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Due to the ability to operate at a wide range of speeds, a variable speed motor knows when to increase its output and decrease its output depending on the settings of your thermostat . This allows your system to function at a low capacity when the temperatures outside are not considered extreme. One of the largest contributors to high energy bills can come from a single-speed blower motor operating too much during mild temperatures.
One of the largest misconceptions of the HVAC industry today is that in order to make your system more energy-efficient, you sometimes have to sacrifice comfort. That could not be further from the truth when it comes to a system with a variable-speed blower motor. A variable speed air conditioner will automatically adapt to make sure it is supplying the perfect amount of output for the temperature settings you prefer. All while increasing the SEER level of your heating and cooling system.
This kind of driving mode has the function of speed regulation, which is generally used in large-scale vertical roller mill which requires speed regulation.
Advantages: good soft starting performance, linear controllable speed curve when starting, linear controllable speed curve when stopping, good electric braking performance, stepless speed change, excellent controllable performance, closed-loop control, high reliability.
Disadvantages: the price is very expensive, the silicon controlled rectifier system is complex, the electric control equipment covers a large area, the power factor is low, the DC motor has slip ring, the brush is worn, the maintenance workload is large, there is no explosion-proof type at present, so it can not be used in the coal mine.
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