A variable inductor of which variable inductance characteristics can be adjusted is provided. The inductor includes: a magnetic core having a preset shape; and a coil part surrounding a portion of the magnetic core and generating a magnetic flux depending on a current flow, wherein the magnetic core includes a first magnetic region formed of a first magnetic material and a second magnetic region formed of a second magnetic material different from the first magnetic material.

A transformer includes a bobbin, a primary coil, and a pair of secondary coils. The bobbin has an axial bore formed therein. The primary coil is wound on the bobbin and is adapted to be electrically excited with an excitation signal. The secondary coils are disposed adjacent to the primary coil, and are inductively coupled to the primary coil upon electrical excitation of the primary coil. The primary coil is wound on the bobbin such that at least a portion of the primary coil has a cross section shape that is a trapezoid.

A transformer includes a bobbin, a primary coil, and a pair of secondary coils. The bobbin has an axial bore formed therein. The primary coil is wound on the bobbin and is adapted to be electrically excited with an excitation signal. The secondary coils are disposed adjacent to the primary coil, and are inductively coupled to the primary coil upon electrical excitation of the primary coil. The primary coil is wound on the bobbin such that at least a portion of the primary coil has a cross section shape that is a trapezoid.

A transformer position sensor includes a primary coil, a secondary coil, and an electrically shorted coil. The primary coil is adapted to receive an excitation signal and is configured, upon receipt of the excitation signal, to generate a primary magnetic flux. The secondary coil is inductively coupled to the primary coil upon electrical excitation of the primary coil, and includes a plurality of differentially wound coils. The electrically shorted coil is inductively coupled to receive at least a portion of the primary magnetic flux generated by the primary coil. The electrically shorted coil is configured, upon receipt of at least a portion of the primary magnetic flux, to generate a magnetic flux that opposes the primary magnetic flux.

The present disclosure provides a full inductor core configured for use with a power converter of an energy management system. For example, the full inductor core comprises a first planar inductor comprising a first inner core and a first outer core and a second planar inductor disposed on top of the first planar inductor and comprising a second inner core and a second outer core. The first inner core and first outer core and the second inner core and second outer core each have a sawtooth configuration that allows the full inductor core to be tuned during assembly of the full inductor core.

A representative phase-shift based method for using a transformer system to detect movement of an object, and associated systems and methods are disclosed. A representative transformer system detects movement of an object and includes an excitation coil configured to receive an excitation coil input signal that results from an input sinusoidal signal. The transformer further includes first and second sensing coils, and a core configured to be operatively coupled to the object. The core moves relative to the first and second sensing coils when the object moves. First and second impedance loads are connected to the first and second sensing coils, respectively. The two impedance loads have different phase-shifting characteristics. A phase-shift sensing circuit determines a phase-shift between the excitation coil input signal and the input sinusoidal signal that is correlated with a position of the core relative to the first and second sensing coils.

A current limiter comprises a plurality of electrically conductive wires shaped to define two or more primary coils, the primary coils being connected in parallel; and at least one electrically superconductive element shaped to define a secondary coil, wherein the primary coils are magnetically coupled to the or each secondary coil.

The present invention relates to a device for the contact-free inductive transfer of electrical energy from a first, preferably stationary system of a shifting device into a second system of the shifting device, which can be moved relative to the first system, comprising a magnetic circuit of a primary core, which is assigned to the first system and onto which a primary coil is wound, and a secondary core, which is assigned to the second system and onto which a secondary coil is wound. The secondary core is arranged so as to be capable of being shifted relative to the primary core along a shifting path, which preferably runs parallel to a shifting path of the shifting device. The primary core extends at least along the entire length of the shifting path. According to the invention, provision is made for the primary core to comprise at least one primary core gap, which is embodied along the entire longitudinal extension of the primary core. The invention further relates to a shifting device, in particular a linear shifting device, comprising such an energy transfer device as well as to a method for operating such a device.

The present invention relates to a device for the contact-free inductive transfer of electrical energy from a first, preferably stationary system of a shifting device into a second system of the shifting device, which can be moved relative to the first system, comprising a magnetic circuit of a primary core, which is assigned to the first system and onto which a primary coil is wound, and a secondary core, which is assigned to the second system and onto which a secondary coil is wound. The secondary core is arranged so as to be capable of being shifted relative to the primary core along a shifting path, which preferably runs parallel to a shifting path of the shifting device. The primary core extends at least along the entire length of the shifting path. According to the invention, provision is made for the primary core to comprise at least one primary core gap, which is embodied along the entire longitudinal extension of the primary core. The invention further relates to a shifting device, in particular a linear shifting device, comprising such an energy transfer device as well as to a method for operating such a device.

A device for inductive energy transfer between a stationary three-phase primary system and a mobile three-phase secondary system shows a stationary iron core part and two mobile iron core parts (3, 5) which are connected electrically in series are each designed as an equilateral triangle or as a star which spans an equilateral triangle and has limbs (3a, 3b, 3c; 5a, 5b, 5c) of equal length which run at the same angle in relation to one another, and supporting posts (3a, 3b, 3c; 5a, 5b, 5c) which start from the ends of said limbs, and also primary and secondary windings (4, 6) which are arranged at the same distance from one another. The device of simple design has a high degree of efficiency in respect of energy transfer. In the case of energy transfer only in the inoperative state, a stationary iron core part and a mobile iron core part can also be positioned directly one on the other without magnetic rails.