Abstract
As a typical electromechanically coupled system, the super-high-speed permanent magnet synchronous motor (PMSM)-driven compressor always exhibits complex dynamic behavior, affecting the comprehensive performance of the fuel cell system. Based on this, this paper takes electromagnetic and load excitations into account and establishes a mathematical model of the super-high-speed PMSM-driven compressor. Then, the corresponding simulation is carried out, revealing that according to different causes and manifestations, the system gradually exhibits amplitude instability and frequency instability. Considering the stiffness softening effect, the effect of the torsional stiffness and damping coefficient on the dynamic characteristics under different forms of instability is obtained. Using the Routh-Hurwitz criterion and Melnikov theory, a damping optimization methodology is given. The results show that under the condition of amplitude instability, damping reduction and stiffness softening lead to a greater resonant amplitude and a wider resonance region. Under the condition of frequency instability, the system becomes chaotic via periodic-doubling bifurcation with the decrease of damping, and the decrease of torsional stiffness increases the damping required to maintain the stability.
Highlights
As a core unit for fuel cell systems, the operation stability of the super-high-speed permanent magnet synchronous motor (PMSM)-driven compressor influences the comprehensive performance of the fuel cell system significantly, especially the operation efficiency [1], [2]
DETERMINATION OF THE MOTION STATE Serious problems associated with the complex dynamic behavior in super-high-speed PMSM-driven compressors are obvious under load and electromagnetic excitations
A mathematical model of a super-high-speed PMSM-driven compressor for a fuel cell system under multiple excitations is established in this paper, and the influence factors of the dynamic characteristics are investigated by taking the stiffness softening effect into consideration
Summary
As a core unit for fuel cell systems, the operation stability of the super-high-speed PMSM-driven compressor influences the comprehensive performance of the fuel cell system significantly, especially the operation efficiency [1], [2]. Considering the stiffness softening effect of the super-high-speed PMSM-driven compressor, the effect of torsional stiffness and damping on the dynamic behavior is studied through numerical simulations. 3. As an important factor in the super-high-speed PMSM-driven compressor, the damping in different instability conditions is optimized by applying the Routh-Hurwitz criterion and Melnikov method in this paper. DETERMINATION OF THE MOTION STATE Serious problems associated with the complex dynamic behavior in super-high-speed PMSM-driven compressors are obvious under load and electromagnetic excitations. According to super-high-speed PMSM-driven compressor parameters and related equations, we can obtain η = 3, β = 9, and γ = 3. The maximum amplitude of the primary resonance of the super-high-speed PMSM-driven compressor can be expressed as f amax = ω0μ (29). The threshold for parameter stability can be obtained, μ > f I2
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