Dynamically reconfigurable motors and generators and systems with efficiency optimization

A system comprising:

• a motor/generator having a plurality of winding groups, wherein one side of each winding in a group is connected to a collection bar, and the windings are configured such that the number of poles and the number of phases in a pair of poles of the motor/generator can be dynamically adjusted;
• and
• a plurality of power converter groups controlled by a controller, wherein each power converter group comprises a plurality of power converters coupled between an input voltage sources and a group of windings for controlling currents of the windings, and the controller has a pole number decision block configured to change the number of poles of the motor/generator.

A method comprising:

• regulating currents of windings of a motor/generator through a power electronics system so that the number of poles and number of phases in a pair of poles are dynamically adjustable and the field strength of a magnetic field of the motor/generator is controlled, wherein the windings of the motor/generator are configured to be dynamically assignable to a pair of poles and a phase;
• and
• configuring a control system such that the number of poles is decided dynamically by a pole number decision block and a power loss is minimized with consideration of the number of poles and the strength of the magnetic field.