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. 07․
Which type of motor is used in EOT crane?
While series DC motors consume more power than PMDC motors to produce their electromagnetic field, they’re powerful, efficient at high speeds and produce the most torque; hence, they are used for heavy duty winches. Shunt DC motors are used in constant speed applications, 18 such as reel drives.
Which DC motor is preferred for cranes and hoists?
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 are used in most?
Ok, let’s take a short overview of twelve most basic motor types used for different industrial electric drives:
- DC Series Motor.
- DC Shunt Motor.
- Cumulative Compound Motor.
- Three phase Synchronous Motor.
- Squirrel Cage Induction Motor.
- Double Squirrel Cage Motor.
- Slip ring Induction Motor.
- Single phase Synchronous Motor.
What is hoist motor?
A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium. … Most hoists couple to their loads using a lifting hook.
What is CDF in motor?
Cyclic duration factor : (CDF) : The ratio between the period of loading including starting and electric braking and the duration of the duty-cycle expressed as percentage. … D.C. Injection braking : A form of braking of an induction motor in which a separate dc supply is used to magnetise the motor.
How many types of EOT crane are there?
There are various types of overhead cranes with many being highly specialized, but the great majority of installations fall into one of three categories: a) Top running single girder bridge cranes, b) Top running double girder bridge cranes and c) Under-running single girder bridge cranes.
Why is the DC motor preferred over AC 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.
Which DC motor has maximum self loading property?
Which DC motor has got maximum self-loading property? Explanation: A differentially compound DC motor, flux reduces so sharply at small increase in load at higher values of load. It is advisable that motor should not be used beyond some load value, as it may damage itself by self-loading. 5.
Can we change the direction of rotation of DC shunt motor?
shunt field connections. series field connections. … The direction of rotation of a DC compound motor may be conveniently reversed by reversing the connection of both series and shunt field winding or may be reversing the armature connection but not both at the same time.
What are the three types of motors?
Basic motors have been classified into three distinct types: AC motor, DC motor, and specialized motors.
What are the 6 parts of an electric motor?
These six components include:
- 1) The Rotor. The rotor is the moving part of your electric motor. …
- 3) The Bearings. The rotor in your electric motor is supported by bearings, which allow it to turn on its axis. …
- 4) The Windings. …
- 5) The Air Gap. …
- 6) The Commutator. …
- What Do All of These Components Have in Common?
Which motor is used in fan?
What is the weakest part of a chain hoist Why?
What is the weakest part point of a chain hoist? Why? It will spread when overloaded.
How many types of hoist are there?
There are three types of residential hoisting devices: Wheeled hoists. Stationary hoists. Ceiling lifts.
What is chain hoist?
If set up and used correctly, a chain hoist is one of the easiest and most efficient ways of lifting a load. A chain hoist is operated by hand. An operator will pull down on one of the chain loops on one side of the chain. This will turn a pulley mechanism inside the chain hoist housing.