Single phase VFD drive normally is used in 200V AC to 240V AC in low power applications, like small pumps. The AC motor's input need to be three phase as all of the drives are three phase output. In our factory, the 1 phase AC drives, from 0.4kW to 2.2kW.
1.5kw 2hp vfd 7a 220v single phase variable speed drive vsd drive inverter ac drive inverter with rs-485 communication interface 1.5kw 2hp 7a 220vac single phase variable frequency driver vsd vfd inverter New hy 2.2kw 220v 3hp variable frequency drive vfd inverter output 3 phase 400hz 10a Hot vfd single phase 220v in three phase out at2 frequency converter 750w 0.75kw 5a three phase moto speed controller inverter Vfd007b21a delta vfd-b inverter vfd ac driver 1 phase 220v 750w 1hp 5a 400hz new in box Hy inverter 3kw 220v 13a variable frequency drive vfd inverter 4hp output 3 phase Vfd single phase 1.5kw 220v variable frequency drive inverter output 1 phase vfd.
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.
However, 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 VFD rated for 10HP.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.
A VFD drive supplied from a 3 phase system will have a bank of rectifiers at the input feeding a capacitor bank. The capacitor bank serves two purposes --- to filter some of the input ripple from the rectifiers, and to absorb some energy during deceleration. Rectifier-capacitor input filters produce non-sinusoidal pulses of current in the input lines. This means the RMS input current is higher than if the same energy was transferred from a DC source. If you take a VFD drive designed for a 3 phase input and use it on a single phase system, then the diodes and the filter bank may be under sized. This is why you may need a 3 times larger VFD. It is not because of the DC to AC conversion electronics, but because of the input diodes and capacitors.
VFDs typically run on single phase power and convert it to three phase power to the motor. Three phase is preferred for speed control as it is easier to implement and maintains near 100% torque at low speeds Bottom line. Buy a VFD, connect it to a 3 phase motor, plug it into 120 or 240 single phase outlet and you are good to go. BTW, I have a couple of Rob's units, one for my KMG and another for the 9 inch disk grinder. They are top quality and easy to set up and if you do have a problem Rob is always there to help.