Absolute encoder avoiding magnetic interference

Details Absolute encoder avoiding magnetic interference Absolute encoder avoiding magnetic interference

1997-03-10

1999-07-20

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68E, 310 67R, 310 68R, H02K 706

Patent

active

059259531

ABSTRACT:
A correcting signal generator 42 stores the quantitative relation of the magnetic interference between the rotation angle .theta.3 of a resolver 23 and the detected values A3, B3 of a resolver 22, and outputs the correcting values A8, B8 for the magnetic interference according to the rotation angle .theta.3. An adder 41 calculates and outputs the corrected detection values A4, B4 by adding the correcting values A8, B8 to the detected values A3, B3 of the resolver 22 output from a latch circuit 14. A resolver rotation angle calculation circuit 47 calculates and outputs an angle .theta.2 by taking an arc tangent of the quotient A4/B4 of the corrected detection values A4, B4. In the same way, a correcting signal generator 44 calculates and outputs the angle .theta.3.

REFERENCES:
patent: 4572951 (1986-02-01), Toda et al.
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patent: 5032750 (1991-07-01), Hayashi
patent: 5260650 (1993-11-01), Schwesig et al.
patent: 5393201 (1995-02-01), Okutani et al.
patent: 5710509 (1998-01-01), Goto et al.
patent: 5739775 (1998-04-01), Brandestini

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