214results about How to "Improve torque performance" patented technology

A sensor and guide wire assembly (21; 41) for intravascular measurements of a physiological variable in a living body, comprises a sensor element (22; 42) and a sensor guide wire (23; 43) comprising a core wire (28; 48) and at least one signal transmitting cable (31; 51) connected to the sensor element, wherein a polymer layer (27; 47) is provided which encloses a portion of the core wire and the at least one signal transmitting cable.

Maximizing current from a given power inverter in an electrical rotating machine and maintaining the speed of an electrical rotating machine which has more turns of the winding.

An introducer sheath and a method of manufacturing an introducer sheath. The introducer comprises a first polymeric sleeve having a first striped extrusion arranged in a generally helical pattern along the first sleeve. A second polymeric sleeve is positioned over and bonded to the first polymeric sleeve, the second polymeric sleeve comprising a second striped extrusion that is arranged in a generally helical pattern along the second sleeve. The first and second polymeric sleeves are axially aligned such that the second striped extrusion is superposed over the first striped extrusion to define a generally braid-like configuration. The introducer sheath can optionally include an inner liner disposed within a lumen of the first polymeric sleeve, and / or a coil fitted over the inner liner, such that the first polymeric sleeve is bonded to the inner liner between turns of the coil.

Improved sucker rod joints for down hole petroleum pumping applications are provided within the form factor of standard API sucker rods, such that existing inventory in suitable condition is fully usable in more demanding applications. The pin ends are selected or processed such as to provide preselected axial distance between a flat pin end and at least one reference surface, such as a threaded region or reference shoulder or both. The coupler is dimensioned such that the pin ends are in abutment either with each other or with opposite sides of an intervening torque washer in the central region, when the connection is made to a selected level of thread engagement. Furthermore, the engagement is such as to put the pin ends in compression and the coextensive length of coupler in tension. This increases frictional restraints and locks the elements together to resist fatigue failure upon cycling and to insure together with an anaerobic adhesive sealant, against back threading. This arrangement enables standard quality sucker rods to be employed in a configuration which is mechanically secure and highly resistant to tensile, bending and torsional forces, thus assuring a greater strength at the joint than in the rod itself, and resisting the effects of material fatigue arising from long term and stressful cycling operations.

An intravascular guide wire having two core materials joined together without the use of a connector tube or sleeve, the core materials being stainless steel and pseudoelastic metal alloy, nitinol. The core materials are joined to each other through an intermediate transition piece made essentially of nickel, which is welded on either side to the two core materials. In a multi-segment intravascular guide wire, discrete, high modulus and medium modulus core portions of different materials are welded to a shapeable, low modulus distal core portion made of a third material having a flattened, shapeable section at a most distal end that is not welded to but made from the distal core portion, so the flattened, shapeable section can be deformed to create a steerable tip. Processes such as simultaneous resistance and friction welding can be used to join the core portions.

Hypo-tube based support catheter (1) for treating blood vessels, such as below the knee (BTK) blood vessels and other blood vessels (e.g., coronary, pediatric), which are partially or totally occluded. The tip of the support catheter (1) of the invention is shapeable to any desired shape before the insertion of the device into the blood vessel. The disclosed device enables improved angioplasty treatment of blood vessels, especially with a retrograde approach.

A torque coupling (13) for a rotor head (11) of a rotary-wing aircraft has upper and lower plates (29, 31) configured for rotation with a rotor mast (19). Drive links (33) pivotally connected to the upper and lower plates (29, 31) pivot about a pivot axis generally parallel to and radially offset from an axis of rotation of the plates. Each link (33) is engaged with adjacent drive links (33) to form a continuous ring of links, such that motion of one link (33) about its pivot axis causes motion in an opposite direction of each adjacent link (33) about its pivot axis. Drive elements (25) connect the drive links (33) to an assembly configured to receive rotor blades. The drive elements (25) may be components of a universal joint, a multiple trailing-link configuration, a pad-bearing configuration, or another type of articulating assembly.

Elevator brake or other drag is checked by establishing (10-13) baseline motor currents at plural determined positions as the car is moved up and down both empty and with full load. In a normal run (21), the load is recorded (22) and the motor current required to drive the load at rated speed at the next determined position is both predicted (28) and measured. If the difference between the predicted and actual current exceeds a tolerance (33, 34), the car stops at the next floor (35), the system is shut down (39) and a message generated (40). When the brake is in proper operating condition, baseline motor current required to move a car with the brake engaged is recorded. Thereafter, a high fraction (such as 90%) of baseline motor current is applied to attempt to move the car. If the car moves, the system is shut down (101) and a message generated (102).

The invention discloses a magnetic gear type double-stator hybrid permanent magnet memory motor. The motor comprises an external stator, a rotor and an internal stator which are coaxially arranged and sleeved from outside to inside in turn. The external stator comprises armature iron core teeth, stator yokes and armature windings which are arranged on the armature iron core teeth. The internal stator comprises an internal stator iron core provided with internal slots, neodymium iron boron permanent magnets, aluminum nickel cobalt permanent magnets and pulse magnetic regulating windings which are arranged in the internal slots of the internal stator. The two types of co-excitation permanent magnets are arranged in a "U" shape. The number of single permanent magnets on the internal stator is equal to that of external stator armature teeth. The whole rotor has an annular cup-shaped structure. Rotor iron blocks are fixed in a non-magnetic-conductive epoxy resin sleeve. The rotor iron blocks are connected via magnetic conductive bridges. Disadvantages that a conventional single stator has multiple internal excitation sources which are mutually hindered in space and torque density is relatively low can be solved. Besides, high power density is realized by arrangement of double-stator hybrid permanent magnets, and residual magnetization intensity and magnetization direction of the permanent magnets are regulated by applying pulse current so that motor magnetic field high-efficiency regulation is realized, and rotating speed operation range is enhanced.

A torque tube assembly includes a hollow composite member and an end fitting. The composite member has at least one end portion divided into a forward section and an aft section. The forward section is disposed adjacent a free end of the composite member. Each one of the forward and aft sections has at least one lobe extending radially outwardly along a lobe axis. The lobe axis of the forward section is preferably angularly offset from the lobe axis of the aft section. The end fitting is formed complementary to the composite member and is at least partially enclosed by the forward and aft sections.

The invention discloses a torque ripple weakening method for a concentrated winding outer rotor magnetic field modulation motor, and the method employs a method of building a target function to adjusta modulation polar coefficient combination and rotor axial segmentation for inhibition for main odd harmonics and even harmonics in the counter electromotive force of the motor. According to the method, the reduction of motor torque ripple is taken as an objective function, and an optimal modulation polar coefficient combination is obtained through a method of combining analytical calculation anda finite element method so as to suppress the influence of main odd harmonics. A rotor of the concentrated winding magnetic field modulation motor is divided into two sections in the axial direction,permanent magnets of the two sections are magnetized with N polarity and S polarity respectively, and the upper permanent magnet and the lower permanent magnet are arranged in a staggered mode by thedistance of one pole so as to restrain the influence of even harmonics. The torque ripple suppression method is easy to operate and obvious in effect, and the concentrated winding outer rotor magnetic field modulation motor has the advantages of being high in torque density and low in torque ripple.

An open end ratchet wrench is defined with a gap which allows the ratchet wrench to pass through a pipe or obstacle to carry out rotation, thus improving the operability and convenience of the wrench. Both ends of the open end ratchet wrench extend outward to form a stopping piece, respectively. The stopping pieces allow the toothed pawl to be well positioned and prevent it from disengaging, thus maintaining a stable torque and making the ratchet wrench easy to use.