Wireless electric energy transmission system for rotating shaft equipment

Abstract

The invention provides a wireless electric energy transmission system for rotating shaft equipment, and belongs to the technical field of wireless electric energy transmission. The wireless power transmission system for the rotating shaft equipment comprises a magnetic circuit coupler; an energy transmitting coil; a transmitting end high-frequency resonance circuit; a transmitting terminal start-stop control circuit; mounting a bracket; a magnetic circuit coupling array; and an energy receiving coil and a receiving end high-frequency rectification and power conversion circuit. The magnetic circuit coupler guides a high-frequency magnetic field generated by the energy transmitting coil to the magnetic circuit coupling array, the magnetic circuit coupling array receives the high-frequency magnetic field and enables magnetic flux to penetrate through the energy receiving coil, and the two ends of the energy receiving coil are connected with a receiving end high-frequency rectification and power conversion circuit which is used for conducting rectification, voltage stabilization and power conversion on alternating current generated by the energy receiving coil. The wireless electric energy transmission system is non-contact, high in safety and high in reliability, has good adaptability to possible mechanical vibration of the rotating shaft, and can replace a traditional electric brush slip ring power supply mode.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless power transmission, and in particular relates to a wireless power transmission system for a rotating shaft device. Background Art

[0002] In the past, brush slip rings were often used to power equipment on rotating shafts, and electrical energy was transmitted through the contact between the brushes and slip rings. This solution has the following problems: the brush-type power supply solution requires the installation of brushes and collector rings. The brushes usually need to be installed on the stationary part, and the collector rings are installed on the rotating shaft. This makes the mechanical structure of the power supply system large and complex.

[0003] Due to the contact between the brushes and the collector rings, arcs and sparks will be generated during high-speed rotation, which may cause electromagnetic interference to the equipment. On the other hand, brush wear will produce conductive graphite dust, which may endanger the electrical safety of the equipment. In terms of maintenance, brushes and collector rings wear quickly and need to be replaced and maintained frequently, which increases the maintenance cost and downtime of the equipment.

[0004] With the advancement of technology, contactless power supply has gradually replaced the brush slip ring system. In the wireless power supply system, a high-frequency alternating electromagnetic field is generated on the primary side of the electromagnetic coupler through power electronic devices such as inverters. The energy is transmitted to the secondary side through the electromagnetic coupler and passes through a series of conversion circuits to power the load.

[0005] During the movement of the rotating shaft, the shaking caused by mechanical structure problems is also a major challenge for the wireless power supply system. When the distance and relative position between the primary and secondary sides of the electromagnetic coupler change, the coupling coefficient of the system will also change. This will affect the operating frequency, electrical parameters, power transmission efficiency, etc. of the system, and thus affect the performance and stability of the system. Summary of the invention

[0006] The present invention is made to solve the above-mentioned problems, and its object is to provide a wireless power transmission system for a rotating shaft device.

[0007] The present invention provides a wireless power transmission system for a rotating shaft device, which has the following characteristics: a magnetic circuit coupler fixed on the ground or installed on a stationary bracket; an energy transmitting coil wound on the magnetic circuit coupler; a transmitting end high-frequency resonance circuit connected to both ends of the energy transmitting coil, used to supply power to the energy transmitting coil to generate a high-frequency magnetic field; a transmitting end start-stop control circuit connected to the transmitting end high-frequency resonance circuit, used to supply power to the transmitting end high-frequency resonance circuit and control its opening and closing; a mounting bracket, which is a circular ring structure, and a plurality of mounting grooves are evenly opened on the outer circumference of the mounting bracket, so that the rotating shaft can rotatably rotate. The mounting bracket is passed through; the magnetic circuit coupling array is composed of a plurality of strip magnetic cores, which are correspondingly embedded in a plurality of mounting grooves; the energy receiving coil is wound around the outer periphery of the magnetic circuit coupling array, wherein the magnetic circuit coupler is installed opposite to the magnetic circuit coupling array, and the magnetic circuit coupler is installed on the side of the magnetic circuit coupling array, the magnetic circuit coupler guides the high-frequency magnetic field generated by the energy transmitting coil to the magnetic circuit coupling array, the magnetic circuit coupling array receives the high-frequency magnetic field and allows the magnetic flux to pass through the energy receiving coil, and the two ends of the energy receiving coil are connected to the receiving end high-frequency rectification and power conversion circuit, which is used to rectify, stabilize and convert the alternating current generated by it.

[0008] In the wireless power transmission system for rotating shaft equipment provided by the present invention, it can also have the following characteristics: wherein, the magnetic circuit coupler is composed of one or more semicircular or U-shaped ferrite cores, the energy transmitting coil is longitudinally spirally wound close to the middle position of the magnetic circuit coupler, and the magnetic circuit coupling array is composed of a plurality of bar ferrite cores, which are evenly arranged and installed in a rotating array manner with the rotating shaft as the center.

[0009] The wireless power transmission system for rotating shaft equipment provided by the present invention may also have the following features: wherein, the wireless power transmission system for rotating shaft equipment also includes an installation barrel cover, the installation barrel cover is a hollow column structure, coaxial with the magnetic circuit coupling array, the inner wall of the installation barrel cover is affixed with electromagnetic shielding material, and the interior of the installation barrel cover is used to install load electrical equipment.

[0010] In the wireless power transmission system for rotating shaft equipment provided by the present invention, it can also have the following characteristics: wherein, the high-frequency resonant circuit at the transmitting end includes: a circuit power supply, having a first output end and a second output end; a first connection terminal and a second connection terminal, respectively connected to the first output end and the second output end, the first connection terminal and the second connection terminal are respectively used to connect the two ends of the external energy transmitting coil; and two power circuits, the output ends of the two power circuits are respectively connected to the first output end and the second output end, the output ends of the two power circuits are also respectively connected to the first connection terminal and the second connection terminal, the load ends of the two power circuits are respectively connected to the second connection terminal and the first connection terminal, two resonant capacitors are connected in parallel between the two load ends, and the two power circuits automatically adjust the output frequency according to the load and the coupling degree.

[0011] The wireless power transmission system for a rotating shaft device provided by the present invention may also have the following feature: a choke coil is provided between the output ends of the two power circuits and the first output end and the second output end, respectively.

[0012] In the wireless power transmission system for rotating shaft equipment provided by the present invention, it can also have the following characteristics: wherein, the power circuit includes: a main power MOS tube, which is an N-channel MOS tube, whose drain end is the output end, and whose source end is connected to the circuit reference potential; a protection circuit, including a protection resistor and a voltage regulator tube, and the protection resistor and the voltage regulator tube are both connected in parallel to the source and gate ends of the main power MOS tube; a current limiting resistor, one end of which is connected to the gate end of the main power MOS tube; and a limiting MOS tube, which is an N-channel MOS tube, whose source end is connected to the other end of the current limiting resistor, whose gate end is connected to a circuit auxiliary control power supply, and whose drain end is the load end, and two resonant capacitors are connected in parallel between the two lines whose drain ends of the two limiting MOS tubes are respectively connected to the first connection terminal and the second connection terminal.

[0013] In the wireless power transmission system for rotating shaft equipment provided by the present invention, it can also have the following characteristics: wherein, the power circuit also includes a filter circuit, the filter circuit includes a filter capacitor and a filter resistor, one end of the filter capacitor is connected to the circuit auxiliary control power supply, and the other end is connected to the source end of the main power MOS tube, one end of the filter resistor is connected to the gate end of the limiting MOS tube, and the other end is connected to the circuit reference potential.

[0014] In the wireless power transmission system for rotating shaft equipment provided by the present invention, it can also have the following characteristics: wherein, the start-stop control circuit of the transmitting end includes: an output circuit, whose output end is connected to a circuit power supply; a start control circuit, connected to the output circuit, for controlling the start of the circuit power supply; a stop control circuit, connected to the start control circuit, for controlling the opening and closing of the start control circuit to indirectly control the power off of the circuit power supply; and an indication circuit, having a running indicator light and a stop indicator light, both of which are connected to the start control circuit to respectively display the opening and closing states of the start control circuit and the stop control circuit.

[0015] The wireless power transmission system for rotating shaft equipment provided by the present invention may also have the following features: wherein the output circuit is a power solid-state relay, the power solid-state relay has a first load terminal, a second load terminal, a first control terminal and a second control terminal, the first load terminal is connected to a circuit power supply, the second load terminal is connected to an external supply voltage, the second control terminal is connected to a circuit reference potential, and when current flows between the first control terminal and the second control terminal, the first load terminal is electrically connected to the second load terminal, so that the supply voltage supplies power to the circuit power supply; starting The control circuit includes a first signal relay, a local start circuit and a remote start circuit. The first signal relay has a first electromagnet, a first static contact, a second static contact, a third static contact, a fourth static contact, a first moving contact and a second moving contact. One end of the first electromagnet is connected to the circuit reference potential and the two ends of the first electromagnet are connected in parallel with a first magnetic brake. The first moving contact is normally closed with the first static contact and normally open with the second static contact. The second moving contact is normally closed with the third static contact and normally open with the fourth static contact. The second moving contact is connected to the circuit auxiliary control power supply. The local start circuit and the remote start circuit are connected to the first signal relay. The moving circuit has a local start button and a remote start button that can be opened and closed, one end of each of the local start circuit and the remote start circuit is connected to the second static contact, and the other end is connected to the two static contacts of the conversion switch, and the moving contact of the conversion switch is connected to the other end of the first electromagnet and the first moving contact; the stop control circuit includes a second signal relay, a local stop circuit and a remote stop circuit, the second signal relay has a second electromagnet, a fifth static contact, a sixth static contact and a third moving contact, one end of the second electromagnet is connected to the circuit reference potential and the two ends of the second electromagnet are connected in parallel The second magnetic transistor and the fifth static contact are connected to the circuit auxiliary control power supply, the third moving contact is normally closed with the fifth static contact and normally open with the sixth static contact, the third moving contact is connected with the second static contact, the local stop circuit and the remote stop circuit have openable and closable local stop button and remote stop button respectively, one end of the local stop circuit and the remote stop circuit are respectively connected to the fifth static contact, and the other end is connected to the other end of the second electromagnet; one end of the running indicator light and the stop indicator light of the indication circuit are respectively connected to the fourth static contact and the third static contact, and the other end are connected to the circuit reference potential.

[0016] In the wireless power transmission system for rotating shaft equipment provided by the present invention, it can also have the following characteristics: wherein, the high-frequency rectification and power conversion circuit at the receiving end includes: a rectifier bridge, including two half-bridges, the negative pole of the rectifier bridge is connected to the circuit reference potential; a third connection terminal and a fourth connection terminal, respectively connected to the two half-bridges, and the connection point is located between the two diodes in the corresponding half-bridge, and the third connection terminal and the fourth connection terminal are respectively used to connect the two ends of the energy receiving coil; a first voltage stabilizing capacitor, one end of which is connected to the positive pole of the rectifier bridge, and the other end is connected to the negative pole of the rectifier bridge; a voltage stabilizing chip, model LM2596, whose input pin VIN is connected to the positive pole of the rectifier bridge, and whose ground pin GND1 and enable pin ON / OFF are both connected to the circuit reference potential; continued A current diode, whose cathode is connected to the output pin OUT of the voltage stabilizing chip, and whose anode is connected to the cathode of the rectifier bridge and the circuit reference potential; a switching inductor, one end of which is connected to the output pin OUT; a first feedback voltage-dividing resistor, one end of which is connected to the other end of the switching inductor; a second feedback voltage-dividing resistor, one end of which is connected to the other end of the first feedback voltage-dividing resistor, and the other end of which is connected to the circuit reference potential, and the line connecting the first feedback voltage-dividing resistor and the second feedback voltage-dividing resistor is connected to the feedback pin FB of the voltage stabilizing chip; a second voltage-stabilizing capacitor, which is connected in parallel to both ends of the first feedback voltage-dividing resistor and the second feedback voltage-dividing resistor, and whose anode is connected to the first feedback voltage-dividing resistor, and whose cathode is connected to the second feedback voltage-dividing resistor, and one end of the positive electrode of the second voltage-stabilizing capacitor is also connected to the circuit auxiliary control power supply.

[0017] Functions and Effects of the Invention

[0018] According to the present invention, a wireless power transmission system for a rotating shaft device includes: a magnetic circuit coupler fixed on the ground or installed on a stationary bracket; an energy transmitting coil wound on the magnetic circuit coupler; a transmitting end high-frequency resonant circuit connected to both ends of the energy transmitting coil, used to power the energy transmitting coil to generate a high-frequency magnetic field; a transmitting end start-stop control circuit connected to the transmitting end high-frequency resonant circuit, used to power the transmitting end high-frequency resonant circuit and control its opening and closing; a mounting bracket, which is a circular ring structure, and a plurality of mounting grooves are evenly opened on the outer circumference of the mounting bracket, and the rotating shaft can rotatably pass through the mounting bracket. The mounting bracket is passed through; the magnetic circuit coupling array is composed of a plurality of strip magnetic cores, which are correspondingly embedded in a plurality of mounting grooves; the energy receiving coil is wound around the outer periphery of the magnetic circuit coupling array, wherein the magnetic circuit coupler is installed opposite to the magnetic circuit coupling array, and the magnetic circuit coupler is installed on the side of the magnetic circuit coupling array, the magnetic circuit coupler guides the high-frequency magnetic field generated by the energy transmitting coil to the magnetic circuit coupling array, the magnetic circuit coupling array receives the high-frequency magnetic field and allows the magnetic flux to pass through the energy receiving coil, and the two ends of the energy receiving coil are connected to the receiving end high-frequency rectification and power conversion circuit, which is used to rectify, stabilize and convert the alternating current generated by it.

[0019] Therefore, the wireless power transmission system for rotating shaft equipment of the present invention has a simple structure and a small installation area, and is convenient for installation in a structure with limited space, such as a transmission shaft maintenance compartment, and can provide reliable power support for equipment such as torque detection that needs to be installed on the rotating shaft. The present invention provides an innovative solution for the application field of traditional rotating shaft power supply and has application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a mechanical component part of a wireless power transmission system for a rotating shaft device according to an embodiment of the present invention when it is installed on a rotating shaft;

[0021] Figure 2 It is a schematic diagram of the structure of a mechanical component part of a wireless power transmission system for a rotating shaft device without installing a barrel cover in an embodiment of the invention;

[0022] Figure 3 It is a circuit diagram of a transmitter start-stop control circuit of a circuit part of a wireless power transmission system for a rotating shaft device according to an embodiment of the present invention;

[0023] Figure 4 It is a circuit diagram of a transmitting end high frequency resonance circuit of a circuit part of a wireless power transmission system for a rotating shaft device according to an embodiment of the present invention;

[0024] Figure 5 The present invention is a circuit diagram of a high-frequency rectification and power conversion circuit at the receiving end of a circuit portion of a wireless power transmission system for a rotating shaft device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the following embodiments and the accompanying drawings specifically illustrate a wireless power transmission system for a rotating shaft device of the present invention.

[0026] <Example>

[0027] This embodiment provides a wireless power transmission system for a rotating shaft device, including a mechanical component part 100 and a circuit part 200 .

[0028] Figure 1 is a schematic structural diagram of a mechanical component part of a wireless power transmission system for a rotating shaft device according to an embodiment of the present invention when it is installed on a rotating shaft; Figure 2 It is a structural schematic diagram of a mechanical component part of a wireless power transmission system for a rotating shaft device according to an embodiment of the invention, excluding a barrel cover.

[0029] like Figure 1 and Figure 2As shown, the mechanical component part 100 of the wireless power transmission system for rotating shaft equipment in this embodiment includes a magnetic circuit coupler 10, an energy transmitting coil 20, a mounting bracket 30, a magnetic circuit coupling array 40, an energy receiving coil 50 and a mounting barrel cover 60.

[0030] The magnetic circuit coupler 10 is composed of one or more semicircular or U-shaped ferrite cores, fixed on the ground or installed on a stationary support.

[0031] The energy transmitting coil 20 is closely attached to the middle position of the magnetic circuit coupler 10 and is longitudinally spirally wound.

[0032] The mounting bracket 30 is a circular ring structure. A plurality of mounting grooves (not shown in the figure) are evenly formed around the outer circumference of the mounting bracket 30 . The rotating shaft 1 is rotatably disposed through the mounting bracket 30 .

[0033] The magnetic circuit coupling array 40 is composed of a plurality of bar ferrite cores, which are evenly arranged and installed in a rotating array with the rotating shaft 1 as the center and embedded in a plurality of installation slots. The magnetic circuit coupler 10 is installed opposite to the magnetic circuit coupling array 40, and the magnetic circuit coupler 10 is installed on the side of the magnetic circuit coupling array 40.

[0034] The energy receiving coil 50 is wound around the outer periphery of the magnetic circuit coupling array 40 .

[0035] The installation barrel cover 60 is a hollow column structure, which is coaxial with the magnetic circuit coupling array 40. The inner wall of the installation barrel cover 60 is affixed with electromagnetic shielding material. The interior of the installation barrel cover 60 in this embodiment is used to install load electrical equipment (not shown in the figure).

[0036] The circuit part 200 of the wireless power transmission system for rotating shaft equipment in this embodiment includes a transmitter start-stop control circuit 70 , a transmitter high-frequency resonance circuit 80 , and a receiver high-frequency rectification and power conversion circuit 90 .

[0037] Figure 3 The invention is a circuit diagram of a transmitter start-stop control circuit of a circuit part of a wireless power transmission system for a rotating shaft device according to an embodiment of the present invention.

[0038] like Figure 3 As shown, the transmitter start-stop control circuit 70 in this embodiment includes an output circuit 71 , a start control circuit 72 , a stop control circuit 73 and an indication circuit 74 .

[0039] The output circuit 71 is a power solid-state relay having a first load terminal 71 a , a second load terminal 71 b , a first control terminal 71 c , and a second control terminal 71 d .

[0040] The first load terminal 71a is connected to the circuit power supply PWR, the second load terminal 71b is connected to the external supply voltage VCC, and the second control terminal 71d is connected to the circuit reference potential GND. When current flows between the first control terminal 71c and the second control terminal 71d, the first load terminal 71a is electrically connected to the second load terminal 71b, so that the supply voltage VCC supplies power to the circuit power supply PWR.

[0041] The starting control circuit 72 includes a first signal relay K1 , a local starting circuit 721 and a remote starting circuit 722 .

[0042] The first signal relay K1 has a first electromagnet YA1, a first stationary contact d1, a second stationary contact d2, a third stationary contact d3, a fourth stationary contact d4, a first moving contact d5 and a second moving contact d6.

[0043] One end of the first electromagnet YA1 is connected to the circuit reference potential GND and the two ends of the first electromagnet YA1 are connected in parallel with the first magnetic gate D1. The first moving contact d5 is normally closed with the first static contact d1 and is normally open with the second static contact d2. The second moving contact d6 is normally closed with the third static contact d3 and is normally open with the fourth static contact d4. The second moving contact d6 is connected to the circuit auxiliary control power supply V ctrl connect.

[0044] The local start circuit 721 and the remote start circuit 722 respectively have a local start button S1 and a remote start button S2 that can be opened and closed. One end of the local start circuit 721 and the remote start circuit 722 are connected to the second static contact d2, and the other end is connected to the two static contacts of the conversion switch S3. The moving contact of the conversion switch S3 is connected to the other end of the first electromagnet YA1 and the first moving contact d5.

[0045] The stop control circuit 73 includes a second signal relay K2, a local stop circuit 731 and a remote stop circuit 732.

[0046] The second signal relay K2 has a second electromagnet YA2, a fifth stationary contact d7, a sixth stationary contact d8 and a third moving contact d9.

[0047] One end of the second electromagnet YA2 is connected to the circuit reference potential GND and the two ends of the second electromagnet YA2 are connected in parallel with the second magnetic brake D2. The fifth static contact d7 is connected to the circuit auxiliary control power supply V ctrl The third moving contact d9 is normally closed with the fifth static contact d7 and normally open with the sixth static contact d8, and the third moving contact d9 is connected to the second static contact d2.

[0048] The local stop circuit 731 and the remote stop circuit 732 respectively have an openable and closable local stop button S4 and a remote stop button S5. One end of the local stop circuit 731 and the remote stop circuit 732 are connected to the fifth static contact d7, and the other end is connected to the other end of the second electromagnet YA2.

[0049] The indicating circuit 74 includes a first resistor R1, a second resistor R2, an operation indicator light LED1, a third resistor R3, a fourth resistor R4 and a stop indicator light LED2.

[0050] The third static contact d3 is connected in series with the first resistor R1, the second resistor R2, the operation indicator LED1 and the circuit reference potential GND in sequence, so that the operation indicator LED1 is used to indicate whether the local start button S1 and / or the remote start button S2 are closed.

[0051] The fourth static contact d4 is connected in series with the third resistor R3, the fourth resistor R4, the stop indicator LED2 and the circuit reference potential GND in sequence, so that the stop indicator LED2 is used to indicate whether the local stop button S4 and / or the remote stop button S5 are closed.

[0052] Figure 4 The present invention is a circuit diagram of a transmitting-end high-frequency resonance circuit of a circuit portion of a wireless power transmission system for a rotating shaft device according to an embodiment of the present invention.

[0053] like Figure 4 As shown, the transmitting end high frequency resonant circuit 80 in this embodiment includes a circuit power supply PWR, a first connection terminal X1, a second connection terminal X2, a first power loop 81 and a second power loop 82.

[0054] The circuit power supply PWR has a first output terminal V1 and a second output terminal V2.

[0055] The first connection terminal X1 and the second connection terminal X2 are connected to the first output terminal V1 and the second output terminal V2 respectively. The first connection terminal X1 and the second connection terminal X2 are used to connect two ends of the energy transmitting coil 20 respectively.

[0056] The first power circuit 81 includes a first main power MOS transistor (denoted as MOS1), a first protection circuit GDT1, a first current limiting resistor R5, a first amplitude limiting MOS transistor (denoted as MOS2) and a first filter circuit RC1.

[0057] MOS1 is an N-channel MOS transistor, a drain terminal of which is connected to the first connection terminal X1 and is connected in series to the first output terminal V1 via the first choke coil L1 , and a source terminal of which is connected to the circuit reference potential GND.

[0058] The first protection circuit GDT1 includes a first protection resistor R6 and a first voltage regulator D3. The first protection resistor R6 and the first voltage regulator D3 are connected in parallel to the source and gate of the MOS1.

[0059] One end of the first current limiting resistor R5 is connected to the gate terminal of MOS1.

[0060] MOS2 is an N-channel MOS tube, whose source terminal is connected to the other end of the first current limiting resistor R5, and whose gate terminal is connected to the circuit auxiliary control power supply V ctrl , and its drain terminal is connected to the second connection terminal X2.

[0061] The first filter circuit RC1 includes a first filter capacitor C1 and a first filter resistor R7. One end of the first filter capacitor C1 is connected to the circuit auxiliary control power supply V ctrl , and the other end is connected to the source end of MOS1; one end of the first filter resistor R7 is connected to the gate end of MOS2, and the other end is connected to the circuit reference potential GND.

[0062] The second power circuit 82 includes a second main power MOS tube (denoted as MOS3), a second protection circuit GDT2, a second current limiting resistor R8, a second limiting MOS tube (denoted as MOS4) and a second filter circuit RC2; the second protection circuit GDT2 includes a second protection resistor R9 and a second voltage regulator tube D4; the second filter circuit RC2 includes a second filter capacitor C2 and a second filter resistor R10.

[0063] The drain terminal of the MOS 3 is connected to the second connection terminal X2 and is connected in series to the second output terminal V2 via the second choke coil L2 , and the source terminal thereof is connected to the circuit reference potential GND.

[0064] The connection relationship between the remaining circuits and components in the second power circuit 82 is similar to that of the first power circuit 81 and will not be repeated.

[0065] In the connection circuits of the first power loop 81 and the second power loop 82 , the first resonant capacitor C3 and the second resonant capacitor C4 are connected in parallel between the line connecting the drain end of MOS2 to the second connection terminal X2 and the line connecting the drain end of MOS4 to the first connection terminal X1 .

[0066] Figure 5 The present invention is a circuit diagram of a high-frequency rectification and power conversion circuit at the receiving end of a circuit portion of a wireless power transmission system for a rotating shaft device according to an embodiment of the present invention.

[0067] like Figure 5 As shown, the receiving end high frequency rectification and power conversion circuit 90 of this embodiment includes a third connection terminal X3, a fourth connection terminal X4, a rectifier bridge BR and a Buck voltage stabilization circuit 91.

[0068] The third connection terminal X3 and the fourth connection terminal X4 are respectively connected to two ends of the energy receiving coil 50 .

[0069] The two half bridges of the rectifier bridge BR are respectively connected to the third connection terminal X3 and the fourth connection terminal X4 to convert the alternating current generated by the energy receiving coil 50 receiving the magnetic flux into direct current. The negative pole of the rectifier bridge BR is connected to the circuit reference potential GND.

[0070] The Buck voltage stabilizing circuit 91 includes a first voltage stabilizing capacitor C5, a voltage stabilizing chip U, a freewheeling diode D5, a switching inductor L4, a first feedback voltage dividing resistor R11, a second feedback voltage dividing resistor R12 and a second voltage stabilizing capacitor C6.

[0071] One end of the first voltage stabilizing capacitor C5 is connected to the positive electrode of the rectifier bridge BR, and the other end is connected to the negative electrode of the rectifier bridge BR.

[0072] The model of the voltage regulator chip U is LM2596HV, its input pin VIN is connected to the positive pole of the rectifier bridge BR, and its ground pin GND1 and enable pin ON / OFF are both connected to the circuit reference potential GND.

[0073] The cathode of the freewheeling diode D5 is connected to the output pin OUT of the voltage stabilizing chip U, and the anode thereof is connected to the cathode of the rectifier bridge BR and the circuit reference potential GND.

[0074] One end of the switching inductor L4 is connected to the output pin OUT.

[0075] One end of the first feedback voltage-dividing resistor R11 is connected to the other end of the switch inductor L4 .

[0076] One end of the second feedback voltage-dividing resistor R12 is connected to the other end of the first feedback voltage-dividing resistor R11, the other end of the second feedback voltage-dividing resistor R12 is connected to the circuit reference potential GND, and the line connecting the first feedback voltage-dividing resistor R11 and the second feedback voltage-dividing resistor R12 is connected to the feedback pin FB of the voltage stabilizing chip U.

[0077] The second voltage stabilizing capacitor C6 is connected in parallel to both ends of the first feedback voltage dividing resistor R11 and the second feedback voltage dividing resistor R12, and its positive electrode is connected to the first feedback voltage dividing resistor R11, and its negative electrode is connected to the second feedback voltage dividing resistor R12. The positive electrode of the second voltage stabilizing capacitor C6 is also connected to the circuit auxiliary control power supply V ctrl connect.

[0078] The operation process of the wireless power transmission system for rotating shaft equipment in this embodiment:

[0079] S01, press the local start button S1 or the remote start button S2, the first signal relay K1 is energized, and maintains the energized state through its own auxiliary contact. At this time, the power solid-state relay of the output circuit 71 works, so that the first load terminal 71a is electrically connected to the second load terminal 71b, so that the supply voltage VCC supplies power to the circuit power supply PWR.

[0080] S02, the circuit power supply PWR voltage is transmitted to the drain of MOS2 and MOS4 through L1 and L2. MOS2 and MOS4 work in the depletion region when limiting, and their gate voltage is always within the control voltage range of 12V to 15V. Therefore, their source output voltage will be limited to V ctrl -V gsth , in this circuit it is about 10V.

[0081] After being limited, the voltage of the circuit power supply PWR drives MOS1 or MOS3 through the first current limiting resistor R5 or the second current limiting resistor R8. Due to the natural differences between components, one of the power tubes will be turned on first.

[0082] Assuming that MOS1 is turned on first, its drain level will be pulled down, and the gate level of the opposite power tube MOS2 will also be pulled down, and MOS3 will be turned off; when the power loop LC sine oscillates, the drain level of MOS3 has a zero crossing point; when it crosses zero, the gate level of MOS1 will be pulled down, and the drain level of MOS1 will be pulled up, causing MOS3 to turn on. This cycle repeats, and the main power tubes MOS1 and MOS3 are responsible for the conduction of the positive and negative half cycles of the LC sinusoidal oscillation respectively. Their switching frequency is equal to the LC oscillation frequency, and will change in real time with the change of the resonance parameters.

[0083] S03, the first connection terminal X1 and the second connection terminal X2 are respectively connected to the two ends of the energy transmitting coil 20. The magnetic circuit coupler 10 guides the high-frequency magnetic field generated by the energy transmitting coil 20 to the magnetic circuit coupling array 40, and the magnetic circuit coupling array 40 receives the high-frequency magnetic field and allows the magnetic flux to pass through the energy receiving coil 50. The energy receiving coil 50 receives the influence of the magnetic flux and thus supplies power to the load electrical equipment connected to the rotating shaft 1 inside the installation barrel cover 60.

[0084] S04, due to the vibration during the rotation process, the relative position of the coil and other factors, the output voltage of the electromagnetic coupler is not stable, and it is necessary to stabilize the voltage when connecting to the subsequent load. When powering, the two ends of the energy receiving coil 50 are connected to the third connection terminal X3 and the fourth connection terminal X4, and Figure 5 The rectifier circuit and Buck voltage regulator circuit shown rectify current, stabilize voltage and adjust power.

[0085] Functions and Effects of the Embodiments

[0086] The present embodiment provides a wireless power transmission system for a rotating shaft device, which includes: a magnetic circuit coupler fixed on the ground or installed on a stationary bracket; an energy transmitting coil wound on the magnetic circuit coupler; a transmitting end high-frequency resonant circuit connected to both ends of the energy transmitting coil, used to power the energy transmitting coil to generate a high-frequency magnetic field; a transmitting end start-stop control circuit connected to the transmitting end high-frequency resonant circuit, used to power the transmitting end high-frequency resonant circuit and control its opening and closing; a mounting bracket, which is a circular ring structure, and a plurality of mounting grooves are evenly opened on the outer circumference of the mounting bracket, and the rotating shaft can rotatably pass through the mounting bracket. A mounting bracket; a magnetic circuit coupling array, composed of a plurality of strip-shaped magnetic cores, which are correspondingly embedded in a plurality of mounting grooves; an energy receiving coil, which is wound around the outer periphery of the magnetic circuit coupling array, wherein a magnetic circuit coupler is installed opposite to the magnetic circuit coupling array, and the magnetic circuit coupler is installed on the side of the magnetic circuit coupling array, the magnetic circuit coupler guides the high-frequency magnetic field generated by the energy transmitting coil to the magnetic circuit coupling array, the magnetic circuit coupling array receives the high-frequency magnetic field and allows the magnetic flux to pass through the energy receiving coil, and both ends of the energy receiving coil are connected to a receiving-end high-frequency rectification and power conversion circuit for rectifying, stabilizing and converting the alternating current generated by the energy receiving coil.

[0087] Therefore, the wireless power transmission system for rotating shaft equipment of this embodiment has a simple structure and a small installation area, and is convenient to be installed in a structure with limited space, such as a transmission shaft maintenance compartment, and can provide reliable power support for equipment such as torque detection that needs to be installed on a rotating shaft, and can provide stable and efficient power supply for rotating equipment. This embodiment provides an innovative solution for the application field of traditional rotating shaft power supply, and has application potential.

[0088] Furthermore, the wireless power transmission system for rotating shaft equipment also includes an installation barrel cover, which is a hollow column structure coaxial with the magnetic circuit coupling array, the inner wall of the installation barrel cover is affixed with electromagnetic shielding material, and the interior of the installation barrel cover is used to install load electrical equipment.

[0089] Such a setting can play a role of fixing and protecting, and can prevent the magnetic field of the power supply equipment from interfering with the normal operation of the load equipment.

[0090] Furthermore, the transmitting end high frequency resonant circuit includes: a circuit power supply, having a first output end and a second output end; a first connection terminal and a second connection terminal, respectively connected to the first output end and the second output end, the first connection terminal and the second connection terminal are respectively used to connect the two ends of the external energy transmitting coil; and two power circuits, the output ends of the two power circuits are respectively connected to the first output end and the second output end, the output ends of the two power circuits are also respectively connected to the first connection terminal and the second connection terminal, the load ends of the two power circuits are respectively connected to the second connection terminal and the first connection terminal, two resonant capacitors are connected in parallel between the two load ends, and the two power circuits automatically adjust the output frequency according to the load and coupling degree. A choke coil is also arranged between the output ends of the two power circuits and the first output end and the second output end. The power circuit includes: a main power MOS tube, which is an N-channel MOS tube, whose drain end is the output end, and whose source end is connected to the circuit reference potential; a protection circuit, including a protection resistor and a voltage regulator tube, both of which are connected in parallel to the source and gate ends of the main power MOS tube; a current limiting resistor, one end of which is connected to the gate end of the main power MOS tube; and a limiting MOS tube, which is an N-channel MOS tube, whose source end is connected to the other end of the current limiting resistor, whose gate end is connected to the circuit auxiliary control power supply, and whose drain end is the load end, and two resonant capacitors are connected in parallel between the two lines whose drain ends of the two limiting MOS tubes are respectively connected to the first connection terminal and the second connection terminal. The power circuit also includes a filter circuit, which includes a filter capacitor and a filter resistor, one end of the filter capacitor is connected to the circuit auxiliary control power supply, and the other end is connected to the source end of the main power MOS tube, one end of the filter resistor is connected to the gate end of the limiting MOS tube, and the other end is connected to the circuit reference potential.

[0091] In this way, the energy transmitting coil is used as a resonant inductor, and is connected in parallel with the resonant capacitor to form an LC resonant cavity, generating a high-frequency AC current in the energy transmitting coil. The self-excited resonance principle is adopted, and the output frequency can be automatically adjusted according to the load and coupling degree. In the case of vibration of the rotating shaft, high-frequency sinusoidal output can also be achieved, achieving a higher transmission efficiency.

[0092] Furthermore, the start-stop control circuit of the transmitting end includes: an output circuit, whose output end is connected to a circuit power supply; a start control circuit, connected to the output circuit, and used to control the start of the circuit power supply; a stop control circuit, connected to the start control circuit, and used to control the opening and closing of the start control circuit to indirectly control the power off of the circuit power supply; and an indication circuit, having a running indicator light and a stop indicator light, both of which are connected to the start control circuit to respectively display the opening and closing states of the start control circuit and the stop control circuit. The output circuit is a power solid-state relay, which has a first load end, a second load end, a first control end and a second control end. The first load end is connected to a circuit power supply, the second load end is connected to an external supply voltage, and the second control end is connected to a circuit reference potential. When current flows between the first control end and the second control end, the first load end is electrically connected to the second load end, so that the supply voltage supplies power to the circuit power supply; the start control circuit includes a first signal relay, a local start circuit and a remote start circuit. The first signal relay has a first electromagnet, a first static contact, a second static contact, a third static contact, a fourth static contact, a first moving contact and a second moving contact. One end of the first electromagnet is connected to the circuit reference potential and the first magnetic transistor is connected in parallel to both ends of the first electromagnet. The first moving contact is normally closed with the first static contact and normally open with the second static contact, the second moving contact is normally closed with the third static contact and normally open with the fourth static contact, and the second moving contact is connected to the circuit auxiliary control power supply. The local start circuit and the remote start circuit respectively have a local start button and a remote start button that can be opened and closed. The local start button and the remote start circuit each have one end connected to the second static contact, and the other end connected to the two static contacts of the conversion switch, and the moving contact of the conversion switch is connected to the other end of the first electromagnet and the first moving contact; the stop control circuit includes a second signal relay, a local stop circuit and a remote stop circuit, the second signal relay has a second electromagnet, a fifth static contact, a sixth static contact and a third moving contact, one end of the second electromagnet is connected to the circuit reference potential and the two ends of the second electromagnet are connected in parallel with the second magnetic transistor, the fifth static contact is connected to the circuit auxiliary control power supply, the third moving contact is normally closed with the fifth static contact and normally open with the sixth static contact, the third moving contact is connected with the second static contact, the local stop circuit and the remote stop circuit respectively have a local stop button and a remote stop button that can be opened and closed, one end of the local stop circuit and the remote stop circuit each have one end connected to the fifth static contact, and the other end is connected to the other end of the second electromagnet; one end of the running indicator light and the stop indicator light of the indication circuit are respectively connected to the fourth static contact and the third static contact, and the other end is connected to the circuit reference potential.

[0093] Furthermore, the receiving end high-frequency rectification and power conversion circuit includes: a rectifier bridge, including two half-bridges, the negative pole of the rectifier bridge is connected to the circuit reference potential; a third connection terminal and a fourth connection terminal are respectively connected to the two half-bridges, and the connection point is located between the two diodes in the corresponding half-bridge, and the third connection terminal and the fourth connection terminal are respectively used to connect the two ends of the energy receiving coil; a first voltage stabilizing capacitor, one end of which is connected to the positive pole of the rectifier bridge, and the other end is connected to the negative pole of the rectifier bridge; a voltage stabilizing chip, model LM2596, whose input pin VIN is connected to the positive pole of the rectifier bridge, and its ground pin GND1 and enable pin ON / OFF are both connected to the circuit reference potential; a freewheeling diode, whose cathode is connected to the output pin of the voltage stabilizing chip The first feedback voltage-dividing resistor is connected to the OUT pin, and its positive electrode is connected to the negative electrode of the rectifier bridge and the circuit reference potential; the switching inductor, one end of which is connected to the output pin OUT; the first feedback voltage-dividing resistor, one end of which is connected to the other end of the switching inductor; the second feedback voltage-dividing resistor, one end of which is connected to the other end of the first feedback voltage-dividing resistor, and the other end of which is connected to the circuit reference potential, and the line connecting the first feedback voltage-dividing resistor and the second feedback voltage-dividing resistor is connected to the feedback pin FB of the voltage-stabilizing chip; the second voltage-stabilizing capacitor is connected in parallel to both ends of the first feedback voltage-dividing resistor and the second feedback voltage-dividing resistor, and its positive electrode is connected to the first feedback voltage-dividing resistor, and its negative electrode is connected to the second feedback voltage-dividing resistor, and one end of the positive electrode of the second voltage-stabilizing capacitor is also connected to the circuit auxiliary control power supply.

[0094] In the above settings, the diode used in the high-frequency rectification and power conversion circuit at the receiving end is a Schottky diode, which has a lower conduction voltage drop and a shorter reverse recovery time than ordinary diodes to meet the high-frequency working conditions. The power conversion circuit is used to convert the DC power output by the high-frequency rectification circuit, stabilize the output voltage, and play the role of load impedance conversion.

[0095] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wireless power transmission system for a rotating shaft device, characterized in that: include: A magnetic circuit coupler, fixed to the ground or mounted on a stationary support; An energy transmitting coil, wound on the magnetic circuit coupler; A transmitting end high frequency resonant circuit, connected to both ends of the energy transmitting coil, for supplying power to the energy transmitting coil to generate a high frequency magnetic field; A transmitter start-stop control circuit is connected to the transmitter high-frequency resonant circuit and is used to supply power to the transmitter high-frequency resonant circuit and control its opening and closing; The mounting bracket is a circular ring structure, and a plurality of mounting grooves are evenly arranged around the outer circumference of the mounting bracket, and the rotating shaft can rotatably pass through the mounting bracket; A magnetic circuit coupling array, composed of a plurality of strip-shaped magnetic cores, correspondingly embedded in the plurality of mounting slots; The energy receiving coil is wound around the outer periphery of the magnetic circuit coupling array. The magnetic circuit coupler is installed opposite to the magnetic circuit coupling array and is installed on the side of the magnetic circuit coupling array. The magnetic circuit coupler guides the high-frequency magnetic field generated by the energy transmitting coil to the magnetic circuit coupling array. The magnetic circuit coupling array receives the high-frequency magnetic field and allows the magnetic flux to pass through the energy receiving coil. The two ends of the energy receiving coil are connected to a receiving end high frequency rectification and power conversion circuit for rectifying, stabilizing and converting the alternating current generated by the energy receiving coil.

2. The wireless power transmission system for a rotating shaft device according to claim 1, characterized in that: in, The magnetic circuit coupler is composed of one or more semicircular or U-shaped ferrite cores. The energy transmitting coil is closely attached to the middle position of the magnetic circuit coupler and is longitudinally spirally wound. The magnetic circuit coupling array is composed of a plurality of bar-shaped ferrite cores, which are evenly arranged and installed in a rotating array manner with the rotating axis as the center.

3. The wireless power transmission system for a rotating shaft device according to claim 1, characterized in that: in, The wireless power transmission system for rotating shaft equipment also includes a mounting barrel cover, The installation barrel cover is a hollow column structure, coaxial with the magnetic circuit coupling array, and the inner wall of the installation barrel cover is affixed with electromagnetic shielding material. The interior of the installation barrel cover is used for installing load electrical equipment.

4. The wireless power transmission system for a rotating shaft device according to claim 1, Features: in, The transmitting end high frequency resonant circuit comprises: A circuit power supply having a first output terminal and a second output terminal; A first connection terminal and a second connection terminal, connected to the first output end and the second output end respectively, the first connection terminal and the second connection terminal are respectively used to externally connect two ends of the energy transmitting coil; and There are two power circuits, wherein the output ends of the two power circuits are respectively connected to the first output end and the second output end, and the output ends of the two power circuits are also respectively connected to the first connection terminal and the second connection terminal, and the load ends of the two power circuits are respectively connected to the second connection terminal and the first connection terminal, and two resonant capacitors are connected in parallel between the two load ends. The two power circuits automatically adjust the output frequency according to the load and the coupling degree.

5. The wireless power transmission system for a rotating shaft device according to claim 4, characterized in that: in, A choke coil is also provided between the output end of each of the two power circuits and the first output end and the second output end.

6. The wireless power transmission system for a rotating shaft device according to claim 4, Features: in, The power circuit comprises: The main power MOS tube is an N-channel MOS tube, the drain terminal of which is the output terminal, and the source terminal of which is connected to the circuit reference potential; A protection circuit, comprising a protection resistor and a voltage regulator tube, wherein the protection resistor and the voltage regulator tube are connected in parallel to the source and the gate of the main power MOS tube; a current limiting resistor, one end of which is connected to the gate terminal of the main power MOS tube; and The limiting MOS tube is an N-channel MOS tube, whose source terminal is connected to the other end of the current limiting resistor, whose gate terminal is connected to the circuit auxiliary control power supply, and whose drain terminal is the load terminal. The drain terminals of the two limiting MOS tubes are respectively connected to the first connection terminal and the second connection terminal, and the two resonant capacitors are connected in parallel between the two lines.

7. The wireless power transmission system for a rotating shaft device according to claim 6, characterized in that: in, The power circuit also includes a filter circuit, The filter circuit includes a filter capacitor and a filter resistor. One end of the filter capacitor is connected to the circuit auxiliary control power supply, and the other end is connected to the source end of the main power MOS tube. One end of the filter resistor is connected to the gate end of the limiting MOS tube, and the other end is connected to the circuit reference potential.

8. The wireless power transmission system for a rotating shaft device according to claim 4, Features: in, The transmitter start-stop control circuit comprises: An output circuit, an output end of which is connected to the circuit power supply; A startup control circuit connected to the output circuit and used to control the start of the power supply of the circuit; a stop control circuit, connected to the start control circuit, for controlling the opening and closing of the start control circuit, thereby indirectly controlling the power supply of the circuit to be cut off; and The indicating circuit has a running indicating light and a stopping indicating light, both of which are connected to the starting control circuit to respectively display the opening and closing states of the starting control circuit and the stopping control circuit.

9. The wireless power transmission system for a rotating shaft device according to claim 8, characterized in that: in, The output circuit is a power solid-state relay, and the power solid-state relay has a first load terminal, a second load terminal, a first control terminal and a second control terminal. The first load terminal is connected to the circuit power supply, the second load terminal is connected to an external supply voltage, and the second control terminal is connected to a circuit reference potential. When current flows between the first control terminal and the second control terminal, the first load terminal is electrically connected to the second load terminal, so that the supply voltage supplies power to the circuit power supply; The start control circuit includes a first signal relay, a local start circuit and a remote start circuit. The first signal relay comprises a first electromagnet, a first static contact, a second static contact, a third static contact, a fourth static contact, a first moving contact and a second moving contact. One end of the first electromagnet is connected to the circuit reference potential and the two ends of the first electromagnet are connected in parallel with the first magnetic transistor, the first moving contact is normally closed with the first static contact and normally open with the second static contact, the second moving contact is normally closed with the third static contact and normally open with the fourth static contact, and the second moving contact is connected to the circuit auxiliary control power supply, The local start circuit and the remote start circuit respectively have a local start button and a remote start button that can be opened and closed, one end of each of the local start circuit and the remote start circuit is connected to the second static contact, and the other end is connected to the two static contacts of the conversion switch, and the moving contact of the conversion switch is connected to the other end of the first electromagnet and the first moving contact; The stop control circuit includes a second signal relay, a local stop circuit and a remote stop circuit. The second signal relay has a second electromagnet, a fifth static contact, a sixth static contact and a third moving contact. One end of the second electromagnet is connected to the circuit reference potential and two ends of the second electromagnet are connected in parallel with a second magnetic transistor, the fifth static contact is connected to the circuit auxiliary control power supply, the third moving contact is normally closed with the fifth static contact and normally open with the sixth static contact, and the third moving contact is connected with the second static contact, The local stop circuit and the remote stop circuit respectively have a local stop button and a remote stop button that can be opened and closed, and one end of each of the local stop circuit and the remote stop circuit is connected to the fifth static contact, and the other end is connected to the other end of the second electromagnet; One end of the running indicator light and the stop indicator light of the indicating circuit are connected to the fourth static contact and the third static contact respectively, and the other end are connected to the circuit reference potential.

10. The wireless power transmission system for a rotating shaft device according to claim 4, Features: in, The receiving end high frequency rectification and power conversion circuit comprises: A rectifier bridge, comprising two half-bridges, wherein the cathode of the rectifier bridge is connected to a circuit reference potential; A third connection terminal and a fourth connection terminal are respectively connected to the two half bridges, and a connection point is located between two diodes in the corresponding half bridges, and the third connection terminal and the fourth connection terminal are respectively used to connect two ends of the energy receiving coil; A first voltage stabilizing capacitor, one end of which is connected to the positive electrode of the rectifier bridge, and the other end of which is connected to the negative electrode of the rectifier bridge; A voltage stabilizing chip, model LM2596, whose input pin VIN is connected to the positive electrode of the rectifier bridge, and whose ground pin GND1 and enable pin ON / OFF are both connected to the circuit reference potential; A freewheeling diode, the cathode of which is connected to the output pin OUT of the voltage stabilizing chip, and the anode of which is connected to the cathode of the rectifier bridge and a circuit reference potential; A switching inductor, one end of which is connected to the output pin OUT; A first feedback voltage-dividing resistor, one end of which is connected to the other end of the switching inductor; a second feedback voltage-dividing resistor, one end of which is connected to the other end of the first feedback voltage-dividing resistor, and the other end of which is connected to a circuit reference potential, and a line connecting the first feedback voltage-dividing resistor and the second feedback voltage-dividing resistor is connected to a feedback pin FB of the voltage stabilizing chip; A second voltage stabilizing capacitor is connected in parallel to both ends of the first feedback voltage dividing resistor and the second feedback voltage dividing resistor, and its positive electrode is connected to the first feedback voltage dividing resistor, and its negative electrode is connected to the second feedback voltage dividing resistor, One end of the positive electrode of the second voltage stabilizing capacitor is also connected to the circuit auxiliary control power supply.

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