Hello Bill,
I install a standard face mounted auto A/C unit in my EV that does not run
off the main battery pack or any accessory power. It runs off the kinetic
energy of the main motor when the main motor is not energized by the main
battery pack.
This works good in a area where you have roller coaster hills, rather then
constant flat level driving. If you do a lot of coast, stop and go, this
method can also work.
I also have a backup electric motors that will run off the main battery
pack. This is directly belted to the main multi-groove drive pulley which
is then belted to the standard air condition electric clutch which cycle's
on and off depending on the demand.
Just use a golf type motor with it controller. I tested them system with
three thread mill motors gang together using four Iota's DC-DC converters
that were series-parallel together to give me any combination of 120 to 480
vac in and 14.5 to 58 volts out, which could run these motors from 1500 to
3000 rpm which is about the right rpm for the A/C unit.
The main drive pulley is also driven by the pilot shaft of the main motor
which can engage and disengaged by use of a large A/C electric clutch that
is attach to the shaft of the main drive pulley.
So far, I have not use the electric motors to drive the A/C unit, only the
kinetic energy of the main motor. Every time, that I am on a down hill run,
I let up on the accelerator, this turns on a micro-switch on the accelerator
control unit which turns on a 12 volt power relay, which turns on the 12
volt A/C control power to the A/C relays that control the high and low limit
switches for the A/C.
Even at times, when this 12 volt circuit turns on, the A/C clutch may not
come on, because the A/C demand for cooling may not come on during my down
hill runs.
I use a summer-winter switch where this same type of operation works for the
electric heating or the A/C. The electric heating also do not use main
battery power directly. It is power by a rotating combination
inverter-alternator that can supply 13.5 to 16 volts at 145 amps and at the
same time provide 110 VDC 7KW which is inverted to 130 VAC 60 cycle 5KW
which is use to run 120 vac heaters, pumps, and fans.
This system provides a regenerative type of braking on my down hill runs
which can hold the EV down in speeds. The EV could get up to over 80 mph if
some type of braking is not use which I did one time on a glare ice.
Roland
Roland
----- Original Message -----
From: "Bill Ferguson" <
[hidden email]>
To: "EV" <
[hidden email]>
Sent: Friday, July 03, 2009 8:30 PM
Subject: [EVDL] How to do air conditioning? or 300VDC motor?
> EV experts,
>
> Has anyone put air conditioning in their EV conversion? If so, how
> did you do it or how would you do it?
>
> It seems the easiest way would be to add a small electric motor to
> power the existing air conditioner compressor, but I'm having trouble
> finding one that would work. I need a high quality, professional
> looking/performing solution, because we plan to sell the car.
>
> Does anyone know where I could buy a small electric motor that will
> run off 300V DC? It could be either brushless or with brushes, one
> hp. RPM could be 2,000 to 8000 rpm. I don't know if anyone makes a
> motor like this.
>
> I'm with a small group that is making our first electric car. We have
> a 2001 Honda Civic, have removed the gas motor and will be putting in
> an AC motor, controller, lithium-ion batteries and other electronics.
>
> We need a DC motor to run the air conditioner. Our battery pack is 96
> cells at 3.2 V each, so our battery pack will be 308 V. We have to
> have high voltage, in order to provide enough power to the AC motor.
> We can't run it off 12V, because it would take too much current from
> our DC/DC converter.
>
> Does anyone know a company or a brand that sells a small, electric,
> off-the-shelf, DC motor, along with the controller, that is powered
> by 300V DC? I found one company, Anaheim Automation, but they don't
> have a controller/driver for 300VDC.
>
> I see one or 2 companies sell a complete AC compressor, such as Cool
> Blue, but it's AC, so their plan to buy both the compressor and and
> inverter makes it more expensive and more complicated.
>
> Any ideas on a good solution would be appreciated.
>
> Thank you,
> Bill Ferguson
> eeVee Motors
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