A coil of wire carrying a current in a magnetic field experiences a force that tends to make it rotate. This effect can be used to make an electric motor.
Why does the coil spin in an electric motor?
Inside an electric motor, permanent magnets are set onto a ring surrounding a coil of wire. When the appliance’s switch is flicked on, electrons flow through the wire, turning it into an electromagnet. The attractive and repulsive forces of the permanent magnets around it make the electromagnet spin.
How do you reverse the direction of forces on the coil in an electric motor?
(i) Give two ways of reversing the direction of the forces on the coil in the electric motor.
Any two from:
- increase the strength of the magnet(s) or (magnetic) field.
- increase the current (allow ‘increase the voltage/p.d.’ or allow add cells/batteries.
- reduce the gap (between coil/armature and poles/magnets)
How does a motor coil rotate?
A simple DC motor has a coil of wire that can rotate in a magnetic field. The current in the coil is supplied via two brushes that make moving contact with a split ring. The coil lies in a steady magnetic field. The forces exerted on the current-carrying wires create a torque on the coil.
How does an electric motor work simple explanation?
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor’s shaft.
How can you make a DC motor more powerful?
How to improve torque and RPM of a DC motor?
- Case 1: Increase/Decrease strength of permanent magnets. What would happen to torque and RPM? …
- Case 2: Increase/Decrease size of magnet wires. What would happen to torque, power consumption and RPM? …
- Case 3: Increase/Decrease the size of armature. …
- Case 4: Increase/Decrease the number of turns (coil).
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.
What device is used to ensure continuous rotation of the coil in the motor?
Which change would make the coil turn in the opposite direction?
If we change the direction of the current so that the wire on the right is negative and that on the left positive) the motor will turn in the opposite direction (CLOCKWISE in this case).
Can you make the coil spin in both directions?
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. …
What makes a motor spin faster?
One easy way to make the motor run faster is to add another magnet. Hold a magnet over the top of the motor while it is running. As you move the magnet closer to the spinning coil, one of two things will happen. … There is another way to speed up the motor.
Why does a motor move?
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.
How do you increase the effect of a coil?
To increase the turning effect of the coil in the motor:
- Insert a soft Iron core or cylinder into coil – to concentrate the magnetic field lines.
- Increase the number of turns in the coil.
- Increase the current in the coil.
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.
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 does a DC electric motor work?
Electric motors turn electricity into motion by exploiting electromagnetic induction. The motor features a permanent horseshoe magnet (called the stator because it’s fixed in place) and an turning coil of wire called an armature (or rotor, because it rotates). …