Magnetic coupling with blocking monitoring

摘要

The magnetic coupling (1) comprises a drive rotor (11) which is provided with at least one first magnet (M1, M2). Located opposite the drive rotor (11), separated by a separating wall (partition wall) (19), is an output drive rotor (13) having at least one second magnet (M3, M4). A magnetic field sensor (21) is placed between the separating wall (19) and the plane in which the magnet (M1, M2) of the drive rotor (11) revolves. The magnetic field sensor (21) detects both the magnetic field of the first magnet (M1, M2) on the drive side and the magnetic field of the second magnet (M3, M4) on the output drive side. An evaluation circuit (23) which is connected is used to determine whether the output drive rotor (13) is blocked on the output drive side of the magnetic coupling (1). In the undisturbed case (non-defective state) the rotation angle of the magnetic coupling (1) can be determined from the measured magnetic field magnitude. If the magnetic coupling (1) is used in an implanted medication metering apparatus, the quantity of medication passed into the patient can be determined from this.