Embodiments of the present invention provide a permanent magnet motor secondary unit and a permanent magnet motor secondary, wherein the permanent magnet motor secondary unit comprises a permanent magnet array; the permanent magnet array is composed of a plurality of permanent magnets arranged based on pulse width modulation and/or pulse frequency modulation. According to the permanent magnet motor secondary unit and the permanent magnet motor secondary provided by the embodiments of the present invention, compared with the conventional permanent magnet motor secondary unit, the plurality of permanent magnets replace a single permanent magnet, which greatly reduces the width of permanent magnets, improves the mechanical strength of the permanent magnet motor secondary unit, solves the problem of difficult magnetizing of a large permanent magnet, and reduces the processing cost of the motor. In addition, the permanent magnets in the permanent magnet array are arranged based on pulse width modulation and/or pulse frequency modulation, which helps to reduce the total distortion rate of the magnetomotive force waveform and further improve the stability of the electromagnetic thrust.