Transformer (Transformer) is a device that uses the principle of electromagnetic induction to change the AC voltage, the main components are the primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), etc. It can be divided into power transformers and special transformers (electric furnace transformer, rectifier transformer, power frequency test transformer, voltage regulator, mining transformer, audio transformer, intermediate frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer) , Reactors, transformers, etc.). Circuit symbols often use T as the beginning of the number. Example: T01, T201, etc.
Output reactor: when the length of the cable output from the inverter to the motor is greater than the specified value of the product, an output reactor should be added to compensate for the impact of the charge and discharge of the coupled electrical capacitance when the electrical cable is running, to avoid the inverter flow. Output dv / dt reactor: In order to limit the rise rate of the output voltage of the inverter to ensure the insulation of the motor is normal. Sinusoidal wave filter: Make the output voltage and current of the inverter approximate to a sine wave, reduce the harmonic domain coefficient of the motor and the insulation pressure of the motor. These options should be installed on the output side of the inverter.
The following is the product model and its introduction：
3RT2015-1BB41。4AM2342-4TN00-0EA1, 4AM2342-4TT10-0FA0。4AM2342-4TN00-0EB0。4AM2342-4TN00-0EA0。4AM2342-5AJ10-0FB0。4AM2342-5AT10-0FB0。4AM2342-5AT10-0FA0。4AM2342-5AN00-0EB0。4AM2342-5AN00-0EA0。4AM2642-4TT10-0FA0。4AM2642-4TN00-0EB0。4AM2642-4TN00-0EA0。4AM2642-5AJ10-0FB0。4AM2642-5AT10-0FA0。4AM2642-5AN00-0EB0。4AM2642-5AN00-0EA0。4AM3242-4TT10-0FD0。4AM3242-4TN00-0ED0。4AM3242-5AN00-0ED0。4AM3242-8JN00-0ED0。4AM3242-8DD40-0FD0。4AM3242-4TN00-0EC0。4AM3242-4TV00-0EC0。4AM3242-5AT10-0FC0。4AM3242-4TJ10-0FA0。4AM3242-4TT10-0FA0。4AM3242-4TT10-0FA1。4AM3242-4TN00-0EA0。4AM3242-4TV00-0EA0。4AM3242-5AJ10-0FA0。4AM3242-5AT10-0FA1。4AM3242-5AT10-0FA0。4AM3242-5AN00-0EA1。4AM3242-5AN00-0EA0。4AM3242-5AV00-0EA0。4AM3242-8JN00-0EA0。4AM3242-8JD40-0FA0。4AM3242-5CJ10-0FA0。4AM3242-5CT10-0FA0。4AM3242-5CN00-0EA0。4AM3242-5FT10-0FA0。4AM3242-8DN00-0EA0。4AM3242-8DD40-0FA0。4AM3242-8EN00-0EA0。4AM3242-8ED40-0FA0。4AM3242-5LT10-0FA0。4AM3242-5MT10-0FA0。4AM3242-5AT10-0FA2。4AM3442-4TN00-0ED0。4AM3442-5AT10-0FD0。4AM3442-8DD40-0FD0。4AM3442-4TN00-0EC0。4AM3442-5AT10-0FC0。4AM3442-5AN00-0EC0。4AM3442-4TJ10-0FA0。4AM3442-4TT10-0FA0。4AM3442-4TN00-0EA1。4AM3442-4TN00-0EA0。4AM3442-4TV00-0EA0。4AM3442-5AJ10-0FA0。4AM3442-5AT10-0FA1。4AM3442-5AT10-0FA0。4AM3442-5AD40-0FA0。4AM3442-5AN00-0EA1。4AM3442-5AN00-0EA0。4AM3442-5AV00-0EA0。4AM3442-8JN00-0EA0。4AM3442-8JD40-0FA0。4AM3442-5CJ10-0FA0。4AM3442-5CT10-0FA0。4AM3442-5CT10-0FA1。4AM3442-5CN00-0EA0。4AM3442-5FJ10-0FA0。4AM3442-5FT10-0FA0。4AM3442-5FN00-0EA0。4AM3442-8DN00-0EA0。4AM3442-8DD40-0FA0。4AM3442-8DV00-0EA0。4AM3442-8EN00-0EA0。4AM3442-8ED40-0FA0。4AM3442-5LT10-0FA0。4AM3442-5MT10-0FA0。4AM3842-4TN00-0ED0。4AM3842-4TV00-0ED0。4AM3842-5AT10-0FD0。4AM3842-4TJ10-0FC0。4AM3842-4TT10-0FC0。4AM3842-4TN00-0EC0。4AM3842-8DD40-0FC0。4AM3842-4TJ10-0FA0。4AM3842-4TT10-0FA0。4AM3842-4TN00-0EA1。4AM3842-4TN00-0EA0。4AM3842-4TV00-0EA0。4AM3842-5AJ10-0FA0。4AM3842-5AT10-0FA2。4AM3842-5AT10-0FA1。4AM3842-5AT10-0FA0。4AM3842-5AN00-0EA1。4AM3842-5AN00-0EA0。4AM3842-5AV00-0EA0。4AM3842-8JD40-1FA1。4AM3842-8JN00-0EA0。4AM3842-8JD40-0FA1。4AM3842-8JD40-0FA0。4AM3842-5CJ10-0FA0。4AM3842-5CT10-0FA0。4AM3842-5FT10-0FA1。4AM3842-5FT10-0FA0。4AM3842-5FN00-0EA0。4AM3842-8DN00-0EA0。4AM3842-8DD40-0FA0。4AM3842-8DV00-0EA0。4AM3842-8EN00-0EA0。4AM3842-8ED40-0FA0。4AM3842-5MT10-0FA0。4AM4042-4TJ10-0FD0。4AM4042-4TT10-0FD0。4AM4042-4TN00-0ED0。4AM4042-5AT10-0FD0。4AM4042-5AN00-0ED0。4AM4042-8JN00-0ED0。4AM4042-8DD40-0FD0。4AM4042-4TT10-0FC0。4AM4042-5AT10-0FC0。4AM4042-5MT10-0FC0。4AM4342-4TN00-0ED0。4AM4042-4TJ10-0FA0。4AM4042-4TT10-0FA0。4AM4042-4TN00-0EA1。4AM4042-4TN00-0EA0。4AM4042-4TV00-0EA0。4AM4042-5AJ10-0FA0。4AM4042-5AT10-0FA1。4AM4042-5AT10-0FA0。4AM4042-5AN00-0EA1。4AM4042-5AN00-0EA0。4AM4042-5AV00-0EA0。4AM4042-8JN00-0EA0。4AM4042-8JD40-0FA0。4AM4042-5CJ10-0FA0。4AM4042-5CT10-0FA0。4AM4042-5CD40-0FA0。4AM4042-5FJ10-0FA0。4AM4042-5FT10-0FA0。4AM4042-8DN00-0EA0。4AM4042-8DD40-0FA0。4AM4042-8DV00-0EA0。4AM4042-8EN00-0EA0。4AM4042-8ED40-0FA0。4AM4042-8EV00-0EA0。4AM4042-5LT10-0FA0。4AM4042-5MT10-0FA0。4AM4342-4TJ10-0FC0。4AM4342-4TN00-0EC0。4AM4342-5AT10-0FC0。4AM4642-5AT10-0FD0。4AM4642-5AN00-0ED0。4AM4342-4TJ10-0FA0。4AM4342-4TT10-0FB0。4AM4342-4TT10-0FA0。4AM4342-4TN00-0EB0。4AM4342-4TN00-0EA0。4AM4342-4TV00-0EA0。4AM4342-5AJ10-0FA0。4AM4342-5AT10-0FA1。4AM4342-5AT10-0FB0。4AM4342-5AT10-0FA0。4AM4342-5AN00-0EA1。4AM4342-5AN00-0EB0。4AM4342-5AN00-0EA0。4AM4342-5AV00-0EA0。4AM4342-8JD40-0FA0。4AM4342-8JN00-0EA0。4AM4342-5CJ10-0FA0。4AM4342-5CT10-0FA0。4AM4342-5FJ10-0FA0。4AM4342-5FT10-0FA0。4AM4342-5FT10-0FB0。4AM4342-8DN00-0EB0。4AM4342-8DN00-0EA0。4AM4342-8DD40-0FB0。
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Working principle:
The transformer consists of an iron core (or magnetic core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the remaining windings are called secondary coils. It can transform AC voltage, current and impedance. The simplest iron core transformer is composed of an iron core made of soft magnetic material and two coils with different turns covering the iron core.
The role of the core is to strengthen the magnetic coupling between the two coils. In order to reduce the eddy current and hysteresis loss in the iron, the core is made of laminated silicon steel sheets; there is no electrical connection between the two coils, and the coils are made of insulated copper wires (or aluminum wires). One coil connected to the AC power source is called the primary coil (or primary coil), and the other coil connected to the electrical appliance is called the secondary coil (or secondary coil). The actual transformer is very complicated, and inevitably there are copper loss (heating of coil resistance), iron loss (heating of iron core) and magnetic leakage (magnetic induction wire closed by air), etc. In order to simplify the discussion, only the ideal transformer is introduced here. The conditions for an ideal transformer to be established are: ignore the leakage flux, ignore the resistance of the primary and secondary coils, ignore the loss of the core, and ignore the no-load current (the current in the primary coil of the secondary coil is open). For example, when the power transformer is running at full load (the secondary coil output rated power), it is close to the ideal transformer.
Transformers are static electrical appliances made using the principle of electromagnetic induction. When the original coil of the transformer is connected to the AC power supply, an alternating magnetic flux is generated in the iron core, which is generally indicated by φ. The φ in the primary and secondary coils are the same, and φ is also a simple harmonic function. The table is φ = φmsinωt. According to Faraday's law of electromagnetic induction, the induced electromotive force in the primary and secondary coils is e1 = -N1dφ / dt and e2 = -N2dφ / dt. In the formula, N1 and N2 are the turns of the primary and secondary coils. It can be seen that U1 = -e1 and U2 = e2 (the physical quantity of the original coil is represented by the subscript 1 and the physical quantity of the secondary coil is represented by the subscript 2). = N1 / N2, called the transformation ratio of the transformer. From the above formula, U1 / U2 = -N1 / N2 = -k, that is, the ratio of the effective value of the transformer primary and secondary coil voltages is equal to its turns ratio and the phase difference between the primary and secondary coil voltages is π.
It is further concluded that:
U1 / U2 = N1 / N2
In the case where the no-load current can be ignored, there is I1 / I2 = -N2 / N1, that is, the effective value of the primary and secondary coil current is inversely proportional to the number of turns and the phase difference is π.
In turn available
I1 / I2 = N2 / N1
The power of the primary and secondary coils of an ideal transformer is equal P1 = P2. It shows that the ideal transformer itself has no power loss. The actual transformer always has losses, and its efficiency is η = P2 / P1. The efficiency of power transformers is very high, up to more than 90%
Characteristic Parameters:
working frequency
Transformer core loss has a great relationship with frequency, so it should be designed and used according to the frequency of use. This frequency is called the operating frequency.
rated power
Under the specified frequency and voltage, the transformer can work for a long time without exceeding the output power of the specified temperature rise.
Rated voltage
Refers to the voltage allowed to be applied on the coil of the transformer, which shall not be greater than the specified value during operation.
Voltage ratio
Refers to the ratio of transformer primary voltage and secondary voltage, there is a difference between no-load voltage ratio and load voltage ratio.
No-load current
When the secondary of the transformer is open, the primary still has a certain current. This part of the current is called the no-load current. The no-load current is composed of magnetizing current (generating magnetic flux) and iron loss current (caused by core loss). For a 50Hz power transformer, the no-load current is basically equal to the magnetizing current.
Load loss
Refers to the power loss measured at the primary when the transformer secondary is open. The main loss is the core loss, followed by the no-load current loss (copper loss) on the primary coil copper resistance, this part of the loss is very small.
effectiveness
Refers to the percentage of the ratio of secondary power P2 to primary power P1. Generally, the greater the rated power of the transformer, the higher the efficiency.
Insulation resistance
It indicates the insulation performance between each coil of the transformer and between each coil and the iron core. The level of insulation resistance is related to the performance of the insulating material used, the temperature level and the degree of humidity.
