Stepping motor

Claim 2

A stepping motor comprising a rotatably movable rotor having mounted thereon a cylindrical permanent magnet, two field poles, each of the field poles having a major and a minor pole with a flux gap therebetween and each of the field poles having an arcuate shape and being positioned so as to surround the cylindrical magnet of the rotor, a coil energizable to magnetize the field poles, each of the field poles being tilted and formed in the shape of a spiral section of a cylinder surrounding the cylindrical magnet so as to ensure rotation of the rotor in a single direction.

Claim 3

A stepping motor comprising first and second parallel mounting plates composed of magnetically conductive material, a field coil disposed between the mounting plates and adapted to being engaged from a remote source of voltage, a core comprised of magnetically conductive material and projecting through the field core and connecting the first and second plates so as to conduct magnetic force thereto, a bearing on each of the first and second plates, a field pole of magnetically conductive material projecting from each of the first and second plates toward the opposite plate and magnetizable by the field coil through the first and second plates, each field pole having an arcuate curvature such that a cylindrical space is defined between the poles, each of the field poles having a major and a minor pole with a flux gap defined therebetween, and a rotor including a cylindrical permanent magnet with a mounting shaft therethrough and a conical point at each end of the shaft, each of the conical points being received in a respective one of said bearings such that the rotor is positioned between the first and second plates in a freely rotatable manner and the magnet on the rotor is positioned in the space between the field poles, each of the field poles being tilted in a common direction to ensure rotation of the rotor in a single direction.

Claim 4

A stepping motor comprising first and second parallel mounting plates composed of magnetically conductive material, a field coil disposed between the mounting plates and adapted to being engaged from a remote source of voltage, a core comprised of magnetically conductive material and projecting through the field core and connecting the first and second plates so as to conduct magnetic force thereto, a bearing on each of the first and second plates, a field pole of magnetically conductive material projecting from each of the first and second plates toward the opposite plate and magnetizable by the field coil through the first and second plates, each field pole having an arcuate curvature such that a cylindrical space is defined between the poles, each of the field poles having a major and a minor pole with a flux gap defined therebetween, and a rotor including a cylindrical permanent magnet with a mounting shaft therethrough and a conical point at each end of the shaft, each of the conical points being received in a respective one of said bearings such that the rotor is positioned between the first and second plates in a freely rotatable manner and the magnet on the rotor is positioned in the space between the field poles, each of the field poles being tilted in a common direction to ensure rotation of the rotor in a single direction.

Claim 5

A stepping motor as claimed in claim 1 wherein the coil is mounted between a pair of magnetically conductive plates with a magnetizable core extending through the coil to connect the plates, the field poles each being mounted on a respective one of the plates so that they can be magnetized by the field coil through the plates.