CA Patent: 145,515 - Dynamo electric machine


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CA Patent: CA-145,515

Dynamo electric machine

Patentee:

David Hall (exact or similar names) - Norwood, OH

USPTO Classifications:

Tool Categories:

electrical devices : electric motors : motor armatures

electrical devices : electric motors : motor windings

Assignees:

Bullock Electric Mfg. Co. - Norwood, OH

Allis-Chalmers Co. - Milwaukee, WI

Manufacturer:

Bullock Electric Mfg. Co. - Norwood, OH

Allis-Chalmers Co. - Milwaukee, WI

Witnesses:

Unknown

Patent Dates:
Applied:	Aug. 02, 1907
Granted:	Jan. 28, 1913

Patent Pictures:

CIPO Data
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Bullock Electric Mfg. Co.
Vintage Machinery entry for Allis-Chalmers Mfg. Co.

Description:

This double-commutator motor addresses a problem common to that type of device where a winding that happens to carry slightly more current will heat the brushes which causes lowered resistance and will then carry yet more current, and this positive feedback continues until the one winding carries nearly the entire load. The inventor adds auxiliary windings connected in a way to counteract this effect.