What is the wire coil of an electric motor?
The coil is made of copper wire – because it is such an excellent conductor (see conducting properties). It is wound onto an armature. The coil becomes an electromagnet when a current flows through it. The armature supports the coil and can help make the electromagnet stronger.
Why does the wire loop in an electric motor spin?
The permanent magnet attracts its opposite pole on the coil and repels its like pole, causing the coil to spin. Another way to describe the operation of the motor is to say that the permanent magnets exert forces on the electrical currents flowing through the loop of wire.
What happens when you spin the coil in the other direction?
When the coil is vertical, it moves parallel to the magnetic field, producing no force. The attractive and repulsive forces of the permanent magnets around it make the electromagnet spin. When you change the direction of current, the curl magnetic field will just reverse the direction.
Does the motor rotate continuously when there is current?
Because the current flows in opposite directions in the wires, Fleming’s Left-Hand Rule tells us the two wires will move in opposite directions. If the coil of wire could carry on moving like this, it would rotate continuously—and we’d be well on the way to making an electric motor.
Does the coil continue to rotate when the current is off?
When you give the coil a spin, since one side of the wire is insulated, you break the circuit briefly, so the coil continues to rotate using its momentum. When the circuit is complete again, the magnetic field once again repels the coil, so it keeps spinning. The motor can continue to spin until the battery is dead!
What will happen to the rotation of the coil of the electric motor?
This means that the current in the left hand part of the coil still causes a downward force, and current in the right hand part of the coil still causes an upward force. This means that the motor effect forces continue to cause anti-clockwise rotation of the coil.
What will happens to the coil when a magnet is placed near your improvise motor?
When you push the magnet through the middle of the coil, an electric current is produced in the wire. The current flows in one direction as the magnet is pushed in, and in the other direction as the magnet is removed. In other words, an alternating current is produced.
Why does the coil rotate continuously when there is a current in the coil?
The coil of wire is mounted in the gap between the two magnets. The split rings make electrical contact with the coil and reverse the current every half turn. When an electric current flows through the coil, a force is exerted on the coil, causing it to spin. this generates a magnetic field around the wire.
What device is used to ensure continuous rotation of the coil in the motor?
The Commutator The answer is to use a commutator. This device prevents the wires from twisting. More importantly it actually allows the coil to keep rotating in one direction! The one shown is a split-ring commutator.
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. Strictly speaking, the motors can actually create a force in either direction.
How do you change the direction of the coil in a motor?
The direction of rotation of the coil can be reversed by:
- reversing the direction of the current OR.
- reversing the direction of the magnetic field (changing over the north and south poles).
How do you reverse the direction of forces on the coil in an electric motor?
The direction of the current must be reversed every half turn, otherwise the coil comes to a halt again. This is achieved using a conducting ring split in two, called a split ring or commutator. A coil of wire is used with lots of turns to increase the effect of the magnetic field.
What makes a DC motor spin faster?
A faster motor. One easy way to make the motor run faster is to add another magnet. 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.
What direction does a motor turn?
Engine, or crankshaft rotation, is the direction the engine spins: either clockwise or counterclockwise. Most vehicles have the standard rotation, counterclockwise.
Do motors run clockwise?
Electric motors are designed either for clockwise rotation, or counter-clockwise, or both. This is very simple. The IEC standard says that the direction of rotation is always viewed from the driven end side, where the load is. The item important for direction of rotation are mainly the cooling fans.