Mini Circuit breakers, also named as the air switch which have a short for arc extinguishing device. It is a switch role, and also is a automatic protection of low-voltage electrical distribution. Its role is equivalent to the combination of switch. Fuse. Thermal Relay and other electrical components. It mainly used for short circuit and overload protection. Generally, According to the poles, mini Circuit breaker can be divided into 1P , 1P+N , 2P, 3P and 4P.
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The transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, the secondary coil, and the iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance transformation, isolation, voltage regulation (magnetic saturation transformer) and so on. That is to combine the application of mechanical technology and electronic technology. With the rapid development and wide application of computer technology, mechatronics technology has achieved unprecedented development, becoming an integrated system technology of computer and information technology, automatic control technology, sensing detection technology, servo transmission technology and mechanical technology. The direction of forward opto-mechatronics technology is developing, and the application range is becoming wider and wider. So what is the difference between a transformer and a motor?
First, similar:
The similarities between asynchronous motors and transformers are mainly reflected in the electromagnetic relationship. They are all "unilateral excitation" electrical equipment, that is, one side (the primary winding of the transformer, the stator winding of the asynchronous motor) is connected to the power supply, and the other side (the second of the transformer) The electromotive force and current in the secondary winding, the rotor winding of the asynchronous motor are all generated by electromagnetic induction. When the power supply voltage is constant, the maximum value of the main magnetic flux is also approximately the hate value, and has no relationship with the size of the load.
It is because of their similar working principle that the equilibrium equations in their circuits and the magnetomotive force balance equations in the magnetic circuit are similar. Or, their electromagnetic relationship is basically the same. As the load increases, the secondary (or rotor) current increases, and the primary (or stator) current also increases.
Second, the difference:
The asynchronous motor and the transformer have a qualitative difference, and their main differences are as follows.
(1) The transformer is a stationary electrical device whose main magnetic field is a pulsating magnetic field. • The electromotive force and current in the primary and secondary windings have the same frequency. The asynchronous motor is a rotating electrical device whose main magnetic field is a rotating magnetic field. When the rotor rotates, the electromotive force and current iV in the stator and rotor windings have different frequencies.
(2) Only the test can be transmitted in the transformer, and the primary side electric energy is transmitted to the secondary side through the main magnetic field. In addition to the world's transmission of asynchronous motors, there is also the conversion of energy M. After the electric energy in the stator windings is transmitted to the rotor windings through the main magnetic field, a considerable part is converted into mechanical energy, which is output from the rotor shaft to the machinery. Negative.
(3) Because there is an air gap in the asynchronous motor, the no-load current is much larger than the transformer. In the high-power motor, the no-load current accounts for 20%~30% of the current; in the low-power motor , up to 35% ~ 50%. Therefore, the no-load loss of the stepping motor is larger than that of the transformer.
(4) Asynchronous motor is a low power factor device. From the perspective of energy, the air current used for the vertical magnetic field is relatively large, and there is an air gap between the stator and the rotor. Under the same conditions of the world, the leakage flux in the asynchronous motor is much larger than that of the transformer. That is, its reactance is larger. This shows that in order to establish a certain magnetic field, the #step motor flute requires a large reactive power. When the power supply voltage is constant, the maximum value of the main magnetic flux of the motor is basically unchanged, indicating that the energy (reactive power) required to establish the magnetic field is substantially unchanged. When the load of the motor is very small, the active power of the motor is very small, and the reactive power accounts for a large proportion, so the power factor is very low (the power factor at no load does not exceed 0.2>. With the increase of the load, the reactive power The proportion of power is gradually reduced, so the power factor of the asynchronous motor is gradually increased. It reaches the maximum when it is close to the rated load (generally not more than 0.9). When the load is larger, the rotor reactance increases due to the increase of the slip. More, so the power factor drops again.