60results about How to "Reduce load torque" patented technology

The invention provides a seven-degree-of-freedom series-parallel hybrid mechanical arm. The seven-degree-of-freedom series-parallel hybrid mechanical arm comprises a base, a first joint, a first link,a second joint, a connection support, a third joint, a second link, a fourth joint, a fifth link, a fifth joint, a sixth joint, a sixth link, a seventh joint and an end executer connection flange which are sequentially connected, wherein a third link and a fourth link are further arranged between the third joint and the fourth joint, one end of the fourth link is connected with the fourth joint,the other end of the fourth link is connected with the third link, and the third link is connected with a motor shell body of the fourth joint; the third link, the fourth link, the fourth joint and the second link form a parallel four-link transmission mechanism; and the axis of the third joint, the axis of the fourth joint and the axis of the fifth joint are mutually parallel. The new configuration of the seven-degree-of-freedom series-parallel hybrid mechanical arm is high in operation flexibility in a common reachable range of a main movement space; and meanwhile, the load torque of the motor in the vicinity of the base is reduced, and the rotational inertia of the whole mechanical arm is reduced.

A bearing apparatus includes a rotator body, a non-rotation body rotatably supporting the rotator body, and a lubrication fluid provided between the rotator body and the non-rotation body in which the rotator body is supported in a thrust direction by a thrust dynamic pressure bearing formed between the rotator body and the non-rotation body. The bearing apparatus includes an active magnetic bearing formed by a driving coil disposed on one of the rotator body and the non-rotation body and a magnet disposed on the other thereof, and a gap sensor that detects an axial direction gap between the rotator body and the non-rotation body. The thrust dynamic pressure bearing and the active magnetic bearing are combined such that the static rigidity of the bearing apparatus is born by the active magnetic bearing and the dynamic rigidity is born by the dynamic pressure bearing.

The present invention relates to a motor control method for a dental handpiece provided with a motor that rotationally drives a cutting tool. The control method includes a step A of limiting the motor current to a first limit current I1 when the load torque applied to the cutting tool exceeds a preset limit torque value, and a step B of controlling the motor current to be equal to or lower than a second limit current, which is lower than the first limit current, when it is detected that the motor stops rotating.

The invention provides a foreign matter removing device of roller, which can be rotarily mounted with a bidirectional scratch board, wherein only one side of the bidirectional scratch board is contacted to the roller surface regardless the rotary direction of the roller, so that the foreign matter removing device can reliably remove the foreign matter on the surface of the roller and can reduce the load torque.

Electronic pipette with a displacement device, an electric drive motor with a drive shaft, a gear mechanism coupled on the one hand to the displacement device and on the other hand to the drive shaft, a magnetic disc rotationally coupled to the drive shaft with at least one magnetic pole on the circumference, at least one magnetic sensor aligned with the circumference of the magnetic disc, at least one additional magnet aligned with the circumference of the magnetic disc, an electronic control device electrically connected to the electric drive motor and the magnetic sensor and an electric voltage supply connected to the electronic control device.

The invention provides a bi-directional rotary pump, which can form large flow when controlling flow, and can reduce load torque exerting on the electric engine when controlling pressure, making the electric engine miniaturization and with higher efficiency than the existing bi-directional rotary pump. The volume-variable bi-directional rotary pump includes a bi-directional rotary pump mechanism, a volume-variable mechanism for carrying out mechanical modification based on the increase and decrease of the control pressure acting on the press part, which causes the discharge volume for rotating per unit of the pump mechanism to change; a change-over valve, forming the first loop connection for reducing said control pressure, connecting the press part with low press side loop, when making the volume-variable mechanism modify to the large volume, at the same time the second loop connection is formed for guiding the discharge pressure of said pump mechanism itself as control pressure, when making the volume-variable mechanism modify to the small volume.

An impeller for a centrifugal pump comprising a boss supported by a rotation shaft of a motor so as to be rotatable as a unit with the rotation shaft; and a plurality of blades that extend from the boss towards a radial direction outside of the boss, and that discharge liquid towards a leading end side thereof by rotating; wherein each blade comprises one side face that is a face on a first side in a rotation direction of the impeller and includes a projecting face that projects from a base end portion at a boss side of the one side face towards the first side in the rotation direction with respect to a line that connects the base end portion and a center of rotation of the blades.

An image forming apparatus has an abutment roller which is provided at either end of a developing sleeve in a longitudinal direction and makes an SD gap (Gsd) between a photosensitive drum and a developing sleeve constant, an abutment block which is provided at either end of the photosensitive drum in a longitudinal direction and on which the abutment roller abuts, and a pressing spring which directly presses the abutment roller toward the abutment block. The stability of the SD gap (Gsd) and reduction of the driving load torque of the developing sleeve can be achieved to cope with both high image quality and durability of the image forming apparatus.

A stall recovery system for a ram air turbine (RAT) that supplements the operation of a volume fuse in the hydraulic system of the RAT by sensing a stall condition as the combination of low pressure at less than maximum flow and reducing RAT load torque after the sensed stall so that stall recovery is possible.

The invention relates to the technical field of fluid transmission and control digitization, in particular to a rotor valve core of a hydraulic 1D digital rotary valve, which is characterized by comprising a mandrel, a motor stator and an angular displacement sensor, one part of the core shaft is a motor rotor shaft, the other part of the core shaft is provided with a valve hole, the surface of the core shaft at the valve hole is provided with a plurality of grooves, the motor rotor shaft is coaxially matched with the motor stator, and the valve hole is matched with the valve sleeve; after the valve hole is matched with the valve sleeve, any logic control valve circuit of a two-position two-way valve core, a two-position three-way valve core, a two-position four-way valve core or a three-position four-way valve core is formed; the mandrel and the motor stator can form any one structure of a servo motor, a servo stepping motor or a rotary electromagnet, and digital control is achieved under the action of a control system. Compared with the prior art, the driving motor rotor and the rotor valve element are of an integrated structure, the structure is compact, the size and the weight are reduced, the assembly process is simplified, and the control precision and the response speed are improved.

The invention belongs to antenna tilt balancing parts, and particularly relates to an antenna tilt balancing part, a balancing bracket and a balancing mechanism containing the antenna tilt balancing part. The balancing mechanism includes the U-shaped balancing bracket, and the antenna tilt balancing part is arranged on the balancing bracket; the antenna tilt balancing part includes a shell, an anti-torque spring, an anti-torque shaft and a bearing, the outer ring of the bearing is fixedly connected with the inner wall of the shell, one end portion of the anti-torque shaft penetrates through the inner ring of the bearing and is connected with the other end of the anti-torque spring, and the other end portion of the anti-torque shaft extends to the exterior of the shell. Through adoption ofa tilt balancing device, eccentric torque generated on the anti-torque shaft by the surface of an antenna under the gravity effect can be overcome, stress performed on the surface of the antenna is balanced, the loaded torque of a motor is reduced, and therefore a tilt motor on the surface of the antenna can drive the surface of the antenna to rotate around a tilt axis under low power to achieve required speed and accelerated speed, so that required accuracy is achieved, not only is the cost saved, but also the weight and size of the overall machine are reduced, and the demands of design and application can be met.

A slag remover for discharging combustion residues of an incineration plant comprises a trough, which has a trough housing having two side walls, which define the trough width, and having a trough bottom, and which is intended to collect the combustion residues evacuated from a combustion chamber of the incineration plant. The trough further comprises at least two push rams for pushing the combustion residues out of the trough, and a shaft rotatably mounted in two shaft bearings and on which at least one drive lever cooperating with a cylinder-piston unit and at least two output levers connected to respectively one of the push rams are disposed in a rotationally secure manner. The cylinder-piston unit is here designed such that the push rams move back and forth between a retracted position and an extended position. The drive lever is disposed between two output levers.

The invention discloses a lower limb exoskeleton with variable-axis knee joints. The lower limb exoskeleton comprises a backpack module, a left part and a right part, wherein the left part and the right part have the same structure and are symmetrically mounted at the lower part of the backpack module; the left part comprises a hip joint module, a thigh module, a knee joint module, a shank module,an ankle joint module, a foot module, a rear linkage and an energy storage module; each knee joint module comprises a knee joint upper linkage, a knee joint rear linkage, a knee joint lower linkage,a knee joint left rocker and a knee joint right rocker. The exoskeleton selects the variable-axis knee joints as the knee joint modules, so that not only is the single degree-of-freedom requirement ofhuman knee joints met, but also an instantaneous center of rotation can be variable by means of optimization of structural design and size parameters of the knee joint modules, centrode of the knee joint lower linkages relative to the knee joint upper linkages is close to theoretical centrode of the human knee joints, and coordination of the exoskeleton and human legs is improved.

A variable-speed drive system includes a driven machine mechanically coupled to a drive machine by a transmission unit. At least two regulating machines are mechanically coupled to the transmission unit and operated by at least two frequency converters. At least one of the at least two frequency converters is electrically connected to the drive machine by a changeover device, wherein a connection of the drive machine to at least one electric supply network is at least temporarily disconnectable to produce a controlled speed change on the drive machine.