Shield for fan motor for reducing structureborne noise and the e

Details Shield for fan motor for reducing structureborne noise and the e Shield for fan motor for reducing structureborne noise and the e

1986-04-25

1987-04-28

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 89, H02K 524

Patent

active

046617310

ABSTRACT:
A tubeaxial type electrical cooling fan is constructed with two or more fan struts that extend across the open back of the fan to a circular support ring that supports the shaft of the motor, which in turn supports the fan blades. In such a structure, bending or flexing can occur in the fan struts which generate and transmit structureborne noise. In addition, these types of motors have a higher than desirable external magnetic field and noise may be generated by the bearings in the motor or in the resonance of other structural numbers. A nickel-iron shield is provided that fits over the supporting hub and the radial fan struts. An intermediate sound damping adhesive layer between the struts and the shield provides both a magnetic flux shielding and vibration damping of the structureborne noise.

REFERENCES:
patent: 3500083 (1970-03-01), Dochterman
patent: 3527969 (1970-09-01), Papst
patent: 3546504 (1970-12-01), Janssen et al.
patent: 4171937 (1979-10-01), Greenfield
patent: 4499391 (1985-02-01), Sakamoto

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