described in detail below according to the attached drawings:

fig. 1 schematically shows a monitoring system according to the invention.

List of reference numerals:

1 housing part

2 input shaft, in particular drive shaft

3 oil level sensor

4 temperature sensor

5 vibration sensor, in particular structure-borne noise sensor

6 output shaft

7 evaluation unit

8 Central module

9 Power supply module

13 first evaluation module

14 second evaluation Module

15 third evaluation Module

Detailed Description

The gear unit has a housing part 1 in which bearings are accommodated for supporting shafts, to which the toothed part is connected in a rotationally fixed manner.

The input shaft 2, in particular the drive shaft, is connected to the rotor shaft of the electric machine in a rotationally fixed manner or by way of a coupling device.

The output shaft 6 may be connected to a load to be driven.

Sensors, in particular an oil level sensor 3 for detecting the oil level enclosed by the housing part 1, a temperature sensor 4 for detecting the temperature inside the housing part, and a vibration sensor 5, in particular a structure-borne sound sensor, for detecting mechanical vibrations, in particular acoustic vibrations, of the housing part 1 are arranged on or in the housing part 1.

The signals of the sensors are supplied to a modular evaluation unit 7 shown in fig. 1.

The evaluation unit 7 has an evaluation module, a central module 8 and a power supply module 9, which are arranged next to one another. In this case, the evaluation module and the central module are supplied in parallel by the power supply module.

The sensor signal of the fuel level sensor 3 is supplied to a first evaluation module 13 of the evaluation modules, the sensor signal of the temperature sensor 4 is supplied to a second evaluation module 14 of the evaluation modules, and the sensor signal of the vibration sensor 5 is supplied to a third evaluation module 15 of the evaluation modules.

The central module 8 is connected to the evaluation module by means of a data transmission channel.

The measured values detected and determined by means of the sensors and the evaluation module are evaluated in a central module, wherein a condition monitoring is carried out.

In this case, the monitoring of the measured values takes place in the central module in such a way that a warning signal and/or a shutdown signal is emitted if a deviation from a defined range is exceeded to an acceptable extent.

In this case, the shutdown signal, in particular via an inverter that supplies the electric machine, causes a shutdown of the electric machine or activates a safety state of the electric machine. The safety state need not necessarily be a standstill of the rotor shaft, but can also be a regular, preferably uniform rotation of the rotor shaft of the electric machine.

In the central module, the measured values determined by the evaluation module are evaluated with one another and monitored as a function thereof.

For example, a first parameter may be formed that includes a quotient formed by a product formed by the detected temperature and a value determined by a vibration value detected by means of the vibration sensor and an oil level value of the detected oil level.

As the value determined from the vibration value detected by means of the vibration sensor, the amplitude of the filtered frequency or the average amplitude of the frequency band is exemplarily used. The signal of the vibration sensor 5 is preferably fed to an FFT and the fourier spectrum for the frequency band thus determined forms a value of the mean amplitude and/or an integral of the amplitude as a function of the frequency.

If, for example, the oil level drops, so that the lubrication of the bearings and/or of the toothed parts meshing with one another deteriorates, the value determined from the vibration value detected by means of the vibration sensor increases, as does the friction of the toothed parts in engagement.

The first parameter reacts extremely strongly by the resulting operation, in particular the formation of the quotient and product. This is because a slight drop in the oil level may cause a small vibration increase and a temperature rise. A significant change in the value of the first parameter is obtained by multiplication and division. I.e. a high sensitivity to changes is achieved in this way.

Mathematically similar operations may also be used in the refinement.

It is additionally possible to detect the motor current by means of a sensor for detecting the motor current of the motor and to transmit the signal of this sensor to a further evaluation module. The values thus determined are supplied from there to a central module, which calculates these values determined from the detected motor currents with the values of the other sensors, in order to monitor the calculation result for inadmissibly large deviations from the permissible values.

In a further exemplary embodiment according to the present invention, an RMS value, in particular in a frequency band, i.e. in particular a root mean square value, of the fourier transformed curve of the change in the value detected by the vibration sensor 5 is formed. The quotient of this RMS value and the value determined from the signal of the fuel level sensor 3 is thus formed and monitored for an inadmissibly high degree of deviation from the threshold value. Thus, parameters very sensitively reacting to changes due to the deterioration of the lubrication are available for monitoring.

Claims (9)

1. A system for monitoring a geared motor, characterized in that the system comprises a gear unit driven by the motor, which is supplied with power from an inverter, and a modularly formed evaluation unit on which a plurality of sensors are arranged, wherein,

the evaluation unit has a plurality of evaluation modules, a central module and a power supply module,

the evaluation module, the central module and the power supply module are arranged one next to the other,

the evaluation module and the central module are powered in parallel by a power supply module,

each sensor is electrically connected to an associated evaluation module for transmitting a respective sensor signal to the respective evaluation module,

each evaluation module is connected to the central module by means of a wireless or wired data transmission channel in order to transmit the measured values of the respective physical parameter determined from the respective sensor signal to the central module.

2. The system of claim 1, wherein each evaluation module has its own housing.

3. System according to claim 1 or 2, characterized in that the central module has means for inter-operating measured values of a plurality of physical parameters, the results of the operation being fed to the means for monitoring which are connected to the means for indicating an alarm message and/or to the means for switching off the electric machine.

4. A system according to claim 3, characterized in that said means for monitoring comprise means for storing preset threshold values and means for comparing the result of the operation with corresponding threshold values.

5. A system according to claim 1 or 2, wherein the first sensor is adapted to detect the oil level.

6. The system of claim 5, wherein the first sensor is configured to detect a fill level of oil present in the retarder.

7. A system according to claim 1 or 2, characterised in that the second sensor is adapted to detect vibrations of the retarder.

8. System according to claim 1 or 2, characterized in that the third sensor is adapted to detect the temperature of the retarder and/or that the third sensor is arranged inside the housing part of the retarder.

9. The system of claim 8, wherein the third sensor is an infrared sensor.

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