An electromagnetic clutch (1) of an air conditioning compressor (2), in particular for a motor vehicle (11), transmits a torque to a drive shaft (3) of the compressor (2) depending on an electric current (I) being fed to clutch coils (4) of the electromagnetic clutch (1) to generate an electromagnetic clutch force. According to a control method (10), a slippage of the electromagnetic clutch (1) is determined by a difference between the rpms of the electromagnetic clutch (1) and of the drive shaft (3), and is monitored by a slippage sensor (5). The electric current (I) and the resulting clutch force are adjusted dependent on slippage by a pulse width modulation controller (6) of the compressor (2). The pulse width modulation controller (6) is electrically connected to the clutch coils (4) and modulates a pulse width of the electric current (I) fed to the clutch coils (4).

An electromagnetic brake assembly includes a solenoid coil; a fixed ferrous brake stator; a ferrous armature having a braking face, wherein the armature is moveable in a translation direction relative to the brake stator between a disengaged position and an engaged position; and a rotating member including a mating surface and that rotates relative to the armature when the armature is in the disengaged position. When the solenoid coil is energized, the armature translationally moves from the disengaged position to the engaged position, and in the engaged position the braking face of the armature interacts with the mating surface of the rotating member to apply a braking force to the rotating member. The braking face and the mating surface may form a conical interface, and the conical interface further may include a friction O-ring positioned within a slot that permits the O-ring to roll along the braking interface when the armature moves between the disengaged position and the engaged position.

A braking assembly for inhibiting rotation of a wheel around a rotation axis is provided. The braking assembly includes a drive gear, an actuator, an electric braking assembly, a mechanical braking assembly including a brake pad, and a brake rotor fixedly coupled to the wheel. The drive gear rotates with the wheel and includes a pinion. The electric braking assembly includes a coil surrounding the rotation axis, and a magnetic disc assembly concentric with the coil and configured to rotate relative to the coil. The magnetic disc assembly includes a plurality of magnets at a perimeter of the disc. The actuator engages the pinion to inhibit rotation of the magnets and generate an electro motive force to inhibit rotation of the wheel. The actuator engages the brake pad to contact the rotor and inhibit rotation between the wheel and the brake pad.

A power take-off includes bell housing disposed about an axis and configured for coupling to a housing of an engine or other driving device at a first axial end and to a housing of a driven device at a second axial end. The bell housing defines an air inlet port and an air outlet port between the first and second axial ends. A clutch is disposed within the bell housing and configured to transfer torque from an input member coupled to the engine to an output member coupled to the driven device. A fan is configured for rotation with the input member to draw air into the bell housing through the air inlet port, move air through the bell housing from the air inlet port to the air outlet port in a substantially radial direction across the clutch and exhaust air from the bell housing through the air outlet port.

This disclosure relates to a magnetorheological (MR) brake. The MR brake includes a rotor constructed at least partially of a ferromagnetic material, and a housing that supports the rotor such that the rotor and the housing are rotatable relative to each other about an axis, wherein the housing and rotor are configured such that a fluid gap is defined between the housing and the rotor, and wherein portions of the housing adjacent the rotor are constructed at least partially of a ferromagnetic material. An MR fluid is disposed in the fluid gap. A current-carrying coil is excitable to generate a magnetic field within ferromagnetic portions of the rotor and the housing and acts on the MR fluid. At least one element constructed of a material having low magnetic permeability is configured route the lines of magnetic flux through surrounding higher permeability material on opposite sides of the fluid gap.

A brake and method of assembly are provided. The brake includes a friction plate configured for coupling to a rotatable body for rotation with the rotatable body about an axis of rotation, a pressure plate disposed about the axis on a first side of the friction plate and fixed against rotation, and an armature plate disposed about the axis on a second side of the friction plate. An electromagnet is disposed about the axis on an opposite side of the armature plate relative to the friction plate. A spring biases the armature plate in a first axial direction towards the friction plate and away from the electromagnet to engage the brake. A fastener couples the pressure plate to the electromagnet. The fastener conforms to a space between opposed surfaces of the pressure plate and the electromagnet and, upon hardening, bonds the pressure plate to the electromagnet.

An electromagnetic rail brake device of a rail vehicle having at least one brake magnet which has a magnet coil body and at least one magnetic core, and wherein the magnet coil body carries at least one magnet coil winding, and having an electric connector device, by way of which the at least one magnet coil winding is supplied with current, wherein the electric connector device has at least one pin-shaped electric connector body which is connected via a releasable electric connection to at least one current-conducting electric cable which is guided from the outside to the at least one pin-shaped connector body in relation to the brake magnet. The at least one pin-shaped electric connector body may be arranged on a free and outer surface of the magnet coil body or an element which is connected to the magnet coil body.

Provided is a braking device for a driving shaft, and the braking device includes: a brake ring coupled to the driving shaft in such a manner as to rotate according to rotation of the driving shaft and having one or more locking pieces with cross-shaped ends; a support frame fixed to an interior of a robot articulation; brake wings rotatable around brake shafts formed on the support frame and having locking protrusions adapted to stop the rotation of the driving shaft through physical interference with the cross-shaped ends of the locking pieces of the brake ring; position regulators adapted to rotate the brake wings to allow positions of the locking protrusions to be moved; and elastic members adapted to apply elastic forces to the brake wings rotating.

An electromagnetic braking device for braking a rotary shaft includes a friction disk mounted to the shaft and movable in translation and rotation, an outer part, and an intermediate part movable in translation between the friction disk and the outer part. At least one of the outer and intermediate parts is magnetic. At least one electromagnetic actuating member and at least one mechanical actuating member are housed in the other of the outer and intermediate parts. The intermediate part moves in a first direction toward the friction disk under the action of the mechanical actuating member and in a second direction toward the outer part under the action of the electromagnetic actuating member. A plurality of independent magnetic sheets move in translation between the intermediate and outer parts under the action of the mechanical actuating member and/or electromagnetic actuating member.

A brake assembly is suitable for use in conjunction with a wheel having a rim rotatably mounted to an axle. The brake assembly includes a rotor configured to rotate about the axis with the rim. The rotor has a first frustoconical rotor surface and either a conductive element or a magnet. The brake assembly further includes a stator fixed in rotation about the axis and configured for selective translation parallel to the axis. The stator has a first frustoconical stator surface proximate to the first frustoconical rotor surface and a conductive element, when the stator has a magnet, or a magnet, when the stator has a conductive element.