What are the types of rotor construction used in synchronous machines?
What are the types of rotor construction used in synchronous machines?
Rotor Construction. The rotating part of the machine is called the Rotor. There are two types of rotor construction, namely the salient pole type and the cylindrical rotor type.
What are the two main components of the rotor?
In the case of a motor, the core is divided into the stator core and the rotor core, and a magnetic circuit is configured through the air gap in between….Stator and rotor in different languages.
| Stator | Rotor | |
|---|---|---|
| English | stator | rotor |
| German | Ständer, Stator | Läufer, Rotor |
| Spanish/Portuguese | estator | rotor |
How many Poles does a rotor have?
As shown in Figure 9, the stator has six magnetic poles and the rotor has two poles.
What are the different methods of starting synchronous motor?
The different methods used to start a synchronous motor are :
- Using Pony Motors : By using the small pony motors like a small induction motor, we can start the synchronous motor.
- Using Small D.C. Machine :
- Using Damper Winding :
- As a Slip Ring Induction Motor ( Synchronous Induction Motor ) :
What are the different types of rotor used in induction motor?
There are two types of induction motor rotors:
- Squirrel-cage rotor or simply cage rotor.
- Phase wound or wound rotors. The motors that use this type of rotor are known as Slip-ring rotors.
What type of pole is used in synchronous motor?
salient pole rotor
Cylindrical, round rotors, (also known as non salient pole rotor) are used for up to six poles. In some machines or when a large number of poles are needed, a salient pole rotor is used. The construction of synchronous motor is similar to that of a synchronous alternator.
What is the rpm of a 2 pole motor?
3,600 rpm
A two-pole motor operates at 3,600 rpm (7,200 rpm ÷ 2) unloaded, and approximately 3,450 under load. Two-pole motors often are found in pump applications, such as sump pumps, swimming pool pumps, and water recirculating equipment.
What is pole in rotor?
The projected poles are made up from laminations of steel. The rotor winding is provided on these poles and it is supported by pole shoes. Salient pole rotors have large diameter and shorter axial length. They are generally used in lower speed electrical machines, say 100 RPM to 1500 RPM.
Why damper winding is used in synchronous motor?
The main purpose of using Damper winding in synchronous Machine is to provide starting torque and eliminate damping or hunting. The damper winding is used in Synchronous Motor to provide starting torque and the damper winding is used in the synchronous alternator to eliminate damping or hunting.
What is rotor construction?
The rotor is a cylindrical core made of steel lamination with slots to hold the wires for its 3-phase windings which are evenly spaced at 120 electrical degrees apart and connected in a ‘Y’ configuration. The external resistances become a part of the rotor circuit to produce a large torque when starting the motor.
What is the difference between 2 pole and 4 pole rotors?
Unlike 2-pole rotors, 4-pole rotors have a bolted pole tip and no retaining rings – which means mainte- nance of 4-pole rotors is fast and easy. The lower speed of 4-pole motors and generators, compared to 2-pole motors and generators, means that they are subject to less general wear and tear.
What is a 2 pole motor?
2 pole motor is a type of motor that has two magnetic poles or a pair of magnetic pole. Rotor of the 2 pole motor completes one cycle for every cycle of the source. A 2 pole motor shows a north-south configuration. 2 pole motor has high speed due to less number of poles.
What is the construction of non-salient pole rotor?
The construction of non-salient pole rotor ( cylindrical rotor) is as shown in figure above. Sometimes, they are also called as drum rotor. They are smaller in diameter but having longer axial length.
What are the different types of rotors of an electrical machine?
Rotors of an electrical machine are classified as: (i) Salient pole rotors and (ii) Non-salient pole rotors. Both types are explained below. In salient pole type of rotor consist of large number of projected poles (salient poles) mounted on a magnetic wheel.
