Method for performing switching of a switch and drive system for a switch

Abstract

A method for performing a switching of a switch (17) and a drive system (3) for a switch (17) for performing a switching are disclosed. The switch (17) is switched from a current switching position (SJ) to a target switching position (SJ+K). A first value of a first position (PI) of a drive shaft (16) of the drive system (3) is determined with a feedback system (4). Furthermore, a value of a second position (PH) of the drive shaft (16) is determined depending on the target switching position (SJ+K) to which the switch (17) is to be moved. The motor (12) is controlled in correspondence to the difference between the value of the first position (PI) and the value of the second position (PH) until the value of the second position (PH) of the drive shaft (16) is reached and thereby the target switching position (SJ+K).

Description

Technical Field

[0001] The present invention relates to a method for performing switch switching by means of a drive system.

[0002] The present invention also relates to a drive system for a switch, the drive system comprising at least one motor acting on a drive shaft. Background Technology

[0003] For example, German utility model DE202010011521U1 discloses a drive device for an on-load tap changer. This on-load tap changer drive device has a motor rigidly connected to a corresponding on-load tap changer via a connecting rod. The motor is operated by means of wiring, i.e., by manipulating a motor contactor to turn the motor on or off. The on-load tap changer is then operated via a drive shaft. After assembling the switch, only minor modifications are possible to the drive device. Therefore, the drive device becomes rigid and inflexible. Even simple adjustments require complex modifications.

[0004] On-load tap changers are commonly used to regulate voltage in different transformers. A drive system is used to operate the on-load tap changer. Here, a motor located on the transformer casing is connected to the on-load tap changer via a linkage. Power is supplied to the motor by operating an electromechanical contactor. The motor is operated according to the wiring, causing its drive shaft to rotate in one direction or the other. Before switching, the current state or position of the on-load tap changer is not checked. It is always assumed that the on-load tap changer has not changed its position since the last switching. Summary of the Invention

[0005] Therefore, the object of the present invention is to provide a method for switching a switch, wherein the transition from one switching position to the next switching position is always accurately implemented, so as to improve the reliability of switching and make switching safer.

[0006] This task is solved by a method for switching a switch from its current switching position to a target switching position, the method comprising features according to the invention.

[0007] The object of the present invention is also to provide a drive system for a switch to perform a switch from a current switching position to a target switching position, the drive system ensuring an accurate and reliable transition from one switching position to the next switching position.

[0008] This task is solved by a drive system for performing the action of switching the switch from the current switching position to the target switching position, the drive system including the features according to the invention.

[0009] This invention relates to a method for switching a switch from a current switching position to a target switching position by means of a drive system, comprising the following steps:

[0010] - Receive switching signals from the control device via the drive system;

[0011] - Determine at least one value of a first position of the drive shaft of the drive system by means of a feedback signal from the feedback system, wherein the first position is the current position of the drive shaft before the switching;

[0012] - Compare the value of the first position of the drive shaft with the value of the position of the drive shaft at the last target switching position;

[0013] - If the value of the first position of the drive shaft is inconsistent with the value of the drive shaft position of the previous target switching position, the control device acts on the motor according to the feedback signal until the value of the drive shaft position of the previous switching position is reached as the corrected first position.

[0014] - The control device determines the value of the second position of the drive shaft based on the target switching position to which the switch is to go;

[0015] - The control device determines the difference between the corrected first position value of the drive shaft and the second position value of the drive shaft;

[0016] - The control device acts on the motor according to the feedback signal until the drive shaft has passed the determined difference.

[0017] The method according to the present invention for switching a switch from a current switching position to a target switching position by means of a drive system is characterized in that: firstly, the drive system receives a switching signal from a control device. Then, at least one value of a first position of the drive shaft of the drive system is determined by a feedback signal from a feedback system. Similarly, the control device determines a value of a second position of the drive shaft based on the target switching position to which the switch is to go. The control device determines the difference between the value of the first position and the value of the second position of the drive shaft. Finally, the control device acts on the motor according to the feedback signal until the value of the second position of the drive shaft is reached, thus completing the switch from the current switching position to the target switching position.

[0018] The advantage of the method according to the present invention is that the method can reliably perform the switching from the current switching position to the target switching position.

[0019] Similarly, the method according to the present invention can be used to consider the time-varying nature of the drive system used for the switch.

[0020] According to one possible embodiment of the invention, after determining at least one value of the first position of the drive shaft at the current switching position, this value of the first position of the drive shaft can be compared with the value of the position of the drive shaft at the previously reached target switching position. The previously reached target switching position corresponds to the current switching position from which the switch should be initiated. If it is now determined that the value of the first position of the drive shaft at the current switching position is inconsistent with the value of the position of the drive shaft at the previously reached target switching position, the control device acts on the motor according to a feedback signal until the value of the position of the drive shaft at the previously reached switching position is reached.

[0021] Similarly, in another embodiment of this method, it is possible that after determining the value of a first position of the drive shaft, the first position is checked via a feedback signal from a feedback system to see if it is within a predefined tolerance range. This tolerance range may include multiple positions of the drive shaft around the currently switched position.

[0022] Preferably, the switch is switched from the current switching position to the target switching position, such that the switching step has a value of +1 or -1. This means: switch to the next lower or the next higher switching position.

[0023] An encoder system is used to detect the position of the drive shaft; this encoder system is part of the feedback system. The encoder system is directly or indirectly coupled to the drive shaft. The memory of the control device can store the assignment of switch switching positions to drive shaft position values.

[0024] The drive system for performing a switch transition from a current switching position to a target switching position according to the present invention is characterized by: a drive shaft connecting the drive system to the switch; a motor driving the drive shaft; a control device generating a switching signal for the drive system; and a feedback system functionally assigned to the drive shaft and connected to a power component of the drive system, configured to determine a first position of the drive shaft. Based on this position, a feedback signal can be generated. A control unit of the control device connected to the power component is configured to operate the motor according to the switching signal and the feedback signal until the target switching position is reached.

[0025] According to one possible embodiment of the invention, the control unit or control device includes a memory. A power component is used to supply energy to the motor. The memory stores the assignment of switch switching positions and drive shaft positions.

[0026] The feedback system includes an encoder system that is directly or indirectly coupled to the drive shaft. The encoder system can be an absolute encoder, a multi-turn absolute encoder, a single-turn rotary encoder, a virtual rotary encoder, or a virtual rotary encoder with at least one auxiliary contact.

[0027] The improved design is based on the following idea: Before operating the switch, i.e., after receiving the switching signal, the position of the switch and the corresponding movement of the switch since the last switch are checked based on the position of the drive shaft. That is, it checks whether the switch has moved away from its previous destination position between the last and next switch. In this case, it is less assumed that the switch has been switched from one specific state, such as one specific tap position, to another specific state, such as another specific tap position, during this period, but rather whether the mechanical components have moved a few degrees, for example, due to vibration. After determining the value of the first position of the drive shaft, the value of the second position of the drive shaft is determined. The second value is assigned to a specific state of the switch. In the case of an on-load tap changer, the value of the second position of the drive shaft corresponds to a tap position of the on-load tap changer. After determining the difference between these values, i.e., the distance between the current position and the desired destination position, the control device acts on the motor until the drive shaft reaches the second position. Monitoring is performed using a feedback system. Attached Figure Description

[0028] The invention and its advantages will now be explained in more detail by way of embodiments, with reference to the accompanying drawings, but without limiting the invention to the embodiments shown. The dimensions in the drawings do not always correspond to actual dimensions, as some shapes are simplified and others are shown enlarged compared to other elements for better explanation.

[0029] in:

[0030] Figure 1 A schematic diagram of an embodiment of a switch having a drive system according to the present invention is shown;

[0031] Figure 2 A schematic diagram is shown of a switch having various switching positions that can be accessed by a motor;

[0032] Figure 3 A schematic diagram shows the different positions of the drive shaft movement in order to move from one switching position to the next switching position;

[0033] Figure 4 A schematic diagram illustrates a possible implementation of a portion of an encoder system that can be used to detect the position of a drive shaft;

[0034] Figure 5 The following is a flowchart illustrating a method for operating a switch, particularly an on-load tap changer, according to the present invention; and

[0035] Figure 6 Another method flow for operating a switch, particularly an on-load tap changer, according to the present invention is shown.

[0036] The same reference numerals are used for the same or similar elements in this invention. Furthermore, for clarity, only the reference numerals necessary for describing the respective figures are shown in the various figures. Detailed Implementation

[0037] Figure 1 A schematic diagram of an exemplary embodiment of a switch assembly 1 having a switch 17 and a drive system 3 is shown, the drive system being connected to the switch 17 via a drive shaft 16. The drive system 3 enables the implementation of a switching method according to the invention. The switch 17 may be an on-load tap changer, load transfer switch, selector, dual commutator, commutator, preselector, power switch, load switch, or disconnector. The drive system 3 includes a motor 12 that drives the drive shaft 16 via a motor shaft 14 and optionally via a gearbox 15. The control device 2 of the drive system 3 includes a power component 11, which includes, for example, an inverter (not shown) for controlled or regulated energy supply to the motor 12; and a control unit 10 for operating the power component 11, for example via a bus 19. The drive system 3 has a feedback system 4 functionally assigned to the drive shaft 16. The feedback system 4 may be an encoder system 13. The encoder system 13 may also be part of the feedback system 4. The feedback system 4 or the encoder system 13 is connected to the power component 11. In addition, the encoder system 13 is directly or indirectly coupled to the drive shaft 16.

[0038] The encoder system 13 is configured to detect a first value of the position PI of the drive shaft 16, such as angular position, and especially absolute angular position. For this purpose, the encoder system 13 may include, for example, an absolute encoder, especially a multi-turn absolute encoder or a single-turn rotary encoder, fixed to the drive shaft 16, or fixed to a motor shaft 14 or other shaft whose position is uniquely associated with the position P1, P2, ..., PH of the drive shaft 16. For example, the position P1, P2, ..., PH of the drive shaft 16 can be uniquely determined based on the position of the motor shaft 14, such as by the gear ratio of the transmission 15. The encoder system 13 may also include a virtual rotary encoder that determines the position of the motor shaft 14 and thereby derives the position P1, P2, ..., PH of the drive shaft 16.

[0039] Feedback system 4 is configured to detect the position values ​​P1, P2, ..., PH of drive shaft 16. In the case where encoder system 13 is designed as a multi-turn absolute encoder or a single-turn rotary encoder, the position values ​​of drive shaft 16 are provided as records.

[0040] When the encoder system 13 is implemented as a virtual rotary encoder, the values ​​of the positions P1, P2, ..., PH of the drive shaft 16 are determined by the rotor position of the motor 12. For this purpose, inductive feedback caused by the movement of the rotor in the motor windings of the motor 12 can be utilized, for example. Since the strength of this feedback changes periodically, the rotor position can be approximated, especially by means of signal analysis, such as FFT analysis. Since one full revolution of the drive shaft 16 corresponds to multiple revolutions of the rotor, the positions P1, P2, ..., PH of the drive shaft 16 can thus be inferred with much higher accuracy.

[0041] The encoder system 13 can also be configured as a combination of a virtual rotary encoder and auxiliary contacts, which are directly or indirectly connected to the drive shaft 16. The signals from the virtual rotary encoder and the auxiliary contacts then form the values ​​of the positions P1, P2, ..., PH of the drive shaft 16.

[0042] The control device 2, especially the control unit 10 and / or the power component 11, is configured to control or regulate the motor 12 based on the feedback signal generated by the feedback system 4 based on the value.

[0043] Control device 2, such as control unit 10, uses the values ​​of the positions P1, P2, ..., PH of drive shaft 16 to position switch 17. The values ​​of the positions P1, P2, ..., PH of drive shaft 16 can be specified as a range or tolerance. This enables: improving the accuracy of drive system 3 or improving the reliability of switching from the current switching position SJ to the target switching position SJ+K.

[0044] Figure 2 A schematic diagram of a switch 17 with various switching positions S1, S2, ..., SN accessible by the motor 12 is shown. An encoder system 13 is provided on the drive shaft 16. In the embodiment described herein, the encoder system 13 is directly assigned to the drive shaft 16. When the motor 12 is operated via the control device 10 in conjunction with the power unit 11, the switch 17 is switched from switching position S2 to switching position S3, as shown here. Figure 2The diagram illustrates an ideal initial configuration where contact 20 for switching position S2 has position P1 of drive shaft 16. Through manipulation of motor 12, drive shaft 16 passes through position P2 to PH-1 and reaches position PH corresponding to the target switching position S2 at the end of manipulation of motor 12. Contact 20 is electrically connected to switching position S3 after the switching is complete. Therefore, position PH of drive shaft 16 uniquely corresponds to contact 20 with switching position S3. For each switch from one switching position SJ to the next higher switching position SJ+1 or the next lower switching position SJ-1, multiple positions P1, P2, ..., PH are determined for drive shaft 16 using encoder system 13. If these multiple positions P1, P2, ..., PH have been determined by encoder system 13, it is clear that, for example, the switch from switching position SJ to the next higher switching position SJ+1 is uniquely and reliably performed.

[0045] Figure 3 A schematic diagram is shown illustrating the different positions P1, P2, ..., PH that drive shaft 13 needs to be moved to in order to reach the next switching position SJ+1 (target switching position) from a switching position SJ. The initial case shown here is that the position P2 of drive shaft 13 is not at the initial position P1 of switching position SJ. In this case, after drive system 3 receives a switching signal, at least one value of the first position P2 of drive shaft 16 of drive system 3 is determined. This position P2 is determined by feedback signals from feedback system 4 or encoder system 13. A second position PH of drive shaft 16 is also determined, where the value of this position PH corresponds to the desired switching position SJ+1 (target switching position) of switch 17. The switch from switching position SJ to switching position SJ+1 is performed with a switching step size K of 1 in this case.

[0046] Based on this, the difference between the value of the first position P2 of the drive shaft 16 and the value of the second position PH of the drive shaft can be determined by the control device 2. Then, the control device 2 acts on the motor 12 according to the feedback signal until the value of the second position PH of the drive shaft 16 is reached, that is, the switching position SJ+1 (target switching position).

[0047] according to Figure 3The situation shown can be achieved using the second possibility to switch from switching position SJ to switching position SJ+1 (target switching position). The value of the first position P2 of drive shaft 16 in the current switching position SJ is determined. This value of the first position P2 of drive shaft 16 is compared with the value of the position PH of drive shaft 16 in the previous target switching position SJ. If the value of the first position P2 of drive shaft 16 in the current switching position SJ is inconsistent with the value of the position PH of drive shaft 16 in the previous switching position SJ (target switching position SJ+K), which is the case here, then the control device 2 acts on motor 12 according to the feedback signal until it reaches the position PH of drive shaft 16 in the previous switching position SJ. In the case shown here, this means that motor 12 is manipulated in the opposite direction until it reaches position P1 of drive shaft 16 in the current switching position SJ, which corresponds to position PH of drive shaft 16 in the previous switching position SJ, for example, when switching from switching position SJ-1 to switching position SJ (target switching position SJ+K). Then, you can go to positions P1, P2, ..., PH until you reach the switching position SJ+1 (target switching position SJ+K).

[0048] Figure 4 A schematic diagram of a possible implementation of an encoder system 13 for detecting the positions P1, P2, ..., PH of the drive shaft 16 during switching is shown. In the embodiment shown here, the encoder system 13 is an encoder disk 22 fixedly connected to the drive shaft 16. The encoder disk 22 is equipped with sensors 24 capable of detecting multiple identical markings M1, M2, ..., MH arranged circumferentially on the encoder disk 22. These markings M1, M2, ..., MH correspond to the positions P1, P2, ..., PH of the drive shaft 16.

[0049] Figure 5 A method flow for performing switching of a switching assembly having drive system 3 and switch 17 is shown. The method is now described based on switch 17, which is exemplarily configured here as an on-load tap changer. However, switch 17 may also be configured as a load transfer switch, selector, preselector, double commutator, or commutator.

[0050] In the first step 40, a signal 30 for "switching" is first sent to the control device 2. This signal 30 is generated by a voltage regulator, a monitoring system, or by manual input (not shown). That is, the on-load tap changer must be operated, for example, to adjust the voltage of the tap transformer. However, it is also conceivable to adjust the on-load tap changer during maintenance, moving it to different switching positions S1, S2, ..., SN during maintenance.

[0051] Next, in the next step 50, the on-load tap changer is determined in control device 2 to be in which switching position S1, S2, ..., SN. For this purpose, the position values ​​P1, P2, ..., PH of drive shaft 16 are queried via power unit 11. This is achieved through feedback system 4. Depending on the implementation, this value is transmitted to power unit 11 and queried by control device 2 via encoder system 13 using a multi-turn absolute encoder or a single-turn rotary encoder directly mounted on drive shaft 16, or via, for example, a virtual rotary encoder utilizing inductive feedback caused by the movement of the rotor in the motor windings of motor 12.

[0052] In the best case, the value determined by the control device 2 corresponds to the value of the specific switching position S1, S2, ..., SN or tap state assigned to the on-load tap changer.

[0053] In the next step 60, the next desired switching position SJ+1 or tap state is determined, and thus the position PH value of the drive shaft 16 is determined. The specified destination switching position SJ+1 or tap state is predetermined by the switching signal 30.

[0054] In the next step 70, the difference between the current position P1 or state of the drive shaft 16 (ideally the tapped state) and the desired position PH of the drive shaft 16 is calculated. This difference represents the ideal value that the drive shaft 16 must reach by rotating. In other words, this difference is the distance that the drive shaft 16 is to travel, which is predetermined as the target distance.

[0055] The control device 2 acts on the motor 12 according to the feedback signal until it reaches the desired position PH of the drive shaft 16 and thereby reaches the desired state or tap state.

[0056] like Figure 6 As shown, an alternative could be to move contact 20 to position PH after step 50, i.e., after determining the current position P1 of drive shaft 16. This is not always necessary. For example, it may happen that contact 20, and therefore drive shaft 16 connected to that contact, moves away from position P1 corresponding to one of the switching positions S1, S2, ..., SN due to vibration. The value of drive shaft 16 position PH reported by feedback system 4 to power component 11 and thereby to control unit 10 does not match the value of drive shaft 16 position P1 and the last visited switching position SJ (from switching position SJ-1 to switching position SJ). Therefore, in step 55, if necessary, the position PH of drive shaft 16 is corrected so that the last visited tap state SJ and therefore the value of drive shaft 16 position P1 is adopted. Figure 5 As described in the previous step, the process continues in the next step 60. In other words, it is checked whether drive shaft 16 is in the position it should be in after the last switch, and if necessary, drive shaft 16 is moved to position P1, that is, brought back to the "correct" starting point.

[0057] By describing the positioning and corresponding adjustments, the risk of incorrect switching is reduced.

[0058] The control device 2, especially the control unit 10, has a memory 18 in which a value for the position of the drive shaft 16 is assigned for each specific switching position (S1, S2, ..., SN) of the switch 17, especially the tap-on state of the on-load tap changer.

[0059] The travel profile (Fahrprofil) predefines the target value to which drive shaft 16 is to travel. While traveling according to the travel profile, the actual value detected by feedback system 4 may deviate from the target value. Based on the predetermined possible deviation between the actual value and the target value, the action on motor 12 can be interrupted or continued.

[0060] Alternatively, after determining the positions P1, P2, ..., PH of the drive shaft 16, it can be checked whether the determined values ​​are within a so-called tolerance range. This tolerance range can be assigned to specific positions P1, P2, ..., PH or tap positions of the drive shaft 16 and can be variably determined. This tolerance range may include, for example, multiple positions, such as positions P1-P5 surrounding corresponding switching positions S1, S2, ..., SN. The selected tolerance range depends on the entire system. This tolerance range also allows the method of the invention to be performed with less precise components / hardware. If the value is within the tolerance range, the correction shown in step 55 is not required.

[0061] Since a tolerance range can be assigned to each switching position S1, S2, ..., SN or tap state, the second value of the position PH of drive shaft 16, i.e., the desired switching position or tap state, can also be within a tolerance range. This also allows the use of less precise components / hardware.

[0062] Figure Labels

[0063] 1 Switch assembly

[0064] 2 Control equipment

[0065] 3 drive system

[0066] 4 Feedback System

[0067] 10 control units

[0068] 11 power components

[0069] 12 motors

[0070] 13 Encoder System

[0071] 14 motor shafts

[0072] 15-speed transmission

[0073] 16 drive shafts

[0074] 17 switches

[0075] 18 memory

[0076] 19 bus

[0077] 20 contacts

[0078] 22-code disk

[0079] 24 sensors

[0080] 30 signal

[0081] 40 steps

[0082] 50 steps

[0083] 55 steps

[0084] 60 steps

[0085] 70 steps

[0086] K switches step size

[0087] M1, M2, ..., MH markers

[0088] Positions of drive shafts and motor shafts: P1, P2, ..., PI, ..., PH

[0089] S1, S2, ..., SJ, ..., SN switch positions

Claims

1. A method for switching a switch (17) from a current switching position (SJ) to a target switching position (SJ+K) by means of a drive system (3), comprising the following steps: - The drive system (3) receives a switching signal from the control device (2); - Determine at least one value of the first position (PI) of the drive shaft (16) of the drive system (3) by the feedback signal of the feedback system (4), wherein the first position (PI) is the current position of the drive shaft (16) before the switch; - Compare the value of the first position (PI) of the drive shaft (16) with the value of the position of the drive shaft (16) at the last target switching position (SJ); - If the value of the first position (PI) of the drive shaft (16) is inconsistent with the value of the position of the drive shaft (16) at the previous target switching position (SJ), the control device (2) acts on the motor (12) according to the feedback signal until the value of the position of the drive shaft (16) at the previous switching position (SJ) is reached as the corrected first position (PI). - The control device (2) determines the value of the second position (PH) of the drive shaft (16) based on the target switching position (SJ+K) to which the switch (17) is to go; - The difference between the modified first position (PI) value and the second position (PH) value of the drive shaft (16) is determined by the control device (2); - The control device (2) acts on the motor (12) according to the feedback signal until the drive shaft (16) has passed the determined difference.

2. The method according to claim 1, wherein, After determining the value of the first position (PI) of the drive shaft (16), the feedback signal of the feedback system (4) is used to check whether the first position (PI) is within a predetermined tolerance range.

3. The method according to claim 2, wherein, If the first position (PI) of the drive shaft (16) is within the predefined tolerance range, a switch from the current switching position (SJ) to the target switching position (SJ+K) is performed.

4. The method according to any one of claims 1 to 3, wherein, The switch (17) is executed to switch from the current switching position (SJ) to the target switching position (SJ+K), such that it switches to the next lower switching position or the next higher switching position.

5. The method according to any one of claims 1 to 3, wherein, The position (P1, P2, ..., PH) of the drive shaft (16) is detected by an encoder system (13), which is part of the feedback system (4) and is directly or indirectly coupled to the drive shaft (16).

6. The method according to any one of claims 1 to 3, wherein, The memory (18) of the control device (2) stores the allocation of the switching position (S1, S2, ..., SN) of the switch (17) and the position (P1, P2, ..., PH) of the drive shaft (16).

7. A drive system (3) for a switch (17) for performing a switch from a current switching position (SJ) to a target switching position (SJ+K), the drive system comprising: - Drive shaft (16), which connects the drive system (3) to the switch (17); A motor (12) for driving the drive shaft (16); and a control device (2) for generating a switching signal for the drive system (3). - A feedback system (4), functionally assigned to the drive shaft (16) and connected to the power component (11) of the drive system (3), wherein the feedback system (4) is configured to: determine the value of a first position (PI) of the drive shaft (16) of the drive system (3), and generate a feedback signal based on the first position, wherein the first position (PI) is the current position of the drive shaft (16) before switching; and - The control unit (10) of the control device (2), the control unit being connected to the power component (11), is characterized in that the control unit is configured as follows: - Compare the value of the first position (PI) of the drive shaft (16) with the value of the position of the drive shaft (16) at the last target switching position (SJ); - If the value of the first position (PI) of the drive shaft (16) is inconsistent with the value of the position of the drive shaft (16) at the previous target switching position (SJ), then the motor (12) is acted upon according to the feedback signal until the value of the position of the drive shaft (16) at the previous switching position (SJ) is reached as the corrected first position (PI). - Determine the value of the second position (PH) of the drive shaft (16) based on the target switching position (SJ+K) to which the switch (17) is to go; - Determine the difference between the modified first position (PI) value of the drive shaft (16) and the second position (PH) value of the drive shaft; - The motor (12) is operated according to the feedback signal of the feedback system (4) until the drive shaft (16) has passed the determined difference.

8. The drive system (3) according to claim 7, wherein, The control device (2) includes a memory (18); and the power component (11) is used to supply energy to the motor (12); and the memory (18) stores the allocation of the switching position (S1, S2, ..., SN) of the switch (17) and the position (P1, P2, ..., PH) of the drive shaft (16).

9. The drive system (3) according to claim 7 or 8, wherein, The feedback system (4) includes an encoder system (13) which is directly or indirectly coupled to the drive shaft (16).

10. The drive system (3) according to claim 9, wherein, The encoder system (13) is an absolute encoder, a multi-turn absolute encoder, a single-turn rotary encoder, a virtual rotary encoder, or a virtual rotary encoder with at least one auxiliary contact.

11. The drive system (3) according to claim 10, wherein, The encoder system (13) is a single-turn rotary encoder or a virtual rotary encoder with at least one auxiliary contact.

12. The drive system (3) according to claim 7 or 8, wherein, The motor shaft (14) is connected to the drive shaft (16) for the switch (17) via a gearbox (15).

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