What is fractional slot winding?
In Emetor, a winding is called fractional-slot winding when the number of slots per pole per phase is fractional and superior to 1. In the Emetor winding calculator, fractional slot windings with a number of slots per pole per phase strictly superior to 1 are indicated with orange cells.
What is Double Layer winding?
Double layer windings in open slots have the following advantages over single layer windings in semi-closed slots. 1. Ease in manufacture of coils and lower cost of winding 2. Less number of coils are required as spare in the case of winding repairs 3. Fractional pitch coil can be used.
What are the advantages of fractional slot windings?
The main advantage of this configuration is a smooth torque, which is due to the elimination of period- icity between slots and poles. A second advantage is a higher fault-tolerant capability, making the machine able to work even in faulty conditions.
What are the advantages of fractional slot winding over integral slot winding?
Fractional-slot windings offer certain advantages such as those mentioned above, but the slots are not distributed uniformly among poles, which results in even and fractional harmonics in armature magnetomotive force (MMF), as distinct from integral-slot windings.
What are the three types of armature winding?
Types of Armature Winding
- Simplex Type Lap Winding.
- Duplex Type Lap Winding.
- Triplex Type TLap Winding.
What is the significance of fractional pitch and fractional-slot windings in a synchronous generator?
The number of slots per phase per pole is a fractional then it is known as “fractional-slot winding”. But the total number of slots must be multiples three (3). This helps to maintain symmetrical winding. The advantages of these windings are, o Reduces the high-frequency harmonics in the emf and mmf wave forms.
Which type of armature winding is?
Types of Armature Winding:
| Sr. No. | Types of Armature Winding |
|---|---|
| #1. | Single Phase and Poly Phase Armature Winding |
| #2. | Concentrated Winding and Distributed Winding |
| #3. | Lap, Wave and Concentric or Spiral Winding |
| #4. | Single Layer and Double Layer Winding |
What is single layer and double layer?
Single-layer boards, sometimes called single-sided boards, have components on one side of the board and a conductor pattern on the opposite side. Double-sided PCBs, like the single-sided variation, have one substrate layer. The difference is that they have a layer of conductive metal on both sides of the substrate.
What are the advantages and disadvantages of short pitched winding?
Advantages of short-pitched winding are: They save copper of end connection, They improve the wave-form of generated emf i.e generated emf can be made to approximate to a sine wave more easily and the distorting harmonics can be reduced or totally eliminated.
What is the range of armature slot pitch in the armature slot design?
What is the range of armature slot pitch in the armature slot design? Explanation: For the armature design, the lowest value of slot pitch is generally chosen as 25mm. The highest value of slot pitch is generally chosen as 35mm.
What are the advantages of short Chorded winding?
Advantages of Short Pitch Coil or Chording It shortens the ends of the winding and, therefore, there is a saving in the conductor’s material. It reduces the effects of distorting harmonics and thus the waveform of the generated voltage is improved and making it a sine wave.
What are the difference between the 2 armature winding?
Armature Winding is the winding, in which voltage is induced. Field Winding is the winding in which the main field flux is produced when the current through the winding is passed.
When is a winding called a fractional slot winding?
Fractional-slot winding In Emetor, a winding is called fractional-slot winding when the number of slots per pole per phase is fractional and superior to 1. In the Emetor winding calculator, fractional slot windings with a number of slots per pole per phase strictly superior to 1 are indicated with orange cells.
How are design and analysis of a fractional slot concentrated?
Detailed curves which describe e\ciency, power factor and current with respect to ambient temperature are studied for the proposed motor designs at di\erent working points. The demagnetization risk is also taken into account and the safe working temperature ranges have been de\\fned for all the considered motors.
Where did I do my master thesis on fractional slot?
This master thesis has been carried out at ABB LV Motors, Vaster\s (Sweden) within a Double Degree Programme between Politecnico di Torino (Italy) and KTH Stockholm (Sweden).
What kind of motor is used for fractional slot?
The general industrial trend is to substitute the induction motors, largerly installed in the past decades, with permanent magnet synchronous motors, typically characterized by higher e\ciency and torque density.