Yoke of stepping motor and method for manufacturing the same

Details Yoke of stepping motor and method for manufacturing the same Yoke of stepping motor and method for manufacturing the same

1991-05-17

1992-12-08

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310257, 310 49A, H02K 1512

Patent

active

051700824

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: 3867658 (1975-02-01), Dochterman
patent: 4381465 (1983-04-01), Renkl et al.
patent: 4884333 (1989-12-01), Cooper et al.
patent: 5020211 (1991-06-01), Nakagawa et al.
patent: 5045739 (1991-09-01), Kuwahara

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