The rotating speed of an electric motor depends on two factors: its physical construction, and the frequency (Hz) of the voltage supply.
What causes the rotation in an electric motor?
Magnetic fields cause motors to rotate. … A coil of wire carrying a current in a magnetic field tends to rotate. This is the basis of an electric motor. The force on a conductor in a magnetic field causes the rotation of the coil in an electric motor.
What factors affect the motor effect?
The size of the force can be increased by:
Increasing the magnetic field strength; Increasing the length of the wire in the field; Increasing the current in the wire.
What factors affect the motion of the coil for the motor?
What four factors affect the magnitude of the induced emf in a…
- The induced e.m.f. is proportional to the number of turns in a coil.
- The speed at which the conductor moves through the magnetic field.
- The length of the conductor.
- The rate at which the conductor cuts the magnetic lines of force.
What makes a motor spin faster?
How can I make the motor spin faster or slower? ANSWER: In order to make the motor spin faster or slower you must increase or decrease the strength of the magnetic field. This is done by either changing the amount of current running through the motor or varying the distance of the permanent magnets from the motor.
How does a motor rotate?
The basic idea of an electric motor is really simple: you put electricity into it at one end and an axle (metal rod) rotates at the other end giving you the power to drive a machine of some kind. … When an electric current starts to creep along a wire, it creates a magnetic field all around it.
What is the motor effect simple?
A wire carrying a current creates a magnetic field. This can interact with another magnetic field, causing a force that pushes the wire at right angles. This is called the motor effect.
What are the factors that contribute to the strength of an electric motor?
Motor performance depends on three elements such as voltage across terminals, resistance across terminals, and magnetic force.
What are the two factors that increase the force on an electric wire in a motor?
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 are the factors affecting size of rotating machines?
Explanation: There are 2 factors that affect the size of rotating machines. They are speed of the machines and the output coefficient of the machines.
Why does the coil rotate continuously?
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.
What force makes the coil 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.
How can you increase the speed of an electric motor?
The speed of the rotation of the electric motor can be increased by changing the resistance of the circuit, by decreasing the resistance of the electric motor, there is the increase of the current then the current strength will increase.
How does voltage affect motor speed?
Back to the original question: how does voltage affect speed? From the analysis above, we can see that when the load (torque) on the motor is constant, speed is directly proportional to supply voltage. And, when the voltage remains constant, an increase in the load (torque) on the motor results in a decrease in speed.
How does frequency affect motor speed?
A frequency higher than the rated frequency usually improves the power factor but decreases locked-rotor torque and increases the speed and friction and windage loss. At a frequency lower than the rated frequency, the speed is decreased, locked-rotor torque is increased, and power factor is decreased.