Electric motor and magnetic gear

An electric motor and compressor assembly comprising:

• a motor casing;
• a high speed stator and a low speed stator mounted within the motor casing side-by-side;
• the high speed stator and the low speed stator each including winding systems having separate windings and electrical connections between the separate windings configured such that the separate windings are able to be separately exited by out-of-phase electrical currents generated by a multiphase alternating current source and thereby to produce magnetic fields emanating from stator pole pairs of the separate windings rotating around each of the high speed stator and the low speed stator in opposite directions when the windings are connected to the multiphase alternating current source;
• a low speed rotor mounted within the motor casing for rotation, coaxial to and surrounded by the high speed stator and the low speed stator, the low speed rotor having a first set of pole pieces mounted at one end thereof and opposite to the low speed stator such that the magnetic fields produced by the low speed stator are able to induce a rotation of the low speed rotor in a rotation direction of the of the magnetic fields produced by the low speed stator and a set of ferrous pieces mounted at the other end and opposite to the high speed stator and separated from one another by non-ferrous regions of the low speed stator so as to be able to conduct the magnetic fields produced by the high speed stator;
• a high speed rotor mounted within the motor casing for rotation coaxial to the low speed rotor and telescoped within the low speed rotor, the high speed rotor having a second set of pole pieces opposite to the ferrous pieces of the low speed rotor and the high speed stator;
• and
• the set of ferrous pieces of the low speed rotor present in a number equal to a sum of the stator pole pairs of the high speed stator and rotor pole pairs provided by the pole pieces of the high speed rotor so that motion of the ferrous pieces produced by the rotation of the low speed rotor in turn produces a gearing effect in which the high speed rotor rotates at a higher speed than the magnetic fields produced by the high speed stator and in an opposite direction theretopole pairs;
• and
• a compressor directly coupled to the high speed rotor to compress a fluid within the process plant.

A magnetic gear comprising:

• a casing;
• a stator mounted within the casing and including a winding system having separate windings and electrical connections between the separate windings configured such that the separate windings are able to be separately exited by out-of-phase electrical currents generated by a multiphase alternating current source and thereby to produce magnetic fields emanating from stator pole pairs of the separate windings rotating around the stator when the windings are connected to the multiphase alternating current source;
• a low speed rotor mounted within the casing for rotation, coaxial to and surrounded by the stator, the low speed rotor having a set of ferrous pieces situated opposite to the high speed stator and separated from one another by non-ferrous regions of the low speed stator so as to be able to conduct the magnetic fields produced by the stator;
• a high speed rotor mounted within the casing for rotation coaxial to the low speed rotor and telescoped within the low speed rotor, the high speed rotor having a set of pole pieces opposite to the ferrous pieces of the low speed rotor and the stator;
• and
• the set of ferrous pieces of the low speed rotor present in a number equal to a sum of the stator pole pairs of the stator and rotor pole pairs provided by the pole pieces of the high speed rotor so that motion of the ferrous pieces produced by the rotation of the low speed rotor in turn produces a gearing effect in which the high speed rotor rotates at a higher speed than the magnetic fields produced by the stator and in an opposite direction thereto.