Abstract: A frame (14) for a permanent magnet direct current motor (10) is formed of a plurality of frame modules (15). Each frame module (15) is of equal axial length and cross-sectional dimensions for being matingly connected together end-to-end to form the tubular frame (14) to a desired length.

Abstract: A motor frame and stator assembly (20), (27), for a permanent magnet direct current motor is shown which is characterized by accommodating a larger and more powerful armature (12) relative to the interior and exterior dimensions of the frame (20). The assembly (20), (27) includes a metal frame (20) having a pre-determined length and continuous walls the inner surface of which define a void (24). A plurality of arcuate, recessed seats (25) is formed into the inner walls of the frame (20) in spaced-apart intervals around and extending along at least a part of the length of the frame (20). The walls of the frame (20) along the extent of the seats (25) are of reduced cross-sectional thickness. A plurality of permanent magnets (27) having a convex and concave side are mounted by the convex side against one of the plurality of seats (25). A permanent magnet DC motor (10) constructed of one or more metal frame modules (20) is also disclosed.