How to adjust the working speed of wood pellet mill? The working speed is closely related with the dynamo. In general, low-efficient way to adjust speed is actually a kind of energy-conserving way. From the point of energy conservation, this way to adjust speed is not economic.
While, since it is quite simple to take this way and device price is cheap, it is still widely used for cases featured in short period for low-speed operation and small dynamo capacity. In particular, this way is quite energy-conserving for devices like draught fun and water pump, etc.
Pole-changing control is a kind of step speed change and it is not capable for synchronizing two dynamos. The typical way to realize the high-efficient speed control of asynchronous motor is frequency control. This way is also suitable to synchronous motor. Alternating-current motor, which adopts the frequency conversion, can not only realize the stepless speed regulation, but also can properly adjust the relationship between voltage and frequency according to different loads.
It can make the dynamo always work in high-efficient area. Alternating-current motor can remarkably change the driving performance, significantly lower the driving current of dynamo and increase the driving torque. Therefore, frequency conversion is the best way for speed control of alternating-current motor.
How to synchronously control the frequency conversion? Since dynamos can be directly linked together through the synchronous belt, speed feedback signal offers basis for synchronous control. To realize the real synchronization, we need to control the load on dynamos in balance.
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