If you have a 3-phase motor but only single-phase power in your shop, you face a classic problem: either change the motor, add a rotary converter, or find a drive that does the conversion. The CNC 1 To 3 Phase 220V Variable Frequency Drive Inverter VFD VSD 7.5KW 10HP offers a different route: use a variable frequency drive as both a phase converter and a speed controller. Priced at USD 118.92, this unit promises to run constant-torque loads like air compressors and HVAC units as well as variable-torque loads like pumps and fans. But is it the right pick for your setup?
Quick Verdict
The CNC 7.5KW 10HP VFD is a single-phase-to-three-phase drive rated for 7.5KW (10HP) motors. It uses SPWM control, provides 0-400Hz frequency adjustment, and offers digital and analog control terminals. For a workshop that needs to run a 3-phase motor from a 220V single-phase supply, this drive can do double duty as a phase converter and a speed control. It's not a plug-and-play appliance, but for someone comfortable with motor wiring, it's a practical and affordable solution.
Who It Suits
This drive is designed for anyone running a 3-phase machine off a 220V single-phase line. It's a natural fit for small shops, hobbyists, or maintenance people who need to power a lathe, pump, fan, blower, or compressor. The description explicitly calls out hard-starting air compressors and HVAC units for constant torque, and pumps and fans for variable torque. So if you have a motor that needs adjustable speed or just need to convert single-phase to three-phase, this unit fits the bill.
The CNC 7.5KW 10HP VFD
Input wiring is straightforward: for single-phase input, connect the incoming wires to the R and S terminals. The drive accepts 220VAC input at 48-63Hz, and the output is 3-phase 220V. The maximum current per phase is 20A, so you'll need to confirm your motor's full-load current stays within that limit. The frequency range goes from 0 to 400Hz, giving you a broad speed range for different applications.
One feature that stands out is the multiplex terminal design. Unlike simpler drives that offer just a few basic inputs, this unit includes two sets of terminal functions with rich digital and analog control terminals. That's a meaningful advantage if you want to wire up external switches, potentiometers, or PLC signals for more versatile motor control.
Meaningful Trade-Offs
The biggest consideration is matching the drive to your motor. The 7.5KW / 10HP rating and 20A per-phase limit mean you should check the motor's nameplate before buying. If your motor draws more than 20A per phase, this drive won't be sufficient. Also, the input voltage tolerance is listed as 220VAC ±5%, so if your supply voltage drifts significantly, you may need to address that separately. And while the drive can accept 1 or 3-phase input, the single-phase hookup uses only the R and S terminals, so make sure you're comfortable with that wiring scheme.
Another trade-off is the 0-400Hz range. While broad, it means you need to configure the drive correctly for your motor's rated frequency (usually 50 or 60Hz) to avoid over-speeding it. This isn't a flaw, but it does require a basic understanding of VFD parameters.
Bottom Line
At USD 118.92, the CNC 7.5KW 10HP VFD delivers a solid combination of phase conversion and speed control for 3-phase motors running from single-phase power. It's well-suited for pumps, fans, compressors, and similar loads, thanks to its SPWM control and flexible terminal options. The main thing to do before buying is verify your motor's current draw against the 20A per-phase limit and confirm your input voltage stays within 220V ±5%. If those match, this drive is a straightforward and affordable answer to a very common shop problem.
