BMW I01 Product Information page 140

I01￿High-voltage￿Components
7.￿EKK
Discs￿with￿spiral￿profile
Index
1
2
3
The￿inner￿disc￿with￿spiral￿profile￿is￿driven￿via￿a￿shaft￿by￿the￿three-phase￿current￿synchronous￿motor
and￿rotates￿eccentrically.￿The￿gaseous￿refrigerant￿at￿low￿temperature￿and￿low￿pressure￿is￿drawn￿in
through￿two￿openings￿in￿the￿fixed￿outer￿disc￿with￿spiral￿profile￿and￿compressed￿and￿heated￿by￿the
movement￿of￿the￿two￿discs￿with￿spiral￿profiles.
Principle￿of￿refrigerant￿compression
After￿three￿revolutions,￿the￿refrigerant￿drawn￿in￿is￿compressed￿and￿heated￿and￿can￿escape￿in￿a
gaseous￿state￿through￿an￿opening￿in￿the￿center￿of￿the￿outer￿disc.￿From￿here,￿gaseous￿refrigerant
with￿high￿temperature￿and￿high￿pressure￿escapes￿via￿an￿oil￿separator￿at￿the￿connection￿of￿the￿A/C
compressor￿towards￿the￿condenser.￿The￿EKK￿is￿operated￿at￿maximum￿8600 rpm￿and￿generates￿a
maximum￿operating￿pressure￿of￿about￿30 bar.
7.3.￿High-voltage￿safety
134
Explanation
Shaft
Inner￿disc￿with￿spiral￿profile
Outer￿disc￿with￿spiral￿profile