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Asynchronous motor

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1.AC asynchronous motor
AC asynchronous motor is AC voltage operation of motor leading and widely used in electric fans, refrigerators, washing machines, air conditioning, hair dryer, vacuum cleaners, lampblack machine, dishwasher, electric sewing machines, food processing machines and other household appliances and various electric tools, minicomputers, electrical equipment.
AC asynchronous motor for induction motor and AC motor commutator. The induction motor is divided into single-phase asynchronous motor, AC and DC motor and repulsion motor.
The speed of the motor (rotor speed) is less than the speed of the rotating magnetic field, which is called the asynchronous motor. It is basically the same as the induction motor. S= (ns-n) /ns. S is slip,
Ns for the magnetic field speed, n for the rotor speed.
Basic principle:
One： when the three-phase asynchronous motor is connected with a three-phase AC power supply, three-phase stator winding through the symmetry of the three-phase current of three-phase magnetic motive force (the stator rotating magnetic motive force (MMF) and produce a rotating magnetic field.
2. The rotating magnetic field and the rotor conductor have relative cutting motion. According to the principle of electromagnetic induction, the rotor conductor has the induction electromotive force and the induced current.
3, according to the law of electromagnetic force, carrying the rotor conductor in the magnetic field by the electromagnetic force, the electromagnetic torque, drive the rotor rotation, when the motor shaft with mechanical load, then the output of mechanical energy.
Induction motor is a kind of AC motor, the speed of the load is not constant with the ratio of the frequency of the power grid. Also changes with the size of the load. The greater the load torque, the lower the rotor speed. Asynchronous motor including induction motor and double fed asynchronous motor and AC motor commutator. Induction motor is the most widely used in the case of misunderstanding or confusion, generally can be referred to as induction motor.
The stator winding of the common asynchronous motor is connected with the AC power grid, and the rotor winding is not connected with other power supply. Therefore, the structure has the advantages of simple structure, convenient manufacture, use and maintenance, reliable operation, low quality, low cost and the like. The induction motor has higher operating efficiency and better working characteristics, and it can meet the constant speed operation from no load to full load range, which can satisfy the transmission requirements of most industrial and agricultural production machines. Asynchronous motors are also easy to send to generate various types of protection, in order to adapt to the needs of different environmental conditions. When the induction motor is running, it must absorb reactive power from the grid, so that the power factor of the electric network becomes worse. Therefore, to drive the ball mill, compressor and other large power, low speed of mechanical equipment, often using synchronous motor. Because asynchronous motor rotation speed and the rotating speed of rotating magnetic field with certain slip relationship, its speed and poor performance (AC commutator motor except). On the requirements of a wide and smooth speed range of transport machinery, rolling mill, large machine, printing and dyeing and paper machinery, the use of DC motor is more economical and convenient. However, with the development of high power electronic devices and AC speed regulating system, the speed control performance and economic performance of asynchronous motor which is suitable for wide speed regulation has been compared with that of DC motor.

Two: single phase asynchronous motor
Single phase asynchronous motor by stator,
Single phase induction motor
Single phase induction motor
Rotor, bearing, casing, end cap and so on.
Composition of core stator consists of frame and belt winding. The iron core is formed by the pressing of the silicon steel sheet, and the main winding (also known as the running winding) and the auxiliary winding (also known as the starting winding and the auxiliary winding) are embedded with 90 sets of main winding (also known as the running winding) and the auxiliary winding (also called starting winding). The main winding is connected with an AC power supply, and the auxiliary winding is connected with a centrifugal switch S or a starting capacitor and a running capacitor, and then the power supply is connected with the power supply.
Rotor cage type cast aluminium rotor, it is core lamination with aluminum cast into the iron core groove, and together they cast end rings, the rotor short-circuit squirrel cage type.
Single phase induction motor is divided into single-phase resistance starting asynchronous motor, single-phase capacitor starting asynchronous motor, single-phase capacitor running asynchronous motor and single-phase double value capacitor induction motor.

Three: three phase asynchronous motor
The structure of the three-phase asynchronous motor is similar to that of single phase induction motor, and the stator iron core slot is embedded with three-phase windings (single chain, single layer concentric and single layer cross three structure). Stator winding is connected with a three-phase AC power supply, the winding current to produce a rotating magnetic field. In the rotor conductors generate induced current rotor in rotating magnetic field of the induced current and gas gap interaction and electromagnetic counter (asynchronous counter), the motor is rotated.

Four： shaded pole type motor
Shaded pole type motor is one of the simplest type of AC motor,
AC synchronous motor
AC synchronous motor
Usually the cage cast aluminum rotor chute. According to the different stator structure, it is divided into salient pole type shaded pole motor.
The stator core of the salient pole type shaded pole motor is square, rectangular or circular magnetic field frame, and the magnetic pole is convex, and each magnetic pole has 1 or more short circuit copper rings which have auxiliary function. The concentrated winding on the salient pole pole is used as the main winding.
Salient pole type cover the motor stator iron core and common single-phase motor iron core the same, the stator winding adopts distributed winding, primary winding distribution in stator slot cover pole winding without short circuit ring copper, but with thicker paint covered wire is wound into a distributed winding (Series self short circuit block is arranged in the stator slots (about two-thirds of the total number of slots), group of auxiliary role. The main winding and the shaded pole winding are in a certain angle in space.
When the cover pole motor of main winding is energized, shaded pole winding will induction current is generated, the quilt of stator magnetic pole pole winding covering part of the flux and did not cover part to rotate in direction of the quilt cover.

Five：single phase series motor
Single-phase series excitation motor stator by the convex pole core and the excitation winding, rotor composed of a hidden core armature winding and commutator shaft and other composition. Between the excitation winding and the armature winding circuit through brush and commutator formation.
Single phase series motor is an AC and DC motor. It can work with AC power and DC power supply.