Hybrid field permanent magnet motor

A DC motor comprising:

• a housing
• a plurality of permanent magnet poles disposed in said housing and each including:
• a precast permanent magnet having an arcuate pole face of predetermined surface configuration, an opposite surface of cylindrical configuration conforming to the confronting wall of said housing, and first and second side walls inwardly tapered toward and terminating at said pole face, said pole face and confronting armature defining a gap of smallest dimension at the center of said pole face and of increasing dimension toward the tips thereof;
• and
• an opening extending through the magnet in a direction parallel to the motor axis;
• a plurality of elongated spring members, each disposed between a pair of adjacent magnet poles and operative to maintain said poles in predetermined position within said housing, said spring members providing elongated channels between adjacent ones of said poles and extending parallel to the motor axis;
• an armature disposed within said poles and mounted on said housing for rotation with respect to said housing and said poles;
• said housing providing a flux return for said permanent magnet poles;
• and
• a plurality of field coils, each disposed around a respective permanent magnet pole and having sides disposed in respective channels of said spring members;
• said field coils being connected in split series connection to provide a split series aiding field winding;
• said housing including:
• a cylindrical casing and first and second end bells cooperative therewith, each of said end bells having bearing means for rotational support of said armature;
• and
• a plurality of through bolts, each adapted for passage through a respective opening in corresponding ones of said permanent magnets for securing said end bells to said casing.

A DC motor comprising:

• a housing;
• a plurality of permanent magnet poles disposed in said housing;
• a plurality of elongated spring members having inwardly extending end portions, each spring member disposed between a pair of adjacent magnet poles and operative to maintain said poles in predetermined position within said housing, said spring members providing elongated channels between adjacent ones of said poles and extending parallel to the motor axis, said channels providing space within said housing for field coils;
• an armature disposed within said poles and mounted on said housing for rotation with respect to said housing and said poles;
• said housing providing a flux return path for said permanent magnet poles;
• and
• a plurality of field coils, each disposed around a respective permanent magnet pole and having sides disposed in respective channels of said spring members;
• said field coils being connected in split series connection to provide a split series aiding field winding;
• a plurality of insulating strips, each disposed within a respective channel of a corresponding spring member and operative to compact the turns of the field coil disposed in said channel to provide efficient heat transfer to said housing, said strips securely held in respective channels by said inwardly extending end portions.