Torsional mass tuned damper
AssigneeDana Tm4 Inc.
InventorJean-Philippe Dextraze
Life of this patent
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Abstract
A mass tuned damper for electric machines, particularly those with an external rotor and an internal stator in cantilever arrangement. The mass tuned damper includes a body with a predetermined mass and a mounting mechanism with a predetermined rigidity configured to couple the body onto a mounting surface of the stator. The mass tuned damper is configured, by varying the mass of body and/or the rigidity of the mounting mechanism, to oscillate at a first frequency equal to, but at least partially out of phase with, a resonance frequency of the stator.
Claims12
A tuned mass damper for an electric machine having a rotor coaxially aligned with a stator, the damper comprising:
- a body;
- and
- a mounting mechanism configured to couple the body onto a mounting surface of the stator, the mounting mechanism configured with a rigidity, wherein the mounting mechanism comprises a plurality of openings that are evenly spaced along a periphery edge of the body;
- and
- wherein the rigidity permits the body to oscillate at a first frequency at least partially out of phase with the stator at a stator resonance frequency.
A tuned mass damper for an electric machine having a rotor coaxially aligned with a stator, the damper comprising:
- a body;
- and
- a mounting mechanism configured to couple the body onto a mounting surface of the stator, the mounting mechanism configured with a rigidity;
- wherein the rigidity permits the body to oscillate at a first frequency at least partially out of phase with the stator at a stator resonance frequency, and wherein the mounting mechanism comprises:
- a fastener configured for coupling the body onto the mounting surface;
- an opening formed on the body;
- and
- a compression element partially filling the opening and configured to receive the fastener therethrough;
- wherein, during stator resonance frequency, the body and the fastener cause the compression element to deform such that the body oscillates at the first frequency.
A tuned mass damper for an electric machine having a rotor coaxially aligned with a stator, the damper comprising:
- a first body fixedly coupled to a mounting surface of the rotor;
- a second body;
- a mounting mechanism comprising a compression element configured to couple the first and second bodies, wherein the mounting mechanism further comprises a plurality of openings that are unevenly spaced along a periphery edge of the second body;
- wherein the compression element is configured to permit the second body to oscillate at a first frequency at least partially out of phase with stator oscillation at a stator resonance frequency;
- and
- wherein the compression element is configured to be deformed during oscillations of the damper.
A tuned mass damper for an electric machine having a rotor coaxially aligned with a stator, the damper comprising:
- a body;
- a fastener configured to couple the body to a mounting surface of the stator;
- an insert mechanism configured to receive the fastener therethrough;
- and
- a compression element having a rigidity and is configured to permit the body to oscillate at a first frequency at least partially out of phase with stator oscillation at a stator resonance frequency;
- wherein the fastener is adjustable to vary a compressive force exerted onto the compression element by the insert mechanism thereby adjusting the rigidity of the compression element.
Dependencies are inferred from the claim text.