A method and a safety brake for a lifting device, wherein a solenoid or another electromechanical actuator is used to actuate a pawl, where the position of the pawl is monitored via at least two switches or sensors, where the lowering motion of the load or the lifting device is monitored and the safety brake is triggered in the event of a fault via a safety-oriented controller and at least one sensor, where the solenoid or the pawl is arranged such that, via spring force and/or gravity, the pawl is brought into engagement when the actuator, for example, the solenoid, is deenergized such that it is possible to exactly define and monitor the limit speed and, by using the two sensors, it is also possible to monitor the function and the motion of the pawl and to detect undesired operating states.

A method and a safety brake for a lifting device, wherein a solenoid or another electromechanical actuator is used to actuate a pawl, where the position of the pawl is monitored via at least two switches or sensors, where the lowering motion of the load or the lifting device is monitored and the safety brake is triggered in the event of a fault via a safety-oriented controller and at least one sensor, where the solenoid or the pawl is arranged such that, via spring force and/or gravity, the pawl is brought into engagement when the actuator, for example, the solenoid, is deenergized such that it is possible to exactly define and monitor the limit speed and, by using the two sensors, it is also possible to monitor the function and the motion of the pawl and to detect undesired operating states.

An electromagnetic device for an elevator brake, an elevator brake and an elevator system. The electromagnetic device is configured to be provided in the number of at least two in the elevator brake, and each of the electromagnetic devices includes: a fixed member, which is fixed relative to an elevator power device and provided with at least one electromagnetic member for providing an electromagnetic force after being energized; a movable member, which is arranged between the fixed member and a friction member of the elevator brake, and arranged to be movable relative to the fixed member; and a force supply member, which is arranged to provide a force in an opposite direction to the electromagnetic force to the movable member.

A brake static plate assembly, a brake and an elevator system. The brake static plate assembly includes a first static plate and a second static plate. The first static plate includes a first outer edge and a second outer edge which are adjacent to each other; a first inner edge provided with a first shaft mounting notch thereon; a first set of coils disposed on a braking surface of the first static plate. The second static plate includes: a third outer edge and a fourth outer edge which are adjacent to each other; the second inner edge which is matched with the first inner edge and is provided with a second shaft mounting notch which forms a shaft mounting hole of the drive shaft together with the first shaft mounting notch; the second set of coils are disposed on the braking surface of the second static plate.

In a method for monitoring the operation of an electric motor and a lifting mechanism, the motor current is acquired, and the electric motor has, for example, an electromagnetically actuable brake, e.g., a holding brake. In the method, a pre-magnetization is performed when the electric motor is switched on, the characteristic of the acquired values of the motor current is monitored for an exceeding of a permissible measure of deviation from a setpoint characteristic, and a brake of the electric motor is activated, e.g., remains applied.

In a method for monitoring the operation of an electric motor and a lifting mechanism, the motor current is acquired, and the electric motor has, for example, an electromagnetically actuable brake, e.g., a holding brake. In the method, a pre-magnetization is performed when the electric motor is switched on, the characteristic of the acquired values of the motor current is monitored for an exceeding of a permissible measure of deviation from a setpoint characteristic, and a brake of the electric motor is activated, e.g., remains applied.

The invention relates to a free fall winch comprising a drum, which can be rotationally driven by a winch drive, wherein a free fall brake is provided for braking the drum in free fall operation. According to the invention, a torque acting on the free fall winch, which depends on the free fall braking torque, is detected by means of a detection device, and a brake actuation force with which the free fall brake is actuated is controlled or adjusted by a control device according to the detected torque.

To achieve a size reduction by on-off controlling non-contact switching devices with a microcomputer. When a three-phase alternating-current electric motor is to be used, lead wires of the three-phase alternating-current electric motor are connected to output terminals of a control board. When a single-phase alternating-current electric motor is to be used, two supply terminals of the control board are electrically connected together through a first connecting member, and one end of the first connecting member is defined as a single-phase alternating-current power supply terminal. A second connecting member is connected to a supply terminal, and one end of the second connecting member is defined as a single-phase alternating-current power supply terminal. A main winding of the single-phase alternating-current electric motor is connected to the output terminals, and an auxiliary winding is connected to the output terminal and the second connecting member.

A brake device includes: a fixed member; a moving member which is movable between a retracted position in which the moving member is adjacent to the fixed member and separate from a braking member, and a braking position in which a friction plate of the moving member contacts the braking member and provides a braking force to the braking member; an elastic member connected between the moving member and the fixed member; a coil disposed in the fixed member; and a controller which provides an operating current to the coil when the elevator is in normal operation, wherein the controller is configured to implement a test mode in which the controller provides a test current less than the operating current to the coil and determines whether the moving member has been attracted to the retracted position.

An elevator brake (20) has at least one brake disc (30) comprising a metal matrix composite, the metal matrix composite including at least an aluminum alloy and silicon carbide. The metal matrix composite in particular comprises Aluminum 6061, silicon carbide and redmud.