Abstract: An antenna-based modular power system includes a prime power supply configured to generate a first alternating current (AC) power signal having a first AC voltage level. At least one transformer is configured to convert the first AC signal into a second AC signal having a second AC voltage level less than the first AC voltage level. At least one Transmit or Receive Integrated Microwave Module (T/RIMM) dual power converter antenna array is in signal communication with the at least one transformer. The at least one T/RIMM dual power converter antenna array includes at least one load, and an AC/DC converter is embedded therein to convert the second AC signal into a DC power drive signal to energize the at least one load.

Abstract: A power generation system (200) comprises a photovoltaic device (201) and a voltage source (202). The voltage source (202) is arranged to raise the bias voltage across the photovoltaic device (201), thereby increasing the power output of the power generation system (200).

Abstract: Aspects of non-linear droop control are described herein. In one embodiment, a system includes a first power converter or source configured to provide power to a bus, a second power converter or source configured to provide power to the bus, and a load electrically coupled to the bus. The system also includes a controller configured to adjust a droop resistance associated with the first power source according to a continuous non-linear function based on an amount of current supplied to the load by the first power source. The system can also include a second controller configured to adjust a droop resistance associated with the second power source according to the continuous non-linear function (or another continuous non-linear function). The use of the continuous non-linear functions achieves tighter voltage regulation particularly at lower loads and better load sharing at higher loads.

Abstract: A data center operable using only electric power based on renewable energy. The data center includes at least one device driven by the electric power, a storage battery for storing the electric power, and a controller for switching the operating mode of the device over the course of time on the basis of predicted values for the amount of electric power generated using renewable energy, the amount of electric power stored in the storage battery, and the amount of electric power consumed by the device.

Abstract: Approaches for controlling power supplied to an electric grid are disclosed. In embodiments, methods and systems control power supplied to an electric grid using an energy storage device. In an embodiment, a method receives an indication of power to be supplied to the electric grid, generates power from a power generator and adjusts, using the generated power, an energy level of the energy storage device to control power supplied to the grid in accordance with the received indication. In another embodiment, a system comprises a grid indication receiver for receiving an indication of power to be supplied to the electric grid; a power generator connected to the grid; an energy storage device coupled to the power generator; and a controller for adjusting, using the generated power from the generator, an energy level of the energy storage device to control power supplied to the grid in accordance with the received indication.

Abstract: The disclosed embodiments relate to wind and hydropower vessel plant configured for generating renewable electrical energy and for the production of oxygen, methane, salt, hydrogen, supplemental energy, and desalination. The wind and hydropower vessel plant comprises a hybrid apparatus relating to exposable turbine, submersible turbine, and thermal turbine configuration. The turbines are incorporated in a system comprising a platform for producing renewable energy that is storable and/or transportable. The disclosed embodiments further include vessel for gathering natural energy available in or on the oceans wherein said vessel is disposed with means for converting heat energy, and wherein said means further comprise heat pumps comprising heat exchanger arranged for extracting the heat off the seawater to produce usable energy and other source of fuels.

Abstract: The invention provides a power supply device, which is capable of properly supplying the power even if the power is supplied to the power receiving devices having a number exceeding the number that the communication part is capable of simultaneously communicating with. The power supplying device includes: a power supply part, capable of supplying a power to a plurality of external devices; a communication part, capable of communicating with the external devices; and a controller, disconnecting one or more of the external devices based on a power supplied information of the external devices being in a predetermined range in a case that a number of requests for a communication from the external devices exceeds a number that the communication part is capable of communicating with at the same time.

Abstract: A reverse power supply management method, apparatus and system are disclosed. The method includes: acquiring reverse power supply information of terminal devices of various links during a process that various terminal devices connected to a local end device stably perform reverse power supply on the local end device; determining reverse power supply management information of the various terminal devices according to the acquired reverse power supply information of the terminal devices of the various links; and transmitting respectively the reverse power supply management information of the various terminal devices to corresponding terminal devices to instruct the various terminal devices to adjust parameters for supplying reverse power to the local end device according to the received reverse power supply management information.

Abstract: Systems and techniques are provided for performance adjustment for wireless power transfer devices. A wireless power transfer device may be activated. A characteristic of the performance of the activated wireless power transfer device may be measured. It may be determined that the measured characteristic of the activated wireless power transfer device does not meet a performance requirement for the wireless power transfer device. An adjustment to be applied to the wireless power transfer device may be determined. The adjustment may be based on determining that the measured characteristic of the activated wireless power transfer device does not meet the performance requirement for the wireless power transfer device. The adjustment may be applied to the wireless power transfer device.

Abstract: Embodiments disclosed herein discloses a wireless charging system configured to generate and transmit power waves that, due to physical waveform characteristics converge at a predetermined location in a transmission field to generate a pocket of energy. Receivers associated with an electronic device being powered by the wireless charging system, may extract energy from these pocket of energy and then convert that energy into usable electric power for the electronic device associated with a receiver. The pocket of energy may manifest as a three-dimensional field (e.g., transmission field) where energy may be harvested by a receiver positioned within or nearby the pocket of energy. Video sensors capture actual video images of fields of view within the transmission field, and a processor identifies selected objects, selected events, and/or selected locations within the captured video images.

Abstract: Embodiments disclosed herein may generate and transmit power waves that, as result of their physical waveform characteristics (e.g., frequency, amplitude, phase, gain, direction), converge at a predetermined location in a transmission field to generate a pocket of energy. Receivers associated with an electronic device being powered by the wireless charging system, may extract energy from these pockets of energy and then convert that energy into usable electric power for the electronic device associated with a receiver. The pockets of energy may manifest as a three-dimensional field (e.g., transmission field) where energy may be harvested by a receiver positioned within or nearby the pocket of energy.

Abstract: Disclosed herein are systems, methods, and devices using an improved wireless communications component that allows for real time or near-real time data sampling reporting between devices using modified wireless communications protocols (e.g., Bluetooth®, Wi-Fi), and real time or near-real time behavior adjustments by a first device based on the data samples received from a second device. Embodiments disclosed herein comprise devices, such as receivers and transmitters, having communications components that may communicate data samples, such as power values, in real time or near-real time, thereby allowing a first device (e.g., transmitter) to adjust in real time or near-real time operational behavior of the first device's hardware or software (e.g., adjust power waves) based upon the data samples (e.g., power values) received from a second device (e.g., receiver).

Abstract: Various embodiments of the present invention are directed at a method and system for recharging batteries for wireless electronic devices. According to one embodiment, a battery charging and monitoring system is disclosed. The system includes a host machine providing a plurality of charging slots and a plurality of wireless devices coupled to and powered by a plurality of batteries. The host machine is adapted to communicate with the plurality of wireless devices through a plurality of wireless links to monitor the plurality of batteries coupled to the wireless devices. According to another embodiment, an electronic device is disclosed. The electronic device is adapted to couple with at least a rechargeable battery and to negotiate with the rechargeable battery for an agreed range of power parameters. The electronic device is further adapted to accept power from and to provide power to the rechargeable battery at the agreed range of power parameters.

Abstract: Various embodiments of the present invention are directed at a method and system for recharging batteries for wireless electronic devices. According to one embodiment, a battery charging and monitoring system is disclosed. The system includes a host machine providing a plurality of charging slots and a plurality of wireless devices coupled to and powered by a plurality of batteries. The host machine is adapted to communicate with the plurality of wireless devices through a plurality of wireless links to monitor the plurality of batteries coupled to the wireless devices. According to another embodiment, an electronic device is disclosed. The electronic device is adapted to couple with at least a rechargeable battery and to negotiate with the rechargeable battery for an agreed range of power parameters. The electronic device is further adapted to accept power from and to provide power to the rechargeable battery at the agreed range of power parameters.

Abstract: A method of balancing battery power can include: determining batteries to be balanced and directions of balance currents according to charge and discharge states and power states of the batteries, where each of the power states includes a state of charge, a remaining capacity, and a capacity to be charged; determining a reference of the balance current based on controlling temperatures of the batteries to be balanced to be lower than a temperature threshold when the SOCs of the batteries to be balanced are lower than a predetermined threshold; and balancing power of the batteries to be balanced according to the directions of the balance currents and the reference.

Abstract: A battery balance circuit configured for a battery apparatus having two batteries coupled in series, can include: first and second capacitors respectively coupled to two terminals of the two batteries; first and second switching circuits respectively coupled to the two terminals of the two batteries, where the first and second switching circuits are configured to control charging or discharging of each of the two batteries; a third capacitor coupled between the first and second switching circuits, where the third capacitor is configured to store or release energy in order to balance battery levels between the two batteries; and parasitic inductors, where the third capacitor and the parasitic inductors are configured to resonate, and the first and second switching circuits are configured to operate at a resonance frequency.

Abstract: A battery system having a battery having at least one first battery element, at least one second battery element and a center tap between the at least one first and the at least one second battery element, a power changeover switch having a plurality of switching elements for changing over between the at least one first battery element and the at least one second battery element, and at least one pair of output terminals that is electrically connected to the battery, wherein the center tap has a first capacitive store arranged on it that has a store voltage that appears over an appropriate period in accordance with a first and/or second battery element voltage provided by the first and/or second battery element, wherein during the period in which the store voltage appears, a store current decreases from a maximum value to a value of zero.

Abstract: Electric vehicle node controllers in accordance with embodiments of the invention enable adaptive charging.

Abstract: This invention relates to a portable case including a processor configured to control the portable case; a charging port; at least one output port; an adjustable energy storage system further including a battery printed circuit board (BPCB) including a plurality of battery packs connectors; and a central battery management microprocessor (CBMM); and a plurality of battery packs configured to be connected to the plurality of battery packs connectors and to provide power to electronic appliance connected to the at least one output port; a user interface configured to enable powering and monitoring of the portable case; and a recharging element, carryable by the portable case, the recharging element configured to be connected to the charging port and recharge at least one of the plurality of battery packs.

Abstract: A power bank system is provided for a motor vehicle. That power bank system includes a power bank charging module that is integrated into a body interior of the motor vehicle. The power bank charging module includes a dedicated receiver for a portable power bank. Further the power bank system includes a portable power bank that is displaceable between a charging position within the dedicated receiver and a mobile use position withdrawn from the dedicated receiver. Advantageously, the portable power bank may be utilized to power a portable electronic device of a user outside of the motor vehicle for an extended period of time.

Abstract: A portable power source and control device for a mobile phone or tablet is releasably attachable to a user's key ring or key chain and sized to be carried in a pocket or purse. The device has an internal rechargeable battery to provide emergency power for operating the user's phone, USB connectors for connection a power source and the phone, an internal microcontroller, and a Bluetooth® wireless communicator. A user actuator generated a locator command causes the phone to ring to indicate its location; and a locator command from the phone causes the device to emit a sound to indicate the device's location. The device can determine and indicate via LEDs the charge level of the battery, and has flash memory for data storage and transfer between devices.

Abstract: A method includes providing a first device, the first device having an electrode for placement at skin of a user, conveying power between the electrode of the first device and an electrode of a second device, wherein both the first device and the second device are associated with a personal area network and the second device is remote from the first device. The conveying power is performed through galvanic coupling.

Abstract: A controller (11) in a tap timer, having a battery (19) for connected via a charge circuit (23) to selectively charge a storage capacitor C2. The storage capacitor C2 is connected to an actuator circuit (25) to selectively provide power from the storage capacitor C2 to actuate a device M1. A processor (13) controls the actuator circuit (25) according to a pre-programmed schedule or on user demand. The processor monitors various parameters including charge rate of the capacitor C2 in order to determine battery condition, to determine if the processor (13) should next actuate the device (13).

Abstract: The disclosure is related to a system and method for autonomously charging a rechargeable power supply of an Unmanned Aerial System (UAS). The system can have battery power translator (BPT). communicatively coupled to the UAS. The BPT can have an energy source operable to deliver power at a native power level different than a designed power level of the UAS. The BPT can also have a voltage/current translator (VCT) operable to receive energy at the native power level from the energy source, and convert the energy at the native power level to converted energy at the designed power level for use by the UAS. The system can also have a remote charging system (RCS) communicatively coupled to the BPT. The RCS can also have a charging pad having a plurality of configurable terminals, and operable to receive the UAS and deliver recharge energy to the UAS.

Abstract: A portable charger and cradle assembly is provided for holding and charging an electronic device from an internal battery or an external power source wirelessly or via direct connection between the electronic device and the assembly. The assembly has a cradle housing with a support surface against which the electronic device may be held for wireless charging, and a support member attached to the cradle housing for positioning the cradle and electronic device as desired. At the end of the support member, a power connection interface is provided for coupling with an external power source to provide a charge to the electronic device via the charger and cradle assembly. In alternate embodiments, mounting means, such as a clip, can be provided at the end of the support member for holding the assembly in place.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, wireless chargers combined with wireless interrogators. The wireless chargers can transmit power wirelessly, while also wirelessly interrogating a nearby transponder, such as an RFID tag. The wireless chargers with wireless interrogators can also be programmable to allow user-implemented rules operable in response to an interrogation. Such rules can impose restrictions upon whether wireless charging is allowed to take place. Such rules can also be used to select a power-transmitting protocol that is particularly suited for the electronic device being charged. Other embodiments are disclosed.

Abstract: Techniques for facilitating wireless charging are discussed herein. For example, a power-consuming device may receive a light beam from a charging device. In response, the power-consuming device may determine a power level of a battery associated with the power-consuming device. The power-consuming device may wirelessly signal the power level to the charging device. In some instances, the power-consuming device may determine the power level of the battery without drawing power from the battery. Further, in some instances the power-consuming device may receive another light beam to charge the battery.

Abstract: The invention relates to an operating device (10) for at least one light-emitting diode (9) having an input (11) for coupling to a DC bus (6) in order to receive a DC supply voltage. The operating device (10) has a configurable emergency light function. The operating device (10) is designed to produce, in the emergency light case, the LED currently for the at least one light-emitting diode (9) in dependence on how the emergency light function is configured.

Abstract: A system includes a first input being configured to receive power produced from a renewable power source. A second input is configured to receive utility power from a utility power source. A first output is configured to output power to a consumer load. A second output is configured to output excess power to a load, wherein the excess power is an excess of power produced from the renewable power source after supplying the consumer load with power produced from the renewable power source.

Abstract: A method for monitoring an uninterruptible power supply system described herein includes receiving, at a server, data associated with a first UPS group having a first redundancy level; receiving, at the server, data associated with a second UPS group having a second redundancy level; monitoring the uninterruptible power supply system based on the first redundancy level and the second redundancy level; and based on the monitoring, providing control signals to a first device associated with the first UPS group and a second device associated with the second UPS group.

Abstract: An agricultural machine and attachment combination has a wireless attachment connection for transmitting electronic information, commands, and electric power between the agricultural machine and attachment. An agricultural machine side control system having a wireless interface is connected to the agricultural machine and an attachment side control system having a wireless interface is connected to the attachment. Each interface has at least one inductively coupled communication receiver and at least one inductively coupled communication transmitter. The transmitters and receivers cooperate to transmit electronic information and commands between the agricultural machine side control system and the attachment side control system. A primary coil is connected to the agricultural machine for transmitting power to the attachment. A secondary coil is connected to the attachment for receiving power from the agricultural machine.

Abstract: Techniques are described herein for enabling, among other features, more effective wireless charging of devices in wireless power delivery environments through enhanced signal focusing over multiple paths in a multipath wireless power delivery environment. More specifically, the systems and methods discussed herein describe techniques for increasing effective charging of devices, including enhanced ability to focus charging utilizing multiple pathways, phase detection of incoming signals allowing for movement detection in a wireless environment, phase synchronization, and directional arrays.

Abstract: Techniques are described for authenticating device in wireless power delivery environments. In some embodiments, a request for energy delivery is received from devices. The request may include an identifier, e.g., a client identification (ID). The charger may query a remotely located authentication platform via a network with the client ID. The authentication platform compares the client ID against devices that have been registered within the system. If the device is properly provisioned, the authentication platform may return an acceptance of authentication to the charger. In addition to device authentication, the current disclosure covers the ability to control the environment within a wireless network, and perform system diagnostics by monitoring the network environment.

Abstract: Methods and systems for improved efficiency when an inductive power transmitter associated with an inductive power transfer system experiences a low-load or no-load condition. More particularly, methods and systems for detecting when an inductive power receiver is absent or poorly connected to an inductive power transmitter. The inductive power transmitter includes, in one example, a current peak monitor coupled to an inductive power transmit coil. The current peak monitor waits for a current peak resulting from spatial displacement of a magnetic field source within the inductive power receiver, indicating to the inductive power transmitter that the inductive power receiver is moving, or has moved, toward the inductive power transmitter. Other examples include one or more Hall effect sensors within the inductive power transmitter to monitor for the magnetic field source of the inductive power receiver.

Abstract: A power conversion device includes a step-down-type transformer and a bridge circuit that rectifies output voltage of the transformer and supplies the rectified output voltage to a load. The bridge circuit is connected to a secondary winding of the transformer and includes MOS-FETs connected in series and diodes connected in series. A gate of the MOS-FET is connected to one end of a primary winding of the transformer with a capacitor interposed therebetween and a gate of the MOS-FET is connected to the other end of the primary winding of the transformer with a capacitor interposed therebetween. With this, a power conversion device and a wireless power transmission system that can achieve space saving and reduce loss in a rectifying element are provided.

Abstract: A wireless power-transmitting apparatus, includes a variable resonator; a power transmitter configured to wirelessly transmit power to a wireless power-receiving apparatus using the variable resonator; and a controller configured to determine class information of the wireless power-receiving apparatus and, in response, control the power transmitter to change impedance of the variable resonator according to the class information.

Abstract: Disclosed herein are systems, methods, and devices using an improved wireless communications component that allows for real time or near-real time data sampling reporting between devices using modified wireless communications protocols (e.g., Bluetooth®, Wi-Fi), and real time or near-real time behavior adjustments by a first device based on the data samples received from a second device. Embodiments disclosed herein comprise devices, such as receivers and transmitters, having communications components that may communicate data samples, such as power values, in real time or near-real time, thereby allowing a first device (e.g., transmitter) to adjust in real time or near-real time operational behavior of the first device's hardware or software (e.g., adjust power waves) based upon the data samples (e.g., power values) received from a second device (e.g., receiver).

Abstract: A magnetic drive enhancement is provided to offset kinetic forces found in a rotational system to improve the mechanical efficiency of the rotational system. A housing includes rotationally biased magnetic fields in which a central axle or driveshaft may rotate. The magnetic fields are generated, shaped, and rotationally biased by a plurality of driving magnets and magnetic shields. Attached to the driveshaft are magnetic receivers, which are influenced by the rotationally biased magnetic fields at varying strengths as they orbit within the housing. The magnetic fields are shaped to provide increasing and decreasing strength of flux to counteract the physical forces experienced by the driveshaft to thereby increase the efficiency of the rotational system.

Abstract: A stator includes a yoke, teeth, insulating members, a first ribs, coils, annular members and adhesive bodies. The insulating members each have circumferential wall and a flange. The flange includes a plate wall. The first ribs protrude from the respective flanges. The coils each wound on the outsides of the circumferential wall and the first ribs of each of the teeth. The annular members close teeth distal end sides of cavities. A first hole and a second hole are provided in the plate wall. The turning passage contains varnish charged through the injection hole.

Abstract: Rotor formed by groups of materials (4) that orientate the magnetic field and magnets (2) in spiral lines, with the two magnetic poles of each magnet (2) facing the stator (3). Close to a magnetic pole of the end of the group, the material (4) that orientates the magnetic field protrudes towards the stator (3). This configuration enables to vary the field of each magnetic pole of the rotor which is projected to the stator; in this way, one end of the group of magnets (2) concentrates a very close magnetic pole in order to interact with the stator (3) and the opposite magnetic pole moves away gradually in order to decrease the interaction with the stator (3). The application is for magnetic motors.

Abstract: An inner-rotor motor and a rotor of the inner-rotor motor are provided to reduce the noise or vibration generated during the rotation of the motor. The rotor includes a shaft, an iron core, a plurality of permanent magnets and a limiting member. The iron core includes a magnetic yoke portion coupled with an outer periphery of the shaft, as well as a plurality of magnetic pole portions circumferentially coupled with an outer periphery of the magnetic yoke portion. The iron core forms a plurality of receiving portions, and each receiving portion is formed between two adjacent magnetic pole portions. The permanent magnets are received in the receiving portions, respectively. The limiting member is arranged at one side of the iron core, and includes a covering face covering the permanent magnets in the axle direction of the shaft.

Abstract: A rotor for a small electric engine. The rotor having a rotor axis, multiple permanent magnets that are arranged in a spoke-shaped way as well as several inference cores. Each of the permanent magnets has two axial ends, two longitudinal sides, a radial outer side as well as a radial inner side. The inference cores protrude radially over the permanent magnets in relation to the rotor axis. The rotor is enclosed at least partially by a casting mold having multiple struts that extend in an axial direction and that overlap radially with the permanent magnets. The inference cores do not overlap with the permanent magnets on their radial outer sides, wherein both the permanent magnets as well as the inference cores are held together primarily directly by the casting mold in a radial direction.

Abstract: A double resonance vibration motor includes a housing, vibration parts in the housing, a coil fixed in the housing, and elastic connectors to support elastically the vibration part. The vibration parts include a mass block, a first magnet group and a second magnet group installed in the mass block. The coil is opposite to the first magnetic group and the second magnetic group. The driving force generated by the first magnetic group and the coil makes the vibration motor vibrate along the first direction. The driving force of the second magnet group and the coil makes the vibration motor vibrate along the second direction. The first direction and the second direction are intersected. Two different directions have respectively one resonance frequency. Two different resonant frequencies can vibrate alone or at the same time, to realize the control in different vibration directions.

Abstract: An electric machine may include at least one stator and at least one rotor mounted to rotate relative to the stator, the stator and/or the rotor including at least one electrically conductive conductor winding, wherein at least some sections of the at least one electrically conductive conductor winding are formed from nano-scale carbon structures combined into at least one textile structure, or include nano-scale carbon structures combined into at least one textile structure.

Abstract: The subject matter of the present invention relates to an electric machine (10) for converting mechanical energy into electrical energy or vice-versa, in particular a generator such as a Lundell alternator and/or a belt-driven starter generator, having at least two conductive components with a magnetic flux therebetween during conversion, in particular having at least one rotor (20) and at least one stator (16) associated therewith, wherein a damping device (100) of the type of a shim (101) is integrally bonded without strain to at least one of the two components, that is to say without strain relative to another component, or between adjacent components, in order to reduce magnetic noise. The invention further relates to a method and to a use thereof.

Abstract: The invention relates to an electric machine comprising a stator (1) and a rotor (2) movable relative to said stator. Said stator comprises two multi-stranded, concentrated windings (A1, B1, C1, A2, B2, C2) which are placed in respective slots of the stator (1). While the first winding (A1, B1, C1) comprises six coils, the second winding (A2, B2, C2) is designed to have twelve coils. The number of turns (Nw1) of the coils of the first winding is different from the number of turns (Nw2) of the coils of the second winding.

Abstract: A rotor cap for an electric generator, e.g., a high-speed turbogenerator, is disclosed, along with a production method for such rotor cap. The rotor cap is at least partially made of fiber-reinforced plastic material. The rotor cap may have cooling fluid passages, e.g., extending in an axial direction, in the area of the fiber-reinforced plastic material.

Abstract: A wiring terminal and a motor including the wiring terminal are provided. The wiring terminal includes: a mounting subassembly adapted to embed in a slot of an end insulator of a motor, a connection subassembly configured to support a wire stock having a lead wire, and a winding subassembly configure to receive an enameled wire wound on the winding subassembly. The connection subassembly and the winding subassembly are disposed on the top surface of the mounting subassembly. The lead wire of the wire stock is electrically connected to the enameled wire wound on the winding subassembly.

Abstract: Disclosed is a steering motor, comprising a casing (10) and a stator (15), an outer wall of the stator (15) and an inner wall of the casing (10) forming a chamber (16). The steering motor further comprises an upper cover buffering assembly (1) and an oil distributor (2), which are fitted with each other to form an axial cavity (4). A cylinder assembly (5) is provided below the oil distributor (2), and comprises a cylinder (51) and an elastic oil bag (52). Furthermore, the cylinder (51) is provided internally with a piston (53) which is connected to a lower end of the elastic oil bag (52) and slides axially along the cylinder. An oil flow passage (23), an oil inlet (22) and a hollow column (21) are provided in the oil distributor (2), the oil flow passage (23) being in communication with the axial cavity (4), and an inner wall of the hollow column (21) being provided with an oil flow port in communication with the oil flow passage (23).

Abstract: Disclosed is a double oil passage structure of a steering motor, comprising an upper cover buffering assembly (1) and an oil distributor (2), which are fitted with each other to form an axial cavity (4), wherein an oil flow passage (23), an oil inlet (22) and a hollow column (21) are provided in the oil distributor (2), the oil flow passage (23) being in communication with the axial cavity (4), and an inner wall of the hollow column (21) being provided with an oil flow port in communication with the oil flow passage (23); a directional control valve (3) including a valve core (31) is provided in the hollow column (21), and a first radial cavity is formed between the hollow column (21) and the directional control valve (3) and partitioned by a pin (7) into oil inlet and outlet cavities (24, 25) of the oil distributor which are respectively in communication with the oil inlet (22) and the axial cavity (4); a directional control valve oil flow passage (33) is provided on an upper part of a side wall of a valve c