US 7,030,528 B2 · Dual concentric AC motor

Abstract

A dual concentric AC motor allows for two independently operating AC motors that produce the same torque at the same current input as two conventional, separate electric motors while occupying a smaller physical volume. The dual concentric AC motor utilizes a single, hollow cylindrical stator core comprising inner and outer stators and an inner rotor and an outer rotor that operate independently of one another. The inner stator, with windings that face toward the center of the motor, couples to the inner rotor, which rotates inside the single stator core, while the outer stator, with windings that face away from the center of the motor, couples to the outer rotor, which rotates around the single stator core. A back iron, centrally located in the single stator core, physically and magnetically separates the inner and outer stators. The two rotors are coupled to separate, independent output shafts.

Claims6

Dependent claims

A dual concentric electric motor comprising:

a hollow stator core having an axis;
a first rotor concentric with and positioned inside the hollow stator core and electrically driven by said hollow stator core;
a second rotor concentric with and positioned outside the hollow stator core and electrically driven by said hollow stator core;
a first motor shaft coupled to said first rotor;
a second motor shaft coupled to said second rotor;
and
wherein the hollow stator core comprises:
a hollow cylindrical inner stator;
a hollow cylindrical outer stator;
and
a nonmagnetic isolator positioned between and separating the inner stator and the outer stator.

8 more elements

Dependencies are inferred from the claim text.

Dual concentric AC motor

Life of this patent

Dual concentric AC motor

Life of this patent

Abstract

Claims6