SYSTEM AND METHOD FOR DETERMINING ANGULAR POSITION AND CONTROLLING ROTOR ORIENTATION
First Claim
1. A system for measuring the angular orientation of a rotor, said system comprising:
- a rotor assembly comprising a plurality of annularly disposed motor field pole magnetic domains;
a sensor module having at least two HEDs disposed at a specified relative angular separation with respect to each other, wherein the sensor module is suitably configured to produce a plurality of input signals in response to magnetic flux variation corresponding to axial rotation of the motor field pole magnetic domains; and
a position measurement module suitably configured to;
process said input signals to produce converted sinusoidal reference signals, wherein said sinusoidal reference signals have at least one of an offset scale factor and an amplitude scale factor;
determine an error term by processing said converted reference signals to produce a position estimate signal corresponding to an approximate measurement of angular orientation of the rotor; and
subsequently produce a refined measurement of angular orientation of the rotor by processing the error term.
1 Assignment
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Accused Products
Abstract
Methods and devices for determining the position and/or angular orientation of a rotating shaft. Exemplary features include a sensor module and a position determination module. Sensor module may include a plurality of Hall Effect devices (HEDs) arranged at a specified angular separation to produce a signal in response to rotation of the shaft. Position module may be responsive to sensor module to produce a converted signal, determine an error term, and produce a position estimate. Converted signal may be produced by processing the HED signals into sinusoidal reference signals having offset scale and amplitude scale factors. Error term may be determined by processing the converted signals to produce an estimated position signal. Position estimate may be produced by processing the error term. Refined position measurement may be achieved by iterative elimination of regressive differences between position estimates with minimization of absolute magnitude of error term.
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Citations
23 Claims
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1. A system for measuring the angular orientation of a rotor, said system comprising:
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a rotor assembly comprising a plurality of annularly disposed motor field pole magnetic domains;
a sensor module having at least two HEDs disposed at a specified relative angular separation with respect to each other, wherein the sensor module is suitably configured to produce a plurality of input signals in response to magnetic flux variation corresponding to axial rotation of the motor field pole magnetic domains; and
a position measurement module suitably configured to;
process said input signals to produce converted sinusoidal reference signals, wherein said sinusoidal reference signals have at least one of an offset scale factor and an amplitude scale factor;
determine an error term by processing said converted reference signals to produce a position estimate signal corresponding to an approximate measurement of angular orientation of the rotor; and
subsequently produce a refined measurement of angular orientation of the rotor by processing the error term. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring the angular orientation of a rotor, said method comprising the steps of:
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providing a rotor assembly comprising a plurality of annularly disposed motor field pole magnetic domains;
providing a sensor module having at least two HEDs disposed at a specified relative angular separation with respect to each other, wherein the sensor module is suitably configured to produce a plurality of input signals in response to magnetic flux variation corresponding to axial rotation of the motor field pole magnetic domains; and
providing a position measurement module suitably configured for;
processing said input signals to produce converted sinusoidal reference signals, wherein said sinusoidal reference signals have at least one of an offset scale factor and an amplitude scale factor;
determining an error term by processing said converted reference signals to produce a position estimate signal corresponding to an approximate measurement of angular orientation of the rotor; and
subsequently producing a refined measurement of angular orientation of the rotor by processing the error term. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for controlling an electric motor, said method comprising the steps of:
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providing a rotor assembly comprising a plurality of annularly disposed motor field pole magnetic domains;
providing a sensor module having at least two HEDs disposed at a specified relative angular separation with respect to each other, wherein the sensor module is suitably configured to produce a plurality of input signals in response to magnetic flux variation corresponding to axial rotation of the motor field pole magnetic domains;
providing a position measurement module suitably con figured for;
processing said input signals to produce converted sinusoidal reference signals, wherein said sinusoidal reference signals have at least one of an offset scale factor and an amplitude scale factor;
determining an error term by processing said converted reference signals to produce a position estimate signal corresponding to an approximate measurement of angular orientation of the rotor; and
subsequently producing a refined measurement of angular orientation of the rotor by processing the error term; and
providing a control module responsive to the position measurement module, wherein the control module is suitably configured to actuate at least two motor field pole magnetic domains for angular positioning of the rotor. - View Dependent Claims (20, 21, 22, 23)
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Specification