Device for continuous oscillation monitoring during rotating field machine operation

Abstract

A rotating field machine, in particular an electric motor with a stator and a rotor, is configured with a motor control for controlling the rotation and the rotational speed n of the rotor of the rotating field machine, wherein the motor control integrally includes an oscillation sensor system in order to acquire actual measurement values of oscillations of the rotating field machine depending on the rotational speed n.

Claims

1. A rotating field machine having a rotor, and configured with a motor control for controlling at least the rotation and the rotational speed n of the rotor of the rotating field machine, wherein the motor control integrally comprises an oscillation sensor system configured to continuously monitor the oscillation behavior of the rotating field machine by acquiring actual measurement values of occurring oscillations of the rotating field machine depending on the rotational speed n during running operation and to directly adapt control parameters of the motor in relation thereto; wherein the motor control is configured for storing, depending on the actual measurement values of the oscillation sensor system at one or multiple determined rotational speeds n.sub.i, said rotational speeds as rotational speeds n.sub.unz which are unacceptable for the motor control, in a system memory of the motor control, such that the motor control does not actuate these rotational speeds n.sub.unz during operation.

2. The rotating field machine according to claim 1, wherein the motor control integrally comprises means for the analysis of the actual measurement values of the oscillations acquired by the oscillation sensor system.

3. The rotating field machine according to claim 2, wherein the means for the analysis of the actual values are configured so that, depending on stored target values and limit values, unacceptable oscillations at the corresponding rotational speeds n are detected and/or processed by the motor control.

4. The rotating field machine according to claim 1, wherein the motor control comprises one or more printed circuit boards, on which an oscillation sensor of the oscillation sensor system is mounted.

5. The rotating field machine according to claim 4, characterized in that the motor control comprises at least one processor coupled by signal technology to the oscillation sensor.

6. The rotating field machine according to claim 1, wherein the motor control comprises at least one processor coupled by signal technology to an oscillation sensor.

7. The rotating field machine according to claim 1, wherein each of the rotational speeds n.sub.unz represents an unacceptable rotational speed range delimited by a lower value and an upper value.

8. The rotating field machine according to claim 1, wherein the rotating field machine is an electric motor of a fan or of a blower.

9. A method for operating a rotating field machine according to claim 1, wherein the motor control is configured to control the rotating field machine with the following operating conditions: i) rotational speed n: 0<n≤n.sub.max ii) n≠n.sub.unz, such that n.sub.unz is not actuated during operation; wherein n.sub.unz represents all the rotational speeds not acceptable for the use according to intended purpose and said rotational speeds are determined during a run-up of the rotating field machine as follows: a) acquisition of the actual measurement values of the oscillation behavior with the oscillation sensor system, starting from a standstill of the rotating field machine, by continuous increasing of the rotational speed n; b) wherein, when an unacceptable actual measurement value is detected at a certain rotational speed n.sub.i, in comparison to the acceptable target measurement values, the motor control stores this rotational speed n.sub.i as unacceptable rotational speed n.sub.unz for the operation according to the intended purpose of the rotating field machine, in a system memory; c) wherein the increasing of the rotational speed n and the measures from step b) are repeated or continued until the maximum acceptable rotational speed nmax has been reached.

10. A method for operating a rotating field machine according to claim 1, wherein the motor control is configured to control the rotating field machine with the following operating conditions: i) rotational speed n: 0<n≤n.sub.max ii) n≠n.sub.unz, such that n.sub.unz is not actuated during operation; wherein n.sub.unz represent all the rotational speeds which are unacceptable for the use according to the intended purpose and these unacceptable rotating speeds are determined during a run-up of the rotating field machine as follows: a) acquisition of the actual measurement values of the oscillation behavior with the oscillation sensor system starting from the maximum rotational speed or an actual rotational speed of the rotating field machine by continuous decreasing of the rotational speed n to a standstill; b) wherein, when an unacceptable actual measurement value is detected at a certain rotational speed n.sub.i, in comparison to the acceptable target measurement values, the motor control stores this rotational speed n.sub.i as unacceptable rotational speed n.sub.unz for the operation according to the intended purpose of the rotating field machine, in a system memory; c) wherein the decrease of the rotational speed n and the measures from step b) are repeated or continued until a standstill has been reached.

11. The rotating field machine according to claim 1, wherein the rotating field machine is an electric motor comprising a stator and the rotor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In order that the disclosure may be well understood, there will now be described various forms thereof, given by way of example, reference being made to the accompanying drawings, in which:

(2) FIG. 1 shows a diagrammatic circuit sketch of the device according to the invention;

(3) FIG. 2 shows a diagrammatic representation of the principle of the continuous oscillation monitoring, and

(4) FIG. 3 shows a flow chart which demonstrates the measurement run.

(5) Below, the invention is explained in further detail in reference to FIG. 1 to FIG. 3 with an embodiment example, wherein identical reference numerals refer to identical structural and/or functional features in the figures. The drawings are provided herewith for purely illustrative purposes and are not intended to limit the scope of the present invention.

DETAILED DESCRIPTION

(6) The following description is merely exemplary in nature and is in no way intended to limit the present disclosure or its application or uses. It should be understood that throughout the description, corresponding reference numerals indicate like or corresponding parts and features.

(7) FIG. 1 is a diagrammatic circuit sketch of the device according to invention, here an electric motor 1. The electric motor 1 has a rotor 2 and a stator 3. Furthermore, the electric motor 1 has a motor control 10 for controlling the rotational speed n of the rotor 2.

(8) The motor control 10 integrally comprises an oscillation sensor system 20 for acquiring actual measurement values of oscillations of the electric motor 1 depending on the rotational speed n.

(9) SP designates the system parameters with which the motor control 10 controls the operation of the motor 1 by means of a processor 11. As system parameters SP, the rotational speed n and the maximum acceptable rotational speed n.sub.max should be mentioned, for example. Furthermore, system parameters SP which were obtained due to the oscillation analysis are stored as operating parameters, such as the elimination ranges of the rotational speed, unacceptable rotational speeds n.sub.unz, unacceptable oscillation.

(10) FIG. 3 shows one measurement run which can be implemented with the idea of the present disclosure.

(11) In the first step, the rotational speed n is increased from a standstill after the start of the motor 1. As long as the rotational speed n is less than the maximum acceptable rotational speed n.sub.max, the rotational speed is increased until an undesirable oscillation status is detected during the reading out of the oscillation sensor 20. If no such measurement event occurs, then the motor 1 is run up to the maximum acceptable rotational speed n.sub.max, and the measurement run ends, since no interfering oscillation statuses occurred.

(12) As soon as, at certain rotational speed n.sub.i, an acceptable (stored) limit value for the oscillation status has been exceeded, this rotational speed n.sub.i is stored as unacceptable rotational speed n.sub.unz, and the loop continues to be run and in the process the rotational speed n is further increased until the maximum acceptable rotational speed n.sub.max has been reached. At the end of the entire measurement run, the rotational speeds n.sub.unz which are “to be eliminated” for the operation have been established.

(13) In FIG. 2, the normal operation of the motor 1 is represented in the context of the continuous monitoring. The oscillation sensor 20 monitors the operation and the data of the oscillation sensor 20 is acquired regularly or continuously by the motor control 10. When a defined limit value is exceeded, a signal is generated, which can be processed in different ways by signal technology. For example, a warning message or a switch-off command for the motor 1 can occur. Alternatively, the motor control 10 can adapt the rotational speed n in accordance with an adaptation command until the limit value has again been undershot by a certain factor.

(14) Within this specification, embodiments have been described in a way which enables a clear and concise specification to be written, but it is intended and will be appreciated that embodiments may be variously combined or separated without parting from the invention. For example, it will be appreciated that all preferred features described herein are applicable to all aspects of the invention described herein.

(15) While the above description constitutes the preferred embodiments of the present invention, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope and fair meaning of the accompanying claims.