Series DC motors are used in hoisting or winching operations because of their characteristic very high starting torque.
What is hoist motor?
The hoist motor as container cranes drive using large energy at the container terminal. Hoist motor of container crane serves to move the spreader in the direction up or down. Worked continuously during loading and unloading operations. The CC hoist motor is the largest motor, mounted on machinery house.
What type of motor is used in crane?
Conventional AC operated crane drives use slip ring induction motor whose rotor windings are connected to power resistance in 4 to 5 steps by power contactors.
Do cranes use DC motors?
Many older cranes operate on DC power because when those controls were built, DC was easier to supply and provided the power load necessary to drive large, robust pieces of equipment. But as technology advanced AC power also advanced.
Why is the DC motor preferred over AC motor?
DC motors have the advantage of: higher starting torque, quick starting and stopping, reversing, variable speeds with voltage input and they are easier and cheaper to control than AC. AC motor advantages include: lower power demand on start and minimal maintenance.
Are cranes AC or DC?
While the vast majority of new cranes manufactured today utilize AC drive technology, significant reasons still exist to modernize your crane with today’s state of the art DC drive controls.
Which motor is not suitable for crane application?
Squirrel cage induction motor has the problem of low starting torque due to low resistance. Therefore, they are not suitable for applications like crane or lifts. On the other hand, a slip ring induction motor is also similar to the normal Squirrel cage induction motor.
Which DC motor is used for the conveyor?
So that, the DC series motor is used in conveyors as it provides very high starting torque, which is practically 5 times the rated torque. Applications of different DC motors are given below. DC Series wound motor: It has a very high starting torque.