Electric machine having a heat dissipating construction

摘要

An electric machine comprises an outer casing (2), a rotor and a stator (3) having at least one polar expansion (5) and at least one winding (8) having an annular shape and placed around the polar expansion (5). The casing (2) has a plurality of protrusions (13) each of which holds, by supporting, a corresponding portion (12) of a stator winding (8) to enable heat exchange between the winding (8) and the protrusion (13). Each portion (12) of the winding (8) is electrically insulated from the respective protrusion (13).

主权项

1. An electric machine comprising:
an outer casing; a stator having a plurality of polar expansions and a plurality of windings, each winding having an annular shape and fitted around one of the polar expansions; a rotor; wherein the casing has a plurality of separate butting portions, each paired with one of the windings to engage and support a portion of the winding to enable heat exchange between the winding and the butting portion, the winding being electrically insulated from the butting portion when engaged with the butting portion; wherein the casing comprises a bottom wall lying substantially perpendicular to an axis of rotation of the rotor, each butting portion being formed by an integral and solid protrusion of the bottom wall facing a space inside the electric machine and extending away from an interior facing side of the bottom wall and into the space inside the electric machine along a line parallel to an axis of rotation of the rotor; each butting portion having a center radial plane generally aligned with a central radial plane of the winding with which it is paired; a radially extending passage positioned between two adjacent butting portions for allowing cooling air to flow between the two adjacent butting portions.