Stator winding for an electric motor

A method for forming a stator in an electric motor comprising:

• electrically separating a first winding branch into first and second portions;
• electrically separating a second winding branch into first and second portions;
• wherein the first and second winding branches are positioned radially outward of opposing sides of a rotor;
• electrically connecting a first frequency converter to the first portion of the first winding branch and to the first portion of the second winding branch in series;
• and electrically connecting a second frequency converter to the second portion of the first winding branch and to the second portion of the second winding branch in series, such that wherein a net radial force acting on the rotor is substantially zero with one of the first and second frequency convertors powered off.

An electric motor comprising:

• a stator having a pair of coils positioned on opposing sides of a rotor;
• coil windings separated into two parallel branches electrically isolated from one another and wound about corresponding stator cores;
• a pair of electrically isolated elements defined by each coil;
• wherein each of the two parallel branches are wound about the first and second elements of each coil;
• and wherein first elements of each of the paired coils are electrically connected together in series and second elements of each of the paired coils are connected together in series with corresponding coil windings;
• a first frequency converter electrically connected to each of the first elements by wire windings in series;
• and a second frequency converter electrically connected to each of the second elements by wire windings in series;
• a rotor positioned radially inward of the stator;
• and
• wherein the electric motor is operable with one frequency converter to provide electrical power to one of the plurality of elements connected in series without generating an unbalanced radial force on the rotor.