An electromechanical actuator (1) includes a motor (3) driving a shaft (4), a piston (5) movable in an axial direction between a low and high positions and an upper sleeve (8) slidably mounted on the shaft (4) below the piston (5). A lower sleeve (7) is attached to the shaft (4) and radially extending arms (9) are attached to the shaft (4) between the sleeves (7, 8). Flyweights (10), elongated in the axial direction, are slidably mounted on the arms (9). Lower and upper ramps (11, 12) contact the axial ends of the flyweights (10) and start from one of the sleeves (7, 8) and extend away from the shaft (4) towards the other sleeve (7, 8) such that the flyweights (10) are interposed between the ramps (11, 12) to maintain the spacing of the sleeves (7, 8). An electromagnet (14) holds the piston (5) in the high position.

A brake device for an elevator system and a testing method thereof. The brake device includes: a fixed member; a moving member movable between a retracted position and a braking position so as to realize switching of the moving member between an attracting state and a braking state, respectively; an elastic member to provide elastic force tending to push the moving member toward the braking position; a coil configured to produce an electromagnetic force tending to drive the moving member to move toward the retracted position when energized; and a controller configured to control a change of a magnitude of the electromagnetic force produced by the coil in a process of testing the spring force of the elastic member, and to acquire corresponding information of the electrical signal for controlling the magnitude of the electromagnetic force when the moving member switches from the attracting state to the braking state.

A brake device for an elevator system and a testing method thereof. The brake device includes: a fixed member; a moving member movable between a retracted position and a braking position so as to realize switching of the moving member between an attracting state and a braking state, respectively; an elastic member to provide elastic force tending to push the moving member toward the braking position; a coil configured to produce an electromagnetic force tending to drive the moving member to move toward the retracted position when energized; and a controller configured to control a change of a magnitude of the electromagnetic force produced by the coil in a process of testing the spring force of the elastic member, and to acquire corresponding information of the electrical signal for controlling the magnitude of the electromagnetic force when the moving member switches from the attracting state to the braking state.

A multiple brake hoist system includes a hoist for lifting and lowering a load and a power supply for supplying electrical power to the hoist. The power supply is configured to retain electromagnetic and capacitive energy upon deactivation. Primary and secondary brakes engage the hoist upon deactivation from the power supply. The primary and secondary brakes are connected to the power supply in a fail-safe configuration to maintain a non-engaged state on the hoist during activation of the power supply. The primary brake establishes an engaged state on the hoist upon deactivation from the power supply. The secondary brake establishes an engaged state on the hoist after a predetermined time-delay associated with consuming the predetermined amount of electromagnetic and capacitive energy of the power supply upon deactivation. In this manner, the primary and secondary brakes prevent a differential torsional stress between the mechanical components upon deactivation of the power supply.

A multiple brake hoist system includes a hoist for lifting and lowering a load and a power supply for supplying electrical power to the hoist. The power supply is configured to retain electromagnetic and capacitive energy upon deactivation. Primary and secondary brakes engage the hoist upon deactivation from the power supply. The primary and secondary brakes are connected to the power supply in a fail-safe configuration to maintain a non-engaged state on the hoist during activation of the power supply. The primary brake establishes an engaged state on the hoist upon deactivation from the power supply. The secondary brake establishes an engaged state on the hoist after a predetermined time-delay associated with consuming the predetermined amount of electromagnetic and capacitive energy of the power supply upon deactivation. In this manner, the primary and secondary brakes prevent a differential torsional stress between the mechanical components upon deactivation of the power supply.

An electromagnetic brake with a housing body and a coil unit, wherein the coil unit has a positive connection to the housing body, wherein the coil unit is positively connected to the housing body by means of a snap-fit connection, wherein at least one snap hook of the coil unit is supported on a web of the housing body.

An electromagnetic brake with a housing body and a coil unit, wherein the coil unit has a positive connection to the housing body, wherein the coil unit is positively connected to the housing body by means of a snap-fit connection, wherein at least one snap hook of the coil unit is supported on a web of the housing body.

A drawworks brake performance assessment system comprising a drawworks comprising a rotatable spool; a braking system comprising a rotor associated with the rotatable spool and at least one hydraulic disc brake comprising a master cylinder assembly and a caliper assembly comprising a caliper and opposing brake pads, wherein the master cylinder assembly is operable with the caliper assembly to manipulate one of the opposing brake pads to apply a clamping force to the rotor; and a brake sensor system comprising a sensor and an operations module, the sensor being operable to measure a displacement distance between one of the opposing brake pads and a surface of the rotor, and to output corresponding sensor data to the operations module that is operable to receive and process the sensor data and to determine one or more performance characteristics of the braking system based on the sensor data.

A drawworks brake performance assessment system comprising a drawworks comprising a rotatable spool; a braking system comprising a rotor associated with the rotatable spool and at least one hydraulic disc brake comprising a master cylinder assembly and a caliper assembly comprising a caliper and opposing brake pads, wherein the master cylinder assembly is operable with the caliper assembly to manipulate one of the opposing brake pads to apply a clamping force to the rotor; and a brake sensor system comprising a sensor and an operations module, the sensor being operable to measure a displacement distance between one of the opposing brake pads and a surface of the rotor, and to output corresponding sensor data to the operations module that is operable to receive and process the sensor data and to determine one or more performance characteristics of the braking system based on the sensor data.