Views: 0 Author: Site Editor Publish Time: 2022-05-03 Origin: Site
After the motor coil is energized, it is rotated by the force of the magnetic field, and its coil cuts the magnetic line of induction. According to the phenomenon of electromagnetic induction, it does not produce an induced current. This current, together with the current passing through it, does not increase the current passing through the coil. The coil is rotated by the force of the magnetic field again. Why is the direction of the induced current generated by the coil being rotated by the current and cutting the magnetic induction line in the opposite direction? Can electric motors generate electricity?
This passage is going to talk about the followings of ac motor:
(1) Principle of Ac motor
(2) Generator is not motor
(3) How do electric motors generate electricity?
According to the left-hand rule and the right-hand rule, the current directions of the coils are indeed opposite.
However, the motor will not stop rotating because of this, it will keep rotating and output power to the outside. The reason is that the current that causes the coil of the motor to be subjected to ampere force is generated by the applied electromotive force. When the applied electromotive force forces the coil current to flow in one direction, the electromotive force generated by electromagnetic induction at this time has a tendency to weaken the coil current. But it is never possible to overcome the additional electromotive force, otherwise an ideal state without any energy loss will appear. The final effect is that the current in the coil always flows continuously in the direction of the applied electromotive force.
Electric motors equipped with permanent magnets can generate electricity, the principle is electromagnetic induction. However, the alternator made by using the "squirrel cage principle" generally cannot be directly used as a generator because it lacks the necessary circuitry to make the coil a controllable electromagnet.
An electric motor is a device that converts electrical energy into mechanical energy. It uses energized coils (that is, stator windings) to generate a rotating magnetic field and act on the rotor squirrel-cage closed aluminum frame to form magneto-electric power rotating torque. Motors are divided into DC motors and Ac motors according to different power sources. Most of the motors in the power system are Ac motors, which can be synchronous motors or asynchronous motors (motor stator magnetic field speed and rotor rotation speed do not maintain synchronous speed). The motor is mainly composed of a stator and a rotor. The direction of the force movement of the energized wire in the magnetic field is related to the direction of the current and the direction of the magnetic line of induction (magnetic field direction). The working principle of the motor is the action of the magnetic field on the force of the current to make the motor rotate.
Ac motors rely on electricity to provide a magnetic field for work, but they must first have a magnetic field to generate electricity.
Specific to different motor power generation methods have their own characteristics. For permanent magnet motors, because they have a native magnetic field (permanent magnets have a magnetic field), rotating the motor in any direction without energization can generate electromotive force in the windings to generate electricity. Similarly, AC synchronous motors are exciting When the winding is energized, it is basically the same when the working winding is not energized. When the AC asynchronous motor is not energized, because there is no magnetic field, the rotating motor will not generate electricity. When it is energized, in the four quadrants of the motor operation, the two external mechanical energy can generate electricity when the output power of the motor is greater than the output power of the motor. The same applies when the magneto is energized. The situation of DC motor is more complicated, so I won't describe it. Therefore, it is not that the motor can generate electricity by reversing.