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The permanent magnet synchronous motor (PMSM) drive with small direct− current link (DC−link) capacitors has significant advantages of high power density and high reliability, and has been widely used in the industrial applications such as transportation and home appliances. It also has broad application prospects in high−end equipment fields such as aerospace. However, due to the reduction of DC−link capacitance, there exists the harmonics coupling between dq−axis current, which increase the difficulty of extracting the beat amplitude directly and the performance reduction of traditional method, which only suppressing current harmonics in single axis. To realize the direct regulation of the beat phenomenon, this paper proposes an impedance reshaping strategy based on the reconstruction of the beat envelope, which can eliminate the coupling of beat amplitude from dq−axis harmonics. The relationship among the current harmonics, the voltage harmonics in dq−axes, and the beat envelope amplitude is analyzed through the impedance model in the field weakening region. On this basis, the motor voltage harmonics in dq−axes are applied to extract the beat amplitude with the mean values of the motor currents in dq−axes, whose accuracy can be maintained under the current coupling. The closed loop of the beat amplitude is built to improve he adaptability to the motor speed and torque, and the output is the adjusting angle for the voltage reference vector, which is used to reshape the impedance relationship between the beat amplitude and rectifier voltage. Experimental results show that the strategy can suppress the beat phenomenon of the motor current effectively and solve the scientific problem of motor oscillation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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