Q&A Forum
Hi,
I begin to collect info to built my own pods dyno.
I would like to know if their any difference on performance between power supply option available (sportdevice, semikron, nuwave)
I currently have find 2 Telma brake (12v, 8coils, 0.4 ohm per coil) That will bring me to 31amp draw per pod at 96V, so the sportdevices powersuply would be not strong enought
Did someone have a detailed power supply parts list for semikron or nuwave setup?
Thanks
Patrick
I'm pretty sure sportsdevices has high amperage rates avaliable on request if my memory is correct i read it on one of their webpages.
I have send them an email about my application and here are the reply:
Hello
My email I sent:
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| Message | Hi,
I am in the process to build an hub dyno (2pods). I have find 2 Telma brake (12v/8 coils/0.39ohm per coil) Can a pair of your HS-PWS power suply set to 100V / 29A would work for that application? By my calcul it will be at 30.76A draw per pods if not do you make something that can handle those brake Amp draw ? Thanks |
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Here are the answer about the high amperage unit:
yes, we have a version of PWS1.5 for 40A which is based on thyristors (SCR) instead of IGBT, it has an older design, with more analog parts and is not as fast as HS-PWS, but it works good.
Well one can use a big finned aluminium heat sink block with fans to dissipate the heat. Away from circuit boards and other components.
What vehicles "engine size hp/torque/rpm " do you mainly plan to test ?
With a hub dyno you have 2 retards as opposed to most chassis dynos having one retarder.
My drag racing car as actually ~1200hp/1000lb-ft
The two brakes that I have find are Telma AD 72-45 rated a 1800lb-ft each at 500rpm and 1300lb-ft at 3000rpm (max rpm
As I calculated it should work for my hub dyno application (please let me know if am wrong) 🙂
What RPM is maximum engine horsepower ("1200 BHp"), transmission and differential ratio ?
The max power is at 7000-7500rpm on a GM TH400 with a 3.73 rear ratio
Ok, 1200 hp @ 7500 rpm and producing holding high torque of 1000lb-ft , sounds like it is turbo charged ( or super charged )
Have you already purchased the two (2) Telma AD 72-45 retarders ?
A better choice of telma retarder would be two (2) Telma CC200. which will enable you to run them on 192Vots and around 20 amps when you configure the sixteen coils to run on 192Volts and less amps.
Telma CC200 is rated at max torque 2200 Nm ( 1474 ftlb )@max 4000 RPM.
As opposed to the Telma AD 72-45 which has only eight (8) coils and requires more amperage.
There are other brands of electric brakes to consider also.
I will post a link on here hope it works maybe this will give you some information , this has been posted already on this forum.
I think I will give a try to the AD 72-45. The price is good and not far from here
I will go with SportDevice PWS1.5 power supply they are rated at 40A max at 100V. They are supposedly little slower than PWS3.2 but hope that will work great 🙂
Can a 12v, 8coils, 0.4 ohm per coil can be rewired to 192V this way ?
Can a 12v, 8coils, 0.4 ohm per coil can be rewired to 192V this way ?
You will require 60 amps to run it on 8 coils ( NICE AND HOT) , do you have 80 amps fuse box out the front of your house/workshop ? I'm guessing USA mains electricity 120 Volts AC @ 60Hz or 240 Volts AC @ 60 Hz??? which one ????
Plug some figures into that "brake-chassis-dyno-design-tool-v3-1.xls" I posted and do the calculations. I think you will find that the AD 72-45. will be on their limits in regards to the retarder speed rating for a axle_hub dynamometer application, specially when running them in top gear TH400 @3,73:1 diff ratio