261 results about "Rotational rate" patented technology

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.

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.

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.

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.

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.

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.

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.

A slip control method, comprising: first, when a vehicle is in a driving condition of a launch control execution stage, acquiring the wheel speed of each wheel of the vehicle; then, determining a slip condition of the vehicle according to the wheel speed of each wheel, acquiring motor operation parameters of the vehicle, and determining the slip output torque of the vehicle according to the slip condition of the vehicle and the motor operation parameters; and finally, adjusting the actual output torque of the vehicle according to the slip output torque, and controlling a motor to operate at the adjusted actual output torque. In the slip control method, since a rate of change of the rotating speed of the motor is not used as a reference factor of the slip output torque, the calculated slip output torque is not impacted by the rate of change of the rotating speed of the motor and a calculation result is more accurate. Furthermore, during the process of a user starting a launch control function, the driving experience and ride comfort of the vehicle can be effectively improved. Also provided are a slip control apparatus, an electronic device executing the slip control method, and a storage medium.

The present invention provides a motor control method, which includes: a step of calculating an ideal position of a motor rotor based on a Hall sensor signal; a step of calculating a current position of the motor rotor based on a rotation speed of the motor rotor; and a step of calculating a difference between the ideal position of the motor rotor and the current position of the motor rotor as a Hall sensor deflection angle.

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.

Controlling a hydraulic drive for a hydraulic consumer alternately pressurized in opposite directions, the hydraulic drive comprising a hydraulic machine driven by an electric machine and featuring variable displacement adjustable through zero, wherein a rotational speed of the hydraulic machine controlled by the electric machine, includes varying displacement so that conveying direction of hydraulic fluid is alternated using a cyclically varying volumetric flow specification, to perform direction reversals. After direction reversal during a first change time period, the rotational speed is increased from a first rotational speed set at the end of the direction reversal to a second rotational speed, and within a second change time period after the first change time period, the rotational speed is decreased until the first rotational speed is reached. The displacement is varied during the change time periods depending on the rotational speed and volumetric flow specification to comply with the volumetric flow specification.

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

To provide an image-forming device capable of stably controlling a motor.SOLUTION: An image-forming device includes: a winding shaft 410 for winding a seal member 404; a stepping motor 300 for exclusively driving a development sleeve 403 and the winding shaft 410; and a system controller 200 for setting a target rotational speed of the stepping motor 300 to a first target rotational speed when winding the seal member 404, and setting the target rotational speed to a second target rotational speed higher than the first target rotational speed at the time of image-forming processing. The system controller 200 sets a first allowable rotational speed range showing an allowable range of a first error between the first target rotational speed and a rotational speed of the stepping motor 300 at the time of winding processing wider than a second allowable rotational speed range showing an allowable range of a second error between the second target rotational speed and a rotational speed of the stepping motor 300 at the time of image-forming processing.SELECTED DRAWING: Figure 5

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).

The present disclosure provides a propulsion assembly for mounting on an aircraft platform, the propulsion assembly configured to generate thrust and enable controllable accelerated inflow and outflow of a mass flow of air. The propulsion assembly includes one or more fluid-based rotary actuators or motors in fluid communication with a source of active / pressurized working fluid, driving the one or more fluid-based rotary actuators by receiving the active working fluid. The propulsion assembly further comprises one or more actuator disk devices, each including a plurality of blades rotatable by one or more fluid-based rotary actuators. The valve mechanism of the propulsion assembly is disposed along a flow path between the source of active working fluid and the one or more fluid-based rotary actuators. The propulsion assembly further comprises at least one processing circuit and one or more memories connected to the at least one processing circuit and storing programming instructions executed by the at least one processing circuit, (1) the at least one processing circuit executing the programming instructions to control the valve mechanism so as to effect at least one of (i) a selected flow rate of the active working fluid within the one or more fluid-based rotary actuators or the active working fluid received by the one or more fluid-based rotary actuators, (ii) a selected fluid pressure, and (iii) a selected temperature. This configuration of the propulsion assembly enables control of the instantaneous angular acceleration and rotational speed of the motor, and thus enables control of the rotational movement of the actuator disk device.

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.

To suppress collapse of the shape of a holder when molding the holding and when inserting a ball into a pocket, while suppressing deformation of the holder due to centrifugal force.SOLUTION: In a ball bearing used under an environment where a dmn value, defined by the following formula, is 900,000 or larger: dmn={(D+d) / 2}×n, where D is an outer diameter (mm) of an outward member 4, d is an inner diameter (mm) of an inward member 3, and n is a rotational speed (min-1), a holder 10 for holding balls 5 is a crown-type holder comprising an annular base part 11 and a plurality of pockets 20 formed along a circumferential direction on one axial side of the base part 11, where a minimum axial thickness t of the base part 11 at a bottom part 22 on the other axial side of the pockets 20 satisfies the following relation: 0.06Da≤t≤0.22Da, where Da is a diameter of the balls 5.SELECTED DRAWING: Figure 1

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.

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.