Rotor position indicator with correction for apparant acceleration and deceleration

In a system for measuring the angle of a rotating rotor having a reference position and a plurality of markings spaced about the rotor, an angle measuring device for indicating the position of the rotor relative to the reference position, comprising:

• sensor means for detecting the rotor markings and generating a sensor signal in response thereto;
• indicator means, responsive to said sensor signal, for generating a position signal indicative of the angular position of the rotor relative to the reference position, said indicator means including means for correcting said position signal in response to each sensor signal;
• and
• wherein said correction means includes means for forcing said position signal to stall.

In a system for measuring the angle of a rotating rotor having a reference position and a plurality of markings spaced about the rotor, an angle measuring device for indicating the position of the rotor relative to the reference position, comprising:

• sensor means for detecting the rotor markings and generating a sensor signal in response thereto;
• indicator means, responsive to said sensor signal, for generating a position signal indicative of the angular position of the rotor relative to the reference position, said indicator means including means for correcting said position signal in response to each sensor signal;
• and
• wherein said indicator means includes means for measuring the time between sensor signals and comparison means for comparing at least one of said measured times against at least one predetermined value and wherein said correction means is responsive to said comparison means.

An arrangement for actuating an external event in a predictive manner according to the angular position of a rotating rotor having a plurality of spaced markings thereon, the arrangement comprising:

• first sensor means for generating a reference signal indicative of a reference position of the rotor;
• second sensor means for detecting the markings and generating a sensor signal in response thereto;
• indicator means, responsive to said sensor signal, for generating a present position signal indicative, at least in part, of the relative number of markings, and including correction means for correcting said position signal by appropriately spurting and stalling the position signal in response to each sensor signal;
• calculation means, responsive to said present position signal and said reference signal, for calculating a position signal indicative of a future predetermined position of the rotor;
• means, responsive to said present position signal and said calculated position signal, for actuating the external event when said present position signal indicates that the present position of the rotor is equal to the predetermined position of the rotor.

An arrangement for actuating an external event in a predictive manner according to the angular position of a rotating rotor having a plurality of spaced markings thereon, the arrangement comprising:

• first sensor means for generating a reference signal indicative of the position of the rotor;
• second sensor means for detecting the markings and generating a sensor signal in response thereto;
• indicator means, responsive to said sensor signal, for generating a present position signal indicative, at least in part, of the relative number of markings detected by said second sensor, said indicator means including:
• interpolation means, responsive to said sensor signals, for indicating of the relative angular position between sensor signals, and
• correction means, responsive to said interpolation means and to said sensor signals, for correcting said position signal by appropriately spurting and stalling the position signal;
• calculation means, responsive to said present position signal and said reference signal, for calculating a position signal indicative of a future predetermined position of the rotor;
• means, responsive to said present position signal and said calculated position signal, for actuating the external event when said present position signal indicates that the present position of the rotor is equal to the predetermined position of the rotor.