Apparatus and method for generating two-phase signals for use wi

Details Apparatus and method for generating two-phase signals for use wi Apparatus and method for generating two-phase signals for use wi

1988-01-11

1988-12-27

Salce, Patrick R.

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

By passive phase shift elements

336 79, 336135, 310168, 318661, 341116, H02M 506, H01F 3300, G05B 106

Patent

active

047945117

ABSTRACT:
Two-phase voltage signals for use with a resolver-to-digital converter (RDC) are produced as a periodic function of permeance developed across an air gap between a rotor and stator wherein the permeance varies as a periodic sinusoidal function which can be related to the electrical angle of the position of the rotor. The two-phase voltage signals are developed as a function of inductive reactance and follow the form ##EQU1## wherein the phase angle between V.sub.x and V.sub.y is exactly 90.degree. and the term [A+A.sub.n +B+B.sub.n ] is completely free of second harmonics.

REFERENCES:
patent: 3123785 (1964-03-01), Moller
patent: 3641467 (1972-02-01), Ringland et al.
patent: 3705343 (1972-12-01), Ringland et al.
patent: 4255682 (1981-03-01), Toida et al.
patent: 4631510 (1986-12-01), Nagarkatti et al.
patent: 4700189 (1987-10-01), Welburn
patent: 4733117 (1988-03-01), Perrins

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