AC Motor Choice

[Arno]

Vicpopo,

What would i do without your expertise.
Thank you, again, for taking the time to educate me.

All right, after everything I read and this new bit of explanations, I will choose a 3phase motor.
This will then work with inverters, which I hope I can get with Vector control, instead of the normal U/Hz.
Those are quite a bit pricier though.
I found these, which seem appropriate:
http://www.automationdirect.com/adc/Sho ... 9/GS3-22P0
They even work in open loop, with the feedback controller optional, interesting...

Do I need to be worried about any other particulars of the motors?
I saw some that list Wye/Double Wye...
What are we after here?

I see that motors that have Insulation Class F, other have B.
I believe I read somewhere that we need F?
Is this correct?

Inverter Duty.
I understand that this is almost a must have for these motors, so that they last a long time.

Once I have these pieces of information, I will be able to hunt for the proper motor.

Thank you again for all the help.
Cordially,
Arnaud

[vicpopo]

Hi Arno,

For the inverter ask to te seller all informations you need.I don't know if it can drive the motor in VFC mode.
One point precision.In my setup I used one inverter for each motor.I don't believe that one inverter could drive several motors.It maybe exist but I do not shown this.
That means that the power of the inverter has to be adjusted to the motor power.
The one you linked has a power of 2hp.It's too much if you want to drive one motor with 550Watt or less.

For the class F , I think it's not necessary

@+

[Arno]

Understood, I will make sure that the inverter can drive the motor in VFC mode.
I was under the impression that vector mode took care of that, I realize I may be wrong.

Some inverters can drive multiple motors, but they become slave to each other, not independent.
I realize I will have to purchase 3 inverters.

Any comment on the Wye/Double Wye info?
Are all 3-phase AC motors suitable otherwise?

Thank you.
Arno

[vicpopo]

Any comment on the Wye/Double Wye info?
Are all 3-phase AC motors suitable otherwise?

Thank you.
Arno

Could you develop ? Wye/Double Wye info? I don't know what are you talking about ?

Best Regards

[Arno]

[Could you develop ? Wye/Double Wye info? I don't know what are you talking about ?

Well, I saw a motor that listed Wye/Double Wye configuration, not sure what it meant...
It is in the motor I listed above:
http://www.globalindustrial.com/p/motor ... 0rpm-motor

I have not seen this anywhere else, not sure if this was simple marketing ploy, or real requirements.

Cordially,
Arno

[vicpopo]

Hi,

It's just how to connect the motor I believe .From the french translation we speak star or delta ,I suppose.
With my configuration I connected the motor in delta because the inverter supplies each phase with 220 volt from the single phase 220volt.

@+

[Arno]

Hi,

It's just how to connect the motor I believe .From the french translation we speak star or delta ,I suppose.
With my configuration I connected the motor in delta because the inverter supplies each phase with 220 volt from the single phase 220volt.
@+

Thank you.
I looked around and these particular motors seem very attractive.
1000:1 constant torque
Vector duty
etc...
http://www.automationdirect.com/adc/Sho ... HP%29/Y535
More detailed specs are here:

motorsblackmax.pdf

(317.57 KiB) Downloaded 833 times

Cordially,
Arno

[Arno]

Interesting read between General Purpose motors and Inverted Duty motors here:
http://motors.automationdirect.com/Info ... mpare.html
PDF attached here:

General Purpose vs Inverter Duty.pdf

(409.06 KiB) Downloaded 908 times

In summary, we definitely should use Inverted Duty motors for our applications.

[vicpopo]

Hi ,

Obviously motors must be able to be driven with an inverter.
If you use 3 phase motor you don't need to come over 550watt , 0,5 hp (around 370 watt) is enough for each motor.With a right choosen gearbox ( max 20 turn / min ) , you have enough torque to move your plateform (150 kg ).
Good night!!

[Arno]

Obviously motors must be able to be driven with an inverter.

Sorry if I was not clear.
What I meant is that I found out there were 3phase general usage motor, and 3phase inverted duty motors, which are more geared towards the usage we have with our simulators.
As for the HP rating of the motors, since I will not be using (not the plan anyway) a central pivot, I feel that I may need more than just 0.5HP.
Once I make the investment, the cost difference, while not negligible, is not crazy compared to having to repurchase motors for example.

I will try to choose wisely indeed, no need to waste money.
I think that I will need to get some more physics calculations done in order to ensure that I am not over-sizing or limiting myself.
Thank you for your help getting the right stuff!

Good night!
Arno