- What do you mean by poor commutation?
- Why commutator is needed?
- What is the difference between slip ring and commutator?
- Why do we use slip rings in AC generator?
- Can commutator convert AC to DC?
- What is the purpose of brush?
- How does a commutator work?
- What is ideal commutation?
- What is the slip?
- What is the main function of commutator?
What do you mean by poor commutation?
A machine is said to be in poor commutation if there is sparking at the brushes and commutator surface.
Poor commutation can be caused by mechanical or electrical condition..
Why commutator is needed?
To keep the torque on a DC motor from reversing every time the coil moves through the plane perpendicular to the magnetic field, a split-ring device called a commutator is used to reverse the current at that point.
What is the difference between slip ring and commutator?
Functionally, slip rings provide a continuous transfer of power, signals, or data. Specifically, in AC motors, they transfer resistance to the rotor windings. Commutators, on the other hand, are used in DC motors to reverse the polarity of current in the armature windings.
Why do we use slip rings in AC generator?
The function of slip ring in an AC generator is that these are the hollow rings that are connected to the ends of the armature coil. They help in rotation of the coil. Also, they provide electric contact with the brushes.
Can commutator convert AC to DC?
In DC Generator the commutator converts from AC induced current produced in the armature windings is converted to DC and gives to the external load connected. … Thus Commutator in a DC machine converts both AC to DC and DC to AC.
What is the purpose of brush?
The material of both the block and bristles or filaments is chosen to withstand hazards of its intended use, such as corrosive chemicals, heat or abrasion. It is used for cleaning, grooming hair, make up, painting, surface finishing and for many other purposes.
How does a commutator work?
A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine.
What is ideal commutation?
(also called straight-line commutation) is that in which the current of the commutating coils changes linearly from + to in the commutation period as shown in Fig. 7.15. The figure also shows delayed commutation and the current in the spark.
What is the slip?
Definition: The slip in an induction motor is the difference between the main flux speed and their rotor speed. The symbol S represents the slip. It is expressed by the percentage of synchronous speed.
What is the main function of commutator?
On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.