8 results about "Primary resonance" patented technology

The application discloses an electromagnetic coupling sensing device, a signal measuring method and an electronic device. A frequency generating module is configured to generate a set frequency signal; a first resonance module is configured to generate a primary resonance signal based on the set frequency signal; a second resonance module is configured to be connected with the first resonance module through a coupling capacitor to generate a secondary resonance signal based on the primary resonance signal; wherein the second resonance module comprises a coil arranged in a Z direction, a ferrite arranged in the coil, and the height of the coil is higher than the ferrite; the coil can bear a weight to be measured to generate a deformation to change the frequency of the secondary resonance signal; and a echo acquisition and processing module is configured to be connected with the second resonance module to acquire the secondary resonance signal and output a voltage signal changed according to the secondary resonance signal.

The utility model discloses a medium-voltage switch cabinet, which relates to the technical field of medium-voltage switch cabinets, and comprises a shell, a voltage transformer and a primary resonance elimination device, and an inner cavity is formed in the shell; the voltage transformer is mounted in the inner cavity, is used for being connected with an external power supply, and comprises a neutral point; one end of the primary resonance elimination device is electrically connected with the neutral point, the other end of the primary resonance elimination device is grounded, and the internal resistance of the primary resonance elimination device is smaller than or equal to 210 kilohms. Specifically, the primary resonance elimination device is connected in series to a neutral point of a primary winding of the voltage transformer, and then the primary resonance elimination device is grounded, so that the connection is completed; when the specification of the voltage transformer is 10KV, the internal resistance of the primary resonance elimination device is set to be smaller than or equal to 210k omega, so that the neutral point of the voltage transformer can be effectively grounded, the internal resistance can be ensured to be high enough while the resonance is eliminated, and the effect of eliminating the resonance is met.

An electromagnetic coupling sensing device includes a frequency generation module, a first resonant module, a second resonant module, and an echo acquisition and processing module. The first resonant module generates a primary resonant signal based on the frequency setting signal generated by the frequency generation module. The second resonant module couples with the first resonant module through a coupling capacitance to generate a secondary resonant signal based on the primary resonance signal. The second resonant module includes a coil. A ferrite is provided in the coil and a height of the coil is higher than the ferrite. The coil is capable of carrying a weight to be measured to deform such that an intrinsic frequency of the electromagnetic coupling sensing device changes. The echo acquisition and processing module collects the secondary resonant signal and outputs a voltage signal changing according to the intrinsic frequency.

To enable a primary resonance peak and a secondary resonance peak of an LC resonance phenomenon to be simultaneously reduced.SOLUTION: A rotary electric machine includes a rotor, and a stator having a stator core, a plurality of slots, and a stator winding. The stator core has 2n in-phase slots for each pole, phase windings of the same phase being accommodated in the in-phase slots, and the in-phase slots being consecutively arranged circumferentially. The phase winding includes 2m parallel windings for connecting respective phase terminals to a neutral point, and every 2T phase windings are accommodated in one in-phase slot to be arranged in a row in a radial direction. When the parallel windings are arranged from one in-phase slot to an in-phase slot of another adjacent magnetic pole, the parallel windings are shifted in the radial direction by one row and arranged on a second row to a 2t-1 row from an outer diameter side. The parallel windings are shifted in the radial direction by one row, or not shifted in the radial direction, and arranged on a first row and a 2t row from the outer diameter side. 2T=2k(P / m) is satisfied for the relationship of the number of windings in the in-phase slot (2T), the number of magnetic poles (2P), and the number of parallel windings (2m).SELECTED DRAWING: Figure 4

To provide a lightweight sound insulating panel having high sound insulating performance.SOLUTION: In the sound insulation panel 1 including the concavo-convex structure 2, a thickness T of a member constituting the concavo-convex structure 2 is 0.1 mm or more and 20 mm or less, a tensile modulus of elasticity of the member constituting the concavo-convex structure 2 is 0.1 GPa or more, a product of a primary resonance frequency f [Hz] of out-of-plane vibration of the sound insulation panel 1 and a side length L [m] is 80 [Hz·m] or more. A quotient of a height H [m] from the lowest part to the highest part of the uneven structure 2 and a side length L [m] is 0.01 or more and 0.7 or less, and a projected area ratio of a projected area excluding the uneven structure 2 to the whole projected area projected in the thickness direction is less than 20%.SELECTED DRAWING: Figure 1

The present application relates to the field of bulk acoustic wave resonators, and specifically relates to an edge structure and a filter. The edge structure comprises an edge protrusion structure provided between a bottom electrode and a top electrode of the edge structure. The edge protrusion structure comprises a first protrusion layer and a second protrusion layer stacked in a direction away from a substrate. The first protrusion layer is formed of a material having a high dielectric constant, and the second protrusion layer is formed of a material having a high acoustic resistance. Accordingly, the first protrusion layer should be located on the side close to the bottom electrode, and the second protrusion layer should be located on the side close to the top electrode. In this way, due to the presence of a metal material having high acoustic impedance, a high acoustic impedance mismatch can be achieved, thereby improving Rp. Moreover, due to the presence of the first protrusion layer, the electric field intensity of a second functional region and a third functional region outside a primary resonance region can be reduced, and secondary resonance can be suppressed, enabling the curve below spurious to be smooth.

An electromagnetic coupling sensing device includes a frequency generation module, a first resonant module, a second resonant module, and an echo acquisition and processing module. The first resonant module generates a primary resonant signal based on the frequency setting signal generated by the frequency generation module. The second resonant module couples with the first resonant module through a coupling capacitance to generate a secondary resonant signal based on the primary resonance signal. The second resonant module includes a coil. A ferrite is provided in the coil and a height of the coil is higher than the ferrite. The coil is capable of carrying a weight to be measured to deform such that an intrinsic frequency of the electromagnetic coupling sensing device changes. The echo acquisition and processing module collects the secondary resonant signal and outputs a voltage signal changing according to the intrinsic frequency.

An LLC resonance conversion circuit is provided. The LLC resonance conversion circuit includes a primary side network, a transformer, a primary side resonance circuit and a secondary side network. The transformer includes at least on coil and at least one excitation inductor. The primary side network includes a plurality of switch elements and an input capacitor. The primary resonance circuit includes at least one resonance capacitor, at least one resonance inductor and at least one auxiliary inductance. The resonance capacitor and the resonance inductor are connected in series between the coil and the primary side network. Two terminals of the excitation inductor are connected to the coil. The auxiliary inductance is connected to the resonance inductor. The secondary side network includes a plurality of switch elements and an output capacitor. The secondary network is connected to the coil.