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A sensor system includes a coil positioned on a thin substrate sandwiched to a layer of mumeta, a high magnetic permeability material. The mumetal acts as an amplifier for the inductance L measured at the terminals of the coil. When a magnet passes in front a sheet of mumetal, its magnetic field loc

A sensor system includes a coil positioned on a thin substrate sandwiched to a layer of mumeta, a high magnetic permeability material. The mumetal acts as an amplifier for the inductance L measured at the terminals of the coil. When a magnet passes in front a sheet of mumetal, its magnetic field locally saturates the mumetal whose magnetic permeability collapses on the saturated surface. The result is a reduction of the inductance factor (L) in proportion with that area of the coil covered by the saturated mumetal. This reduction in inductance is measured at the coil terminals to provide an estimation of that area of the coil that has been covered. By determining a particular layout of the coil, mumetal, and magnet, a predetermined electrical signal of inductance or coupling variations corresponding to movement of the magnet is provided.

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A sensor system includes a coil positioned on a thin substrate sandwiched to a layer of mumeta, a high magnetic permeability material. The mumetal acts as an amplifier for the inductance L measured at the terminals of the coil. When a magnet passes in front a sheet of mumetal, its magnetic field loc

A sensor system includes a coil positioned on a thin substrate sandwiched to a layer of mumeta, a high magnetic permeability material. The mumetal acts as an amplifier for the inductance L measured at the terminals of the coil. When a magnet passes in front a sheet of mumetal, its magnetic field locally saturates the mumetal whose magnetic permeability collapses on the saturated surface. The result is a reduction of the inductance factor (L) in proportion with that area of the coil covered by the saturated mumetal. This reduction in inductance is measured at the coil terminals to provide an estimation of that area of the coil that has been covered. By determining a particular layout of the coil, mumetal, and magnet, a predetermined electrical signal of inductance or coupling variations corresponding to movement of the magnet is provided. machine in the absence of control, between the preceding sampling time and the current sampling time, and a second term dependent on said set point torque and a set point for the magnetic energy consumed by said machine, and determining, at each sampling time based on said discrete control law, the control voltage to be applied to said machine for the torque of said machine to reach said set point torque and the magnetic energy consumed by said machine to correspond to said set point magnetic energy, wherein said machine is a synchronous machine with surface-mounted permanent magnets, wherein, when said machine is rotating at a speed less than a predefined threshold, said method includes implementing a low-speed strategy consisting of determining said control voltage to be applied to said machine to reach said set point torque at said next sampling time with zero magnetic energy input, and wherein said low-speed strategy consists of applying the following discrete control law: where Ik,d0is said component of said free evolution of said stator current along the axis d of the system of axes (d, q) fixed with respect to said free evolution of said rotor flux during the sampling period between said sampling times k-1 and k, "a" is a constant, |Φk0|corresponds to the modulus of said free evolution of said rotor flux at said next sampling time k, and ΔΓkrepresents the difference between said electromagnetic torque of said machine to be reached at said next sampling time k and said component of free evolution of said torque at said time. 6. A method of regulating a rotating electrical machine, receiving as input a discrete control voltage determined to control the electromagnetic torque delivered by said machine to a set point torque, by determining at each sampling time said discrete control voltage to be applied to said machine as a function of at least one sampled signal representing the electromagnetic torque of said machine, so that the set point torque is reached at the next sampling time, said method comprising: determining a discrete voltage control law of said machine in which said discrete control voltage to be applied at each sampling time is determined in the form of a first term corresponding to free evolution of the state of said machine in the absence of control, between the preceding sampling time and the current sampling time, and a second term dependent on said set point torque and a set point for the magnetic en