how does the electric a/c compressor work? - Toyota Prius Forum : Prius Online Toyota Forums
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post #1 of 16 (permalink) Old 01-30-2007, 12:28 AM Thread Starter
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Default how does the electric a/c compressor work?

How many volts does it operate at?
Is it ac or dc voltage?
If ac, is it 60Hz?
How many amps does it draw?
What are the parameters for its speed control?
I'm just trying to determine if I can use it in other applications.

thanks.
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post #2 of 16 (permalink) Old 01-30-2007, 01:10 AM
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It is driven through DC(201.6V)-AC(3 phase) inverter (variable frequency).
Please refer to following article.
http://www.epa.gov/cppd/Presentations/M ... verter.pdf

Ken@Japan
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post #3 of 16 (permalink) Old 01-30-2007, 01:14 AM
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206 Volts AC nominally. It uses whatever voltage the battery provides, which varies relative to charge.
It is a 3 phase syncronous motor, modulated by the inverter based on control from the HV ECU. The frequency is relative to the desired speed of the compressor. MG1 and MG2 work the same way, except they operate at a nominal 500V.

The speed it is set to is determined by cooling or dehumidifying demand as determined by the Air Conditioning ECU (also known as AC Amplifier). Inputs include cabin temp, cabin humidity, outside temp, solar radiation detected, and your desired feels like temp.
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post #4 of 16 (permalink) Old 01-30-2007, 12:09 PM
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Accolades to DanMan.!!! I've been curious about the technical operating details of the Prius AC unit and thanks to DanMan, now I know.

THANKS

♫ Charles Suitt ♪ Dallas TX ♫
2007 Driftwood Pearl - Touring
∞ Package 6 - Option A ∞

Previous Prius: 2004 Package 8
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post #5 of 16 (permalink) Old 01-30-2007, 12:38 PM
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I am sure I have given these details in bits and pieces.

If not, why didn't you ask? You could have found out 2 years ago!
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post #6 of 16 (permalink) Old 01-31-2007, 05:55 PM
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Hi, Dan... Actually, my 'curiosity' was not of such proportion to cause me to make a specific inquiry. I was satisfied that it worked well and helped keep my "cool" maintained. Even after more than two years and two different Prius, I still find the Prius engineering remarkable.

Your detailed knowledge of the Prius technology is a valuable asset to PriusOnline forum members.

THANKS again
Charles

♫ Charles Suitt ♪ Dallas TX ♫
2007 Driftwood Pearl - Touring
∞ Package 6 - Option A ∞

Previous Prius: 2004 Package 8
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post #7 of 16 (permalink) Old 08-17-2007, 04:50 PM
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Default Any idea where I could find this info Dan ?

I would like to run this AC using a homemade inverter, but have to know how the AC works ? Which of the 3 connectors is what ?

Does the Nippon Denso ES18C scroll compressor runs on 206V AC ?

sincerely,
Hannes

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Originally Posted by DanMan32
206 Volts AC nominally. It uses whatever voltage the battery provides, which varies relative to charge.
It is a 3 phase syncronous motor, modulated by the inverter based on control from the HV ECU. The frequency is relative to the desired speed of the compressor. MG1 and MG2 work the same way, except they operate at a nominal 500V.

The speed it is set to is determined by cooling or dehumidifying demand as determined by the Air Conditioning ECU (also known as AC Amplifier). Inputs include cabin temp, cabin humidity, outside temp, solar radiation detected, and your desired feels like temp.
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post #8 of 16 (permalink) Old 08-19-2007, 07:08 PM
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Three phase syncronous AC, similar to MG1 and MG2 (but different voltage of course).
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post #9 of 16 (permalink) Old 03-06-2008, 07:57 PM
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Default Re: how does the electric a/c compressor work?

Hi,

Can anyone tell if the electric compressor and be fitted to a non hybrid car? if so what would I require to get it to work? Are there any wiring diagrams available?
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post #10 of 16 (permalink) Old 03-08-2008, 02:47 PM
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Default Re: how does the electric a/c compressor work?

You would need the compressor (of course), the inverter which has the drive transistors to do the actual modulation of the 206V, and then the HV ECU to control the drive transistors.
Then of course you would also need the AC amplifier which would take the input signals, then tell the HV ECU what it needs out of the compressor.

As I stated before, the AC compressor system is almost as complex as the drive for MG1 and MG2. Only difference is that if memory serves me, there are no position sensors on the AC compressor motor as there are in MG1 and MG2.
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