Full
Outline
High-speed permanent magnet synchronous motors have characteristics of small stator inductance and high fundamental frequency, and using traditional voltage source inverters to drive them may lead to large stator current ripple and high torque ripple. Variable bus voltage-type inverters can be used to reduce the current ripple, but the traditional variable bus voltage control strategies have numerous parameters and complex calculations. In response to this issue, a relatively simple variable bus current control strategy is proposed, which directly adjusts the DC bus current output from the previous stage to achieve the motor speed control and reduce the stator winding current ripple. Zero d-axis current control is achieved through magnetic field vector amplitude control and phase angle allocation. First, the topology and working mode of a variable bus current-type inverter used were introduced, and the mechanism of reducing the stator winding current ripple by this topology was analyzed. Then, based on this topology, a relatively simple variable bus current control strategy was put forward, and its computational complexity was compared with that under the traditional variable bus voltage control strategy. Under the proposed control strategy, the amplitude and angle of the magnetic field vector were separated, and a control model for the system was established, in which the amplitude control was used to adjust the motor output torque and the angle control was used to achieve motor rotor traction and torque angle control. Finally, the effectiveness of the proposed topology and its control strategy was verified through simulation and experimental results. Specifically, the stable control of a high-speed motor at 80 000 r/min was achieved in the experiment, achieving zero d-axis current control and effectively reducing the stator winding current ripple.
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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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