Motor-generator with radial-flux double-sided stator

An energy storage system, comprising:

• a motor-generator, comprising:
• a double-sided stator comprising a first stator pole wound with a first stator winding of a first channel and a second stator pole wound with a second stator winding of a second channel, wherein the first stator pole and the second stator pole are axially aligned with respect to a centerline of the motor-generator and radially offset between a radially inner side and a radially outer side of the double-sided stator;
• and
• at least one rotor radially disposed from the double-sided stator with respect to the centerline of the motor-generator;
• and
• a flywheel operably coupled to the at least one rotor, the flywheel configured to store kinetic energy received as electric energy at the double-sided stator of the motor-generator,
• a wheel;
• a wheel motor coupled to the wheel;
• and
• a first power converter electrically connected to the wheel motor and the motor-generator,
• a second power converter electrically connected to the motor-generator;
• and
• a battery electrically connected to the second power converter,
• a third power converter electrically connected between the second power converter and the battery,
• wherein the first power converter is an alternating current (AC)/direct current (DC)/AC converter, the second power converter is an AC/DC converter, and the third power converter is a DC/DC converter,
• wherein the first power converter is a three-phase, four quadrant converter configured to facilitate bidirectional power transfer between the wheel motor and the motor-generator.