Leakage magnetic flux generator and power equipment

Abstract

To provide a leakage magnetic flux power generating device and a power device which are easy to install in a power device, do not require the trouble of wiring, securing space, or battery replacement, have excellent power generation efficiency, and are compatible with various types of boards equipped with power supply ICs with different operating voltages, and are highly versatile. [Solution] A leakage magnetic flux power generating device (10) is attached to a power device having a moving body that performs rotational or linear motion using electromagnetic force, and includes one or more windings (11B) that generate electromotive force through electromagnetic induction due to changes in leakage magnetic flux leaking from the power device, which is a rotary motor or linear motor, in accordance with the rotational motion of the rotor, which is the moving body, or the linear motion of a slide slider.

Description

[Technical Field]

[0001] The present invention relates to a leakage flux power generating device and a power machine equipped with the same. [Background technology]

[0002] In recent years, advances in information technology have made it possible to utilize various sensors, communication devices, data processing devices, etc., and attach these devices to various facilities and equipment, thereby enabling the understanding of operating conditions and the early detection and prediction of failures using the acquired data. For example, in various facilities, primarily infrastructure systems for air conditioning and water supply and drainage, in order to maintain stable operation of power equipment such as motors and electromagnetic valves, sensors are attached to the power equipment to observe temperature fluctuations, the presence or absence of vibration, etc. The observation data obtained by the sensors attached to the power equipment is transmitted to devices such as smartphones and tablet devices via data communication boards, etc., and is used to monitor the operating conditions of various facilities.

[0003] When sensors are attached to various powered devices such as those described above, and a sensor drive circuit board, a data processing / communication board, etc. are also installed, commercial power sources or batteries are generally used to provide the driving power for these devices. However, supplying the driving power for each board from a commercial power source increases costs due to the wiring work and the need to secure wiring paths. On the other hand, using batteries for the driving power eliminates the wiring work, but creates the problem of the need to replace the batteries at regular intervals. Therefore, whether the driving power is supplied from a commercial power source or from a battery, a significant burden is placed on both the user and provider of the powered device.

[0004] In recent years, power generation devices have been proposed that use so-called energy harvesting technology, which utilizes vibrations and leakage magnetic flux that are generated secondarily during the operation of power equipment, and generate electricity while attached to the power equipment. When power generated using a method that utilizes the installation environment in this way is used to operate the sensor drive circuit board, data processing and communication board, etc., described above, installation becomes easy without the need for wiring from a commercial power source or securing space. Furthermore, the adoption of this technology eliminates the need for battery replacement and is therefore thought to improve maintainability.

[0005] For example, Patent Document 1 discloses a vibration power generation device that can be attached to a mechanical device such as a production machine or a machine tool. According to the vibration power generation device described in Patent Document 1, a power generation element is vibrated in response to vibration of the mechanical device, and power is extracted from a coil attached to a magnetostrictive plate provided in the power generation element. The vibration power generation device described in Patent Document 1 also includes a frequency adjustment member attached to a frame joined to the power generation element, which adjusts the resonant frequency of the vibration power generation device.

[0006] Furthermore, Patent Document 2 discloses a magnetic field power generator that is arranged outside the housing of a power device, includes a winding that can generate electricity using leakage magnetic flux generated from polyphase wiring, and a holder that holds the winding, and is attached to the outer surface of the housing via this holder. Patent Document 2 describes that the above configuration makes it possible to generate electricity using leakage magnetic flux generated from polyphase wiring, and that by providing the magnetic field power generator including the winding outside the housing, it is possible to reduce the workload of maintenance and the like without having to drill holes or the like in the housing of the power device.

[0007] Patent Document 3 discloses a compound generator that includes a main generator having a ring-shaped magnet that rotates around the rotation axis of a shaft and a coil arranged to face the magnet, and an auxiliary generator that generates electricity using leakage magnetic flux from the main generator to supplement the power generated by the main generator. Patent Document 3 states that the above configuration makes it possible to provide a compound generator that can utilize leakage magnetic flux from the magnet. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent Publication No. 2021-153381 [Patent Document 2] Japanese Patent Application Publication No. 2019-068663 [Patent Document 3] Patent No. 6935909 Summary of the Invention [Problem to be solved by the invention]

[0009] The semiconductor elements (power supply ICs) used in IoT communication devices such as the data communication boards mentioned above are designed to be optimized for differences in impedance depending on the type of power source, such as photovoltaic, thermal, or vibration power generation, and each has a different operating voltage. This can lead to cases where different circuit boards must be used depending on the power source voltage, which can result in increased costs.

[0010] The operating voltage range of the power supply ICs described above varies greatly depending on the specifications, for example, 0.02 to 0.2 V, 0.2 to 1.0 V, 0.2 to 2 V, 2 to 5.5 V, etc. When attaching a power generator to power equipment and supplying the generated power to the various boards described above, it is necessary to ensure at least the minimum operating voltage of the power supply ICs described above, but there is a problem in that it is difficult to cover all voltage bands with a single type of power generator.

[0011] However, in the case of a resonant vibration type vibration power generation device such as that described in Patent Document 1, the device is configured to generate power only at frequencies near the resonant frequency, which means that the specifications must be changed depending on the industrial equipment in which it is installed, resulting in a lack of versatility. Although the vibration power generation device described in Patent Document 1 is equipped with a frequency adjustment member, the resonant frequency mainly depends on the size and structure of the power generation element, so the adjustment range is limited, and there are limits to improving versatility. Furthermore, with a vibration power generation device configured using a resonant vibration type such as that described in Patent Document 1, the output voltage is limited to one voltage, which also causes poor versatility.

[0012] Furthermore, when using magnetic flux leaking from multilayer wiring to supply power to power equipment, as in Patent Document 2, the leakage magnetic flux itself is very small, so a large voltage cannot be obtained. Therefore, with the power generation method as in Patent Document 2, it becomes difficult to ensure the minimum operating voltage of the power supply ICs with the various specifications mentioned above.

[0013] Furthermore, in a composite generator such as that described in Patent Document 3, the shaft supporting the magnet rotates due to an external torque, and the power generated by the magnet's rotation is extracted from the coil. This results in a relatively small leakage magnetic flux acting on the auxiliary generator. Therefore, as with Patent Document 2, it is difficult to ensure the minimum operating voltage of power supply ICs with various specifications. Furthermore, in the case of the composite generator described in Patent Document 2, the auxiliary generator is integrated with the main generator, so the specifications must be incorporated at the design stage. Therefore, it is not easy to install the auxiliary generator after the fact. For example, it is difficult to change the specifications of the auxiliary generator to accommodate various boards that supply power, resulting in a lack of versatility and expandability.

[0014] Therefore, in order to apply power generation using energy harvesting technology that utilizes the installation environment to supply power to the various boards described above, there was a strong demand for a power generation device that could be easily attached to power equipment, etc., and that had excellent power generation efficiency and versatility.

[0015] The present invention has been made in view of the above problems, and aims to provide a leakage flux power generating device that is easy to attach to power equipment, does not require the effort of wiring, securing space, or battery replacement, has excellent power generation efficiency, and is highly versatile as it can be used with a variety of boards equipped with power supply ICs of different operating voltages, as well as power equipment to which this leakage flux power generating device is attached. [Means for solving the problem]

[0016] In order to solve the above problems, the inventors conducted extensive research. As a result, they discovered that by adopting a configuration including one or more windings that can generate electricity using changes in leakage magnetic flux and attaching such a configuration to a power device having a moving body that performs rotational or linear motion using electromagnetic force, excellent power generation efficiency can be achieved. They also discovered that by optimizing the number of windings, etc., it becomes possible to support a variety of boards equipped with power supply ICs with different operating voltages, and they completed the present invention.

[0017] That is, the present invention provides a leakage flux power generating device that is attached to a power machine having a moving body that performs rotational or linear motion due to electromagnetic force, and that is characterized by including one or more windings that generate electromotive force by electromagnetic induction due to changes in leakage flux leaking from the power machine in conjunction with the rotational or linear motion of the moving body.

[0018] In the above-described aspect of the leakage magnetic flux power generating device of the present invention, the winding can be configured to generate electromotive force by electromagnetic induction due to changes in leakage magnetic flux leaking from one or both of an electromagnetic coil and a permanent magnet that cause rotational or linear motion of the moving body, which are provided in the power equipment.

[0019] In the above aspect, the leakage flux power generating device of the present invention preferably further comprises a core made of a soft magnetic material, at least a portion of which is inserted into the internal space of the winding.

[0020] In the leakage flux power generating apparatus of the present invention, in the above-described aspect, the core may be made of a rod-shaped member, and one end of the core may be configured as an attachment portion for attaching to the outer surface of a housing of the power equipment.

[0021] In the above-described aspect of the leakage magnetic flux power generating device of the present invention, it is more preferable that the core is made of a U-shaped member when viewed from the front, and each of the two ends of the core is an attachment portion for attaching to the outer surface of the housing of the power equipment.

[0022] In the above-described aspect, the leakage magnetic flux power generating device of the present invention may employ a configuration in which a plurality of the windings are provided, and at least a portion of the core is inserted so as to span the internal space of each of the plurality of windings, thereby arranging the plurality of windings in series.

[0023] In the above-described aspect of the leakage magnetic flux power generating device of the present invention, the two ends of the core may each be attached to the outer surface of the housing of the power equipment at positions where the timing of change of the leakage magnetic flux differs.

[0024] In the leakage magnetic flux power generating device of the present invention, in the above-mentioned aspects, the plurality of windings may each have the same or different impedances, and the currents generated in the plurality of windings may be output individually for each winding, or at least some of the plurality of windings may be electrically connected in series or in parallel so that the currents are output collectively.

[0025] In the above-described aspect of the leakage magnetic flux power generating apparatus of the present invention, the power device may be a rotary motor having a rotor as the moving body, and the windings may be arranged so that the winding axis of the windings is perpendicular to the direction of rotation of the rotor.

[0026] In the above-described aspect of the leakage magnetic flux power generating apparatus of the present invention, the power device may be a linear motor having a sliding element as the moving body, and the windings may be arranged so that the winding axis of the windings is perpendicular to the direction of movement caused by the linear motion of the sliding element.

[0027] The present invention provides a power machine comprising a moving body that performs rotational or linear motion by electromagnetic force, and one or more leakage flux power generating devices according to the present invention attached to the outer surface of a housing in which the moving body is arranged. [Effects of the Invention]

[0028] The leakage magnetic flux power generation device of the present invention employs a configuration including one or more windings that generate electromotive force through electromagnetic induction due to changes in leakage magnetic flux leaking from the moving body of a power machine in conjunction with the rotational or linear motion of the moving body. As described above, by adopting a configuration including one or more windings that can generate electricity using changes in leakage magnetic flux and by attaching such a configuration to a power device, it is possible to obtain excellent power generation efficiency. If the number of windings is optimized, it is also possible to simultaneously supply power at multiple different voltages. Therefore, it is possible to realize a leakage flux power generation device with a simple configuration that is easy to install on power equipment, does not require the hassle of wiring, space allocation, or battery replacement, has excellent power generation efficiency, and is compatible with a variety of boards equipped with power supply ICs with different operating voltages, making it highly versatile.

[0029] Furthermore, power equipment of the present invention is equipped with the leakage flux power generating device according to the present invention described above, and therefore the power efficiently generated by the leakage flux power generating device can be stably supplied to, for example, a sensor drive board, a data processing / communication board, etc. Furthermore, even if the various boards described above are equipped with power supply ICs with different operating voltages, by optimizing the number of windings provided in the leakage flux power generating device, it is possible to operate a variety of boards while simultaneously supplying power of multiple different voltages. Therefore, it is possible to realize a powered device having a variety of functions obtained by the operation of various boards without requiring a commercial power source or batteries.

[0030] Other objects, features and advantages of the present invention will become apparent from the following description of the preferred embodiments of the present invention, which proceeds with reference to the accompanying drawings. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 1 is a diagram for explaining one embodiment of a leakage flux power generating device and power equipment according to the present invention, and is a perspective view showing an example of the overall configuration in which a leakage flux power generating device is attached to the outer surface of a housing of a rotary motor (power equipment). [Figure 2] FIG. 2 is a diagram for explaining one embodiment of a leakage flux power generating device according to the present invention, and is a cutaway view showing an enlarged example of a leakage flux power generating device in which a core made of a rod-shaped member is inserted into the internal space of the winding shown in FIG. [Figure 3] FIG. 3 is a diagram for explaining one embodiment of the leakage flux power generating apparatus and power equipment according to the present invention, and is a front view seen from the axial direction of the rotating shaft, schematically showing one example of the overall configuration in which the leakage flux power generating apparatus of the example shown in FIG. 2 is attached to the outer surface of the housing of a rotary motor (power equipment). [Figure 4] FIG. 4 is a diagram for explaining one embodiment of the leakage flux power generating apparatus and power equipment according to the present invention, and is a cutaway view seen from the front side that schematically shows another example of the overall configuration in which the leakage flux power generating apparatus of the example shown in FIG. 2 is attached to the outer surface of the housing of a rotary motor (power equipment). [Figure 5] FIG. 5 is a diagram for explaining an embodiment of a leakage flux power generating device according to the present invention, and is a cutaway view that shows a schematic example in which a core made of a U-shaped member is inserted into the internal space of the winding. [Figure 6] FIG. 6 is a diagram for explaining one embodiment of the leakage flux power generating apparatus and power equipment according to the present invention, and is a front view showing, in outline, another example of the overall configuration in which the leakage flux power generating apparatus of the example shown in FIG. 5 is attached to the outer surface of the housing of a rotary motor (power equipment). [Figure 7] FIG. 7 is a diagram for explaining one embodiment of the leakage flux power generating apparatus and power equipment according to the present invention, and is a front view showing, in outline, another example of the overall configuration in which a plurality of leakage flux power generating apparatuses of the example shown in FIG. 5 are attached to the outer surface of the housing of a rotary motor (power equipment). [Figure 8] FIG. 8 is a diagram for explaining one embodiment of a leakage flux power generating device according to the present invention, and is a cutaway view that shows an example in which a core made of a U-shaped member is inserted so as to span the internal space of multiple windings. [Figure 9] FIG. 9 is a diagram for explaining one embodiment of a leakage flux power generating apparatus according to the present invention, and is a schematic diagram showing only a rod-shaped core provided in the leakage flux power generating apparatus of the example shown in FIG. [Figure 10] FIG. 10 is a diagram for explaining one embodiment of a leakage flux power generating apparatus according to the present invention, and is a schematic diagram showing the relationship between a core consisting of a U-shaped member provided in the leakage flux power generating apparatus of the example shown in FIG. 5 and the direction of leakage flux. [Figure 11] FIG. 11 is a diagram for explaining an embodiment of a leakage flux power generating apparatus according to the present invention, and is a schematic diagram showing another example of a core inserted into the internal space of the winding. [Figure 12] FIG. 12 is a diagram for explaining an embodiment of a leakage flux power generating device according to the present invention, and is a schematic diagram showing another example of a core inserted into the internal space of the winding. [Figure 13] FIG. 13 is a diagram for explaining one embodiment of the leakage magnetic flux power generating apparatus and power equipment according to the present invention, and is a schematic diagram showing the relationship between the core consisting of a U-shaped member provided in the leakage magnetic flux power generating apparatus of the example shown in FIG. 5, the direction of magnetic flux leaking from an AC synchronous motor (power equipment; rotary motor), and the timing at which this magnetic flux changes. [Figure 14] FIG. 14 is a diagram for explaining an embodiment of the leakage flux power generating device and power equipment according to the present invention, and is a graph showing electromotive force waveforms comparing the voltage generated when the leakage flux power generating device is attached to the housing of an AC speed control motor (power equipment; rotary motor) between a sample of the leakage flux power generating device of the example shown in FIG. 2 and a sample of the leakage flux power generating device of the example shown in FIG. 5. [Figure 15] FIG. 15 is a diagram for explaining an embodiment of the leakage magnetic flux power generating apparatus and power equipment according to the present invention, and is a graph showing electromotive force waveforms comparing voltages generated when the leakage magnetic flux power generating apparatus of the example shown in FIG. 2 is attached to the housing of an AC speed control motor (power equipment; rotary motor) between samples with high and low winding impedances. [Figure 16] FIG. 16 is a diagram for explaining an embodiment of the leakage magnetic flux power generating apparatus and power equipment according to the present invention, and is a graph showing electromotive force waveforms obtained by measuring voltages generated when a sample of the leakage magnetic flux power generating apparatus of the example shown in FIG. 2 is attached to the housing of an AC speed control motor (power equipment; rotary motor) and the line speed (rotational speed) of the rotary motor is changed, and comparing the measured voltages. [Figure 17] FIG. 17 is a diagram for explaining an embodiment of the leakage magnetic flux power generating apparatus and power equipment according to the present invention, and is a graph showing an electromotive force waveform obtained by measuring the voltage when a sample of the leakage magnetic flux power generating apparatus of the example shown in FIG. 2 is attached to the housing of a three-phase AC constant speed induction motor (power equipment; rotary motor) and generating power, and confirming the power generation frequency. [Figure 18] Figures 18(a) to (c) are diagrams for explaining examples of the leakage magnetic flux power generating device and power equipment according to the present invention, and are graphs showing electromotive force waveforms obtained by attaching a sample of the leakage magnetic flux power generating device of the example shown in Figure 2 to the housing of a DC speed control motor (power equipment; rotary motor) to generate power, measuring the voltage while changing the rotational speed of the rotary motor to confirm the power generation frequency, with Figure 18(a) being the graph when the rotational speed is slow, Figure 18(b) being the graph when the rotational speed is medium, and Figure 18(c) being the graph when the rotational speed is fast. DETAILED DESCRIPTION OF THE INVENTION

[0032] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a leakage flux power generating device according to the present invention and a power machine including the same will be described in detail with reference to the drawings as appropriate. In the drawings used in the following description, for the sake of clarity, characteristic parts may be shown slightly enlarged, and the dimensional ratios of the components may differ from the actual ones. Furthermore, the materials, dimensions, etc. exemplified in the following description are merely examples, and the present invention is not limited to them and can be implemented with appropriate changes made within the scope of the present invention.

[0033] <Power equipment (power equipment to which leakage magnetic flux power generation devices can be attached)> The power equipment to which the leakage magnetic flux power generating apparatus of this embodiment is attached will be described in detail mainly with reference to Figs. 1, 3, 4, 6, 7, and 13 as appropriate (also with reference to Figs. 2, 5, etc. as appropriate). The leakage magnetic flux power generating device of this embodiment (see reference numeral 10 in FIG. 1, etc.; hereinafter, sometimes abbreviated as power generating device), the details of which will be described later, is attached to one or more power equipment having a moving body that performs rotational or linear motion by electromagnetic force, and generates electromotive force in response to changes in leakage magnetic flux leaking from this power equipment. For this reason, in this specification (this embodiment), the detailed configuration of the power equipment and the mechanism by which magnetic flux leaks will first be described.

[0034] FIG. 1 is a perspective view showing an example of an overall configuration in which a power generating device 10 (see also FIG. 2) is attached to an outer surface 31a of a housing 31 of a rotary motor (power machine) 3. As shown in FIG. FIG. 3 is a front view showing an example of the overall configuration in which the power generating device 10 is attached to the outer surface 31a of the housing 31 of the rotary motor 3, as viewed from the axial direction of the rotary shaft 36. FIG. 4 is a cutaway view of another example of the overall configuration in which the power generating device 10 is attached to the outer surface 31a of the housing 31 of the rotary motor (power machine) 3A, as viewed in the axial direction of the rotary shaft 36, that is, from the front side. FIG. 6 is a front view seen from the axial direction of the rotary shaft 36, showing another example of the overall configuration in which the power generating device 10A (see also FIG. 5) is attached to the outer surface 31a of the housing 31 of the rotary motor 3. FIG. 7 is a front view of another example of the overall configuration in which a plurality of power generating devices 10A are attached to the outer surface 31a of the housing 31 of the rotary motor 3, as viewed from the axial direction of the rotary shaft . FIG. 13 is a schematic diagram showing the relationship between the direction of leakage magnetic flux M leaking from a core 13 consisting of a U-shaped member provided in a power generating device 10A, a rotary motor (power equipment) 3B which is an AC synchronous motor, and the timing at which the leakage magnetic flux M changes.

[0035] The rotary motor 3 shown in FIG. 1 is an example of a power device to which the power generating device 10 of this embodiment can be attached, and has a rotor that rotates as a moving body (see also FIGS. 3 and 6 for the rotary motor 3). Although detailed illustration of the rotary motor 3 is omitted in Figure 1, it has a stator and a rotor inside, and a rotating shaft (see reference numeral 36 in Figure 3, etc.) connected to the rotor is arranged to protrude outside, making it possible to supply rotational force to the outside. As shown in FIG. 1, the power generating device 10 of this embodiment is attached to the outer surface 31a of the housing 31 of the rotary motor 3, and in the illustrated example, the power generating device 10 is attached near the top of the cylindrical housing 31 that is in a horizontal position. In the illustrated example, the rotary motor 3 is supported on the support base 2, and thus the power generating device 10, the rotary motor 3, and the support base 2 constitute a power equipment system 1.

[0036] In the example shown in Fig. 1, the support base 2 is configured in a rectangular parallelepiped shape, and the rotary motor 3 is installed on the upper surface side. On the other hand, in the examples shown in Figs. 3, 6, and 7, the support base 2 is illustrated as having a substantially triangular shape in vertical cross section for the convenience of illustrating the rotary motors 3 and 3A. The support base 2 can be made of any metal material that can withstand the weight of a power device such as a rotary motor and that allows the power device to be stably installed.

[0037] Although the detailed structure of the rotary motor 3 is not shown in Figures 1, 3, 6, and 7, it is, for example, an AC motor or DC motor with a brushless structure that includes an electromagnetic coil and a permanent magnet, with the stator side having the electromagnetic coil and the rotor side having the permanent magnet.

[0038] Specific examples of AC motors include an AC synchronous motor (see FIG. 13), which will be described in detail later, an AC speed control motor, a three-phase AC constant speed induction motor, and the like. A specific example of a DC motor is a DC speed control motor, etc. In addition to the brushless DC motor described above, DC motors also include those in which the stator side has a permanent magnet, the rotor side has an electromagnetic coil and a commutator, and current is supplied from the brush to the commutator.

[0039] As an example of the internal structure of a rotary motor, first, rotary motor 3A, which is a DC motor, shown in Fig. 4 will be described. The cutaway view of Fig. 4 shows the internal structure of rotary motor 3A, and in the illustrated example, power generation device 10, which will be described in detail later, is attached to outer surface 31a of housing 31. As shown in FIG. 4, rotary motor 3A includes a stator 32 having a plurality of electromagnetic coils 32a and a rotor 33 having a plurality of permanent magnets 33a inside a roughly cylindrical housing 31, and a rotating shaft 36 for transmitting rotational force to the outside is disposed at the central axis of rotor 33.

[0040] The stator 32 is attached to the inner surface of the housing 31, opposite the outer surface 31a. A plurality of electromagnetic coils 32a constituting the stator 32 are attached to the inner surface of the housing 31, and in the illustrated example, a total of nine electromagnetic coils 32a are arranged at equal intervals. That is, the electromagnetic coils 32a in the illustrated example are arranged in a ring shape at 40° intervals in the circumferential direction of the inner surface of the housing 31.

[0041] The rotor 33 is disposed inside the stator 32 so as to be surrounded by the stator 32, and the multiple permanent magnets 33a are disposed so as to face the multiple electromagnetic coils 32a provided in the stator 32. The rotor 33 rotates about the rotary shaft 36 due to repeated magnetic attraction and repulsion generated between the multiple permanent magnets 33a and the multiple energized electromagnetic coils 32a. As a result, the rotary motor 3A transmits rotational force to the outside via the rotary shaft 36.

[0042] In the rotary motor 3A, which is the power machine of this embodiment, the power generator 10 is detachably attached to the outer surface 31a of the housing 31. With this configuration, although details will be described later, in particular, an electromotive force is generated in the power generator 10 by electromagnetic induction according to changes in leakage magnetic flux (see also symbol M in FIG. 13 ) leaking from the rotor 33, which is a rotating body. In this way, the leakage magnetic flux leaking from the permanent magnet 33a changes with the rotation of the rotor 33, thereby effectively generating an electromotive force in the power generator 10. Therefore, efficient and stable power generation is possible by utilizing the leakage magnetic flux that would normally attenuate or disappear toward the outside of the rotary motor.

[0043] Next, as another example of the internal structure of a rotary motor, rotary motor 3B, which is an AC synchronous motor, shown in Fig. 13 will be described. The cutaway view in Fig. 13 shows the internal structure of rotary motor 3B, and in the illustrated example, core 13, which is included in a power generating device, the details of which will be described later, is attached to outer surface 31a of housing 31. As shown in Fig. 13, rotary motor 3B includes a stator 35 having a plurality of electromagnetic coils 35a, 35b, and 35c, and a rotor 34 consisting of a single permanent magnet, inside a generally cylindrical housing 31. Although not shown in Fig. 13, a rotating shaft for transmitting rotational force to the outside is disposed at the position of the central axis of rotor 34.

[0044] As in the rotary motor 3A shown in FIG. 4, the stator 35 is attached to the inner surface of the housing 31 opposite the outer surface 31a. The electromagnetic coils 35a, 35b, and 35c that make up the stator 35 are attached to the inner surface of the housing 31. In the illustrated example, the electromagnetic coils 35a, 35b, and 35c are arranged so that each coil faces the other at two locations, for a total of six locations equally spaced apart. That is, the electromagnetic coils 35a, 35a, 35b, and 35c in the illustrated example are arranged in a ring shape at 60° intervals in the circumferential direction of the inner surface of the housing 31. Furthermore, the electromagnetic coils 35a, 35a, 35b, and 35c, 35c, each provided at two locations, are configured to generate magnetic fields of south and north poles in pairs.

[0045] The rotor 34 is disposed inside the stator 35 so as to be surrounded by the stator 35, and in the illustrated example, is composed of a single, generally plate-shaped permanent magnet. The rotor 34 in the illustrated example has two outer peripheral ends that are formed as south and north poles of the permanent magnet, respectively, and is disposed so that these poles face the multiple electromagnetic coils 35a, 35b, and 35c provided in the stator 35. The rotor 34 rotates about a rotation axis (not shown) due to repeated attraction and repulsion of magnetic MF generated between the south and north poles and the multiple energized electromagnetic coils 35a, 35b, and 35c. As a result, the rotary motor 3B transmits rotational force to the outside via the rotation axis.

[0046] Rotary motor 3B, which is the power device of this embodiment, has a power generating device detachably attached to outer surface 31a of housing 31, similar to rotary motor 3A described above, and for convenience of illustration, only core 13, which is U-shaped in plan view and which constitutes the power generating device, is shown in Fig. 13. With this configuration, rotary motor 3B, like the above, effectively generates electromotive force in the power generating device (see also power generating device 10A shown in Fig. 5) constituted by core 13 due to electromagnetic induction in response to changes in leakage magnetic flux M leaking from rotor 34, which is a rotating body, thereby enabling efficient and stable power generation using leakage magnetic flux M.

[0047] Here, even if the rotary motor, which is the power equipment, is a DC motor with an electromagnetic coil and commutator arranged on the rotor side, it is possible to generate electromotive force in the generator by electromagnetic induction according to changes in leakage magnetic flux leaking from the electromagnetic coil arranged on the rotor. The above-mentioned changes in leakage magnetic flux occur depending on the power generation cycle (power generation frequency) of the rotary motor, i.e., the rotation speed.

[0048] In this embodiment, a rotary motor having a rotor as a moving body is used as an example of the power equipment to which the leakage flux power generating device can be attached, but the power equipment in this invention is not limited to this. In addition to rotary motors, the power equipment in this invention can also be various other power equipment that operates by electromagnetic force and is expected to leak magnetic flux, such as linear motors having a sliding element that moves linearly as a moving body, or electromagnetic solenoids. Any of these power equipment can be attached and used with a leakage flux power generating device, the details of which will be described later.

[0049] 1, 3, 6, and 7 show examples in which a power equipment system (see reference numeral 1 in FIG. 1) is configured by attaching a rotary motor (3, 3A) to a support base 2, but this support base 2 is not essential. For example, it is possible to omit the support base 2 by arranging a mounting fixture or the like at the installation position of the rotary motor.

[0050] The rotary motor, which is the power equipment of this embodiment, may be equipped with one or more of the above-described power generating devices, and the number of devices to be equipped can be determined taking into consideration the operating voltage (current) of the various boards that require power supply from the power generating devices. For example, in the example shown in Figures 1 and 3, one power generating device 10 is attached to each outer surface 31a of the housing 31 of the rotary motor 3, while in the example shown in Figure 7, three power generating devices 10A are attached to the outer surface 31a of the housing 31 of the rotary motor 3. In this way, by attaching multiple power generating devices to the rotary motor 3, it is possible to supply power to various boards that operate at high voltages or high currents, and by using multiple power generating devices alone or in appropriate combination, it is also possible to supply power corresponding to multiple operating voltages and operating currents.

[0051] <Leakage magnetic flux power generation device> The configuration of the leakage magnetic flux power generating apparatus (power generating apparatus) of this embodiment will be described in detail mainly with reference to Figs. 2, 5, and 8 to 12 (also see Figs. 1, 3, 4, 6, 7, and 13 which explain the power equipment to which the power generating apparatus is attached). FIG. 2 is a diagram for explaining the power generating device 10 of this embodiment, and is a cutaway view showing an example in which a core 12 made of a rod-shaped member is inserted into the internal space 11C of the winding unit 11 (winding 11B) shown in FIG. FIG. 5 is a diagram for explaining a power generating device 10A of this embodiment, and is a cutaway view showing an example in which a core 13 made of a U-shaped member is inserted into the internal space of a winding unit 11. FIG. 8 is a diagram for explaining a power generating device 10A of this embodiment, and is a cutaway view showing an example in which a core 13 made of a U-shaped member is inserted so as to span the internal spaces 11C, 11C of a plurality of winding units 11, 11. FIG. 9 is a schematic view showing only the rod-shaped core 12 provided in the power generating device 10 of the example shown in FIG. FIG. 10 is a schematic diagram showing the relationship between the direction of leakage magnetic flux M and core 13 made of a U-shaped member provided in power generating device 10A of the example shown in FIG.

[0052] The power generating device of this embodiment is used by being attached to a power machine having a moving body that performs rotational or linear motion by electromagnetic force. The power generating device of this embodiment is configured to include one or more windings that generate electromotive force through electromagnetic induction due to changes in leakage magnetic flux leaking from a power device in accordance with the rotational or linear motion of a moving body.

[0053] That is, the power generating device 10 of this embodiment shown in detail in Fig. 2 is attached to a rotary motor (see reference numeral 3 in Fig. 3 or reference numeral 3A in Fig. 4), which is a power device equipped with a rotor (rotor: see reference numeral 33 in Fig. 4) as a moving body that performs rotational motion by electromagnetic force, as in the example shown in Fig. 3 or 4. In the illustrated example, the power generating device 10 is attached to the outer surface 31a of a housing 31 of the rotary motor 3, 3A. The power generating device 10 of this embodiment is generally configured to include a winding unit 11 (winding 11B) that generates an electromotive force by electromagnetic induction due to changes in leakage magnetic flux leaking from the rotary motor 3A in accordance with the rotational motion of the rotor 33 illustrated in Fig. 4. In the example shown in Fig. 4, a rod-shaped core 12 is inserted into an internal space 11C of the winding unit 11, and one end 12a of the core 12 serves as an attachment portion for the outer surface 31a of the housing 31 of the rotary motor 3. Although not shown in Figs. 1, 3, 4, etc., the one end 12a of the core 12 is attached to the outer surface 31a of the housing 31 of the rotary motor 3, 3A by, for example, a bolt, a jig, or adhesive.

[0054] The winding unit 11 is composed of a coil bobbin 11A and a winding 11B wound around the coil bobbin 11A.

[0055] Coil bobbin 11A is a bobbin-shaped member with flanges 11c formed on both ends of cylindrical body 11a, and functions as a core material for winding winding 11B. An axial hole 11b is formed inside body 11a, and this axial hole 11b ensures a cylindrical internal space 11C into which core 12, described in detail below, can be inserted. The material of the coil bobbin 11A is not particularly limited, and resin materials that are generally used in electromagnetic coils and have excellent heat resistance and electrical resistance can be used without any restrictions, and metal materials that have excellent heat resistance and mechanical strength properties can also be used.

[0056] Winding 11B is wound around body 11a of coil bobbin 11A, and has the effect of generating electromotive force through electromagnetic induction due to changes in leakage magnetic flux leaking from rotary motor 3. Furthermore, flange 11c prevents winding 11B from protruding from body 11a.

[0057] The number of turns (number of turns) n of winding 11B is not particularly limited, and is preferably set appropriately taking into consideration the strength of magnetic flux that is expected to leak from a power device such as a rotary motor. On the other hand, depending on the structure of the power device, the leakage magnetic flux leaking to the outside of the housing may be weak, and in such cases, it is preferable to set the number of turns n of winding 11B to be larger.

[0058] Here, the voltage generated by electromagnetic induction in winding 11B can be expressed by the following equation (1): That is, it is known that the voltage of the electromotive force caused by electromagnetic induction is proportional to the number of turns n. e=-n(Δφ / Δt) [V] ·····(1) In the above equation (1), e is the voltage (V), n is the number of turns of winding 11B, and Δφ / Δt is the change in magnetic flux of winding 11B per unit time.

[0059] The wire material constituting winding 11B is not particularly limited, and any enameled wire used for windings of general power generating devices that utilize electromagnetic induction can be used without any restrictions.

[0060] As described above, core 12 is provided so that at least a portion thereof is inserted into internal space 11C defined by axial hole 11b in coil bobbin 11A constituting winding unit 11, and is a rod-shaped member formed into a round bar in the examples shown in Figures 2 and 9. Although not shown in Figure 2, core 12 can be fixed in axial hole 11b of coil bobbin 11A by fixing means such as adhesive or adhesive tape.

[0061] Core 12 has the effect of concentrating leakage magnetic flux in internal space 11C of winding unit 11 (winding 11B) and increasing the magnetic flux density, thereby improving the power generation efficiency of winding 11B. Furthermore, by providing core 12, leakage magnetic flux leaking from the rotary motor can be efficiently guided to winding 11B, so that sufficient power generation efficiency can be obtained even if the leakage magnetic flux leaking from the rotary motor is weak. Furthermore, the core 12 provided in the power generating device 10 of this embodiment functions as a mounting portion in the power generating device 10 by having one end 12a attached to the outer surface 31a of the housing 31 of the rotary motor 3, which is the power device.

[0062] The material of the core 12 is not particularly limited, but is preferably a soft magnetic material with high magnetic permeability and low coercive force, and more preferably a soft magnetic material with high saturation magnetic flux density. Examples of such soft magnetic materials include iron-nickel alloys, iron-cobalt alloys, iron-chromium alloys, and amorphous metals. These alloy materials are preferred as core materials because they are easy to process and can be easily formed into a desired shape.

[0063] Furthermore, the core is not limited to a linear rod-shaped member as shown in Fig. 2 etc., but is more preferably a shape that can capture leakage magnetic flux more efficiently and that can reduce the size of the protrusion from the rotary motor, which is a power device. The details of such a core shape will be described later, but an example is a U-shaped core as seen from the front, as shown in Fig. 5 etc.

[0064] Furthermore, the cross-sectional shape of the core is not limited to the roughly circular shape shown as the end face shape in Figures 2 and 9. The cross-sectional shape of the core can be determined taking into consideration the amplification efficiency of the change in leakage magnetic flux, which will be described later, and in addition to the circular shape described above, various shapes such as a triangular, square, or polygonal cross section are also possible.

[0065] The operation of generating electromotive force by electromagnetic induction due to changes in leakage magnetic flux using the power generating device 10 shown in detail in FIG. 2 will be explained using an example in which the power generating device 10 is attached to a rotary motor 3A consisting of a DC motor as shown in FIG.

[0066] First, when current is applied to the electromagnetic coils 32a of the stator 32, the rotor 33 of the rotary motor 3A rotates around the rotary shaft 36 in the direction R indicated by the arrow in FIG. 4. As the rotor 33 rotates due to repeated magnetic attraction and repulsion between the magnetic fields generated by the electromagnetic coils 32a and the permanent magnets 33a, a change occurs in the leakage magnetic flux (see also the symbol M in FIG. 13 ) leaking from the permanent magnets 33a of the rotor 33 and / or the electromagnetic coils 32a of the stator 32 toward the outside of the housing 31. This change in leakage magnetic flux is captured by the winding 11B of the power generator 10 attached to the outer surface 31a of the housing 31, generating an electromotive force in the winding 11B due to electromagnetic induction. That is, the winding 11B generates electricity through electromagnetic induction due to the change in the leakage magnetic flux leaking from one or both of the electromagnetic coils 32a and the permanent magnets 33a of the rotary motor 3A.

[0067] The power obtained by the power generation action as described above is output to the outside from the power generation device 10 via lead wires (not shown). Although not shown, this power can be supplied to various sensor drive circuit boards, data processing and communication boards, etc. attached to the rotary motor as drive power for operating these boards.

[0068] The power generating device of this embodiment is not limited to the configuration exemplified in Fig. 2 etc. In this embodiment, for example, by arranging a plurality of end faces of a core facing the leakage magnetic flux leaking from a rotary motor and adopting a configuration in which the core is attached to the rotary motor so that the change in the leakage magnetic flux occurs at different times on each end face, it is possible to amplify the change in magnetic flux in the core.

[0069] 5 and 6, the present embodiment can be configured to include a core 13 made of a U-shaped member when viewed from the front, with one end 13a and the other end 13b disposed at both ends of the core 13 each serving as an attachment portion for the outer surface 31a of the housing 31 of the rotary motor 3. The core 13 in the illustrated example is a so-called yoke-structure core having a horizontal portion 13A and two vertical portions 13B extending substantially perpendicularly from both ends of the horizontal portion 13A.

[0070] One end 13a and the other end 13b of the core 13 are attached to the outer surface 31a of the housing 31 of the rotary motor 3, respectively. Here, it is more preferable to attach one end 13a and the other end 13b of the core 13 at positions where the timing of the change in leakage magnetic flux is different, as described above, from the viewpoint of amplifying the magnetic flux change in the core and improving power generation efficiency.

[0071] That is, when the power generating device 10A (see core 13 in FIG. 5) is arranged such that the leakage magnetic flux M toward one end 13a and the leakage magnetic flux M toward the other end 13b change at different times, the above-mentioned magnetic flux change is amplified, thereby further improving the power generation efficiency of the power generating device 10A.

[0072] Explaining this in more detail with reference to the example shown in Fig. 13, first, as rotor 34 rotates, the south and north poles of rotor 34 alternately approach and move away from one end 13a or the other end 13b, which is located on each of two vertical portions 13B of core 13. In this way, different magnetic poles alternately approach and move away from one end 13a and the other end 13b, causing leakage magnetic flux M captured at one end 13a and the other end 13b to alternately change. Accordingly, the change in leakage magnetic flux M propagating through core 13 from one end 13a and the other end 13b is amplified, and the electromotive force in winding 11B shown in Fig. 5 also increases, enabling more efficient power generation.

[0073] 7, a plurality of power generating devices of this embodiment can be attached to a rotary motor 3, which is a power device. In the illustrated example, a total of three power generating devices 10A are attached to the outer surface 31a of the housing 31 of the rotary motor 3, and one end 13a and the other end 13b of the core 13 are attached to the outer surface 31a of the housing 31 with the horizontal portion 13A of each core 13 and the winding axis of the winding 11B (winding unit 11: see FIG. 6) oriented along the rotation direction R of the rotary motor 3. In the illustrated example, the three power generating devices 10A are arranged at equal intervals along the rotation direction R of the rotary motor 3.

[0074] 7, when a plurality of power generating devices 10A are attached to a rotary motor 3, for example, two or three power generating devices 10A can be connected in series to supply high-voltage power to a board with a higher operating voltage. Also, for example, two or three power generating devices 10A can be electrically connected in parallel to supply high-current power to a board with a higher operating current. On the other hand, a board with a relatively low operating voltage (or operating current) may be supplied with power output solely from one power generating device 10A.

[0075] 7 shows an example in which three power generators 10A are attached to the outer surface 31a of the housing 31 of the rotary motor 3, but the number of power generators used when multiple power generators are used is not particularly limited. For example, a configuration using two power generators or a configuration using four or more power generators may be adopted. Furthermore, when multiple power generators are installed on the rotary motor 3, their arrangement is not limited to an arrangement along the rotation direction R as in the illustrated example. Taking into consideration the circumstances of the space around the rotary motor 3, for example, they may be arranged in parallel in a direction perpendicular to the rotation direction R or arranged in a spiral. Furthermore, in this embodiment, as long as each power generator 10A attached to the rotary motor 3 can capture changes in leakage magnetic flux, the arrangement is not limited to the aligned arrangement as described above.

[0076] 8, the present embodiment may also employ a configuration in which a plurality of windings 11B are provided, and at least a portion of the core 13 is inserted so as to span the internal spaces of each of the plurality of windings 11B, thereby arranging the plurality of windings 11B in series. In the illustrated example, the power generating device 10B has two winding units 11 each having a winding 11B, and the horizontal portions 13A of the core 13 are inserted so as to span the internal spaces 11C of each of the two winding units 11. In the illustrated example, the power generating device 10B is configured so that one end 13a and the other end 13b of the vertical portions 13B of the core 13 can be attached to the outer surface of the housing of the rotary motor.

[0077] 8, the above configuration makes it possible to supply power of different voltages without providing a voltage adjustment circuit, for example, by arranging a plurality of winding units 11 having windings 11B with the same or different impedances and appropriately changing the electrical connection paths of the plurality of winding units 11 (windings 11B).That is, in power generation device 10B, it is possible to output, for example, an overall potential obtained by electrically connecting two windings 11B, 11B of winding units 11, 11 provided at two locations in series or parallel, or a potential at the midpoint of windings 11B, 11B, i.e., a single potential of one winding 11B.

[0078] Furthermore, with the above configuration, for example, the output voltage can be changed appropriately using multiple windings 11B with the same impedance, making it possible to drive multiple different types of substrates with different drive voltages with a single power generation device.

[0079] In addition, in the power generating device 10B shown in FIG. 8, two windings 11B are arranged in series, but the number of windings 11B arranged is not limited to this, and for example, three or more windings 11B may be arranged in series.

[0080] There is no particular limitation on the direction in which power generating devices 10A and 10B of the present embodiment are attached to outer surface 31a of housing 31 of the rotary motor. On the other hand, in order to efficiently capture leakage magnetic flux leaking from the rotary motor and generate electricity efficiently, it is more preferable to arrange the power generating devices so that horizontal portion 13A of core 13 and the winding axis of winding 11B provided in power generating devices 10A and 10B are aligned with the direction of rotation (see symbol R in FIG. 4 ) of the rotor (see symbol 33) of the rotary motor.

[0081] According to the power generation devices 10, 10A, and 10B of this embodiment, the above-mentioned configuration allows them to be used as AC power sources to drive boards with different operating voltages, such as drive boards for various sensors provided to observe the state of power equipment such as rotary motors, and data processing / communication boards.

[0082] Furthermore, according to the power generation devices 10, 10A, and 10B of the present embodiment, they can be easily attached to a rotary motor or other common equipment using bolts or the like, allowing for simple installation along with a sensor drive board or other boards to which the drive power is supplied. This allows for easy installation of the power generation device and various boards without the need for wiring work or securing space. Furthermore, the ease of maintenance is improved because the work of battery replacement and the like can be eliminated. Therefore, it is possible to easily obtain operational information about the rotary motor, which is a power device, from various sensors using a simple configuration, and it is also possible to reduce the workload on the user.

[0083] On the other hand, the power generating device of this embodiment does not generate electricity when the rotary motor, which is the power equipment, is stationary because there is no change in leakage magnetic flux, making it safe even when the power equipment is not in use.

[0084] In this embodiment, an example is given in which the power generator is attached to the outer surface of the housing of a rotary motor, which is a power device, as shown in Figures 3 and 4 as well as Figure 1, but the present invention is not limited to this. The attachment position of the power generator in the rotary motor is not particularly limited as long as it is a position where leakage magnetic flux can be efficiently captured, and for example, the power generator may be attached to a stator provided inside the rotary motor or in the vicinity thereof.

[0085] Furthermore, although detailed illustrations are omitted, when the power generating device of this embodiment is attached to a power machine consisting of a linear motor having a sliding element as a moving body, the attachment direction of the power generating device to the linear motor is not particularly limited. On the other hand, as in the case of a rotary motor, in order to efficiently capture leakage magnetic flux leaking from the linear motor and generate electricity efficiently, it is more preferable to position the power generating device so that the horizontal part of the core, which is U-shaped in plan view in the power generating device, and the winding axis of the winding are aligned along the direction of movement caused by the linear motion of the sliding element.

[0086] In addition, in this embodiment, for example, it is also possible to adopt a configuration including a battery (not shown) for storing the electric power generated by the power generating device using leakage magnetic flux. By adopting such a configuration, it is possible to construct a wireless temperature sensor by supplying the power stored in the battery to, for example, drive a rotary motor or a temperature sensor nearby.Furthermore, the power stored in the battery can also be used as a power source for detecting the status of power equipment during a power outage, making it possible to construct a device that is resistant to disasters, etc.

[0087] <Action and effect> As described above, leakage magnetic flux power generating devices (power generating devices) 10, 10A, 10B of this embodiment employ a configuration including winding 11B that generates electromotive force by electromagnetic induction due to changes in leakage magnetic flux leaking from power equipment such as rotary motors 3, 3A, 3B as a result of the rotational motion of a rotor, which is a moving body. By employing a configuration including winding 11B that can generate electricity due to changes in leakage magnetic flux and attaching power generating devices 10, 10A, 10B to rotary motors 3, 3A, 3B, etc., it is possible to obtain excellent power generation efficiency, and by optimizing the number of windings 11B arranged, it is also possible to simultaneously supply power of multiple different voltages. Therefore, the power generating devices 10, 10A, 10B can be easily attached to power equipment such as rotary motors 3, 3A, 3B, and do not require the hassle of wiring, space allocation, or battery replacement, and are highly efficient in power generation.They can also be used with a variety of boards equipped with power supply ICs with different operating voltages, making them highly versatile and realizable with a simple configuration.

[0088] Furthermore, the power equipment of this embodiment is comprised of rotary motors 3, 3A, 3B, etc., to which the power generating devices 10, 10A, 10B according to the present invention are attached, so that the power generated efficiently in the power generating devices 10, 10A, 10B can be stably supplied to, for example, a sensor drive board, a data processing / communication board, etc. Furthermore, even if the various boards described above are equipped with power supply ICs of different operating voltages, by optimizing the number of windings 11B provided in the power generating devices 10, 10A, 10B, etc., it is possible to operate the various boards while simultaneously supplying power of different voltages. Therefore, it is possible to realize a powered device having a variety of functions obtained by the operation of various boards without requiring a commercial power source or batteries.

[0089] <Modifications of the present invention> Although the embodiments of the present invention have been described in detail above, the leakage flux power generating device and power equipment of the present invention are not limited to the above embodiments, and various changes and modifications can be made without departing from the principles of the present invention and the scope of the appended claims.

[0090] For example, in the above embodiments, the power generating device 10 includes a core 12 made of a rod-shaped member having a round bar shape as shown in FIG. 2, and the power generating devices 10A and 10B include a core 13 made of a U-shaped member when viewed from the front as shown in FIG. 5 or 8, but the general shape of the core inserted into the internal space 11C of the winding unit 11 is not limited to these shapes. For example, the power generating device may be constructed using a core 14 that is roughly E-shaped when viewed from the front, as shown in FIG. 11, or may be constructed using a core 15 that is roughly C-shaped and rounded when viewed from the front, as shown in FIG. 12. That is, the shape of the core provided in the power generating device can be designed appropriately, taking into consideration, for example, the shape of the power equipment (rotary motor, linear motor, etc.) to which it is to be attached, the direction of the leakage magnetic flux, etc.

[0091] In the above embodiment, the core is inserted into the internal space of the winding (winding unit) and the end of the core is attached to the rotary motor, which is a power device. However, the power generator according to the present invention may also be configured without the core. In such a case, for example, although not shown in the drawings, a mounting jig or adhesive tape that can be attached to the outer surface of the housing of the rotary motor while holding the winding (winding unit) may be used. In addition, when a configuration such as the one described above is adopted in which an electromotive force is generated only by windings without using a core, from the viewpoint of power generation efficiency, it is necessary for leakage magnetic flux leaking from the power equipment to pass through in the direction of the winding axis of the windings. Therefore, when such a configuration is adopted, it is preferable to mount the power generator so that the winding axis of the windings is oriented perpendicular to the rotation direction of the rotor in a rotary motor or the direction of movement due to the linear motion of the slide slider in a linear motor.

[0092] The power generation device according to the present invention may further include a power generation amount indicator (not shown) for displaying the amount of power generated in the windings to check the power generation status of the power generation device. Such a power generation amount indicator functions as a direct power generation monitor, either directly connected to or integrated with the power generation device. Specifically, the power generation amount indicator may be, for example, an LED electrically connected to the windings of the power generation device. By configuring the power generation amount indicator as an LED, the user can visually check the brightness and easily grasp the approximate amount of power generation, and it also has the advantage of being inexpensive and not requiring complex circuitry. [Example]

[0093] The present invention will be explained in more detail below by showing examples of the leakage magnetic flux power generating device and power equipment of the present invention. However, the configurations of the leakage magnetic flux power generating device and power equipment of the present invention are not limited by the specifications and conditions described in the following examples.

[0094] Example 1 In Example 1, the power generating devices 10, 10A shown in Figure 2 or Figure 5 were fabricated using the method and conditions described below, and these power generating devices 10, 10A were each attached to the outer surface 31a of the housing 31 of the rotary motor 3B shown in Figure 13 (see also the power generating device 10A attached to the rotary motor 3 in Figure 6). Then, by using the method described below, the amount of power generated by leakage magnetic flux when rotary motor 3B was rotated under predetermined conditions was measured, and differences in the amount of power generated due to differences in core shape (structure) were investigated.

[0095] [1] Method and conditions for producing the power generation device In Example 1, a winding unit 11 in which a winding 11B is wound around a coil bobbin 11A, and cores 12 and 13 inserted into an internal space 11C of the winding unit 11 (winding 11B) were manufactured according to the following specifications. (1) Winding (common to generators 10 and 10A) Wire type: UEW (polyurethane copper wire (enameled wire)) Wire diameter: φ0.16mm Impedance: 9.8 (ohms) Number of turns: n = 160 (evenly wound around the body of the coil bobbin) (2) Coil bobbin (same as above) Outer diameter of body 11a: 17.0mm Inner dimension between flanges 11c: 5.0mm Inner diameter of shaft hole 11b (internal space 11C): 15.0 mm (3) Core (a) Core 12 (rod-shaped member; see the power generation device 10 shown in Figures 2 and 9, etc.) Cross-sectional shape: circular ·Diameter:φ10mm Length: 55mm Material: Permalloy B (Fe-45Ni) (b) Core 13 (U-shaped member; see power generating device 10A shown in Figures 5 and 6) Cross-sectional shape: circular ·Diameter φ: 10mm Length: Horizontal 35mm, Vertical 10mm Material: Permalloy B (Fe-45Ni)

[0096] [2] Rotary motor (power equipment) In Example 1, an AC speed control motor (manufactured by Oriental Motor Co., Ltd.: M590-001C; single phase) was prepared as the rotary motor 3B (FIG. 13) which is the power device. Then, the power generating device 10 or the power generating device 10A described in [2] above was individually attached to the outer surface 31a of the housing 31 of this rotary motor 3B (see also FIGS. 3 and 5). In this case, as shown in the example of FIG. 3, the power generating device 10 was attached such that one end 12a of the core 12 was in an upright position relative to the outer surface 31a of the housing 31 of the rotary motor 3B(3). Furthermore, for the power generating device 10A, one end 13a and the other end 13b of the core 13 were attached to the outer surface 31a of the housing 31 of the rotary motor 3B in such a manner that the winding axis of the winding 11B and the horizontal portion 13A of the core 13 were aligned along the rotation direction of the rotor 34 (see also Figure 6). In the above, each of the cores 12 and 13 is attached and fixed to the outer surface 31a of the housing 31 of the rotary motor 3B with adhesive tape.

[0097] [3]Measurement method Using the power generating device 10 and power generating device 10A attached to the rotary motor 3B as described above, the power generated by electromagnetic induction due to leakage magnetic flux was measured using an oscilloscope (manufactured by KEYSIGHT Corporation; model number: DSOX1204G) to obtain an electromotive force waveform showing the relationship between the measured voltage (V) and the rotation time (sec) of the rotary motor 3B. At this time, the rotation speed of the rotary motor 3B was set to 1400 rpm (rotation output: 100%). The above electromotive force waveform is shown in the graph of FIG.

[0098] [4] Test results In the electromotive force waveform shown in the graph of FIG. 14, the voltage generated by the power generation device 10 and the voltage generated by the power generation device 10A are shown so that they can be compared as waveforms on the same time axis (rotation time). As shown in the graph of Figure 14, it was confirmed that the power generating device 10A equipped with a core 13 that is U-shaped (yoke structure) when viewed from above can obtain a voltage that is approximately 1.5 times higher in terms of power ratio when the load terminal is open compared to the power generating device 10 equipped with a round bar-shaped core 12.

[0099] From the results of Example 1, it was confirmed that when a configuration in which a core is placed in the internal space of the winding is adopted as a power generating device, by making the shape of the core U-shaped when viewed from the front and optimizing the orientation of the horizontal part of the core and the winding axis of the winding, the amount of power generated can be increased compared to the case in which the shape of the core is a round bar. 6 and other examples employ a core 13 that is U-shaped when viewed from the front, with one end 13a and the other end 13b of the core 13 attached to the outer surface 31a of the housing 31 while the horizontal portion 13A of the core and the winding axis are oriented along the rotational direction of the rotor provided in the rotary motor. It has been confirmed that this configuration produces a higher voltage than the power generator 10 shown in FIG. 3 , in which the end 12a of the core 12 is attached to the outer surface 31a of the housing 31 so that the longitudinal direction of the rod-shaped core 12 and the winding axis are oriented perpendicular to the rotational direction of the rotor. This is likely because attaching both ends of the core to the rotary motor housing and aligning the horizontal portion of the core and the winding axis with the rotational direction of the rotary motor allows for efficient capture of changes in magnetic flux leaking from the electromagnetic coils and permanent magnets of the rotary motor, thereby improving power generation efficiency.

[0100] Furthermore, in Example 1, an experiment was also carried out to acquire an electromotive force waveform in a similar manner to the above, using the above power generating device 10A and attaching it to the outer surface 31a of the housing 31 of the rotary motor 3B in an arrangement such that the horizontal portion 13A of the core 13 and the winding axis of the winding 11B were perpendicular to the rotation direction (see symbol R in FIGS. 3 and 6) of the rotor 34. As a result, it was confirmed that a higher voltage could be obtained when the horizontal portion 13A of the core 13 and the winding axis of the winding 11B were arranged along the rotation direction of the rotor 34, as described above, than when the horizontal portion 13A and the winding axis were arranged perpendicular to the rotation direction.

[0101] As described above, in Example 1, it was confirmed that the electromotive force varies significantly depending on the shape and orientation of the core (the direction of the winding axis). Specifically, it was confirmed that the electromotive force is increased by using a core that is U-shaped when viewed from the front and by arranging the longitudinal direction (horizontal portion) of the core and the winding axis of the winding along the direction of rotation of the rotor of the rotary motor. On the other hand, it was confirmed that it is difficult to generate electricity when the horizontal portion of the core and the winding axis of the winding are perpendicular to the direction of rotation of the rotor of the rotary motor. On the other hand, when a round bar-shaped core is used and only one end of the core is attached to the outer surface of the housing of the rotary motor, the longitudinal direction of the core and the winding axis are perpendicular to the direction of rotation of the rotor. However, power generation is possible even with this arrangement. However, with this configuration, the amount of power generated is smaller than when a U-shaped core when viewed from the front is used and the horizontal portion of the core and the winding axis of the winding are arranged along the direction of rotation of the rotor.

[0102] Furthermore, in Example 1, from the electromotive force waveform shown in the graph of FIG. 14, it was confirmed that when the power generating device of the present invention was attached to an AC motor and used, a waveform was generated in which electromotive force was generated in the windings due to leakage magnetic flux from the electromagnetic coil provided in the stator and the permanent magnet provided in the rotor.

[0103] Furthermore, although detailed illustration is omitted in Example 1, an experiment was also carried out to obtain an electromotive force waveform in a state in which core 12 was removed from power generating device 10 shown in Fig. 2 and a single winding unit 11 was attached to rotary motor 3B with adhesive tape. As a result, it was confirmed that by adopting a configuration in which core 12 for magnetic flux convergence is inserted into internal space 11C of winding unit 11, the electromotive force generated by winding 11B is approximately twice as large as when no core is provided.

[0104] <Example 2> In Example 2, a power generating device was fabricated using the power generating device 10 shown in Figure 2 as a base, using the method and conditions described below, and although detailed illustration is omitted, in which cores 12 were inserted into internal spaces 11C of two winding units 11 and windings 11B were arranged in series, and this power generating device was attached to the outer surface 31a of the housing 31 of the rotary motor 3B shown in Figure 13. In this case, the number of turns n of the winding 11B included in each of the two winding units 11 was adjusted so that the impedance of the winding 11B included in one winding unit 11 was 9.8 ohms, and the impedance of the winding 11B included in the other winding unit 11 was 170 ohms. That is, in Example 2, the number of turns n of the winding 11B was adjusted taking into consideration the relationship expressed by the following equation {e=-n(Δφ / Δt)[V]} (see equation (1) described above).

[0105] Also in Example 2, an AC speed control motor (M590-001C manufactured by Oriental Motor Co., Ltd.) similar to that in Example 1 was prepared as the rotary motor 3B, which is the power device. Next, one end 12a of the core 12 provided in the power generating device 10 having the above-mentioned two winding units 11 was attached to the outer surface 31a of the housing 31 of this rotary motor 3B so that the longitudinal direction of the core 12 and the winding axis of the winding 11B were arranged perpendicular to the rotation direction R of the rotor 33.

[0106] Then, using the same conditions and method as in Example 1, electromotive force waveforms indicating the amount of power generated by leakage magnetic flux when rotary motor 3B was rotated under predetermined conditions were obtained for each of two windings 11B with different impedances, and the results are shown in the graph of Figure 15.

[0107] In the electromotive force waveform shown in the graph of Figure 15, the voltage of the power generated by one winding unit 11 having a winding 11B with low impedance (9.8 ohms) and the voltage of the power generated by the other winding unit 11 having a winding 11B with high impedance (170 ohms) are shown so that they can be compared as waveforms on the same time axis (rotation time). As shown in the graph of FIG. 15, it was confirmed that a winding unit 11 having a winding 11B with a high impedance (170 ohms) can obtain a higher voltage than a winding unit 11 having a winding 11B with a low impedance (9.8 ohms).

[0108] Furthermore, in Example 2, by conducting the above experiment, it was confirmed that it is possible to adjust the output (voltage, current) by providing multiple windings with the same specifications and electrically connecting them in series or parallel. Furthermore, in Example 2, it was confirmed that adjacent windings did not affect each other's output characteristics.

[0109] Therefore, it became clear that by configuring the power generation device with multiple windings with different impedances, i.e., multiple windings with different winding numbers n, it is possible to simultaneously supply power at multiple different voltages. In other words, since it is possible to simultaneously output power at various voltages and currents from a single power generation device (power supply), it is clear that it will be possible to simultaneously operate multiple IoT communication devices with different product specifications, for example.

[0110] Example 3 In Example 3, a rotary motor 3B shown in FIG. 13 was prepared in the same manner as in Example 1, in which the power generating device 10 shown in FIG. 2 was attached to the outer surface 31a of the housing 31 (see also FIG. 3). Then, an electromotive force waveform showing the amount of power generated by leakage magnetic flux was obtained under the same conditions and in the same manner as in Example 1, except that voltage measurements were performed while changing the rotation speed (rotational speed) of rotary motor 3B to 100%, 80%, and 50% of the maximum output, and the results are shown in the graph of Figure 16.

[0111] In the electromotive force waveform shown in the graph of FIG. 16, the voltage measured at each rotation speed is shown on the same time axis (rotation time) so that it can be compared. As shown in the graph of FIG. 16, regardless of the rotation speed of rotary motor 3B, the power generation frequency was 50 Hz, the same as the frequency of the commercial power supply that drove rotary motor 3B. On the other hand, from the electromotive force waveform shown in the graph of Figure 16, it was also confirmed that as the rotation speed increases, the voltage increases and the amount of power generation increases.

[0112] In Example 3, it was confirmed that the electromotive force waveform, that is, the strength of the leakage magnetic flux, hardly changes when the rotation speed of the rotary motor is in the range of low speed (50%) to medium speed (80%). Furthermore, in Example 3, when only rotary motor 3B was powered on and maintained in a non-rotating state, no output was observed from winding 11B. This suggests that the change in magnetic flux leaking from a non-rotating AC motor is small. On the other hand, within the above rotational speed range, although output from winding 11B was confirmed, the voltage was low. From this, it is thought that when the rotational speed of the AC motor is medium or lower, the leakage magnetic flux is limited to the magnetic field of the electromagnetic coil in the stator. It can be seen that when the rotation speed of rotary motor 3B exceeds medium speed (80%), the output voltage from winding 11B increases. This suggests that when rotary motor 3B is rotating at high speed, leakage magnetic flux is generated not only from the magnetic field in the stator but also from the magnetic field in the rotor.

[0113] From the results of Example 3, it was confirmed that the frequency of the power generated using the magnetic flux leaking from the rotary motor was the same as the frequency of the commercial power supply that drives the rotary motor.

[0114] Example 4 In Example 4, first, a sample of the power generating device 10 shown in FIG. 2 was produced. Next, one end 12a of the core 12 provided in the power generation device 10 was attached to the outer surface of the housing of an AC induction motor (3-phase; 4-pole; maximum 400 W) provided in a dust collector installed in a factory in the same manner as in Example 1 (see also Figure 1, etc.), although detailed illustrations are omitted. The rotation speed of the rotary motor was then kept constant at 1410 rpm, and an electromotive force waveform indicating the amount of power generated by leakage magnetic flux was obtained under the same conditions and in the same manner as in Example 1, and the results are shown in the graph of FIG.

[0115] 17, the power generation frequency of power generation device 10 attached to a rotary motor made of an AC induction motor was 50 Hz, the same as the frequency of the commercial power supply that drove the rotary motor, similar to the results in Example 3. This is thought to be a power generation cycle that depends on changes in the magnetic field generated by the electromagnetic coil inside the AC induction motor.

[0116] <Example 5> In Example 5 as well, first, a sample of the power generating device 10 shown in FIG. 2 was produced. Next, one end 12a of the core 12 provided in the power generating device 10 was attached to the outer surface 31a of the housing 31 of the rotary motor 3A shown in Fig. 4 (see also the power generating device 10 attached to the rotary motor 3 in Fig. 3). The rotary motor 3A prepared in Example 5 is a DC speed control motor (PWM control: pulse width modulation) having a 9-slot and 6-pole structure as shown in Fig. 4, and is a rotary motor with specifications of a maximum applied voltage of 10 V and a maximum rotation speed of 15,200 rpm under no load.

[0117] The rotational speed (rotational speed) of rotary motor 3A was then varied from the maximum rotational speed to approximately low speed (rotational speed - slow), medium speed (rotational speed - medium), and high speed (rotational speed - fast), and electromotive force waveforms indicating the amount of power generated by leakage magnetic flux and the power generation frequency were obtained under the same conditions and in the same manner as in Example 1, etc., and the results are shown in the graphs of Figures 18(a) to 18(c). Here, Figure 18(a) is a graph showing the electromotive force waveforms when the rotational speed is slow (low speed), Figure 12(b) is a graph showing the electromotive force waveforms when the rotational speed is medium (medium speed), and Figure 12(c) is a graph showing the electromotive force waveforms when the rotational speed is fast (high speed).

[0118] 18(a), 18(b), and 18(c), the power generation period (power generation frequency) becomes shorter as the rotation speed of rotary motor 3B increases, but the maximum voltage remains almost constant. This shows that, for example, in power generation using leakage magnetic flux from a DC motor with a permanent magnet arranged on the rotor side, the power generation period depends on the rotation speed of the DC motor, but the amount of leakage magnetic flux is constant regardless of the rotation speed, so the maximum voltage remains at the same level regardless of the rotation speed.

[0119] <When attaching a generator to an AC synchronous motor> In the above examples, no experiments were conducted using an AC synchronous motor as the rotary motor (power machine). On the other hand, an AC synchronous motor has a structure in which a permanent magnet is arranged in a rotor, and the rotor is rotated by changing the frequency of a current applied to an electromagnetic coil arranged in a stator. Therefore, the operating principle is similar to that of a DC motor. Therefore, when the power generating device of the present invention is attached to an AC synchronous motor and power is generated using leakage magnetic flux, the power generation frequency can be estimated to depend on the rotation speed. Furthermore, it is believed that efficient power generation is possible, just as when a power generating device is attached to a DC motor. [Industrial Applicability]

[0120] As described above, the leakage flux power generation device of the present invention is easy to install in power equipment, does not require the hassle of wiring, does not require space allocation, does not require battery replacement, etc., has excellent power generation efficiency, and is compatible with a wide variety of boards equipped with power supply ICs of different operating voltages, making it highly versatile. Therefore, when installed in power equipment such as rotary motors or linear motors, the leakage flux power generation device of the present invention is extremely useful for driving boards with different operating voltages, such as drive boards for various sensors provided to observe the state of such power equipment, or data processing / communication boards. [Explanation of symbols]

[0121] 1...Power equipment system 2…Support stand 3, 3A, 3B...Rotary motor (power equipment) 31...Case 31a…External surface 32...Stator 32a...Electromagnetic coil 33...Rotor 33a...Permanent magnet 34...Rotor (permanent magnet) 35...Stator 35a, 35b, 35c...Electromagnetic coils 36...Rotation axis R...Rotation direction M...Leakage magnetic flux MF...Magnetic 10, 10A, 10B...Leakage magnetic flux power generation device (power generation device) 11...Winding unit 11A...Coil bobbin 11a...torso 11b...shaft hole 11c...Flange 11B...winding 11C…Internal space 12...Core 12a...One end (mounting part) 12b...other end 13...Core 13A…Horizontal part 13B…Vertical part 13a…one end 13b...other end 14,15...Core

Claims

1. A leakage magnetic flux power generation device that is attached to a power machine having a moving body that performs rotational or linear motion by electromagnetic force, one or more windings that generate electromotive force by electromagnetic induction due to a change in leakage magnetic flux leaking from the power device in accordance with the rotational or linear motion of the moving body; The rotor further includes a core made of a soft magnetic material, at least a portion of which is inserted into the internal space of the winding, A leakage magnetic flux power generating device, wherein the core is made of a rod-shaped member, and one end of the core is an attachment portion that is attached to the outer surface of a housing of the power equipment.

2. A leakage magnetic flux power generating device attached to a power device having a moving body that performs rotational or linear motion by electromagnetic force, one or more windings that generate electromotive force by electromagnetic induction due to a change in leakage magnetic flux leaking from the power device in accordance with the rotational or linear motion of the moving body; The rotor further includes a core made of a soft magnetic material, at least a portion of which is inserted into the internal space of the winding, A leakage magnetic flux power generating apparatus, wherein the core is a U-shaped member when viewed from the front, and both ends of the core are attached to the outer surface of a housing of the power equipment.

3. A leakage magnetic flux power generating device attached to a power device having a moving body that performs rotational or linear motion by electromagnetic force, a winding that generates electromotive force by electromagnetic induction due to a change in leakage magnetic flux leaking from the power device in accordance with the rotational or linear motion of the moving body; The rotor further includes a core made of a soft magnetic material, at least a portion of which is inserted into the internal space of the winding, A leakage flux power generating device characterized in that a plurality of the windings are provided, and at least a portion of the core is inserted so as to span the internal space of each of the plurality of windings, thereby arranging the plurality of windings in series.

4. The leakage magnetic flux power generating device according to any one of claims 1 to 3, characterized in that the winding generates electromotive force through electromagnetic induction due to changes in leakage magnetic flux leaking from one or both of an electromagnetic coil and a permanent magnet that are provided in the power equipment and that cause the moving body to rotate or linearly move.

5. The leakage magnetic flux power generating device according to claim 2, characterized in that the two ends of the core are attached to the outer surface of the housing of the power equipment at positions where the timing of change of the leakage magnetic flux differs.

6. The plurality of windings have the same or different impedances, 4. The leakage magnetic flux power generating device according to claim 3, wherein the currents generated in the plurality of windings are output individually for each winding, or are output collectively by electrically connecting at least some of the plurality of windings in series or in parallel.

7. the power device is a rotary motor having a rotor as the moving body, 4. The leakage flux power generating device according to claim 1, wherein the winding is arranged so that the winding axis of the winding is perpendicular to the direction of rotation of the rotor.

8. the power device is a linear motor having a slide moving element as the moving body, 4. The leakage magnetic flux power generating device according to claim 1, wherein the winding is arranged so that the winding axis of the winding is perpendicular to the direction of movement caused by the linear movement of the slide mover.

9. A power device comprising a moving body that performs rotational or linear motion by electromagnetic force, and one or more leakage flux power generating devices according to any one of claims 1 to 3 attached to the outer surface of a housing in which the moving body is arranged.

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