How does the motor select ac contactor
How is the wiring of an open, overheated relay, an open, overheating relay machine? The circuit breaker, the thermal relay? How to according to the power of motor, considering the voltage rating of the motor, electrical wiring, circuit breaker, thermal relay Three-phase motor, two hundred and twenty mw three point five amps. It is usually three hundred eight motors, one kilowatt and two ampere. Low pressure 66th motor, kilowatt hour two amperes. High voltage 3 kilovolt motor, 4 kilowatt ampere. High pressure 6 kilovolt motor, 8 kilowatt per ampere. A three-phase motor, in addition to the know the rated voltage, also must know its rated power and rated current, such as: a three-phase asynchronous motor, 7.5 KW, 4 pole (commonly used generally there are 2, 4, 6 class, series is not the same, the difference was the rated current), the rated circuit is about 15 a
Motor is a device that converts electricity into mechanical energy. It USES the electric coil (which is the stator winding) to generate a rotating magnetic field and is applied to the rotor (such as the cage of a cage) to create the magnetoelectric rotation torque. Motor by using the power divided into dc motor and ac motor, electric power system in most of the motor is ac motor, can be synchronous motor or induction motor (motor stator magnetic speed and rotor rotating speed is not synchronized rate). The motor is composed mainly of stator and rotor, which is related to the direction of force motion in the magnetic field and the direction of the current and the magnetic flux line. The operating principle of an electric motor is the effect of the magnetic field on the current, making the motor spin.
The communication contactor consists mainly of four parts: (1) electromagnetic system, including attracting coils, moving iron core and static iron core; (2) the contact system, including three main contact heads and one to two sets of regular open, often closed auxiliary contacts, is connected to the moving iron core. (3) an arc extinguishing device, which has a general capacity of communication contacts with an arc extinguishing device, so as to cut off the arc of the arc rapidly, avoiding the burning main contact; (4) insulation case and accessories, all kinds of spring, transmission mechanism, short circuit ring, terminal column etc.
Choose motor ac contactor according to the motor power to choose the right size, 1.5-2.5 times, generally the model selection manual, still have to pay attention to the matching auxiliary contact, don't you then buy back auxiliary contact is not enough to use.
