JP2022121048A - Rotary power transmission device, and, non-contact power transmission system - Google Patents

Abstract

To provide a rotary power transmission device capable of transmitting power of a plurality of systems.SOLUTION: A rotary power transmission device includes a cylindrical primary iron core, a first primary coil, a second primary coil, a cylindrical or columnar secondary iron core, a first secondary coil and a second secondary coil. The first primary coil is provided on an inner periphery of the primary iron core, and supplied with power from an AC power source. The second primary coil is provided separately from the first primary coil on the inner periphery of the primary iron core and connected to the first primary coil electrically in parallel. The secondary iron core is provided inside the primary iron core and rotatable relatively to the primary iron core, the first primary coil, and the second primary coil. The first secondary coil is provided on an outer periphery of the secondary iron core and at a position opposed to the inside of the first primary coil. The second secondary coil is provided on the outer periphery of the secondary iron core and at a position opposed to the inside of the second primary coil.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD Embodiments of the present invention relate to a rotary power transmission device and a contactless power transmission system.

A rotary power transmission device is known that rotates a secondary core with respect to a primary core around a common central axis, and transmits power from a coil wound around the primary core to a coil wound around the secondary core without contact. It is

Japanese Patent Application Laid-Open No. 2008-141112

A problem to be solved by the present invention is to provide a rotary power transmission device capable of transmitting power of a plurality of systems, and a contactless power transmission system having the rotary power transmission device.

According to the embodiment, the rotary power transmission device includes a tubular primary core, a first primary coil, a second primary coil, a tubular or columnar secondary core, and a first secondary coil. and a second secondary coil. The first primary coil is provided on the inner peripheral surface of the primary iron core and is supplied with power from an AC power supply. The second primary coil is provided separately from the first primary coil on the inner peripheral surface of the primary iron core and electrically connected in parallel to the first primary coil. A secondary core is provided inside the primary core and is rotatable relative to the primary core, the first primary coil, and the second primary coil. The first secondary coil is provided at a position facing the inside of the first primary coil on the outer peripheral surface of the secondary core. The second secondary coil is provided at a position facing the inside of the second primary coil on the outer peripheral surface of the secondary core.

FIG. 2 is a schematic cross-sectional view along the central axis of the rotary power transmission device according to the embodiment; FIG. 2 is a schematic diagram showing a cross section along the central axis of the rotary power transmission device; FIG. 2 is a schematic circuit configuration diagram of a rotary power transmission device; The schematic diagram which shows the cross section along the central axis of the rotary power transmission apparatus which concerns on a modification. Schematic which shows a non-contact electric power transmission system.

An embodiment of a rotary power transmission device (hereinafter referred to as a power transmission device) 10 will be described with reference to FIGS. 1 to 3. FIG.

FIG. 1 shows a schematic cross-sectional view of the power transmission device 10. As shown in FIG. FIG. 2 shows a schematic diagram of the power transmission device 10. As shown in FIG. FIG. 3 shows a schematic circuit configuration diagram of the power transmission device 10. As shown in FIG.

The power transmission device 10 shown in FIGS. 1 and 2 includes a primary assembly 12, a secondary assembly 14, a support frame 16, and an impeller 18. As shown in FIG.

The primary side assembly 12 is connected to the primary side circuit 22 shown in FIG. 3 through unillustrated conductors, and the secondary side assembly 14 is connected to the secondary side circuits 24 and 26 shown in FIG. 3 through unillustrated conductors. It is

As shown in FIGS. 1 and 2, in this embodiment, the primary side assembly 12 and the secondary side assembly 14 are each formed in a substantially cylindrical shape. Primary assembly 12 and secondary assembly 14 are arranged concentrically about a common central axis C0. Primary assembly 12 is positioned outside secondary assembly 14 .

The primary side assembly 12 includes a cylindrical primary iron core (core) 32, a first primary coil C11 provided on the inner peripheral surface of the primary iron core 32, and a second primary coil C11 provided on the inner peripheral surface of the primary iron core 32. and a primary coil C12.

As an example, the primary core 32 has a diameter of about 400 mm, a length of about 400 mm along the central axis C0, and a substantially cylindrical external appearance.

The central axis of the primary core 32 is coaxial with the central axis C0. One cross section of the primary core 32 along the central axis C0 is, for example, substantially E-shaped. Since the primary core 32 is formed symmetrically with respect to the central axis C0, the primary core 32 has two annular recesses 34 and 36 that open toward the central axis C0. The recess 34 is formed near the upper end (one end) of the primary core 32 in FIGS. 1 and 2 , and the recess 36 is formed near the lower end (other end) of the primary core 32 . The primary core 32 is made of a magnetic material such as ferrite or silicon steel.

The first primary coil C<b>11 is arranged annularly around the central axis C<b>0 in the concave portion 34 of the inner peripheral surface of the primary core 32 . The second primary coil C12 is spaced from the first primary coil C11 in the recess 36 of the inner peripheral surface of the primary iron core 32 and arranged annularly around the central axis C0. Therefore, the first primary coil C11 and the second primary coil C12 are separated in the direction along the central axis C0. The first primary coil C11 and the second primary coil C12 are made of a conductive material (conductor) such as copper wire. The first primary coil C11 is wound with an appropriate number of turns N11 around the central axis C0. The second primary coil C12 is wound with an appropriate number of turns N12 around the central axis C0.

As shown in FIG. 3, an AC power supply 20 is connected to terminals of the first primary coil C11. The terminals of the second primary coil C12 are connected to the AC power supply 20 so as to be electrically connected in parallel with the first primary coil C11.

The secondary side assembly 14 includes a cylindrical secondary core (core) 42, a first secondary coil C21 provided on the outer peripheral surface of the secondary core 42, and a secondary coil C21 provided on the outer peripheral surface of the secondary core 42. and a second secondary coil C22. The secondary core 42 is made of a magnetic material such as ferrite or silicon steel. In this embodiment, the length of the secondary core 42 along the central axis C<b>0 is substantially the same as the length of the primary core 32 . A cross section of one of the secondary cores 42 along the central axis C0 is, for example, substantially E-shaped. Since the secondary core 42 is formed symmetrically with respect to the central axis C0, the secondary core 42 has two annular recesses 44 and 46 that open radially outward with respect to the central axis C0. have. The recess 44 is formed near the upper end (one end) of the secondary core 42 in FIGS. 1 and 2, and the recess 46 is formed near the lower end (the other end) of the secondary core 42 . The concave portions 44 and 46 of the secondary core 42 open toward the side opposite to the central axis C0. Therefore, the recessed portion 34 of the primary core 32 and the recessed portion 44 of the secondary core 42 face each other in the radial direction with respect to the central axis C0, and the recessed portion 36 of the primary core 32 and the recessed portion 46 of the secondary core 42 are aligned with the central axis C0. diametrically opposed to the

The first secondary coil C21 is arranged annularly around the central axis C0 at a position opposed to the inside of the first primary coil C11 in the recess 44 of the outer peripheral surface of the secondary iron core 42 . The second secondary coil C22 is arranged annularly around the central axis C0 at a position opposed to the inside of the second primary coil C12 in the recess 46 of the outer peripheral surface of the secondary core 42 . Therefore, the first secondary coil C21 and the second secondary coil C22 are spaced apart in the direction along the central axis C0. The first secondary coil C21 and the second secondary coil C22 are made of a conductive material (conductor) such as copper wire.

The second secondary coil C22 is provided at a position near the lower end (other end) in FIGS. The first secondary coil C21 is wound with an appropriate number of turns N21 around the central axis C0. The second secondary coil C22 is wound with an appropriate number of turns N22 around the central axis C0.

The gap (distance) G between the inner peripheral surface of the primary core 32 and the outer peripheral surface of the secondary core 42, the gap (distance) between the first primary coil C11 and the second primary coil C12, the first The gap (distance) between the secondary coil C21 and the second secondary coil C22 can be appropriately set. As described above, when the diameter of the primary core 32 is about 400 mm and the length along the central axis C0 is about 400 mm, the gap between the inner peripheral surface of the primary core 32 and the outer peripheral surface of the secondary core 42 is, for example, It is about 10 mm. In addition, the diameter of the secondary core 42 is about 275 mm as an example.

As shown in FIG. 2, the power transmission device 10 of the present embodiment forms a first transformer 52 with a primary core 32, a first primary coil C11, a first secondary coil C21, and a secondary core 42. , the primary core 32, the first secondary coil C21, the second secondary coil C22, and the secondary core 42 form a second transformer . The first transformer 52 and the second transformer 54 are arranged side by side along the central axis C0.

The support frame 16 supports a first support assembly 62 that supports the top ends (one end) of the primary assembly 12 and the secondary assembly 14 and a bottom end (the other end) of the primary assembly 12 and the secondary assembly 14 . It has a second support assembly 64 and a tubular magnetic shield 66 provided between the first support assembly 62 and the second support assembly 64 .

The first support assembly 62 includes a first fixture 72 integrally secured to one end of the primary core 32, a second fixture 74 integrally secured to one end of the secondary core 42, and a second fixture 74 integrally secured to one end of the secondary core 42. A first bearing 76 provided between one fixing bracket 72 and a second fixing bracket 74, a first fixing bracket 72, a second fixing bracket 74, and a first bearing 76 covering the first bearing 76 1 cover 78 . For the first fixture 72 and the second fixture 74, a magnetic shielding material such as permalloy is used.

The first fixing bracket 72 and the second fixing bracket 74 are each formed, for example, in an annular shape. The outer peripheral surface of the first bearing 76 is fixed to the first fixing bracket 72 , and the inner peripheral surface of the first bearing 76 is fixed to the second fixing bracket 74 .

The first cover 78 is, for example, annular. A first cover 78 is fixed to the first fixture 72 . A first cover 78 covers the first fixture 72 , the second fixture 74 and the first bearing 76 . The inner peripheral surface of the first cover 78 is slidable on the outer peripheral surface of the second fixture 74 . Also, the first cover 78 is spaced from the inner ring of the first bearing 76 .

The impeller 18 is fixed to the second fixing bracket 74 . Impeller 18 is mounted on secondary core 42 , ie, secondary assembly 14 .

The second support assembly 64 includes a third fixture 82 integrally secured to the other end of the primary core 32 and a fourth fixture 84 integrally secured to the other end of the secondary core 42 . , a second bearing 86 provided between the third fixture 82 and the fourth fixture 84, the third fixture 82, the fourth fixture 84, and the second bearing 86. and a second cover 88 for covering. For the third fixture 82 and the fourth fixture 84, a magnetic shielding material such as permalloy is used.

The third fixing bracket 82 and the fourth fixing bracket 84 are each formed, for example, in an annular shape. The outer peripheral surface of the second bearing 86 is fixed to the third fixing metal fitting 82 , and the inner peripheral surface of the second bearing 86 is fixed to the fourth fixing metal fitting 84 .

The second cover 88 is, for example, annular. A second cover 88 is fixed to the third fixture 82 . A second cover 88 covers the third fixture 82 , the fourth fixture 84 and the second bearing 86 . The inner peripheral surface of the second cover 88 is slidable on the outer peripheral surface of the fourth fixture 84 . Also, the second cover 88 is spaced from the inner ring of the second bearing 86 .

A magnetic shield 66 is provided between the first bracket 72 of the first support assembly 62 and the third bracket 82 of the second support assembly 64 . Permalloy, for example, is used for the magnetic shield 66 .

FIG. 3 shows an example of a power transmission circuit using the power transmission device 10. As shown in FIG. An AC power supply 20 is connected to the first primary coil C<b>11 and the second primary coil C<b>12 of the power transmission device 10 . A load RL1 is connected to the first secondary coil C21. A load RL2 is connected to the second secondary coil C22.

Between the AC power supply 20 and the first primary coil C11, and between the AC power supply 20 and the second primary coil C12, a phase advancing capacitor C is arranged to reduce the reactive current and improve the power factor. ing.

The operation of the power transmission device 10 will be described with reference to FIGS. 1 to 3. FIG.

Using appropriate power, the secondary core 42 of the secondary assembly 14 of the power transmission device 10 is rotated with respect to the primary core 32 of the primary assembly 12 about the central axis C0. While rotating the secondary core 42 with respect to the primary core 32 , the AC power supply 20 outputs, for example, a sinusoidal single-phase AC voltage (eg, 100 V) to the power transmission device 10 . An AC power supply 20 supplies a current to the first primary coil C11 and the second primary coil C12 of the primary side assembly 12 to generate a magnetic field as indicated by broken lines in FIG.

Assuming that the input voltage of the AC power supply 20 is Vin, the first transformer 52 satisfies N11/Vin=N21/Vout1, and the second transformer 54 satisfies N12/Vin=N22/Vout2. Therefore, when a current is passed through the first primary coil C11 with the input voltage Vin from the AC power supply 20, a current flows through the first secondary coil C21 facing the first primary coil C11 due to electromagnetic induction. Therefore, an appropriate output voltage Vout1 is obtained between the terminals of the first secondary coil C21. Therefore, the power of the output voltage Vout1 is transmitted from the first primary coil C11 to the first secondary coil C21 in a non-contact manner. Similarly, when current is applied to the second primary coil C12 with the voltage Vin from the AC power supply 20, electromagnetic induction causes current to flow to the second secondary coil C22 facing the second primary coil C12. Therefore, an appropriate output voltage Vout2 is obtained between the terminals of the second secondary coil C22. Therefore, the power of the output voltage Vout2 is transmitted from the second primary coil C12 to the second secondary coil C22 in a non-contact manner. When the power transmission device 10 is used, power from one power supply 20 is transmitted to appropriate components as power of multiple systems.

Note that the output voltage Vout1 can be larger or smaller than the input voltage Vin depending on the relationship between the number of turns N11 of the first primary coil C11 and the number of turns N21 of the first secondary coil C21. The output voltage Vout2 can be larger or smaller than the input voltage Vin, depending on the relationship between the number of turns N12 of the second primary coil C12 and the number of turns N22 of the second secondary coil C22. Therefore, by using this power transmission device 10, two power transmission systems are simultaneously performed from the primary side to the secondary side by the two transformers 52 and 54 in accordance with the input voltage Vin and the turns ratio of the coil. be. Therefore, the power transmission device 10 can be used as a transformer.

The first primary coil C11 and the second primary coil C12 arranged in the primary core 32 of the power transmission device 10 according to this embodiment are connected in parallel to the AC power supply 20 . Therefore, the first primary coil C11 and the second primary coil C12 are independent. For example, when the load RL1 connected to the first secondary coil C21 fluctuates, the voltage V across the terminals of the first primary coil C11 facing the first secondary coil C21 is affected, The voltage V across the terminals of the primary coil C11 can fluctuate. On the other hand, even if the load RL1 connected to the first secondary coil C21 fluctuates, the voltage V across the terminals of the second secondary coil C22 is independent of and affected by the first secondary coil C21. do not have. Therefore, the voltage V across the terminals of the second primary coil C12 with respect to the second secondary coil C22 is less susceptible to fluctuations in the load RL1 connected to the first secondary coil C21. Therefore, even if the load RL1 connected to the first secondary coil C21 fluctuates, the voltage V across the terminals of the second primary coil C12 is not affected by it, and the voltage V across the terminals of the second primary coil C12 is stable. Electric power is obtained in the second secondary coil C22 by electromagnetic induction from the coil C12.

Bearings 76 , 86 are provided between one end and the other end of primary core 32 and secondary core 42 , respectively, and allow relative rotation of secondary core 42 with respect to primary core 32 . Rotational movement of the secondary assembly 14 relative to the primary assembly 12 is assisted by annular bearings 76,86. Bearings 76, 86 are provided between the primary assembly 12 and the secondary assembly 14 and close between the upper end of the primary core 32 and the upper end of the secondary core 42, and the lower end of the primary core 32 and the secondary core. 42 is closed. Therefore, the bearings 76 and 86 are dustproof portions (shields) that prevent foreign matter from entering the gap G between the primary side assembly 12 and the secondary side assembly 14, that is, between the primary core 32 and the secondary core 42. ).

In this embodiment, in addition to the bearings 76, 86, the first cover 78 and the second cover 88 prevent foreign matter from entering the gap G between the primary assembly 12 and the secondary assembly 14. be.

The power transmission device 10 may be operated continuously for an appropriate long period of time, such as several months to several years. Due to electromagnetic induction between the first primary coil C11 and the first secondary coil C21 and between the second primary coil C12 and the second secondary coil C22, each coil C11, C12, C21, C22 When the current continues to flow, the magnetic flux causes the primary iron core 32 and the secondary iron core 42 to heat up.

For example, if a foreign object exists in the gap G between the primary core 32 and the secondary core 42, the foreign object is heated by the magnetic flux generated when the current flows through the first primary coil C11 and the second primary coil C12. . Depending on the type of foreign matter, magnetic flux may cause the foreign matter to ignite. In this embodiment, the bearings 76 and 86 prevent foreign matter from entering the gap G between the primary core 32 and the secondary core 42 . Therefore, even if the primary iron core 32 and the secondary iron core 42 have heat, problems such as foreign objects being heated are prevented from occurring.

Second fixture 82 also rotates with secondary core 42 of secondary assembly 14 . As a result, the impeller 18 supported by the second fixture 82 rotates together with the secondary core 42 of the secondary assembly 14 . That is, impeller 18 rotates with the relative rotation between primary core 32 and secondary core 42 . Rotation of the impeller 18 causes air to flow toward the impeller 18 along the central axis C0 of the secondary core 42 and along the outside of the magnetic shield (permalloy) 66 toward the impeller 18, for example. . Therefore, the rotation of the secondary core 42 of the secondary assembly 14 is used to rotate the impeller 18 and cool the power transmission device 10 .

As described above, according to the power transmission device 10 according to the present embodiment, the primary coils C11 and C12 are connected in parallel to the primary core 32, and the secondary coils C21 and C22 are independently arranged in parallel to the secondary core 42. For this reason, electric power from the two systems of voltages Vout1 and Vout2 can be obtained simultaneously from the secondary coils C21 and C22. Then, for example, even if the voltage Vout1 fluctuates in response to an appropriate fluctuation of one load RL1 connected to the secondary coil C21, if the other load RL2 does not fluctuate, the other voltage Vout2 fluctuates. does not occur. Therefore, in the power transmission device 10 according to the present embodiment, even if the load RL1 of one of the two systems fluctuates and the voltage between the terminals of the secondary coil C21 to which the load RL1 is connected fluctuates, the remaining The primary coil C12 and the secondary coil C22 of one system are not affected, and power can be obtained at a stable voltage.

Therefore, according to this embodiment, the rotary power transmission device 10 capable of transmitting power of a plurality of systems is provided.

Further, according to the power transmission device 10 according to the present embodiment, the bearing 76 is arranged between one end of the primary assembly 12 and one end of the secondary assembly 14, and the other end of the primary assembly 12 and the secondary assembly 14 are arranged. A bearing 86 is placed between the other end of the assembly 14 . In the power transmission device 10, the primary side assembly 12 and the secondary side assembly 14 are non-contact and there is no direct contact position. Therefore, it is possible to suppress wear due to contact due to use of the power transmission device 10, and to extend the service life. Also, it is possible to prevent foreign matter from entering the gap G between the primary assembly 12 and the secondary assembly 14 . In addition, the power transmission device 10 can prevent foreign matter from entering the gap G and generating heat.

It should be noted that leakage flux may occur from the primary assembly 12 . In this embodiment, the magnetic shield 66 outside the primary core 32 of the primary assembly 12 blocks leakage flux. Therefore, it is possible to prevent the influence of the AC power supply 20 from being exerted on the outside of the magnetic shield 66 of the power transmission device 10 . In the power transmission device 10 according to this embodiment, an example in which the magnetic shield 66 is provided outside the primary core 32 has been described, but the magnetic shield 66 may not always be necessary.

A planetary gear (not shown), for example, can be arranged between the second fixture 74 and the impeller 18 . In this case, the rotation speed of the impeller 18 can be made higher than the rotation speed of the secondary iron core 42 and the second fixing bracket 74, and a higher wind speed for cooling the power transmission device 10 can be obtained.

In this embodiment, the example in which the two transformers 52 and 54 are formed in the power transmission device 10 to obtain two power systems independent of each other has been described. A third primary coil is connected in parallel to the primary core 32, the first primary coil C11 and the second primary coil C12, and a third secondary coil is connected to the secondary core 42, facing the third primary coil. You may set it in the state to do. In this case, three power systems can be obtained. Thus, there is no limit to the number of primary coils provided in the primary core 32 and connected in parallel to the primary circuit 22 . There is no limit to the number of secondary coils provided in secondary core 42 . It is sufficient that the primary coil provided on the primary core 32 and the secondary coil provided on the secondary core face each other. Therefore, according to the present embodiment, there is provided the rotary power transmission device 10 capable of transmitting power of a plurality of systems, such as three or more, not limited to two.

The case where the secondary core 42 of the secondary side assembly 14 of the power transmission device 10 shown in FIGS. 1 and 2 is cylindrical has been described as an example. The secondary core 42 may be solid and cylindrical. In addition, the primary core 32 of the primary side assembly 12 and the secondary core 42 of the secondary side assembly 14 are not limited to cylindrical shapes, but are formed rotationally symmetrical with respect to the central axis C0. 42 are rotatable relative to each other, various shapes are acceptable. For example, the primary core 32 and secondary core 42 may be formed in a triangular pyramid shape.

In this embodiment, an example in which the primary assembly 12 is arranged outside the secondary assembly 14 has been described. As a modification of the rotary power transmission device 10, as shown in FIG. It may be arranged inside the secondary core 42 . In this case, coils C11, C12, C21 and C22 are arranged as shown in FIG. The primary coils C11 and C12 are connected in parallel to the primary circuit 22 . The secondary coil C21 is electrically connected to the secondary side circuit 24 . The secondary coil C22 is electrically connected to the secondary side circuit 26 .

In the example shown in FIG. 4, the secondary core 42 outside the primary core 32 is rotatable around the central axis C0. Therefore, it is preferable that the outside of the secondary core 42 is protected by the magnetic shield 66 .

An embodiment of a contactless power transmission system 100 having a rotary power transmission device 10 will be described with reference to FIG. As the rotary power transmission device 10 here, the one shown in FIGS. 1 and 2 is used.

FIG. 5 shows a schematic diagram of a contactless power transmission system 100 having the power transmission device 10 . As shown in FIG. 5, a contactless power transmission system 100 having a power transmission device 10 includes a frame 100a, a drive source 102, a driving force transmission section 104, the power transmission device 10, an antenna rotating section (driven body ) 106 and an antenna (driven body) 108 . The power transmission device 10 is supported by a frame 100a. The antenna rotating section 106 is supported by the frame 100a. The driving source 102 and the driving force transmission section 104 are supported by the frame 100a. In FIG. 5 , the central axis C0 of the power transmission device 10 is parallel to the rotation axis Ca of the antenna rotating section 106 . The power transmission device 10 is arranged in a path for transmitting driving force from the driving source 102 to the antenna rotating section 106 and the antenna 108 which are driven bodies.

The second fixing bracket 74 is provided with a plurality of pins 74a. A wire 110 extending from the antenna rotating portion 106 is supported by the pin 74a. When the antenna rotating portion 106 rotates about the rotation axis Ca with respect to the frame 100a, the second fixing bracket 74 rotates around the rotation axis Ca of the antenna rotating portion 106 via the pin 74a supported by the wire 110. rotate to

An optical rotary joint 112 is fixed as a signal transmission section to the inner peripheral surface of the secondary iron core 42 of the secondary assembly 14 . For example, the first rotating body 112a of the optical rotary joint 112 fixed to the inner peripheral surface of the secondary core 42 is rotatable with respect to the second rotating body 112b provided outside the secondary core 42. . The second rotor 112b is fixed to the frame. A cable 112c such as an optical fiber connected to the first rotating body 112a of the optical rotary joint 112 is connected to the antenna 108, for example. A cable 112 d such as an optical fiber connected to the second rotor 112 b of the optical rotary joint 112 is used to transmit and receive signals between an external device of the contactless power transmission system 100 and the antenna 108 .

Next, operation of the contactless power transmission system 100 will be described using FIG.

When the driving source 102 is driven, the driving force transmission section 104 receives the driving force from the driving source 102 . The driving force transmitted to the driving force transmitting portion 104 causes the antenna rotating portion 106 and the antenna 108, which are the objects to be rotated, to rotate about the rotation axis Ca of the antenna rotating portion 106. FIG.

At this time, as the antenna rotating portion 106 rotates, the second fixing metal fitting 74 connected by the wire 110 rotates about the rotation axis Ca of the antenna rotating portion 106 . The first fixture 72 is fixed to the frame 100a. For this reason, the primary core 32 integrated with the second fixing bracket 74 rotates around the rotation axis Ca of the antenna rotating part 106 with respect to the secondary core 42 integrated with the second fixing bracket 74 . Rotate. The power transmission device 10 can be used, for example, as a part that interlocks with the rotation of the antenna rotating section 106 . In the power transmission device 10, the secondary assembly 14 continues to rotate at an appropriate rotational speed with respect to the primary assembly 12. FIG.
Although an example in which the primary core 32 rotates about the rotation axis Ca with respect to the secondary core 42 has been described here, the secondary core 42 rotates with respect to the primary core 32 about the rotation axis Ca. It may be configured as That is, the secondary core 42 may be configured to rotate relative to the primary core 32 by the driving force transmitted to the driving force transmission portion 104 .

The power obtained by the first secondary coil C21 of the first transformer 52 can be used, for example, as a power source for transmitting and receiving signals of the antenna 108 . The power obtained by the second secondary coil C22 of the second transformer 54 can be used as a power source for a control circuit (not shown) of the antenna 108, for example.

As described above, the contactless power transmission system 100 according to this embodiment has the power transmission device 10 capable of transmitting power of a plurality of systems. Therefore, desired power can be supplied to desired parts such as operating parts and control circuits of the contactless power transmission system 100, for example. Since the power transmission device 10 can be prevented from wearing due to contact due to use and can withstand continuous use, it is possible to lengthen the intervals between periodic maintenance. Therefore, the contactless power transmission system 100 having the rotary power transmission device 10 capable of transmitting power of a plurality of systems is provided.

Using the first rotor 112a of the optical rotary joint 112 arranged in the secondary core 42 of the secondary assembly 14 of the power transmission device 10 and the second rotor 112b supported by the frame, the power transmission device Signals can be transmitted to and received from the antenna 108 while the secondary core 42 of the secondary assembly 14 of 10 and the antenna 108 are being rotated. Therefore, signals can be transmitted and received between the antenna 108 and the outside of the power transmission system 100 .

In the present embodiment, as shown in FIG. 5, the central axis C0 of the power transmission device 10 is parallel to and coaxial with the rotation axis Ca of the antenna rotating section 106, as an example. The central axis C0 of the power transmission device 10 does not have to be coaxial with the rotation axis Ca of the antenna rotation section 106 .

Here, the case where the power transmission device 10 is one of the components that operate the antenna (radar) 108 installed on the ground, for example, in the contactless power transmission system 100 has been described as an example. The power transmission device 10 is used in place of the antenna 108 together with a rotatable body that is rotated by driving force from a driving source, such as an in-vehicle radar or a CT (computed tomography) device. In addition, the power transmission device 10 can also be used for regenerative braking and the like. In this embodiment, the secondary assembly 14 of the power transmission device 10 is supported by the rotated body so as to rotate together with the rotated body.

According to at least one embodiment described above, it is possible to provide the rotary power transmission device 10 capable of transmitting power of a plurality of systems, and the contactless power transmission system 100 having the rotary power transmission device 10. .

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 10... Rotary power transmission apparatus, 12... Primary side assembly, 14... Secondary side assembly, 16... Support frame, 18... Impeller, 20... AC power supply, 22... Primary side circuit, 24, 26... Secondary side circuit , 32... primary core, 42... secondary core, 52... first transformer, 54... second transformer, 62... first support assembly, 64... second support assembly, 66... magnetic shield, 72... second 1 fixing metal fitting, 74... second fixing metal fitting, 76... first bearing, 78... first cover, 82... third fixing metal fitting, 84... fourth fixing metal fitting, 86... second bearing, 88... Second cover 100... Contactless power transmission system 100a... Frame 102... Driving source 104... Driving force transmission unit 106... Antenna rotating part 108... Antenna 112... Optical rotary joint 112a... Third 1 rotating body, 112b... second rotating body, 112c, 112d... cable, C11... first primary coil, C12... second primary coil, C21... first secondary coil, C22... second secondary coil Next coil, N11, N12, N21, N22... number of turns, RL1, RL2... load, Vin... input voltage, Vout1, Vout2... output voltage.

Claims (7)

a tubular primary core;
a first primary coil provided on the inner peripheral surface of the primary core and supplied with power from an AC power supply;
a second primary coil provided apart from the first primary coil on the inner peripheral surface of the primary iron core and electrically connected in parallel to the first primary coil;
a cylindrical or columnar secondary core provided inside the primary core and rotatable relative to the primary core, the first primary coil, and the second primary coil;
a first secondary coil provided at a position facing the inner side of the first primary coil on the outer peripheral surface of the secondary core;
a second secondary coil provided at a position facing the inner side of the second primary coil on the outer peripheral surface of the secondary core;
A rotary power transmission device. a cylindrical or columnar primary core;
a first primary coil provided on the outer peripheral surface of the primary core and supplied with power from an AC power supply;
a second primary coil provided apart from the first primary coil on the outer peripheral surface of the primary iron core and electrically connected in parallel to the first primary coil;
a cylindrical or columnar secondary core provided outside the primary core and rotatable relative to the primary core, the first primary coil, and the second primary coil;
a first secondary coil provided at a position facing the outside of the first primary coil on the inner peripheral surface of the secondary core;
A rotary power transmission device comprising: a second secondary coil provided at a position facing the outside of the second primary coil on an inner peripheral surface of the secondary core. The first primary coil and the second primary coil are arranged annularly around the central axis of the primary core,
The first secondary coil and the second secondary coil are arranged annularly around the central axis of the secondary core concentric with the central axis of the primary core. 3. The rotary power transmission device according to 2. a first bearing provided between one end of the primary core and one end of the secondary core and closing the space between the one end of the primary core and the one end of the secondary core;
provided between the other end of the primary core and the other end of the secondary core to block the gap between the other end of the primary core and the other end of the secondary core, and to the primary core 4. The rotary power transmission device according to any one of claims 1 to 3, further comprising: a second bearing that allows rotation of said secondary core. a first cover fixed to the primary core and covering the first bearing;
5. The rotary power transmission device according to claim 4, further comprising: a second cover fixed to said primary core and covering said second bearing. 6. The rotary power transmission device according to any one of claims 1 to 5, further comprising an impeller provided in said secondary core and rotating as said secondary core rotates with respect to said primary core. a driving source;
a driving force transmission unit that receives the driving force from the driving source;
a rotated body rotated by the driving force transmitted to the driving force transmitting portion;
The rotary power transmission device according to any one of claims 1 to 6, wherein the secondary core rotates relative to the primary core by driving force transmitted to the driving force transmission unit. A contactless power transmission system comprising:

Images