Patent ID: 11959681
Assignee: NIDEC GLOBAL APPLIANCE BRASIL LTDA.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  H | IPC F  H

Claim 0:
1. A system for operational acoustic optimization of a variable speed compressor (2), the system comprising a variable speed compressor (2) that comprises a synchronous motor (6), a frequency inverter (3) and a control processor (5);
the frequency inverter (3) being electrically connected to the synchronous motor (6) and an electrical network (4);
the control processor (5) being electrically connected to the frequency inverter (3) and being configured to control the speed of the synchronous motor (6) included in the variable speed compressor (2);
wherein the control processor (5) is further configured to establish a first switching frequency (F1) and a second switching frequency (F2) of the frequency inverter (3) to supply the synchronous motor (6) with a power supply signal (9), whereby the first switching frequency (F1) is located in a region of the frequency spectrum that is higher than 20 kHz or in a non-audible region of the frequency spectrum;
the control processor (5) being configured to further establish a time period (T1) in which the synchronous motor (6) will be fed by the frequency inverter signal (3) with the first switching frequency (F1);
wherein
the time period (T1) corresponds to at least one alignment operation period of the motor (6);
the frequency inverter (3) being configured to start the variable speed compressor (2) by supplying motor (6) with a signal (9) with the first switching frequency (F1) for the duration of the time period (T1); and
the frequency inverter (3) being further configured to supply the motor (6) with a signal (9) with the second switching frequency (F2) after the time period (T1).