Method for determining the position of an armature
AssigneeSiemens Aktiengesellschaft
InventorsStefan Butzmann, Joachim Melbert
Life of this patent
Estimating the term…
Abstract
An electromechanical actuating drive includes at least one electromagnet with a coil and an armature having an armature plate that can move between a first contact surface on the electromagnet and a second contact surface. The position of the armature is determined as a function of the magnetic flux (Φ) and the current (IS) through the coil.
Claims4
A method for determining the position of an armature associated with an electromechanical actuating drive, the actuating drive having a first contact surface and at least one electromagnet with a coil and a second contact surface, the armature having an armature plate movably disposed between the first contact surface and the second contact surface, the method which comprises:
- determining a mean value of a measured voltage drop across a coil in an operating state in which a substantially constant current is flowing through the coil;
- determining a resistance of the coil as a function of the mean value of the measured voltage drop and the current through the coil;
- determining an inductive voltage drop across the coil from a difference between the measured voltage drop across the coil minus a voltage drop obtained by multiplication of the resistance of the coil by the current through the coil;
- determining a magnetic flux by integration of the inductive voltage drop across the coil;
- and
- determining a position of an armature as a function of the magnetic flux and the current through the coil.
A method for determining the position of an armature associated with an electromechanical actuating drive, which comprises:
- providing an electromechanical actuating drive having an armature, a first contact surface, at least one electromagnet with a coil and a second contact surface, the armature having an armature plate movably disposed between the first contact surface and the second contact surface;
- determining a mean value of a measured voltage drop across the coil in an operating state in which a substantially constant current is flowing through the coil;
- determining a resistance of the coil as a function of the mean value of the measured voltage drop and the current through the coil;
- determining an inductive voltage drop across the coil from a difference between the measured voltage drop across the coil minus a voltage drop obtained by multiplication of the resistance of the coil by the current through the coil;
- determining a magnetic flux by integration of the inductive voltage drop across the coil;
- and
- determining a position of the armature as a function of the magnetic flux and the current through the coil.
Dependencies are inferred from the claim text.