Double hoist drive using load coupled hold and close...

Details Double hoist drive using load coupled hold and close... Double hoist drive using load coupled hold and close...

E - Fixed Constructions

02

F

E02F 9/20 (2006.01) B66C 3/12 (2006.01) B66C 13/38 (2006.01)

Patent

CA 2049221

A hoist drive for a double hoist carrying member having a hold hoist drum, a hold rope connected to the hold hoist drum and from which the carrying member is suspended, and a hold motor for rotating the hold hoist drum to raise and lower the carrying member. The hoist drive further includes a close hoist drum, a close rope connected to the close hoist drum and from which the carrying member is suspended, and a close motor for rotating the close hoist drum to raise and lower the carrying member. During raising of the carrying member, the hold and close motors are each supplied with a.c. power at different preselected frequencies. The hold and close motors each operate along a first pair of intersecting frequency to torque curves during a raising operation in which the hold motor curve is steeper than the close motor curve. During a lowering operation the hold and close motors operate along a second pair of intersecting frequency to torque curves in which the hold motor curve is also steeper than the close motor curve. Due to the intersection and relative slopes of the first pair and the second pair of curves, the speed of the hold motor follows the speed of the close motor during both raising and lowering operation and the motors operate at the intersection points of the pairs of curves and share the load during both raising and lowering operation.

Affiliated with

Also associated with

Rating

Double hoist drive using load coupled hold and close... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Double hoist drive using load coupled hold and close..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double hoist drive using load coupled hold and close... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1590294