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Electric motor rotation and current direction

Jun 01, 2019

In the process of rotating the electric motor, the main principle is based on the left-hand rule of John Ambrose Fleming. When a wire is placed in the magnetic field, if the wire is connected to the current, the wire will cut the magnetic field line. Move the wire. The current enters the coil to generate a magnetic field, and the magnetic effect of the current is used to cause the electromagnet to continuously rotate in the fixed magnet to convert the electrical energy into mechanical energy.


The permanent magnet of the electric motor or the power generated by the interaction of the magnetic fields generated by another set of coils. When using the DC motor, the principle of the DC motor is that the stator does not move, and the direction of the force generated by the rotor according to the interaction during the operation is performed. motion. The AC motor is a stator winding coil that is connected to an alternating current to generate a rotating magnetic field. The rotating magnetic field attracts the rotor together as a rotary motion. The basic structure of the DC motor includes an "armature", a "field magnet", a "collector ring", and a "brush."


The electric motor can wind a multi-turn coil around a soft iron core that rotates around the axis. Field magnet: A strong permanent magnet or electromagnet that generates a magnetic field. Collector ring: The coil is connected at both ends to two semi-circular collector rings, which are rotated by the coil to change the current direction of the diverter. The direction of the current on the coil changes once every half turn (180 degrees). Brush: Usually made of carbon, the collector ring contacts the fixed position of the brush for connection to the power supply.