WO2013000726A1 - Transformer including a contactless signal connection - Google Patents
Transformer including a contactless signal connection Download PDFInfo
- Publication number
- WO2013000726A1 WO2013000726A1 PCT/EP2012/061320 EP2012061320W WO2013000726A1 WO 2013000726 A1 WO2013000726 A1 WO 2013000726A1 EP 2012061320 W EP2012061320 W EP 2012061320W WO 2013000726 A1 WO2013000726 A1 WO 2013000726A1
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- WIPO (PCT)
- Prior art keywords
- stator
- rotor
- shaft
- transformer
- sensor
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
- H02K11/012—Shields associated with rotating parts, e.g. rotor cores or rotary shafts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F19/00—Fixed transformers or mutual inductances of the signal type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/18—Rotary transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
- H02K11/014—Shields associated with stationary parts, e.g. stator cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
- H02K7/145—Hand-held machine tool
Definitions
- the present invention relates to a transformer as defined in the preamble of claim 1.
- the present invention also relates to a method for providing a contactless signal connection as defined in the preamble of claim 18.
- a fastener tool being arranged for tightening a fastener, e.g. a nut-runner
- a fastener e.g. a nut-runner
- torque values of the torque being applied to the fastener and corresponding angle values are utilized for estimating this clamping force.
- the torque being applied to the joint is here measured as a reaction torque generated in a reduction gearing of the fastener tool and corresponds to the torque the fastener exerts on the fastener tool while being tightened.
- the reaction torque does not fully reflect the dynamic torque being applied to the fastener, wherefore low accuracy measurements are provided when the fasteners are tightened at high speed.
- Another solution which eliminates the influence of the poor dynamic response in measurements, is preferable.
- One solution is then to utilize one or more sensors being located directly on the outgoing shaft.
- excitation signals to and sensor signals from the one or more sensors being located on a shaft of the fastener tool, which rotates in use need to be coupled between the shaft and a body of the fastener tool in order to be able to perform such measurements.
- These sensor signals result from an excitation being based on the excitation signals.
- the excitation signals can e.g. be torque excitation signals or ultrasonic excitation signals.
- slip rings for coupling the signals between the shaft and the body when measuring the torque.
- the use of slip rings does, however, have a disadvantage in that the slip rings get worn out, for example due to frictional wear, after having being used for some time. Also, the use of slip rings can limit the highest allowable rotational speed for the shaft.
- a rotary transformer is a transformer especially being arranged for coupling signals between two parts that rotate in relation to each other.
- Rotary transformers generally include first and second windings in separate first and second parts, respectively, not being in physical contact with each other. Magnetic flux provides the coupling between the first and second parts, by use of the mutual inductance coupling energy between the first and second windings.
- a rotary transformer is shortly described in EP 0 502 748.
- a strain gauge is applied directly on the main spindle, i.e. on the shaft, and the output signal of the strain gauge is provided by a rotary transformer having a primary coil on the main spindle and the secondary coil on the housing of the tool.
- the known rotary transformers being utilized for torque measurements in a fastener tool having a body/housing being fixed in relation to the joint to be tightened, have a problem in that their electromagnetic coupling between the shaft and the body of the fixated tool is affected when the fastener is being tightened.
- the signal coupling of the rotary transformer is lost, which is of course very disadvantageous since the measurement of the applied torque, and therefore the determination of the clamping force is thereby affected.
- an inadequate clamping force being provided to the joint can result. This can seriously affect the reliability of the joint, and can also result in damage being made to the joint.
- the present invention aims to provide a more flexible transformer and method than the ones known in the background art.
- the transformer and the method according to the present invention are characterized in that a contactless signal connection is provided by the transformer, and that the contactless signal connection can handle both rotational and axial movements of the shaft of the fastener tool.
- This flexible signal connection which provides a contactless sensor signal connection also when a fastener moves down the thread, is achieved by the geometrical constitution of the stator and the rotor of the transformer.
- the stator and the rotor are thus formed and arranged to have a mutual geometrical relationship, which allows for the shaft to also move in the axial direction without affecting the transfer of the excitation and sensor signals.
- a reliable transformer is thereby provided, which keeps its signal connection intact during essentially all kinds of movements of the shaft in relation to the body of the tool.
- the tool may thereby flexibly be used in a large number of situations, including fixation of the tool, without risk of loss of the signal connection due to axial movement of the shaft. Thereby, a more robust clamping force determination is provided.
- the mutual geometrical relationship includes a geometrical relation between at least one part of the stator and at least one part of the rotor, wherein this geometrical relation is essentially unchanged during both rotational and axial movement of the shaft.
- This geometrical relation is, according to an embodiment of the invention, constituted by a mutual distance between the at least one part of the stator and the at least one part of the rotor.
- a distance between the stator and the rotor which is unaltered when the shaft rotates and also when the shaft is shifted axially, e.g. due to tightening of a fastener such as a nut.
- the signal connection of the transformer is made reliable and flexible to all kinds of movements for a shaft of e.g. a fastener assembly tool.
- the stator is formed to have a one rim inner surface and rotor is formed to have a one rim outer surface. These one rim surfaces makes axial movement of the shaft possible, and the also together form the geometrical relationship being unaltered during this axial movement, whereby the signal connection is reliably provided.
- At least one of the stator and the rotor is at least partly shielded.
- the shielding means is here applied on at least part of at least one wall delimiting an air pocket between the stator and the rotor.
- the flux leakage over the air pocket is greatly reduced, which improves the transformer function.
- the transformer is used for transferring excitation signals and sensor signals for an ultrasonic sensor.
- the contact between the ultrasonic sensor and the fastener is not lost.
- the present invention is therefore especially applicable for use of ultrasonic sensors, since axial shaft movement without loss of signal connection is possible due to the invention.
- Fig. 1 shows a fastener tool
- Fig. 2a shows a stator according to the present invention.
- Fig. 2b shows a rotor according to the present invention.
- Fig. 2c shows a stator and a rotor fitted together according to the present invention.
- FIG 1 schematically shows a fastener tool 100.
- the fastener tool 100 In this figure, only parts being essential for the function of the invention have been described. Other features of the fastener tool 100, such as handles, power supplying cables or batteries, the electrical motor, gearing equipment, and the socket holding the fastener, are also included in the fastener tool 100, as is understood by a skilled person.
- the fastener tool 100 includes a body 110 and a shaft/spindle 120, which is movable in relation to the body 110.
- the shaft 120 performs a rotational movement in relation to the body 110 e.g. when a fastener, such as a nut, is being tightened.
- the tool also includes a transformer 130, which provides a sensor signal connection between the shaft 120 and the body 110 of the fastener tool 100.
- sensors being provided on the shaft 120 receive excitation signals, such as torque excitation signals or ultrasonic excitation signals, being transferred by the transformer 130 from the body 110 to the shaft 120.
- a control unit being included in the body 110 is coupled to the transformer 130.
- the control unit supplies the transformer 130 with excitation signals.
- the control unit can also be external to the tool 100, and be connected to the body and/or transformer 130 by a suitable connection, such as a cable or a wireless connection.
- the transformer 130 also transfers sensor torque signals from the shaft 120 to the body 110.
- the transformer 130 is also coupled to the one or more sensors being arranged on the shaft 120.
- the control unit being included in the body 110 of the tool thus receives sensor torque signals that via the transformer 130 that are provided by the sensors based. These sensor torque signals are based on the excitation signals.
- the transformer 130 includes a stator, being fixed in relation to and included in the body 110 of the fastener tool 100, and a rotor, which is movable with the shaft 120.
- a stator being fixed in relation to and included in the body 110 of the fastener tool 100
- a rotor which is movable with the shaft 120.
- stator 210 and the rotor 220 are shown in figures 2a and 2b, respectively.
- the stator 210 and the rotor 220 are, according to the present invention arranged such that they have a geometrical relationship between them when fitted together, which allows a contactless signal connection to be provided when the shaft 120 performs a rotational movement in relation to the body 110 and also when the shaft 120 performs an axial movement in relation to the body 110.
- the stator 210 and the rotor 220 have a mutual geometrical relationship, i.e. they each have a form and are in use related to each other such that the signal connection is kept intact also when an axial movement of the shaft 120 occurs. This will be explained more in detail below in connection with figures 2a-c.
- the stator 210 has an essentially tubular form, having an outer peripheral diameter 211 being essentially equal for the whole length 212 of the stator 210.
- the stator 210 further has a first inner diameter 213 for a first part of the stator having a first length 214, and a second inner diameter 215 for a second part of the stator, where the first inner diameter 213 is smaller than the second inner diameter 215.
- the stator 210 is essentially tubular with an inner surface having one step, i.e. having a first part, which has a first inner diameter 213 being less than the second inner diameter 215 of the second part of the stator 210.
- the stator 210 has an inner surface containing one rim.
- the rotor 220 also has an essentially tubular form, having an inner diameter 221 being essentially equal for the whole length 222 of the rotor 220.
- the rotor 220 further has a first outer diameter 223 for a first part of the stator, and a second outer diameter 225 for a second part of the rotor having a second length 224, where the first outer diameter 223 is smaller than the second outer diameter 225.
- the rotor 220 is essentially tubular with an outer surface having one step, i.e. has a first part, which has a first outer diameter 223 being less than the second outer diameter 225 of the second part of the stator 210.
- the rotor 220 has an outer surface containing one rim.
- the first outer diameter 223 of the rotor 220 is smaller than the first inner diameter 213 of the stator, and the second outer diameter 225 of the rotor 220 is smaller than the second inner diameter 215 of the stator.
- the rotor 220 can be inserted into the stator 210.
- the stator 210 and the rotor 220 are fitted together like this, i.e. the rotor being inserted into the stator, air gaps are formed between the first parts of the rotor and stator, and between the second parts of the of the rotor and stator, respectively.
- the air gaps having first and second distances/widths 231, 232, respectively, are here radially limited by the second (larger) outer diameter 225 of the rotor 220 and the second (larger) inner diameter 215 of the stator 210, and by the first (smaller) outer diameter 223 of the rotor 220 and the first (smaller) inner diameter 213 of the stator 210, respectively, as will be described below.
- Figure 2c shows a schematic longitudinal section view of part of the stator 210 and a part of the rotor 220 in use, i.e. when they are assembled together in the transformer, such that the rotor 220 is inserted into the stator 210. It is clearly shown in figure 2c that the one step/rim inner surface of the stator 210 and the one step/rim outer surface of the rotor 220 together form a mutual geometrical relationship between the stator 210 and the rotor 220. Thus, the first 213 and second 215 inner diameters of the stator 210 and the first 223 and second 225 outer diameters of the rotor 220 together form this mutual geometrical relationship.
- the first 213 and second 215 inner diameters of the stator 210 and the first 223 and second 225 outer diameters of the rotor 220 together form first 231 and second 232 mutual distances between the first and second parts, respectively, of the stator 210 and the rotor 220.
- Figure 2c also shows the one or more stator windings 216 and the one or more rotor windings 226.
- the mutual geometrical relationship includes at least one of these first 231 and second 232 mutual distances between the stator 210 and the rotor 220.
- the geometrical relationship is formed between at least one part of the stator 210 and at least one part of the rotor 220. This mutual geometrical relationship is essentially unchanged when the shaft 120 moves in a rotational direction, and, up to a predetermined length L , also in the axial direction A .
- the length L here depends on the first length 214 of the first part of the stator and to the second length 224 of the second part of the rotor.
- the first and second mutual distances 231, 232 are only kept unaltered until an axial movement corresponding to the shorter one of the first length 214 of the stator and the second length 224 of the rotor has been reached. Since the first length 214 of the stator is shorter than the second length 224 of the rotor in the non-limiting example shown in figure 2c, the length L here corresponds to the first length 214 of the stator.
- the predetermined length L is greater than a minimum length L min .
- the shorter one of the first length 214 of the stator and the second length 224 of the rotor is here longer than the minimum length L min .
- the minimum length L min corresponds to a length the fastener is to be tightened in order to tighten a joint.
- the minimum length L min corresponds to a length of the threads of a screw or bolt to be tightened by the tool, such that the screw or bolt can be securely tightened.
- the minimum length L min is related to the axial length of the rotary transformer.
- the minimum length L min is thus related to the whole length 212 of the stator 210 or to the whole length 222 of the rotor 220.
- the first length 214 of the first part of the stator is related to the whole length 212 of the stator 210
- the second length 224 of the second part of the rotor 220 is related to the whole length 222 of the rotor 220.
- the minimum length L min corresponds to 30%-60%, and preferably to 45%-50%, of the whole length 212 of the stator 210 and/or corresponds to 30%-60%, and preferably to 45%-50% of the whole length 222 of the rotor 220.
- the first length 214 of the stator is shorter than the second length 224 of the rotor, then the first length 214 of the stator is 30%-60%, and preferably 45%-50%, of the whole length 212 of the stator.
- the second length 224 of the second part of the rotor is 30%-60%, and preferably 45%-50%, of the whole length 222 of the rotor 220.
- the inner surface of the stator 210 and the outer surface of the rotor 220 each have their one step/rim located at 30%-60%, and preferably 45%-50% of the whole length 212, 222 of the stator and rotor, respectively.
- the the one step/rim inner surface of the stator 210 and one step/rim outer surface of the rotor 220 together form the mutual geometrical relationship between the stator 210 and the rotor 220.
- the minimum length L min can typically be a number of centimetres, i.e. 1-20 centimetres, preferably 3-15 centimetres, such that a fastener can be fully tightened without interrupting the contactless signal connection.
- An air pocket 233 is formed between the stator 210 and the rotor 220 when they are fitted together.
- the axial length L air of the air pocket 233 is axially limited by the first length 214 of the first part of the stator and by the second length 224 of the rotor, i.e. by the steps/rims of the stator 210 and rotor 220, respectively.
- the air pocket length L air corresponds to 5-10%, and preferably 6-7%, of the whole length 212 of the stator and/or 5-10%, and preferably 6-7%, of the whole length 222 of the rotor.
- stator 210 and the rotor 220 having the forms as described above and being fitted together, result in a mutual geometric relationship being formed between them, such that a magnetic field B being shared by the stator and rotor windings 216, 226 is usable as a contactless signal connection providing a connection during both rotational and axial movement of the shaft of the tool. This is very advantageous, for example in situations when the tool is fixedly arranged.
- the stator windings 216 are arranged on the inside of the second part of the stator and facing the outside of the first part of the rotor. I.e., the stator windings 216 are arranged on the second inner diameter 215 of the stator 210.
- the rotor windings 226 are arranged on the outside of the first part of the rotor and facing the inside of the second part of the stator. I.e. the rotor windings 226 are arranged on the first outer diameter 223 of the rotor 220.
- stator windings 216 and rotor windings 226 are arranged such that they face the air pocket 233 being formed between the stator 210 and the rotor 220.
- the air pocket 233 is here radially limited by the first (smaller) outer diameter 223 of the rotor 220 and by the second (larger) inner diameter 215 of the stator 210.
- the magnetic field B here provides the coupling between the stator 210 and the rotor 220 by use of the mutual inductance coupling energy between the stator and rotor windings 216, 226.
- electric energy being applied to the stator windings 216 will essentially immediately be transferred to the rotor windings 226.
- electric energy being applied to the rotor windings 226 will essentially immediately be transferred to the stator windings 216.
- stator 210 the contactless signal connection between stator 210 and the rotor 220, and thereby also between the body 110 and the at least one sensor arranged on the shaft 120 of the power tool 100, is created.
- This signal connection is used for transmission of the excitation signals from the stator 210 to the rotor 220 and the sensor signals from the rotor 220 to the stator 210.
- At least one sensor being arranged on the shaft 120 can provide a sensor signal being related to, e.g. being proportional to, a torque the shaft exerts on e.g. a fastener, such as a nut, it engages with to the body of the tool via the transformer.
- a control unit can be included within the body of the tool, or external to the tool, and can be arranged for receiving the signals being transferred by the transformer.
- At least one of the first 231 and second 232 mutual distances forms an air gap between the stator 210 and the rotor 220.
- the geometrical relationship is here constituted by an air gap distance between at one least part of stator 210 and at least one part of the rotor 220.
- the widths of these air gaps 231, 232 are, as has been described above, constant, i.e. unaltered, during rotational R and axial A movement of the shaft 120.
- At least one ultrasonic sensor is arranged on the shaft.
- the one or more ultrasonic sensors are here excited by an excitation signal being provided to the shaft 120 by the transformer 200.
- This at least one ultrasonic sensor which can include a piezoelectric element, has to be in contact with the external entity the shaft engages with, e.g. a fastener, to be able to detect the strain of the external entity and therefore the clamping force being provided. It is therefore very important when ultrasonic sensors are being used that no loss of contact occurs between the sensor and the external entity.
- the present invention is very advantageous to use when ultrasonic sensors are used, since the performance of the contactless signal connection is guaranteed also during axial movement of the shaft 120.
- At least one shielding means 217, 227 is arranged on at least one of the stator 210 and the rotor 220.
- This at least one shielding means 217, 227 is arranged on at least one wall delimiting the above mentioned air pocket 233 being formed between the stator 210 and the rotor 220.
- the at least one shielding means 217, 227 is arranged on one or more of the first outer diameter 223 of the rotor 220 and the second inner diameter 215 of the stator 210.
- the wanted magnetic flux is the magnetic flux passing through the air gaps of the first and second mutual distances 231, 232 between the stator 210 and the rotor 220.
- there is generally also a flux leakage present which passes through the air flow pocket 233 between the stator 210 and the rotor 220.
- the shielding means 217, 227 are, according to an embodiment of the invention, made of a metal, such as copper, or another metal having suitable shielding characteristics.
- a method for providing a contactless signal connection for a tool 100 comprises a body 110 and a shaft 120 being movable in relation to the body 110, as described above.
- a transformer 130, 200 is utilized, which comprises a stator 210, being fixed in relation to the body 110, and a rotor 220, being movable with the shaft 120, both including one or more windings 216, 226.
- a magnetic field B which is shared by these windings, is utilized for creating a contactless signal connection between the body 110 and at least one sensor of the shaft 120.
- a mutual geometrical relationship is formed between the stator 210 and the rotor 220, by the shapes and the mutual fitting of the stator 210 and the rotor 220, such that the contactless signal connection is kept intact for both different axial and rotational movement of the shaft 120.
- the Transformer and the method according to the invention may be modified by those skilled in the art, as compared to the exemplary embodiments described above.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Description
Claims (18)
- A transformer (130, 200) for use in a power tool (100) comprising a stationary body (110) and a shaft (120) having at least one sensor and being movable in relation to said body (110), said transformer (130, 200) comprising: - a stator (210), being fixed in relation to said body (110) and including one or more stator windings (216), and - a rotor (220), being movable with said shaft (120) and including one or more rotor windings (226), whereby - a magnetic field B is shared by said one or more stator windings (216) and said one or more rotor windings (226), and is used for creating a contactless signal connection between said body (110) and said at least one sensor of said shaft, characterized in that said stator (210) and said rotor (220) are arranged for forming a mutual geometrical relationship such that said contactless signal connection is provided for different positions in both an axial direction A and a rotational direction R of said shaft (110).
- Transformer (130, 200) as claimed in claim 1, wherein said magnetic field B is arranged to carry: - an excitation signal from said stator (210) to said rotor (220); and - a sensor signal from said rotor (220) to said stator (210), wherein said sensor signal is resulting from an excitation based on said excitation signal.
- Transformer (130, 200) as claimed in claim 2, wherein said excitation signal is an ultrasonic signal.
- Transformer (130, 200) as claimed in claim 2, wherein said excitation signal is a signal proportional to a torque being exerted on a fastener by said power tool (100).
- Transformer (130, 200) as claimed in anyone of claims 1-4, wherein said mutual geometrical relationship is a geometrical relation between at least one part of said stator (210) and at least one part of said rotor (220), and is essentially unchanged by a movement of said shaft, up to a predetermined length L, in said axial direction A.
- Transformer (130, 200) as claimed in claim 5, wherein said mutual geometrical relationship is a distance (231, 232) across an air gap between at least one part of said stator (210) and at least one part of said rotor (220).
- Transformer (130, 200) as claimed in claim 5, wherein said predetermined length L is greater than a minimum length L min corresponds to a length the fastener is to be tightened in order to tighten a joint.
- Transformer (130, 200) as claimed in anyone of claims 1-7, wherein said stator (210) is formed to have a one rim inner surface and said rotor (220) is formed to have a one rim outer surface.
- Transformer (130, 200) as claimed in anyone of claims 1-8, wherein at least one of said stator (210) and said rotor (220) is at least partly arranged with shielding means (217, 227) for reducing a flux leakage between said stator (210) and said rotor (220).
- Transformer (130, 200) as claimed in claim 9, wherein said shielding means (217, 227) is arranged on at least one part of at least one wall of at least one of said stator (210) and said rotor (220), respectively, wherein said at least one part of said at least one wall at least partly delimits an air pocket (233) formed between said stator (210) and said rotor (220).
- Transformer (130, 200) as claimed in anyone of claims 1-10, wherein said signal connection is an electrical signal connection.
- A power tool (100) comprising a stationary body (110) and a shaft (120) being movable in relation to said body (110), characterized by - a transformer (130, 200) as claimed in anyone of claims 1-11.
- Power tool (100) as claimed as claimed in claim 12, wherein said shaft (120) comprises at least one torque sensor, said torque sensor being arranged for providing a sensor signal being proportional to a torque said shaft (120) is arranged for exerting on an external entity which said shaft (120) engages with.
- Power tool (100) as claimed in claim 13, wherein said at least one torque sensor is excited by an excitation signal being transferred to said torque sensor by use of said contactless signal connection.
- Power tool (100) as claimed claim 12, wherein said shaft (120) comprises at least one ultrasonic sensor, said ultrasonic sensor being arranged for providing a sensor signal being proportional to a clampload being exerted on parts that are being clamped by a fastener.
- Power tool (100) as claimed in claim 15, wherein said at least one ultrasonic sensor is excited by an excitation signal being transferred to said ultrasonic sensor by use of said contactless signal connection.
- Power tool (100) as claimed in anyone of claims 12-16, wherein said power tool (100) is a fastener assembly tool.
- Method for providing a contactless signal connection for a power tool (100) comprising a stationary body (110) and a shaft (120) having at least one sensor and being movable in relation to said body (110), said method utilizing a transformer (130, 200) comprising a stator (210), being fixed in relation to said body (110) and including one or more stator windings (216), and a rotor (220), being movable with said shaft (120) and including one or more rotor windings (226), for creating a contactless signal connection between said body (110) and said at least one sensor of said shaft (120) by use of a magnetic field B being shared by said one or more stator windings (216) and said one or more rotor windings (226), characterized in the step of: - forming a mutual geometrical relationship between said stator (210) and said rotor (220) such that said contactless signal connection is provided for different positions in both an axial direction A and a rotational direction R of said shaft (110).
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/129,852 US9515535B2 (en) | 2011-06-30 | 2012-06-14 | Transformer including a contactless signal connection |
KR1020147002513A KR101920103B1 (en) | 2011-06-30 | 2012-06-14 | Trasnformer including a contactless signal connection |
JP2014517577A JP6029663B2 (en) | 2011-06-30 | 2012-06-14 | Non-contact signal connection type transformer |
EP12728480.0A EP2726253B1 (en) | 2011-06-30 | 2012-06-14 | Transformer including a contactless signal connection |
CN201280032632.5A CN103635293B (en) | 2011-06-30 | 2012-06-14 | Transformer including a contactless signal connection |
BR112013033515-7A BR112013033515B1 (en) | 2011-06-30 | 2012-06-14 | ELECTRIC TOOL |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1150615-1 | 2011-06-30 | ||
SE1150615A SE537050C2 (en) | 2011-06-30 | 2011-06-30 | Transformer comprising a contactless signal connection |
Publications (1)
Publication Number | Publication Date |
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WO2013000726A1 true WO2013000726A1 (en) | 2013-01-03 |
Family
ID=46320936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2012/061320 WO2013000726A1 (en) | 2011-06-30 | 2012-06-14 | Transformer including a contactless signal connection |
Country Status (8)
Country | Link |
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US (1) | US9515535B2 (en) |
EP (1) | EP2726253B1 (en) |
JP (1) | JP6029663B2 (en) |
KR (1) | KR101920103B1 (en) |
CN (1) | CN103635293B (en) |
BR (1) | BR112013033515B1 (en) |
SE (1) | SE537050C2 (en) |
WO (1) | WO2013000726A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012141279A1 (en) | 2011-04-15 | 2012-10-18 | 新日本製鐵株式會社 | Rotary transformer for rotary ultrasonic flaw detection device and rotary ultrasonic flaw detection device using same |
SE537050C2 (en) * | 2011-06-30 | 2014-12-16 | Atlas Copco Ind Tech Ab | Transformer comprising a contactless signal connection |
CN117320843B (en) * | 2021-05-17 | 2024-05-24 | 阿特拉斯·科普柯工业技术公司 | Power tool with wireless signal transmission function |
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DE1920890A1 (en) * | 1969-04-24 | 1970-11-12 | Guenther Vogeler | Slip-ringless inductive transmitter |
US4846001A (en) * | 1987-09-11 | 1989-07-11 | Sps Technologies, Inc. | Ultrasonic load indicating member |
DE4025430A1 (en) * | 1990-08-10 | 1992-02-13 | Psm Drucklufttechnik Vertrieb | Torque controlled screwing head - has electroacoustic sensor to measure distortion of bolt under torque |
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JP2010184329A (en) * | 2009-02-13 | 2010-08-26 | Hitachi Koki Co Ltd | Power tool |
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JPS6039434U (en) * | 1983-08-24 | 1985-03-19 | トヨタ自動車株式会社 | Constant axial force bolt tightening device |
JPH0651274B2 (en) * | 1988-12-14 | 1994-07-06 | 本田技研工業株式会社 | Nut runner with torque detector and assembling method thereof |
JP2003294487A (en) * | 2002-04-02 | 2003-10-15 | Minebea Co Ltd | Mechanism for positioning rotor transformer |
FR2892848B1 (en) | 2005-10-27 | 2009-12-25 | Centre Nat Etd Spatiales | ROTATING TRANSFORMER |
US7990005B2 (en) * | 2008-02-07 | 2011-08-02 | Atlas Dynamic Devices, Llc | Power transmission tool and system |
US20110248583A1 (en) * | 2008-02-07 | 2011-10-13 | Atlas Dynamic Devices, Llc | Power Transmission Tool And System |
SE537050C2 (en) * | 2011-06-30 | 2014-12-16 | Atlas Copco Ind Tech Ab | Transformer comprising a contactless signal connection |
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2011
- 2011-06-30 SE SE1150615A patent/SE537050C2/en unknown
-
2012
- 2012-06-14 KR KR1020147002513A patent/KR101920103B1/en active IP Right Grant
- 2012-06-14 JP JP2014517577A patent/JP6029663B2/en active Active
- 2012-06-14 BR BR112013033515-7A patent/BR112013033515B1/en active IP Right Grant
- 2012-06-14 US US14/129,852 patent/US9515535B2/en active Active
- 2012-06-14 WO PCT/EP2012/061320 patent/WO2013000726A1/en active Application Filing
- 2012-06-14 CN CN201280032632.5A patent/CN103635293B/en active Active
- 2012-06-14 EP EP12728480.0A patent/EP2726253B1/en active Active
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DE1920890A1 (en) * | 1969-04-24 | 1970-11-12 | Guenther Vogeler | Slip-ringless inductive transmitter |
US4846001A (en) * | 1987-09-11 | 1989-07-11 | Sps Technologies, Inc. | Ultrasonic load indicating member |
DE4025430A1 (en) * | 1990-08-10 | 1992-02-13 | Psm Drucklufttechnik Vertrieb | Torque controlled screwing head - has electroacoustic sensor to measure distortion of bolt under torque |
EP0502748A1 (en) | 1991-03-07 | 1992-09-09 | Nissan Motor Company Limited | Impact Wrench having Torque Controlling Faculty |
JP2010184329A (en) * | 2009-02-13 | 2010-08-26 | Hitachi Koki Co Ltd | Power tool |
Also Published As
Publication number | Publication date |
---|---|
US20140145811A1 (en) | 2014-05-29 |
EP2726253A1 (en) | 2014-05-07 |
BR112013033515B1 (en) | 2021-10-19 |
JP2014518166A (en) | 2014-07-28 |
EP2726253B1 (en) | 2018-11-14 |
SE1150615A1 (en) | 2012-12-31 |
CN103635293B (en) | 2015-06-10 |
KR20140046451A (en) | 2014-04-18 |
JP6029663B2 (en) | 2016-11-24 |
BR112013033515A2 (en) | 2017-02-07 |
US9515535B2 (en) | 2016-12-06 |
CN103635293A (en) | 2014-03-12 |
KR101920103B1 (en) | 2019-02-08 |
SE537050C2 (en) | 2014-12-16 |
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