SE1550334A1 - A drive unit for controlling a control valve element, a method for operating a drive unit of a control valve element anda control valve unit - Google Patents

A drive unit for controlling a control valve element, a method for operating a drive unit of a control valve element anda control valve unit

Info

Publication number
SE1550334A1
SE1550334A1 SE1550334A SE1550334A SE1550334A1 SE 1550334 A1 SE1550334 A1 SE 1550334A1 SE 1550334 A SE1550334 A SE 1550334A SE 1550334 A SE1550334 A SE 1550334A SE 1550334 A1 SE1550334 A1 SE 1550334A1
Authority
SE
Sweden
Prior art keywords
drive shaft
unit
control valve
valve element
drive
Prior art date
Application number
SE1550334A
Other languages
Swedish (sv)
Other versions
SE538429C2 (en
Inventor
Sven-Erik Tegelmark
Original Assignee
Ebr Konsult I Rockhammar Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebr Konsult I Rockhammar Ab filed Critical Ebr Konsult I Rockhammar Ab
Priority to SE1550334A priority Critical patent/SE1550334A1/en
Priority to PCT/EP2016/054026 priority patent/WO2016150644A1/en
Publication of SE538429C2 publication Critical patent/SE538429C2/en
Publication of SE1550334A1 publication Critical patent/SE1550334A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F16K31/042—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves with electric means, e.g. for controlling the motor or a clutch between the valve and the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/003—Measuring of motor parts
    • G01B5/0032—Valves, actuating devices for valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

Abstract A drive unit (3) and a method for controlling a control valve element (5). The drive unit comprises an electric motor (10) comprising a drive shaft (16) adapted to be connected to a control shaft (7) of the control valve element and rotated between a first and a second position. The drive unit comprises a gear box (12) and a control unit (14) adapted to rotate the drive shaft to positions between the first and the second position. The electric motor, the gear box and the control unit are combined in a single mechatronic unit (15). The electric motor is of a type configured to allow rotation of the drive shaft a number of revolutions. The drive unit comprises a detector (32) adapted, at startup of the drive unit, to detect a position of the drive shaft relating to the first or second po- sition of the drive shaft. The control unit is adapted to determine the first and second position of the drive shaft based on the detected position.

Description

A drive unit for controlling a control valve element, a method for operating a drive unit of a control valve element and a control valve unit Field of the invention The present invention relates to a drive unit for controlling a control valve element. The drive unit comprises an electric motor comprising a drive shaft adapted to be connected to a control shaft of the control valve element and rotated between a first position relating to a closed state of the control valve element and a second position relating to an open state of the control valve element.
The drive unit further comprises a gear box adapted to control the output momentum of the drive shaft and a control unit adapted to receive a control signal and to control the electric motor so that the drive shaft is rotated to positions between a first position corresponding to a closed state of the control valve element, and a second position corresponding to an open state of the control valve element, in dependency of the control signal.
The present invention further relates to a method for operating a drive unit of a control valve element and a control valve unit comprising the drive unit and the control valve element.
Prior art Various types of control valve elements are used in industrial manufacturing processes for controlling the flow of a medium to the process. The control valve element is used for regulating the flow of the medium, such as gas, oil, and etcetera, to the industrial process. The medium may be in a liquid phase, a gas phase or mixture of various phases, such as slurry of liquid and solid phase me- dium. The control valve element is for example a ball valve, a butterfly valve, and etcetera. The combination of the drive unit and the control valve element forms a control valve unit.
Prior art drive units for controlling control valve elements are usually either manually operated or pneumatic driven. Electric driven drive units are not commonly available on the marked due to the challenging environment which the drive units are subjected to, which can result in problems with malfunctions of the control of the control valve elements. A further problem with prior art electric driven drive units is that they are customized with electric motor, gear box and control unit for the connected control valve element. Accordingly, the cost of such customized control solution is high and the operation and the control of the drive unit are complex.
US2007170385 discloses an electrically driven actuator for controlling a gaseous or liquid volumetric flow.
Ob'ects and summary of the invention 2 The object of the present invention is to provide a reliable electric driven drive unit for the control of a control valve element. A further object of the invention is to enable the drive unit to be manufactured in a cost effective manner compared with prior art electric driven drive unit using mass produced component.
This object is obtained by means of a drive unit according to the preamble of claim 1. The drive unit is characterized in that the electric motor is of a type configured to allow rotation of the drive shaft a number of revolutions, the electric motor, the gear box and the control unit are combined in a single mechatronic unit, the drive unit further comprises a detector adapted to detect, at startup of the drive unit, at least one position of the drive shaft corresponding to any of the first and second position of the drive shaft, and the control unit is adapted to determine the first and second position of the drive shaft based on the at least one detected position.
The combination of the drive unit and the control valve element forms a control valve unit. The drive unit is provided with a detector for detecting at least one of the first position and the second position relating to the open state respective closed state of the control valve element. The detected position is used for determining the first and second position of the drive shaft. The determining positions are used when controlling the control valve element. Accordingly, the drive unit is arranged to be calibrated for the operation of the control valve element to which the drive unit is applied.
The drive unit is based on a single mechatronic unit that comprises the electric motor, the gear box and the control unit. The single mechatronic unit is an available standard product. The electric mo- tor of the single mechatronic unit is a type configured to allow the drive shaft to rotate a number of revolutions. The single mechatronic unit is for example used in industrial transportation applications. When the single mechatronic unit is configured for the control of the control valve element, rotation of less than a single revolution may be applied, such as a rotation of 70 degrees between the first and the second position of the drive shaft. By means of enabling use of the single mecha- tronic unit, the cost of manufacturing and installing the drive unit is reduced compared with prior art customized control solution.
According to an embodiment of the invention, the control unit is adapted to receive information on the angular rotation between the first position and the second position of the drive shaft, and determine the first and second position of the drive shaft based on the at least one detected posi- tion and the angular rotation between the first position and the second position.
The drive unit is adapted to receive information on the connected control valve element, such as defining the rotational angle between the first position and the second position of the control 3 valve element. The information may for example be the number of pulses of a rotary encoder when the drive shaft is rotated between the first position and the second position. The detected position and the information on the angular rotation between the first and the second position are used for determining the first and second position of the drive shaft.
According to an embodiment of the invention, the drive unit comprises a rotary encoder arranged to indicate a plurality of angular positions between the first position and the second position of the drive shaft, wherein the control unit is adapted, at startup of the of the drive unit, to rotate the drive shaft until detecting at least one of the first position and the second position, and determine and store the angular position of the rotary encoder at the first position and the second position of the drive shaft.
The angular positions between the first position and the second position of the drive shaft are defined for the rotary encoder. At start-up of the drive unit, the angular position of the rotary en- coder is determined and stored at the first position and the second position of the drive shaft.
According to an embodiment of the invention, the detector comprises a position sensor that is adapted to indicate when the drive shaft is in at least one of the first position and the second position. Preferably, the position sensor comprises a marker arranged on the drive shaft and a sensing element adapted to sense the marker. The marker is arranged on the appropriate position corre- sponding to the at least one of the first position and the second position of the drive shaft.
According to an embodiment of the invention, the position sensor is a proximity sensor that indicates when the drive shaft is in at least one of the first position and the second position without physical contact with the drive shaft. For example, the proximity sensor comprises a passive marker arranged on the appropriate position on the drive shaft and the sensing element is arranged to be aligned when the drive shaft is in the at least one of the first position and the second position.
According to an embodiment of the invention, the proximity sensor is one of a capacitive sensor, a Doppler effect, an eddy-current sensor, an inductive sensor, a laser sensor, a magnetic sensor, an inductive sensor, an optical sensor, a thermal infrared sensor, a photocell, an ultrasonic sensor, an Hall effect sensor.
According to an embodiment of the invention, the drive shaft comprises a mechanical stop ar- ranged at at least one of the first position and the second position of the drive shaft, and the detector comprises a sensor adapted to measure the momentum of the drive shaft, wherein the control unit is adapted to determine that the drive shaft is in the at least one of the first position and the second position in dependency of a significant change in said measured momentum. 4 The drive shaft is adapted to be rotated towards the mechanical stop in order to detect the significant change in the momentum of the drive shaft. Thereby, the position of the at least one of the first position and the second position is defined. The significant change is for example a certain threshold value of the momentum of the drive shaft According to an embodiment of the invention, the significant change in said detected momentum constitutes a threshold of the momentum in the interval of 10 to 30% of the operational momentum of the drive shaft, preferably a threshold of the momentum in the interval of 15 to 25% of the operational momentum of the drive shaft.
According to an embodiment of the invention, the information on the connected control valve element, such as defining the rotational angle between the first position and the second position of the control valve element is set by means of one or more DIP-switches.
According to an embodiment of the invention, the mechatronic unit is encapsulated from the surrounding environment. By encapsulating the mechatronic unit comprising the electric motor, the gear box and the control unit, the drive unit is arranged for operation in demanding environments.
According to an embodiment of the invention, the drive unit comprises a connection element for connecting the drive shaft to the control shaft of the control valve element. The connection element enables the drive shaft to be connected to the control shaft of the control valve element.
The object of the invention is further obtained by a method for operating a drive unit of a control valve element according to claim 11. The method comprises the steps of receiving information on the angular rotation between the first position and the second position of the drive shaft, rotating the drive shaft while using the detector for detecting the position of at least one of the first position and the second position of the drive shaft, - bringing the drive shaft to a stand still when detecting the position of the at least one of the first position and the second position of the drive shaft, and storing the rotational position of the drive shaft in the first position as a first rotational value and the rotational position of the drive shaft in the second position as a second rotational value.
The information on the angular rotation between the first position and the second position is de- pendent on the configuration of the control valve element. The angular rotation may for example be 70 degrees or 90 degrees between the first position and the second position. The method further comprises calibrating the drive unit for the connected control valve element. The drive unit is calibrated by means of rotating the drive shaft and searching for a detection of at least one of the first position and the second position of the drive shaft. When one of the first position and the second position has been detected, the drive shaft can be brought to a at a position of the drive shaft that corresponds to position indicated by the received control signal and the rotational position of the drive shaft in the first position is stored as a first rotational value and the rotational position of the drive shaft in the second position is stored as a second rotational value. Thereby, the drive unit is calibrated for use with the connected control valve element.
According to an embodiment of the invention, the detector comprises a position sensor that indicates when the drive shaft is in at least one of the first position and the second position, wherein the position of at least one of the first position and the second position of the drive shaft is de- tected when receiving a indication from the position sensor.
According to an embodiment of the invention, the drive shaft comprises a mechanical stop arranged at at least one of the first position and the second position of the drive shaft, and the de- tector comprises a sensor adapted to measure the momentum of the drive shaft, wherein the po- sition of at least one of the first position and the second position of the drive shaft is detected by detecting a significant change in said measured momentum.
According to an embodiment of the invention, the significant change in the measured momentum of the drive shaft constitutes a threshold of the momentum in the interval of 10 to 30% of the op- erational momentum of the drive shaft, preferably a threshold of the momentum in the interval of 15 to 25% of the operational momentum of the drive shaft.
According to an embodiment of the invention, the method further comprises: - receiving a control signal for the control of the control valve element, determining a position of the drive shaft that corresponds to the control signal, and rotating to the drive shaft to the determined a position.
The control signal is an external received signal. In the case of an industrial manufacturing process or an industrial facility, the control signal is received from a control central. The control central is for example a Distributed Control System (DCS-system), a single loop regulator, a transmitter for level or temperature, and etcetera. The control signal is for example an analog or a digital electric signal. The control signal comprises information on the position in which the control valve element is to be arranged in. The control signal is for example an analog or digital electric signal. In the case of a digital electric signal, the control signal is for example HART, Can, Profibus, etcetera. The con- trol signal may be receive by a wired or wireless connection. In the case of an analog signal, the signal may for example be an electric signal in the interval of 4-20 mA, where 4 mA represents the closed position of the control valve element, 20 mA represents the open position of the control valve element, or vice versa. The values in between 4 and 20 mA represent positions between the 6 closed position and the open position of the control valve element. After that the control signal has been received, the control unit determines a position of the drive shafts that corresponds to the information of the control signal. Once the position of the drive shafts has been determined, the drive shaft is rotated to the determined position.
The object of the invention is further obtained by a control valve unit that comprising the drive unit according to any of claims 1-10 and a control valve element.
Brief description of the drawings The invention will now be explained more closely by the description of different embodiments of the invention and with reference to the appended figures.
Fig. 1shows a control valve element unit comprising a drive unit according to an embodiment of the invention and a thereto connected control valve element.
Fig. 2shows a flow chart of a method for controlling the drive unit in fig. 1 according to an em- bodiment of the invention Detailed description of preferred embodiments of the invention Fig. 1 shows a control valve unit 1 comprising a drive unit 3 according to an embodiment of the invention and a control valve element 5.
The drive unit 3 is arranged to control the operation of the control valve element 5 between an open state and a closed state. The control valve element 5 is adapted to regulate a flow of a medium through the control valve element 5. The control valve element 5 comprises a control shaft 7 for regulating the control valve element 5 to positions between the open state and the closed state.
The medium may be in various phases, such as in liquid phase, gas phase or a mixture of phases, such as a slurry of liquid and solid phases, or a mixture of liquid and gas. For example, the control valve element 5 may be used for regulating the flow of oil, gas, paper pulp, etcetera.
The drive unit 3 comprises an electric motor 10, a gear box 12 and a control unit 14 for controlling the electric motor 10 and the gear box 12. The electric motor 10, the gear box 12 and the control unit 14 are combined in a single mechatronic unit 15 arranged for industrial transportation applications. The single mechatronic unit 15 is encapsulated from the surrounding environment. Thereby, the drive unit 3 is suitable to operate in challenging environment of the control valve element 7 and may be rinsed with water. The single mechatronic unit 15 is for example encapsulated with an IP65 class encapsulation.
The electric motor 10 comprises a drive shaft 16 that is connected to the control shaft 7 by means of a connection element 18. The drive shaft 16 is adapted to be rotated between a first position relating to the closed state of the control valve element 5 and a second position relating to the open state of the control valve element 5.
The control unit 14 is adapted to receive a control signal 20 relating to the control of the control valve element 5. The control signal 20 is for example transmitted from a control center of an indus- trial manufacturing plant in which the control valve element unit 1 is arranged. The control signal 20 comprises information on the desired position of the control valve element 5, such as the closed or open position, or certain positions in between the closed and the open position.
The control signal 20 is for example an analog electric signal, such as 4-20mA, where 4 mA repre- sents the closed position of the control valve element 5, 20 mA represents the open position of the control valve element 5, or vice versa, and values in between 4 and 20 mA represents positions between the closed position and the open position of the control valve element 5.
The control unit 14 is adapted to determine the position of the drive shaft 16 on basis of the re- ceived control signal 20, and rotate the drive shaft 16 to the determined position between the first position and the second position. The control signal 20 may be received continuously or at certain time interval.
The control unit 14 comprises a logic unit 22, such as a CPU, a motor controller, etcetera, and memory storage 24. The logic unit 22 is adapted to handle the calibration of the drive unit 3 for the specific configuration of the connected control valve element 5 and the operation of the drive unit 3.
The drive unit 3 further comprises a rotary encoder 30 arranged at the drive shaft 16 and a detec- tor 32. The rotary encoder 30 arranged to indicate a plurality of angular positions between the first position and the second position of the drive shaft 16. The detector 32 is arranged to detect a position of the drive shaft 16 relating to the first position and/or the second position of the drive shaft 16. The control unit 14 is adapted to receive information from the rotary encoder 30, the detector 32 and the electric motor 10. The information from the electric motor 10 is for example relating to the current and voltage to the motor. 8 The detection of the first position and/or the second position of the drive shaft 16 is done at a startup phase of the drive unit 3 in order to calibrate the drive unit 3 for the configuration of the connected control valve element 5.
The control unit 14 is adapted, at startup of the of the drive unit 3, to rotate the drive shaft 16 un- til detecting the first position and/or the second position, and determine and store the angular position of the rotary encoder 30 at the respective first position and/or second position of the drive shaft 16 on basis of the detected position of the first position and/or the second position and information of the angular rotation between the first and the second position. The angular position may also be stored for both the first position and the second position of the drive shaft during cali- bration of the drive unit 3. Thereby, information on the rotational angular rotation between the first position and the second position of the drive shaft 16 is not necessary for the determination of the first position and the second position. The stored angular position of the rotary encoder 30 is used during operation to assured that the drive shaft 16 is rotated to the correct position in de- pendency of the received control signal 20. The calibration and the control of the drive unit 3 will be discussed further in details in connection to fig. 2.
According to an embodiment of the invention, the detector 32 is a proximity sensor that indicates when the drive shaft 16 is in at least one of the first position and the second position without phys- ical contact with the drive shaft 16. The proximity sensor comprises a marker 35 arranged on the drive shaft 16 and a sensor element 37 is arranged to detect when the marker 34 and the sensor element 37 are aligned The proximity sensor is for example one of a capacitive sensor, a Doppler effect, an eddy-current sensor, an inductive sensor, a laser sensor, a magnetic sensor, an inductive sensor, an optical sen- sor, a thermal infrared sensor, a photocell, an ultrasonic sensor, an Hall effect sensor.
According to an alternative embodiment of the invention, the drive shaft 16 is provided with a mechanical stop. The mechanical stop is arranged at the first position and/or the second position of the drive shaft 16. The detector 32 comprises a sensor element adapted to measure the momen- tum of the drive shaft 16 and the control unit 14 is adapted to determine when the drive shaft 16 is in the first position and/or the second position in dependency of a significant change in said measured momentum. The significant change is for example, the detection of a threshold value of the momentum of the drive shaft 16 in the interval of 10 to 30% of the operational momentum of the drive shaft 16, preferably a threshold value of the momentum in the interval of 15 to 25% of the operational momentum of the drive shaft 16.
Fig. 2 shows a flow chart of a method for controlling the drive unit 3 in fig. 1 according to an embodiment of the invention. The method comprises a calibration of the drive unit 3 in the method 9 steps 110-140, and operation of drive unit 3 for the control of the control valve element 5 in the method step 150-170.
The method is initiated in a step 110 by receiving information on the angular rotation between the first position and the second position of the drive shaft 16. The information is for example received from a setting arrangement comprising one or more DIP-switches. In the case when the control unit is connected to single loop controller with 4-20 mA interval control, the configuration of the drive unit can be performed by means of DCS-bus communication protocol, such as the setting of rotational angel between the first and the second position of the drive shaft and information on manner of detecting the first and/or the second position of the drive shaft. The first and/or the second position of the drive shaft is/are for example detected by means of a proximity sensor or a threshold in the momentum of the drive shaft when the drive shaft is rotated towards a mechanical stop.
In a step 120, the method comprises rotating the drive shaft 16 while using the detector 32 for de- tecting the position of the first position and/or the second position of the drive shaft 16, The drive shaft 16 is preferably during detection of the first position and/or the second position rotated at a lower speed of rotation than the speed of rotation used during the control of the control valve element 5.
In a step 130, the method comprises bringing the drive shaft 16 to a stand still position when the first position and/or the second position is/are detected. In a step 140, the method comprises storing the rotational position of the drive shaft 16 in the first position as a first rotational value and the rotational position of the drive shaft 16 in the second position as a second rotational value.
The drive shaft 16 is brought to a stand still in order to accurately determine the rotational posi- tion of the drive shaft 16 in the detected position. Thereafter, the rotational position in the first position and the second position is stored in the memory unit 24.
In a step 150, the method comprises receiving a control signal 20 for the control of the control valve element 5. The control signal 20 is an external signal originating from a control center of the industrial facility in which the control valve element is arranged. The control signal 20 is for example an analog electric signal, such as 4-20 mA.
In a step 160, the method comprises determining a position of the drive shaft 16 that corresponds to the received control signal 20. For example, a 4 mA control signal 20 represents a closed posi- tion, wherein the drive shaft 16 is to be arranged on the first position. Correspondingly, a 20 mA control signal 20 represents an open position, wherein the drive shaft 16 is to be arranged on the second position. A control signal 20 with a value between 4 and 20 mA represents a position of the drive shaft 16 between the first and the second position. The position of the drive shaft 16 is determined and scaled to the value of the rotary encoder 30 that corresponds to the desired position.
In a step 170, the method comprises rotating the drive shaft 16 to the determined a position hay- ing the value of the rotary encoder 30 that corresponds to the desired position.
The method steps of 150-170 are iterated at certain time interval during the control of the control valve element 5 in order to assure that the control valve element 5 is controlled at a suitable rate.
The present invention is not limited to the disclosed embodiments but may be modified within the framework of the claims.

Claims (14)

Claims 1. A drive unit (3) for controlling a control valve element (5), the drive unit (3) comprises:
1. an electric motor (10) comprising a drive shaft (16) adapted to be connected to a control shaft (7) of the control valve element (5), 2. a gear box (12) adapted to control the output momentum of the drive shaft (16), and 3. a control unit (14) adapted to receive a control signal (20) and to control the electric motor (10) so that the drive shaft (16) is rotated to positions between a first position corresponding to a closed state of the control valve element (5), and a second position corresponding to an open state of the control valve element (5), in dependency of the control signal (20), characterized in that the electric motor is of a type configured to allow rotation of the drive shaft a number of revolutions, the electric motor (10), the gear box (12) and the control unit (14) are combined in a single mechatronic unit (15), the drive unit (3) further comprises a detector (32) adapted to detect, at startup of the drive unit (3), at least one position of the drive shaft (16) corresponding to any of the first and second position of the drive shaft (16), and the control unit is adapted to determine the first and second position of the drive shaft based on the at least one detected position.
2. The drive unit (3) according to claim 1, wherein the control unit (14) is adapted to receive information on the angular rotation between the first position and the second position of the drive shaft (16), and determine the first and second position of the drive shaft (16) based on the at least one detected position and the angular rotation between the first position and the second position.
3. The drive unit (3) according to any of claim 1 and 2, wherein the drive unit (3) comprises a rotary encoder (30) arranged to indicate a plurality of angular positions between the first position and the second position of the drive shaft (16), wherein the control unit (14) is adapted, at startup of the of the drive unit (3), to rotate the drive shaft (16) until detecting at least one of the first position and the second position, and determine and store the angular position of the rotary encoder (30) at the first position and the second position of the drive shaft (16).
4. The drive unit (3) according to any of the previous claims, wherein the detector (32) comprises a position sensor that is adapted to indicate when the drive shaft (16) is in at least one of the first position and the second position.
5. The drive unit (3) according to claim 4, wherein the position sensor is a proximity sensor that in- dicates when the drive shaft (16) is in at least one of the first position and the second position without physical contact with the drive shaft (16). 11 12
6. The drive unit (3) according to claim 5, wherein the proximity sensor is one of a capacitive sensor, a Doppler effect, an eddy-current sensor, an inductive sensor, a laser sensor, a magnetic sensor, an inductive sensor, an optical sensor, a thermal infrared sensor, a photocell, an ultrasonic sensor, an Hall effect sensor.
7. The drive unit (3) according to any of the previous claims, wherein the drive shaft (16) comprises a mechanical stop arranged at at least one of the first position and the second position of the drive shaft (16), and the detector (32) comprises a sensor adapted to measure the momentum of the drive shaft (16), wherein the control unit (14) is adapted to determine that the drive shaft (16) is in the at least one of the first position and the second position in dependency of a significant change in said measured momentum.
8. The drive unit (3) according to claim 7, wherein the significant change in said detected momentum constitutes a threshold of the momentum in the interval of 10 to 30% of the operational mo- mentum of the drive shaft (16), preferably a threshold of the momentum in the interval of 15 to 25% of the operational momentum of the drive shaft (16).
9. The drive unit (3) according to any of the previous claims, wherein the mechatronic unit (15) is encapsulated from the surrounding environment.
10. The drive unit (3) according to any of the previous claims, wherein the drive unit (3) comprises a connection element for connecting the drive shaft (16) to the control shaft (7) of the control valve element (5).
11. A method for operating a drive unit (3) for a control valve element (5), wherein the drive unit (3) comprises an electric motor (10) comprising a drive shaft (16) connected to a control shaft (7) of the control valve element (5) and adapted to be rotated between a first position relating to a closed state of the control valve element (5) and a second position relating to a open state of the control valve element (5), wherein the drive unit (3) further comprises a control unit (14) for con- trolling the rotation of the drive shaft (16) and a detector (32) for detecting a position of the drive shaft (16) relating to at least one of the first position and the second position of the drive shaft (16), the method comprises the steps of 1. rotating the drive shaft (16) while using the detector (32) for detecting the position of at least one of the first position and the second position of the drive shaft (16), - bringing the drive shaft (16) to a stand still when detecting the position of the at least one of the first position and the second position of the drive shaft (16), and 2. determining and storing the rotational position of the drive shaft (16) in the first position and the rotational position of the drive shaft (16) in the second position based on the at least one detected position. 13
12. A method according to claim 11, wherein the method comprises: 1. receiving information on the angular rotation between the first position and the second position of the drive shaft (16), - determining and storing the rotational position of the drive shaft (16) in the first position and the rotational position of the drive shaft (16) in the second position based on the at least one detected position and the angular rotation between the first position and the second position.
13. A method according to any of claim 11 and 12, wherein the method further comprises: - receiving a control signal (20) for the control of the control valve element (5), 1. determining a position of the drive shaft (16) that corresponds to the control signal (20), and 2. rotating to the drive shaft (16) to the determined a position.
14. A control valve unit (1) comprising a drive unit (3) according to any of claims 1-10 and a control valve element (5). Patentansokan nr / Patent application No: 1550334- foljande bilaga finns en oversattning av patentkraven till svenska. Observera att det är patentkravens lydelse pa engelska som A Swedish translation of the patent claims is enclosed. Please note that only the English claims have legal effect.
SE1550334A 2015-03-20 2015-03-20 A drive unit for controlling a control valve element, a method for operating a drive unit of a control valve element anda control valve unit SE1550334A1 (en)

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SE1550334A SE1550334A1 (en) 2015-03-20 2015-03-20 A drive unit for controlling a control valve element, a method for operating a drive unit of a control valve element anda control valve unit
PCT/EP2016/054026 WO2016150644A1 (en) 2015-03-20 2016-02-25 A drive unit for controlling a control valve element, a method for operating a drive unit of a control valve element and a control valve unit

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SE1550334A SE1550334A1 (en) 2015-03-20 2015-03-20 A drive unit for controlling a control valve element, a method for operating a drive unit of a control valve element anda control valve unit

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EP3480502A1 (en) * 2017-11-01 2019-05-08 Kamstrup A/S Stand-alone ball valve actuator

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JP2004003404A (en) * 2002-06-03 2004-01-08 Hitachi Ltd Electronically controlled throttle valve device, non-contact rotation angle sensitive device used therefor, and signal processing device of hall element
CH708995B1 (en) 2004-03-19 2015-06-30 Belimo Holding Ag Reduction gear of an electrically operated actuator.
JP2007285173A (en) * 2006-04-14 2007-11-01 Denso Corp Valve opening/closing control device
NL2008990C2 (en) * 2012-06-12 2013-12-16 Mci Mirror Controls Int Nl Bv ADJUSTMENT DEVICE AND METHOD FOR ADJUSTING TERMINAL ELEMENTS.
JP5772790B2 (en) * 2012-08-02 2015-09-02 株式会社デンソー Valve device

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Publication number Priority date Publication date Assignee Title
WO2017039525A1 (en) * 2015-09-04 2017-03-09 Lobsor Pharmaceuticals Aktiebolag Method of treating a dopamine related disorder in a subject by administering levodopa, in combination with a dopamine decarboxylase inhibitor and a catechol-o-methyltransferase inhibitor

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