DE102007017708A1 - Electric motor arrangement i.e. compact servo actuator, has oscillation detection unit detecting oscillations of motor unit and outputting signal, where detection unit is arranged in such manner that signal is outputted to control unit - Google Patents

Abstract

The arrangement (1) has a drive control unit (6) controlling movements of a motor unit (2). A converter (4) is arranged at the motor unit. A permanent oscillation detection unit (10) e.g. vibration absorber, is arranged in a housing (5) of the converter, and integrated into a drive control unit. The detection unit detects mechanical oscillations of the motor unit and outputs a signal. The detection unit is arranged in such a manner that the signal is outputted to the drive control unit. The arrangement is arranged in such a manner that the signal is set in relationship with a kinetic momentum. An independent claim is also included for a method for operating a motor arrangement.

Description

The The present invention relates to an electric motor, and more particularly an electric motor which is formed together with a converter is. Such electric motors are known from the prior art. It is also known from the prior art, such electric motors in regular intervals with Check diagnostic units, for example whether imbalances are turned on, which in the long run the Shorten the life of the engine. More specifically, it is checked for maintenance and diagnostic purposes with a vibration detecting device, for example Imbalance of the motor shaft or the like occur.

It However, it has been shown that the occasional review of electric motors with Help of such vibration detection devices often is not sufficient, given existing changes or deterioration already within the shortest possible time Time further to some even more significant deterioration after can draw.

The Object of the present invention is therefore a motor assembly to disposal to provide a substantially permanent monitoring of the electric motor with respect to mechanical vibrations allowed. In addition to a possibility be created, possibly occurring vibrations with others or drive-specific system variables such as torque and to match the speed directly.

This is inventively the object achieved by claim 1. Advantageous embodiments and further developments are the subject of the dependent claims.

The inventive motor assembly has a motor unit, as well as an inverter, the motor unit provided. In addition, a drive control unit is provided, which controls the movements of the motor unit.

According to the invention the motor assembly a permanent and in particular stationary on the motor assembly arranged vibration detection device, which mechanical Detects vibrations of the motor unit and outputs a first signal, which for This mechanical vibration is characteristic. Next to it is According to the invention, the vibration detection device designed such that the signal to the drive control unit is issued. This will be under a movement of the motor unit a movement of the abutment across from the primary part understood, with this movement, for example, transmitted to an output shaft becomes. In a preferred embodiment The first signals are sent directly via a conductor connection the vibration detection device to the drive control unit output. However, it is also possible the first signals first evaluate in an evaluation unit.

Under a motor unit is in the context of the present invention that unit of the engine understood the rotational movement generated. In particular, such a motor unit has a primary part and a primary part across from movable abutment or in a specific embodiment a stator and a rotor rotatably arranged with respect to this stator.

Of the Inverter or inverter serves to power the motor unit. However, the drive control unit is in particular not exclusively to a drive processor that controls the motor unit. The term Inverter is also used below for inverters.

In order to it is preferably an inverter motor, especially the constructive unit consisting of a three-phase motor and a converter to their feeding. Preferred is the inverter with an accelerometer equipped, that of a drive processor d. H. the drive control unit, is evaluated. Under a vibration detection device is understood a device that mechanical vibrations or mechanical Can detect movements. For example, a structure-borne noise sensor will also be used understood as vibration detection device.

Especially Preferably, this vibration detection device itself with the stator or a housing connected to the motor assembly.

Especially Preferably, the motor arrangement or the converter is designed such that the first signal having at least one characteristic for the operation Movement size in relation is set. This characteristic relationship is included from a group of relationship sizes that the Speed, torque or the like contains.

Particularly preferably, the vibration detection device is integrated into the drive control unit, for example, arranged with this on a common board and particularly preferably potted with this. In this preferred embodiment, the integrated vibration detection device with evaluation in the drive control unit not only provides a cost-effective alternative to separate vibration detection systems, but also offers the possibility of vibration with other drive-specific Sys temgrößen, such as the torque or the speed directly. In addition, it is also possible to provide an evaluation unit for evaluating the first signals, wherein this evaluation unit is preferably likewise integrated into the drive control unit.

there Is it possible, the processed in the drive or in the drive control or at least cached metrics resulting from the first Signals to a higher-level control to hand over.

at A further advantageous embodiment is the vibration detection device in the inverter or a housing of the inverter or together with the inverter in a common housing integrated. In this way, a particularly cost-effective production of entire engine arrangement allows. It would be, however also conceivable, the vibration detection device between the housings to arrange the motor unit and the inverter.

at a further preferred embodiment is the inverter or its housing directly to a housing of the Motor unit connected. Particularly preferred is the inverter or its housing with the housing bolted to the motor unit. Through this procedure, structure-borne noise Although the motor unit indirectly, but still good enough transmit the vibration detection device. The evaluation of the signals are output by the vibration detection device, as mentioned above, in the drive control unit or the drive processor, wherein the vibration signal in the time and / or frequency domain analyzed and characteristic values are calculated.

at a further preferred embodiment the motor arrangement or the converter has a signal output device on, the output of predetermined first signals an output signal outputs. This output signal may, for example, at a warning or a fault message act in dependence is generated by a comparison with limit values. In this embodiment The motor arrangement has a memory device in which allowable limit values are stored and a comparator, which are the first signals or the measured values resulting from these first signals compares these limits. In a further advantageous embodiment the inverter is arranged on the motor unit. More precisely is the inverter as part of the inverter motor so on or in the Motor device arranged that the vibration detection device Can detect vibrations of the engine. At the engine unit acts It is particularly preferably a three-phase motor.

Preferably is the inverter in a housing arranged. In a further preferred embodiment, the inverter can be arranged on the motor unit, d. H. He can essentially be firm with the motor unit to be connected. Preferably, the vibration detection device is directly on a housing the motor unit. It is also possible that the vibration detection device arranged together with the drive control unit on a circuit board is and this board is in turn provided on the motor housing.

at In a further advantageous embodiment, the vibration detection device is a Vibration Transducers. In addition, it may be in the vibration detection device also a structure-borne sound sensor act. You can also continue provided both a vibration sensor and a structure-borne sound sensor be.

there is the purpose of this sensor, d. H. of the vibration sensor or the structure-borne sound sensor in it, mechanical damage on the engine and in particular on its storage as appropriate also to be able to diagnose on the load machine.

at a further advantageous embodiment, the engine assembly a memory device in which for the movement of the motor unit characateristic values are stored. In this characteristic Values may be, for example, limits for occurring vibrations or the like. These limits can also dependent on from another indicator of the engine, such as its speed or its torque can be derived.

The motor arrangement is preferably a compact servo motor. Such compact servo motors can be tested for excessive or inadmissible vibrations by integrating a vibration detection device and the additional evaluation for motor and machine monitoring. Due to the particularly advantageous arrangement of the vibration detection device in the control electronics, for example, a control or power card that is firmly connected to the stator or the housing of the engine, it is possible that this vibration detection device detects the mechanical vibrations and structure-borne sound waves of the engine at this point. Due to the inventive evaluation of the data of the first or the first signals of the vibration detection device in the drive control device, it is possible that the vibrations occurring are related to other measured variables or state variables of the Drive such as the speed.

The The present invention is further directed to an inverter, or inverter directed to operating a motor assembly, said inverter or inverter can be arranged on a motor unit and a drive control unit which controls the movement the motor unit controls. In this case, this inverter has a permanent on the inverter arranged vibration detection device, which is suitable for mechanical vibrations of the motor unit capture and output a first signal, which for this mechanical vibration is characteristic. Furthermore, this is Vibration detection device designed such that the first Signal can be output to the drive control unit.

Prefers is the vibration detecting device in a housing of the Inverter arranged and the inverter or its housing is direct on a housing the motor unit attached.

The The present invention is further directed to a method of operation directed to a motor assembly, wherein the motor assembly comprises a motor unit, a converter that supplies the motor unit, and a drive control unit, which controls the movements of the motor unit has. According to the invention is a on the motor assembly permanently and preferably also stationary arranged vibration detection device provided which detects mechanical vibrations of the motor unit and outputs a first signal indicative of mechanical vibrations is characteristic. Furthermore, according to the invention, the first Signal output to the drive control unit.

Preferably the engine assembly is designed in the manner described above. Especially Preferably, the evaluation of the first signals and optionally also the other sizes in the frequency range. It can disorders such as imbalance or bearing damage at their typical speed-dependent frequencies be recognized. For example, a reference to a new Machine determined and stored in the control device Target or good condition are used. It can also be a variety for example, speed-dependent Reference values are available.

Further Advantages and embodiments the present invention will become apparent from the accompanying drawings:

In this demonstrate:

1 a highly schematic block diagram of a motor assembly according to the invention; and

2 a schematic representation for illustrating the arrangement of a erfindungemäßen vibration detection device.

1 shows a block diagram of a motor assembly according to the invention 1 , This engine arrangement 1 has a motor unit 2 on, ie that unit, which ultimately the rotational movement of a motor shaft 16 generated.

Directly on the motor unit 2 is an inverter or inverter 4 arranged, which is the motor unit 2 fed with electrical energy. More precisely, the inverter is 4 at the in 1 shown embodiment in a housing 5 arranged and this housing in turn on a housing 14 the motor unit 2 arranged. The reference number 6 refers to a drive control unit such as a drive processor and the reference numeral 10 denotes a vibration detecting device, which mechanical vibrations of the motor unit 2 or the motor housing 14 detected.

The reference number 18 indicates a memory device in which, for example, reference data or reference curves for a desired state can be stored. For example, allowed maximum values for a vibration amplitude of a on the housing of the motor unit 2 occurring vibration as a function of the speed or the torque of the motor unit to be stored.

It is preferably possible, the vibration detection device 10 to arrange on the processor card or the power card of the control electronics and in this way functionally with the drive processor or the drive control unit 6 connect to. Preference is given to the processor and power card or the drive control device 6 so in the case 5 or on the housing 16 the motor unit 2 attached, the mechanical vibrations of this case 14 from the vibration detecting device 6 can be detected. The vibration detection unit 6 is particularly preferably embodied in so-called MEMS technology (micro-electro-mechanical system). A MEMS is a combination of mechanical elements, sensors, actuators and electronic circuits arranged on a substrate or chip. Examples of semiconductor-based MEMS include acceleration sensors.

2 shows a highly schematic representation of an arrangement of vibration detection devices 10 on a motor unit 2 , There at is on the housing 14 the motor unit 2 a first circuit board 7a (The component of which is the drive control unit 6 is) arranged. Via a screw connection 9 is a housing 4 of the inverter with a bottom plate 5a and a lid 5b firmly arranged. This also engine vibrations are directly on the housing 4 of the inverter. At the in 2 shown embodiment are two circuit boards 7a . 7b shown at alternative positions, to the respective vibration detection devices 10 are arranged. Because of the case 4 If the converter is firmly bolted to the motor, the motor vibrations are also applied directly to the vibration detection devices 10 transfer. In the actual implementation, either the printed circuit board is preferred 7a or the circuit board 7b available.

The of the vibration detection device 10 output signals can be processed together with other motor data such as the rotational speed and the torque and in this way be related to the said values. Based on this comparison, it is possible to determine whether predetermined limits for engine vibrations are exceeded as a function of, for example, a certain speed.

If so, the user may have an alarm output device 12 (see. 1 ) are informed about a faulty state of the machine.

All Features disclosed in the application documents are considered to be essential to the invention as long as they are individually or in combination with respect to State of the art are new.

1

engine location

2

motor unit

4

inverter

5

Housing of inverter

5a

Bottom plate of the housing 5

5b

Cover of the housing 5

6

Drive control unit

7a, 7b

PCB

9

screw

10

Vibration detecting means

12

Signal output device

14

motor housing

16

motor shaft

18

memory device

Claims (16)

Motor arrangement ( 1 ) with a motor unit ( 2 ), a converter ( 4 ), which is the engine unit ( 2 ) and with a drive control unit ( 6 ), which detects the movements of the motor unit ( 2 ), characterized in that the engine assembly ( 1 ) permanently on the engine assembly ( 1 ) arranged vibration detection device ( 10 ), which mechanical vibrations of the motor unit ( 2 ) and outputs a first signal which is characteristic of these mechanical oscillations, wherein the vibration detection device ( 10 ) is configured such that the signal to the drive control unit ( 6 ) is output. Motor arrangement ( 1 ) according to claim 1, characterized in that the vibration detection device ( 10 ) into the drive control unit ( 6 ) is integrated. Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the engine arrangement ( 1 ) is configured such that the first signal is related to at least one characteristic of movement of the motor. Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the vibration detection device ( 10 ) in a housing ( 5 ) of the inverter ( 4 ) is arranged. Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the converter ( 4 ) directly with a housing ( 14 ) of the motor unit ( 2 ) connected is. Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the engine arrangement ( 1 ) a signal output device ( 12 ), which outputs an output signal when predetermined first signals occur. Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the converter ( 4 ) on the motor unit ( 2 ) is arranged. Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the converter ( 4 ) in a housing ( 14 ) is arranged. Motor arrangement ( 1 ) according to claim 6, characterized in that the converter ( 4 ) on the motor unit ( 2 ) can be arranged. Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the vibration detection device ( 10 ) a vibration sensor ( 10 ). Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the vibration detection device ( 10 ) a structure-borne sound sensor ( 10 ). Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the engine arrangement ( 1 ) a memory device ( 18 ), in which for the movement of the motor unit ( 2 ) characteristic values are stored. Motor arrangement ( 1 ) according to at least one of the preceding claims, characterized in that the engine arrangement ( 1 ) is a compact servo motor. Inverter ( 4 ), in particular for operating a motor arrangement ( 1 ) according to at least one of the preceding claims, wherein this converter ( 4 ) on a motor unit ( 2 ), and a drive control unit ( 6 ), which detects the movements of the motor unit ( 2 ), characterized in that the inverter ( 4 ) permanently on the inverter ( 4 ) arranged vibration detection device ( 10 ), which is suitable mechanical vibrations of the motor unit ( 2 ) and output a first signal which is characteristic of these mechanical oscillations and wherein the vibration detection device ( 10 ) is configured such that the first signal can be output to the drive control unit. Method for operating a motor arrangement ( 1 ), the engine assembly ( 1 ) a motor unit ( 2 ), an inverter ( 4 ), which is the engine unit ( 2 ) and a drive control unit ( 6 ), which detects the movements of the motor unit ( 2 ), characterized in that one on the engine assembly ( 1 ) permanently arranged vibration detection device ( 10 ) mechanical vibrations of the motor unit ( 2 ) and to the drive control unit ( 6 ) outputs a first signal which is characteristic of these mechanical vibrations. Method according to claim 13, characterized in that that the engine assembly according to at least one of the preceding Claims 1-10 is executed.