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US 2016/0109264 A1Published application
Apparatus and Method for Determining a Rotation Angle of a Rotor
AssigneeTDK-Micronas GmbH
InventorsMarc Baumann, Redouane Sadeq
Life of this patent
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Abstract
A method and an apparatus for determining a rotation angle of a rotor in a motor with the aid of angle sensors by measurement of reference values and correction of the effected computations. The method is used, for example, in a synchronous motor.
Claims10
A method for determining a rotation angle of a rotor with the aid of angle sensors in a motor, comprising:
- capturing of reference values by reading signal values from the angle sensors after the rotor was brought to a predetermined rotor position;
- measuring amplitude values of a magnetic field during at least one full revolution of the rotor;
- computing offset values of the angle sensors by forming an average value of peak values of the magnetic field;
- computing corrected amplitude values by subtraction of the offset values from the measured amplitude values;
- computing amplitude difference values from the difference of the peak values of the magnetic field;
- computing normalized/standardized amplitude values and of normalized/standardized reference values by division of the corrected amplitude values and the reference values with a divisor, corresponding to the half of the amplitude difference values;
- computing a correction angle by computing the ATAN value of the normalized/standardized reference values;
- and
- determining the rotation angle by computing the ATAN value of the normalized/standardized amplitude values in the X direction and in the Y direction and deduction of the correction angle.
6 more elements
An apparatus for determining the rotor position of a motor, comprising:
- at least one sensor for capturing a magnetic field value;
- and
- a processor for computing the rotor position, wherein the processor is configured to:
- capture of reference values by reading signal values from angle sensors after the rotor was brought to a predetermined rotor position;
- measure amplitude values of a magnetic field during at least one full revolution of the rotor;
- compute offset values of the angle sensors by forming an average value of peak values of the magnetic field;
- compute corrected amplitude values by subtraction of the offset values from the measured amplitude values;
- compute amplitude difference values from the difference of the peak values of the magnetic field;
- compute normalized/standardized amplitude values and of normalized/standardized reference values by division of the corrected amplitude values and the reference values with a divisor, corresponding to the half of the amplitude difference values;
- compute a correction angle by computing the ATAN value of the normalized/standardized reference values;
- and
- determine the rotation angle by computing the ATAN value of the normalized/standardized amplitude values in the X direction and in the Y direction and deduction of the correction angle.
9 more elements
A synchronous motor, comprising:
- a stator with a plurality of switchable coils;
- a rotor rotatably held in the stator;
- a permanent magnet mounted on an axle connected to the rotor;
- and
- an apparatus for determining the rotor position of a motor, comprising:
- at least one sensor for capturing a magnetic field value;
- and
- a processor for computing the rotor position configured to:
- capture of reference values by reading signal values from angle sensors after the rotor was brought to a predetermined rotor position;
- measure amplitude values of a magnetic field during at least one full revolution of the rotor;
- compute offset values of the angle sensors by forming an average value of peak values of the magnetic field;
- compute corrected amplitude values by subtraction of the offset values from the measured amplitude values;
- compute amplitude difference values from the difference of the peak values of the magnetic field;
- compute normalized/standardized amplitude values and of normalized/standardized reference values by division of the corrected amplitude values and the reference values with a divisor, corresponding to the half of the amplitude difference values;
- compute a correction angle by computing the ATAN value of the normalized/standardized reference values;
- and
- determine the rotation angle by computing the ATAN value of the normalized/standardized amplitude values in the X direction and in the Y direction and deduction of the correction angle.
14 more elements
Dependencies are inferred from the claim text.