Did realize the Prius was permanent magnet. The TECO VFD might not work
at all driving a PM. :-(
Other OEM EV compressors might not be PM. Residential HVAC compressors
are definitely not PM, but they tend to be rather bulky.
Bill D.
On 6/11/2015 11:54 AM, Joe via EV wrote:
Regarding an off-the-shelf VFD for a prius compressor, it would have to be
one that can control permanent magnet synchronous motors with interior
magnets. The TECO drive linked appears to only work in sensorless mode for
induction motors. Open loop V/f would probably make a prius compressor
spin, but probably not very efficiently or effectively at high power.
Also, I've measured up to 1500W (2 HP) drawn by the prius compressor on a
100F day with the fan on high, so the drive would have to be sized
accordingly. Looks like the 2 and 3 HP versions of the TECO drive aren't
much more expensive, though. One of those drives might work with a
residential hvac compressor.
Also, I forgot about masterflux drives and compressors. They're expensive,
but I think they work well based on some posts on diyelectriccar.
On Thu, Jun 11, 2015 at 7:03 AM, Bill Dube via EV <ev@lists.evdl.org> wrote:
"Hacking" some OEM EV air conditionaing, like from a Prius, is likely the
best option. There are also inverter driven (VFD) home compressors that
would likely work as well, but aren't as rugged as the OEM EV air
conditioning compressors.
I would investigate small, single phase input, three phase output,
variable frequency drives (VFD) instead of building my own inverter from
scratch. Like a TECO:
http://www.surpluscenter.com/Electric-Motors/3-Phase-Motors/Variable-Frequency-Drives/1-HP-TECO-VFD-115-VAC-1PH-INPUT-3PH-OUTPUT-11-3424.axd
Likely will run nicely from DC. Certainly cheap to try.
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