| 摘要 |
A DC machine for use as a DC motor (10) or generator, comprising an outer casing (100), and a rotor (200) comprising a central shaft (220) and at least one cylindrical permanent magnet (230) which has a central axis coincident with the shaft (220) and is supported for rotation about its axis within the casing (100). The magnet (230) provides a unipolar radial magnetic field. An annular gap (218) is formed within the rotor (200), which extends co-axially with the magnet (230) such that the magnetic flux of the radial magnetic field extends at substantially right angles across opposite sides of the gap (218). The motor (10) includes a cylindrical stator (300) located co-axially within the gap (218). The stator (300) comprises an armature in the form of a hollow cylindrical roll (310) of elongate insulating substrate (320) having one surface bearing a conductive pattern (330). The pattern (330) has two ends for connection to a DC power source and includes a multiplicity of straight conductors (334). The conductors (334) extend axially with respect to the roll (310) and are interconnected such that a DC current can flow along the conductors (334) in the same axial direction for intersection with the magnetic flux of the radial magnetic field to cause rotation of the rotor (200).
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