Nonlinear time-frequency control of PM synchronous motor instability applicable to electric vehicle application
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© 2015, Springer-Verlag Berlin Heidelberg. Of the many technologies being explored to address sustainability and environmental issues, electric cars are considered to be the most promising alternative to vehicles powered by IC engines. This paper studies the instability control of electric vehicles propelled by permanent magnet synchronous motors (PMSMs). The nonlinear characteristics of a surface-mounted PMSM model are studied under three different assumed driving conditions. To mitigate undesirable dynamic instabilities including hyperchaotic responses that are frequented at low and high speeds, so as to extend the operating range of the PMSM system, a novel control scheme that exerts simultaneous control in both the time and frequency domains is developed and subsequently validated. The control approach has its foundation established in discrete wavelet transformation and adaptive control. Its physical implementation consists of an adaptive controller and an adaptive filter both implemented in the wavelet domain. Numerical results demonstrate the effectiveness of the controller design in restoring PMSM instability with low-amplitude limit-cycle in response to a properly specified reference signal.
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