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Three-phase cylindrical curved surface coil and an all-space wireless power transfer system based on it

A wireless power transmission, cylindrical technology, applied in circuit devices, electrical components, etc., can solve the problems of increasing the weight of the coupling mechanism, small size and weight of the pickup coil, and lack of it.

Active Publication Date: 2022-02-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional three-dimensional coil, the advantage of using crossed dipole coils is that the space volume is reduced, but the weight of the coupling mechanism is increased due to the introduction of the magnetic core.
[0005] It can be seen that there is currently a lack of a coupling mechanism and a wireless transmission system using the coupling mechanism, which can effectively reduce the output voltage fluctuation when the pickup coil changes in the full spatial orientation, and the volume and weight of the pickup coil are relatively small

Method used

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  • Three-phase cylindrical curved surface coil and an all-space wireless power transfer system based on it
  • Three-phase cylindrical curved surface coil and an all-space wireless power transfer system based on it
  • Three-phase cylindrical curved surface coil and an all-space wireless power transfer system based on it

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Experimental program
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Effect test

Embodiment 1

[0058] Embodiments of the present invention provide three-phase cylindrical curved surface coils, such as figure 1 As shown in the perspective view of (a) and the top view of (b), it includes A-phase coil windings (A1A2X1X2), B-phase coil windings (B1B2Y1Y2), and C-phase For the coil winding (C1C2Z1Z2), the enclosing angle of each phase coil winding itself is 180°, and the mechanical angle between any two phase coil windings is 120°. The coil windings of each phase are evenly distributed inside a cylinder (not shown) with a radius R and a height h.

Embodiment 2

[0060] This embodiment provides an excitation method for the three-phase cylindrical curved surface coil described in Embodiment 1, assuming that the excitation currents corresponding to the A-phase coil winding, the B-phase coil winding, and the C-phase coil winding are respectively I a , I b , I c .

[0061] According to the Biot-Savart law, the current element Idl located at (x, y, z) is at the field point (x0 ,y 0 ,z 0 ) The magnetic field strength generated at ) is:

[0062]

[0063] Among them, I represents the excitation current of the coil winding, and r represents the distance from the field point to the current element, that is, r=(x 0 -x,y 0 -y,z 0 -z). The magnetic field strength H can be decomposed into three components orthogonally on the x, y, and z axes, H=(H x ,H y ,H z ) can be expressed as:

[0064]

[0065] Define the angle γ between any point projected onto the xoy plane and the positive direction of the x-axis on each phase of the transmi...

Embodiment 3

[0081] An embodiment of the present invention provides an all-space wireless power coupling mechanism, such as Figure 5 The perspective view and top view shown in (a), (b) include the three-phase cylindrical curved surface coil described in embodiment 1, and also include a pickup coil; the pickup coil is installed at any angle of the three-phase cylindrical curved surface coil In the hollow area (magnetic field space).

[0082] Since the magnetic field generated by the three-phase cylindrical curved surface coil is mainly composed of the magnetic field in the x-axis direction (H x ) and the magnetic field in the y-axis direction (H y ) vector synthesis, and the magnetic field H in the z-axis direction z Therefore, in this embodiment, the pick-up coil is placed vertically (that is, the plane of the pick-up coil is always perpendicular to the xoy plane) to capture the magnetic field components in the x and y-axis directions. Let the radius of the pickup coil Rx be r and the ...

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Abstract

The invention relates to the technical field of wireless power transmission, and specifically discloses a three-phase cylindrical curved surface coil and a whole-space wireless power transmission system based on it. A cylindrical A-phase coil winding, B-phase coil winding, and C-phase coil winding, the enclosing angle of each phase coil winding itself is 180°, and the mechanical angle between any two phase coil windings is 120°. The advantage is that: when the current excitation of different phases is given to different coil windings, each coil winding generates a magnetic field in different directions. By controlling the excitation current, the entire three-phase cylindrical curved surface coil can generate a uniform and strong rotating magnetic field in all directions. The pick-up coil is placed The same voltage can be picked up at any position in the uniform rotating magnetic field, so that the output voltage fluctuation of the pickup coil is minimized when the overall spatial orientation changes, and a single-dimensional coil with a smaller volume and lighter weight is used as the receiving coil. coil.

Description

technical field [0001] The present invention relates to the technical field of wireless power transmission, in particular to a three-phase cylindrical curved coil, an excitation method for a three-phase cylindrical curved coil, a full-space wireless power coupling mechanism and a three-phase cylindrical curved coil All-space wireless power transfer system. Background technique [0002] In recent years, magnetically coupled wireless power transfer (MC-WPT) technology has been widely used in portable electronic devices [1], implanted medical devices [2], electric vehicles [3], underwater robots [4], etc. . However, for the wireless power supply requirements of mobile electronic devices distributed in various directions in space, the traditional wireless power supply system composed of a pair of loop coils cannot overcome the problem of angular rotation or position offset of the receiving end, and has been unable to meet the needs of distributed , multi-point, and large-scale...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/00H02J50/12
CPCH02J50/005H02J50/12
Inventor 孙跃冯天旭王智慧唐春森
Owner CHONGQING UNIV
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