EXPLANATION: When electricity is passed through a wire coil (as you are doing when you connect the coil to the battery), you create an electromagnetic field , which pushes the coil away from the magnet. ... When the circuit is complete again, the magnetic field once again repels the coil, so it keeps spinning.
Why does the coil in a motor spin?
A coil of wire becomes an electromagnet when current passes through it. The electromagnet interacts with a permanent magnet , causing the coil to spin.
Why does a rotor spin in a simple motor?
The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis .
How does a motor coil rotate?
When a current passes through the armature coil , forces act on the coil and result in rotation. Brushes and a commutator are used to reverse the current through the coil every half rotation and so keep the coil rotating. The speed of rotation can be changed by changing the size of the current to the armature coil.
What keeps the coil of wire spinning?
When electricity is passed through a wire coil (as you are doing when you connect the coil to the battery), you create an electromagnetic field, which pushes the coil away from the magnet. ... When the circuit is complete again, the magnetic field once again repels the coil, so it keeps spinning.
What will happen if we increase the number of turns of a coil of a motor?
Increasing the number of turns of wire in the coil – By increasing the amount of individual conductors cutting through the magnetic field, the amount of induced emf produced will be the sum of all the individual loops of the coil , so if there are 20 turns in the coil there will be 20 times more induced emf than in one ...
How can a motor spin fast?
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. Either the motor will stop, or it will run faster.
How do you make an electric motor more powerful?
We can increase the turning force (or torque) that the motor can create in three ways: either we can have a more powerful permanent magnet, or we can increase the electric current flowing through the wire, or we can make the coil so it has many “turns” (loops) of very thin wire instead of one “turn” of thick wire.
How can I make my coil spin slower?
- 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 causes the coil to continue spinning when current is not flowing?
When the switch is closed, the current starts to flow and the coil becomes an electromagnet. ... If the current in the coil were constant, the coil would stop in this position. However, to keep it spinning, the commutator breaks contact in this position. So the current stops for an instant.
What are the two main parts of a DC motor?
DC motors include two key components: a stator and an armature . The stator is the stationary part of a motor, while the armature rotates. In a DC motor, the stator provides a rotating magnetic field that drives the armature to rotate.
How do you make a dc motor step by step?
- Step 1: Build your coil base. ...
- Step 2: Wrap the coil around the coil base. ...
- Step 3: Test the electrical connection of the wire. ...
- Step 4: Improve the electrical connections of the coil base. ...
- Step 5: Check the connections. ...
- Step 6: Make the commutator. ...
- Step 7: Construct the stator (the base)
What happens if we increase the number of turns from 1 to 5?
Answer: Higher the number of turns, higher the length and thus the amount of current carrying coil material in use is higher and thus higher the magnetic field due to increased amount of current flowing through the solenoid as a result of the increased number of turns.
How can we induce current in a coil?
- If a coil is moved rapidly between the two poles of a horseshoe magnet, then an electric current is induced in the coil.
- If a magnet is moved relative to a coil, an electric current is induced.
- By keeping it stationary and rotating a magnet inside it, the current in the coil can be induced.
How do you increase current in a coil?
- Taking the conductor in the form of a coil of many turns of insulated wire.
- Increasing the strength of the magnetic field used.
- Increasing the rate of change of magnetic flux associated with the coil.
How do I lower the RPM on my electric motor?
- Use gears to change ratio of speed, which is what you're going to do. ...
- Use a stepper motor, which are commonly used for high-torque, low RPM applications.
- Find some sort of PWM control circuit to slow it down, although you probably won't be able to get it down to 5-10RPM.
