1. Which DC motor is generally preferred for cranes and hoists? Explanation: DC series motor is used where high starting torque is required, thus in cranes and hoists DC series motor is used widely.
Which type of motor is used for lifting purpose in crane?
Answer: As the purpose of the crane is to lift heavy load through rope or chains, so it demands a kind of motor, which has a very high starting torque to lift the load at low current. Squirrel cage induction motor has the problem of low starting torque due to low resistance.
Which type of motors are preferred in lifts?
AC slip ring or DC compound motors are prefer for lifts. Shunt type commutator motors are preferred in case of single phase installation. The latest lift designs use 3-phase induction motors with variable frequency drive electronic controls.
Which of the following motor is used in hoist and traction?
Explanation: DC motors are used for traction as, according to the characteristics of DC motors speed is inversely proportional to torque and square of armature current as well, if linear magnetization is concerned. Thus, DC motors are perfectly suitable for traction. 2.
Which type of DC motor is used in elevators?
DC cumulative compound motor having high starting torque up to 450% depending upon the degree of compounding. The speed regulation is varying up to 25 ~ 30%. That’s why these motors are used in elevators.
Why DC motors are used in cranes?
DC series motor is best suited for DC traction, cranes as it provides high starting torque and easy speed control which is primary requirement of DC traction.
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.
Which DC motor is preferred for constant speed?
Which D.C motor is preferred for machine tools? Explanation: DC shunt motor is a constant speed motor tool machine such as lathe machine requires being run at a constant speed.
Which DC motor is used for 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.
Which type of DC motor is suitable for shearing machines?
3. Which DC motor is used in shears and punches? Explanation: Cumulative compound DC motor provides high starting torque which is required at instant of starting in shears and punches. It also provides good speed regulation in order to vary pressure.
Which of the following motor is best suited for crane and lift?
Detailed Solution. DC series motor: It has a very high starting torque. Hence it is used for heavy-duty applications such as traction, driving cranes, hoists, large lifts, air compressors……etc.
Which motor is preferred for boom hoist of Travelling Crane?
Single phase motor.
Why is the DC motor preferred over AC motor?
D.C. motor is preferred over an A.C. motor when we need variable speed operation because As in DC series motor field winding and armature winding is in series. So whenever armature current changes field current also changes as they are same due to which its torque changes rapidly and we get a variable speed.
How is DC motor used in elevator?
Cumulative Compound DC Motors are used for Elevators or Lifts because it has Variable Speed, Adjustable varying speed and High starting torque. The latest elevator or lifts designs use 3-phase induction motors with variable frequency drive electronic controls.