Publish Time: 2023-09-08 Origin: Site
electric motor is a general term for electric electric motor and generators. Usually divided into two categories: DC electric motor and AC electric motor. AC electric motor are divided into two categories: asynchronous electric motor and synchronous electric motor.
Here is the list
What is the purpose of the stator in a electric motor?
What is the purpose of the convex pole rotor in a electric motor?
What is the purpose of the commutator in a electric motor?
The stator surrounds the rotor and is usually equipped with magnetic field magnets, which are either electromagnets consisting of wire windings wound around a ferromagnetic core, or permanent magnets. These produce a magnetic field that passes through the rotor armature and exerts a force on the windings. The stator core consists of a number of thin metal sheets insulated from each other, called laminations. The laminations are used to reduce the energy loss that can result when solid cores are used. Resin-encapsulated electric motors used in washing machines and air conditioners use the damping properties of resin (plastic) to reduce noise and vibration. These electric motors encapsulate the stator in plastic.
An armature consists of wound wires on a ferromagnetic core. The current through the wire causes the magnetic field from the magnetic field magnet to exert a force (Lorentz force) on it, which turns the rotor and thus provides mechanical output. The winding is the wire laid in the coil, usually wrapped around a laminated soft iron ferromagnetic core to form the magnetic poles when energized.
electric motors are available in convex and non-convex configurations. In a convex-pole electric motor, the ferromagnetic cores on the rotor and stator have protrusions called poles facing each other, with a wire wrapped around each pole below the pole face, which becomes the north or south pole of the magnetic field as current flows through the wire. In a non-convex pole (or distributed field or circular rotor) electric motor, the ferromagnetic core is a smooth cylinder with windings evenly distributed in slots around the circumference of the circle. The supply of AC current in the windings produces continuously rotating poles in the core. [53] A shaded-pole electric motor has a winding around a portion of the magnetic pole that delays the phase of the magnetic field at that pole.
Commutator from a general purpose electric motor for vacuum cleaners. Parts: (A) commutator, (B) brush
The commutator is a rotating electrical switch that supplies current to the rotor. It periodically reverses the flow of current in the rotor winding as the shaft rotates. It consists of a cylinder consisting of a number of metal contact segments on the armature. Two or more electrical contacts called "brushes" are made of a soft conductive material such as carbon and are pressed onto the commutator. The brushes are in sliding contact with successive commutator plates as they rotate, providing current to the rotor. The windings on the rotor are connected to the commutator blades. The commutator periodically reverses the direction of the current in the rotor windings every half turn (180°), so that the torque applied to the rotor is always in the same direction. [54] Without this current reversal, the direction of torque on each rotor winding would be reversed every half turn, so the rotor would stop. Commutators are inefficient and commutation electric motors have mostly been replaced by brushless DC electric motors, permanent magnet electric motors and induction electric motors.
Hangzhou New Hengli Electric Machine MFG. Co., Ltd. (Originally Hangzhou Hengli Electric Machine MFG. Co., Ltd.) was founded in 1954.