19 results about "Rotational rate" patented technology

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.

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.

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.

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.

An integrated gear-driven turbomachinery system (200) includes a wheel gear (90) configured to rotate about a rotation axis (R) and at least one pair of pinion shafts (10, 20) mechanically coupled to the wheel gear (90). A first pinion shaft (10) is configured to be mechanically coupled to the wheel gear (90) and to rotate about a first axis (X) parallel to the rotation axis (R) at a first rotational speed, and a second pinion shaft (20) is configured to be mechanically coupled to the first pinion shaft (10) and to rotate about a second axis (Y) at a second rotational speed; the first axis (X) and the second axis (Y) are non-parallel.

The present application provides a sealing device which can stably exert a sealing function even in the case where the rotational speed of a rotating shaft is high. A sealing device (10) is characterized by being a device that seals an annular gap between a rotating shaft (50) and a cover (60) having a shaft hole into which the rotating shaft (50) is inserted, and the sealing device includes: a housing (100) that is fixed with respect to the shaft hole; and a seal ring (200) that is configured to be held on the housing (100) in a state in which movement in a rotational direction is limited inside the housing (100) and separates a high-pressure side (H) that is high in pressure during use of the device and a low-pressure side (L) on the opposite side thereof, the seal ring (200) being provided in a state in which an annular gap is provided between an outer peripheral surface of the rotating shaft (50), and the annular gap being set by a size at which a Lomakin effect is achieved by a fluid pressure of a sealing object fluid that enters from the high-pressure side (H) toward the low-pressure side (L).

This invention discloses a washing device and its control method and apparatus, as well as a computer-readable storage medium. The washing device includes a washing pump and a centrifugal motor. The centrifugal motor drives a filter screen disposed within a washing chamber to rotate. The washing pump controls the circulation of washing water within the washing chamber. The control method includes: acquiring a sampling current of the washing pump; determining the water flow state within the washing chamber and the washing pump's rotational speed error based on the sampling current; determining control parameters for a preset control algorithm based on the water flow state; controlling the rotational speed error using the preset control algorithm based on the control parameters to obtain a rotational speed adjustment amount for the centrifugal motor; and controlling the centrifugal motor based on the rotational speed adjustment amount to adjust the rotational speed of the filter screen. This allows for precise control of the washing device, significantly improving cleaning efficiency and energy efficiency ratio, while also enhancing user experience and system stability.

Robotic surgical systems and methods involve a robotic manipulator, a surgical tool configured to engage and rotate a screw, and a haptic device having an actuator and a manually rotatable interface. Controller(s) receive a control input generated by manual rotation of the rotational interface, the input defining a rotational rate and / or advancement rate of the screw. The controller(s) operate the surgical tool and robotic manipulator to rotate and advance the screw according to the control input. The controller(s) obtain information indicative of an interaction between the screw and the target site, and adjust a force or torque required to rotate the rotational interface based on the information. The adjusted force or torque provides haptic feedback to the operator that emulates the interaction between the screw and the target site.

The invention relates to a method for controlling the operation of an electromechanical actuator, which comprises a step of winding (E100) a screen, from a lowered end-of-travel position of a bar or from a position of the bar located between the lowered end-of-travel position and a breakage position of the arms, and, during the winding step (E100), a first step of controlling (E11) the actuator according to a rotational speed ramp (V) from a first rotational speed setpoint value (V1) of an output shaft of the actuator up to a second rotational speed setpoint value (V2) of the output shaft, strictly greater than the first setpoint value, so as to cross the breakage position of the arms at a rotational speed value (Vc) of the output shaft that is between the first and second setpoint values (V1, V2).

A compressor system includes a compressor housing and a drive shaft rotatably supported within the compressor housing. The compressor system further includes: an impeller that imparts kinetic energy to incoming refrigerant gas upon rotation of the drive shaft; a thrust disk coupled to the drive shaft; and a bearing assembly mounted to the compressor housing. The impeller includes an impeller bore having an inner surface, and the thrust disk includes an outer disk and a hub. The bearing assembly rotatably supports the outer disk of the thrust disk. The hub is disposed within the impeller bore and includes an outer surface that contacts the inner surface of the impeller bore. A first contact force between the outer surface of the hub and the inner surface of the impeller bore increases with increasing rotational speed of the drive shaft.

A HFTO mitigation system may receive torque measurements and vibration measurements for a drill string. A HFTO mitigation system may generate a plurality of frequency modes for the drill string using a physical model of the drill string. A HFTO mitigation system may apply an HFTO model to the torque measurements and the vibration measurements to identify an HFTO mode. A HFTO mitigation system may, when the HFTO mode correlates with one of the plurality of frequency modes, adjust at least one of a weight on bit or a rotational rate of the drill string.

A starting method, starting procedure, and control device for a Francis turbine are provided to maintain impact loads and maximize the impeller's rate of rotation. The starting method for the Francis turbine, implemented to achieve the above objectives, is characterized by comprising: a first step of controlling the opening of guide vanes in minute time units to obtain a modified guide vane opening; a second step of deriving the swirling flow velocity at the modified guide vane opening; a third step of deriving the impeller's circumferential velocity at the modified guide vane opening; a fourth step of deriving the relative velocity of the swirling flow based on the swirling flow velocity and the circumferential velocity; and a fifth step of comparing the relative velocity with a predetermined relative velocity threshold, and determining whether the impeller's rotational speed at the modified guide vane opening reaches a predetermined speed if the relative velocity is below the predetermined relative velocity threshold.

A conveying system having mechanically independent steerable wheel movers and a method of operating the system are disclosed. The method can include directing at least one motor of a steerable wheel mover, with a mover controller, to rotate a wheel of the mover about a wheel axis of rotation at a rotational velocity or to rotate the wheel to a first angular orientation about a steer angle axis. The method can also include detecting a change in at least one operating parameter of the mover after the directing other than the change to the directed rotational velocity of the wheel or to the directed angular orientation of the wheel. The method can also include determining, with a master controller of the conveying system, at least a portion of the mass of a package positioned at least in part on the mover based at least in part on the change detected during the detecting.

The invention relates to a method for calculating and / or estimating the temperature of an eddy current brake (12), in particular a brake drum (20) and / or a brake disc (22) and / or a stator, comprising the following method steps: a) Calculation of a current temperature T akt of excitation coils of the eddy current brake (12) and b) sensorless estimation of the temperature of at least the brake disc (22) from calculated temperature gradients of the excitation coils of the eddy current brake (12) and measured currents I ECB , stresses U ECB and rotational speeds of the eddy current brake (12). Furthermore, the invention relates to the use of the method for temperature determination and / or estimation on eddy current brakes (12).

A washing machine has a tub, a drum configured to be rotatable inside the tub, a weight balancer coupled to the tub, a vibration sensor configured to detect vibration of the tub while the drum is rotating, and at least one processor configured to determine whether a weight balancer is damaged based on a difference between a magnitude of the detected vibration of the tub at a fundamental frequency corresponding to a rotational speed of the drum and a magnitude of the detected vibration of the tub at a harmonic frequency of the fundamental frequency.

A rotary nozzle having a rotating shaft operating within a cylindrical housing is balanced by allowing passage of a small amount of pressurized fluid to be bled to an area between the outside of the opposite end of the shaft and the inside of the housing where the fluid force acts axially in an opposing direction upon the shaft to balance the axial inlet force exerted by the pressurized fluid. The balance of axial forces is self-regulating by controlling escape of the fluid through a tapered or frusto-conical region between the shaft and housing. A plurality of centrifugal weight segments around the inlet end of the shaft are thrust outwardly against the cylindrical housing to retard rotational speed while pressurized fluid around the centrifugal weight segments provides a fluid bearing between the weights and the housing.