[ausev] Electric AC maintaining cool in a Civic
Dan Petit
dan-petit at att.net
Thu Feb 12 01:13:58 GMT 2009
ausev-request at austinev.org wrote:
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> Today's Topics:
>
> 1. Re: AusEV Digest, Vol 37, Issue 8 (William Gooch)
> 2. Re: AusEV Digest, Vol 37, Issue 8 (William Gooch)
> 3. Re: Progress so far on 91 MR2 conversion, and a question
> (Brian Lasseter)
> 4. Re: AusEV Digest, Vol 37, Issue 8 (Brian Lasseter)
> 5. Re: AusEV Digest, Vol 37, Issue 8 (Brian Lasseter)
> 6. Re: AusEV Digest, Vol 37, Issue 8 (Aaron Choate)
> 7. Re: AusEV Digest, Vol 37, Issue 8 (Aaron Choate)
> 8. Re: Transmissions (Jim Watson)
> 9. Re: Transmissions (Ken Thomas)
> 10. Re: AusEV Digest, Vol 37, Issue 8 (Gil Dawson)
> 11. Re: Honda's Electric A/C Compressor (Dan Petit)
> 12. Re: AusEV Digest, Vol 37, Issue 8 (Brian Lasseter)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 10 Feb 2009 07:48:58 -0600
> From: William Gooch <goochb at alum.mit.edu>
> Subject: Re: [ausev] AusEV Digest, Vol 37, Issue 8
> To: ausev at austinev.org, blasseter.cmpe01 at gtalumni.org
> Message-ID: <499185CA.2080808 at alum.mit.edu>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Brian,
>
> Thanks very much for the info. Which model Masterflux did you get, and
> how big and heavy is it?
>
> I'll follow up with Aaron.
>
> Bill
>
> ausev-request at austinev.org wrot
>
>> Date: Mon, 9 Feb 2009 15:18:40 -0600
>> From: Brian Lasseter <blasseter.cmpe01 at gtalumni.org>
>> Subject: Re: [ausev] Progress so far on 91 MR2 conversion, and a
>> question
>>
>> A "small 12VDC" motor will never drive your A/C compressor. Aaron
>> Choate, Mark Farver, and Chris Robison could give you more
>> information, but we basically tried to hook up a 3HP 144VDC motor to
>> my A/C compressor, and it burned out the motor (after working for a
>> few minutes).
>>
>> Mark Farver also tried a smaller high voltage DC motor on his MR2 A/C
>> compressor to disappointing results. You would need at least a 3HP
>> high voltage motor to make it work.
>>
>> I ended up buying a Masterflux high voltage DC compressor
>> http://www.masterflux.com/products/sierra/ The Masterflux compressor
>> is reliable, and works great. I've had mine for 6 months or so now.
>> They are a bit pricey though since they are essentially selling a
>> tuned scroll compressor, a high voltage three phase electric motor,
>> and a high voltage motor controller together in a kit.
>>
>> If you email Aaron Choate... he's a distributor for Masterflux and can
>> quote you recent prices. (Or you could talk to him at the AustinEV
>> meeting.)
>>
>>
>> TTFN,
>> Brian "Lasso" Lasseter
>>
>> "No Sane man will dance." -Cicero (106-43 B.C.
>>
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> ------------------------------
>
> Message: 2
> Date: Tue, 10 Feb 2009 07:55:49 -0600
> From: William Gooch <goochb at alum.mit.edu>
> Subject: Re: [ausev] AusEV Digest, Vol 37, Issue 8
> To: ausev at austinev.org
> Message-ID: <49918765.1010102 at alum.mit.edu>
> Content-Type: text/plain; charset="iso-8859-1"
>
> There's also the option of using the secondary shaft on my traction
> motor to drive the AC compressor using a belt and pulleys, much as the
> ICE motor did. I realize this has some drawbacks, but it would be
> cheaper and perhaps less trouble than adding a separate new compressor
> setup. I wonder whether it might also draw less power from the battery
> pack. What experience do folks have with this? Thanks.
>
> Bill
>
> ausev-request at austinev.org wrote:
>
>> Date: Mon, 9 Feb 2009 15:18:40 -0600
>> From: Brian Lasseter <blasseter.cmpe01 at gtalumni.org>
>> Subject: Re: [ausev] Progress so far on 91 MR2 conversion, and a
>> question
>> To: AustinEV News Announcements and General Discussion
>> <ausev at austinev.org>
>> Message-ID: <2b3d5a440902091318m6c6450n42b3c0e8cf3dc23 at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> A "small 12VDC" motor will never drive your A/C compressor....
>>
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> ------------------------------
>
> Message: 3
> Date: Tue, 10 Feb 2009 10:18:19 -0600
> From: Brian Lasseter <blasseter.cmpe01 at gtalumni.org>
> Subject: Re: [ausev] Progress so far on 91 MR2 conversion, and a
> question
> To: AustinEV News Announcements and General Discussion
> <ausev at austinev.org>
> Message-ID:
> <2b3d5a440902100818kf2538b7t3641539dd3160e42 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Mon, Feb 9, 2009 at 4:41 PM, John Flores-McLaughlin
> <johnfm101 at gmail.com> wrote:
>
>> Did you ever figure out why your motor blew?
>>
>
> It was overloaded. To be more specific, to my recollection the
> system pressure got too high, and the proper thing to do would have
> been to shut off the motor, and then cycle it back on as the pressure
> dropped. (As the car itself does.) But we didn't have the car's A/C
> controls hooked up yet, the fans were not blowing on the evaporator or
> condenser coils, the pressure sensor wasn't hooked up yet, and we were
> not watching the A/C pressure. So... the motor tried and tried to
> compress the R134a further... until the magic smoke left the motor.
>
> A proper controller to turn it on and off in regards to system
> pressure would have been needed, and I didn't have that built yet. I
> now have a small transistor controller to turn on and off the
> Masterflux A/C controller when the car's A/C pressure sensors sense a
> problem (or when I press the A/C button on the dash to turn it off).
> I would have needed a much larger version to control a high voltage DC
> motor.
>
> It was just easier and faster at the time to just buy a Masterflux A/C
> unit. That, and Revolt Custom Electric vehicles really wanted to get
> their hands on one to try out. :-)
>
>
> TTFN,
> Brian "Lasso" Lasseter
>
> "No Sane man will dance." -Cicero (106-43 B.C.)
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 10 Feb 2009 10:24:35 -0600
> From: Brian Lasseter <blasseter.cmpe01 at gtalumni.org>
> Subject: Re: [ausev] AusEV Digest, Vol 37, Issue 8
> To: AustinEV News Announcements and General Discussion
> <ausev at austinev.org>
> Message-ID:
> <2b3d5a440902100824l3a94e424i1e0d7e836e87dfe9 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Tue, Feb 10, 2009 at 7:55 AM, William Gooch <goochb at alum.mit.edu> wrote:
>
>> There's also the option of using the secondary shaft on my traction motor to
>> drive the AC compressor using a belt and pulleys, much as the ICE motor
>> did. I realize this has some drawbacks, but it would be cheaper and perhaps
>> less trouble than adding a separate new compressor setup. I wonder whether
>> it might also draw less power from the battery pack. What experience do
>> folks have with this? Thanks.
>>
>
>
> The laws of physics are quite clear on this point... you will draw
> more power from the battery pack if you try to run the A/C off of a
> secondary shaft from the traction motor due to mechanical and friction
> losses. It is most efficient for the A/C to have it's own motor
> running at that motor's most efficient speed. (This is why some
> newer luxury sedans are moving to all electric air conditioning too...
> it allows them to eek out a few more MPG for the gov't ratings.)
>
> (Besides... it very fun to be able to turn on cold A/C in a parked car.)
>
>
> TTFN,
> Brian "Lasso" Lasseter
>
> "No Sane man will dance." -Cicero (106-43 B.C.)
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 10 Feb 2009 10:34:03 -0600
> From: Brian Lasseter <blasseter.cmpe01 at gtalumni.org>
> Subject: Re: [ausev] AusEV Digest, Vol 37, Issue 8
> To: William Gooch <goochb at alum.mit.edu>
> Cc: ausev at austinev.org
> Message-ID:
> <2b3d5a440902100834k62e30401h346f1ffb11a8c05 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Tue, Feb 10, 2009 at 7:48 AM, William Gooch <goochb at alum.mit.edu> wrote:
>
>> Thanks very much for the info. Which model Masterflux did you get, and how
>> big and heavy is it?
>>
>
>
> The Masterflux pages have quite a bit of info including diagrams of
> the sizes of the parts. It's not very big, in fact it's about the
> size of my original compressor with an extra square box for the
> electronics. It weighs 15 pounds so the Masterflux page says.
>
> As for which one I have... I have the SIERRA06-0982Y3, which is the
> 150VDC to 300VDC version with the high power compressor. In hindsight
> the SIERRA05-0982Y3 would have been more appropriate. It's the 100VDC
> to 150VDC version with the high power compressor. It would have been
> more tuned to my 144VDC pack and would have allowed me to take full
> advantage of the compressor's cooling capacity. As is, my compressor
> is only at about 2/3rd of it's wattage rating... but it cools at least
> as well as the stock air conditioner... so it is not a problem worth
> my time or money to fix.
>
>
> TTFN,
> Brian "Lasso" Lasseter
>
> "No Sane man will dance." -Cicero (106-43 B.C.)
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 10 Feb 2009 10:44:26 -0600
> From: Aaron Choate <achoate at gmail.com>
> Subject: Re: [ausev] AusEV Digest, Vol 37, Issue 8
> To: AustinEV News Announcements and General Discussion
> <ausev at austinev.org>
> Cc: William Gooch <goochb at alum.mit.edu>
> Message-ID:
> <8fa91bfa0902100844r3b5037f8l7510963f09ccc04e at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Our opinion on this was and is that while the Sierra06-0982Y3 is listed on
> the site as being 150-300, it is capable of working from 130-400 in their
> docs. We recommend it for applications starting at 144 V because people who
> are making the investment in the parts for a higher voltage vehicle are
> likely to try and add additional battery capacity in the future. While it
> may be a bit less efficient in the short run, the unit gives people plenty
> of overhead to reconfigure their traction pack in the future.
> Cheers,
>
> Aaron Choate
>
>
>
> On Tue, Feb 10, 2009 at 10:34 AM, Brian Lasseter <
> blasseter.cmpe01 at gtalumni.org> wrote:
>
>
>> On Tue, Feb 10, 2009 at 7:48 AM, William Gooch <goochb at alum.mit.edu>
>> wrote:
>>
>>> Thanks very much for the info. Which model Masterflux did you get, and
>>>
>> how
>>
>>> big and heavy is it?
>>>
>> The Masterflux pages have quite a bit of info including diagrams of
>> the sizes of the parts. It's not very big, in fact it's about the
>> size of my original compressor with an extra square box for the
>> electronics. It weighs 15 pounds so the Masterflux page says.
>>
>> As for which one I have... I have the SIERRA06-0982Y3, which is the
>> 150VDC to 300VDC version with the high power compressor. In hindsight
>> the SIERRA05-0982Y3 would have been more appropriate. It's the 100VDC
>> to 150VDC version with the high power compressor. It would have been
>> more tuned to my 144VDC pack and would have allowed me to take full
>> advantage of the compressor's cooling capacity. As is, my compressor
>> is only at about 2/3rd of it's wattage rating... but it cools at least
>> as well as the stock air conditioner... so it is not a problem worth
>> my time or money to fix.
>>
>>
>> TTFN,
>> Brian "Lasso" Lasseter
>>
>> "No Sane man will dance." -Cicero (106-43 B.C.)
>> _______________________________________________
>> AusEV mailing list
>> AusEV at austinev.org
>> http://www.austinev.org/mailman/listinfo/ausev
>>
>>
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> ------------------------------
>
> Message: 7
> Date: Tue, 10 Feb 2009 10:46:45 -0600
> From: Aaron Choate <achoate at gmail.com>
> Subject: Re: [ausev] AusEV Digest, Vol 37, Issue 8
> To: AustinEV News Announcements and General Discussion
> <ausev at austinev.org>
> Message-ID:
> <8fa91bfa0902100846o52b87aecnfc38a38b1039c975 at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Guys,
> I'm going to answer William's questions off list unless anybody else is
> interested in the conversation. If you want any additional info, I am glad
> to answer questions, I just don't want to spam the list with this stuff.
>
> /Aaron
>
> On Tue, Feb 10, 2009 at 10:24 AM, Brian Lasseter <
> blasseter.cmpe01 at gtalumni.org> wrote:
>
>
>> On Tue, Feb 10, 2009 at 7:55 AM, William Gooch <goochb at alum.mit.edu>
>> wrote:
>>
>>> There's also the option of using the secondary shaft on my traction motor
>>>
>> to
>>
>>> drive the AC compressor using a belt and pulleys, much as the ICE motor
>>> did. I realize this has some drawbacks, but it would be cheaper and
>>>
>> perhaps
>>
>>> less trouble than adding a separate new compressor setup. I wonder
>>>
>> whether
>>
>>> it might also draw less power from the battery pack. What experience do
>>> folks have with this? Thanks.
>>>
>> The laws of physics are quite clear on this point... you will draw
>> more power from the battery pack if you try to run the A/C off of a
>> secondary shaft from the traction motor due to mechanical and friction
>> losses. It is most efficient for the A/C to have it's own motor
>> running at that motor's most efficient speed. (This is why some
>> newer luxury sedans are moving to all electric air conditioning too...
>> it allows them to eek out a few more MPG for the gov't ratings.)
>>
>> (Besides... it very fun to be able to turn on cold A/C in a parked car.)
>>
>>
>> TTFN,
>> Brian "Lasso" Lasseter
>>
>> "No Sane man will dance." -Cicero (106-43 B.C.)
>> _______________________________________________
>> AusEV mailing list
>> AusEV at austinev.org
>> http://www.austinev.org/mailman/listinfo/ausev
>>
>>
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> ------------------------------
>
> Message: 8
> Date: Tue, 10 Feb 2009 10:49:17 -0600
> From: Jim Watson <osious at gmail.com>
> Subject: Re: [ausev] Transmissions
> To: AustinEV News Announcements and General Discussion
> <ausev at austinev.org>
> Message-ID:
> <5abb02190902100849g59f69d29rd56d1e8b0ab05e8 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Just curious,.. What is the benefit of air shocks in Dennis Berube's "Smoke
> Screen"?
>
> Jim
>
> P.S. that is a bad ass truck!!
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> ------------------------------
>
> Message: 9
> Date: Tue, 10 Feb 2009 12:20:02 -0500
> From: Ken Thomas <kenscircus at aol.com>
> Subject: Re: [ausev] Transmissions
> To: ausev at austinev.org
> Message-ID: <8CB59BAF15B5EA8-F2C-113 at FWM-M41.sysops.aol.com>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> Hi Jim,
>
> Air shocks are great on any pickup because you can set the ride height
> with varying payloads. There are other benefits as well, but I don't
> really know the one Dennis was specifically interested in. You can ask
> him directly at: Dennis at CurrentEliminator.net. He loves his truck. I
> am sure he would love to tell you all about it.
>
> In other exciting news, NEDRA will be hosting the Wayland Invitational
> at PIR this year in July. Check it out on the NEDRA website:
> http://www.nedra.com/upcoming_events.html
>
> This should be a fantastic event. It is expected that Dennis will be
> there to face off his Smoke Screen against John's White Zombie, and
> much more!
>
> Regards,
>
> Ken
>
>
>
> -----Original Message-----
> From: Jim Watson <osious at gmail.com>
> To: AustinEV News Announcements and General Discussion
> <ausev at austinev.org>
> Sent: Tue, 10 Feb 2009 10:49 am
> Subject: Re: [ausev] Transmissions
>
>
> Just curious,.. What is the benefit of air shocks in Dennis Berube's
> "Smoke Screen"?
>
> Jim
>
> P.S. that is a bad ass truck!!
>
>
>
> _______________________________________________
> AusEV mailing list
> AusEV at austinev.org
> http://www.austinev.org/mailman/listinfo/ausev
>
>
>
> ------------------------------
>
> Message: 10
> Date: Tue, 10 Feb 2009 10:08:49 -0800
> From: Gil Dawson <Gil at Gil.Dawson.name>
> Subject: Re: [ausev] AusEV Digest, Vol 37, Issue 8
> To: AustinEV News Announcements and General Discussion
> <ausev at austinev.org>
> Message-ID: <2714E86E-E34C-48E9-8796-FA61F73532F4 at Gil.Dawson.name>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> On Feb 10, 2009, at 8:24 A, Brian Lasseter wrote:
>
>> at that motor's most efficient speed.
>>
>
> Keep in mind that the speed might vary depending upon demand. In my
> S-10E, for example, the compressor motor is synchronous and driven by
> a variable-frequency power oscillator. Rather than turn the
> compressor on and off with a thermostat to keep the temperature
> constant, the speed of the compressor is varied with the input of a
> thermocouple to keep the temperature constant.
>
>
>
> ------------------------------
>
> Message: 11
> Date: Tue, 10 Feb 2009 13:03:45 -0600
> From: Dan Petit <dan-petit at att.net>
> Subject: Re: [ausev] Honda's Electric A/C Compressor
> To: ausev at austinev.org
> Message-ID: <4991CF91.4020407 at att.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> From Dan Petit
> Honda's electric AC compressor has two modes for which the PCM
> controls both.
> A 70 cc scroll is electrically-driven and serves to "maintain" a cooled
> interior, while the
> mechanical side of the compressor is driven by belt to more quickly
> purge initial high inerior heat.
> There may be an interesting possibility with the use of a used one
> from a wrecking yard to possibly run the mechanical side off of an
> unused side of your traction motor to possibly recover energy from
> slowing down (a relay off of the brake light switch), then, a program to
> engage the 70cc electric side to maintain cooling.
> Although it was several years ago when I found out that the going price
> for a good used one was about $400, this presents a really interesting
> set of really fun possibilities.
> What is the displacement of the Magnaflux in the Saturn?
> (I was preoccupied with the charge calibration procedure to ask that.)
> Dan.
>
>
>
>
>
>> Send AusEV mailing list submissions to
>> ausev at austinev.org
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> http://www.austinev.org/mailman/listinfo/ausev
>> or, via email, send a message with subject or body 'help' to
>> ausev-request at austinev.org
>>
>> You can reach the person managing the list at
>> ausev-owner at austinev.org
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of AusEV digest..."
>>
>>
>> Today's Topics:
>>
>> 1. Progress so far on 91 MR2 conversion, and a question
>> (William Gooch)
>> 2. General Meeting this Saturday (2/14) 2:00 pm -4:30pm --
>> Terrazas Branch (Aaron Choate)
>> 3. Re: Progress so far on 91 MR2 conversion, and a question
>> (Brian Lasseter)
>> 4. Re: Progress so far on 91 MR2 conversion, and a question
>> (John Flores-McLaughlin)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Mon, 09 Feb 2009 07:49:54 -0600
>> From: William Gooch <goochb at alum.mit.edu>
>> Subject: [ausev] Progress so far on 91 MR2 conversion, and a question
>> To: ausev at austinev.org
>> Message-ID: <49903482.3090706 at alum.mit.edu>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Here are some photos from last month:
>> http://img301.imageshack.us/img301/4876/p1020416yo6.jpg
>> http://img26.imageshack.us/img26/86...70250598ip7.jpg
>> <http://img26.imageshack.us/img26/8659/p10204170250598ip7.jpg>
>>
>> And yesterday:
>> http://img13.imageshack.us/img13/50...10684240lh6.jpg
>> <http://img13.imageshack.us/img13/5070/p10204810684240lh6.jpg>
>> http://img5.imageshack.us/img5/4528...90758708aq1.jpg
>> <http://img5.imageshack.us/img5/4528/p10204790758708aq1.jpg>
>>
>> The new 9" ADC motor:
>> http://img12.imageshack.us/img12/39...40625004bj4.jpg
>> <http://img12.imageshack.us/img12/3962/p10204740625004bj4.jpg>
>>
>> The question I have is whether anyone can recommend a good choice for a
>> small 12V DC motor to drive the AC compressor. What RPM range is good
>> to use for that, etc? I'm thinking of directly coupling that motor
>> shaft to the compressor shaft, and may locate both in the small cargo
>> area up front, to shorten the AC coolant lines (the heat exchanger is
>> right in the front of the car). Thanks!
>>
>> Do we have a meeting place set for this month yet (maybe I missed it)?
>>
>> Bill
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>> ------------------------------
>>
>> Message: 2
>> Date: Mon, 9 Feb 2009 12:42:53 -0600
>> From: Aaron Choate <achoate at gmail.com>
>> Subject: [ausev] General Meeting this Saturday (2/14) 2:00 pm -4:30pm
>> -- Terrazas Branch
>> To: AustinEV News Announcements and General Discussion
>> <ausev at austinev.org>
>> Message-ID:
>> <8fa91bfa0902091042s5c96280fvdefc098aa1cba34 at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> All,
>> Sorry for not sending out this in email. The next meeting is scheduled for
>> Saturday 2/14 - 2:00-4:30pm at the Terrazas Branch of the Austin Public
>> Library.
>>
>> http://www.austinlibrary.com/library/branches/index.cfm?action=terrazas
>>
>> I will send an email in a bit once we have everything finalized with the
>> agenda, but we are sure we have a Tesla coming for a show and tell. Willie
>> is also interested in showing his car and I will confirm with him on
>> charging and the timing.
>>
>> Cheers,
>>
>> Aaron Choate
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>> ------------------------------
>>
>> Message: 3
>> Date: Mon, 9 Feb 2009 15:18:40 -0600
>> From: Brian Lasseter <blasseter.cmpe01 at gtalumni.org>
>> Subject: Re: [ausev] Progress so far on 91 MR2 conversion, and a
>> question
>> To: AustinEV News Announcements and General Discussion
>> <ausev at austinev.org>
>> Message-ID: <2b3d5a440902091318m6c6450n42b3c0e8cf3dc23 at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> A "small 12VDC" motor will never drive your A/C compressor. Aaron
>> Choate, Mark Farver, and Chris Robison could give you more
>> information, but we basically tried to hook up a 3HP 144VDC motor to
>> my A/C compressor, and it burned out the motor (after working for a
>> few minutes).
>>
>> Mark Farver also tried a smaller high voltage DC motor on his MR2 A/C
>> compressor to disappointing results. You would need at least a 3HP
>> high voltage motor to make it work.
>>
>> I ended up buying a Masterflux high voltage DC compressor
>> http://www.masterflux.com/products/sierra/ The Masterflux compressor
>> is reliable, and works great. I've had mine for 6 months or so now.
>> They are a bit pricey though since they are essentially selling a
>> tuned scroll compressor, a high voltage three phase electric motor,
>> and a high voltage motor controller together in a kit.
>>
>> If you email Aaron Choate... he's a distributor for Masterflux and can
>> quote you recent prices. (Or you could talk to him at the AustinEV
>> meeting.)
>>
>>
>> TTFN,
>> Brian "Lasso" Lasseter
>>
>> "No Sane man will dance." -Cicero (106-43 B.C.)
>>
>>
>>
>> On Mon, Feb 9, 2009 at 7:49 AM, William Gooch <goochb at alum.mit.edu> wrote:
>>
>>
>>> The question I have is whether anyone can recommend a good choice for a
>>> small 12V DC motor to drive the AC compressor. What RPM range is good to
>>> use for that, etc? I'm thinking of directly coupling that motor shaft to
>>> the compressor shaft, and may locate both in the small cargo area up front,
>>> to shorten the AC coolant lines (the heat exchanger is right in the front of
>>> the car). Thanks!
>>>
>>>
>> ------------------------------
>>
>> Message: 4
>> Date: Mon, 9 Feb 2009 16:41:16 -0600
>> From: John Flores-McLaughlin <johnfm101 at gmail.com>
>> Subject: Re: [ausev] Progress so far on 91 MR2 conversion, and a
>> question
>> To: AustinEV News Announcements and General Discussion
>> <ausev at austinev.org>
>> Message-ID:
>> <5fb85f910902091441n4f1e6a79na3e24f7d00814806 at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> Did you ever figure out why your motor blew?
>>
>> On Mon, Feb 9, 2009 at 3:18 PM, Brian Lasseter
>> <blasseter.cmpe01 at gtalumni.org> wrote:
>>
>>
>>> A "small 12VDC" motor will never drive your A/C compressor. Aaron
>>> Choate, Mark Farver, and Chris Robison could give you more
>>> information, but we basically tried to hook up a 3HP 144VDC motor to
>>> my A/C compressor, and it burned out the motor (after working for a
>>> few minutes).
>>>
>>> Mark Farver also tried a smaller high voltage DC motor on his MR2 A/C
>>> compressor to disappointing results. You would need at least a 3HP
>>> high voltage motor to make it work.
>>>
>>> I ended up buying a Masterflux high voltage DC compressor
>>> http://www.masterflux.com/products/sierra/ The Masterflux compressor
>>> is reliable, and works great. I've had mine for 6 months or so now.
>>> They are a bit pricey though since they are essentially selling a
>>> tuned scroll compressor, a high voltage three phase electric motor,
>>> and a high voltage motor controller together in a kit.
>>>
>>> If you email Aaron Choate... he's a distributor for Masterflux and can
>>> quote you recent prices. (Or you could talk to him at the AustinEV
>>> meeting.)
>>>
>>>
>>> TTFN,
>>> Brian "Lasso" Lasseter
>>>
>>> "No Sane man will dance." -Cicero (106-43 B.C.)
>>>
>>>
>>>
>>> On Mon, Feb 9, 2009 at 7:49 AM, William Gooch <goochb at alum.mit.edu> wrote:
>>>
>>>
>>>> The question I have is whether anyone can recommend a good choice for a
>>>> small 12V DC motor to drive the AC compressor. What RPM range is good to
>>>> use for that, etc? I'm thinking of directly coupling that motor shaft to
>>>> the compressor shaft, and may locate both in the small cargo area up front,
>>>> to shorten the AC coolant lines (the heat exchanger is right in the front of
>>>> the car). Thanks!
>>>>
>>>>
>>> _______________________________________________
>>> AusEV mailing list
>>> AusEV at austinev.org
>>> http://www.austinev.org/mailman/listinfo/ausev
>>>
>>>
>>>
>> ------------------------------
>>
>> _______________________________________________
>> AusEV mailing list
>> AusEV at austinev.org
>> http://www.austinev.org/mailman/listinfo/ausev
>>
>>
>> End of AusEV Digest, Vol 37, Issue 8
>> ************************************
>>
>>
>>
>
>
>
> ------------------------------
>
> Message: 12
> Date: Tue, 10 Feb 2009 13:18:27 -0600
> From: Brian Lasseter <blasseter.cmpe01 at gtalumni.org>
> Subject: Re: [ausev] AusEV Digest, Vol 37, Issue 8
> To: AustinEV News Announcements and General Discussion
> <ausev at austinev.org>
> Message-ID:
> <2b3d5a440902101118g3402788al2ce081fb8fbe76f7 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Tue, Feb 10, 2009 at 12:08 PM, Gil Dawson <Gil at gil.dawson.name> wrote:
>
>> On Feb 10, 2009, at 8:24 A, Brian Lasseter wrote:
>>
>>> at that motor's most efficient speed.
>>>
>> Keep in mind that the speed might vary depending upon demand. In my
>> S-10E, for example, the compressor motor is synchronous and driven by
>> a variable-frequency power oscillator. Rather than turn the
>> compressor on and off with a thermostat to keep the temperature
>> constant, the speed of the compressor is varied with the input of a
>> thermocouple to keep the temperature constant.
>>
>
> The Masterflux units have a variable resister as an input for the
> cooling capacity of the A/C system. Hooking up a thermister to this
> input and placing the thermister in the passenger cabin would do the
> same thing. It would adjust the speed of the compressor to match the
> need.
>
> I personally do not have such a thing hooked up in my car... but it's
> a good idea.
>
>
>
Dan Petit Wednesday Feb 11, 7:12 PM.
The reasons I believe it to be worthwhile to investigate the dual
scroll Honda Mechanical/Electric compressor is because the Mechanical
side purges the built-up heat and the electric side maintains the
comfort level. Running the mechanical side off the other side of the
traction motor momentarily will not greatly tax the pack. As well,
the opportunity for A/C regenerative braking is the more efficient use
of latent energy to slow the vehicle down. (This would offset the
slower air flow into the condenser to a great extent once the vehicle is
stopped for awhile at a traffic light.) In addition, software could
keep even the electrical side from operating at 100 percent pulse-width
during accelerations.
The design is calibrated for the interior volume of a Civic of course,
but most EV conversions are approximately the same interior volume.
Dan Petit
> Also... I can personally verify that the SIERRA06-0982Y3 units work
> well enough down to at least 110VDC. :-) (I'm not really sure if
> they even have a low voltage cutoff... )
>
>
>
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