Our company concentrates on VFD design and VFD manufacture.
A variable frequency drive controls alternating current torque and motor speed in electro-mechanical drive systems. In layman’s terms, it is an adjustable speed drive that regulates the frequency and voltage to the motor. You can find variable frequency drives, or VFDs, in everything from small appliances to giant compressors.
Variable Frequency Drive LLC is a leader among variable frequency drive suppliers. Our company concentrates on VFD design and VFD manufacture. Variable Frequency Drive LLC is china VFDS Company located in Shenzhen. Our main focus is creating the highest quality products. The main products single phase to three phase VFD, three Phases to three Phase VFD and so on.
I recently was doing some energy savings projections that involved looking at what would happen if I added a Variable Frequency Drive (VFD) to a pump serving a hot water system. In the course of doing that, I got to wondering if there had been improvements in VFD efficiency that I should take into account since the last time I researched drive efficiency.
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A VFD consists of a rectifier/filter section which converts the incoming AC to DC. This high-voltage DC is then converted back to AC with additional controls which provide the speed control. The problem with single-phase AC power is at the input side of the VFD, the part that converts incoming power to DC. When you rectify a three-phase power source, the output voltage from the rectifier never drops below 50% of the peak voltage. This makes it real easy to filter and provide pure DC to the rest of the equipment.
When you rectify single-phase power, the output voltage of the rectifier drops to zero 120 times a second. The task of filtering this to provide pure DC is much more difficult. The standard rule-of-thumb is to derate the VFD by 50% when operating from a single-phase source. Thus, if you want to run a 5HP motor, you need a 10HP VFD. I would not recommend operation of any VFD on single-phase power unless such usage is proper according to the manufacturer. If not discussed in the owner's manual, you can always contact the maker's technical support department and ask for assistance.
VFDs are used to replace three phase service when only single phase is available. But VFDs can do lots more than just get you three-phase. There are cases where you will need three phase input to a VFD but these are super advanced and I will not get into these here.
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