Armature with quiet core construction

Details Armature with quiet core construction Armature with quiet core construction

1984-12-07

1986-10-07

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 51, 310269, H02K 100

Patent

active

046161511

ABSTRACT:
An armature for a DC motor comprises a laminated core defining poles extending generally axially, each pole comprising a body portion with a winding thereabout and a plurality of axially disposed tooth portions, each tooth portion exhibiting a primary skew of its laminations in one direction while the tooth portions of each pole exhibit a smaller secondary skew in the opposite direction. The primary skew is produced by arms extending circumferentially from radial body portions in consecutive laminations which become progressively longer on one side and shorter on the other side of the body portions. Magnetic force fluctuations between the armature and field magnets of the case are modified so as to produce less audible noise with armature rotation.

REFERENCES:
patent: 1861059 (1932-05-01), Johnson
patent: 2039547 (1936-05-01), Mikulic
patent: 2648788 (1953-08-01), Fleischer
patent: 3307059 (1967-02-01), Kitano
patent: 3586893 (1971-06-01), Okamoto
patent: 4126797 (1978-11-01), Kling
patent: 4264836 (1981-04-01), Dukshtau
patent: 4467234 (1984-08-01), Tahara
patent: 4489249 (1984-12-01), Oliver
"Effect of Skewing and Pole Spacing on Magnetic Noise in Electrical Machinery"; Mikina; ASME, vol. 5, 1934, pp. 711-720.

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