About Inductcoder

INDUCTCODER of MURATEC by magnetic induction and phase detection method invented by original originality

INDUCTCODER of MURATEC is composed of the magnetic substance that moves in the conversion circuit, the first winding coil, the second winding coil, and the coil.

The exchange magnetic field is generated by exciting the first winding coil by the first exchange signal that becomes a standard. Because the magnetic substance moves in the winding coil two the second arranged at the position in the exchange magnetic field, two inducement outputs corresponding to each position of two coils are obtained.

1. The first winding coil is excited by the first exchange signal (aSinωt) from the conversion circuit. Two signals (aSinx·Sinωt/aCosx·Sinωt) with different crest value are output from the second winding coil according to the position of the magnetic substance.
   
   
2. The aSinx·Sinωt signal is shifted by 90 degrees and it is assumed aSinx·Cosωt.
   It is synthesized based on another signal aCosx·Sinωt and the additional theorem, and aSin(ωt±X) is obtained. The aSin·Sinωt signal is shifted by 90 degrees and it is assumed aSinx·Cosωt. The signal obtained thus becomes a signal that becomes a standard to which the phase shifts only by X.
   
   
3. The counter in LSI in the conversion part repeats start reset every one cycle based on the reference clock synchronizing with the first excitation signal. 0 crossing point of synthesized signal aSin(ωt±X) is detected, and the number of clock counts is output as the positional data.