1711 results about "Electromagnetic brake" patented technology

An automatic door opener (10) for opening or closing a door (28) includes a motor (14) driving a drive shaft (50) and an opener arm (18) connected to the door (28) and being responsive to rotation of the drive shaft (50) for moving the door (28) to an open or closed position. A clutch (46) operable to disengage the drive shaft (50) from the opener arm (18) is provided in the event of the door (28) engaging an obstacle, electric power being unavailable, or the door being fully open or fully closed. The door opener (10) may also include a brake (48) for selectively preventing movement of the door (28). Various embodiments of the invention are provided, including an electromagnetic clutch (80) and an electromagnetic brake (114).

The frame 9 is mounted on the ceiling 3 of the transportation, on which the liquid crystal panel 7 is stowed in such a manner as the surface of the liquid crystal faces to the ceiling, and when the liquid crystal panel positions for displaying, it is turned by approximately 120 degrees by the drive mechanism 19, so that the passenger sitting at the seat can easily watch it. The driving of the liquid crystal panel from the stowing position to the displaying position is carried out by the motor, the displacing from the displaying position to the stowing position is carried out by the spring. When the liquid crystal panel receives a shock by the collision of a head of passenger during displaying, the detecting device may detect the deviation of the liquid crystal panel and transmit the signal to the control circuit 44. The control circuit 44 returns the liquid crystal panel 7 to the stowing position by releasing the electromagnetic brake.

An electromagnetic brake, including an electromagnetic brake actuator coil surrounding a power input shaft for a multiple-ratio transmission in a vehicle powertrain, is disclosed. An electromagnetic flux flow path for the actuator coil is electromagnetically isolated from the power input shaft and other elements of the powertrain thereby avoiding residual magnetization.

In a preferred embodiment, a linear / rotary electromagnetic device, including: a housing (20); first and second stators (22 and 40) disposed in the housing, first and second rotors (24 / 26 and 42 / 44) disposed in the housing and magnetically interacting, respectively, with the first and second stators; the first stator and the first rotor comprising a rotary motor; the second stator and the second rotor comprising an electromagnetic brake; a shaft (28) extending through a portion of the housing and axially through the first and second rotors, the shaft having a threaded portion (50) extending through a complementary threaded portion (44) of one of the first and second rotors; whereby; when the electromagnetic brake is locked and the rotary motor is rotated in a first direction, the shaft will move axially in a first direction; when the electromagnetic brake is locked and the rotary motor is rotated in the second direction, the shaft will move axially in a second direction; and when the electromagnetic brake is released and the rotary motor is rotated, the shaft will rotate with the rotary motor.

The present invention relates to an stormproof billboard and control method thereof, which includes a column, a billboard stent, a rotating element, a motor, an electromagnetic brake, an anemoscope, a trigger switch, and an electric control assembly, wherein the control element respectively connects with the electromagnetic brake, the motor and the trigger switch, the electric control assembly controls the work of the motor and the electromagnetic brake by the wind speed signal measured by the anemoscope and the signal of the trigger switch. By using above structure, the invention can change the windward section of the stormproof billboard by the wind speed and the wind direction, such that effectively reduces the wind load, makes the stormproof billboard more secure in use. The invention is easy to control and secure to use, makes the advertisement have a good effect, it is worth to use the stormproof billboard.

A two speed transmission and belt drive system utilizing the transmission. The two speed transmission comprises a planetary gear train comprising an input pulley connected to an input carrier, and a sun gear and a ring gear. The input carrier also comprises a plurality of planetary gears disposed between the sun gear and the ring gear. The sun gear is engaged with an electromagnetic brake member. The ring gear is engaged with an output pulley. A one-way clutch is disposed between the input carrier and the output shaft. The brake member is engaged at engine idle and is disengaged at engine speeds above idle. When the brake member is engaged the sun gear does not rotate, thereby driving the ring gear and output pulley at a greater speed than the input pulley. An accessory pulley operates with the transmission output pulley resulting in an accessory speed that is proportional to an engine speed at idle. At engine speeds above idle the transmission is disengaged and the output pulley to accessory pulley ratio drives the belt driven accessory at a speed less then an engine speed. An accessory can also be directly connected to the output shaft in conjunction with the output pulley. The transmission can be used with a motor generator system by providing a speed reducing unit disposed between an engine and the motor generator.

A torque-coupling device comprising a hydraulically actuated friction clutch pack and a gerotor pump provided for generating hydraulic pressure actuating the friction clutch pack. The gerotor pump is selectively actuated by a device external to the gerotor pump and the friction clutch pack, such as an electric motor, friction brake, electro-magnetic clutch, friction mechanism utilizing a magneto-rheological fluid, electro-magnetic brake, etc. The externally driven gerotor pump may be further provided with torque-multiplication gearing, and / or an electronic controller to modulate the actuation of the pump in order to provide flexible control of the hydraulic pressure generated by the gerotor pump.

The invention discloses an automatic spiral hole-milling unit comprising a cutter rotation system, a radial deflection system, a revolution system and a sleeve with an inner hole. The axis of the inner hole of the sleeve is eccentrically arranged relative to the axis of an outer circumference of the sleeve. A stand is connected outside the sleeve. The cutter rotation system comprises a drive unit with a cylindrical shell. The drive unit can be rotatably arranged inside the inner hole of the sleeve. An output shaft of the drive unit is connected with a clamping apparatus holding a cutter. The output shaft of the drive unit is in offset arrangement relative to the axis of the shell of the drive unit. The radial deflection system comprises a stepping motor with an electromagnetic brake. A flange of the stepping motor is fixedly connected with the sleeve, and an output shaft of the stepping motor is fixedly connected with the shell of the drive unit coaxially. The revolution system comprises an electric rotating motor; the inner ring of the electric rotating motor is fixedly connected on the sleeve, and the outer ring of the electric rotating motor is fixed on the frame. When used for processing of high-strength materials difficult to cut and process, the automatic spiral hole-milling unit obviously improves the processing efficiency and the processing quality.

A conveyor roller (10) has a cover (20), an axle (40), and a magnetic brake (50) having a magnetic component (51) and a braking component (54). The cover (20) is supported rotatably about an axis of rotation relative to the axle (40). The magnetic brake (50) is provided kinematically between the axle (40) and the cover (20) and is connected to the axle (40) and the cover (20) so that rotation of the cover (20) about the axis of rotation can be retarded by the magnetic brake (50). The magnetic component (51) and the braking component (54) are arranged displaceably relative to each other between a rest position and a braking position. A centrifugal device (60) for a rotational speed-dependent displacement of at least one of the magnetic brake components (51, 54) is provided between the rest position and the braking position.

A haptic input apparatus includes: a supporting member having a spherical bearing; a lever handle having a spherical portion to be supported by the spherical bearing; an electromagnetic coil arranged opposite to a lower end surface of the lever handle; detection means for detecting an operating state of the lever handle; and control means for taking in an output signal a from the detection means to output a driving signal b of the electromagnetic coil based on the output signal a. The control means reads outs a control signal c from the electromagnetic coil corresponding to an output signal a to be inputted from the detection means from a first storage to output to a first driver circuit. The first driver circuit D / A converts the control signal c outputted from the CPU for amplifying, and outputs a driving signal b from the electromagnetic coil.

A multi-joint fixture including a proximal base unit, one or more arms serially connected by electromagnetically lockable ball joints, and a distal hub. The ball joints unlock when not powered. A centering mechanism biases the ball joints toward a neutral position. A control system activates the electromagnetic brake with a high-then-low voltage profile. A headpiece attaches to the hub and holds a drape that covers the fixture. A connector connects a surgical device to the headpiece. A switch on the hub can be actuated via actuators on the headpiece or connector.

The invention relates to a tied rope contracting and releasing device, in particular to a tied rope contracting and releasing device with controllable tension, controllable contracting and releasing length and a measurable wire inlet posture angle. The tied rope contracting and releasing device comprises a servo motor, a wire reel, a servo motor driver, a guide wheel vertical plate, a meter, a tension sensor, a tension adjuster, an angle measurement fixing rack, a bottom plate, a motor encoder, an electromagnetic brake, a speed reducer, a motor fixing rack, a gear key, a mounting ear and the like.

The invention discloses a rehabilitation training robot for lower limbs, and aims to provide a rehabilitation training robot which is simple in structure, easy to process and compact in structure of each joint driving device. The key point of the technical scheme comprises a driving device for ankle joints, a driving device for knee joints and a driving device for hip joints; and a shank part and a thigh part are telescopic to adapt patients with different heights. The driving device for the knee joints is placed at the rear end behind a thigh rotating joint and is used as a counter weight for balancing the weight of a movement part of the robot; and the driving device for the hip joints is placed on a base and does not participate in the movement of the robot, so that the weight of the movement part of the robot is greatly reduced. The driving of the joints is realized by a motor through a reducer; and a moment (force) sensor is arranged, and an absolute position encoder and an electromagnetic brake are arranged on the knee joints and the hip joints. The rehabilitation training robot is mainly used for performing passive training, active training or assisted training on the patients with lower limb disability.

An electrically operated parking brake apparatus that includes an electric motor and a screw mechanism The screw mechanism includes a screw-threaded shaft adapted to be rotationally driven by the electric motor, and a nut member meshing with the screw-threaded shaft, the nut member being movable along the screw-threaded shaft by the rotation of the screw-threaded shaft. The parking brake apparatus also includes a transmission member connected to the nut member for transmitting a brake operating force to a wheel brake, and a rotation preventing unit for preventing the rotation of the screw-threaded shaft so as to hold the brake operating force by fixing the position of the nut member relative to the screw-threaded shaft. The rotation preventing unit in one embodiment is an electromagnetic brake for confining the screw-threaded shaft to a stationary portion of a vehicle body.

The invention relates to a crane with a brake failure protection device and a brake failure protection method, belonging to the filed of electromechanical integration and solving the problems of over complicated structure and low reliability of a traditional mechanical device for preventing the brake slip of the crane. The crane with the brake failure protection device comprises a main controller, a transducer, a lifting mechanism induction motor, a photoelectric encoder, a brake, a speed reducer of a mechanical transmission type, a drum, a hook, a signal converter and a high-speed interface module. Whether a lifting mechanism moves or not is detected by the photoelectric encoder when the lifting mechanism is braked by the brake, the brake fails if a signal is output by the photoelectric encoder, and the transducer is controlled by the main controller module to work and drive the lifting mechanism induction motor to generate electromagnetic torque for realizing electromagnetic brake so that a load is slowly put in a suitable position and a brake failure alarm signal is sent. The invention is used for the failure protection of the crane brake.

The invention discloses a synchronous control circuit for rail-vehicle-rescue emergency braking. Normally-closed contact coupling a relay and emergency braking relays are parallelly connected into emergency-braking train-line loops of lead vehicles of rescue vehicles and failed vehicles, and are used for rebuilding the emergency-braking train-line loops after rescue trains and failed trains are coupled; meanwhile, braking isolating switches are arranged on the lead vehicles of the rescue vehicles and the failed vehicles, rescue head-and-tail relays and braking isolating relays are parallelly connected, emergency-braking-button normally-closed contact of a driver table is connected into the emergency-braking train-line loops in a series mode, braking isolating electromagnetic valves of all the vehicles are parallelly connected into an emergency train-line loop, power is supplied through the emergency train-line loop, the emergency train-line loop is controlled to control the braking isolating electromagnetic valves, and under the working condition that rescue is achieved, emergency-braking synchronous control is achieved. A control method is safe and reliable, the synchronism is accurate, the purchasing expense of a whole project is saved more than 3-million yuan, device installation space is saved, and installation space and maintaining space are guaranteed for full power vehicles and unmanned driving vehicles.

The invention provides an electromagnetic and friction integrated brake system and a control method thereof. The electromagnetic and friction integrated brake system comprises a friction brake, an electromagnetic brake, a permanent magnet generator, a vehicle-mounted battery and an integrated controller. The inside friction disk and the outside friction disk of the disk-type friction brake are manufactured separately and connected by use of a bolt. The electromagnetic brake is of a rotary drum type and composed of an electromagnetic brake stator and a rotor for generating electrical vortex; the electromagnetic brake stator is located between the inside friction disk and the outside friction disk and fixedly connected with a steering joint support or suspension. The permanent magnet generator is located between the electromagnetic brake and the outside friction disk, and comprises a permanent magnet and a generator stator; the generator stator is connected with the electromagnetic brake stator by use of a bolt. The electromagnetic and friction integrated brake system has the advantages that the frequency of use of the friction brake is reduced, the heat of the brake system is scattered, the stability of the braking efficiency of the vehicle is improved, partial braking energy is recovered, and the braking noise is reduced and the consumption of energy of the whole vehicle during running is also reduced.

The invention discloses a test jack horse and a test method of electric vehicle electromagnetic and frictional brake integrated system; a vehicle type brake disc to be tested and an electromagnetic brake iron core wound with electromagnetic brake coil are arranged in the middle part of a test tire transmission shaft; a brake pincher is installed close to the brake disc, and is connected with a hydraulic oil path device; one end of a load wheel transmission shaft is tightly connected with a load tire and the other end thereof is connected with a rotary flywheel; the test tire is installed on the test tire transmission shaft and is contacted with the load tire; a driving motor is started to drive the test tire to rotate; the hydraulic oil path device is connected to exert a frictional brake force to the brake disc; and an oil pressure sensor transmits the detected oil pressure and the tire rotating speed signal detected by a wheel speed sensor to a control unit or a PC computer so as to control the electrification current of the electromagnetic brake coil. The invention can research the distribution relation of the brake moments of the electromagnetic brake and the frictional brake and the influence factor of the brake moment of the electromagnetic brake, and obtains the optimal structural parameters of electromagnetic brakes in different vehicle types.

A support member which is securely fixed to a truck frame is constituted by a tubular body portion and a lid portion. A couple of dry electromagnetic brakes are located in a brake accommodation room within the tubular body portion. The support member is assembled with an electric motor. A drum member which accommodates a planetary reduction gear mechanism is rotatably mounted on the outer periphery of the support member through bearings. A floating seal is provided between the support member and the drum member, and a seal ring (45) is provided between an axial bore in the support member and a coupling shaft. Thus, the two dry electromagnetic brakes are accommodated in the support member, safely shielded from lubricant oil.

The invention is suitable for the technical field of transmissions, and discloses a gearbox for an electric vehicle. The gearbox comprises a motor, a transmission and a differential mechanism. The motor comprises a stator, a rotor and a motor shell. The transmission comprises a planet gear transmission device, a transmission gear set, an electromagnetic brake and a transmission shell. The differential mechanism comprises an output shaft and a differential mechanism shell. The motor is further provided with a motor output shaft. The planet gear transmission device comprises a planet carrier, a sun gear, a planet gear and an inner gear ring. The transmission gear set comprises a first-gear driving gear, a first-gear driven gear, a second-gear driving gear and a second-gear driven gear. The electromagnetic brake comprises a magnet yoke and an electric driving board. According to the gearbox for the electric vehicle, the area and the complex degree of a gearbox outer shell are effectively reduced, the size is small and exquisite, and the manufacturing cost is low; the technical problems of a large current and power consumption during starting, climbing and overloading of an existing electric vehicle are effectively solved, and therefore the overall performance and the market competitiveness of the electric vehicle are easily improved.

The invention relates to a mechanically-coupled mini-type hybrid wind power generating system capable of storing energy in form of compressed air. The mechanically-coupled mini-type hybrid wind power generating system capable of storing energy in the form of compressed air comprises a wind turbine, the wind turbine is in shaft connection with a planetary framework of a planetary gear through an electromagnetic brake I; a solar wheel shaft of the planetary gear is connected with a swirling compounding machine through a transmission mechanism; an electromagnetic brake II or a speed reducing motor are arranged on the solar wheel shaft; the swirling compounding machine is connected with an air storing device through an air passage; a flow control valve and a check valve are arranged on the air passage; the gear ring of the planetary gear is connected with a wind power generator through a synchronous transmission belt; and the wind power generator is connected with a current transformer. The mechanically-coupled mini-type hybrid wind power generating system capable of storing energy in the form of compressed air can regulate the rotation speed of the swirling compounding machine by a pneumatic control technology and change the rotation speed of the wind turbine, so that a maximum wind energy tracking function is realized; and the swirling compounding machine is used as an energy transforming device to store surplus energy which is not used for the moment in the form of compressed air, so that a storage battery is replaced and environment pollution is greatly reduced.

The invention discloses a friction and electromagnetism integrated brake witha double disk structure for carrying out brake and deceleration on car. The brake comprises a first brake disk and a second brake disk. A brake clip is arranged on the first brake disk, and an electromagnetism brake device is arranged on the second brake disk. The electromagnetism brake device comprises several sets of excitation coils. Each set of the excitation coils comprises two coil windings and two iron cores. The coil winding is wound on the iron core. The two coil windings and the two iron cores are symmetrically distributed on both sides of the second brake disk. An aluminum support is arranged in the middle of the two coil windings. The friction and electromagnetism integrated brake with the double disks distributes brake torque of an electromagnetism brake anda friction brake through precise control, realizes brake heat shunt, avoids brake heat failure, and improves safety performance of vehicle brake.

The invention discloses a gate device of an automatic ticket checker and a control method of the gate device. The control method comprises (A) when a controller receives an instruction of opening door leaves, opening the door leaves and keeping in the opening state for first preset time, then closing the door leaves and powering on an electromagnetic brake for second preset time to lock the door leaves; and (B) when the controller does not receive the instruction of opening the door leaves, judging whether the door leaves are freely turned or forced to be turned according to the relationship between the detected door leaf position and the closed door leaf position, and if the door leaves are judged to be freely turned, powering on the electromagnetic brake to lock the door leaves for the second preset time, otherwise, sending warning information indicative of passing of a ticket check passage without permission if the door leaves are passed without permission.According to the invention, a driving mechanism and the electromagnetic brake are powered on only within a few seconds when the door leaves are opened / closed and locked, and are powered off in other time, to therefore reduce the energy consumption of the gate device.

A drive rotation member is rotated about a given axis by a crankshaft of the engine, and a driven rotation member is rotated about the given axis together with a camshaft of the engine. A relative rotation angle control mechanism is arranged through which the drive and driven rotation members are coaxially connected. The relative rotation angle control mechanism has a movable control member which, when applied with an operation force from an actuation device, varies a relative rotation angle between the drive and driven rotation members. The actuation device comprises a first electromagnetic brake which applies an operation force to the movable control member to cause a rotation of the driven rotation member to be shifted in one of advancing and retarding directions with respect to a rotation of the drive rotation member, and a second electromagnetic brake which applies an operation force to the movable control member to cause the rotation of the driven rotation member to be shifted in the other of the advancing and retarding directions with respect to the rotation of the drive rotation member.

A sphygmomanometer separately includes a cuff accommodating an air bladder and a main body provided with an expanding / contracting mechanism arranged to expand and contract the air bladder, and the cuff includes a tubular cuff main body portion into which an upper arm is insertable and a gripping portion provided on an outer peripheral surface of the cuff main body portion. The cuff main body portion has a tightening belt wrapped around the outer side of the air bladder and a tightening length adjustment mechanism arranged to variably adjust a tightening length of the tightening belt over the upper arm. The tightening length adjustment mechanism includes a winding roller arranged to wind and feed the tightening belt, a geared motor arranged to drive and rotate the winding roller, and an electromagnetic brake arranged to apply a braking force to the winding roller. With such a configuration, in the sphygmomanometer in which the cuff and the main body are separated from each other, the cuff can be easily attached to a measurement site, and reliable winding of the cuff around the measurement site can be repeated in every measurement.

The invention discloses a four-gear mechanical automatic transmission power assembly system based on planetary gear mechanisms. The four-gear mechanical automatic transmission power assembly system comprises an engine, a main clutch, a motor, a first planet row, a second planet row, two engagement devices, three auxiliary clutches, an electromagnetic brake, two brakes, a gear ring, and a transmission input shaft as well as a transmission output shaft; the first planet row, the second planet row and a splined hub are orderly arranged on the transmission input shaft; the splined hub is engaged with an engagement sleeve; and switching of four forward gears, a neutral gear and a reverse gear is realized by means of mutual cooperation of the engagement sleeve, the electromagnetic brake and the clutches. Compared with a traditional mechanical transmission, the four-gear mechanical automatic transmission power assembly system based on the planetary gear mechanisms is provided with no synchronizer, and instead, the motor is adopted for accurate speed regulation to realize smooth gear shifting, and two planetary gear mechanisms are used to take the place of traditional a plurality of pairs of gear mechanism; as a result, the overall mechanism is simple, small in volume, low in cost and easy to manufacture.

A motor with an electromagnetic brake is provided that is capable of sufficiently reducing influence of leakage magnetic flux on a magnetic sensor. A second ball bearing that rotatably supports a shaft at a position in the vicinity of a non-load-side end portion is configured to be ferromagnetic. An inner circumferential surface of a bearing stopper member that faces an outer circumferential surface of the shaft is disposed in proximity to the outer circumferential surface of the shaft. The bearing stopper member, which is ferromagnetic, is fixed to the second bearing holder in order to prevent the second ball bearing from getting out of a bearing fitting portion. A magnetic shield member is fixed to a portion of the shaft between the bearing stopper member and a magnetic sensor. The magnetic shield member guides leakage magnetic flux, which has been generated by an electromagnetic coil and leaked through the shaft, from the shaft to the bearing stopper member, thereby reducing influence of the leakage magnetic flux on the magnetic sensor.

The invention relates to a portable powered rope climbing device, which can carry persons and objects to ascend or descend along a climbing rope, and ensure controllable speed. The invention comprises a battery pack, an electromagnetic brake direct current motor, an output shaft of the said motor is connected with an input shaft of a reducer. An output shaft of the reducer and the input shaft of the reducer are arranged in a 90-degree manner. A driving rope pulley is fixed to the output shaft of the reducer. A climbing rope is wound inside the driving rope pulley. A warping brake rope-pressing pulley block and rope-pressing pulleys tightly press the climbing rope. The climbing rope is wound between the driving rope pulley and a reversing rope pulley and is led out of the driving rope pulley. A speed control module is connected with the said motor.

An electrically operated parking brake apparatus that includes an electric motor and a screw mechanism The screw mechanism includes a screw-threaded shaft adapted to be rotationally driven by the electric motor, and a nut member meshing with the screw-threaded shaft, the nut member being movable along the screw-threaded shaft by the rotation of the screw-threaded shaft. The parking brake apparatus also includes a transmission member connected to the nut member for transmitting a brake operating force to a wheel brake, and a rotation preventing unit for preventing the rotation of the screw-threaded shaft so as to hold the brake operating force by fixing the position of the nut member relative to the screw-threaded shaft. The rotation preventing unit in one embodiment is an electromagnetic brake for confining the screw-threaded shaft to a stationary portion of a vehicle body.