Abstract The Linear generator is the key equipment for contactless on-board power supply in the high-speed maglev system, and its output characteristics under multiple working conditions are the leading indicators of power generation capacity. The three-dimensional magnetic flux of the superconducting magnet is characterized by the space harmonic method, and the magnetomotive force distribution model of the linear generator is established. By analyzing the electromagnetic coupling relationship between the superconducting magnet and the suspension coil of the track-side wall, the expressions of the suspension coil current and the magnetic flux density of the suspension coil harmonic magnetic field are obtained. Further, the harmonic magnetic field of the suspension coil is used as the current collector coil to excite, and the numeric analytical expression for the induced electromotive force of the linear generator under multiple working conditions is deduced. Finally, compared with the test data of the Yamanashi Line in Japan, the accuracy of the magnetomotive force distribution model and the electromagnetic analytical model is verified. This work provides a theoretical basis for designing and controlling of linear generators for high-speed maglev systems.
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