What type of a motor has a commutator bar?
2.3 AC commutator motors The most commonly used variable-speed AC commutator motor has been the stator-fed type, in which both the stator and armature are insulated windings, the armature winding being brought out to a commutator.
What kind of motors use commutation?
There are two types of commonly used DC motors: Brushed motors, and brushless motors (or BLDC motors). As their names imply, DC brushed motors have brushes, which are used to commutate the motor to cause it to spin. Brushless motors replace the mechanical commutation function with electronic control.
What is the role of a commutator in a simple electric motor?
The function of the commutator is to reverse the current in the core of the motor. In the vertical position, the commutator disconnects the circuit reversing the flow of current and prevents the motor from the halt.
What is a commutator bar?
A commutator consists of a set of contact bars fixed to the rotating shaft of a machine, and connected to the armature windings. As the shaft rotates, the commutator reverses the flow of current in a winding.
How simple motors are different from commercial motors?
A simple 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 a coil which rotates it continuously while in commercial motors, the coil is bound on a soft iron core which becomes magnetized and increase the length of the magnetic field …
What is a commutator in an electric motor?
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. In a motor the commutator applies electric current to the windings.
What is the function of commutator in electric motor Class 10?
Answer: The function of commutator or slip ring is to change the direction of current through the coil after every half rotation.
Do AC motors have commutators?
Alternating current motors, which do not use commutators, are much more efficient. There is a limit to the maximum current density and voltage which can be switched with a commutator. Very large direct current machines, say, more than several megawatts rating, cannot be built with commutators.
What type of single phase motor uses a commutator?
A specially designed series-commutator motor may be operated from a single-phase alternating voltage supply. When the supply current reverses, both the magnetic field and the armature current are reversed. Thus, the torque remains in the same direction.
What is the principle of simple motor?
The principle of an electric motor is based on the current-carrying conductor which produces magnetic field around it. A current-carrying conductor is placed perpendicular to the magnetic field so that it experiences a force.
How are the contact bars of a commutator connected?
A commutator consists of a set of contact bars fixed to the rotating shaft of a machine, and connected to the armature windings. As the shaft rotates, the commutator reverses the flow of current in a winding.
What is a commutator in an electric generator?
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.
How is an armature connected to a commutator?
The windings (coils of wire) on the armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings.
What are the parts of a simple motor?
A simple motor has the following parts: A power supply – mostly DC for a simple motor. Field Magnet – could be a permanent magnet or an electromagnet. An Armature or rotor. Commutator. Brushes. Axle. Power Source: A simple motor usually has a DC power source. It supplies power to the motor armature or field coils.