Abstract: Provided are a spool braking device and a fishing reel equipped with the spool braking device. In the spool braking device, a magnet holder with a magnet moves toward an axial direction of a spool using eddy current and thus controls a rotational speed of the spool through a varying magnetic force acting on a braking plate of the spool. The spool braking device is capable of preventing a decrease in a distance a lure travels during casting when the spool is rotated at a low speed and preventing a backlash phenomenon through a braking operation suitable for high-speed rotation of the spool.

Abstract: A controller controls switching between a braked state in which a movable meshing part 7 comes close to and meshes with a motor meshing part 6 and a brake released state in which the movable meshing part 7 is separated from the motor meshing part 6.

Abstract: The present invention is intended to provide: a cooling jacket device 1 which offers excellent cooling performance, is easy to manufacture and enables cost reduction; and a rotary electric machine including the cooling jacket device.

Abstract: Embodiments involve rotors for axial flux induction rotating electric machines that use a soft magnetic composite for the rotor core. A first embodiment is directed to a rotor for a rotating electrical machine that transmits magnetic flux parallel to a shaft of the rotor. The rotor includes a rotor winding and a plurality of cores. The rotor winding consists of a solid piece of conductive material that comprises a plurality of cavities. Each core is placed in a respective cavity and comprises a highly resistive isotropic ferromagnetic powder.

Abstract: An example system includes a disk that is rotatable and has a plurality of ferromagnetic elements disposed in a radial array on a surface of the disk; and at least one electro-permanent magnet (EPM) mounted adjacent to the disk such that a gap separates the disk from the EPM. Applying an electric pulse to the at least one EPM changes a magnetic state thereof, thereby generating an external magnetic field that traverses the gap between the disk and the EPM and interacts with a ferromagnetic element of the plurality of ferromagnetic elements, and causing a rotational speed of the disk to change as the disk rotates.

Abstract: An apparatus for cooling an electric machine includes a plurality of fluid channels disposed in a first surface that surrounds at least part of the electric machine. Each of the plurality of fluid channels defines a circumferential path in the first surface, including a first channel section extending at least substantially parallel to first and second circumferences defined by ends of the electric machine, and including a second channel section configured to direct a cooling fluid between a central region of the first surface and an end region of the first surface. The apparatus also includes an outer shell configured to surround the first surface and define a fluid tight chamber between the first surface and the outer shell, the outer shell having at least one inlet through which the cooling fluid is introduced into the chamber and at least one outlet from which the cooling fluid exits the volume.

Abstract: An engine testing system comprises a rotary absorber that provides a variable resistance to an engine under test and heats coolant from a cold reservoir. A hot reservoir coupled to rotary absorber stores the heated coolant for later (or concurrent) use. Moreover, an organic Rankine cycle turbine-generator device is coupled to the hot reservoir, which converts heat from heated coolant into electrical power. A conditioning system is coupled to the organic Rankine cycle turbine-generator device that cools the coolant for storage in the cold reservoir. The available captured waste energy may be augmented with waste energy that is also available during engine testing. The additional waste energy may be in the form of exhaust gases, thrust, heat from engine coolant systems, residual engine heat, radiant or convective waste heat, friction etc. Variations of the above system may replace the primary energy re-capture from other than a rotary absorber.

Abstract: An electromechanical strut and method of moving a closure member of a vehicle between an open position and a closed position is provided. The electromechanical strut includes a power drive unit including a motor, a leadscrew, a planetary gearset operably connecting the motor to the leadscrew, and an electromechanical brake assembly. The electromechanical strut further includes a telescoping unit including an extensible tube and a drive nut for converting rotary motion of the leadscrew into linear motion of the telescoping unit. The electromechanical brake assembly is selectively moveable between an engaged state, wherein the leadscrew is prevented from rotating to prevent relative axial movement between the power drive unit and the telescoping unit, and a disengaged state, wherein the leadscrew is permitted to rotate to allow relative axial movement between the power drive unit and the telescoping unit.

Abstract: A projectile intended for damping a spacecraft (100) comprising a main body (110) and active attitude control means (150) comprises a harpoon and is intended to equip a space delivery vehicle to be projected towards the spacecraft. It comprises a passive damper (200) mounted such that it is fixed on the harpoon and suitable for generating, in cooperation with the Earth's magnetic field, a damping torque. That passive damper (200) comprises an outer enclosure (210) and an inner body (220) configured such that: the inner body, permanently magnetized, is positioned inside the outer enclosure and is capable of moving in rotation about at least one axis of rotation, the outer enclosure and the inner body comprise respectively an inner surface and an outer surface, separated by means of a viscous fluid, the outer enclosure is fixed to the main body of the spacecraft for rotation therewith once the harpoon is secured to the main body.

Abstract: Described herein is an assembly and methods of use thereof for controlling or governing the relative speed of motion between the assembly parts via eddy current formation. The assembly and methods also may minimize the number of parts required and may minimize the number of moving parts thereby increasing the mechanical durability of the assembly compared to art designs that may have more moving parts and greater part complexity.

Abstract: An apparatus has a first portion of a magnetic braking system with a first element disposed thereon. The first portion rotates about an axis. The position of the first element is a fixed distance from the axis. A second portion of the magnetic braking system has a second element disposed thereon. A spring biases the rotatable first portion a first distance from the second portion. Upon application of a force to one of the portions, the relative position of the rotatable first portion to the second portion is reduced to a second distance less than the first distance.

Abstract: Described herein is an assembly and methods of use thereof for controlling or governing the relative speed of motion between the assembly parts via eddy current formation. The assembly and methods also may minimize the number of parts required and may minimize the number of moving parts thereby increasing the mechanical durability of the assembly compared to art designs that may have more moving parts and greater part complexity.

Abstract: A cutting tool includes a cutting insert mounted to a head attached to a collar at a first end of the cutting tool. A shank is located at a second, opposite end of the cutting tool. A central cavity extends inwardly from the first end toward the shank. An eddy current vibration absorber assembly is disposed within the central cavity. The eddy current vibration absorber assembly includes an absorber mass made of an electrically conductive material, a magnetic material proximate the absorber mass, and a support member for supporting the absorber mass within the central cavity. The eddy current vibration absorber assembly is tuned by selectively adjusting a distance between the absorber mass and the magnetic material.

Abstract: The invention relates to a chassis dynamometer and to a method for simulating the behavior of the vehicle in a chassis dynamometer, comprising an actuator for transferring a longitudinal force to the vehicle, a rotational movement carried out by a wheel or a drive train of the vehicle being measured, a corresponding longitudinal acceleration being determined from the measured rotational movement and the actuator being controlled in accordance with the determined longitudinal acceleration based on the measurement.

Abstract: A shifter assembly for changing gears in a vehicle transmission, including a housing and a shift rod rotatably supported in the housing. The shift rod is selectively movable between a plurality of radial positions. A disc is in rotational communication with the shift rod for concurrent movement between the radial positions. The disc defines a plurality of gates each having respective first and second ends. A plurality of solenoids are disposed in the housing adjacent the disc. Each of the solenoids has a plunger selectively movable between a first position spaced from the disc and a second position disposed within one of the gates. The gates are spaced equally from each other and are radially aligned about a common reference circle. Rotation of the shift rod is selectively limited by at least one of the plungers in the second position engaging at least one of the ends of the gates.

Abstract: A method of controlling an electrical machine. The electrical machine includes a stator having a core and a plurality of windings, and a rotor disposed adjacent to the stator to interact with the stator. The method includes configuring an amplitude value and frequency values of a three-phase alternating current (AC) voltage startup signal having an amplitude and a frequency, providing the three-phase alternating current (AC) voltage startup signal to the plurality of windings, and altering the frequency of the three-phase AC voltage startup signal according to a preprogrammed frequency ramp function defined by the frequency values. The method further includes discontinuing the three-phase AC voltage startup signal after the frequency ramp function has completed, and switching to a back electromotive force (BEMF) control mode after discontinuing the three-phase AC voltage startup signal.

Abstract: A rotary damper for a motor vehicle includes at least one damper element for damping the relative movement of a first mass located on the wheel-suspension side and of a second mass located on the vehicle-body side, with at least one vibration absorber (8) being arranged on the rotary damper (1).

Abstract: An explosion-proof braking device is described, which is configured to be connected to the front flange of an explosion-proof electric motor, the braking device comprising: a shaft (6) connected to the shaft of the motor from the outside, and provided with bearings (7, 8) internal to the device, an electromagnetic brake (11, 12, 13, 14) acting upon said shaft (6), comprising at least one excitation coil (11) and one air gap (10). The shaft (6) is made of a non-magnetic metal alloy, the bearings (7, 8) are so positioned as to lie outside the main flux lines of the magnetic field produced between the coil and the air gap, and the braking device is provided with flame-proof lamination joints of the through or closed type.

Abstract: A magnetic spring arrangement for a resonant motor, comprising: a housing (12), magnets (14, 16) fixed in position at opposing ends (13, 15) of the housing, a magnet (18) positioned within the housing for movement toward and away from the fixed magnets in a reciprocal oscillating motion with a driving action produced by a stator coil (24) and an AC drive signal (26), wherein an applicator member (32) is attachable to the moving magnet for corresponding movement of a workpiece portion (34) of the applicator member.

Abstract: The rotary/push operating device (10) for a human-machine interface, in particular for a vehicle component, such as an air conditioning system, is provided with a rotary/push operating element (12) that can be rotated about a guide shaft (14) in a rotary movement and moved axially along the guide shaft (14). Furthermore, the rotary/push operating device (10) has a rolling bearing unit (30) having an outer bearing ring (32), an inner bearing ring (34) and rolling elements (36,38) arranged therebetween, wherein one of the bearing rings (32, 34) is connected with the rotary/push operating element (12) in a rotationally fixed manner and can be rotated therewith.

Abstract: Provided is a rotary electric machine capable of improving cooling performance for a stator coil and a stator core. In the rotary electric machine, an outer-side outer diameter portion (26) of an exhaust hole (24) is formed on an inner diameter side of a position which is opposed to an axial-direction side end surface (30) of a fan blade (27) of a centrifugal fan (13) in an axial direction. Therefore, the axial-direction side end surface (30) of the fan blade (27) and the exhaust hole (24) have a positional relationship so as not to overlap each other in the axial direction. In this manner, cooling air exhausted through the exhaust hole (24) is unlikely to be forced to return to the exhaust hole (24). Therefore, exhaust efficiency is improved to efficiently cool a stator coil (22) and a stator core (21).

Abstract: An energy regeneration device of a suspension system for a vehicle is provided and includes a suspension link connecting a wheel carrier to a vehicle body and a bush unit disposed between a vehicle body connection portion of the suspension link and the vehicle body, outputs hinge motion of the suspension link via an output gear. A rotation fixing mechanism rotates the output gear by connecting the output gear to a side of the suspension link. A one-way power transmission mechanism connected with the output gear receives the hinge motion via an input gear and outputs one-way rotational power. A generator generates electricity while being rotated by the transmitted one-way rotational power. A speed-up mechanism disposed between the generator and the one-way power transmission mechanism transmits the one-way rotational power to the generator. A rectifier electrically connected with the generator, rectifies the electricity generated by the generator.

Abstract: A machine (1) having a rotor (11) including permanent magnets (PM) and field coils (EC). The magnets are housed in first axial recesses (E1) distributed within a circumferential portion of the magnetic body, thus defining circumferential polar sections. The coils are housed in second axial recesses (E2) distributed within an intermediate portion of the magnetic body and defining pole teeth (RT). The ratio of a width of a pole tooth to a height of a permanent magnet is around 0.65 to around 1.

Abstract: A stator (1?) for electromagnetic retarders intended for vehicle gearbox and axle installations, includes at least one electromagnetic coils (2) assembly, two identical annular radial flanges (5?, 5?), and an asymmetrical pole shoe (6) on each radial transverse face of the two ends of each of the electromagnetic coils, and attached by a central axial screw (7), perforated attachment studs that are symmetrical relative to a median plane (M) between and parallel to the transverse faces, attached to the electromagnetic coil (2) support (5?, 5?) in order to attach the stator (1?) beside one or the other of the transverse faces to a stator support of the vehicle, using fasteners.

Abstract: A rotary electric machine according to an aspect of an embodiment includes a detector and a brake. The detector is provided at the counter-load side of a shaft for rotating along with a rotor to drive a predetermined load and detects the rotation position of the shaft. The brake is exchangeably provided at the outer circumferential side of the detector to control the rotation of the shaft.

Abstract: The electric motor consists of a rotor fitted with permanent magnets and comprises a stator the armature of which is made up of two parts: a stack of laminations forming round teeth and a solid tube-shaped field frame made of a material of the stainless steel kind enveloping the said stack of laminations. This armature constitutes a non-disengageable braking system that produces a damping effect in the face of possible movements of its rotor which are brought about and/or imposed by the members with which it collaborates. This motor can be used for driving a roto-linear actuator device with satellite rollers which is used as an actuator for maneuvering the control surfaces of an aircraft, for example an aileron.

Abstract: An electromagnetic braking system includes an electrically conductive disc coupled to a rotatable shaft of a power generation system. The rotatable shaft is operatively coupled to a prime mover and a generator. The electromagnetic braking system further includes an inducting unit for applying an electromagnetic braking torque on the electrically conductive disc when commanded by a control signal and a controller for receiving an activation signal from an activating unit, receiving a rotational signal from a rotational sensor coupled to the rotatable shaft or the generator, determining a control signal when the rotational signal is outside of a threshold, and, when the activation signal is active and the rotational signal is outside of the threshold, sending the control signal to the inducting unit to regulate a rotational dynamic of the rotatable shaft.

Abstract: A flywheel magnetic controller for mating with an existing flywheel has a magnetic wheel, an external driving module, an elongated pulling element and a rotary engaged adjustment unit. The cable assembly adjustment structure of the flywheel magnetic controller is simplified structurally, thus greatly reducing the fabrication and assembly cost, and facilitating flexible and universal assembly with better applicability.

Abstract: An electromagnetic braking system includes an electrically conductive disc coupled to a rotatable shaft of a power generation system for operating in an island mode. The rotatable shaft is operatively coupled between a prime mover and a generator for supplying power to an island grid. The electromagnetic braking system further includes a controller for receiving at least one status or synchronization signal and for generating a control signal based on the at least one signal and an inducting unit for applying an electromagnetic braking force on the electrically conductive disc when commanded by the control signal to regulate a rotational speed of the rotatable shaft.

Abstract: An eddy-current braking mechanism including a rotor, rotatable about a rotor axis; at least one electrically conductive member coupled to the rotor for rotation therewith; at least one magnet configured to apply a magnetic field extending at least partially orthogonal to the plane of rotation of the conductive member, and characterised in that upon rotation of the rotor, the conductive member is configured to move at least partially radially from the rotor axis into the applied magnetic field.

Abstract: A bowling machine motor/gearbox conversion and adaptor kit may allow people to reuse their current gearboxes by adapting the components to utilize a new motor that would make the gearbox universal instead of having different motor/gearbox combinations. The adaptor kit may adapt the gearbox portion of the motor/gearbox assembly to allow the gearbox to accept a current, new motor. A person may use the adaptor kit to repair and replace components of a bowling machine's motor and gearbox assembly.

Abstract: A system for blocking an output shaft of the engine of an automobile, of a type that includes a toothed wheel coaxially mounted on the shaft, and a first finger mobile between a shaft releasing position and a shaft blocking position in which the first finger is engaged in a gap formed between two teeth of the wheel. The system includes an alignment mechanism capable of aligning a gap between two teeth of the wheel and the first mobile finger, and the first mobile finger is configured to be inserted into the gap without any substantial circumferential clearance.

Abstract: An electromagnetic braking system of a power generation system includes an electrically conductive disc coupled to a rotatable shaft operatively coupled between a prime mover and a generator; a controller for receiving a status signal from the power generation system and for generating a control signal based on the status signal; and an inducting unit for applying an electromagnetic braking force on the electrically conductive disc when commanded by the control signal to regulate a rotational speed of the rotatable shaft.

Abstract: An electric motor is disclosed and which includes a braking element which is biasingly urged into a braking relationship relative to the electric motor, when the electric motor is deenergized, but which is further moved out of braking engagement when the electric motor is energized. The invention finds particular usefulness when used on hand tools, such as angle grinders.

Abstract: A magnetic-controlled actuator (100) with an auto-locking function for joints of a manipulation arm mainly includes an inner-layer stator (10), an inner-layer mover (20), an outer-layer mover (30), an outer-layer stator (40), and a fixing shaft (50). The inner-layer mover (20), the outer-layer mover (30), and the outer-layer stator (40) have a plurality of permanent magnets, respectively. The fixed shaft (50) simultaneously penetrates through the inner-layer stator (10), the inner-layer mover (20), the outer-layer mover (30), and the outer-layer stator (40) forming a coaxial arrangement. The inner-layer mover (20) rotates relatively to the inner-layer stator (10) to output power from the actuator (100). Therefore, a cogging effect, which is produced due to interaction of the permanent magnets between the outer-layer mover (30) and the outer-layer stator (40), is automatically produces a high cogging torque for the actuator (100).

Abstract: A stator (1?) for electromagnetic retarders intended for vehicle gearbox and axle installations, includes at least one electromagnetic coils (2) assembly, two identical annular radial flanges (5?, 5?), and an asymmetrical pole shoe (6) on each radial transverse face of the two ends of each of the electromagnetic coils, and attached by a central axial screw (7), perforated attachment studs that are symmetrical relative to a median plane (M) between and parallel to the transverse faces, attached to the electromagnetic coil (2) support (5?, 5?) in order to attach the stator (1?) beside one or the other of the transverse faces to a stator support of the vehicle, using fasteners.

Abstract: A magnetic brake system includes a magnetic induction unit, which is fixedly mounted at the chassis of a vehicle and comprising a stack of silicon steel sheets and a coil wound round the stack of silicon steel sheets and electrically connected to a switch at a brake pedal of the vehicle, and a magnetic attraction unit, which is arranged corresponding to the magnetic induction unit for causing a magnetic attractive or repulsive force between the magnetic induction unit and the magnetic attraction unit when the brake pedal is pressed to switch on the switch.

Abstract: A rotating electrical machine apparatus comprising a motor generator 10 having a stator (11) to which a plurality of coil groups are provided and a rotor (12), and a control apparatus (30) which controls a current supplied to the coil groups of the stator (11), wherein the stator (11) is provided with a stator friction portion (21) and the rotor (12) is provided with a rotor friction part (19), and the rotor (12) is movable between a connection position, in which the stator friction portion (21) and the rotor friction portion (19) are in contact with each other and the rotor (12) and the stator (11) are connected with each other, and a separation position, in which the stator friction portion (21) and the rotor friction portion (19) are separated from each other, and is constituted to move to the connection position when at least two coil groups among the plurality of coil groups are simultaneously excited, and the control apparatus (30) controls a current supplied to the coil groups so that at least two coil

Abstract: A damper actuator motor device includes a fan brake device which is secured to a motor rotor shaft and is configured to reduce motor rotation speed in a preferential direction. Preferably, the fan brake device has an asymmetric configuration, and is adapted to gather air radially in an enclosed cavity and discharge it axially in one direction. The fan device preferably is adapted to project a size that takes up more than half of the space of the cavity. When the motor is back driven, the fan brake device causes differentially pressure and air resistance in a confined area, producing a drag and braking force that increases with motor speed. The invention can be applied to motor actuators used to control air dampers and other valves in gas or fluid delivery systems. The invention can also be used to reduce water hammer in water delivery systems.

Abstract: A stepper actuator including a brake drum and a central gear mechanically connected thereto. The brake drum and the central gear are selectively rotatable in opposing first and second rotational directions. First and second actuation members are moveable through first and second actuation cycles to incrementally rotate the central gear. The actuation members engage and subsequently disengage the central gear as they move through their actuation cycles. The actuation members are configured to rotate the central gear during engagement therewith. A braking assembly is operatively connected to the first and second actuation members and is frictionally engaged to the brake drum to prevent rotation of the brake drum when the first and second actuation members are each in a retracted position as occurs when neither is moving through a corresponding actuation cycle.

Abstract: In a disk brake for a vehicle, an electric motor is attached to a caliper body so as to exhibit a power for urging a friction pad toward a disk rotor. The electric motor includes a brush holder for holding brushes which contact a commutator at positions at even distances in a circumferential direction of an armature. Internal feed terminals are disposed in the brush holder so as to provide connection between the brushes and feed wires respectively leading to the brushes. A rotational angle detecting sensor is disposed in the brush holder so as to detect a rotational angle of the electric motor. The rotational angle detecting sensor is disposed in the brush holder on a side opposite from the internal feed terminals with respect to the armature. Thus, it is possible to improve assemblability of the rotational angle detecting sensor to the brush holder, and facilitate operation of connecting the feed wires to the brush holder.

Abstract: An eddy-current braking mechanism including a rotor, rotatable about a rotor axis; at least one electrically conductive member coupled to the rotor for rotation therewith; at least one magnet configured to apply a magnetic field extending at least partially orthogonal to the plane of rotation of the conductive member, and characterised in that upon rotation of the rotor, the conductive member is configured to move at least partially radially from the rotor axis into the applied magnetic field.

Abstract: A magnetic electron exciter includes a rotor adapted to be rotated within a selected range of rotational speeds, and having a plurality of magnets mounted therein selected distances from the rotational axis of the rotor. A plurality of coils are positioned adjacent to the rotor, whereby rotation of the rotor creates an electrical current in the coils. First and second electrodes are spaced apart a determined distance, and are electrically connected with the coils to create an arc between the electrodes when the rotor is rotated relative to the coils. The magnetic electron exciter can be used as a non-contact brake for machines, such as motor vehicles, wind turbines and the like.

Abstract: An electromagnetic non-contact brake may include an annular stator assembly including a predetermined number of poles formed about the stator assembly. A rotor assembly is disposed within the stator assembly and may include a selected number of poles formed about the rotor assembly. A shaft may extend through a center portion of the rotor assembly and be fixedly attached to the rotor assembly. An electrical connection is adapted to controllably apply electrical power to at least one of the stator assembly and the rotor assembly. The electrical power causes a plurality of magnetic fields to be simultaneously generated around at least one of the stator assembly and the rotor assembly by the poles. Each of the plurality of magnetic fields causes the poles of the stator assembly and the poles of the rotor assembly to be magnetically attracted to one another to substantially prevent the rotor assembly and the shaft from rotating.

Abstract: An electric motor (102) with passive integral brake (104) includes a stator (204) with one or more magnetic field controllable coils (206) and a rotor (208) with a rotor shaft (210) positioned within an inner diameter (212) of the stator (204). The rotor (208) is operable to rotate about a longitudinal axis (214) of the rotor shaft (210). The electric motor (102) with passive integral brake (104) also includes a brake shoe (302) positioned within the inner diameter (212) of the stator (204) along the longitudinal axis (214) of the rotor shaft (210). The brake shoe (302) is operable to apply a braking force to the rotor shaft (210) and remove the braking force from the rotor shaft (210) responsive to a magnetic field strength produced by the one or more magnetic field controllable coils (206). One or more springs (220) passively apply the braking force.

Abstract: Residual magnetic locks, brakes, rotation inhibitors, clutches, actuators, and latches. The residual magnetic devices can include a core housing and an armature. The residual magnetic devices can include a coil that receives a magnetization current to create an irreversible residual magnetic force between the core housing and the armature.

Abstract: A power transmission apparatus includes a drive roller and a driven roller made of magnetic material, which are rotatable about different axes, and which are provided with a gap therebetween, a case enclosing the rollers, an input shaft and an output shaft connected coaxially with the rollers through the case, respectively, and a magnetic fluid housed in the case to fill the gap. The apparatus includes an electromagnetic coil for generating magnetism, and a magnetic path of the magnetism generated by the electromagnetic coil is formed so that a magnetic field is generated from the drive roller or the driven roller toward the driven roller or the drive roller via the gap.

Abstract: The invention relates to a mounting of one or more electromagnetically bleeding spring-loaded brakes (a, b) on a machine wall or the like. The invention is characterized in that the brakes are, while distributed over the periphery on the face, act upon an axially moving brake rotor (5) with continuous friction linings (6) on both sides (i.e. left and right), whereby braking (left) surface of the friction lining (6) and on the opposite side with the armature discs of the brakes on the second (right) friction lining (6).

Abstract: An electrical machine includes a stator having circumferentially arranged winding heads, with a winding head space being defined radially beneath the winding heads. Interacting with the stator is a rotor which has a rotatable laminated core. A magnetic brake is received in the winding head space and includes a magnet module having at least one permanent magnet which is axially resiliently fixed and constraint against rotation and which is magnetized in an axial direction, and an electromagnet which is arranged axially adjacent to the permanent magnet and securely fixed thereto. The electromagnet produces a magnetic field with a main direction oriented in an axial direction. Interacting with the at least one permanent magnet and the electromagnet is a ring-shaped armature which is secured directly and rigidly to the rotor so as to establish a fixed rotative engagement between the armature and the rotor.

Abstract: A brake structure for a main shaft of a direct drive torque motor comprises a body, a direct drive torque motor, a main shaft and a brake assembly. The main shaft is provided for fixing the torque motor and the body, and the brake assembly is mounted between the body and the main shaft. An annular brake oil room of the brake assembly is positioned against the main shaft, and the brake seat subassembly has a thinner brake deformation wall formed between the annular brake oil room and the main shaft. The annular brake oil room utilizes its high pressure caused deformation to the brake deformation wall, thus achieving a braking effect by pressing the main shaft. Thereby, the present invention is easy to assemble, and not only can stop the main shaft quickly, but also has a greater locking force.