Search found 121 matches

by T2
Tue, 12 Jun 2012, 07:20
Forum: Technical and conversion discussion
Topic: How to convert a hybrid
Replies: 132
Views: 26765

How to convert a hybrid

- Coulomb You have opened rebuttal on so many fronts that I don't have a lot of time to answer but I'll try. First glad you caught that two pole/four pole error, we all have those moments ! I should point out since the phases are in 120 deg seperation the interphase voltage needs to be multiplied by...
by T2
Sun, 10 Jun 2012, 16:41
Forum: Technical and conversion discussion
Topic: How to convert a hybrid
Replies: 132
Views: 26765

How to convert a hybrid

PART ONE How to convert a hybrid : From what I have learned over the years I would recommend as best practice for an electric transmission to be a 10krpm motor working into a 10:1 gearbox to provide 100Km/hr. I would add the proviso that the motor V/Hz must not be compromised below around 6600 rpm....
by T2
Sun, 10 Jun 2012, 09:20
Forum: Electric motors and controllers
Topic: RX400H transaxle
Replies: 169
Views: 27078

RX400H transaxle

I am going to move my posts to the Technical and Conversion area "How to convert a Hybrid" discussion Originally PlanB queried "why they went for a 650v winding on a 288v battery pack" and I wanted to make him aware of the Upconverter which is located in the (PEM) power electronics module together w...
by T2
Sat, 09 Jun 2012, 11:16
Forum: Electric motors and controllers
Topic: RX400H transaxle
Replies: 169
Views: 27078

RX400H transaxle

Well, base speed might be low, but you'd be getting lots of torque up to 20mph! :) but that's only IF you run from 360Vdc. Which I interpret to the answer of my original question as a NO. However some of your target audience, and that includes myself sitting on the fence right now, may not wish to ...
by T2
Fri, 08 Jun 2012, 13:42
Forum: Electric motors and controllers
Topic: RX400H transaxle
Replies: 169
Views: 27078

RX400H transaxle

- T_J I went on the SEW EURODRIVE website this afternoon to examine the DRE 132MC4 specs since you mentioned it. I realize this motor is intended for another application but I was pretty sure you wouldn't have it in stock form either. For the benefit of other readers who may be interested this motor...
by T2
Fri, 08 Jun 2012, 08:34
Forum: Electric motors and controllers
Topic: RX400H transaxle
Replies: 169
Views: 27078

RX400H transaxle

breakdown torque is *irrelevant* when you're running from a VFD. Unfortunately that torque value is the only figure that is publicly available to provide an indication of the outer reaches of the performance envelope. As you are aware for automotive designs we need that overcurrent information more...
by T2
Thu, 07 Jun 2012, 17:49
Forum: Electric motors and controllers
Topic: RX400H transaxle
Replies: 169
Views: 27078

RX400H transaxle

- PlanB    I don't have the where with all to rejig Prius transmissions, - Coulomb Also, I suspect that it won't be all that convenient to connect a large motor where MG1 was, but I haven't considered the details. The general consensus is fitting the motor could be tricky - but isn't the adapter pl...
by T2
Wed, 06 Jun 2012, 09:53
Forum: Technical and conversion discussion
Topic: How to convert a hybrid
Replies: 132
Views: 26765

How to convert a hybrid

I'll come back to the maximum planet gear rotational speed in a later post @Coulomb Then I'll be all ears, as they say. But seriously the difference with one less tooth on the planet gear is not going to be overwhelming to its rotational speed. Furthermore I'm sure you'll agree that this will not a...
by T2
Tue, 05 Jun 2012, 09:10
Forum: Electric motors and controllers
Topic: RX400H transaxle
Replies: 169
Views: 27078

RX400H transaxle

I've since read the front end of this thread more thoroughly and need to redo my previous post. "AC24LS/AT1200 was no good for 1600kg cars" Complaints about 100N-m into 10 : 1 ? AS a matter of interest back in the day, each of the Impact's (prototype vehicle for the EV1) front wheel motors generated...
by T2
Mon, 04 Jun 2012, 14:48
Forum: Electric motors and controllers
Topic: RX400H transaxle
Replies: 169
Views: 27078

RX400H transaxle

AC24LS/AT1200 was no good for 1600kg cars Azure Dynamics now in receivership they went for a 650v winding on a 288v battery pack Are we talking Lexus? Until the arrival of the 2004 Prius the inverter bus was tied to the 273Vdc battery which explains the anaemic performance of previous Prii. With th...
by T2
Sun, 03 Jun 2012, 14:31
Forum: Technical and conversion discussion
Topic: How to convert a hybrid
Replies: 132
Views: 26765

How to convert a hybrid

@ Coulomb a couple of errors in your post. First I think the planet gears should be 24 teeth. The pitch circles of all the contacting gears should be tangential. In which case if we are agreed the sun is 30t and the ring is 78t. Then the sun plus twice the planet must equal the ring. The only geomet...
by T2
Mon, 25 Apr 2011, 17:14
Forum: Electric motors and controllers
Topic: ADC/Curtis-reduced torque at start up?
Replies: 21
Views: 5438

ADC/Curtis-reduced torque at start up?

Thanks for corroborating my suggestion T_J, and yes I agree 50% duty cycle is absolute worst case but mentioning that might spoil the good story I had going !! If my experience is in question, I have seen only the one beer can size go OC and it was in a group of four. The caps were not potted and we...
by T2
Sun, 24 Apr 2011, 20:26
Forum: Electric motors and controllers
Topic: ADC/Curtis-reduced torque at start up?
Replies: 21
Views: 5438

ADC/Curtis-reduced torque at start up?

I would be interested to see what your DC voltage bus looks like at low speed. It would seem that the main caps may be drying up. Sometimes one capacitor will "let go" simply by going open circuit. Let us say your PWM output is on a 10khz carrier i.e. 100 musec period. Then at 10% output voltage th...
by T2
Thu, 24 Mar 2011, 22:02
Forum: General EV Discussion
Topic: Fuji variable speed drive any good?
Replies: 26
Views: 4979

Fuji variable speed drive any good?


Seems I gave up too early. Got a callback soon after and we've been in talks.

Maybe will start a new thread on this as things develop.
by T2
Sat, 12 Mar 2011, 14:15
Forum: General EV Discussion
Topic: Fuji variable speed drive any good?
Replies: 26
Views: 4979

Fuji variable speed drive any good?

Well I've phoned the office twice and he's always just "stepped out" My e-mail is on his desk. I can do no more. I am done here with this. Perhaps if you have to ask how much ? suggests you can't afford it ! Copper and thin lams are all very well but a rewind on a 60Hz stator should be satisfactory ...
by T2
Thu, 10 Mar 2011, 16:22
Forum: General EV Discussion
Topic: Fuji variable speed drive any good?
Replies: 26
Views: 4979

Fuji variable speed drive any good?

   LOL, Richo you are ON !! I e-mailed 400Hz.net earlier this week regarding the pricing of any machine they may have available in an approx L184 frame size, although I had considered doing a rewind locally. I briefly stated that the application required a machine with a 0.5V/Hz spec with constant ...
by T2
Wed, 09 Mar 2011, 10:52
Forum: General EV Discussion
Topic: Fuji variable speed drive any good?
Replies: 26
Views: 4979

Fuji variable speed drive any good?

Hey Richo, Don't be apologising for me - I didn't hijack the thread. The OP specifically stated Any comments appreciated . And I answered directly that there are better ways to go. If you are going to lay out $2000 + I would look at Curtis they do a range that will allow you to use 144Vdc battery su...
by T2
Fri, 25 Feb 2011, 13:26
Forum: Technical and conversion discussion
Topic: TIM600 Explosion
Replies: 80
Views: 19363

TIM600 Explosion

It certainly looks like it would be useful if manufacturers were to specify pole pairs on the motor name plate, furthermore with the use of non standard stator windings it would helpful if V/Hz for nominal current was published and perhaps also for twice nominal current since we need to know what ou...
by T2
Tue, 01 Feb 2011, 12:46
Forum: General EV Discussion
Topic: Fuji variable speed drive any good?
Replies: 26
Views: 4979

Fuji variable speed drive any good?

Let me do a friendly rebuttal to your comments here, and put this industrial equipment to be or not to be thread to rest. I think I have mentioned twice that an integral gear reducer with a 10:1 gear ratio is in the process of construction. This gear reducer will mount directly to, and be concentric...
by T2
Mon, 31 Jan 2011, 14:34
Forum: General EV Discussion
Topic: Fuji variable speed drive any good?
Replies: 26
Views: 4979

Fuji variable speed drive any good?

Jan 30 2011 #2 Your mention of an 11.7Kw drive reminded me that last year I walked away from an FX-8500 servo drive complete with all encoder and communication cables intact plus the 15Hp motor of course. From internal markings we saw it was of 1999 vintage which explains why the procured interface ...
by T2
Mon, 31 Jan 2011, 11:06
Forum: General EV Discussion
Topic: Fuji variable speed drive any good?
Replies: 26
Views: 4979

Fuji variable speed drive any good?

I think we are on the same page as regards the usefulness of a rectangular power profile as opposed to the triangular. My industrial experience has been with (DC) drive salesmen who needed some prodding to get them to accept field weakening. They would attempt to get you to purchase the next torque ...
by T2
Fri, 28 Jan 2011, 20:14
Forum: General EV Discussion
Topic: Fuji variable speed drive any good?
Replies: 26
Views: 4979

Fuji variable speed drive any good?

If you are going to lay out $2000 + I would look at Curtis they do a range that will allow you to use 144Vdc battery supply. IMO 300Vdc supplies and above are somewhat daunting for a noobie and need an experienced user. Those previous comments obviously came from experienced users of course. Success...
by T2
Thu, 01 Jul 2010, 15:33
Forum: Electric motors and controllers
Topic: Brilliant Honda motor and gearbox combo
Replies: 6
Views: 2004

Brilliant Honda motor and gearbox combo

At first sight this seems quite an elegant single motor solution, if you can close your eyes to the overhang (side load) presented by the take-off gear to the motor pinion under full torque, considering the rpms involved. There has been criticism regarding the practicality of using motor rpms appro...
by T2
Tue, 29 Jun 2010, 12:02
Forum: General EV Discussion
Topic: 2 Speed Gearbox
Replies: 309
Views: 57388

2 Speed Gearbox

Hi EV2Go, I see where you're headed. I have a cheap electrical solution that you may not have thought of. How did this get to 12 pages you ponder ? Well the brain is a strange thing. In general when we set out on a course of action we believe in, we are really not looking for advice. We are in fact...
by T2
Fri, 18 Jun 2010, 15:32
Forum: General EV Discussion
Topic: 2 Speed Gearbox
Replies: 309
Views: 57388

2 Speed Gearbox

Landrover transfer case ? Pancake motors ? Look, all these alternative suggestions are diversions away from looking at the real problem. The REAL problem being the lack of torque at the low end of the RPM range. To say that a two stage gear box is the better choice compared to the purchase of a high...