Acoustical treatment for a rotor of a laundry appliance

An electric motor for a laundry appliance comprising:

• a stator having a plurality of windings that extend around teeth of the stator;
• a rotor positioned around the stator, wherein an electrical current delivered to the plurality of windings produces an electromotive force that rotationally operates the rotor about the stator at a predetermined range of rotational frequencies that includes a noise-producing natural frequency of the rotor;
• and
• a harmonic-modulating inertial ring that is attached directly to the rotor and that modulates the noise-producing natural frequency of the rotor to be a modulated natural frequency, wherein the predetermined range of rotational frequencies is free of the modulated natural frequency of the rotor.

An electric motor for a laundry appliance comprising:

• a stator having a plurality of windings that extend around teeth of the stator;
• a rotor positioned around the stator, wherein an electrical current selectively delivered to the plurality of windings produces an electromotive force that rotationally operates the rotor about the stator at a predetermined range of rotational frequencies that includes a noise-producing natural frequency of the rotor;
• and
• at least one harmonic-modulating concentric member that is attached directly to the rotor and that modulates the noise-producing natural frequency of the rotor to be a modulated noise-producing natural frequency, wherein the predetermined range of rotational frequencies is free of the modulated noise-producing natural frequency of the rotor, and wherein the at least one harmonic-modulating concentric member includes an outer inertial ring.