Method for the determination of the pressure in and/or of the through-flow through a pump
AssigneeLevitronix LLC
InventorsReto Schöb, Natale Barletta, Jürgen Hahn
Life of this patent
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Abstract
In the method for the determination of the pressure (p) in and/or of the through-flow (Q) of a liquid through a pump having at least one magnetic bearing for the axial journaling of the pump rotor (1), axial forces act on the rotor (1) of the pump during operation. The axial forces which act on the rotor are utilised for the determination of the pressure (p) and/or of the through-flow (Q).
Claims27
A method for the determination of one of through-flow (Q) of a liquid through a pump and through-flow (Q) as well as pressure (p) of a liquid in a pump the pump having a pump rotor, a drive rotor (1) and a drive stator (2), comprising the steps of:
- axially journaling the pump rotor and drive rotor (1) with at least one passive magnetic bearing;
- determining the magnetic drive flux (ΦM) in the gap between the drive rotor (1) and the stator (2);
- determining the drive current (IA);
- determining the drive torque (M) from the drive flux (ΦM) and the drive current (IA);
- and, determining the through-flow (Q) from the drive torque (M) and the speed of rotation (ω) of the rotor.
A method for the determination of one of pressure (p) of a liquid in a pump and pressure (p) as well as through-flow (Q) of a liquid through a pump, the pump having a pump rotor (1), comprising the steps of:
- axially journaling the pump rotor with at least one magnetic bearing;
- and,
- utilizing axial forces acting on the rotor (1) due to a pressure difference between the pump inlet side and the pump outlet side and speed of rotation (ω) to determine pressure (p).
A method for the determination of one of through-flow (Q) of a liquid through a pump and though-flow (Q) as well as pressure (p) of a liquid in a pump, the pump having a pump rotor (1), comprising the steps of:
- axially journaling the pump rotor (1) with at least one passive magnetic bearing;
- determining the axial deflection (z, Δz) of the rotor (1);
- determining the drive current (IA);
- determining the drive torque (M) from the drive current (IA) and the axial deflection (z, Δz) of the rotor (1);
- and,
- determining the through-flow (Q) from the drive torque (M) and the speed of rotation (ω) of the rotor.
Dependencies are inferred from the claim text.