To obtain high-quality yellow peach wines of varying characteristics, different fermentation strategies, including various pre-fermentative treatments, were applied. This study aimed to determine the effect of different fermentation strategies on the physicochemical properties, monomer phenol content, in vitro antioxidant activity, and volatile compounds of yellow peach wine. The results showed that peach wine P12, fermented with pulp, had higher total phenolic content (TPC), total flavonoid content (TFC), monomer phenol and volatile compound content, and antioxidant activity. Ten monomeric phenols were detected in peach wines, and the content of catechin was the highest. Juice fermentation wine, J12, had a strong floral aroma, and some volatile compounds were released during fermentation when water was added to the pulp, and low alcohol content did not reduce the variety of volatile compounds. The main aroma and common characteristics of the fermented yellow peach wine were dominated by esters, with a relative odor activity value (ROAV) ≥ 1, namely, isoamyl acetate, ethyl hexanoate, and ethyl octanoate. Our results demonstrated that the application of the described fermentation strategies significantly affected the quality and volatile compound content of yellow peach wines. This might assist in the development of a highly diverse yellow peach wine flavor.

PMSM vector control system is widely used in servo systems and speed regulating systems. In this paper, the application problems of PMSM vector control system are discussed. The AC parameters in the three-phase static coordinate are transformed into DC value in the two-phase rotated coordinate by coordinating transformations. The control process is simplified. The PMSM is virtualized as a separately excited DC motor using the control method of i d = 0. Six PWM signals are generated to control IPM module using SVPWM algorithm. Finally, the PMSM vector control system is realized, which is composed of TMS320F2812, photo-electricity encoder, hall current sensors and IPM module. It is demonstrated that the system has a good dynamic performance and steady-state precision.

No abstract