Installing variable frequency drives (VFD) are one of the easiest ways to save a significant amount of the energy required to run fans and pumps. Most fan and pump devices are very inefficient when running at part-load conditions, so installing a VFD drastically reduces the energy consumed during those part-load periods. Over the typical life cycle, a VFD greatly reduces the total cost of operation.
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A VFD is similar to the motor to which it’s attached, they both convert power to a usable form. In the case of an induction motor, the electrical power supplied to it is converted to mechanical power through the rotation of the motor’s rotor and the torque that it produces through motor slip. A VFD, on the other hand, will convert its incoming power, a fixed voltage and frequency, to a variable voltage and frequency. This same concept is also the basis to vary the speed of the motor without the need of adjustable pulleys or gearing changes.
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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.
All VFD applications
require programming. You have to make it do what you want. Parameters like minimum and maximum frequencies, number of motor poles, maximum current, overload response, braking behavior, acceleration profiles, etc. must be set by the user to match your installation's needs. The voltage/frequency curve is user configurable too, which is very useful for your kind of application where you are operating outside the normal frequency range of the motor. Good VFDs come with a display that can be set to show the motor speed (or any number of other parameters). If I were doing this, I would use a 1HP 208V two-pole motor and a 1HP VFD with a 240V input.
The variable frequency drive is becoming popular in setting up 3phase powered equipment. Most of the units are capable of producing variable frequency 3 phase power from a single phase source. The downside being there is a reduction of power rating. In other words, you would need a 5-6HP VFD to run a 3HP motor if the input is single phase. Now the beauty of using a VFD inverter is your ability to control motor speed. You can crank the cycles down so that the motor is barely turning. Or if you needed more speed, that is possible as well. Maybe even to the point of speeds that are dangerous. For instance, running a 60hertz motor at 400hertz.