Title:
MAGNETIC POLE POSITION DETECTOR
Document Type and Number:
Japanese Patent JP3503375
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To detect the rotational position with high accuracy by equipping a detector with a low-pass filter which removes higher harmonic wave components by supplying the exciting coil wound on the magnetic poles in pair at the periphery of a stator with pulses in rectangular waveform, and adding the detecting value of the magnetic poles in a pair, where the phase of electric angle is slid by a specified angle to the detection value of the exciting current of the coil by the voltage, so as to rectify it.
SOLUTION: Arranging properly each pole tooth 1a and 2a of a magnetic pole m1 and a rotor 2 in the same-phase position will shift the several magnetic pole teeth 1a and 2a of a magnetic pole 3 and a rotor 2, a magnetic pole m5 and a rotor 2, and a magnetic pole 7 and a rotor 2 by 90°, 180°, and 270°, respectively, in electric angle phase. A signal generator outputs pulse signals to the several exciting coils of magnetic poles m1-m32, and two-phase sine waves that a low-pass filter has produced, removing the components of higher harmonic waves from the output signal of a synchronous rectifying circuit are used as the magnetic pole signals of a two-phase pulse motor. Consequently, even if the gap between several magnetic pole teeth of the stator and the rotor of a magnetic position measuring instrument changes, the rotational position of the pulse motor can be detected with high accuracy.
Inventors:
Yutaka Maeda
Application Number:
JP32895296A
Publication Date:
March 02, 2004
Filing Date:
December 09, 1996
Export Citation:
Assignee:
Shinko Electric Co., Ltd.
International Classes:
G01B7/30; G01B7/00; G01D5/245; H02K37/04; H02K37/06; H02P8/00; (IPC1-7): G01D5/245; G01B7/30; H02K37/04; H02K37/06; H02P8/00
Domestic Patent References:
| JP6312914A | ||||
| JP3162621A | ||||
| JP551087B2 |
Attorney, Agent or Firm:
Masatake Shiga (2 outside)