What are the disadvantages of a commutator?
The disadvantages of commutators are high consumption of electrical-grade copper, sparking, and wear caused by brush friction.
What is the use 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.
What are the advantages and disadvantages of DC motor?
Advantages and Disadvantages of DC Motors
- They are suitable for low-speed torque.
- They have adjustable speed.
- They offer a wide range of speed control both below and above the rated speed.
- They have a very high and strong starting torque.
What are the disadvantages of DC generator?
Like other machines, DC generators have some disadvantages, such as: DC generators can’t be applied to a transformer. DC generators have low efficiency because there are copper losses, eddy current losses, hysteresis losses, and mechanical losses. A voltage drop over long distances would occur.
Which is better for wind turbine generator AC or DC?
AC power is better for transmission, the nature of AC current means greater current can be sent over father distances more efficiently. 2. DC power is better for electronics and circuits since they all work based on continuous voltage.
What is a DC generator used for?
A DC generator is an electrical machine whose main function is to convert mechanical energy into electricity. When conductor slashes magnetic flux, an emf will be generated based on the electromagnetic induction principle of Faraday’s Laws.
Is generator a DC or AC?
An AC generator creates an alternating current that periodically reverses direction. But in a DC generator, a direct current flows in one direction. In an AC generator, the coil through which current flows is fixed and the magnet usually moves.
What is the working principle of a DC generator?
DC generator operates on the principle of the dynamically induced electromagnetic force. When a conductor is placed in a varying magnetic field, an electromotive force gets induced within the conductor. This induced e.m.f magnitude is measured using the equation of the electromotive force of a generator.
What is the basic principle of generator?
Electric generators work on the principle of electromagnetic induction. A conductor coil (a copper coil tightly wound onto a metal core) is rotated rapidly between the poles of a horseshoe type magnet. The conductor coil along with its core is known as an armature.
What is difference between DC motor and DC generator?
The most significant difference between DC motor and DC generator lies in the conversion mechanism. DC motor converts electrical energy into mechanical energy whereas DC generator converts mechanical energy into an electrical energy.
Which type of DC generator is used for electroplating process?
Pilot exciter is a DC Shunt generator which feeds the field winding of the main generator. The main exciter is a DC Separately excited generator which is used to excite the rotor winding.
What are the materials used for brushes in DC machines?
Metal Graphite Brushes are generally made from natural graphite and finely divided metal powders. Copper is the most common metallic constituent but silver, tin, lead and other metals are sometimes used. These brushes are often ideal for a wide variety of applications because of their low resistivity.
Which is the application of universal motor?
There are various applications where universal motors are used, such as power drills, wash machines, blowers and kitchen appliances, etc. And they are also used for numerous different purposes where speed control and high qualities of speed are necessary.
What is the function of split rings in a DC generator?
The split ring has the function of reversing the current at that point. When a dc motor shaft comes into contact with a split ring, the split ring reverses the current to maintain the shaft torque in a magnetic field.
What is the difference between commutator and split ring?
What is the difference between a split-ring and a slip-ring commutator? A split-ring makes the current change direction every half-rotation, whereas a slip-ring commutator merely maintains a connection between the moving rotor and the stationary stator.
What is difference between slip ring and commutator?
Physically, a slip ring is a continuous ring, whereas a commutator is segmented. Functionally, slip rings provide a continuous transfer of power, signals, or data. Commutators, on the other hand, are used in DC motors to reverse the polarity of current in the armature windings.
What is the function of split ring?
Role of Split Ring in an Electric Motor Split ring is used for reversing the direction of current in the coil. For the continuous rotation of the coil in the same direction, the current in the coil must be reversed.
Why split ring is called commutator?
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.
How does split ring commutator work?
The split ring commutator reverse the current in the armature every half revolution when the commutator changes contact from one brush to another. This reverse in current causes the forces acting on the coil to be reversed. This helps the coil continue to rotate in a clockwise direction.
What is the reason behind fixing split ring to axle?
The split ring in the electric motor also known as a commutator reverses the direction of current flowing through the coil after every half rotation of the coil. Due to this the coil continues to rotate in the same direction. Was this answer helpful?
What is meant by commutator?
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 the function of split ring commutator and brushes in an electric motor?
1 Answer. Split commutators are rings that allow Direct current to move in the opposite direction to maintain a full rotation. Carbon Brushes are used to conduct the electricity. They are attached to the commutators, and the commutators are attached to the wire loop.
What is electric motor class 10th?
Electric motor is a device that converts electrical energy to mechanical energy. Parts of a Electric Motor. Insulated Copper wire: A rectangular coil of wire ABCD.
What is electric motor with diagram?
Electric motor: A motor is a device which converts electrical energy into mechanical energy. Principle of motor : A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it. A force acts on the coil which rotates it continuously.
What is Fleming’s left hand rule?
Fleming’s Left-Hand Rule is a simple and accurate way to find the direction of force/motion of the conductor in an electric motor when the magnetic field direction and the current direction are known. It was originally developed by John Ambrose Fleming, an English electrical engineer, in the late 19th century.
What is armature class 10th?
Armature: It is a rectangular iron core wrapped by the copper coil through which electricity passes and due to magnetic field it experiences a force and rotates. Brushes: It conducts current between stationary wires and moving parts, most commonly in a rotating shaft.
What is the function of armature?
In the armature, an electromotive force is created by the relative motion of the armature and the field. When the machine or motor is used as a motor, this EMF opposes the armature current, and the armature converts electrical power to mechanical power in the form of torque, and transfers it via the shaft.
What is DC motor Class 10?
A DC motor is an electrical machine that converts electrical energy into mechanical energy. In a DC motor, the input electrical energy is the direct current which is transformed into the mechanical rotation.
Why are carbon brushes used in class 10 motors?
The primary function of carbon brushes is to deliver or collect current from a rotating part of an electric machine. The brushes should maintain a close contact with rotating part (commutator or slip rings) in order to ensure sparkles operation without wearing itself too quickly.