Abstract
The more electric aircraft provides 115 V/360~800 Hz variable frequency power supply for the variable frequency asynchronous motor, and the motor operation characteristics change with the power frequency variation. It causes the starting pulse vibration torque with the low-frequency power supply (360 Hz) to increase greatly and the mechanical shock and fatigue damage. Therefore, this paper proposes step-down starting method with the low-frequency power supply. Based on the electromagnetic principles generated by the starting pulse vibration torque, this paper uses a novel method of simulation data fitting to establish an approximate model of the starting pulse vibration torque. The parameter design formulas of the low-frequency step-down starting methods, including the reducing voltage, the series resistance, and the series inductance are proposed. The effectiveness of the different methods are verified, and the performance is compared through the simulation. The experimental verification of a small power asynchronous motor is completed. The simulation and experiment results show that the low-frequency step-down starting methods effectively reduce the starting peak torque, and also suppress the shock impact of starting current on the power supply.
Highlights
Regarding the asynchronous motor starting characteristic, the research and analysis contents pay more attention to issues such as the large starting current and the small starting torque [1,2]
The ref [3,4] mainly indicate that the starting pulse vibration torque effect of 50 Hz constant frequency asynchronous motor is transmitted to the mechanical system through the couplings of multiple physical domains, which leads to the bearing resonance and fracture
This paper proposes a control method of low-frequency step-down starting to reduce the starting pulse vibration torque with the low-frequency power
Summary
Regarding the asynchronous motor starting characteristic, the research and analysis contents pay more attention to issues such as the large starting current and the small starting torque [1,2]. The starting pulse vibration of aviation variable frequency asynchronous motors is very large at a low-frequency (360 Hz) power supply, and the impact on the mechanical system is more serious [19]. Based on the electromagnetic principle of starting pulse vibration torque, the paper establishes a mathematical model of the starting pulse vibration torque through the method of simulation data fitting, and proposes that the minimum peak torque caused by the starting pulse vibration torque is applied as the design goal. It derives the parameter calculation formulas of the low-frequency step-down starting, including the voltage reduction, the series resistance, and the series inductance. The method feasibility is verified by simulation and experiments
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