First, according to the working characteristics of pump-type loads of an aero permanent magnet synchronous motor (PMSM), the sensorless operation of the motor is realized based on a nonlinear flux observer, and an improved time-delay compensation strategy is proposed to obtain the command voltage. Due to the influence of the inverter’s nonlinear time-delay, the phenomena such as an increase in the dq-axis current coupling effect and the time-delay of estimated rotor position will occur in the feedback current, which degrade the sensorless control performance. Then, to address this issue, an adaptive disturbance observer is designed to obtain the q-axis disturbance voltage caused by the inverter’s nonlinear time-delay under full-speed SVPWM modulation. Finally, the compensation time estimated in real time is obtained under the current control strategy with id=0, which is further equivalent to the three-phase voltage compensation value acting on the given three-phase voltage. The proposed nonlinear time-delay compensation strategy for inverters put forward was verified by experiments, and results show that the proposed strategy can effectively improve the sensorless control performance of the nonlinear flux observer at low speeds.
| 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 |