Inductance Analysis of Transverse Flux Linear Synchronous Motor for Maglev Trains Considering Three-Dimensional Operating Conditions

Control Strategies of Thrust Ripple Suppression for Electromagnetic Microgravity Facility

“…In LIMs, the negative-sequence component of the current introduces thrust ripple and fluctuations in the d-axis and q-axis currents. There are two types of thrust ripple that exist in LIMs [10]. One is the thrust ripple at a frequency of 2f (where f represents the supply frequency) generated by the stator negative-sequence current, and the other is the thrust fluctuation at a frequency of 2sf (where s represents slip) generated by the rotor negative-sequence current.…”

“…However, this approach often relies on simulation for theoretical analysis and is challenging to integrate with practical control applications. The second aspect involves analyzing the impedance asymmetry of LIMs from a mathematical model perspective [9,10]. One study [9] mainly analyzes impedance asymmetry in the ABC coordinate system, while another [10] provides a 𝑑𝑞 coordinate system's inductance matrix model, which is more convenient for application in field-oriented control (FOC) systems.…”

“…The second aspect involves analyzing the impedance asymmetry of LIMs from a mathematical model perspective [9,10]. One study [9] mainly analyzes impedance asymmetry in the ABC coordinate system, while another [10] provides a 𝑑𝑞 coordinate system's inductance matrix model, which is more convenient for application in field-oriented control (FOC) systems. The third aspect involves analyzing the equivalent circuit perspective, introducing a coefficient 𝑓(𝑄) at the excitation inductance to reflect the end effects of a LIM [11][12][13].…”