ROTATION DETECTION DEVICE - TOSHIBA ELEVATOR KK

Title:

ROTATION DETECTION DEVICE

Document Type and Number:

WIPO Patent Application WO/2005/071423

Kind Code:

A1

Abstract:

It is possible to reduce torque ripple of a motor attributed to a rotation detection device. A frequency multiplier (51) multiplies a rotation angle Ѳ of a detection object by the ripple frequency m per one rotation of the detection object. An adder (53) adds a phase adjustment value &phgr from a phase adjustment unit (49) to mѲ. The sin(mѲ + &phgr ) calculated by a sine calculation unit (55) is multiplied by a predetermined gain G by an amplitude adjustment unit (57) and by an angular velocity &ohgr of the detection object by a multiplier (59). A subtractor subtracts an output of the multiplier (59) from the &ohgr and outputs &ohgr (1 - Gsin (mѲ + &phgr ). This output from the subtractor (61) and the output mѲ + &phgr from the adder (53) are introduced to the phase adjustment unit (49) and the amplitude adjustment unit (57). The phase adjustment unit (49) calculates the phase adjustment value &phgr according to the accumulated value of the differentiation values outputted from the subtractor (61) sampled for each &pgr /2 of output from the adder (53). The amplitude adjustment unit (57) calculates the gain G according to the accumulated value of the difference between the sample value average at 0, &pgr of the output of the adder (53) and the time integration average value at 0 to &pgr .

Inventors:

MORISHITA MIMPEI (JP)

Application Number:

PCT/JP2005/000873

Publication Date:

August 04, 2005

Filing Date:

January 24, 2005

Export Citation:

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Assignee:

TOSHIBA ELEVATOR KK (JP)
MORISHITA MIMPEI (JP)

International Classes:

G01D5/244; G01D5/245; G01P3/46; H02P7/00; H02P29/00; (IPC1-7): G01P3/46; H02P7/00

Foreign References:

JPH09113528A	1997-05-02
JPH10281809A	1998-10-23
JP2002199501A	2002-07-12

Other References: