Connecting a 120V VFD to single phase PSC motor in my bench grinder

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Proof of concept video that a single phase 110V /60Hz Permanent split capacitor AC induction motor on my grinder can be connected and operated as a variable speed motor using a 1-3 phase VFD with single phase 110V AC power.
More about Permanent Split Capacitor induction motors
www.industrial-electronics.co...
IMPORTANT NOTE: To make this work I needed to select the correct VFD for this type of operation. The VFD has to have an input of 110V and output of 110V. Please be aware there are many VFD's with different input and output phase and voltage configurations.
The VFD that I ordered and performed this test was VFD RATTMMOTOR 2.2KW VFD 110V Single to 3 Phase Inverter Variable Frequency Drive Spindle Motor Controller Converter 0-1000Hz+Extension Cable for CNC Router Milling Engraving Machine
www.amazon.ca/dp/B0B2DDMH94?p...
Actual model number: H100-2.2C2-1B
Input: 110V 50/60Hz
Output: 0-110V 12.5A 0-1000Hz
My test motor is King Canada KC-895LS 8" Low Speed Bench Grinder 120V, 3A, 1750RPM
Note this will not work with an AC motor that has a centrifugal clutch that disconnect the start capacitor once the motor starts up. Those motors have secondary starting windings that are thinner gage and are not designed for continuous operation.
Programming VFD and parameter values for this operation and VFD can be found on the following second video
• Programming my VFD to ...

Опубликовано:

29 дек 2022

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Комментарии : 38

@RobertSnyder100 11 месяцев назад

THIS WORKS !!!!!! I used the exact same H100 Vevor VFD...coupled to a Single Phase 1/4 HP 1725 RPM DELTA Drill Press motor....SMOOTH ...got down to about 45 RPM @ 5.0 HZ....ORIGINAL Belt reduction was at 620 RPM @ 60 Hz.😂😂😂😂😂🎉🎉🎉🎉 Thank you !!!!!! Followed your method to determine which capacitor lead to use !! And followed your RU-vid video on how to set the Function Parameters !!! Just Perfect 11111❤❤

@prairieedgeservice 11 месяцев назад

Thanks for sharing your different adaptation and success! Congratulations!

@luckyPiston 6 месяцев назад

So yur DP motor dosnt have a start winding, just a capacitor winding like the bench grinder ? so you basicly did exact same wiring as in the video

@Phantom-mk4kp Год назад

Brilliant, never thought of doing this. Would be useful for tool post grinder, as often different sized wheels are used

@denisshavaliev1849 Год назад

Thanks for great video with all the details about vfd

@slservice8269 Год назад

!! You should not run the grinder in reverse as the wheels will come off !! Great video, I'll try this on my grinder.

@toddbenko6701 Год назад

Yes a person has to double nut the wheels to lock the nut when running in reverse.

@kingofcastlechaos 29 дней назад

He is just showing the capability. Nobody would do something so stupid as grinding that way.................Never mind- your comment is spot on for the 21st century.

@MarkSchuster-ym3iy Год назад

I’m a luthier and have several large buffers and shapers n I’m thinking these WOUKD work on my buffers

@prairieedgeservice Год назад

Post a picture of the units. Especially of any of the make and model numbers idents of the motor. If you don't hear a click when the units startup or shut down chances are it would work.

@luckyPiston 6 месяцев назад

I would like to know if i can run a couple of leaf blower motors that are connected to my flow bench with this unit ? pretty sure they dont have caps , just a 2 speed on / off switch.

@toddbenko6701 6 месяцев назад

I don't know. You would have to open up the housing and validate. It should be a split pole motor with a run capacitor just like a bench grinder. Only little use a magnetic tap in the motor winding in place of a cap to produce the phase shift. I leaf blower requires more torque and hence is why I think it should have a cap.

@NLDHGRockStaR Год назад

thank you for this video . i do have a question if you let me , i'm over in Europe and i'm trying to figure out quite some time to ad a VFD to my drill press , its running on a single phase induction motor 0.55 KW 230 V 6.2 Amps 1420 RPM 50 Hz . and i was assuming i needed a single phase in & output for this motor in order to lower frequency? rpm and left/right turn . but from what i understand in your video that is not specific needed to accomplish ? is there a VFD type you could reccomand in my case ? kind regards from the Netherlands

@prairieedgeservice Год назад

First of all validate your type of induction motor. Many induction motors on drill presses have a starting capacitor which is linked to a centrifugal clutch. If you start up the motor and hear a defined click sound, it will have this centrifugal clutch system, in which a VFD probably can not be used. The secondary windings on these motors are not designed for sustained current application. If however you don't hear the click and you open up your induction motor and find only 1 running capacitor then yes you should be able to connect a VFD. If that is the case, I believe you will want to look for a VFD with 210-240V input single phase and 210-240V output in three phase. Now if your motor has the centrifugal clutch, I would look at just changing the whole motor with one one of the Vevor sewing machine motors that already comes with it's own VFD. you can get them in 550W 3/4 HP or 750W or 1000W versions. Because of the motor speed variability (~400-4000RPM), you could probably simplify to just a single belt pulley ratio. You just have to manage the motor mounting configuration. I use these type of Vevor motors for my 1x42 belt grinder and are great! eur.vevor.com/ac-servo-motor-c_11222/sewing-machine-motor-220v-550w-brushless-energy-saving-servo-motor-industrial-p_010409180232

@NLDHGRockStaR Год назад

@@prairieedgeservice thank you very much for this information , i will have a look and see what i have here. i know i have 1 capacitor , but i'm not sure about the click . when i turn the motor off however, i hear a sound that seems to me like an active break to stop the motor. like something is touching the rotor inside. it's hard to explain , but i hope that it makes some kind of sense.

@prairieedgeservice Год назад

@@NLDHGRockStaR some induction motors still only have 1capacitor but have the centrifugal clutch. It important to identify if you have the clutch. Watch the following video. m.ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-2XYdTogWcIA.html

@NLDHGRockStaR Год назад

@@prairieedgeservice thank you for your quick response , you really helped me out here. much preciated for your time and effort👌

@numeprenume512 Год назад

@@NLDHGRockStaR They almost never use centrifugal clutch motors in EU. If your drill press is the generic type that you just buy at a hardware store, it will work with any three phase or single phase input VFD, as shown in the video. The three phase input VFD has a three phase bridge rectifier and it doesn't care if you feed it three, two or as many phases as you like. Make sure to connect the VFD at 230V AC, not to 380/400V AC. Then read the user's manual and SET THE LOW INPUT VOLTAGE THRESHOLD at 200V. Otherwise, if you use a 400V AC input VFD and only feed it 230V AC, it will go into protection mode. Good luck!

@corollagl82 9 месяцев назад

I have a concrete agitator which motor always burns out, i want to use a single phase ac motor which I want to control speed to atleast 300 rpm for soap making, would this work?

@prairieedgeservice 9 месяцев назад

In high torque applications like you are using you should use a VFD like the one I showcased but actually use a 3 phase motor. You want and need the three phase windings in the motor to provide the torque needed, especially if you are slowing down the motor. A VFD will give you speed variability but if you exceed the torque of the motor with the electric current you will still end up burning out the windings. 300 RPM is really slow to and high torque at slow speed can cause the windings to burn out. For these type of applications, I would recommend some form geared down drive system. A VFD might help prevent your concrete agitator to prevent burnout but you would have to test to validate. The soft starts with the VFD would help control the high in-rush starting currents when under load. Can't be sure that it would fix your issue though.

@mustafadudde Год назад

I used FCU ac motor 1ph with Siemens v20,after 5 hours dry run the only thing I noticed motor temperature was high 56c while the ambient was 27c is there any recommendation to reduce the motor temperature?Thanks

@prairieedgeservice Год назад

Nothing that I know of. Using a split pole single phase motor under normal configuration will also get warm for that length of run. Because there are additional inefficiencies when using the 3 phase VFD, the motor will get warmer. If you are thinking of using a motor continuously for 5 hours, I would recommend getting a proper 3 phase motor.

@cdrive5757 8 месяцев назад

You can reduce motor heat on any electric motor (regardless of its phasing characteristics) by use of an auxiliary fan. In fact,.. this rule applies to DC motors too! Most shop grade motors utilize Totally Enclosed Fan Cooled (TEFC) motors. These motors are designed to keep shop grit out of the motor. Because of this a small fan is attached to the opposite end of the motor's spindle. When the motor is running this fan moves air across the outside of the motor housing. Unfortunately, when a VFD slows the motor's RPM, that little fan slows down too! So it's now moving much less air. When I converted my Midi lathe to 240VAC 3PH VFD drive I ran into the same issue. As a result, I attached (separately powered) muffin fan to the back end of the motor. Wakodahatchee Chris

@mustafadudde 8 месяцев назад

@@cdrive5757 Actually it is an Air conditioning air fan coil unit,no issues with body temperature it is working fine so far.

@cdrive5757 8 месяцев назад

@@mustafadudde Uh, the reason for that seems obvious. Besides, a motor driving a lathe is going to have very low speed demands that an air conditioner's air handler will never experience. PS: After re-reading your original post I now realize that my response was less than ideal in your application. On that note, most modern VFD's can be programmed to increase or decrease torque. This "Torque" setting does increase or decrease power consumption at a given speed. To the best of my knowledge Torque perimeters are adjusted via PWM superimposed on the variable frequency. The Torque settings are very useful for air movement applications, where torque demands are relatively low.

@norb231 10 месяцев назад

What if you have no access to the capacitor and you leave it in? What happens?

@prairieedgeservice 10 месяцев назад

The capacitor causes a phase shift for the second winding. You didn't identify how you would connect the VFD to the motor in that specific case. If you are connecting the VFD to the two phases then you are causing two outputs to be tied to the same wires as the capacitor. You will likely damage the output transistors of the VFD. But if you are like a college classmate of mine, he would purposefully bought polarized capacitors just because they would blow up when connected to an incorrect power source. Deviations from my proposal are yours to figure out. I only present the findings of my own test.

@soemin4847 7 месяцев назад

So, definitely, capacitors need to take off for AC single-phase output. Thanks

@RedfishCarolina 7 месяцев назад

Does this produce more heat on the motor at low rpm?

@prairieedgeservice 7 месяцев назад

The motor does get warm but how much really depends on how you use it. When I used my grinder @1750, and I really ground things down it would also get warm. I think the motor is still cooler running at 1000 RPM with more torque using the VFD than if I bogged down the 1750 down to 1000RPM because the fixed frequency original configuration only has current to make up for the speed reduction. The benefit of being able to set the speed slower or faster depending on the task is totally worth it for me.

@mysraalokbe817 Год назад

Hi, I also have a PSC motor, and I have four wires, two going to the motor and two from the winding to the capacitor, ik still confused about what I should do, when I remove the capacitor, I still have two wires, which one I should connect to the VFD, and what should I do with the second one? Thank you

@toddbenko6701 Год назад

Watch the video at time stamp 5:19. You need an ohm meter to measure the wire resistance and refer to the wiring diagram to select which of the two capacitor leads to use.

@toddbenko6701 Год назад

The second wire is connected direct to live line feed. So make sure it is protected with electrical tape or something

@mysraalokbe817 Год назад

@@toddbenko6701 so, I just need one of the lead of the capacitor to the VFD ?

@toddbenko6701 Год назад

@mysraalokbe817 correct. The second lead is already connected to the vfd using the hot (black) lead that would normally go to the plug. You proved that with an owm meter.