Permanent-magnet electric motor for circulation pumps of heating systems

DETAILED DESCRIPTION The aim of the present invention is to provide an electric motor for circulation pumps of heating systems having such a structure which allows to eliminate or substantially reduce the problems noted above in conventional motors.
Within the scope of the above aim, a consequent primary object of the invention is to provide a motor which is compact and constructively solid.
Another important object is to provide an electric motor having a structure which is capable of providing good heat dissipation into the environment.
Another object of the invention is to provide a motor whose structure can integrate a plurality of components and therefore achieves considerable benefits in terms of simplicity of assembly.
Another object of the invention is to provide a motor having a structure which is competitive with respect to conventional motors also from the point of view of costs.
This aim and these and other objects which will become better apparent hereinafter are achieved by a permanent-magnet electric motor for circulation pumps of heating systems, comprising: a stator composed of a pack of metallic laminations which form pole shoes to which electrical windings are coupled; a permanent-magnet rotor, arranged in a chamber separated with a watertight seal and electrically insulated from the stator; characterized in that said chamber that contains the rotor has a cross-section which duplicates the contour of the pole shoes in regions affected by said pole shoes and is shaped so as to form wider portions in regions that are not affected by said pole shoes.
Advantageously, the cross-section of said chamber that contains the rotor is substantially square, with central regions of the sides which widen in an arc-like shape.