Pump with rotor position measurement system
First Claim
1. A pump comprising an electrical motor drive (2) and a pump engine (3), the pump engine having a stator portion (32) and an axially and rotatably movable rotor portion (30) mounted in the stator portion and having an inlet and an outlet, the electrical motor drive comprising a rotor (6) with a permanent magnet (20), a stator (4) with a magnetic circuit (10) and one or more coils (18), and a position sensor (8) comprising at least a pair of magnetic field detectors (24a, 24h) positioned in the proximity of the rotor permanent magnet opposite an axial end (36) of the rotor permanent magnet and configured such that the signal phase offset between the pair of magnetic field detectors is 90°
- to detect both rotational and axial movement of the rotor.
3 Assignments
0 Petitions
Accused Products
Abstract
A pump comprising an electrical motor drive (2) and a pump engine (3), the pump engine having a stator portion (32) and an axially and rotatably movable rotor portion (30) mounted in the stator portion. The electrical motor drive comprises a rotor (6) with a permanent magnet (20), a stator (4) with a magnetic circuit (10) and one or more coils, and a position sensor (8) comprising at least one magnetic field detector (24a, 24b) positioned in the proximity of the rotor permanent magnet and configured to detect both rotational and axial movement of the rotor.
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Citations
15 Claims
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1. A pump comprising an electrical motor drive (2) and a pump engine (3), the pump engine having a stator portion (32) and an axially and rotatably movable rotor portion (30) mounted in the stator portion and having an inlet and an outlet, the electrical motor drive comprising a rotor (6) with a permanent magnet (20), a stator (4) with a magnetic circuit (10) and one or more coils (18), and a position sensor (8) comprising at least a pair of magnetic field detectors (24a, 24h) positioned in the proximity of the rotor permanent magnet opposite an axial end (36) of the rotor permanent magnet and configured such that the signal phase offset between the pair of magnetic field detectors is 90°
- to detect both rotational and axial movement of the rotor.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of detecting occlusion or leakage of a pump comprising a position sensor, said method comprising performing an initial measurement comprising turning the rotor in a forward pumping direction at least one revolution and storing an axial displacement as a function of a rotation displacement profile in a look-up table as a stored cam profile, measuring the axial displacement as a function of the rotation displacement during subsequent pumping and comparing the measured axial displacement with the stored cam profile, wherein the pump comprises an electrical motor drive (2) and a pump engine (3), the pump engine having a stator portion (32) and an axially and rotatably movable rotor portion (30) mounted in the stator portion and having an inlet and an outlet, the electrical motor drive comprising a rotor (6) with a permanent magnet (20), a stator (4) with a magnetic circuit (10) and one or more coils (18), and a position sensor (8) comprising at least a pair of magnetic field detectors (24a, 24b) positioned in the proximity of the rotor permanent magnet opposite an axial end (36) of the rotor permanent magnet and configured such that the signal phase offset between the pair of magnetic field detectors is 90°
- to detect both rotational and axial movement of the rotor.
- View Dependent Claims (11, 12, 13)
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14. A method of removing gas bubbles or detecting leakage in a pump comprising an electrical motor drive (2) and a pump engine (3), the pump engine comprising a stator portion (32) and an axially and rotatably movable rotor portion (30) mounted in the stator portion and having an inlet valve (V1) and an outlet valve (v2), the method including applying a back and forth displacement of the rotor over an angle less than 180°
- while applying an axial force on the rotor, wherein the pump comprises an electrical motor drive (2) and a pump engine (3), the pump engine having a stator portion (32) and an axially and rotatably movable rotor portion (30) mounted in the stator portion and having an inlet and an outlet, the electrical motor drive comprising a rotor (6) with a permanent magnet (20), a stator (4) with a magnetic circuit (10) and one or more coils (18), and a position sensor (8) comprising at least a pair of magnetic field detectors (24a, 24b) positioned in the proximity of the rotor permanent magnet opposite an axial end (36) of the rotor permanent magnet and configured such that the signal phase offset between the pair of magnetic field detectors is 90°
to detect both rotational and axial movement of the rotor. - View Dependent Claims (15)
- while applying an axial force on the rotor, wherein the pump comprises an electrical motor drive (2) and a pump engine (3), the pump engine having a stator portion (32) and an axially and rotatably movable rotor portion (30) mounted in the stator portion and having an inlet and an outlet, the electrical motor drive comprising a rotor (6) with a permanent magnet (20), a stator (4) with a magnetic circuit (10) and one or more coils (18), and a position sensor (8) comprising at least a pair of magnetic field detectors (24a, 24b) positioned in the proximity of the rotor permanent magnet opposite an axial end (36) of the rotor permanent magnet and configured such that the signal phase offset between the pair of magnetic field detectors is 90°
Specification