 |
REGULATOR OF REV FOR ASYNCHRONOUS MOTORS AND FREQUENCY CONVERTERS |
home » products |
Frequency converters
Electrical energy is energy which can be transformed with high efficiency. Rational use leads to significant savings in monetary terms. Frequency converters convert any standard three-phase motors in variable speed drive. Frequency speed control of motors is used in the textile, paper industry, lifting machinery, food industry, even washing machines.
Through drive with frequency converter is possible to control speed, torque, direction, starting and stopping of standard asynchronous or synchronous AC motors.
| |
|
Advantages:
1.Energy saving
2. Extends the life of the mechanical equipment
3. Reduces the starting current
4. Eliminates the voltage oscillations |
|
|
|
|
|
|
|
The flow of the pumps and fans can be changed in several ways: by throttling valves, bypass or similar. This means a significant loss of energy
Flow control pumps and fans through a three-phase asynchronous motors and frequency transformers is an alternative. This solution saves energy, money, respectively!
When reducing the flow by reducing the speed to save power. One half deceleration leads to a reduction in power consumption about 80%!
The number of poles is set design. A motor connected to a network 50Hz and 4 pole, rotates with 1500 rpm. Pole motor would rotate at 3000 rpm, etc.
The inverter amended not only frequency but also attached to the motor voltage. By this time providing the necessary shaft of the engine without causing overheating. The output frequency depends on the frequency of the network and can be both greater and less of it. I.e. engine speed can be adjusted both in synchronous and synchronous over. Frequency and voltage are limited and induction motor can start and accelerate from stationary.
Schematic diagram:
Rectifier: Through 6 diodes in the three-phase voltage Crescent is obtained with a constant frequency. DC voltage is accumulated on the capacitors (about 800VDC). In addition, capacitors and absorb excess energy. It is generated by the motor when large-over point should be brought to a stationary state. In large magnet using suitable brake resistors and transistors.
Inverter: It consists of 6 thyristors intermediate DC converters in adjustable voltage and adjustable frequency motor control. This is usually performed by pulse-width modulation.
|
