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Search took 0.01 seconds. Search: Posts Made By: cts_casemod
Forum: DIY / How-to 11-13-2015, 12:09 AM
Replies: 92
Views: 36,949
Posted By cts_casemod
Good question. Remember I just converted the...

Good question. Remember I just converted the electric car.
So far I get a boost of 30% on my range, assuming motorway driving. Short journey trips vary as I may be able to top up between them....
Forum: DIY / How-to 09-25-2015, 02:18 PM
Replies: 3
Views: 5,499
Posted By cts_casemod
Alternator Kill and LiFEPO4 - The definite guide

Some of you may be curious what happens when a standard lead acid battery on a diesel car is replaced with a LiFePO4 Lithium Battery...

Last year when the starter battery died (again!) I decided...
Forum: Fossil Fuel Free 08-04-2015, 01:14 PM
Replies: 12
Views: 3,514
Posted By cts_casemod
Had to byte the wallet and order two inductors...

Had to byte the wallet and order two inductors from coilws. Was hopping to get them this week, but the order is still pending. Maybe they are out of stock...

Last week I made a small prototype,...
Forum: Fossil Fuel Free 07-21-2015, 04:37 PM
Replies: 12
Views: 3,514
Posted By cts_casemod
Just to get started on this thread Ill share some...

Just to get started on this thread Ill share some of the work I've been doing:

Disclosure: My work is primarilly concerning a single stage PFC controller, as such topology is slightly different...
Forum: Fossil Fuel Free 07-21-2015, 04:17 PM
Replies: 12
Views: 3,514
Posted By cts_casemod
Boost Converter for high voltage electric vehicles

This topic is meant for discussion of a high power boost converter for electric vehicle use.

Right now two instances are proposed:
Achieve power factor correction of an AC supply, with the intent...
Forum: Fossil Fuel Free 01-20-2015, 09:26 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
They are produced by spec so we cant say for...

They are produced by spec so we cant say for sure. They provide the toroid size on this table:

http://www.traftor.com/wp-content/uploads/2014/03/Traftor-Toroidal-inductors-examples.png

The...
Forum: Fossil Fuel Free 01-19-2015, 07:15 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Had the same issue last night. Now I know it's...

Had the same issue last night. Now I know it's not on my side :thumbup:

If manage to call them tomorrow I let you know. About the same time as now.
Forum: Fossil Fuel Free 01-19-2015, 07:04 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Not sure, Ill call them tomorrow, apparently they...

Not sure, Ill call them tomorrow, apparently they have offices in France
Forum: Fossil Fuel Free 01-19-2015, 06:57 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
I found another supplier for inductors. ...

I found another supplier for inductors.

Traftor Manufacturer of Toroidal Inductors and Toroidal Transformers (http://www.traftor.com/)

This one in particular seems to suit the boost converter...
Forum: Fossil Fuel Free 01-13-2015, 08:07 AM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
You most certainly can. Im building my own test...

You most certainly can. Im building my own test inductors for my charger, but they dont come cheap and there is a lot of work involved in researching suitable cores, frequency ranges, inductances and...
Forum: Fossil Fuel Free 01-11-2015, 02:03 AM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
I found this page while looking for some...

I found this page while looking for some inductors for my charger.

Have a look at this series:

E Series : CWS Coil Winding Specialist, manufacturer of transformers, inductors, coils and chokes...
Forum: Fossil Fuel Free 01-09-2015, 05:53 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
That looks more meaningful than the 50% duty. ...

That looks more meaningful than the 50% duty.

If one was to boost accordingly to the RPM it would make the inverter software very neat. Basically the V/Hz ratio and hence torque would be pretty...
Forum: Fossil Fuel Free 01-09-2015, 11:00 AM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Correct. But in practice higher inductance is...

Correct. But in practice higher inductance is better as it allows continuous current down to a few amps and a very low ripple while under heavy use. It also allows a smaller igbt peak current. Lower...
Forum: Fossil Fuel Free 01-08-2015, 09:45 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Yes. The capacitor is initially charged to...

Yes.
The capacitor is initially charged to 20V, rather than 40, by the diode. This is where the pre-charge goes. From here the boost converter charges the output capacitor in pulse by pulse current...
Forum: Fossil Fuel Free 01-08-2015, 07:54 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Thats because most controllers are VSI (voltage...

Thats because most controllers are VSI (voltage source inverters). For an induction motor any small percentage of error on the slip angle can cause huge amounts of torque for a short duration. I had...
Forum: Fossil Fuel Free 01-08-2015, 07:24 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Cool, how much will they peak? I heard 15KW is...

Cool, how much will they peak? I heard 15KW is enough to 60MPH cruizing in a straight line, but I am curious how much acceleration they can have.

I can only tackle very step hills at 24-28MPH,...
Forum: Fossil Fuel Free 01-08-2015, 06:43 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Probably the same as a stock polo with a 33KW...

Probably the same as a stock polo with a 33KW 1Liter petrol engine. How much do people with a 500Amp DC motor pull at the highway?

Max top speed I reached was 45MPH miles on a test run in 3rd...
Forum: Fossil Fuel Free 01-08-2015, 05:07 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Yes, I think we need to design something based on...

Yes, I think we need to design something based on a real world scenario.

Technically Paul is designing this to allow 208V motors to be operated on 144V packs.

A 208V motor being operated at...
Forum: Fossil Fuel Free 01-08-2015, 11:54 AM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Slip angle, unfortunately, is not stationary as a...

Slip angle, unfortunately, is not stationary as a PMDC. One can increase slip frequency, but this is somewhat equivalent to more powerful magnets on a BLDC only. There's not a lot to know here: The...
Forum: Fossil Fuel Free 01-07-2015, 12:07 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
160% torque for 15 seconds and 200% torque for 5...

160% torque for 15 seconds and 200% torque for 5 seconds for S1 Rated motors at nominal nameplate speed and V/Hz.

For 30 seconds I would say 130% torque should be safe.

Above 90Hz one has to...
Forum: Fossil Fuel Free 01-07-2015, 01:37 AM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
If one drives a early 90's car, its perfectly...

If one drives a early 90's car, its perfectly acceptable to drive analog gauges with PWM. For the newer ones , tought, control is made digitally.
The cluster I use sends a pulse every so often...
Forum: Fossil Fuel Free 12-18-2014, 07:27 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
That's the flywheel from a 1.4/1.6L VW Polo. ...

That's the flywheel from a 1.4/1.6L VW Polo.

If memory serves me right it weights about 14KG itself and 18KG with the clutch and pressure plate installed. Add another 3KG to the crank adapter....
Forum: Fossil Fuel Free 12-14-2014, 12:09 PM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
I wrote the formulas for all that and calculated...

I wrote the formulas for all that and calculated the table below

Parameters are:
Motor nominal Voltage: 208VAC
Motor nominal Frequency: 50Hz
Motor rated Slip: 70RPM
Battery cut out voltage:...
Forum: Fossil Fuel Free 12-14-2014, 10:41 AM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Thats just what the literature tells you. But...

Thats just what the literature tells you. But from that you cant calculate the torque.

let me clarify:

Theory says that torque falls by the square of the voltage, so technically at twice the...
Forum: Fossil Fuel Free 12-14-2014, 07:13 AM
Replies: 3,480
Views: 914,881
Posted By cts_casemod
Why don't you guys use the flywheel and a...

Why don't you guys use the flywheel and a reluctance sensor as an encoder? That would cut a significant portion of the costs.

http://imageshack.us/a/img46/2420/hkkm.jpg

The input capture...
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