Alternating current sensor based on magnetoelectric laminate material and with C-type magnetic ring

Abstract

The invention discloses an alternating current sensor based on a magnetoelectric laminar composite and with a C-type magnetic ring, which belongs to the field of alternating current sensors. The alternating current sensor is a closed cyclic structure composed of the C-type magnetic ring and a measuring module in the gap of the C-type magnetic ring. The C-type magnetic ring and the measuring module are detachably connected through a supporting layer. The measuring module is in a layered structure and comprises the magnetoelectric laminate material in the middle and a permanent magnet layer arranged symmetrically in the thickness direction of the magnetoelectric laminate material. The cross section of the C-type magnetic ring and the permanent magnet layer completely cover the cross section of the magnetoelectric laminate material. The sensor is simple to use, can be loaded and unloaded at any time without changing the topology of a line to be measured, and is a passive device. The output voltage of the sensor has a good linear relationship with the amplitude of current to be measured. The alternating current sensor can realize wideband measurement and has good anti-interference ability.

Description

technical field [0001] The invention relates to the field of alternating current sensors, in particular to an alternating current sensor with a C-shaped magnetic ring based on a magnetoelectric layered composite material. Background technique [0002] In the field of current detection, the two most common methods are mutual induction coils or Hall current sensors, but each of them has some shortcomings: the mutual induction coil must be connected to the circuit to be tested in advance, and when it is necessary to temporarily measure the main circuit in operation , the main circuit must be disconnected first, and then resume work after the mutual induction coil is connected to the main circuit, which is not conducive to installation and maintenance; the Hall current sensor is an active device, and requires an external power supply to provide a constant DC current for it to work. In addition, the current sensor can also be made of magnetoelectric layered composite materials. T...

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Problems solved by technology

[0002] In the field of current detection, the two most common methods are mutual induction coils or Hall current sensors, but each of them has some shortcomings: the mutual induction coil must be connected to the circuit to be tested in advance, and when it is necessary to temporarily measure the main circuit in operation , the main circuit must be disconnected first, and then resume work after the mutual induction coil is connected to the main circuit, which is not conducive to installation and maintenance; the Hall current sensor is an active device, and the external power supply is required to provide it with a constant DC current during operation.

[0005] In these studies, although the current sensors based on the annular magnetoelectric laminated materials can complete the current detection task and have high measurement sensitivity, there are two shortcomings: one is that it is difficult to make an opening structure, and the load The current wire must pass through the sensor ring, which brings some inconvenience to the installation and maintenance of the sensor, that is, when installing or maintaining the sensor, the main circuit has to be disconnected first, and then the power-off threading operation is carried out; The ring structure of the electrical laminate greatly limits the measurable current range, and usually only limits the measurement of AC currents below 1A, which is lacking in the detection of currents in the order of amperes to hundreds of amperes.

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