CN105355402B - Adjustable inductor device and adjusting method thereof - Google Patents

Abstract

The invention discloses an adjustable inductor device and an adjusting method thereof. The device comprises n driver plates, m horizontally-moving driving rods, n driving steering mechanisms, n motors and a controller. Coils are wound around the driver plates. Each driver plate is provided with m holes, wherein m/n holes are threaded holes, and the rest of the holes are polished holes. The surface of one end of each horizontally-moving driving rod is engraved with a thread with a certain length. Each hole in each driver plate corresponds to the corresponding horizontally-moving driving rod. The threaded end of each horizontally-moving driving rod sequentially penetrates through corresponding holes in the n driver plates and is only matched with the corresponding driver plates through the threaded holes. The controller controls the motors to rotate and drives the corresponding horizontally-moving driving rods to move horizontally through the driving steering mechanisms, the horizontally-moving driving rods then drive the corresponding driver plates to move leftwards and rightwards through the threads, and therefore gaps between the coils are changed, inductance and distribution capacitance values of the coils are changeable, resonance frequency is fixed, and the device and the method are suitable for high-frequency and high-power occasions.

Description

An adjustable inductance device and its adjusting method

technical field

The invention belongs to the field of magnetic resonance coupling wireless power transmission, and in particular relates to an adjustable inductance device.

Background technique

Magnetic resonance was proposed by researchers in MIT's Department of Physics, Department of Electrical Engineering, Computer Science, and Military Nanotechnology Institute. The system uses two resonant objects of the same frequency to generate strong mutual coupling, and the energy interacts between the two objects. The coil and the plate capacitors placed at both ends form a resonant circuit together to realize wireless transmission of energy. In June 2007, researchers from the Massachusetts Institute of Technology realized the transmission of 60W power at a distance of 2 meters through electromagnetic coils. They adopted a new way of thinking, using two copper coils that can achieve resonance, and rely on resonance for energy transmission.

The resonant coil is the energy transmitting and receiving inductive element of the magnetic resonance coupling wireless power transmission system. The resonant coil is essentially an inductor with distributed capacitance. The constant frequency control of the coil is particularly critical for efficient energy transmission and reception. Looking at the existing structure-based inductance coil adjustment technology, there are three main methods:

The first method is mainly based on the adjustment of the position of the magnetic core, changing the use of the inductance and the magnetic core. This method is suitable for low-frequency applications and is not suitable for high-frequency magnetic resonance power transmission systems.

The second type uses magnetostriction to achieve movement. This mechanical structure adjusts the inductance relatively accurately, but it can only be adjusted at equal intervals. Magnetic interference.

The third way is to adjust the inductance through the piezoelectric stretch structure, which is also only suitable for fine-tuning at equal intervals, with limited adjustment ability, and the piezoelectric system is also easily disturbed by high-power magnetic fields.

It can be seen that the existing inductance technology based on structural adjustment is more suitable for use in low-power and weak magnetic fields, but there are obvious defects in high-frequency and high-power magnetic resonance coupling power transmission.

Contents of the invention

In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide an adjustable inductance device and its adjustment method, which can adjust the uneven change distribution of the coil gap, realize the adjustable coil inductance and distributed capacitance, and keep the resonance frequency constant at the same time , suitable for high frequency and high power occasions.

In order to realize above-mentioned technical purpose, technical scheme of the present invention is:

An adjustable inductance device, including n dials, m translational drive rods, n drive direction change mechanisms, n motors and a controller, coils are wound on each dial, where m is an integer multiple of n; each There are m holes on each dial, among which m/n holes are threaded holes, and the rest are smooth holes. The surface of one end of each translational driving rod is engraved with a certain length of thread, and the rest of the surface is smooth; Each hole of each corresponds to a translational driving rod, and the threaded end of each translational driving rod passes through the corresponding holes on the n dials in turn, and all the translational driving rods are parallel to each other; m/n threaded holes have the same diameter as the translational drive rods passing through them, and each translational drive rod has the same diameter as only 1 threaded hole out of the n holes it passes through, and the remaining n-1 The diameters of the holes are all larger than the translational driving rods, and each translational driving rod can drive the dials with threaded holes of the same diameter through threads; the n drive direction change mechanisms correspond to the n dials and n motors respectively. , each drive change mechanism is in contact with the corresponding motor, and is arranged on the smooth surface of the translation drive rod capable of driving the dial corresponding to the drive change mechanism, and the control ends of the n motors are respectively connected to the controller; The controller controls the rotation of the motor, and drives the corresponding translational driving rod to translate through the driving direction changing mechanism, and the translational driving rod moves the corresponding dial left and right through the thread, thereby changing the gap between the coils and realizing the adjustment of the inductance.

Wherein, m is twice of n, that is, the diameters of the two holes on each dial are the same as the diameters of the translational drive rods passing through these two holes.

Wherein, the driving direction changing mechanism includes a worm gear, a large gear and 2 small gears, one end of the worm gear is sleeved on the corresponding motor, the other end is fitted with the large gear, and the 2 small gears They are respectively arranged on the smooth surfaces of the two translational drive rods that can drive the corresponding dial of the driving direction change mechanism, and the two small gears are fitted with the large gear. When the motor rotates, the worm gear drives the large gear to rotate, and the large gear rotates. The gear drives two small gears to rotate, and the two small gears respectively drive two translational driving rods to translate, thereby driving the corresponding dial to move left and right.

Wherein, the device also includes several brackets, which are arranged at both ends of the translational driving rod and at the junction of the threaded surface and the smooth surface of the translational driving rod.

Among them, except for the motor and the coil, the other components of the device are made of non-metallic materials.

Wherein, the controller adopts a single-chip microcomputer.

The present invention also includes an adjustment method based on the above adjustable inductance device, the steps are as follows:

(1) The controller sends a driving signal to each motor to move all the dials to a predetermined position to achieve positioning calibration;

(2) According to the required resonance frequency, group all dials, divide n dials into x groups in sequence, and every n/x dials form a group, and order the grouped dials into the first Group 1 to Group x;

(3) Set the gap between each group of dials, the controller drives the motor to rotate according to the set gap, thereby driving the dial to move, so that each group of dials reaches the set gap, so that the inductance of the coil and The distributed capacitance is variable, while the resonant frequency is fixed.

The beneficial effect brought by adopting the above-mentioned technical scheme:

The present invention controls and adjusts the dials so that the gaps between the dials are unevenly distributed, so that the change amount of the inductance and the distributed capacitance increases and decreases in a reverse nonlinear manner, and the capacitance decreases when the inductance increases or the capacitance increases when the inductance decreases. During the change process, the product of the inductance of the coil and the distributed capacitance is kept constant. Therefore, the inductance and distributed capacitance of the coil are variable, and the resonant frequency is fixed. The invention is suitable for high-frequency and high-power occasions.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the translational driving rod in the present invention.

Explanation of symbols: 1. support frame; 2. dial; 3. drive direction change mechanism; 4. translation drive rod; 5. motor; 6. coil; 7. worm gear; 8. pinion; 9. large gear.

detailed description

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

The structure diagram of the present invention shown in Fig. 1, a kind of adjustable inductance device, comprises n dials 2, m translation drive rods 4, n drive direction changing mechanisms 3, n motors 5 and controllers, coils 6 Winding on each dial, where m is an integer multiple of n; each dial has m holes, of which m/n holes are threaded holes, and the rest are light holes. The surface of one end of each translational drive rod Engraved with threads of a certain length, the rest of the surface is smooth; each hole on each dial corresponds to a translation drive rod, and the threaded end of each translation drive rod passes through the corresponding holes on n dials in turn , all translational driving rods are parallel to each other; the diameter of the m/n threaded holes on each dial is the same as the diameter of the translational driving rods passing through them, and the diameter of each translational driving rod is only the n number of threaded holes it passes through. The diameter of one threaded hole in the holes is the same, and the diameters of the remaining n-1 holes are all larger than the translational drive rod, and each translational drive rod can drive a dial with a threaded hole of the same diameter through the thread; the n drive The direction changing mechanism is in one-to-one correspondence with n dials and n motors, and each driving direction changing mechanism is in contact with the corresponding motor, and is arranged on the smooth surface of the translational drive rod that can drive the corresponding dial of the driving direction changing mechanism Above, the control ends of the n motors are respectively connected to the controller; the controller controls the rotation of the motors, and drives the corresponding translation drive rod to translate through the driving direction change mechanism, and the translation drive rod then moves the corresponding dial left and right through the screw thread, Thereby changing the gap between the coils to realize the adjustment of the inductance.

In this embodiment, m is twice of n, that is, the diameters of the two holes on each dial are the same as the diameters of the translational drive rods passing through these two holes. When the two translational drive rods are translated, The dial is driven to move left and right by the friction between the hole and the thread.

In this embodiment, the driving direction changing mechanism 3 includes a worm gear 7, a large gear 9 and 2 small gears 8, one end of the worm gear is sleeved on the corresponding motor, and the other end is connected to the large gear. The two small gears are respectively arranged on the smooth surfaces of the two translational drive rods that can drive the corresponding dial of the drive change mechanism, and the two small gears are fitted with the large gear. When the motor rotates, The worm gear drives the large gear to rotate, the large gear drives two small gears to rotate, and the two small gears respectively drive two translational driving rods to translate, thereby driving the corresponding dial to move left and right.

In this embodiment, the device also includes several brackets 1, these brackets are arranged at the two ends of the translational driving rod and the junction of the threaded surface and the smooth surface of the translational driving rod, these brackets are used to support the translational driving rod, and can Limit the movement of the dial to a certain range.

In this embodiment, except for the motor and the coil, other parts of the device are made of non-metallic materials, thereby reducing the influence of materials on inductance.

In this embodiment, the controller adopts a single-chip microcomputer.

The present invention also includes an adjustment method based on the above adjustable inductance device, the steps are as follows:

(1) The controller sends a driving signal to each motor to move all the dials to a predetermined position to achieve positioning calibration;

(2) According to the required resonance frequency, group all dials, divide n dials into x groups in sequence, and every n/x dials form a group, and order the grouped dials into the first Group 1 to Group x;

(3) Set the gap between each group of dials, the controller drives the motor to rotate according to the set gap, thereby driving the dial to move, so that each group of dials reaches the set gap, so that the inductance of the coil and The distributed capacitance is variable, while the resonant frequency is fixed.

In the present invention, by controlling the uneven change of the gap between the dial and the dial, the distance between the coil and the coil is unevenly distributed, resulting in the reverse nonlinear increase and decrease of the change amount of the inductance and the distributed capacitance, and the capacitance increases when the inductance increases. When the capacitance decreases or the inductance decreases, the capacitance increases, and the following relationship is satisfied during this change process: (L ± ΔL) × (C ∓ ΔC) = LC ∓ LΔC ± ΔLC − ΔLΔC = LC (wherein, L represents inductance, C represents capacitance, ΔL represents the inductance increment, and ΔC is the capacitance increment), that is, by adjusting the uneven change of the gap, ∓LΔC ± ΔLC − ΔLΔC = 0, keeping the product of the inductance of the coil and the distributed capacitance constant, so that the coil’s The values of inductance and distributed capacitance are variable, and the resonant frequency is fixed.

The above embodiments are only to illustrate the technical ideas of the present invention, and cannot limit the protection scope of the present invention with this. All technical ideas proposed according to the present invention, any changes made on the basis of technical solutions, all fall within the protection scope of the present invention. Inside.

Claims (5)

1. a kind of controllable impedance device, it is characterised in that：Including n driver plate, m driven in translation bar, n driving side steering, n Individual motor and controller, coil is wrapped on each driver plate, and wherein m is the integral multiple of n；M hole is provided with each driver plate, wherein There is m/n hole to be screwed hole, remaining is unthreaded hole, the screw thread of certain length is carved with the surface of every driven in translation bar one end, remaining Surface is smooth；1 driven in translation bar is corresponded to respectively per 1 hole on each driver plate, the end of thread of every driven in translation bar is successively The corresponding hole through on n driver plate, is parallel to each other between all driven in translation bars；M/n screwed hole on each driver plate Diameter it is identical with the diameter through their driven in translation bar, the n hole that the diameter of every driven in translation bar is only passed through with it In 1 screwed hole diameter it is identical, the diameter in remaining n-1 hole is all higher than the driven in translation bar, and each driven in translation bar can The driver plate of the screwed hole for being provided with same diameter is driven by screw thread；Described n drives side steering individual with n driver plate and n respectively Motor is corresponded, and each drives side steering to contact with corresponding motor, and is arranged on and can drive the driving side steering On the smooth surface of the driven in translation bar of corresponding driver plate, the control end of the n motor is connected respectively with controller；Controller Controlled motor is rotated, and drives corresponding driven in translation bar translation, driven in translation bar to pass through screw thread again by driving side steering Corresponding driver plate is moved left and right, so as to change the gap between coil, the regulation of inductance is realized；The device also includes several Frame, these supports are arranged on the flank and the intersection of shiny surface of the two ends of driven in translation bar and driven in translation bar；It is described Controller adopts single-chip microcomputer.

2. a kind of controllable impedance device according to claim 1, it is characterised in that：M is 2 times of n, i.e., have 2 on each driver plate The diameter in individual hole is identical with the diameter of the driven in translation bar through this 2 holes.

3. a kind of controllable impedance device according to claim 2, it is characterised in that：The driving side steering includes 1 snail Worm and gear, 1 gear wheel and 2 little gears, one end of the worm and gear is enclosed within correspondence motor, and the other end is intended with gear wheel Close, 2 little gears are separately positioned on the light of the 2 driven in translation bars that can drive the corresponding driver plate of driving side steering On sliding surface, and 2 little gears are fitted with gear wheel, and when motor is rotated, worm and gear drives bull gear drive, gear wheel 2 pinion rotations are driven, 2 little gears drive respectively 2 driven in translation bar translations, so as to drive corresponding driver plate or so to move It is dynamic.

4. a kind of controllable impedance device according to claim 1, it is characterised in that：The device in addition to motor and coil, its Remaining part part is made by non-metallic material.

5. the control method of controllable impedance device described in claim 1-4 any one is based on, it is characterised in that including following step Suddenly：

(1) controller sends drive signal to each motor, and all driver plates are moved to into a precalculated position, realizes positioning calibration；

(2) resonant frequency as needed, all driver plates are grouped, and n driver plate is sequentially divided into into x groups, per n/x driver plate For one group, by the driver plate after packet successively sequencing for the 1st group to xth group；

(3) gap between every group of driver plate is set, controller is rotated according to the gap drive motor of setting, so as to drive driver plate to move It is dynamic, the gap that setting is reached between every group of driver plate is made, so that the inductance and distribution capacity of coil are variable, and resonant frequency is solid It is fixed.