The armature is mounted on bearings and is free to rotate. It is mounted in the magnetic field produced by permanent magnets or current passing through coils of wire, which are called the field coils. When a current passes through the armature coil, forces act on the coil and result in rotation.
What makes the armature in an electric motor rotate?
A changing magnetic field can induce an electric current. What makes the armature in an electric motor rotate? The magnet of the motor exerts a force (up on one side, down on the other side) on the armature, which causes the armature to rotate. … An electromagnet has a stronger magnetic field than the solenoid has.
Why does the coil rotate continuously?
the coil of wire has an electrical current running through it because it is connected to the cell. this generates a magnetic field around the wire. the current is turned on and off at the correct time so the magnetic field of the wire interacts with that of the two magnets. this makes the coil rotate.
How does a motor rotate?
Large AC motors (used in things like factory machines) work in a slightly different way: they pass alternating current through opposing pairs of magnets to create a rotating magnetic field, which “induces” (creates) a magnetic field in the motor’s rotor, causing it to spin around.
Why do DC motors rotate?
These rotating magnetic fields interact with the magnetic fields of the magnets (permanent or electromagnets) in the stationary part of the motor (stator) to create a torque on the armature which causes it to rotate. … The speed of a DC motor can be controlled by changing the voltage applied to the armature.
What does an armature do in a motor?
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.
Does an electric motor transforms matter?
When a wire with a current is placed in a magnetic field, electrical energy is transformed into mechanical energy. … An electric motor transforms potential energy into mechanical energy.
How can we increase the power of DC motor?
The power of the DC motor increases by increasing the torque developed by the shaft/rotor which in turn depends on the current in direct proportion.
How do you increase the speed of rotation of the coil?
The speed of rotation of the coil can be increased by:
- increasing the size of the current;
- using a stronger magnet;
- increasing the number of turns of wire in the coil;
- reducing friction between the coil and the axel it rotates on.
What device is used to ensure continuous rotation of the coil in the motor?
What are the 6 parts of an electric motor?
These six components include:
- 1) The Rotor. The rotor is the moving part of your electric motor. …
- 3) The Bearings. The rotor in your electric motor is supported by bearings, which allow it to turn on its axis. …
- 4) The Windings. …
- 5) The Air Gap. …
- 6) The Commutator. …
- What Do All of These Components Have in Common?
How long can an electric motor run continuously?
You should anticipate, given proper attendance, that the motor can run continuously for the life of its brushes, which should be in the range of six months to a year. Presuming that the motor is too small to have its brushes changed by a trained electrician while running.
Can an electric motor generate electricity?
Converting energy from one form to another is the key to understanding the differences between electric motors and generators. An electric motor converts electricity into mechanical energy, providing a power source for machinery. A generator does the opposite of this, converting mechanical energy into electricity.
Can DC motors spin both ways?
Simply put, DC motors can turn in either direction (clockwise or counter-clockwise) and can be easily controlled by inverting the polarity of the applied voltage. If a motor is already in motion, the applied voltage can be inverted and the motor will decelerate quickly, eventually stopping. …
How do you reverse the rotation of a DC motor?
DC motors, like AC motors, can be configured to turn in either direction. Their direction can be easily controlled by inverting the polarity of the applied armature voltage by reversing the armature leads.