Embodiments herein relate to a permanent magnet (PM) motor driven hoist with a motor based electromagnetic brake. The hoist includes a direct current (DC) power source, a PM motor having stator coils and a PM rotor operably coupled to a cable drum with a cable wrapped thereon. The hoist also includes a controller operably connected to the direct current power source and the PM motor, wherein the controller is configured to control the PM motor employing a method to brake the PM motor. The method includes generating control signals in the controller based on a position of the PM motor, applying a braking command signal to the PM motor to magnetically lock the PM rotor of the PM motor for a selected duration, removing the braking command signals for a second selected duration, and repeating the generating, applying, and removing until the PM motor has stopped.

A headlock lift including a base having a left column and a right column, with each column having a lower side and an upper side. A forward cross-spinning beam and a back cross-spinning beam both connect to the upper side of each column. A moveable gate having a topside, a bottom side, and a plurality of vertical poles fixably attachable to the top side and the bottom side, the moveable gate is slidably received over left and right pipes positioned parallel to the left and right columns. Two pulleys are fixed to the forward cross-spinning beam and two winches are fixed to the back cross-spinning beam. Two cables are continually disposed between the two winches and the two pulleys, with the cables each having a free operating-end attachable to the topside of the moveable gate and a captive-end attachable to a respective one of the winches.

A tower crane under safety management and control includes a cargo boom, a spool and a pulley located on the cargo boom, a motor coupled to the spool, a hook, a 3D camera module, and a controller coupled to the 3D camera module and the motor. A tow rope of the spool rolls around the pulley and connects the hook. The 3D camera module includes a first camera facing the hook and a second camera back to the hook. The first and second cameras respectively take images, in real time. The controller obtains the images taken by the first camera when lifting a load downwards, obtains the images taken by the second camera when lifting the load upwards, detects whether there are obstacles within the images; and controls the motor reducing working speed or stopping working when there is an obstacle within the images.

A rope hoist includes a rope drum mechanism easy to attach to a frame structure and clarified positioning reference. The rope drum is rotatably supported by a first support part on one end side and a second support part on another end side of the rope drum. A pair of supporting ribs having clearances with respect to a first drum support frame is provided with the first support part. A first connection member penetrates the supporting ribs and the first drum support frame in a state of both-end support. A second connection member penetrates a frame attachment portion and a second drum support frame in a state of cantilever. A support shaft couples the first support part and the second support part and is arranged on an axis passing through a position different from positions of the first connection member and the second connection member.

The present disclosure relates to a control unit for controlling operation of a hoist in a load slip condition. The hoist may include a motor coupled to a winding drum for lifting and lowering a load. The control unit may include a processor and a memory communicatively coupled to the processor. The memory may store processor executable instructions, which, on execution, cause the processor to operate the hoist for selectively lifting and lowering a load between a first position and a second position upon detecting a load slip condition. The processor may operate the hoist based on parameters pertaining to transport of the load. The control unit may be configured to reciprocate the load in a load slip condition to prevent overheating and failure of a motor, thereby preventing a fall of the load in a work area.

A drawworks system for a mineral extraction system includes a drum mounted on a drum shaft and configured to support a cable. The system also includes a gearbox assembly having a gearbox housing, a gearbox supported by the gearbox housing and having a gearbox input shaft and a gearbox output shaft, wherein the gearbox input shaft is configured to be coupled to at least one motor and the gearbox output shaft is coupled to the drum shaft to drive rotation of the drum shaft and the drum, and a brake supported by the gearbox housing and coupled to the drum shaft to block rotation of the drum shaft and the drum, wherein the gearbox and the brake are positioned on one side of the drum along an axial axis of the drawworks system.

A drawworks system for a mineral extraction system includes a drum mounted on a drum shaft and a motor assembly configured to drive rotation of the drum. The motor assembly includes a motor, a variable frequency drive positioned vertically above the motor relative to a skid, and a cooling assembly configured to cool the motor and the variable frequency drive. The cooling assembly is coupled to a housing of the variable frequency drive and is positioned vertically above a drive shaft of the motor relative to the skid.

A system for a mineral extraction system includes a shaft rotatably supported on a platform, a first motor having a first output shaft that is coupled to a first end portion of the shaft to drive rotation of the shaft, and a second motor having a second output shaft that is coupled to a second end portion of the shaft to drive rotation of the shaft. The system is devoid of a transmission between the first motor and the shaft.

A method for detecting a worn link in a chain of a host arrangement includes measuring a first signal while the hoist operates. A hoist arrangement and use of a signal for detecting a worn link in a chain are also disclosed.

A system for servicing a pulverizer includes a pulverizer having a housing, a journal assembly pivotally connected to the housing, a grinding mechanism operatively connected to the journal assembly, and an opening within the housing adjacent to the journal assembly and providing an access point to an interior of the housing, and a hoist apparatus mounted to the housing. The hoist apparatus includes a frame assembly received about the opening in the housing, a sheave assembly including a plurality of sheaves supported by the frame assembly, a motor operatively connected to one of the plurality of sheaves, and a cable received by the sheave assembly. The motor is operable to at least one of retract the cable through the sheave assembly to rotate a component out of the pulverizer through the opening and controllably let out the cable to rotate the component into the pulverizer through the opening.