127 results about "Rotational rate" patented technology

A fall-arrest device (1,26) for use during rope-climbing activities, the device comprising or including a housing (5) for rotatably receiving therewithin a brake wheel (11,30) supported on an axle (20), the housing including anchor means (3,4) permitting connection of the device to a user thereof, the brake wheel having peripheral teeth (17,29) adapted to, in use, engage with a mid-portion of an anchored safety rope (2), the housing being openable by a gate (5a) through which to receive part of the anchored safety rope and thereafter being closable to trap the safety rope between the teeth of the brake wheel and a rope bearing thrust surface (18,28) on or in the housing, the brake wheel having associated automatic locking means (23,24), preventing rotation of the brake wheel about the axle above a nominal rate of rotation, the brake wheel locking means being spring-biased (14) to a stored position when the brake wheel is stationary or rotates below the nominal rate during use, the brake wheel locking means (24) being movable from the stored position to an operable position in which it engages with one or more locking formations (23) preventing further rotation of the brake wheel about the axle, the brake wheel axle being drivingly secured at at least one end thereof to a respective pinion (13a, 13b) having teeth extending radially therefrom, the teeth of the or each pinion being engageable with a respective toothed rack (12a, 12b,27) fixed to the inside of the housing whereby to permit the brake wheel to assume a path of movement further towards the thrust bearing surface such that when rotation of the brake wheel exceeds the nominal rate and has been arrested, such that when the rate of rotation of the brake wheel relative to the anchored rope exceeds the nominal rate, the axle and brake wheel are progressively driven further towards the thrust bearing surface to thereby cause the teeth of the brake wheel to progressively bite into the rope and arrest downward movement of the device along the rope.

Disclosed are surgical tool systems and methods for installing a fixator in biological tissue with precision and efficiency. These systems are designed to measure torque and rotational velocity accurately while providing real-time feedback to the user during surgical procedures. Utilizing integrated sensors, the system calculates torque and energy-rotation parameters, including mean torque, mean rotational velocity, mean power, and total energy. Based on these measurements, the system generates a Property I value—a weighted combination of these parameters—to assess whether the operation falls within optimal ranges. If the Property I values deviate from these ranges, the system generates corrective signals and adjusts the tool's operation to ensure optimal performance. In some cases, this iterative process continues until the fixator installation is successfully completed, enhancing surgical accuracy and reducing the risk of errors.

This invention discloses a method, system, and self-moving device for multi-sensor clock synchronization. The method is applied to a self-moving device including a first sensor and a second sensor. The method includes generating a first rotational speed-time curve for the first sensor and a second rotational speed-time curve for the second sensor during the rotation of the self-moving device; determining the phase difference between the first and second rotational speed-time curves; and adjusting the clocks of the first and second sensors to be synchronized based on the phase difference. This method and system for multi-sensor clock synchronization more intelligently and effectively improves the efficiency of multi-sensor clock synchronization.

Position sensing related to a component within a power tool. The component within the power tool is, for example, a hammer of an impact mechanism and can include one or more sensible features that allow a controller of the power tool to precisely determine the position, speed, and acceleration of the component. One or more sensors can be used to determine the rotational position of the hammer and the axial position of the hammer. The rotational position of the hammer can then be used to calculate, for example, rotational speed and acceleration of the hammer. With precise determinations of the rotational and axial position of the hammer, the controller of the power tool is able to precisely time the impact between the hammer and the anvil to optimize the impact between the hammer and the anvil (e.g., to maximize energy transfer between the hammer and the anvil).

A method for detecting and responding to a failure in a drivetrain of a wind turbine includes estimating a first rotational speed signal at a first location along the drivetrain via one or more rate gyroscopes mounted in a hub, the first rotational speed signal being a proxy for rotor speed of a rotor. The method also includes processing the first rotational speed signal to account for a bias in the first rotational speed signal due to use of the rate gyroscope(s). Further, the method includes receiving a second rotational speed signal at a second location along the drivetrain, the second location being downwind from the first location, the first and second locations being on opposing sides of a potential slip location of the drivetrain. Moreover, the method includes determining a speed error based on a comparison of the first and second rotational speed signals. In addition, the method includes comparing the speed error to a threshold and implementing a control action when the speed error exceeds the threshold.

The motor speed control device of the embodiment includes a rotational speed estimation unit and a control unit. The rotational speed estimation unit generates an estimated value of the rotational speed of the motor using a result of FFT analysis of a speed detection signal ωFBK obtained based on a detection result of a resolver that detects the rotational speed of the motor, and the speed detection signal ωFBK. The control unit performs speed control in such a manner that a deviation between a speed command value for the speed control of the motor and the estimated value of the rotational speed is reduced.

An actuator assembly for a fluid control device. A fluid control device includes: a body, a valve seat, and a control element. The body has an inlet, an outlet, and a fluid flow path between the inlet and outlet, and the control element is coupled to a valve stem. The control element and the valve stem are movable relative to a longitudinal axis and biased toward a closed position, in which the control element engages the valve seat. The actuator assembly is operatively coupled to the valve stem and includes a planetary gear drive configured to receive a first rotational speed and transmit a second rotational speed different from the first rotational speed. A shaft has a first end coupled to the drive mechanism and a second end coupled to the valve stem. The second rotational speed is transmitted to the valve stem to move the control element between a closed position and an open position.

Even if the motor resolver itself in the vehicle is displaced relative to the drive wheels, the motor is controlled at a precise rotational speed corresponding to the rotational state of the drive wheels. [Solution] The rotation speed control device 10 is a rotation speed control device 10 for a motor 4 that drives the vehicle 1 while being elastically supported by the vehicle body 8, and comprises a relative rotation speed acquisition unit 11 that acquires the relative rotation speed ωre of the rotor 4r with respect to the stator 4s of the motor 4, a posture acquisition unit 12 that acquires the relative posture θst of the stator 4s with respect to the vehicle body 8, and a calculation unit 13 that calculates the rotation speed of the motor 4 as the absolute rotation speed ωab of the rotor 4r with respect to the vehicle body 8 by correcting the relative rotation speed ωre using the relative posture θst.

A transmission device (21) is provided with an input shaft (22), an output shaft (23), a planetary continuously variable transmission mechanism (24), a direct coupling mechanism (27), an idler element (28), a multi-speed transmission mechanism (26), and a controller (25). A controller (25) controls the rotational speed of a first transmission member (33) of the planetary continuously variable transmission mechanism (24) and the engagement and disengagement of a first clutch (27C) of the direct coupling mechanism (27). The controller (25) can switch the transmission device (21) to three transmission states, namely a first transmission state (stepless speed change), a second transmission state (internal lock) and a third transmission state (external lock).

A method for producing silicon single crystal by CZ method using a cusp magnetic field formed by upper and lower coils coil provided in pulling furnace, the silicon single crystal is pulled up in a straight-body step by setting a rotational rate of the silicon single crystal to 7 rpm or more and 12 rpm or less, rotational rate of a quartz crucible to 1.0 rpm or less, position of a magnetic field minimum plane of the cusp magnetic field in a range of 10 mm downward to 5 mm upward from a raw-material melt surface, and intensity of magnetic field of cusp magnetic field at intersection of plane having same height as magnetic field minimum plane and inner wall of quartz crucible from 800 to 1200 G. Method for efficiently producing silicon single crystal having lower oxygen concentration and better in-plane distribution of oxygen concentration compared to conventional techniques.

Various electric mid-drive units are disclosed herein. The electric middle drive unit may be configured to drive a vehicle (e.g., a bicycle) having one or more cranks and driven wheels. The electric middle drive unit may include an electric motor, a decelerator, a gearbox (which may include one or more gears), a first one-way bearing, and a second one-way bearing. The first one-way bearing can enable power of the motor to be transmitted to the driven wheel. The second one-way bearing can enable the power of one or more cranks to be transmitted to the driven wheel. The decelerator may reduce the rotational speed output of the electric motor, which may be transmitted to the driven wheel. The electric mid-drive unit may enable a user to propel the vehicle with one or more cranks, with an electric motor, and / or with one or more cranks and an electric motor simultaneously.

This design relates to a servo motor driver for controlling the rotation speed of a servo motor.

Provided are a stirring blade and the like capable of effectively applying a shear force to a fluid having a Reynolds number of 300 or more. The stirring blade (3) stirs a fluid (F) by rotating about a rotating shaft (30), the stirring blade (3) generates a flow of the fluid (F) having a Reynolds number of 300 or more, and in a 5% or more region of the flow, the ratio of a deformation velocity tensor to a velocity gradient tensor of the fluid, which is the sum of a deformation velocity tensor and a rotational velocity tensor, is 0.8 or more. The stirring blade (3) is provided with a plurality of plate-shaped members (311-314) capable of rotating at different positions in the radial direction perpendicular to the axial direction in which the rotating shaft (30) extends. The present invention is provided with two or more and five or less plate-shaped members (311-314) capable of rotating at two or more and five or less different radial positions.

In a centrifuge which employs a rotation detector for generating M-number (where M≥1) of pulse signals per rotation of a motor, a control unit compares a time interval T (n−1, m) of a pulse signal one rotation before an immediately preceding pulse detected by a rotation detector with a time interval T (n, m) of a recent detection pulse signal, and then, from an increase or decrease between the time interval T (n−1, m) and the time interval T (n, m), calculates the rotational speed by using a formula of rotational speed N (n, m)=N (n−1, m)×T (n−1, m)÷T (n, m).

A steering control system adapted for use on a vehicle having two or more wheels each configured to rotate about a rotational axis, at least one of the wheels being a driven wheel and at least one of the wheels being a turning wheel, and an automatic pivot steer mode. The system further comprises a vehicle speed sensor, a steering sensor, a steering control device, a speed control device, and a controller in communication with the speed sensor, the steering sensor, and the speed control device. The controller receives inputs from the speed sensor and the steering sensor and, if both inputs fall within a predetermined range, activates a speed control device thereby altering the rotational speed or direction of at least one of the two or more wheels of the vehicle, reducing the turning radius of the vehicle.

A for hardening a bridge assembly of a rotational body having an axis of rotation for an electrical drive, including the steps for balancing and rotational hardening of, rotating the rotational body about an axis of rotation at an imbalance determination rotational speed to detect an imbalance of the rotational body, determining the imbalance of the rotational body, fastening at least one balancing weight to or removing at least one balancing weight from the rotational body at a standstill rotational speed to compensate the imbalance, the hardening including rotating the rotational body about the axis of rotation at a hardening rotational speed, the magnitude of the hardening rotational speed being greater than the magnitude of the imbalance determination rotational speed.

The utility model provides a variable frequency speed regulation hydraulic synchronous control system, and relates to the field of stage performance equipment. The system comprises an upper computer man-machine interaction system, a PLC (Programmable Logic Controller), a frequency converter, a hydraulic oil pump, a hydraulic cylinder, a lifting tabletop, a variable frequency motor, a hydraulic oil pump, an oil tank and an electromagnetic directional valve. The rotating speed of the variable frequency motor is controlled through the frequency converter to adjust the oil outlet speed of the hydraulic oil pump, then the piston speed of the oil cylinder is adjusted, the response speed is high, variable frequency and speed regulation synchronous operation of the hydraulic lifting platform is achieved, and then stable operation of the lifting platform driven by multiple cylinders synchronously and stepless speed regulation of the hydraulic lifting platform are achieved. The synchronous positioning precision of the hydraulic lifting platform is improved, the domestic and international control performance requirements of the stage lifting platform are met, the synchronous precision is smaller than + / -5mm, the positioning precision is smaller than + / -3mm, the lifting stability and safety of the lifting platform are guaranteed, and the method has wide application prospects.

A method of processing a substrate includes an etchant supplying operation of supplying an etchant to a substrate; a puddle operation of, by rotating the substrate at a first rotational speed, forming a liquid film of the etchant supplied to the substrate in a puddle shape; and a thickness adjusting operation of changing a rotational speed of the substrate to a rotational speed different from the first rotational speed to adjust a thickness of the liquid film of the etchant. Using the method, dispersion of the etching rate may be effectively controlled.

When a holding unit is lowered, a control unit gradually increases the lowering velocity of the holding unit toward a target lowering velocity, performs a constant velocity lowering operation of maintaining the lowering velocity of the holding unit at the target lowering velocity, and then gradually decreases the lowering velocity of the holding unit from the target lowering velocity to stop the holding unit. The control unit controls the drive unit to gradually increase the rotational velocity of the pulleys in response to a gradual decrease in the diameter of the outer surface of the belt wound-up around the pulley by unwinding in the constant velocity lowering operation.

The application discloses a fan control method, a controller, a fan and an air conditioner. The fan control method comprises the following steps: acquiring current data or voltage data of the fan when the fan of the air conditioner is in a pre-processing stage; determining an initial rotating speed of the fan and a rotating direction corresponding to the initial rotating speed according to the current data; determining a first rotating speed change rate according to the initial rotating speed and the rotating direction when the fan of the air conditioner is in a speed closed loop stage, and controlling the fan according to the first rotating speed change rate. In the technical scheme of the embodiment, the first rotating speed change rate has fully considered the wind force problem of the fan, so that the serious uneven change of the wind wheel load in the process of changing the rotating speed of the fan can be effectively prevented, the shutdown protection problem can be avoided, and the reliability of the fan operation is effectively improved.

A system for controlling at least one active magnetic bearing of a rotating machine comprising a rotor (1) and a stator, the control system being provided with at least one device (3a, 3b) for measuring the radial position of the rotor relative to the stator from signals from at least two position sensors (2a, 2b), and at least two control loops (7a, 7b) of the active magnetic bearing depending on the radial position of the rotor, each control loop of the magnetic bearing being provided with at least one synchronous filter (6a, 6b) depending on the rotational speed of the rotor, and a device (10) for determining the rotational speed of the rotor relative to the stator, which device receives as input the measurement of the radial position of the rotor from the measuring device (3a, 3b) and is executed within a predetermined time while the rotational speed of the rotor is zero depending on the measurement of the radial position of the rotor.

This utility model provides a dual-speed gear head for vertical machining centers, relating to the field of gear head technology. It addresses the problem that in vertical machining centers, when processing different workpieces, the spindle rotation speed is directly adjusted by a motor, but this is affected by factors such as power grid voltage fluctuations and motor heat generation, leading to decreased stability and increased costs over long-term operation. The head includes a main body; a motor is mounted on the top side of the main body; a spindle is rotatably mounted inside the main body; a large gear A is mounted on the spindle; a small gear A is mounted on the spindle; a control cylinder B is mounted on the top of the main body; a mounting component is mounted at the bottom of the control cylinder B; a large gear B is mounted on the bottom rotating shaft of the mounting component; and a small gear B is mounted on the bottom rotating shaft of the mounting component. By extending and retracting the control cylinder B, the mounting component moves on the rotating shaft, thereby meshing the large gear A and small gear B, or vice versa, as needed. This meshing of the gears drives the spindle to achieve dual-speed adjustable rotation.

Parking lock device for a motor vehicle transmission, comprising a parking lock wheel (1) having teeth (3) and tooth gaps (4) and a parking lock pawl (2) having a pawl tooth (5), wherein the parking lock wheel (1) performs a rotary movement with a rotation angle (cp) and a rotational speed (φPoint) about an axis of rotation and the parking lock pawl (2) performs a pivoting movement with a pivot angle (w) and a pivoting speed (ωPoint) about a pivot axis which is arranged parallel to the axis of rotation, wherein the teeth (3, 13) of the parking lock wheel (1) each have a first contour (13a) and, viewed in the direction of rotation (D) of the parking lock wheel (1), each have front and rear tooth flanks (13b, 13c), wherein the pawl tooth (5,15) has a second contour (15a) and relative to the direction of rotation (D) of the parking lock wheel (1) has a front and a rear tooth flank (15b, 15c), wherein the parking lock wheel (1) has an outer radius (r aR ) shows, wherein at least one of the two contours (13a, 15a) is at least partially designed as a mathematical function whose curvature is no more than 20% of an outer curvature of the parking lock wheel (1), which is the reciprocal of the outer radius (r) aR ) of the parking lock wheel (1) is defined, differs, and wherein the teeth (13) and / or the pawl tooth (15) in the area of ​​the front tooth flanks (13b, 15b) of parking lock wheel (1) and / or parking lock pawl (2) have a head retraction (δ) relative to the outer radius (r) aR ) of the parking lock wheel (1), wherein the head retraction (δ) consists of a proportion (δ R ) for the teeth (13) of the parking lock wheel (1) and a proportion (δ K ) for the latch tooth (15), characterized in that the second contour (15a) with reference to the axis of rotation (M R ) is concave.

A non-transitory computer readable medium having a computer program stored thereon causes a computer to perform a method for controlling a drilling system in a manner that reduces stick-slip including: receiving a desired rotation speed v0 of the drive system to rotate the drillstring, receiving property measurements of the drilling system, and deriving therefrom a rotation speed vup of upgoing rotational waves of the drillstring associated with upgoing rotational energy in the drillstring. An actual rotation speed v of the drive system to rotate the drillstring is determined by representing energy in the drillstring as a mathematical expression containing a sum of rotational energy produced by the drive system and downgoing rotational energy caused by the upgoing rotational waves that are reflected at an upper end of the drillstring, and then optimizing the mathematical expression, which is then used for controlling the drive system to rotate the drillstring at v.

The invention relates to a power tool containing a first electric motor, a first shaft, a transmission device, a tool holder, a control device, a power supply and a rotatably mounted fan. The power tool contains a drive device which can be connected to the fan in such a way that the fan can be driven at at least a first and a second rotational velocity, the drive device being designed in such a way that selectively either the rotational velocity of the fan corresponds to a rotational velocity of the electric motor or the rotational velocity of the fan is higher or lower than a rotational velocity of the electric motor. The invention also relates to a method for the open-loop and closed-loop control of a power tool containing a first electric motor, a shaft, a transmission device, a tool holder, a control device, a power supply, a storage unit and a fan which can be driven by a drive device. The method comprises the following method steps: - capturing at least one temperature value; - comparing the temperature value with a temperature threshold value; and - adjusting the drive device from a first rotational speed value to a second rotational speed value if the temperature value corresponds to the temperature threshold value.

A tension airfoil assembly includes an outer rim located concentrically with a hub supported by a plurality of spokes, each spoke extending therebetween. A series of airfoils, each airfoil having an aerodynamically lifting shape extending between a leading edge and a trailing edge. The tension airfoil assembly can be employed as an electrical power generating system, a propulsion and / or lifting device integrated into a vehicle, such as an airplane, a helicopter, a tandem rotor helicopter, etc. The power generating system can be optimized by applying an electrical load to reduce a rotational rate of the blade assembly. The optimal load can be determined and controlled by a computing system, preferably using Artificial Intelligence, which constantly or periodically monitors the conditions. The load is determined by a stall speed, a wind velocity, and a variation of the wind velocity.

The invention relates to the technical field of automatic control, in particular to a real-time control method for the rotating speed of a friction stir welding stirring tool, and the method comprises the following steps executed in each control period: collecting the actual temperature of a welding area and carrying out filtering processing; and estimating a current temperature state estimation value and a current total disturbance estimation value through an extended state observer by using the filtered actual temperature and a final control instruction of a previous control period. According to the method, the extended state observer (ESO) is combined with the PID controller, so that the total disturbance formed by unmodeled dynamics, nonlinearity and external disturbance in the welding process can be estimated and actively compensated in real time. Compared with passive response of traditional PID control to disturbance, the method achieves feedforward active suppression of disturbance, and the robustness and precision of a control system are remarkably enhanced.

A drive system has at least one drive unit each drive unit including a central shaft and a central gear connected to the central shaft such that the central gear rotates at a speed of the central shaft. Two to four decentralized gears are distributed around the circumference of the central gear and mesh with the central gear such that the rotational speed of the central gear is at least 0.5 times the rotational speed of the decentralized gears. A plurality of electric machines are operable at a speed of at least 4,000 rpm, and each decentralized gear wheel is coupled directly and without transmission ratio to a single electric machine or to two electric machines, respectively.

A blower includes a body, a motor, and a single fan configured to rotate in response to rotation of a motor shaft to discharge air through a discharge opening. The maximum rotational speed of the motor shaft is within a range of 50,000 rpm to 120,000 rpm. An area of the discharge opening is changeable by a user. The blower is configured to selectively operate in a first mode or in a second mode according to the area of the discharge opening. In the first mode, the maximum blowing force of the air discharged through the opening is within a range of 2.5 N to 5.0 N when the motor is driven at the maximum rotational speed. In the second mode, the maximum dynamic pressure of the air discharged is within a range of 30 kPa to 65 kPa when the motor is driven at the maximum rotational speed.

A large nuclear-powered ship, such as a repurposed aircraft carrier or a large cargo ship, is outfitted with a plurality of large downward-directed subsurface mixer propellers secured on its sides and / or ends. The propellers are positioned below the bottom of the ship and have blade lengths in the range of 10-60 m. They are coupled to the ship's steam turbines by drive shafts and gearing compatible with the required propeller power and rotational rates, typically 25-150 MW per mixer propeller and with blade tip speeds typically around 40 m / s. They produce a large-diameter low-velocity downward plume of surface sea waters below the ship that induces upwelling of cold nutrient-rich deep waters in areas where the cyclone genesis index is high. The downward mass-flow magnitude (typically 3-30 times the flow rate over Niagara Falls, but at only a few m / s) is on the scale needed for a small number of such ships to essentially end cyclone genesis in the Atlantic. At the same time, the induced upwelling of nutrient-rich deep waters is expected to lead to the newly mixed areas becoming highly productive fishing areas.