公开(公告)号：US20170218965A1

公开(公告)日：2017-08-03

申请号：US15418326

申请日：2017-01-27

Applicant: ABB Technology Oy

Inventor： Juha Saukko ,  Markku Lyyjynen ,  Jukka Tolvanen

IPC: F04D27/00 ,  F04D17/10 ,  F04C29/00 ,  F04C28/08 ,  F04C28/28 ,  F04D25/06 ,  F04C18/16

CPC classification number: F04B49/065 ,  F04B41/02 ,  F04B49/022 ,  F04B2203/0207 ,  F04B2203/0208 ,  F04C28/06 ,  F04C28/08 ,  F04C28/24 ,  F04C28/28 ,  F04C2240/40 ,  F04C2270/015 ,  F04C2270/025 ,  F04C2270/035 ,  F04C2270/075 ,  F04C2270/095 ,  F04C2270/185 ,  F04D15/0066 ,  F04D15/0088 ,  F04D27/001 ,  F04D27/004

Abstract: The present disclosure describes a load/unload control method for a compressor system with a rotating compressor connected to a pressure vessel. In the method, the present operating state can be monitored on the basis of a monitored/estimated electrical quantity of the compressor system, The method comprises an identification phase and an operational phase. In the identification phase, the compressor is operated at a constant rotational speed to generate two known pressures to the pressure vessel. At least one electrical quantity is monitored, and values of the electrical quantity corresponding to the pressure limits are stored. In the operational phase, reaching of a pressure limit may then be detected by comparing the present value of the monitored electrical quantity to the stored values.

公开(公告)号：US20170218964A1

公开(公告)日：2017-08-03

申请号：US15418242

申请日：2017-01-27

Applicant: ABB Technology Oy

Inventor： Juha Saukko ,  Markku Lyyjynen ,  Jukka Tolvanen

IPC: F04D27/00 ,  F04D25/06

CPC classification number: F04D27/001 ,  F04B35/04 ,  F04B41/02 ,  F04B49/06 ,  F04B49/065 ,  F04B49/08 ,  F04B49/103 ,  F04B49/20 ,  F04B2203/0207 ,  F04B2203/0208 ,  F04B2203/0209

Abstract: The present disclosure describes a control method for a compressor system that comprises a compressor connected to a pressure vessel and a frequency converter controlling an electric motor of the compressor. In the method, the present operating state is estimated on the basis of a monitored/estimated electrical quantity of the compressor system. The operating state may represent the pressure in the pressure vessel. The pressure in the pressure vessel causes a counter-torque to the motor. The counter-torque is proportional to the pressure and may be used for estimating the pressure inside the pressure vessel. An estimate of a counter-torque may be calculated on the basis of the monitored electrical quantity or quantities.