Application case | 

Application of frequency converter in synchronous fans

01 Fan introduction

Fans include negative pressure fans, circulation fans, centrifugal fans, Roots blowers, boiler induced draft fans, copper furnace blowers, etc. They have large load inertia and are mechanical equipment for transmitting gas. They convert the motor's speed into mechanical energy. For a machine, the fan air volume is directly proportional to the motor speed, that is, changing the motor speed can change the fan air volume. The above are common asynchronous fans. In actual field applications, the asynchronous motor current is large and the mechanical resonance is obvious in the low-frequency standby state. In recent years, synchronous motors have been widely used in a variety of applications. Compared with asynchronous motors, synchronous fans have smaller currents under low-frequency operation, large torque, obvious energy-saving effects, low motor noise, etc., and their high-power advantages are more significant.

Application requirements for frequency converters:

The permanent magnet synchronous motor must be driven by a corresponding controller, which requires the inverter to run smoothly at low frequency and have multiple protection functions for the motor. When the air volume is small, it must be ensured that the temperature rise and motor noise of the motor do not exceed the allowable limit. scope.

02 System requirements

☆ On-site and DCS switching control;

☆ Quick start;

☆ When the damper is opened, the current instantly increases to 1.5 times the rated value or even greater and lasts for about one minute;

☆ Long-term low-speed operation requires large low-frequency torque and smooth operation.

03 Application Wiring Diagram

04 Features of synchronous inverter

1. The control core adopts high-performance DSP processor;

2. Vector control algorithm and intelligent control technology;

3. Advanced field weakening control algorithm improves the high-speed performance of the motor;

4. The power components adopt patch technology and have excellent heat dissipation structure design and temperature monitoring function, which greatly improves the controller's adaptability to high temperature environments;

5. Reliable and complete overheating and overcurrent protection function, using heat calculation algorithm to ensure reliable operation;

6. Parameters can be adjusted flexibly to match motors from different manufacturers.