Method for obtaining operating parameter data of a motor system with an electric motor and corresponding motor system

Abstract

To provide methods for acquiring operating parameter data of a motor system with an electric motor.SOLUTION: A method comprises: recording states of operating parameters during operation of a motor system, where the operating parameters include a basic parameter and at least one additional parameter; determining a state-change event of the basic parameter based on a recorded state of the basic parameter; recording a state of the additional parameter upon detection of the state-change event of the basic parameter; linking the recorded state of the additional parameter to the detected state-change event; and storing it. A corresponding motor system and a corresponding fan are also specified.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for obtaining operating parameter data for a motor system including an electric motor. The motor system may preferably be provided as a component of the fan.

[0002] The present invention also relates to a motor system for acquiring operating parameter data.

[0003] Finally, the invention relates to a fan equipped with a corresponding motor system.

[0004] Here, the term "motor system" is understood in the broadest sense. The invention is applicable, for example, to an electric motor, an arrangement of several electric motors, a group of electric motors or a system of several electric motors. The motor system may also include a control unit having a processor and a memory. [Background technology]

[0005] In practice, it is always important to estimate or determine the remaining useful life of a motor system and / or electric motor component or assembly. See, for example, US Pat. No. 6,299,333, which relates to determining rotor fatigue in electric motor assemblies.

[0006] Determining the remaining useful life of a component or assembly is particularly important where failure could result in damage, such as in thermal applications. For example, if the cooling system or part of it fails in a server room, it could lead to overheating, operational failure, and even damage to servers and other hardware. Cooling other complex and / or expensive electronic systems is equally important. In such applications, it would be useful to have an early indication of impending failure, with the option to replace potentially failing components before failure occurs. Furthermore, it is particularly important to be able to evaluate and analyze at least the operating parameter data immediately after a malfunction or damage has occurred in order to determine the cause.

[0007] In particular, converters used to operate electric motors, such as electronically commutated (EC) motors, have a limited service life due to several components and assemblies. In most cases, semiconductors (mainly at the end or in optocouplers) and capacitors (mainly electrolytic capacitors in intermediate circuits or in switched-mode power supplies) are at the highest risk of failure. In particular, the temperature and load current have a large influence on the deterioration of a capacitor over time, so the useful life of a capacitor varies widely.

[0008] In practice, electric motors are widely used in fans, ranging from miniature drives and servo motors to high performance drives. Like many mechanically powered devices, electric motors are subject to mechanical wear. In the case of electric motors with slip rings, the slip rings and sliding contacts are particularly affected. However, even electric motors without slip rings can fail due to wear. Among mechanical components, motor shaft bearings are particularly affected.

[0009] The degree of wear depends on the operating conditions of the electric motor. For example, if an electric motor is operated in too hot or too cold temperatures, the bearing grease will not provide optimal lubrication and the bearings will fail prematurely. Vibrations exert forces on bearings, and strong vibrations can shorten the lifespan of bearings. For this reason, it is necessary to know the physical variables that affect the operating parameters of an electric motor. With knowledge of such physical variables, the operation of an electric motor, which is subject to wear, can be understood. If a failure has already occurred, the motor can be replaced with one that matches the operating parameters that are expected to cause the failure.

[0010] It is known in practice to mount sensors on the housing of an electric motor that are able to obtain information about the operating parameters of the electric motor. In this case, temperature and vibration are measured. Furthermore, the operation of the motor can be inferred from various parameters of the electric motor's power supply signal (eg, voltage waveform and current intensity).

[0011] Therefore, it is particularly important to store operational parameter data that may be useful in analyzing and evaluating this collected operational data for optimization and troubleshooting purposes.

[0012] However, continuous data collection requires a huge amount of memory and is typically not feasible with fan hardware. Here, a gateway within the motor system allows recording of operating parameter data to be sent directly to a central evaluation unit. However, this is cumbersome and requires the gateway to be permanently connected to a high-level central computing unit capable of receiving and processing vast amounts of data. Furthermore, it requires the transmission of a huge amount of data, which is inefficient and disadvantageous.

[0013] Therefore, for practical fans, recording the operating parameter data of standard equipment is not a meaningful record. In particular, the operational data cannot be used to optimize operation and / or determine / identify causes of motor system failures with respect to customer use. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] German Patent Application Publication No. 102016122404 Summary of the Invention [Problem to be solved by the invention]

[0015] It is therefore an object of the present invention to provide a method for acquiring operational parameter data of a motor system of the aforementioned type, including an electric motor, (preferably directly within the motor system) so as to improve and / or streamline the acquisition and storage of operational parameter data. Additionally, a corresponding motor system and a corresponding fan are identified. [Means for solving the problem]

[0016] The above mentioned object is achieved according to the invention by means of the features of claim 1. The method is a method for obtaining operational parameter data of a motor system having an electric motor (for a fan), wherein the states of the operational parameters are recorded during operation of the motor system, the operational parameters including a basic parameter and at least one additional parameter, a state change event of the basic parameter is determined based on the detected state of the basic parameter, and when a state change event of the basic parameter is detected, the state of the additional parameter is recorded, and the recorded state of the additional parameter is stored in link with the detected state change event.

[0017] The above object is also achieved by the features set forth in claim 16. In other words, the present invention is also achieved by a motor system for acquiring operating parameter data, the motor system comprising: an electric motor having a stator and a rotor rotatable relative to the stator; and a control unit having a processor and a memory, the control unit being configured to record states of operating parameters during operation of the motor system, the operating parameters including basic parameters and additional parameters, the control unit being further configured to determine a state change event of the basic parameters based on detection of the state of the basic parameters, and when a state change event of the basic parameters is detected, record the states of the additional parameters, and store the recorded states of the additional parameters in the memory linked to the detected state change event.

[0018] The above object is achieved by a fan having the features of claim 17. That is, the fan comprises the motor system according to claim 16.

[0019] It is highly advantageous in the method according to the invention if the motor system operating parameter data required for subsequent analysis and evaluation is reduced to the greatest extent possible during data acquisition. Furthermore, the method according to the present invention allows selective reduction of the amount of stored data based on the evaluation of the current operating point and the decision as to whether to store it. To obtain operating parameter data for the motor system, the state of the operating parameters is recorded during operation. In this case, the operating parameters include basic parameters and additional parameters. According to the present invention, predefinable basic parameter state change events are determined based on the recorded states of the basic parameters. According to the present invention, when a state change event of a predefinable basic parameter is detected, the state of the additional parameter (preferably at the time of detection of the state change event) is recorded. The recorded state of the additional parameters is saved linked to the detected state change event.

[0020] Therefore, the use of the method according to the invention for acquiring operating parameter data of a motor system, the motor system according to the invention, and the fan according to the invention results in improved and / or more efficient acquisition and storage of operating parameter data in the motor system. The present invention is therefore based on the idea of ​​recording the operating points of a motor system (particularly with respect to the components of the motor system) in a memory-efficient manner, so that the recorded operating data can be used for cause-finding analysis in the event of damage, or as a long-term database of operating parameter data for the systematic development and optimization of the motor system and / or its components. In an advantageous manner, a control device or control unit with memory functionality is provided in the motor system or electric motor used.

[0021] A "predefinable state change event" to be determined may be understood as a specific or defined state change event where the state of an operating parameter changes significantly. It is assumed that predefinable state change events (precise or not) are determined prior to the operation of the motor. Furthermore, the motor system may independently create and / or adapt state change events during training and / or operation of the motor system at the customer's site, and predefinable state change events may also be considered to refer to such state change events. Thus, within the scope of embodiments, predefinable state change events may be considered to be not strictly predefined or specified, but rather adaptive during learning of the motor system.

[0022] "Recording" or "capturing" the state of an operating parameter should be understood as recording the state in the broadest sense. In this way, a state can be obtained based on the measurement. The operational parameter states are calculated, for example, based on operational-specific simulations. It is also possible to use a combination of simulated data and actual measured data. Thus, the expression "recorded state" of an operating parameter (basic parameter and / or additional parameter) means that the state is recorded by measurement and / or calculation.

[0023] "Operating parameters of an electric motor of a motor system" may include a variety of information that characterizes the operating conditions of an electric motor or motor system. Such operating parameters may be, for example, operating temperature, bearing temperature, vibration stress, electric motor orientation, rotational speed, or humidity. The above list is not definitive but is indicative of possible operating parameters for an electric motor. In principle, anything that directly or indirectly affects the service life of an electric motor or motor system can become such an operating parameter. The physical variables recorded by the sensors that represent each operating parameter also vary depending on the operating parameter. Thus, an operating parameter or record of a state thereof can be determined based on one or more (preferably physical) measured variables. Furthermore, the recording of such operating parameters or conditions may be based on acquired data that has undergone internal processing, simulation, and / or recorded data that has undergone calculations in some cases.

[0024] In order to store the acquired operating parameter data in the motor system, the motor system electronics preferably includes a memory designed to store the recorded state of the operating parameters. To avoid data loss in the event of a power failure, the memory is preferably designed as a non-volatile memory. Such non-volatile memory may be, for example, flash memory, EEPROM (electronically erasable programmable read-only memory), NVRAM (non-volatile random access memory), or another semiconductor memory.

[0025] Predefinable classifications can be used as the basis for recording the state of an operating parameter, and the recorded state of the operating parameter is assigned to a class of the predefined classification. Thus, the status of the operating parameters can be monitored and appropriate actions can be taken to enable efficient recording and storage. The classes may correspond, for example, to predefined ranges of operating parameters. Therefore, within the defined operating parameter range, divisions into operating parameter ranges can be called classes. For processing state change events, the classes into which the operational parameters are classified according to the measured values ​​can be of equal size, so that the classifications are defined at equal intervals. Furthermore, it is possible that the classification may be defined non-linearly by the operating parameters.

[0026] In this regard, it should be noted that the predefinable classifications (i.e., the classes defined by the classifications) can be defined prior to motor operation, thereby providing predefined classifications. Furthermore, the classification (and thus the classes specified by the classification) is developed and / or adapted to the operating parameters during operation of the motor system and / or during the motor system's learning phase, possibly independently.

[0027] Additionally, when a state change event of a basic parameter is detected, the state of one or more further additional parameters at the time of the detection of the state change event can be recorded, linked to the state change event whose state was detected. As a result, additional operating parameter data can be efficiently stored in association with each detected state change event.

[0028] In an embodiment, the detected state change event of the base parameter and the recorded state of the additional parameter may be saved as a state combination. When multiple additional parameters are considered, the recorded states of the multiple additional parameters and the detected state change events are saved as a state combination. This means that the detected state change event, the recorded state of the additional parameter, and possibly the recorded state of yet another additional parameter can be saved as a state combination. As a result, it is possible to acquire operational parameter data with high memory efficiency, and to link and study multiple operational parameters. When two or more operating parameters are considered, the state of at least one further operating parameter is detected and stored as an additional parameter during operation of the motor system, and the operating state of the operating parameter is determined and stored as a function of the change in state of the first operating parameter as a basic parameter. Thus, data acquisition and storage of operational data in a motor system can be performed in an elegant manner. That is, a particular amount of data can be selected and intelligently compressed.

[0029] Thus, combinations of states can be stored as a function of state changes in the basic parameters. As a result, the operating state of the motor system is recorded in the form of a combination of states as a result of detecting a state change event, thereby providing an efficient method. Furthermore, a method for storing a combination of states is initiated or executed as a function of the characteristic state change of the detected basic parameter.

[0030] With regard to efficient storage of recorded or calculated operating parameter data, detected state change events are stored in combinations of states such that the start state and transition state of a detected state change event in a basic parameter are stored in the combination of states. Therefore, the state before the characteristic state change and the state after the characteristic state change are saved as the start state and transition state of the state change event of the basic parameters.

[0031] The state combinations generated based on state change events detected during operation can be stored as or using matrices. A matrix is ​​made up of matrix elements that are addressable via the columns and rows of the matrix. Additionally, matrices can be implemented as multidimensional or populated matrices, with further sub-elements stored in the matrix elements. The sub-elements may include scalars, vectors, and / or matrices.

[0032] Furthermore, the state combinations are stored in a matrix so that the distribution of detected state change events on the basic parameters can be obtained. Therefore, each state change of the basic parameter state change event can be used for subsequent operational data analysis.

[0033] For efficient storage of recorded or determined operating states, the state combinations can be stored in a matrix such that the starting state and transition states of a state change event are mapped via the matrix indices (preferably via the row and column indices of the matrix). Information about the number of state events can be conveniently stored in the matrix elements of the matrix. Therefore, the recorded operating state can be saved simply and efficiently.

[0034] In an advantageous manner, information about the recorded state of the additional parameter can be stored in the matrix elements of the matrix. The matrix may be an inputtable matrix having matrix elements, which may include vectors and / or one or more matrices. Thus, various information regarding the additional parameters (particularly the recorded states of the additional parameters) can be stored in an inputtable matrix in an efficient manner.

[0035] With proper collection of operating parameter data, the state of the basic parameter as determined by the basic parameter state record can be evaluated / analyzed at predefinable or predefined evaluation intervals to detect a basic parameter state change event. Thus, state change events are detected efficiently. A state change event can represent a predefined state change of a basic parameter.

[0036] The evaluation can advantageously be carried out such that, when a predefinable change threshold (in particular a state change threshold) is exceeded, it is determined that a state change event of the basic parameter has occurred. Thus, by selecting an appropriate change threshold, it is possible to determine which state changes should be considered as characteristic state changes with respect to the acquisition and storage of operating parameter data.

[0037] The operating parameters may include a rotational speed parameter, a temperature parameter, a current parameter, and / or a voltage parameter, among others. Operating parameters of the motor system and / or electric motor may be reviewed and stored as they are particularly important for subsequent analysis and optimization of the motor system. Thus, the operating parameters may include information regarding rotational speed, temperature, current, voltage, and the like. Additionally, gradients and other mathematical derivatives derived therefrom are also contemplated.

[0038] For the acquisition and storage of meaningful operating parameter data, the rotational speed parameter is used as the fundamental parameter. Temperature and / or current parameters can be taken into account and recorded in an appropriate manner as additional parameters. Storing the operation parameter data as a function of the rotational speed parameter as a basic parameter has the following advantages, for example: Detailed information on changes in the operating mode of the motor system is obtained. This allows for systematic analysis of operating parameters at the customer site. Data analysis is possible to determine correlations between operating modes and damage patterns. Cold starts can be taken into account when estimating service life.

[0039] Furthermore, for the acquisition and storage of operating parameter data, the voltage parameter is used as the basic parameter.

[0040] There are various options for improving the present invention. For this purpose, reference is made to the claims dependent on claim 1 and to the description of the embodiments which refer to the drawings. In connection with the description of certain embodiments of the invention with reference to the drawings, generally preferred improvements are also described. [Brief explanation of the drawings]

[0041] [Figure 1] 1 is a schematic block diagram of a method for obtaining operating parameter data of a motor system, in accordance with an embodiment of the present invention; [Figure 2] 4 is a schematic diagram of an algorithm for detecting a state change event for a method of acquiring operating parameter data of a motor system in accordance with an embodiment of the present invention; [Figure 3a] 10A and 10B are diagrams for explaining the state of an operating parameter as determined over time. [Figure 3b] 10A-10C are diagrams for illustrating the state of additional operating parameters as determined over time. [Figure 4] 1 is a schematic diagram of storing determined states of operating parameters as combinations of states in a populatable matrix according to an embodiment of the present invention; [Figure 5] 1 is a schematic diagram of method steps according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0042] FIG. 1 shows a schematic block diagram of a method for acquiring operating parameter data of a motor system according to an embodiment of the present invention. FIG. 1 illustrates the principle of a method according to an embodiment applicable to an outer rotor motor and / or fan of a motor system. During operation of the motor system and / or fan, i.e., during operation of the motor, a state change event of the predefined operating parameter 1 is determined based on the state record of the operating parameter 1 as the basic parameter. This means that during operation of the motor, the state of the operating parameter 1 is recorded over time, the state of the operating parameter 1 is evaluated at predefinable evaluation intervals Δt, and predefined and / or characteristic state changes of the operating parameter 1 are detected. If no characteristic change in the state of the operating parameter 1 is observed during the evaluation process, the motor operation continues as is. When a characteristic state change is detected, a memory function is initiated. Thus, during operation of the fan motor system, characteristic state changes are detected through the operating parameters and a memory function is initiated as needed. The save function is then configured so that the state change of operational parameter 1 is saved as a combination along with the state of operational parameter 2 (possibly of a further operational parameter). Corresponding memories are available in the motor system and / or the fan. The motor continues to operate. As a result, a combination of related states, representing the state of the operating parameter, can be detected and stored as a function of the change in state of the base parameter (in this case, Operating Parameter 1).

[0043] FIG. 2 shows a schematic diagram of an algorithm for detecting state change events for a method of acquiring operating parameter data of a motor system according to an embodiment of the present invention. FIG. 2 shows, by way of example, the algorithm underlying the above method, which can be used to detect characteristic state changes of basic parameters. During motor operation, basic parameters of the motor system are sampled at predefined evaluation intervals. The sampled state n(t) of the basic parameters at sampling time t is continuously compared with the state n(t-1) of the basic parameters at the previous sampling time t-1, and state change events are detected based on characteristic state changes. When a state change is detected, a method for storing the detected state change event is initiated, storing the characteristic state change detected and at least one additional parameter (of the state at the time of detection).

[0044] Thus, the changes in the operating parameters, which serve as base parameters, are analyzed during operation at defined evaluation intervals. An operating state of the motor system associated with a state change event is characterized by the amount of change in the basic parameter (ie, the state change of the basic parameter) and the state of at least one additional parameter at the time of the state change event.

[0045] 3a and 3b show diagrams to explain the state of an operating parameter as determined over time. The x-axis of Figure 3a and / or Figure 3b represents the reference variable (eg, time relative to the state of Operating Parameter 1 and Operating Parameter 2). Instead of time, variables such as current, power, temperature, and / or combinations of these variables can also be used as reference variables. The y-axis of Figure 3a and / or Figure 3b represents the possible states of operating parameter 1 and / or operating parameter 2, and the range of values ​​of operating parameter 1 and operating parameter 2 is divided into classes 1 to 10.

[0046] The operating parameter 1 serves as a fundamental parameter, and the curve of the fundamental parameter shown in FIG. 3a represents an exemplary curve of the rotational speed parameter. At the evaluation interval Δt shown by the dashed line in Figure 3a, a state change event can be seen, where the rotation speed jumps from class 4 to class 2.

[0047] The operating parameter 2 serves as an additional parameter, and the curve of the additional parameter shown in FIG. 3b represents an exemplary curve of the temperature parameter. The detection times of the state change events of the basic parameters are shown by the vertical dashed lines in Fig. 3b. Therefore, the state of the additional parameter upon detection of a state change event is assigned class 5 in Figure 3b. Thus, FIG. 3 shows a rotational speed jump occurring at evaluation interval Δt as a state change event, ie, the rotational speed parameter jumping from state class 4 to state class 2. Upon occurrence of a state change event, the temperature parameter serving as an additional parameter is recorded as being in state class 5.

[0048] FIG. 4 illustrates, in a schematic diagram, an example of storing determined states of operating parameters as combinations of states in a populatable matrix, according to an embodiment of the present invention. FIG. 4 illustrates the storage of operating parameter data using the exemplary curves for Operating Parameter 1 and Operating Parameter 2 according to FIG. 3, where the data is stored by storing the recorded operating states in the form of classes defined in a populated matrix. A class is a division of an operational parameter into defined ranges of operational parameter values. The operating parameter categories can be defined as equal intervals or non-linearly. After the state change of the operational parameter 1, the detected state change event is saved in the main matrix so that the start class and transition class (i.e., the states before and after the state change of the operational parameter 1 as the basic parameter) can be verified. The number of entries in the matrix elements represents the number of state change events characterized by the classification of the operational parameter 1 as a basic parameter.

[0049] In addition to the saved state change of a state change event (from class to class) (i.e., the state change of operational parameter 1 as the basic parameter), information about further operational parameters (i.e., additional parameters) is also saved in the implementation program code. This program code is linked to the state change events of the basic parameters. Therefore, for example, it is possible to store as operational parameter data that a jump in rotational speed from class 4 to class 2 occurred in the basic parameter (operational parameter 1), and that a temperature of class 5 existed in the additional parameter (operational parameter 2) when the jump in rotational speed occurred.

[0050] FIG. 5 shows in an overview the individual steps of a method according to an embodiment of the invention. Motor system operating parameter data is acquired and the states of operating parameter 1 and operating parameter 2 are recorded during operation of the motor system. Operational parameter 1 represents the basic parameter, and operational parameter 2 represents the additional parameter. Based on the state record of the operational parameter 1, which serves as a basic parameter, a predefined state change event of the operational parameter 1 is determined. When a state change event of the operation parameter 1 is detected, the state of the operation parameter 2 (the state at the time of the detection of the state change event) which functions as an additional parameter is recorded. The recorded states of the operational parameters 2 are linked to the detected state change events and stored in a populatable matrix.

[0051] The detected state change events and the recorded states of the additional parameters are stored as state combinations in a matrix. The state combinations are stored in a matrix such that the starting state and transition state of the detected state change event are represented by the columns and rows of the matrix. Information about the number of detected state events is stored in the matrix elements of the main matrix. Additionally, information regarding the recorded state of the additional parameter (ie, operational parameter 2) is stored in the matrix elements. According to Figure 5, the characteristic state change from starting class 4 to transition class 2 of operating parameter 1 is stored in the main matrix. The state of the additional parameter at the time of detection of the state change event (i.e., class 5 of operational parameter 2 acting as the additional parameter) is also stored in the corresponding matrix element.

[0052] To reduce the amount of stored data, a choice is made to determine whether to evaluate or store the current operating point. By doing so, the operation parameter data can be acquired with good memory efficiency.

[0053] For further advantageous embodiments of the method according to the invention, reference is made to the general part of the description and to the appended claims.

[0054] Finally, the embodiments of the method according to the invention and the motor system according to the invention as well as the fan according to the invention are used only to illustrate the claimed teachings and do not limit the claimed teachings to the embodiments.

Claims

1. 1. A method for obtaining operating parameter data for a motor system including an electric motor, comprising: the status of the operating parameters of the motor system is recorded during operation of the motor system; the operating parameters include a basic parameter and at least one additional parameter; When a state change event of the basic parameter is detected, the state of the additional parameter is recorded; A method wherein the recorded state of the additional parameter is stored including information indicative of an amount of change in the basic parameter associated with the detected state change event.

2. 2. The method of claim 1, wherein the recorded states of the operating parameters are assigned to classes divided by ranges of measurements of the operating parameters.

3. Upon detecting the state change event of the basic parameter, the state of one or more additional parameters is recorded; 3. A method according to claim 1 or claim 2, wherein the recorded states of the further additional parameters are stored linked to the detected state change event.

4. The method of claim 1 , wherein the detected state change event and the recorded state of the additional parameter are saved as a state combination.

5. 5. The method of claim 4, wherein the state combinations are stored as a function of the state changes in the underlying parameters.

6. 6. The method of claim 4, wherein the detected state change event in the basic parameter is stored using the combination of states such that a start state and a transition state of the detected state change event are stored in the combination of states.

7. 7. A method as claimed in any one of claims 4 to 6, wherein a combination of states produced as a result of a detected state change event comprises a matrix element.

8. The method of claim 7 , wherein the state combinations are stored in the matrix so as to obtain a distribution of the detected state change events over the basic parameters.

9. the state combinations are stored in the matrix such that the starting state and transition state of the state change event are represented via an index of the matrix; 9. A method according to claim 7 or claim 8, wherein information about the number of state events can be stored in the matrix elements of the matrix.

10. 10. A method according to any one of claims 7 to 9, wherein information about the recorded state of an additional parameter is stored in the matrix elements of the matrix.

11. 11. The method according to claim 1, wherein the state of the basic parameter determined by recording the state of the basic parameter is evaluated at predefinable evaluation intervals to detect a state change event of the basic parameter.

12. The method of claim 11 , wherein the evaluation is performed such that a state change event of the underlying parameter is determined to have occurred if a predefinable change threshold is exceeded.

13. The method of any one of claims 1 to 12, wherein the operating parameters include at least one of a rotational speed parameter, a temperature parameter, a current parameter, and a voltage parameter.

14. 14. A method according to any one of the preceding claims, wherein a rotational speed parameter is used as the basic parameter.

15. 15. The method according to any one of claims 1 to 14, wherein a voltage parameter is used as the basic parameter.

16. 16. A motor system for carrying out the method of any one of claims 1 to 15 for obtaining operating parameter data, comprising: the motor system comprising: an electric motor having a stator and a rotor rotatable relative to the stator; and a control unit having a processor and a memory; the control unit is configured to record the status of an operating parameter during operation of the motor system; the operating parameters include a basic parameter and at least one additional parameter; The control unit is further configured to determine a state change event of the basic parameter based on the record of the state of the basic parameter, to record the state of the additional parameter when a state change event of the basic parameter is detected, and to store the recorded state of the additional parameter in the memory including information indicating an amount of change in the basic parameter associated with the detected state change event.

17. A fan comprising a motor system according to claim 16 for carrying out a method according to any one of claims 1 to 15.

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