Device and method for measuring the position of a mobile part
AssigneeNeelogy
InventorLuc Lucien Marie Lenglet
Life of this patent
Estimating the term…
Abstract
A device for measuring the position of a mobile part (4), includes: at least one magnetic node (10) capable of modulating the amplitude of an excitation magnetic field according to the amplitude of a magnetic field to be measured, the magnetic node having a magnetic cycle for magnetic induction that depends on the hysteresis-free magnetic field in an operation range [Hmin; Hmax], and in which the magnetic cycle of the magnetic node (10) is characterised in that the absolute value of the third derivative of the magnetic induction relative to the magnetic field is maximal for a zero magnetic field.
Claims14
A device for measuring the position of at least a first moving part (4;
- 62;
- 64, 102), this device comprising:
- at least a first generator (8;
- 66;
- 108) for generating a first magnetic field to be measured, this first generator being fastened to the first moving part;
- at least one magnetic core providing means for capable of modulating the amplitude of an excitation magnetic field (Hex) as a function of the amplitude of the first magnetic field to be measured, this magnetic core having a magnetic induction cycle as a function of the magnetic field with no hysteresis within an operating range [Hmin;
- Hmax];
- and
- an electronic computer (44) providing means for determining the position of the first moving part relative to the magnetic core from the amplitude of a magnetic field induced in the magnetic core, this induced magnetic field resulting from the combination of the magnetic field to be measured and the excitation magnetic field,
- in which the magnetic cycle of the magnetic core (10;
- 110-113) is characterized in that the absolute value of the third derivative of the magnetic induction with respect to the magnetic field is a maximum for a zero magnetic field.
A method of measuring the position of a first moving part (4), this method comprising:
- the generation (48) of a first magnetic field to be measured by means of a field generator fastened to the first moving part (4);
- the provision of at least one magnetic core (10) providing means for modulating the amplitude of an excitation magnetic field as a function of the amplitude of the first magnetic field to be measured, this magnetic core having a magnetic induction cycle as a function of the magnetic field with no hysteresis within an operating range [Hmin;
- Hmax] ;
- and
- the determination (56) of the position of the first moving part (4) relative to the magnetic core from the amplitude of a magnetic field induced in the magnetic core (10), this induced magnetic field resulting from the combination of the first magnetic field to be measured and the excitation magnetic field,
- in which the magnetic cycle of the magnetic core (10) is characterized in that the absolute value of the third derivative of the magnetic induction with respect to the magnetic field is a maximum for a zero magnetic field.
Dependencies are inferred from the claim text.