HVAC blower motor

A Heating, Ventilation, and Air-Conditioning (HVAC) blower motor comprising:

• a stator comprising electromagnets configured to be energized at pre-determined energizing frequency;
• a rotor adapted to angularly move relative to the stator along an axis of rotation “A” of the HVAC blower motor extending in an axial direction due to pulsating magnetic field between the stator and the rotor, the rotor comprising:
• an output shaft centrally protruding from the rotor and configured to rotate therewith to deliver torque;
• a magnet holder centrally mounted along the axis of rotation “A” of the HVAC blower motor,
• a plurality of permanent magnets held within the magnet holder are configured to interact with the cyclically energized electromagnets of the stator to cause the pulsating magnetic field between the stator and the rotor to cause angular movement of the rotor with respect to the stator,
• wherein the magnet holder of the rotor comprises a strip of vibration damping material secured thereto along an outer periphery of the magnet holder to change the frequency characteristic of pulsating vibration to which the magnet holder is subjected to,
• wherein the strip of vibration damping material comprises at least one strip of viscoelastic asphaltic blend with a heat bondable film applied on at least one side of the strip of viscoelastic asphaltic blend, and
• wherein the strip of viscoelastic asphaltic blend is having following properties:
• a specific gravity of 1.60 to 1.85 kg/m3,
• a solid content of 99 to 100 percent,
• exhibition of peel adhesion,
• cohesive failure when exposed to heat aging at 70° C. for 2 weeks,
• 100% humidity at 38° C. for 250 hours and environmental cycle of 6 weeks.

A Heating, Ventilation, and Air-Conditioning (HVAC) blower motor comprising:

• a stator comprising electromagnets configured to be energized at pre-determined energizing frequency;
• a rotor adapted to angularly move relative to the stator along an axis of rotation “A” of the HVAC blower motor extending in an axial direction due to pulsating magnetic field between the stator and the rotor, the rotor comprising:
• an output shaft centrally protruding from the rotor and configured to rotate therewith to deliver torque;
• a magnet holder centrally mounted along the axis of rotation “A” of the HVAC blower motor,
• a plurality of permanent magnets held within the magnet holder are configured to interact with the cyclically energized electromagnets of the stator to cause the pulsating magnetic field between the stator and the rotor to cause angular movement of the rotor with respect to the stator,
• wherein the magnet holder of the rotor comprises a strip of vibration damping material secured thereto along an outer periphery of the magnet holder to change the frequency characteristic of pulsating vibration to which the magnet holder is subjected to,
• wherein the strip of vibration damping material comprises at least one strip of viscoelastic asphaltic blend with a heat bondable film applied on at least one side of the strip of viscoelastic asphaltic blend, and
• wherein the heat bondable film is a nitrile phenolic based thermoplastic bonding film.