What is the construction of synchronous motor?
The Construction of Synchronous Motors A synchronous motor is generally made up of two parts, a stator the stationary part of the machine that carries the armature winding in which the voltage is generated, and a rotor the rotating part of the machine that produces the main field flux.
What are the classification of synchronous machine based on its construction?
Based on the armature winding and field winding arrangement, synchronous machines are classified into two types: Rotating Armature type and Rotating Field type. In rotating armature type, the armature winding is housed in the rotor.
What is the purpose of synchronous machine?
In higher power industrial sizes, the synchronous motor provides two important functions. First, it is a highly efficient means of converting AC energy to work. Second, it can operate at leading or unity power factor and thereby provide power-factor correction.
What are the parts of the synchronous machine name the material used in various parts?
Construction of a Synchronous Machine
- Construction of a Synchronous Machine, i.e. alternator or motor consists of two main parts, namely the stator and the rotor.
- Spider: It is made of cast iron to provide an easy path for magnetic flux.
- Pole Core and Pole Shoe: It is made of laminated steel sheet material.
What is the construction of induction motor?
The stator frame consists of laminations of silicon steel, usually with a thickness of about 0.5 millimetre. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors.
What is Alternator and its types?
Types of Alternators Automotive alternators – used in modern automobiles. Diesel-electric locomotive alternators – used in diesel-electric multiple units. Marine alternators – used in marine applications. Brushless alternators – used in electrical power generation plants as the main source of power.
What are the main characteristics of a Synchronous Motor?
Main Features of Synchronous Motors
- Synchronous motors are inherently not self starting.
- The speed of operation of is in synchronism with the supply frequency and hence for constant supply frequency they behave as constant speed motor irrespective of load condition.
Why DC supply is used in Synchronous Motor?
When AC supply is given to the stator winding or static armature winding of the synchronous motor it creates a rotating magnetic field. If we give DC supply to the field winding or rotor winding of the synchronous motor then the pole created in the rotor will be constant.
Is synchronous machine AC or DC?
In a synchronous motor, AC power is supplied to the stator to generate a rotating magnetic field. DC power is supplied to the rotor which results in discrete North (N) and South (S) poles.
Where is synchronous machine used?
Synchronous motors are normally used in applications in which a constant and precise speed is required. Typical applications of these low power motors are positioning machines. They are also used in robot actuators. Synchronous motors are also used in ball mills, watches, record players, and turntables.
Why would rotor construction is adopted?
Why wound rotor construction is adopted? The wound rotor has the facility of increasing the rotor resistance through slip rings. High value of rotor resistance is need during starting to get a high value of starting torque.
How is power supplied in a synchronous machine?
In rotating field type synchronous machine, filed winding is wound on the rotor. DC supply is extended to the field winding by assembly of slip ring and carbon brush. Electrical power is supplied to the load using stationary terminals mounted on the stator.
How are rotors used in synchronous machines?
Rotors are made laminated to reduce eddy current losses. Construction of synchronous machines Two common approaches are used to supply a DC current to the field circuits on the rotating rotor: 1. Supply the DC power from an external DC source to the rotor by means of slip rings and brushes;
How is the field created in a synchronous machine?
The rotor would be placed inside the stator. Instead of a permanent magnet, this machine (as do the overwhelming majority of synchronous machines) uses an electromagnet to create the field. A DC voltage is applied to the coils on the rotor, creating north and south poles.
How is a salient pole synchronous machine constructed?
A salient pole synchronous machine has a non-uniform air gap. The air gap is minimized under the pole centers and it is maximum in between the poles. They are constructed for medium and low speeds as they have a large number of poles. A salient pole generator has a large diameter.
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