Two-pole permanent magnet synchronous motor rotor

A two pole rotor for a permanent magnet synchronous motor comprising:

• a plurality of magnetic laminations aligned to form a rotor body, said laminations having openings which align to define
• (i) a set of rotor bar slots disposed about the periphery of the rotor body;
• (ii) a central opening extending axially through said rotor body to define a shaft opening;
• (iii) first and second pairs of magnet slots disposed symmetrically about said central opening, the slots of each pair being separated by a bridge of magnetic material formed integrally with said laminations, said bridges being 180.degree. apart, each of said magnet slots comprising at least two straight segments disposed generally parallel to lines tangent to the periphery of said central opening, and
• (iv) a third pair of magnetic slots lying along a common diametrical line displaced 90.degree. from said magnetic bridges, each one of said third pair of slots extending radially outwardly to a point close to the periphery of said rotor body and inwardly to a point between the ends of the magnet slots of said first and second pair of slots;
• and
• a plurality of permanent magnets disposed in said magnet slots,
• said bridges aligning with the direct axis of a motor stator when rotor is placed therein and said third pair of magnet slots is aligned with the quadature axis of said stator.