Contents
How do you create a synchronous machine?
Synchronous machines are generally designed with larger air gap length compared to that of Induction motors. Estimation of length of air gap: Length of the air gap is usually estimated based on the ampere turns required for the air gap. equal to 80% of the no load field ampere turns per pole.
How many design steps are involved in the design of main dimensions of synchronous machine?
How many design steps are involved in the design of main dimensions of synchronous machine? Explanation: There are 10 steps in the flowchart of design of the main dimensions of synchronous machines.
What are the main parts of synchronous machine?
The stator and rotor are the two main parts of the synchronous motor. The stator is the stationary part, and the rotor is the rotating part of the machine. The three-phase AC supply is given to the stator of the motor.
What are the parameters of a synchronous machine?
The resistance and reactance of the stator, rotor and magnetizing branch, field and damper windings are major parameters of the synchronous machine.
What is peripheral speed of synchronous machine?
The maximum peripheral speed is about 140 to 150 m/s for salient pole synchronous generator and 175 to 180 m/s for turbo generator. The rotor diameter design is limited by this maximum peripheral speed.
What is the formula for rotor turns per phase?
8. What is the formula for rotor turns per phase? Explanation: Firstly, the winding factor for stator is obtained along with the winding factor for stator. Next the ratio of the rotor voltage per phase to the stator voltage per phase.
Why are slot made deeper in the machine?
Why are slot made deeper in the machine? Explanation: The slots used in the machine are basically deeper slots. The slots are made deeper even more to increase the leakage reactance and to limit the short circuit current.
What are the two types of synchronous generators?
Types of synchronous machines
- Hydrogenerators : The generators which are driven by hydraulic turbines are called hydrogenerators. These are run at lower speeds less than 1000 rpm.
- Turbogenerators: These are the generators driven by steam turbines.
- Engine driven Generators: These are driven by IC engines.
What are the two types of synchronous machines?
Based on the armature winding and field winding arrangement, synchronous machines are classified into two types: Rotating Armature type and Rotating Field type.
What are generator parameters?
The synchronous generator fundamental electrical parameters are: the per phase stator windings electrical resistance (rs), the field winding (rfd), the d and q-axis damping winding electrical resistances (rkd and rkq), the per phase stator windings leakage reactance (xls), the field winding leakage reactance (xlf), the …
Where damper winding is used?
Functions of Damper Windings: Damper windings helps the synchronous motor to start on its own (self starting machine) by providing starting torque. By providing damper windings in the rotor of synchronous motor “Hunting of machine”can be suppressed.
How are synchronous machines made in a generator?
Construction of synchronous machines In a synchronous generator, a DC current is applied to the rotor winding producing a rotor magnetic field. The rotor is then turned by external means producing a rotating magnetic field, which induces a 3-phase voltage within the stator winding.
What kind of rotors are used in synchronous machines?
The rotor of a synchronous machine is a large electromagnet. The magnetic poles can be either salient (sticking out of rotor surface) or non- salient construction. Non-salient-pole rotor: usually two- and four-pole rotors. Salient-pole rotor: four and more poles. Rotors are made laminated to reduce eddy current losses.
What is the purpose of synchronous machine modeling?
Synchronous Machine Modeling •Electric machines are used to convert mechanical energy into electrical energy (generators) and from electrical energy into mechanical energy (motors) –Many devices can operate in either mode, but are usually customized for one or the other
How are slip rings used in a synchronous machine?
Supply the DC power from a special DC power source mounted directly on the shaft of the machine. Slip rings are metal rings completely encircling the shaft of a machine but insulated from it. Graphite-like carbon brushes connected to DC terminals ride on each slip ring supplying DC voltage to field windings.