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Auto AC compressor rotation speed

hpknoxtn on Fri July 12, 2013 4:57 PM User is offline

Year: 2009
Make: Toyota
Model: Corolla
Country of Origin: United States

Dear this forum friends,
I have a special application in which a whole auto AC unit will be installed on a device and will be driven by an electric motor, I want to know what is the rotation rate (how many turn/rotation per minute) of the compressor in a normal working condition, so I can get the right motor to drive the compressor. At this time, I intend to use smart car fortwo 2008 ( I have the compressor) or toyota corolla 2009 (I have the compressor) AC unit. But other model car AC unit may be used also, I think that the rotation rate of those car compressors should be similar.
IF you have such information, please reply to my query.
I really appreciate your great help.

Peter

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Peter Pan

Cussboy on Fri July 12, 2013 7:31 PM User is offline

Wow, Einstein is asking for help !

Would this not be like the ratio of the AC pulley circumference (or diameter) to the circumference (or diameter) of the crankshaft pulley?

Like if the engine is running at 2000 rpm and the crankshaft pulley is twice that of AC pulley, the AC pulley would rotate twice for each revolution of the crankshaft pulley, so in that case 4000 rpm?

iceman2555 on Fri July 12, 2013 9:13 PM User is offlineView users profile

The other 'ice' might be more adapt at assisting with compressor speed. However, there is another issue that needs to be taken into consideration. What method are you using to prevent evaporator freeze up and proper compressor operation. The compressor for this vehicle is a Denso 6SEU14C. This is a constant operation/non clutched AC compressor. It is a variable displacement constant operation compressor. Operates 24/7/365. AC operation control to disable the AC mode simply places the compressor in a 'neutral swash' position, however, the compressor continues to rotate.
The OE unit utilizes several sensors with a data feed to the BCM/AC control module to control compressor output by varying the swash plate position. Wonder how or what method will be used to maintain compressor operation/AC system operation.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

hpknoxtn on Fri July 19, 2013 12:41 PM User is offline

Thanks to all your replies. If the rpm meter reading is the rotation rate of the crankshaft pulley of the engine, then, Cussboy is right. This implies that the auto AC compressor does not operate (rotate) in a stable condition, I mean, the engine rate range is from 1000 rpm to 5000 rpm, and the AC compressor will be from 2000 rpm to 10000 rpm (assume pulley size ratio is 2:1).
preventing evaporator freeze up has been taken care of in this special application. The only thing worried is the proper motor to be used.

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Peter Pan

iceman2555 on Fri July 19, 2013 1:50 PM User is offlineView users profile

What protection is build into the system for excessive discharge pressures....possible low charge conditions or over charge conditions. Mind sharing how the evap freeze up condition was addressed? Would be interesting to know. Also what procedures would be used to modify compressor displacement or control vale operations?

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

NickD on Fri July 19, 2013 2:52 PM User is offline

In my Toyota with a 6" diameter crankshaft pulley driving a 5" compressor pulley and a test specification of 2,000 engine rpm. Speed of the compressor is 2,400 rpm, but have seen many other Japanese running a 1:1 ratio.

If this motor is 120/240 VAC, would practically recommend getting refrigerant compressor like from a refrigerator or an AC unit for far superior efficiency. That belt loss is high like over 20% and with a sump, not pumping oil as used in MVAC applications. Plus a far more compact unit with no belt guard requirement. These compressors are available for R-12, R-134a, R-22, or R-410a giving you a wide range of choices.

Can even add service ports, no law that says you have to weld everything tight, only reason they do that is to save a buck.

But you didn't ask for this extra information, so just ignore it.

Ha, don't get me started on Einstein. If these idiots that teach physics, and knew anything about GPS or Loran C, would know that two beams of electromagnetic energy approach each other at twice the speed of light. If they knew anything about precision radar, the gravitation effects electromagnetic radiation and has to be compensated for in long range radar applications. If they knew anything about video, there is a delay due to transmission, these are images, so are only fooled by time standing still. But still have to go along with them as a student, can't argue, do have the power to flunk you. e=mc^2 is okay.

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