5303 with 20" or 5304 with 24" with delta wye?

[steveo]

Hey Doc,

I have surprise for you!. Please explain how i could figure the resistance out easily and i will check for you!

Photos of my x5304 Star/delta motor with air cooling

My Motor opened before modding

Phase wire removed; I forgot to take a picture ... but i dremeled the shaft to fit the extra 3 phase wires .. probably added an extra 2mm

New Phase wires ( used the original crystalite teflon wire ); New Hall sensor wires ( I used cat 5 cable or eithernet cable wires) .. they are strong and very thin!!

Sidecover (wires side) 8 holes right on top of the windings (3/8 holes (8 of them)) .. 4 holes (3/8) near the bearing.

almost finished...

now i need to get my relays and figure out how to wire it all up!..

-I just went for a hard ride.. stop & go and fairly hard on the throttle.. temp took very long to increase then normal .. I hit peak temp of 105degrees.. right after the hard ride .. + drag race 110cc atv Which i won (motor temp was at 90 degrees before drag race)


** Doc I notice something very interesting .. My controller ran alot cooler after i made the cooling modification to the motor .. less heat on motor .. less resistance.. easyier on the controller !!!!!! .. **

-steveo

 

[Doctorbass]

Wow.. That is excellent work Steveo!

Thanks for sharing!!

I'm a bit jalous about your first delta WYE mod on a X5 !! .. ... but very happy for you :wink:

What you observed about motor temp is a relaly great new!! you MUST share this news on a new thread to let everybody discovering that!!

The reason is because the motor inductance and resistance ratio is ameliorated !.. the less resiatance the less heat!

And a motor that heat , make it because of the resistance portion of the total winding... and as heat increase, the inductance reduce and the resistance increase...if i remember correctly.

The controller that heat less is also because of that.

Maybe ZaPpat, fechter or.... SAFE.... could elaborate on that.... and that would be appreciate :wink:


so you said.. you still can not try the delta wye because you dont have any relay?

If you garanty me that you can reship it to me before 20 may 2009, i can send mine to you to explore!! :wink:

otherwise.. continu to search on ebay.. often they have great contactor and relay for that..

Doc


Doc

 

[karma]

sure its going to run cooler, its not just the holes. installing extra phase wires will change the resistance . i have no cooling holes and my motor temp has gone down with the delta mod :wink:

 

[steveo]

Wow.. That is excellent work Steveo!

Thanks for sharing!!

I'm a bit jalous about your first delta WYE mod on a X5 !! .. ... but very happy for you :wink:

What you observed about motor temp is a relaly great new!! you MUST share this news on a new thread to let everybody discovering that!!

The reason is because the motor inductance and resistance ratio is ameliorated !.. the less resiatance the less heat!

And a motor that heat , make it because of the resistance portion of the total winding... and as heat increase, the inductance reduce and the resistance increase...if i remember correctly.

The controller that heat less is also because of that.

Maybe ZaPpat, fechter or.... SAFE.... could elaborate on that.... and that would be appreciate :wink:


so you said.. you still can not try the delta wye because you dont have any relay?

If you garanty me that you can reship it to me before 20 may 2009, i can send mine to you to explore!! :wink:

otherwise.. continu to search on ebay.. often they have great contactor and relay for that..

Doc


Doc

Hey Doc

Thanks for the offer on the relay !! .. I would prefer you keep it on your end .. I will do my best to get my own before you go for your drag run. Could you please search for some relays for me on ebay.

You mentioned that 12v relays are only good up to 75 volts.. I'm running 79.2nominal .. 87v off the charger ... I can not fine many 20-30v relays .. I say karmabike member on your tube use 120v relays .. 40 amp for his star delta setup! .. I know this is for dc rating ... Will these relays do if i run up to 100v 150amps on my controller ..

sorry .. i'm just starting to gain an understanding up the relay specifications.

I have a garage door repair shop near my home.. they have alot of relays in garage door openers .. industrial ones.. I'm hoping i will find one i could use

-steveo

 

[Doctorbass]

What is important to know is that the AC contact voltage you can use with a relay that is rated in DC will be like4-5 times higher!

You will discover that if you buy a good quality toggle switch or relay. you will see something like 30VDC, 120Vac

so the DC voltage rating is not the same.

ex:

I guess that having a setup for drawing 100A max from the battery a relay of 50-60A on the motor phase wire would be ok.

What is VERY important is that all contact MUST be switched exactly at the same time... so it is ceretain that using a complete relay of 3pdt contact would be better than having 3 x 1pdt relay.

maybe you should contact this guy:

http://stores.shop.ebay.com/Nicks-Sales__W0QQ_armrsZ1


Good news.. Tyco compagny is building relay VERY similar to the one i got!!!.. probably cheaper i guess!

one of them seems interesting for you: http://relays.tycoelectronics.com/datasheets/dh7bc.pdf

and here is the glosary: http://relays.tycoelectronics.com/aero.asp


What i think is that you should contact TYCO directly and ask them for a 3PDT relay with 50A contact and at least 115Vac. You should also specify that you dont necessarely need industrial or aerospace grade! they could have some cheaper model..

Mine is scealed, aerospace/inductrial grade.. this is not a must..

if it become too dificult to get a 3PDT relay, you could get 2 3PST relay that you connect contact in serie.. i'll explain..

Steveo.. do you understant these P D and T terms?.. I just want to ensure i'm not confusing you :wink:

Doc

 

[rkosiorek]

steveo,

easiest way to measure the winding resistance is pretty much the same way as measuring the internal shunt resistance. use a couple of "D" batteries a series resistor to limit current and a voltmeter.

a basic explanation of the method is:
http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=10166#p156637

rick