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    • 5. 发明专利
    • METHOD AND APPARATUS FOR DETECTING POSITION
    • JPH07336979A
    • 1995-12-22
    • JP12395194
    • 1994-06-06
    • NIPPON SEIKO KK
    • EZUKA YASUHIRO
    • G01B7/00G01D5/245G05B19/35H02K24/00
    • PURPOSE:To make a very precise detection of positions with a small speed ripple even if the number of rotations of a resolver is large. CONSTITUTION:Exciting signals which are 120 deg. out of phase from each other are formed on the basis of a counted value of a ring counter 1 and they are supplied to a phase detection resolver 4. The output of the resolver 4 is compared with a zero level by a comparator 5 and a rectangular waveform position data before correction thetaF is formed and then it is supplied to a digital delay circuit 6. In the delay circuit 6, the data thetaF is delayed according to a position correction value DELTAtheta from a ROM10 for correcting a position and then the position data after correction thetaB is output. The position data after correction is supplied to a latch circuit 7 which latches the counted value of the ring counter 1 and to a speed detecting circuit 8 to obtain the position data thetaP and the speed data DELTAT of the resolver 4. These two data are added and then the added value is supplied to the ROM10 for correcting a position as address data. On the other hand, the speed data DELTAT is converted to pulses by means of a pulse generator 11 and then the pulses are integrated by an integrating counter 12 and thereby positions of movable members are detected.