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

Claim 5:
6. A method for operational acoustic optimization of a variable speed compressor (2) comprising a synchronous motor (6), the compressor (2) being electrically associated with a frequency inverter (3) and a control processor (5); the method comprising:
(a) establishing a first switching frequency (F1), 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;
(b) establishing a second switching frequency (F2);
(c) establishing a time period (T1), which corresponds to the duration of at least one aligning operation of the synchronous motor (6);
(d) starting the variable speed compressor (2) by supplying the synchronous motor (6) with a signal (9) with the first switching frequency (F1) established in step (a), during the time period (T1) established in step (c); and
(e) after the time period (T1) established in step (c), supply the synchronous motor (6) with a signal (9) with the second switching frequency (F2) established in step (b).