Method for manufacturing a yoke for a stepping motor

Details Method for manufacturing a yoke for a stepping motor Method for manufacturing a yoke for a stepping motor

1990-07-26

1991-06-04

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

310 45, 310154, 310257, H02K 1502

Patent

active

050202111

ABSTRACT:
In a method for manufacturing yokes (3, FIG. 1) to be used in a permanent magnet type stepping motor (10, FIG. 2), a surface-treated dead soft steel sheet such as nickel-plated steel sheet or aluminized steel sheet containing carbon in 0.01 wt. % or less is press-worked to form yoke (3) having plural pole teeth (3a, FIG. 1) on its inner periphery, and then the yoke is annealed in an inactive gas atmosphere in a temperature range of 750.degree.-820.degree. C. to remove residual stress, and permeability of the yoke is improved.

REFERENCES:
patent: 4381465 (1983-04-01), Renkl et al.
patent: 4884333 (1989-12-01), Cooper et al.

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