Method and a device for sensorless estimating the relative angular position between the stator and rotor of a three-phase synchronous motor
AssigneeGTI Electroproject B.V.
InventorAndre Veltman
Life of this patent
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Abstract
A method for sensorless estimation of the relative position between the stator and the rotor of a three-phase synchronous motor during operation. The method comprises the steps of low-pass filtering of the terminal voltage, low-pass filtering of the terminal current, high-pass filtering of the terminal current and determining the rotor speed. Next the relative angular position is determined from the filtered magnitudes and corrected with an angular correction derived from the rotor speed.
Claims17
A method for sensorless estimation during operation of a three-phase synchronous motor, comprising a stator, having a stator winding comprising terminals for connecting terminal voltage and terminal current, and a magnetic rotor, of the relative position between said stator and said rotor, said method comprising the steps of:
- low pass-filtering the terminal voltage;
- low-pass filtering the terminal current;
- high-pass filtering the terminal current;
- determining a rotor speed of the magnetic rotor;
- and
- determining the relative angular position from the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current, and correcting the determined relative angular position with angular correction derived from said rotor speed.
Dependencies are inferred from the claim text.