Patent ID: 11860003
Assignee: NIDEC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A signal processing device, comprising:
a preprocessing circuit to generate N corrected detection signals from N detection signals, the N detection signals being output from sensors that are disposed so that the N detection signals are displaced in phase by an angle which is 360 degrees/N;
a signal processing circuit to generate and output a line segment joining signal to form a line, based on the N corrected detection signals; and
a storage medium being connected to the signal processing circuit and having stored thereon a computer program to control an operation of the signal processing circuit, wherein,
in accordance with instructions in the computer program, the signal processing circuit performs:
sequentially detecting a crossing at which two signals among the N corrected detection signals cross each other;
subdividing a corrected detection signal that links from a crossing to another crossing which is adjacent to that crossing into one or more segments, and detecting each segment as a subdivision signal;
reading, from a storage device, measurement data in which a value corresponding to each segment is associated with every segment; and
by referring to the measurement data, identifying a segment, based on a relationship among the N corrected detection signals that are defined by the line segment joining signal and on the subdivision signals.