A frameless switched reluctance motor (SRM) has a stator sandwiched
between two housings. Axial load on the rotor shaft is directed through a
first bearing, through the first housing to the stator and through the
second housing to a motor support. Heat is dissipated using low-loss
electrical steel, one or more air movers and air passages through the
motor. Preferably a stator profile enables the air passages to be formed
through the stator's lamination stack. Optionally air is routed through
passages between the coils and through air passages along the air gap and
radially through passages between an upper and a lower stator. A first
self aligning bearing adapts to misalignment between the first housing
and the shaft and a second bearing is provided with transverse movement.
Preferably, the frameless motor is adapted for support to a wellhead for
driving a downhole rotary pump and a rotary rod string.