Method of manufacturing a copper bar induction rotor

Details Method of manufacturing a copper bar induction rotor Method of manufacturing a copper bar induction rotor

1991-10-25

1993-02-16

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

310 45, 310211, H02K 1508

Patent

active

051859181

ABSTRACT:
An improved method of manufacture of a shorted turn copper bar rotor which is amenable to high volume production and which provides a copper-to-copper electrical bond among the conductor bar end turn portions at each end of the rotor core. Once the rotor core laminations have been assembled on the rotor shaft, and the conductor bars have been inserted into the core slots, a cylinder or spool element is positioned in abutment with each axial end of the core to define annular cavities into which the conductor bar end turn portions extend. Each cavity has a continuous opening for permitting access to the end turn portions lying therein, and a molten copper plasma is sprayed into the opening of each cavity, thereby forming a copper-to-copper electrical bond among the end turn portions extending from each end of the core. The ends of the assembly are then shortened as necessary by machining to provide the required current carrying capacity.

REFERENCES:
patent: 1160428 (1915-11-01), Markley
patent: 1695799 (1928-12-01), Daun
patent: 3826940 (1974-07-01), McKean et al.

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