Crane Hoist
Can someone explain to me in details (with example, figure, etc) of Electric Drives in crane/ hoist system?
This is Electric Machine & Drives subject
how the electric drives work in the hoist?
The primary function of an electronic drive is to provide for operation at various speeds. Slow speed operation is used when moving a load into position. Faster speeds are used for moving loads over longer distances. When the operating speed is steplessly adjustable, ramped acceleration and deceleration control is easily provided as well. Controlled acceleration provides smoother operation because acceleration at a constant rate means accelerating with a constant force or torque.
Electronic drives control torque and current during starting. They perform a function similar to a reduced voltage motor starter, but they do it steplessly, more efficiently, with more complete control of applied torque. They provide more torque per ampere of current than any other starting method. This is very beneficial for the frequent starting and stopping often required for cranes.
Electromechanical motor controls for cranes require additional contactors, relays and other components to perform functions such as reversing, motor overload protection and braking. These functions are incorporated into the electronic controls with electronic drives. Electronic braking can return energy to the power supply and bring the load to nearly a complete stop before a friction brake is applied. For holding the load in position, an electromechanical brake is still required.
Electronic drives can be used on bridge, trolley and hoist applications.
http://www.jherbertcorp.com/acc-vfd.htm
http://meerholz.ca/sales/variable-speed-controls-hoist-monitors/vfd-s---crane-inverter-control-systems
http://www.ipandc.com/acatalog/Crane_Motor_Control.html
http://www.wazeecrane.com/accessories.html
Re additional details
Electric motors turn a drum to wind and unwind a cable to raise and lower the hoist. Other motors are used to move the hoist horizontally. Cranes usually have a motor on each end of the trolly to drive the wheels that move it back and forth. A motor drives the traverse mechanism to position the hoist from side to side. Electronic controllers control the speed, direction and torque of the motors.
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