VFD's and 3phase Induction motors FAQ corner / pls. Read all first

Hello what's up speedy? You don't know me, but I know you lol.
I was hoping that I didn't need a gearbox.

Here is a gearbox:
TEC FCNDK50- Right-angle Worm Gearbox for 4 Pole 80 Frame B14 Motor (motor is not included).
Ratio: 15:1
Output Speed: 91.3RPM for Input Speed at 1370RPM (50Hz)
Max Output Torque: 69Nm
Efficiency: 79%
Max Input Power: 0.85kW for 4 pole motor.

Output with 0.55kW 4 Pole Motor - 0.43kW x 91.3RPM at 50Hz - 45.4Nm at 1.5 Service Factor.

Lubrication: Synthetic Oil, sealed for life and maintenance-free
Input flange and shaft socket to suit IEC 80 Frame Motor. 19mm bore diameter, 120mm flange with 4 x M6 Tapped holes equispaced on 100mm PCD with 80mm register.
Weight: 3.5kg

There is another just like it, except for different mounts: Model FCNDK50
Input flange and shaft socket to suit IEC 80 Frame Motor - 19mm bore diameter, 200mm flange with 4 x 11mm holes equispaced on 165mm PCD with 130mm register.

But what speed?

I would think, the lower speed is better, since we need to be about 25 rpm.

Wow you said 50:1. I don't know why I posted that 15:1
50:1
https://inverterdrive.com/group/Gearboxes/TEC-FCNDK63-27RPM-right-angled-Gearbox-550W/

Oh ok, I was hoping the driver controlled RPM and would allow 20-30 RPM without a gearbox. Much to learn grasshopper.

Edit: I would much rather the smooth look over the TEC I linked, but can't find a motor/gear pair that comes close to the price.

Thanks for that info! Caught it while reading this again.

Thank you!

Why not use a some real calculations to get correct motor and gear size for the load you need?
https://www.dropbox.com/s/1lioovcpv3av8dq/6DOF_platform_load_estimate_AC_Motor_calculation.xlsx

For a 180 degree crank arm that moves top to bottom with its maximum speed in 1 sec. then a full revolution is achieved in 2 seconds => the RPM of this crank arm is 30 ...

With a gearbox that is a 50:1 ratio the motor speed should be in the range of 1500 RPM or higher with a normal VFD settings " No over frequency driving is needed " .

The gearbox should be rated with the same HP as the motor .

This used motor is from USA and the gear labeled having a torque of 450 lb-in with an output speed of 125 RPM ...
http://www.ebay.com/itm/SEW-EURODRI...664544?hash=item3acd9c2120:g:S4oAAOSw8gVX6TmV

this one is new condition having 926 lb-in and 12-72 RPM ...
http://www.ebay.com/itm/SEW-EURODRI...677148?hash=item1a25f0a35c:g:wUIAAOSwTuJYpczi

I love SEW EURODRIVE .
Have Fun

"ThatDudeThere Stated: Edit: I would much rather the smooth look over the TEC I linked, but can't find a motor/gear pair that comes close to the price.

The TEC design "allows" for quicker dissipation of heat with the fins..........may not be as much for "eye candy" but sure does the job.

Tom

Interesting motors. My first concern is having slightly mismatching motors if I can't find 3 exact.

Good point, and I did consider that maybe the fins are needed because of the cast iron. Also, "why did they use cast iron? Is it because their motors get hotter than others?" I do like the smooth look, but I also like this industrial classic look, but it will be more to clean the fins.

Extremely informative videos guys ...
You have to watch and understand all the VFD related wiring/operation here ...
And as mentioned before all the needed programming through the front panel for a VFD is just the start/stop timing and what terminals to be used for the operation commands & the frequency commands .

And here is an explanation of what dynamic braking is:http://www.ab.com/support/abdrives/documentation/techpapers/RegenOverview01.pdf
Very good to understand what it is. @speedy would you say this is important, and worth spending for a unit with this feature?

NOT needed here ...
As long as you're using a gearbox that will prevent the load from spinning the motor's rotor generating a feedback voltage to the VFD ... otherwise the VFD will handle the start/stop/reverse pretty much easy .

Thanks! I found a GS1 VFD used that I couldn't pass up, so it's on the way! (I have to stay off of ebay until I pay some bills first)

I use GS1 VFD's in my setup. Great product.

Some Things that are necessary for any simulator ...


Main Circuit Breaker ...


Indicator light ... that are useful to see if you have a good power to your devices ... they comes with different voltage ratings for all operating voltages stages .






A "Kill switch" or "Emergency switch" that a must be used with the power source of the motors or the motors driver ... some models come with indicator lamp and some of them comes with a KEY for the ON state ...


These "Emergency switches" can provide about 3A max. for operating a CONTRACTOR like next pictures in case of using big Amps AC- voltage ... I suggest using a 220v coil [A1-A2] contactor type as it can be easily wired in parallel to the hot input without any external power supply and still gives you a full operation control .



Those Plugs are very useful and cheap ...



For Cables / Computer / Control shielding ... I suggest this Aluminium Tap .

Hey guys,

first of all thank you for all the informations in this thread.

im just doing some researches on which AC-Motors i should use for my 6DOF stewart platform.
For a lever of about 160 to 200 mm and a overall platform weight of approx 200 kg i chose these motors with 50:1 wormgear (which is selflocking from external load at this size) and VFD; output speed 56 RPM 136 Nm.
From my calculations, for the static load approx. 6x 55 Nm are necessary. The rest of the torque (81 Nm) is for acceleration reserve and reserve in general (i would like to reach at least +0,5 G).
With VFD the lever should rotate by 180° at 10Hz in 2,7 seconds (0,06 m/s for Heave) and at 60Hz in 0,45 seconds (0,36 m/s for Heave) and should be (theoreticall) able to reach 3G, which will be limited either by physical or software limits to +0,5 to 1 G (hope so, im waiting for exact values of mass of moment inertia from motor and gearbox by supplier).

I'm not sure if the speed / torque is too high or low, as opinions drift apart in forums.
Maybe some experienced users could give me a Feedback, if im completely wrong or on the right path to a AC actuated 6DOF .

Greetings

Konsta