Electric tools various electric motors working principle
Release time：2018-3-13 14:57:46 Number of clicks：454
Electric tools are now widely used in industry. Motors are also called motors, turning electrical energy into mechanical energy machines. The electric motor can be used to produce a large amount of electric energy, which can be used in production. The structure and the generator are basically the same, but the principle is the opposite. The motor is electrically charged to the rotor coils to cause motion, and the generator is the electric current generated by the motion of the rotor in the magnetic field. In order to obtain a strong magnetic field, both motors and generators are appropriate to use electromagnets.
The motor can be divided into dc motor and ac motor due to the different input current.
(1) dc motor - the motor that USES dc current to turn is called dc motor. Because the magnetic field circuit is different from the armature circuit, it can be divided into series motor, shunt motor and compound motor.
(2) the induction motor, ac motor, ac motor its powerful induced current (eddy current) generated by rotating magnetic field, the copper bar on the rotor continuous cutting of magnetic field lines, according to lenz's law, the induced current is against the rotor magnetic field and the effect of relative motion, so the rotor is rotating with the magnetic field. However, the rotation speed of the rotor is not as high as that of the magnetic field, otherwise the magnetic force line will not be cut by the copper rod.
The motor that USES alternating current to turn is called ac motor. There are many kinds, mainly:
- make a, rectifier motor series dc generator, for ac motor, namely into this kind of motor, because of an alternating current in the magnetic field and the armature circuit, shift at the same time, so the moment of couple of direction remains the same, this machine is rotating. This type of motor is also known as "general motors" because it can be used for ac and dc. Vacuum cleaners, sewing machines and other household appliances are used in this kind of motor.
B. Induction motor -- a device for rotating the rotor in a rotating magnetic field due to the effect of the eddy current. The rotating magnetic field is not caused by a mechanical method, but by alternating current to the number of electromagnet to make the magnetic pole of the magnetic pole change, and can be seen as a rotating magnetic field. A three-phase induction motor (with three pairs of poles) is usually used. The motion of dc motor is exactly the opposite of the dc generator. In the generator, the induced current is formed by the induced electromotive force, so they are in the same direction. The current in the motor is the direction of the induced electromotive force of the external power supply and the armature current I.
C. Synchronous motor - the armature from one pole to the second pole, and the motor with the same cycle as the current. This motor cannot be operated by itself, and it must be connected by another motor or special auxiliary winding to reach the appropriate frequency. If the load is changed and the speed is changed, the rotation speed is not in accordance with the ac frequency, and the foot is out of step and tends to stop or cause damage. Because of the limitation, the application is not wide.
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