Patent ID: 8207870
Filing Date: 2012-06-26
Classification: G01D,H03M

Abstract:
1. An apparatus for sensing a rotor position, comprising: an absolute position sensor for sensing absolute position information for a rotor; a pulse generator for generating increment pulses with a predetermined period; a rotor position estimating unit for calculating the rotor position using the absolute position information and the number of the increment pulses counted in synchronization with the absolute position information at the time of sampling, wherein the rotor position estimating unit re-calculates the calculated rotor position by adding one or more increment values to the number of the increment pulses if the number of the increment pulses equals the number of increment pulses at the time of just previous sampling; and an output unit for generating a signal having information concerning the calculated rotor position or the re-calculated rotor position, wherein the increment value is proportional to the rotor rotation speed and the sampling period.