According to one embodiment, a motor includes at least two base units. The base units are arranged along an axis of rotation of the motor. The base units each includes a rotor unit and an armature unit. The rotor unit is formed cylindrical, rotatable about the axis of rotation, and provided with permanent magnets. The armature unit includes a plurality of tripolar armature cores, and a first annular coil and a second annular coil coaxial with respect to the axis of rotation. In each of the at least two base units, the first annular coil is provided in a first annular space, the second annular coil is provided in a second annular space, and opposite currents are applied to the first and second annular coils.