QTR 06 110V Single Phase Variable Frequency Drive

This is a quick tool review of the HuanYang 110VAC - 110VAC VFD for motor speed control.

Please Note: I am a beginning machinist and I do not pretend to know everything. Please always operate machinery in a safe manner and if you don't know, find a reliable source. DO NOT COPY ME. I make a lot of mistakes. I provide these videos for entertainment only.

[BillyTpower]

What a revelation, truly. until I saw this video i was mistakenly under the assumption that I could not vary the speed of a single phase motor. Thank You for this video.

[patriciovarela]

Hello

I have a motor 220V AC single phase and I need to control RPM. I need a VFD with an output 220V AC single phase.

I see some people just using a VFD with a 3 phase output and conecting the single phase motor to the terminal U V or U W or VW.

The problem with this is when you use a single phase motor in a 3 phase current you use one line U V W and the neutral N.

With the U V or U W or VW the motor will not run properly.

Please correct me if im wrong.
Thank you.

[whidbeyman]

Nice work. Another fine point: your VFD undoubtedly uses the 'V proportional to F' algorithm to keep from overdriving the motor. This means that the voltage at 30 Hz will actually be about 55 Vrms. This makes the current relatively constant, rather than increasing with decreasing frequency (which it would do if you kept input voltage constant). Going above 60 Hz in frequency, the voltage should go above 110 Vrms, but there will be a limitation due to the fact that the DC bus voltage is probably only about 170 V, so forming the sine wave approximation with PWM becomes theoretically impossible. They MAY use a voltage doubler rectifier or boost switching circuit to raise the DC bus voltage, but I doubt it for a low-cost product. It will be simple enough to find out: Use an rms voltmeter to monitor the motor input voltage and/or observe the PWM waveform with a scope. (Of course, you must take precautions to probe AC mains circuits with a mains powered oscilloscope.) I am betting that they simply limit the rms output voltage to about 110 V, even when you go above 60 Hz. The motor will run and the speed will increase with frequency, but torque will be diminished, which is probably OK for something like a grinder. BTW, there may be some parameter setting in the VFD that limits the max frequency... might be a good idea to set it such that you can't exceed wheel ratings.

[sludgieslures]

At least your honest about the mistakes. Great video. Cheers.

[valveman]

You could add a switch to take the starting cap out once it is running, then you can decrease speed without the worry of the starting cap kicking in. Didn't know you could use a multiphase VFD for a single-phase motor in and out. Good to know!

[michaelshansen]

Great video easy to follow and I loved it.


Mike Hansen

[bid]

I’ve been old that grinding carbide inserts using a high speed grinder can create micro fractures in the insert. Grinding carbide inserts using a slow rpm grinder avoids the problem and makes for a terrific knife sharpener.

[normandohernandezmejia]

Hello, I have a question, inside your tool has a capacitor? Does that mean that you connected it directly to the inverter without removing it or did you connect it directly with a capacitor?

[sadbutwedidntstartit]

Question, you mention hooking up the 120VAC to any of the 2 inputs. . Do you mean that you hook up 'L' to R, S or T and 'N' to any of the other two that are not Line? Or do you hook up 'L' to R, S or T and hook 'n' - Neutral to Ground on the unit ? Thanks.

[ForTheEarsToHear]

I'm wondering how long your motor is going to last as most that are using VFD opt for a 3 ph induction motor. The units I've been looking at are for 1HP, 220v 3ph motors. Paired with a VFD unit 220v 1ph/ 220v 3ph. output. Interesting to see if you have motor problem later on. Not wishing you anything bad. It's difficult to find those that really understand the correct use and application for the VFD. I find motor sales reps that will just sell you anything. Then tell you...we have a 50% restocking fee if your not happy :) Liked your video.

[livinginthewild]

I suspect your bench grinder has a centrifugal switch that only disconnects the starting capacitor. when you hook it up to the VFD you can wire out both the switch and the caps

[Skinflaps_Meatslapper]

How's the motor holding up these days? My primary hesitation in doing something like this is making sure the motor doesn't overheat, as most candidates for this have what amounts to a direct drive cooling fan. Drop the RPM and the fan drops total CFM, but the same torque is still available from the motor...so you potentially have a situation where the motor is making the same heat with a lot less airflow.

[sadbutwedidntstartit]

I found that you hook up 120 VAC Line to 'R' and 120 VAC N to 'T' and ground to ground and that should suffice. I saw it wired that way in videos but it really wasn't pointed out. Thanks

[aggeos]

If you have or are worried about overvoltage in your motor/drive just put the resistor instead of the jumper, adjust the necessary parameters and it will deal with the over-voltage

[onehot]

So let me get this straight, you did not remove the caps. from the grinder motor? I am confused!

[herbiefpv]

Dang wish i knew you personally lol trying to get a 220single phase vfd to work with my single phase paint booth fan motor

[coolsupermario]

thanks for the info, I have a grinder similar to the smaller one you showed in the video, I bought a motor controller and connected it to the grinder and it sounds very loudly. I wonder if I damaged the circuit?

[haijiazhu]

Those are actually 3 phase VFD, typically, if the VFD detect one phase missing, it will stop the operation. However, if you force the VFD to output the phase, than you have this single phase variable frequency drive. By the way, you may need to remove the cap on the motor.

[leeisenberg]

Thanks for sharing. Where did u buy from? - take care from Tn

[bendavis]

Thanks for the video. I have a Grizzly 1/2 HP H5373 Induction Motor on a wood lathe. I want to put a VFD on it but I am not sure the motor is rated for VFD. Can you help me how to figure that out.