Which Motor Is Used 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.

What type of motor is used in a crane?

Wound field DC motors ⁴ (series, shunt or compound) are used in industrial environments for coil feeding reels in the milling/metalforming, crane hoists, motor-driven cable reels, and elevator hoist motors.

Why is DC series motor used in crane?

Explanation: DC series motor is used where high starting torque is required, thus in cranes and hoists DC series motor is used widely. Torque-speed characteristics of DC series motor suits perfectly to these applications.

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.

Which motor is used in lift?

Lifts are preferred by AC slip ring or DC compound motor. In case of single phase installation, the commutator motors are preferred. Variable Frequency drive electronic controls are used in the latest lift designs.

Why is the DC motor preferred over AC motor?

Because DC motors have higher starting torque compared to AC motors, they are preferred for applications like electrical traction. They are considered ideal for dealing with heavy loads for starting conditions in machines such as locomotives and cranes.

Which motor is comfortable within the crane?

Synchronous motor. For crane travel, trolley travel and boom hoist of traveling crane requires high starting torque and constant speed in operation. Hence slip ring induction motor is preferred.

What are the parts of DC motor?

What are DC Motor Parts and how they work? Stator. A stator is one of the DC motor parts that is, as the name suggests, a static unit containing the field windings. Rotor. Yoke. Poles. Field Windings. Armature Windings. DC Motor Commutator. Brushes.

What are the two main parts of DC motor?

DC motors include two key components: a stator and an armature. The stator is the stationary part of a motor, while the armature rotates. In a DC motor, the stator provides a rotating magnetic field that drives the armature to rotate.

What are the applications of DC motor?

Application of DC Series motor Cranes. Air compressor. Lifts. Elevators. Winching system. Electric traction. Hair drier. Vacuum cleaner and in speed regulation application.

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.

What is electric braking of DC motor?

The electric braking of a DC motor is of three types, (i) Rheostatic or dynamic braking, (ii) Plugging or reverse current braking and (iii) Regenerative beaking. (ii) Plugging or Reverse current braking: In this method, armature connections are reversed and hence motor tends to run in opposite direction.

How much weight can a 1 hp motor lift?

The constant 1 horsepower equals 550 foot-pounds per second. In other words, 1 horsepower is the amount of work required to move a load of 550 pounds over 1 foot, in 1 second.

Which motor is constant speed?

A DC motor can be referred to as a constant speed motor because it can self- regulate its speed.

Which motor is used in shears?

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. So, this motor suits well to shears and punches application.

Which is better AC or DC motor?

AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.

What are the disadvantages of DC motors?

Disadvantages of DC motors High initial cost. Increased operation and maintenance cost due to the presence of commutator and brush gear. Cannot operate in explosive and hazard conditions due to sparking occur at brush (risk in commutation failure).

Why do we need DC motors?

DC motors offer highly controllable speed. By changing the armature or field voltage it’s possible to achieve wide speed variation and with this level of controllability, DC motors offer the precision required by a wide range of industry applications.

What is the speed of dc motor?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

What happens if we give AC supply to DC motor?

We already know that in a DC Series motor the field winding has very less resistance than a DC Shunt Motor as the field is connected in series with the Armature Winding. So if we give AC supply on a DC Series Motor it will run perfectly. In fact, DC Series can run on both AC and DC supply.

How do you choose a crane motor?

Most vital and primary technical consideration for selection of the motor for any particular application is the torque required by the load during starting and acceleration periods, especially the relationship between the maximum torque or breakdown torque generated by the motor and the start-up torque or locked rotor Jul 27, 2013.

What are the 4 types of DC motor?

There are 4 main types of DC motors: Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux. Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current. Shunt DC Motors. Compound DC Motors.

What are the 4 main parts of a DC motor?

The basic parts of a brushed DC motor are: Case, bearing and stator magnets (stator, i.e. stationary), Motor shaft and washers, Armature / rotor, Commutator (and sometimes a Varistor), and. Brushes and terminals or leads.