A stator core of a motor arrangement includes six cores, which are
arranged one after another in a circumferential direction. A bobbin,
which is made of dielectric resin, is fitted to each core. Each coil is
formed such that a winding is wound around the bobbin through a
concentrated winding technique. Dielectric resin is filled between each
circumferentially adjacent two teeth to cover each coil. Furthermore, the
dielectric resin is molded to form clearances, each of which is formed
between the corresponding circumferentially adjacent two teeth on a rotor
side. Fuel, which is pressurized by a pump arrangement, passes an
interior of the motor arrangement through a fuel passage, which is a gap
between an inner peripheral surface of the stator core and an outer
peripheral surface of the rotor, and also through the clearances.