428 results about "Rotational rate" patented technology

A hinge includes a hinge body, a self-close mechanism disposed within the hinge body, and a slow-close mechanism disposed within the hinge body. The hinge body has a first portion and a second portion, the first portion is rotatable with respect to the second portion between an open position and a closed position. The self-close mechanism applies a closing force on the first portion from a first angle of rotation between the first portion and the second portion to the closed position, the closing force urging the first portion to the closed position. The slow-close mechanism applies a damping force on the first portion from a second angle of rotation between the first portion and the second portion to the closed position, the damping force slowing a rotational speed of the first portion to the closed position.

Apparatus and methods relate to a gear reducer, which may be used downhole to reduce rotational speed output from a downhole motor, such as a turbine motor, to a slower speed desired for rotation of a drill bit. The gear reducer includes a planetary gear arrangement coupled to receive rotational input from the downhole motor and a cycloidal gear arrangement driven by rotation resulting from the planetary gear arrangement. An output shaft couples to the cycloidal gear arrangement and rotates during operation slower than the rotational input from the downhole motor.

An impact power tool includes a housing, a motor, a controller, an impact mechanism configured to be driven by the motor, and an output spindle configured to receive rotational impacts from the impact mechanism to rotate the output spindle. The controller is configured to detect a first impact of the rotational impacts or to detect when the motor speed drops below a speed threshold value. The controller is configured to control the motor to have a first non-zero target rotational speed using closed loop control for a predetermined time period after the first impact is detected or when the motor speed dropping below the speed threshold value is detected. The controller is configured to control the motor to have a second non-zero target rotational speed using the closed loop control after the predetermined time period. The first non-zero target rotational speed is less than the second non-zero target rotational speed.

The invention provides a motor control method and device, and the method comprises the steps: applying a first suspension current to a first stator, and applying a first rotation current to a second stator, so as to control the suspension of an impeller to rotate at a first position; when the rotation speed of the impeller reaches the target rotation speed, the second rotation current is applied to the first stator, and the first suspension current and the second rotation current are applied to the second stator. The two stators are arranged, after the impeller reaches the target rotating speed, the first stator and the second stator are used at the same time to control rotation of the impeller, the power consumption of the second stator can be greatly reduced, and therefore the service life of the motor is prolonged.

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.

A computer system comprising processing circuitry configured to: receive an engine restart request for restarting an engine of a vehicle while the vehicle is moving; receive, directly from the engine, a signal encoding a real-time rotational speed of the engine; and control an actuator to gradually engage a clutch of a transmission coupled to rotating wheels of the vehicle in such a way that a rate of change of the real-time rotational speed of the engine is kept below a predefined threshold rate of change.

To provide a wheel of a belt sander which enables a feeding speed of a sanding belt to be changed with means other than changing of a rotation speed of a driving source, and to provide a wheel set and a belt sander.SOLUTION: A tube belt sander, one example of a belt sander, includes: an electric motor; and a first driving wheel and a second driving wheel 300 for attaching a sanding belt B. The second driving wheel 300 includes a planetary gear mechanism M which reduces a speed of rotational driving force from the electric motor. The second driving wheel 300 further includes an inner cylinder body 371 and a first shaft body 301. The inner cylinder body 371 is attached to a housing 10 of the belt sander. The first shaft body 301 has a receiving part 301R for receiving the rotational driving force from the electric motor and is disposed at a radial inner side of the inner cylinder body 371.SELECTED DRAWING: Figure 13

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.

In a roll stand (1), a rolling material (2) made of metal and having a rolling material leading edge (6) is to be rolled. A time of entry (t3), a rolling speed (vW) and a rolling moment (MW) are known to a control device (7) for the roll stand (1) before the rolling material leading edge (6) runs into the roll stand (1). Before a starting time (t2), which is before the entry time (t3), the control device (7) determines, for a period from the starting time (t2) to the entry time (t3), a moment profile (M) for a roller (3) of the roll stand (1) via a drive (4) driving a drivetrain (5). It controls the drive (4) during the period in accordance with the determined moment profile (M). The control device (7) determines the moment profile (M) starting from a starting state (x2), at the starting time (t2), of the drive (4), of the drivetrain (5) and of the driven rollers (3) of the roll stand (1) such that the driven rollers (3) of the roll stand (1) are acted on by the drivetrain (5) with the rolling moment (MW) at the entry time (t3) and rotate with a circumferential speed (vU) adapted to the rolling speed (vW).

A method and system for assessing heaviness of a stroke in a racket sport, such as a groundstroke in tennis, is disclosed. The system may display the calculated heaviness of the stroke in real-time. As the player hits strokes, the system will measure linear and rotational speed of the ball and calculate a heaviness value for the stroke based on the physics of translational and rotational kinetic energy of the ball.

To provide a control device and a control method, which can more satisfactorily control an electric power generation system equipped with a gas turbine engine and an electric power generator, and a movable body equipped with a control device.SOLUTION: A control device comprises: a first rotation speed acquisition unit that acquires a first rotation speed, which is the rotation speed of a gas turbine engine, on the basis of a signal supplied from a rotation speed sensor; a second rotation speed acquisition unit that acquires a second rotation speed, which is the rotation speed of an electric power generator, on the basis of a signal supplied from a rotation angle sensor; a comparison unit that compares the first rotation speed with the second rotation speed; and a control unit that controls the gas turbine engine and the electric power generator based on the lower of the first rotation speed and the second rotation speed, on the basis of the comparison result by the comparison unit.SELECTED DRAWING: Figure 10

The invention relates to a strain wave gear mechanism comprising: a wave generator which is rotatably mounted relative to a flexspline about an axis of rotation; and a gear which meshes with the flexspline. The problem is solved by a strain wave gear mechanism which is characterised by: at least one deformation measurement sensor which measures a deformation, in particular a radial deformation, of the gear and / or of a transmission component which is connected to the gear or to the flexspline, said deformation being caused by the shape of the wave generator; and an evaluation device which receives measurement signals from the at least one deformation measurement sensor and, on the basis of the measurement signals, determines the rotational position and / or the rotational speed and / or the direction of rotation of the wave generator and / or of a transmission element rotating in accordance with the reduction ratio of the strain wave gear mechanism, in particular of the flexspline, in particular relative to the gear or relative to the flexspline.

The invention discloses a motor controller and a method for reducing load torque ripple. A motor controller includes: a measurement interface configured to measure a mechanical angle of a shaft driven by a motor and a rotational speed of the shaft, and to generate a speed feedback signal representative of the rotational speed; a speed regulator; and a current regulator. The speed regulator includes an error component configured to generate a speed error signal based on a difference between a speed reference signal and a speed feedback signal; a proportional-integral controller configured to adjust a torque reference value based on the speed error signal, the torque reference value configured to maintain a speed reference value; and a load torque ripple compensator configured to apply a torque feed-forward function to reduce a load torque ripple in the torque reference value. The current regulator is configured to drive a motor current of the motor to generate a torque corresponding to the torque reference value.

To provide a program or the like allowing a player to grasp a rate of rotation at optional timing in a game of a game machine.SOLUTION: A computer receives input of a rotational frequency showing the number of lotteries from the most recent winning at a point of time when a game machine wins a lottery during a game of the game machine having a start pocket in which a predetermined lottery is held when game balls enter it according to a program. Then, the computer calculates a rate of rotation showing a rotational frequency per a predetermined amount on the basis of an inputted rotational frequency, and an investment amount until an analysis instruction is received when receiving the analysis instruction of a game situation.SELECTED DRAWING: Figure 3

Disclosed herein are methods of preparing a composite from at least a solid elastomer and a wet filler. In one or more mixing steps, the method comprises mixing the at least the solid elastomer and the wet filler to form a mixture and removing at least a portion of the liquid from the mixture by evaporation. One or more rotors of the mixer is mechanically coupled to a mixer motor and at least a portion of the mixing in step (b) is performed under power control in which the rotational speed of the one or more rotors is controlled by a controller that (i) calculates a difference between a measured mixer motor power and a power set point and (ii) adjusts the rotational speed of the one or more rotors if the measured mixer motor power deviates from the power set point.

A refrigeration cycle device (1) is provided with a refrigerant circuit (RC), detection devices (10, 11), and a control device (100). The refrigerant circuit (RC) includes a compressor (2) into which oil capable of dissolving a non-azeotropic refrigerant mixture is placed, a first heat exchanger (4), an expansion valve (5), a second heat exchanger (6), and an accumulator (20). The detection devices (10, 11) detect the composition of the liquid phase in the accumulator (20). The control device (100) uses the detection results from the detection devices (10, 11) to control the rotational speed of the compressor (2) such that the flow rate of the gas refrigerant circulating in the refrigerant circuit (RC) is higher than a zero-rate speed.

The present disclosure relates to a device (1) for laser-radiating a workpiece blank (3) for the production of a workpiece surface with a dimensional accuracy tolerance of below 5 µm, the device (1) comprising: - a rotary system (5) which is configured to clamp a workpiece blank (3) and rotate same at an adjustable rotating speed (ω) about a rotational axis (C), - a laser system (7) which is configured to direct a laser beam (9), pulsed at an adjustable laser pulse rate (f), onto or into a workpiece blank (3) rotated by means of the rotary system (5) and to focus said laser beam such that a laser focus (17) lies at a changeable radial distance (r) to the rotational axis (C) on or in the workpiece blank (3), - a control system (23) which is configured to control the laser focus (17) by changing the radial distance (r) of the laser focus (17) along a programmable radiation profile (21), wherein the control system (23) is further configured to adapt the laser pulse rate (f) of the laser system (7) and the rotational speed (ω) of the rotary system (5) depending on the radial distance (r) of the laser focus (17), wherein in a first range (A) of radial distances (r), the laser pulse rate (f) of the laser system (7) is adapted to the radial distance (r) of the laser focus (17) at preferably constant rotational speed (ω) of the rotary system (5) and in at least one second range (B, C, D, E) of radial distances (r), the rotational speed (ω) of the rotary system (5) is adapted to the radial distance (r) of the laser focus (17) at a preferably constant laser pulse rate (f) of the laser system (7).

The invention relates to a rotational rate sensor and to a method for producing and / or for operating a rotational rate sensor, wherein the rotational rate sensor has a main extension plane with an X direction and a Y direction which runs perpendicularly to the X direction and likewise parallel to the main extension plane, and a Z direction runs perpendicularly to the main extension plane. The rotational rate sensor is configured such that present rotational rates about each of said directions can be detected such that the X direction as well as the Y direction and the Z direction are sensitive directions or axes.

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.

To provide an electric operating machine configured to control rotation of a motor according to operation amounts of an operation part, wherein, such a control characteristic for the motor can be set that the motor can be driven at the maximum rotation rate even if the operation amounts of the operation part are small.SOLUTION: An electric operating machine comprises: a motor; an operation part; a control part for controlling rotation of the motor according to operation amounts of the operation part; and a setting part that can selectively set, as a control characteristic for the motor through the control part, one of preregistered control characteristics. One of the control characteristics that can be set in the setting part is a specific control characteristic such that: a control range in which the rotation rate of the motor reaches the maximum rotation rate from the minimum rotation rate becomes equal to 50% or less of an effective operation range, within the effective operation range in which the motor can be driven by the operation of the operation part.SELECTED DRAWING: Figure 2

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).

To provide a friction stir bonding device that is related to friction stir bonding, measures the temperature of a bonding object material and performs control of a rotational tool and electric heating of the bonding object material on the basis of the temperature of the bonding object material.SOLUTION: There is provided a friction stir bonding device for bonding a bonding object material with a rotational tool by friction in which the temperature of the bonding object material is evaluated from a potential difference between the rotational tool and the bonding object material, at least one of the feed rate and rotational speed of the rotational tool is controlled on the basis of the temperature of the bonding object material, electric heating of the bonding object material is controlled on the basis of the temperature of the bonding object material, a voltmeter for the potential difference measurement and a power supply for the electric heating are connected in parallel in an electrical circuit including the rotational tool and the bonding object material, and the potential difference measurement and the electric heating are performed by switching between the voltmeter and the power supply.SELECTED DRAWING: Figure 2

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.

In one embodiment, an air-scoop includes an air inlet that air molecules enter the air-scoop through at an orbital speed when the air-scoop is moving through an atmosphere at the orbital speed. The air-scoop also includes a rotor that is rotated by a motor at a rotational speed, and the rotor includes multiple rotatable blade stages. A first one of the rotatable blade stages has a blade configuration that maximizes transparency of the first one of the rotatable blade stages to air molecules entering the air-scoop through the air inlet at the orbital speed when the rotor is rotating at the rotational speed. A last one of the rotatable blade stages has a blade configuration that maximizes opacity of the last one of the rotatable blade stages to air molecules in the air-scoop flowing directionally toward the air inlet when the rotor is rotating at the rotational speed.

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.