Contents
Why equalizer ring is not used in wave winding?
Equalizer Ring: As in lap winding number of parallel path is more, there would be severe sparking at brushes due to difference in currents in different parallel paths. But in wave winding number of parallel paths is 2 and the sparking at commutation is less.
Why equalizer connection is necessary for the armature winding of a DC machine with lap winding?
In lap winding all the conductors in any parallel path lie under one pair of poles. If flux from all the poles is exactly the same, the induced emf in each path hence current carried by each path will be equal.
Why equalizer rings are needed in lap winding?
In lap winding the numbers of parallel path are equal to the total of number poles and is used in low voltage and high current dc machines. Hence, the function of equalizer rings is to avoid unequal current distribution at the brushes and to reduce sparking between brushes and commutator.
Why wave winding is used for high voltage?
The conductors in each of the two parallel paths distributed around the armature in the entire circumference. For a given number of poles and armature conductors, it gives more emf than that of lap winding. Hence wave winding is used in high voltage and low current machines.
What is the difference between lap and wave winding?
The main difference between these two is, in the lap winding, One of the major difference between them is that in a lap winding, the last part of every coil is associated with the nearby sector while in the wave winding the last part of armature coil is associated with the commutator sector at a distance apart.
What is a wave winding?
: an armature winding in which the coils are laid in two layers and follow each other on the surface of the armature in the form of waves with the coils being so connected in series that there are only two paths for the flow of current whatever the number of poles in the machine.
Which winding is used for High Voltage?
Difference between Lap Winding and Wave Winding
| Lap Winding | Wave Winding |
|---|---|
| The winding cost of the lap winding is High | The winding cost of the wave winding is Low |
| The lap winding used for high current, low voltage machines. | The applications of wave winding include low current and high voltage machines. |
Why are they needed on a lap wound machine but not on a wave wound machine?
To reduce the circulating current, points on the winding which should be at the same potentials are brought to the same potentials by connecting them with conductor. These connections called equalizer connections confine the circulating current to the winding, thus reducing the sparking at the brushes.
What are the types of winding?
The lap winding applications mainly involve in high current and low voltage machines. These windings are categorized into three type’s namely simplex, duplex and triplex type winding.
What is the condition of retrogressive winding?
What is the condition of retrogressive winding? Explanation: The coil side displacement of the front-end connection is called the front-pitch. The coil side displacement of the back-end connection is called the back-pitch. The direction in which the winding progresses depends upon which is more, Yb or Yf.
What is the value of YF for a lap winding with a 4 pole 12 commutator segment with two coil sides slot?
number of commutator segments to the number of poles. commutator segments= 12, Number of poles= 4. YCS= 12/4= 3. Yf =Yb + 2= 7+2= 9.
How to make an equalizer connection in a PF winding?
To make these equalizer connections, the number of coils should be multiples of the number of poles and the number of coils per pole should be divisible by a small number 2 or 3. As an example assume a 4-pole generator having 24 coil sides. The number pf coil sides per pole will be 6. The winding with equalizer connections is shown in Fig. 1.
How many PF coils are connected to equalizer?
The number pf coil sides per pole will be 6. The winding with equalizer connections is shown in Fig. 1. Note that every 3rd coil is connected to an equalizer. The coils that are connected to the same equalizer occupy the same position relative to the poles. This is necessary as such coils, at any instant, should be generating the same emf.
How are coils placed in a wave winding machine?
These coils are placed in slots to preserve the balance of machine but are not electrically connected to the balance of machine but are not electrically connected to the rest of the winding. Say for example it is desired to have a simple wave winding for 16 slots, each slot accommodates two coils sides in a 4-pole machine.
Which is better wave winding or lap winding?
For a given number of poles and armature conductors it gives more emf than that of lap winding. Hence wave winding is used in high voltage and low current machines. This winding is suitable for small generators circuit with voltage rating 500-600V.