Date: Fri, 24 Jul 2015 22:24:44 -0400
Reply-To: KIM BRENNAN <kimbrennan@MAC.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: KIM BRENNAN <kimbrennan@MAC.COM>
Subject: Re: Electric Power Steering
In-Reply-To: <BAY405-EAS3570E7A1141965D90386F5AA0800@phx.gbl>
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At the 360 volts. That is, of course on full AC. On Eco setting it draws considerably less.
> On Jul 24, 2015, at 8:23 PM, Dennis Haynes <d23haynes57@HOTMAIL.COM> wrote:
>
> Is that 30 amps at 12 volts (360 watts) or 30 amps at up to the 360 volts
> (10,800 watts) available for the drive controllers? The later would be good
> for an awful lot of cooling.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> kimbrennan@mac.com
> Sent: Friday, July 24, 2015 7:46 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Electric Power Steering
>
> Chevy Volt AC draws 30 amps. Got that from the mechanic at the dealer.
>
> Sent from my iPad
>
>> On Jul 23, 2015, at 9:52 PM, James <jk_eaton@HOTMAIL.COM> wrote:
>>
>> I too am intrigued by the idea of running the AC with an electrically
> driven compressor. Dennis's note about the Vanagon AC compressor needing
> two or three horsepower to run shows how far AC has come - 10,000 BTU home
> units (which I expect are close to what the Vanagon unit is) now have
> compressors that draw only 600 watts, or less than one horsepower - about 50
> amps. It would be interesting to know how many watts the heat pump (AC and
> heat) in the Prius uses - though it's cooling a smaller volume than a
> Vanagon.
>>
>> James
>> Ottawa, ON
>>
>>> Date: Thu, 23 Jul 2015 19:38:14 -0400
>>> From: d23haynes57@HOTMAIL.COM
>>> Subject: Re: Electric Power Steering
>>> To: vanagon@GERRY.VANAGON.COM
>>>
>>> Hydraulic power steering has a continuous parasitic load even when not
> loaded. The need for p0wer steering assist is intermittent so going to an
> electric system makes a lot of sense. Electric water pumps are not just used
> to reduce engine load. A water pump has a limited range where it is
> efficient. Designed to pump at low speeds it will just become a mixer at
> higher speeds. Generally they spin at close to 1.5 to 2 times engine speed.
> What works at idle will not works as well at 16,000 rpm. Also for pump
> losses doubling the speed takes 4 times the power. Turn a pump fast enough
> and push enough water and you can actually add heat to the water. This is
> how many low end hot tubs heat the water, just pump it, no elements needed.
> As for an electric compressor this too is now common especially in electric
> and hybrid vehicles. For the Vanagon the compressor can probably take around
> 2 to 3 hp. At 746 watts/HP that is 2,236 watts. At 12 volts that 186.5 amps.
> Add the inefficiencies of using an alternator, (that fan removes a lot of
> heat) and you may need 4 to 5 hp to make the 3 the compressor is using. Add
> the fans and the vehicles other electrical requirements and you need a 250
> to 300 amp alternator.
>>>
>>> Just some thoughts,
>>> Dennis
>>>
>>>
>>> -----Original Message-----
>>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of Todd Last
>>> Sent: Thursday, July 23, 2015 6:57 PM
>>> To: vanagon@GERRY.VANAGON.COM
>>> Subject: Re: Electric Power Steering
>>>
>>> The new Mini Coopers have electric power steering. (They are often cited
> for noise and require a fan to keep the motor from overheating.) Racers
> have used electric water pump drives to squeeze out the last ounce of
> horsepower from their engines. So why not electrically drive the water pump
> and power steering ? Just think, you could add a speed control for the water
> pump - have it pump based on the water temperature, not the engine RPM. The
> equation to figure out is if it costs more in drag on the alternator to
> generate the power needed to run the electric motor than you gain by not
> turning the pump with the fanbelt. That would make for an interesting
> experiment. Perhaps it would be worth running the A/C compressor on an
> electric motor drive....
>>>
>>> Todd
>>> '88 Westy
>>>
>>>
>>> ----- Original Message -----
>>>
>>> From: "Alistair Bell" <albell@SHAW.CA>
>>> To: vanagon@GERRY.VANAGON.COM
>>> Sent: Thursday, July 23, 2015 11:58:12 AM
>>> Subject: Re: Electric Power Steering
>>>
>>> Yes, the UK guys have been doing it (Germans too).
>>>
>>> What I liked about the one I saw was how inexpensive it seemed to be.
>>>
>>> Alistair
>>>
>>>
>>>
>>>> On Jul 23, 2015, at 10:16 AM, Neil N <musomuso@GMAIL.COM> wrote:
>>>>
>>>> http://www.ultimate-engineering.co.uk/powersteering.html
>>>>
>>>> and....
>>>>
>>>>
> http://www.thesamba.com/vw/forum/viewtopic.php?p=7150246&highlight=nsk+japan
> +famous+bearing+eps+manufactured++corsa++late+2000#7150246
>>>>
>>>> --
>>>> Neil n
>>>>
>>>> Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca>
>>>>
>>>> 1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy>
>>>>
>>>> 1981 Westfalia "Jaco" Images, technical
> <http://tubaneil.googlepages.com/>
>>>>
>>>> Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>
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