To provide a high-efficiency brushless electrical machine with a control circuit having a simpler configuration.

A first moving member has a magnet assembly (20) while a second moving member includes an electromagnetic coil (30). A control circuit controls power supply to the electromagnetic coil (30) or regeneration of power from the electromagnetic coil (30). The magnet assembly (20) generates the strongest magnetic field along a magnetic-field direction (MD) from inside to outside in the magnet assembly, i.e., along the magnetic-field direction (MD) on the surface of the interface between magnets adjacent to each other. The electromagnetic coil (30) is arranged such that a current flows in a direction (CD) intersecting with the magnetic-field direction (MD).

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