779 results about "Constant torque" patented technology

An adjustable headrest that provides both support and comfort to the user and one that can be used in connection with furniture including household and office furniture and also in connection with various types of passenger vehicles. The headrest includes slide means for permitting easy height adjustment of the headrest and also includes locking means for securely locking the headrest in a desired elevated position. Further, the headrest includes easily adjustable, wing-like, side-support members that are pivotally connected to a centrally located, vertically adjustable head support member by means of constant torque hinges and also includes easily adjustable chin support members that are pivotally connected to the side support members by means of constant torque hinges.

Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator. A drive is connected to the phase windings for energizing the windings. A controller outputs a control signal to the drive in response to an input demand such as a demanded speed or torque. Control methods (which can be implemented separately or in combination) include varying the gain of an estimator as a function of a demanded or estimated speed to position control system poles at desired locations, decoupling control system currents to achieve a constant torque with motor speed, compensating flux estimates of the estimator for saturation operation of the stator, estimating rotor position using averages of sample values of energization feedback, and calculating a trim adjusted speed error from a plurality of speed estimates.

A drive shaft assembly for a downhole motor includes a drive shaft formed with convexly spherical bearing surfaces on each end, and end housings with concavely spherical bearing surfaces for mating contact with the spherical bearing surfaces of the drive shaft, thereby facilitating omni-directional articulation between the drive shaft and the end housings while transferring axial thrust loads between the drive shaft and end housings across the interface of the mating spherical bearing surfaces. Torque is transferred between the drive shaft and end housings through two or alternatively four swivelling drive keys mounted to each end of the drive shaft and engageable with complementary drive key slots in the end housings. Full and constant torque-transferring contact is thus provided between the swivelling drive keys and the end housings irrespective of any angular offset between the drive shaft and the end housings, resulting from omni-directional articulation of the drive shaft relative to the end housing. The omni-directional center of rotation at each end of the drive shaft coincides with the geometric centerpoint of the corresponding convexly spherical bearing surface, which corresponds to the intersection of the drive shaft's rotational axis, the end housing's rotational axis, and the drive key swivel axis.

A locating device for slide joint is mounted to an inner member provided with at least one locating hole and an outer member provided with a through hole and slidably fitted on the inner member. The locating device includes a mounting seat mounted on the outer member; a pushbutton pivotally connected to the mounting seat and having an engaging section located at an end thereof; a torsion spring arranged between the pushbutton and the mounting seat to apply a constant torque on the pushbutton; and a locating rod having two spaced annular ribs. The engaging section of the pushbutton is located between the two annular ribs to selectively press against one of the two inner annular ribs under the torque of the torsion spring. The locating rod has an inner end extended through the through hole on the outer member to insert into the locating hole on the inner member.

A control apparatus for a vehicle is provided with an electric motor that outputs driving force for running the vehicle; an automatic transmission that establishes a plurality of gears by selectively applying and releasing a plurality of friction apply elements in a predetermined combination for each gear among the plurality of gears, and transmits power from the electric motor to an output shaft of the vehicle; and a torque controlling portion which, when there is a demand for a power-off downshift, controls output torque of the electric motor such that input torque of the automatic transmission becomes constant torque during an inertia phase of that shift, and controls the output torque of the electric motor such that the output torque of the automatic transmission comes to match the torque required after the shift, after rotation synchronization by an apply-side friction apply element is complete.

An adjustable headrest for use with furniture and vehicle seats that includes novel slide mechanisms for permitting easy vertical and horizontal adjustments of the headrest relative to the seat. The headrest also includes wing-like side support members that are pivotally connected to horizontally adjustable slide mechanisms by constant torque hinges. Additionally, the headrest includes a mechanism for permitting pivotal movement of the entire headrest relative to the seat connector which connects the headrest to the seat.

An electrically powered driveline assembly includes a first electric motor and a second electric motor that drive corresponding input shafts to drive an output shaft. The first and second electric motors are selectively coupled to facilitate constant torque and speed output of the output shaft during shifting and also in the event of failure of one of the electric motors.

Methods and apparatus for controlling the tension of one continuous material (e.g., plastic zipper) with attachments or formed features (e.g., sliders or formed slider end stops) as it is fed to a sealing station, where it is joined to and later pulled by another continuous material (e.g., packaging film). The tension control scheme can be applied in cases wherein the packaging film advances a single package length per advancement as well as cases wherein the packaging film advances a distance equal to multiple package lengths per advancement. A tension control zone is created between a pair of nip rollers disposed in zipper processing equipment and a zipper sealing station inside a thermoforming packaging machine by applying a predetermined torque to one of the nip rollers using a torque control device. The zipper processing equipment may comprise a zipper shaping station and a slider insertion station. The torque control device applies a substantially constant torque that maintains the zipper tension substantially constant in the tension control zone, especially during zipper stomping, slider insertion and zipper sealing.

The present invention is a high voltage synch motor digitalized vector control device which comprises a high voltage input dephasing isolating transformer and a power unit module that is provided with energy feedback. The two units are connected in series to form a three-phase high voltage variable frequency output. The present invention also consists of a digital processor, a programmable logic component, a digital high voltage synchronous machine vector controller that is formed by relative surrounding circuit, a rotor position and speed feedback encoder that is connected with the controlled synchronous motor with the same axle and a monitor transducer of the output current of the frequency changer; the surrounding circuit consists of an optical fiber connector and an upper monitor system that gives frequency. The present invention has the advantages of less pollution to the grid, needless of reactive-load compensation equipment, fast response, wide range of speed regulation ratio, actuated by constant torque and quadrant operating power.

The invention discloses a motor test system for an electric vehicle, and solves the problems that a motor test system in the prior art can not meet neither constant-torque loading when an electric vehicle motor runs below the rated rotational speed nor constant-power loading when the electric vehicle motor runs above the rated rotational speed. The motor test system comprises a tested-motor controller connected with a tested motor and used for controlling the state of the tested motor simulating the operation of the electric vehicle, an AC power dynamometer connected with the output terminal of the shaft of the tested motor and used for providing a load for the tested motor and the controller so as to simulate the required power output during actual operation of the electric vehicle, a dynamometer controller connected with the dynamometer and used for controlling the dynamometer to provide a resisting force for both the tested motor and the tested-motor controller when the tested motor simulates the operation of the electric vehicle, and a rotational speed and torque sensor connected with the output shaft of the tested motor and used for measuring both the rotational speed and the torque of the tested motor. The motor test system can improve the accuracy in testing the electric vehicle motor.

The invention discloses a surface-mounted permanent magnet synchronous generator flux weakening control method, belonging to the PMSM control technical field. The method employs a current regulator to provide a direct-axis voltage when a motor rotating speed is higher than a base speed, thereby allowing a motor to move along the intersection between a voltage horicycle and a constant torque curve. The method allows a current locus to meet a torque curve, and meanwhile to meet voltage and current restriction; an output direct current voltage can rapidly recover stability after short fluctuation, and possesses sound dynamic response.

The invention discloses a power generation control method for an extended-range electric vehicle. The power generation control method includes acquiring generated power of the integral vehicle and dissolving the generated power of the integral vehicle into a target rotation speed and target torque; controlling a power generator to start a rotation speed mode according to the target rotation speed and simultaneously controlling an engine to output constant torque; acquiring the rotation speed of the power generator in real time, and controlling the engine to output the target torque when the rotation speed of the power generator reaches the target rotation speed; controlling the engine and the power generator to stop running when a situation that the quantity of electricity of a power battery meets preset conditions or the power battery is charged by an external power source is detected. The invention further discloses the extended-range electric vehicle and a vehicle control unit and a power generation control system of the extended-range electric vehicle. The power generation control method, the extended-range electric vehicle, the vehicle control unit and the power generation control system have the advantages that the rotation speed of the power generator is controlled in a closed-loop manner by the power generation control method, so that power generation of the extended-range electric vehicle is controlled, the problem of slow response speed of an existing engine is solved, and problems of high generated power fluctuation and low economical efficiency and stability of an existing integral vehicle due to closed-loop control for the rotation speed of the existing engine are solved.

The invention discloses an elevator frequency converter IGBT over-temperature closed loop protection method based on switching frequency adjustment. The elevator frequency converter IGBT over-temperature closed loop protection method comprises the steps that firstly, IGBT junction resistance is detected; secondly, IGBT junction temperature is worked out; thirdly, switching frequency is adjusted. According to the elevator frequency converter IGBT over-temperature closed loop protection method, the IGBT junction resistance is directly detected, the junction temperature is accurately worked out for an NPC three-level frequency converter, and the IGBT internal temperature can be reflected more truly; a temperature closed loop is manufactured, through adjustment of the IGBT switching frequency, the IGBT temperature of a rectifier and the IGBT temperature of an inverter are adjusted independently and dynamically in real time so that the rectifier and the inverter can work in a safe temperature range, the frequency converter is controlled to enable the rotation speed of an elevator to be reduced and guarantee constant torque, and then a system is in a low-speed stable operation stage; the junction temperature is displayed visibly, so that operation personnel make judgments and execute corresponding operation conveniently; the real temperature of an IGBT chip can be accurately detected, and non-shutdown protection can also be conducted.