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US 4,714,851 AGranted
Single-phase synchronous motor comprising a two-pole permanent-magnet rotor
AssigneeU.S. Philips Corporation
InventorsLeo Bertram, Hugo Schemmann
Life of this patent
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Abstract
A single-phase synchronous motor comprises a two-pole permanent-magnet rotor (5) between two electromagnetically excited stator coils (9). At the location of the median plane (33) parallel to the direction of magnetization (37) parallel to the direction of the permanent-magnet rotor (5) has a shape which deviates from a cylindrical shape and the dimension of the permanent-magnet rotor (5) in the direction of magnetization (37) is largest near the median plane (33).
Claims8
A single phase synchronous motor comprising
- a stator having two arcuate poles, each pole having an arc portion of large diameter and an arc portion of small diameter, said arc portions of large diameter being diametrically opposed, said arc portions of small diameter being diametrically opposed,
- a two-pole permanent magnet rotor between the poles of said stator, said rotor having median plane in which the axis of rotation lies, the direction of magnetization of said rotor being parallel to said median plane, the peripheral surface of the rotor having a shape which deviates from a cylindrical shape, the dimension of the rotor in the direction of magnetization being largest near the median plane.
Dependencies are inferred from the claim text.