Title:
整流する直流電動機の駆動軸の回転位置を測定する方法
Document Type and Number:
Japanese Patent JP2004528797
Kind Code:
A
Abstract:
A method for determining the position of a shaft of a commutated direct current (DC) motor based on the current ripples contained in an armature current signal includes digitally sampling the armature current signal to generate signal values at sampling points. The signal value corresponding to a current sampling point and selected signal values corresponding to previous sampling points in a time interval containing the sampling points are compared. Either a rising or falling slope detection signal is generated if the comparison is indicative of either an increasing or decreasing tendency in the magnitudes of the signal values. The rising and falling slope detection signals are respectively indicative of rising and falling current ripple slopes. A current ripple signal is generated if rising and falling slope detection signals are generated one after the other in a given period. The shaft position is determined based on the current ripple signal count.
Inventors:
Gerlach Tobias
Application Number:
JP2003501038A
Publication Date:
September 16, 2004
Filing Date:
May 29, 2002
Export Citation:
Assignee:
LEOPOLD KOSTAL GESELLSCHAFT MIT BESCHRANKTER HAFTUNG & COMPAGNIE KOMMANDITGESELLSCHAFT
International Classes:
H02P7/06; H02P6/18; H02P7/00; (IPC1-7): H02P7/06
Attorney, Agent or Firm:
Mitsufumi Esaki
Tsuneo Mihara
Okumura Yoshimichi
Blacksmith
Tsuneo Mihara
Okumura Yoshimichi
Blacksmith