Non-rotating DC current generator

Abstract

The present invention relates to a non-rotating DC generator capable of generating DC with high efficiency without rotating a field magnet or an armature. The non-rotating DC generator of the present invention is a DC generator that generates DC current and includes a drive unit and a generator unit, the generator unit including a rod-shaped core member; a field magnet around which an electric line is wound and which has a first hollow portion formed in its central part and which is disposed outside the core member through the first hollow portion; and an armature around which an electric line is wound and which has a second hollow portion formed in its central part and which is disposed outside the core member through the first hollow portion, pole pieces are provided between the field magnet and the armature, and insulating plates are provided between the field magnet and the pole pieces and between the armature and the pole pieces, and the drive unit supplies a field current to the generator unit based on AC current from an AC power source.

Description

[Technical Field]

[0001] The present invention Non-rotating DC current generator This is related to the fact that it has become possible to generate DC with high efficiency without rotating the field or armature. Non-rotating DC current generator It is related to. [Background technology]

[0002] An electric generator is a device that converts mechanical energy into electrical energy. It can be classified as a DC generator, synchronous generator, or induction generator depending on its operating method and principle. A generator typically includes an armature that generates and outputs current and a field magnet that generates a magnetic field. A generator typically generates a magnetic field by supplying DC power to the field magnet, and then rotating the armature relative to the field magnet or rotating the field magnet relative to the armature to generate current in the armature. The method of rotating the armature is called a rotating armature type, and the method of rotating the field magnet is called a rotating field type. In such rotary generators, the armature and field magnet are driven by separate energy sources. While appropriate energy sources are selected depending on the application, they typically use natural energy sources such as hydropower, wind power, and tidal power, or drive means such as turbines, engines, and motors.

[0003] Generally, direct current (DC) has the advantage of being easily stored, but the disadvantage of being difficult to boost and increase in power. In contrast, alternating current (AC) has the advantage of being very poorly storable, but easily boosted and increased in power. One preferred application of a generator is a system configured to generate various AC power sources by rotating a field magnet or an armature using a stored DC power source, such as a battery, or another AC power source. Such power systems or power conversion systems are often used as emergency power supplies in industrial facilities requiring high power, such as hospitals and factories. Furthermore, such power systems can be very useful in electric vehicles, which use electricity as an energy source and are required to generate various drive torques depending on the situation.

[0004] Another application of generators is a system that generates DC power by generating an induced current through the rotation of a field or armature and outputting it through a commutator or commutator bars. Such power systems or power conversion systems are widely used in power supply systems for devices that use DC power sources, such as automobiles and aircraft, and in battery charging systems for charging batteries used in such devices and equipment.

[0005] Conventional generators basically require the rotation of an armature or a field magnet. These structural features inevitably lead to structural and mechanical complexity of the generator, as well as increased manufacturing costs. In particular, the aforementioned structural features result in a large amount of energy loss due to mechanical friction when the armature or field magnet rotates. This limits the generator's ability to improve its power generation efficiency and power conversion efficiency. Furthermore, DC generators require a commutator or commutator bars to rectify the induced current. As a result, DC generators have the disadvantage of being inferior to AC generators in terms of structure and weight.

[0006] Patent Document 1 (Korean Patent Registration No. 10-1913746, Title: AC Power Generator with Adjustable Frequency and Voltage), Patent Document 2 (Korean Patent Publication No. 10-2014-0078732, Title: Power Conversion Device), and Patent Document 3 (Japanese Patent Application Laid-Open No. 2000-353627, Title: Isolated Converter Transformer and Switching Power Supply Circuit) introduce devices and systems that perform power conversion without rotating the armature or field. Patent Document 1 is particularly noteworthy. This patent describes a system in which armatures and field magnets are alternately stacked and the pulse width of the DC power supplied to the field magnet is duty-controlled, making it possible to easily adjust the frequency and power of the AC power obtained from the armature. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Patent Registration No. 10-1913746 [Patent Document 2] Korean Patent Publication No. 10-2014-0078732 [Patent Document 3] Japanese Patent Application Publication No. 2000-353627 Summary of the Invention [Problem to be solved by the invention]

[0008] A main technical object of the present invention is to provide a non-rotating DC generator that does not rotate an armature or a field magnet and that can generate DC power without employing a commutator. Another technical object of the present invention is to provide a non-rotating DC generator that can generate DC power with high efficiency. Another technical object of the present invention is to provide a highly efficient AC-DC power converter. A further technical object of the present invention is to provide a non-rotating DC generator that can be used as a DC power converter. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, a non-rotating DC generator according to the present invention is a DC generator for generating DC current, comprising a drive unit and a generator unit, the generator unit comprising: a rod-shaped core member; a field magnet around which an electric line is wound and which has a first hollow portion formed in its central part and which is disposed outside the core member through the first hollow portion; and an armature around which an electric line is wound and which has a second hollow portion formed in its central part and which is disposed outside the core member through the first hollow portion, pole pieces are provided between the field magnet and the armature, and insulating plates are provided between the field magnet and the pole pieces and between the armature and the pole pieces, and the drive unit supplies a field current to the generator unit based on AC current from an AC power source.

[0010] Furthermore, to achieve the above object, a non-rotating DC generator according to the present invention is a DC generator for generating DC current, comprising: a rod-shaped core member; a field magnet around which an electric line is wound and which has a first hollow portion formed in its central portion and which is disposed outside the core member through the first hollow portion; and an armature around which an electric line is wound and which has a second hollow portion formed in its central portion and which is disposed outside the core member through the first hollow portion, wherein pole pieces are provided between the field magnet and the armature, and insulating plates are provided between the field magnet and the pole pieces and between the armature and the pole pieces, and wherein the field magnet is driven by a DC field current, which has a constant frequency. [Effects of the Invention]

[0011] According to the present invention having the above configuration, the field magnet and armature are stacked on the core member, and a desired DC current is generated from the armature by appropriately supplying a field current to the field magnet. Therefore, the present invention does not require a mechanical structure for rotating the field magnet or armature, and the commutator can be eliminated, greatly simplifying the structure of the DC generator and reducing its weight.

[0012] In addition, since the DC generator of the present invention is non-rotating, energy loss due to friction occurring during the rotation of the field or armature is minimized, thereby significantly improving the power generation efficiency of the generator.

[0013] The drawings attached to this specification are for the purpose of efficiently explaining the technical configuration of the present invention, and it should be understood that some components in the drawings may be simplified or exaggerated in order to efficiently understand the present invention. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing the configuration of a generator unit 100 or a DC generator according to a first embodiment of the present invention. [Figure 2] 2 is a block diagram showing the configuration of a non-rotary DC generator employing the generator unit 100 of FIG. 1. FIG. [Figure 3] FIG. 10 is a block diagram showing the configuration of a non-rotary DC generator according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a block diagram showing the configuration of a non-rotary DC generator according to a third embodiment of the present invention. [Figure 5] FIG. 10 is a block diagram showing the configuration of a non-rotary DC generator according to a fourth embodiment of the present invention. [Figure 6] FIG. 10 is a front view schematically showing the external shape of a generator unit 100C or a DC generator according to a fifth embodiment of the present invention. [Figure 7] FIG. 7 is an exploded perspective view of the generator unit 100C or DC generator shown in FIG. 6. [Figure 8] 1 is a graph showing the characteristics of demagnetization time depending on the cooling time of pure iron. [Figure 9] 10 is a graph showing a cooling characteristic curve over time when a core member 40 and a pole piece 80 are heat treated in the present invention. [Figure 10] FIG. 10 is a front view schematically showing the external shape of a generator unit 100D or a DC generator according to a sixth embodiment of the present invention. [Figure 11]2 is a waveform diagram showing an example of a field current supplied to an input terminal 12 of a field 10 in FIG. [Figure 12] FIG. 10 is a perspective view showing the configuration of a DC generator according to a seventh embodiment of the present invention. [Figure 13] 13 is a waveform diagram showing an example of field currents supplied through input terminals 12-1 and 12-2 of first and second field magnets 10-1 and 10-2 when selectively driving first and second field magnets 10-1 and 10-2 in FIG. 12. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] To achieve the above object, the present invention provides a non-rotating DC generator that generates DC current, comprising a drive unit and a generator unit, the generator unit comprising: a rod-shaped core member; a field magnet around which an electric line is wound and which has a first hollow portion formed in its central part and which is disposed outside the core member through the first hollow portion; and an armature around which an electric line is wound and which has a second hollow portion formed in its central part and which is disposed outside the core member through the first hollow portion, pole pieces are provided between the field magnet and the armature, and insulating plates are provided between the field magnet and the pole pieces and between the armature and the pole pieces, and the drive unit supplies a field current to the generator unit based on AC current from an AC power source.

[0016] Furthermore, to achieve the above object, a non-rotating DC generator according to the present invention is a DC generator for generating DC current, comprising: a rod-shaped core member; a field magnet around which an electric line is wound and which has a first hollow portion formed in its central portion and which is disposed outside the core member through the first hollow portion; and an armature around which an electric line is wound and which has a second hollow portion formed in its central portion and which is disposed outside the core member through the first hollow portion, wherein pole pieces are provided between the field magnet and the armature, and insulating plates are provided between the field magnet and the pole pieces and between the armature and the pole pieces, and wherein the field magnet is driven by a DC field current, which has a constant frequency. The core member may have a hollow space in the center along the longitudinal direction. The present invention is also characterized in that an insulating material is further disposed between the core member and the first or second hollow portion. The insulating plate is preferably made of a highly elastic material. The insulating plate is also characterized by being made of PET. The core member is made of pure iron and is heat treated. The pole pieces are made of pure iron and are heat treated.

[0017] The heat treatment is characterized in that the core member or the pole piece is placed in a furnace together with solid fuel, the solid fuel is burned to heat the core member or the pole piece to a certain temperature or higher, and the core member or the pole piece is allowed to cool naturally together with the burned solid fuel. The solid fuel is white charcoal. The core member or the pole piece is also characterized by being surface-treated with oil. The present invention is also characterized in that a plurality of field magnets and armatures are provided, and the field magnets and armatures are arranged alternately. The plurality of armatures are connected in series with one another. The plurality of field magnets are divided into a first field magnet group and a second field magnet group, and the first field magnet group and the second field magnet group are driven alternately. The plurality of field magnets are divided into a first field magnet group and a second field magnet group, and the first field magnet group and the second field magnet group are driven in synchronization with each other. The first and second field groups are each connected in series to a field current input. Furthermore, the first and second field groups are each connected in parallel to a field current input. MODE FOR CARRYING OUT THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are illustrative of preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. It should be readily understood by those skilled in the art that the present invention can be embodied in various modifications without departing from the technical spirit thereof.

[0019] First, the basic concept of the present invention will be explained. As mentioned above, the basic principle of a generator is to generate an induced current flow in the armature by varying the magnetic field (magnetic flux) applied to the armature. One method for varying the magnetic flux in the armature is to supply a DC power source to the magnetic field from an external source to generate a magnetic field (magnetic flux), and then vary the relative position between the magnetic field and the armature, i.e., by rotating the magnetic field or the armature, thereby varying the magnetic field (magnetic flux) applied to the armature. This method is currently adopted in most generators, but as mentioned above, rotating the magnetic field or the armature results in a complex generator structure and reduced power generation efficiency.

[0020] Another method for varying the magnetic flux in the armature is to vary the field current supplied to the field to vary the magnetic field (magnetic flux) itself generated by the field. This method, if an appropriate method for varying the field current is provided, can avoid the conventional problems of a complex generator structure and reduced efficiency due to the rotational drive of the armature and field. In this invention, this method is referred to as a non-rotating type, as a concept relative to the conventional rotating armature type or rotating field type, and a generator using this method is referred to as a non-rotating type generator.

[0021] FIG. 1 is a perspective view showing the configuration of a generator unit 100 or DC generator according to a first embodiment of the present invention. In the drawing, the generator unit 100 or DC generator includes a field 10 and an armature 20. The field 10 and the armature 20 are formed by winding conductive lines 11, 21, respectively, coated with an insulating material. Examples of suitable conductive lines include polyurethane copper wire, polyester copper wire, polyamide imide (PAI) copper wire, and polyester imide copper wire. The field 10 includes an input terminal 12 for supplying a field current, and the armature 20 includes an output terminal 22 for drawing an induced current, i.e., a current generated in the armature 20. The turns ratio of the field 10 and the armature 20 can be appropriately set depending on the field power and output power.

[0022] The field magnet 10 and the armature 20 are generally formed in a cylindrical shape with hollow portions 13, 23 in the center. The shapes of the field magnet 10 and the armature 20 are not limited to a specific one. For example, the field magnet 10 and the armature 20 may be configured in an elliptical or polygonal shape. The field magnet 10 and the armature 20 are arranged vertically or horizontally so that the hollow portions 13, 23 are aligned with each other. Preferably, the field magnet 10 and the armature 20 are arranged as close as possible to each other without causing leakage current or sparks. The arrangement positions of the field magnet 10 and the armature 20 are not limited. For example, when the field magnet 10 and the armature 20 are arranged vertically, the field magnet 10 may be arranged above or below the armature 20. When the field magnet 10 and the armature 20 are arranged horizontally, the field magnet 10 may be arranged on the left or right side of the armature 20. The field magnet 10 is appropriately arranged on one side of the armature 20.

[0023] Alternatively, a field current is supplied to the field 10 through an input terminal 12. Although not specifically shown in the drawings, a current source such as a battery is connected to the input terminal 12 to supply the field current, and appropriate means for controlling the output of the generator by controlling the duty ratio of the field current supplied through the input terminal 12 may be connected between the current source and the input terminal 12. Such means may include a PWM (Pulse Width Modulation) control means and a switching means such as an IGBT (Insulated Gate Bipolar Transistor). Supply and control of the field current through the switching means and PWM control means are described in Patent Document 1.

[0024] 2 is a block diagram showing the configuration of a DC generator including the generator unit 100. In the drawing, the DC generator includes, in addition to the generator unit 100 described above, a drive unit 200 for appropriately driving the generator unit 100. In the drawing, the drive unit 200 includes an AC power supply 210 for supplying a field current, a rectifier unit 220 that performs half-wave or full-wave rectification on the AC current supplied from the AC power supply 210, and a PWM (Pulse Width Modulation) control unit 230 that controls the pulse width, i.e., duty ratio, of the field current supplied to the generator unit 100 to control the DC power output from the generator unit 100.

[0025] In the above-described configuration, the drive unit 200 rectifies AC current from the AC power source 210 and supplies it to the generator unit 100. The output current of the drive unit 200 is supplied to the input terminal 12 of the generator unit 100. The field current supplied to the input terminal 12 of the generator unit 100 flows through the line 11 of the field 10 in FIG. 1. As a result, a magnetic field is formed in a direction perpendicular to the direction of travel of the line, corresponding to the winding direction of the line 11. The direction in which the magnetic field is formed can be defined by Ampere's right hand screw rules.

[0026] The magnetic field generated by the field 10 is perpendicularly interlinked with the line 21 of the armature 20. A current flows in a fixed direction in the line 21 of the armature 20, corresponding to the direction of the magnetic field and the winding direction of the line 21. At this time, the magnitude of the induced current corresponds to the strength of the magnetic field and its variation. The induced current flowing through the line 21 is output to the outside through the output terminal 22 as the generated current of the generator unit 100.

[0027] In the above configuration, the field 10 and the armature 20 are fixedly disposed adjacent to each other, and the drive unit 200 rectifies AC current and supplies it to the generator unit 100 as a field current, thereby outputting DC current through the generator unit 100. In addition, the duty ratio of the field current supplied from the drive unit 200 to the generator unit 100 can be controlled to appropriately adjust the output power of the generator unit 100.

[0028] FIG. 3 is a block diagram showing the configuration of a non-rotary DC generator according to a second embodiment of the present invention. In FIG. 3, parts that are substantially the same as those in the previously described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, a generator unit 100A includes a plurality of field magnets 10-1 and 10-2, two in this example, for one armature 20. The first and second field magnets 10-1 and 10-2 have substantially the same configuration. The first and second field magnets 10-1 and 10-2 are appropriately positioned relative to the armature 20. In one preferred embodiment of the present invention, the first and second field magnets 10-1 and 10-2 are positioned adjacent to each other on both sides of the armature 20. In other embodiments, the field magnets 10-1 and 10-2 may be positioned on one or the other side of the armature 20.

[0029] In this embodiment, one input terminal of the first field magnet 10-1 is electrically connected to the field current input side from the drive unit 200, and the other input terminal is electrically connected to one input terminal of the second field magnet 10-2 through a connecting wire 101, and the other input terminal of the second field magnet 10-2 is grounded. That is, the first and second field magnets 10-1 and 10-2 are connected or coupled in series to the field input from the drive unit 200. In another embodiment of the present invention, the first and second field magnets 10-1 and 10-2 may be coupled in parallel to the field current input from the drive unit 200.

[0030] In this embodiment, multiple field magnets 10-1, 10-2 are provided for one armature 20, so that an electric field can be applied to the armature 20 more efficiently, thereby further increasing the efficiency of the DC generator.

[0031] FIG. 4 is a block diagram showing the configuration of a non-rotary DC generator according to a third embodiment of the present invention. In FIG. 4, parts that are substantially the same as those in the previously described embodiments are given the same reference numerals, and detailed description thereof will be omitted. In this embodiment, a generator unit 100B includes a plurality of armatures 20-1, 20-2 for one field 10. Here, the first and second armatures 20-1, 20-2 have substantially the same configuration. Furthermore, the first and second armatures 20-1, 20-2 are appropriately arranged on one or the other side of the field 10, but preferably the first and second armatures 20-1, 20-2 are arranged adjacent to both sides of the field 10, respectively.

[0032] The output terminals 22 of the first and second armatures 20-1 and 20-2 may be coupled in series or in parallel. In the embodiment of Fig. 3, the other output terminal of the first armature 20-1 is electrically coupled to one output terminal of the second armature 20-2 through a connecting wire 201, and the first and second armatures 20-1 and 20-2 are coupled in series to their output terminals 22 as a whole. In this embodiment, a plurality of armatures 20-1 and 20-2 are provided for one field 10, thereby enabling more efficient use of the electric field generated by the field 10.

[0033] 5 is a block diagram showing the configuration of a non-rotary DC generator according to a fourth embodiment, which shows another example of the configuration of a drive unit 200A that drives a generator unit 100A. In this figure, parts that are essentially the same as those in the above-described embodiments are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0034] In this embodiment, the drive unit 200A does not include the rectifier 220 of the configuration shown in FIG. 2. The drive unit 200A also includes a switching unit 250 that selectively supplies AC current applied from an AC power supply 210 to the first field 10-1 and the second field 10-2 of the generator unit 100A. The switching unit 250 is controlled by a detection signal from the zero crossing point detector 240. The AC current output from the AC power supply 210 alternates between a first current flowing in a first direction and a second current flowing in a second direction opposite to the first direction. The zero crossing point detector 240 detects a zero crossing point, which is the moment when the first AC current and the second AC current alternate, and outputs a detection signal. Based on the detection signal, the switching unit 250 selectively supplies AC current applied from the AC power supply 210 to the input terminal 12-1 of the first field 10-1 or the input terminal 12-2 of the second field 10-2. The first field magnet 10-1 receives the output current of the switching unit 250 at one input terminal 12-1, and the second field magnet 10-2 receives the output current of the switching unit 250 at the other input terminal 12-2. As a result, the field current flowing through the first field magnet 10-1 and the field current flowing through the second field magnet 10-2 are set to have the same direction. As a result, magnetic fields are linked in the same direction in the line 21 of the armature 20 when the first field magnet 20-1 and the second field magnet 20-2 are driven, and an induced current is always output from the output terminal 22 of the armature 20 in the same direction.

[0035] FIG. 6 is a front view schematically illustrating the external shape of a generator unit 100C or DC generator according to a fifth embodiment of the present invention, and FIG. 7 is an exploded perspective view thereof. In FIG. 6, the generator unit 100C or DC generator includes a base member 30 and a rod-shaped core member 40 coupled to the center of the base member 30. The outer circumferential surface of the core member 40 is shaped to correspond to the hollow portions 13 and 23 of the field magnets 10-1 and 10-2 and the armatures 20-1, 20-2, and 20-3, respectively, so that the core member 40, the field magnets 10-1 and 10-2, and the armatures 20-1, 20-2, and 20-3 are positioned as close as possible to each other. The core member 40 preferably includes a hollow 41 extending in the longitudinal direction. The hollow 41 allows air to flow smoothly through the core member 40, thereby preventing inappropriate accumulation of thermal energy within the core member 40.

[0036] Field magnets 10-1 and 10-2 and armatures 20-1, 20-2, and 20-3 are alternately inserted and stacked or coupled along the outer circumferential surface of core member 40. In this embodiment, the first armature 20-1 is arranged in the space between the first and second field magnets 10-1 and 10-2 in the same manner as in the embodiment of Figures 3 and 4, and the first field magnet 10-1 and the second field magnet 10-2 are arranged between the first armature 20-1 and the second armature 20-2 and between the first armature 20-1 and the third armature 20-3, respectively.

[0037] The first to third armatures 20-1 to 20-3 have substantially the same configuration and are connected in series to function as a single armature. That is, the first to third armatures 20-1 to 20-3 all have the wires 11 wound in the same direction, and one output end of the first armature 20-1 is electrically connected to the other output end of the second armature 20-2 via a connecting wire 201, and the other output end of the first armature 20-1 is electrically connected to one output end of the third armature 20-3 via a connecting wire 202. More specifically, the first to third armatures 20-1 to 20-3 are all configured and connected so that an induced current flows in the same direction when an electric field is oriented in the same direction. One output end 22a of the second armature 20-2 and the other output end 22b of the third armature 20-3 form the output ends of an AC generator.

[0038] In contrast, the input terminals 12-1, 12-2 of the first field 10-1 and the second field 10-2 are coupled to the drive units 200, 200A in a manner similar to the embodiment of FIGS.

[0039] In a preferred embodiment of the present invention, the inner circumferential surfaces of the field magnets 10-1, 10-2 and armatures 20-1 to 20-3 are respectively coated with insulating materials 130, 230. These insulating materials 130, 230 are employed to achieve more reliable insulation between the field magnets 10-1, 10-2 and armatures 20-1 to 20-3 and the core member 40 inserted through their hollow portions 13, 23.

[0040] Pole pieces 80 are provided between the field magnets 10-1, 10-2 and the armatures 20-1 to 20-3, respectively. Preferably, pole pieces 80 are also provided on the uppermost and lowermost armatures or field magnets, i.e., in this embodiment, above the second armature 20-2 and below the third armature 20-3. Insulating plates 90 are provided between the pole pieces 80 and the field magnets 10-1, 10-2 and between the pole pieces 80 and the armatures 20-1 to 20-3, respectively. The cross-sectional shape and size of the pole pieces 80 are set to be the same as those of the field magnets 10-1, 10-2 and the armatures 20-1 to 20-3. Although not specifically shown in the drawings, the cross-sectional shape and size of the insulating plate 90 are set to be larger than those of the field magnets 10-1, 10-2 and the armatures 20-1 to 20-3 to ensure stable insulation.

[0041] The material of insulating plate 90 is not limited to a specific one. In order to allow the magnetic field generated by field magnets 10-1 and 10-2 to act most effectively on armatures 20-1 to 20-3, it is necessary to minimize the distance between field magnets 10-1 and 10-2 and armatures 20-1 to 20-3, or preferably to bring them into close contact. Insulating plate 90 prevents leakage current or sparks from occurring between field magnets 10-1 and 10-2 or armatures 20-1 to 20-3 and pole pieces 80, or between field magnets 10-1 and 10-2 and armatures 20-1 to 20-3, and ensures that field magnets 10-1 and 10-2 and armatures 20-1 to 20-3 are as close as possible to each other.

[0042] In a preferred embodiment of the present invention, the insulating plate 90 is made of a material with a high elastic modulus and excellent impact resistance, such as PET (Polyethylene terephthalate). As described below, the core member 40 and the pole pieces 80 provide a magnetic path for the magnetic field generated by the fields 10-1 and 10-2, allowing the magnetic field generated by the fields 10-1 and 10-2 to circulate while interlinking the armatures 20-1 to 20-3 as a whole. The first field magnet 10-1 and the second field magnet 10-2 are not continuously driven, and their driving time is duty-controlled by the PWM control unit 230 of the driving units 200 and 200A. Alternatively, the first field magnet 10-1 and the second field magnet 10-2 are not continuously driven, but are driven or de-driven depending on the input of a field current. Therefore, the core member 40 and the pole pieces 80 are repeatedly magnetized and demagnetized in response to the driving of the first field magnet 10-1 and the second field magnet 10-2. Such magnetization and demagnetization may impact the core member 40, particularly the pole pieces 80, causing slight vibrations and oscillations in the pole pieces 80. When vibrations occur in the core member 40 and the pole pieces 80, a momentary deformation or distortion occurs in the magnetic path circulating therethrough, causing changes in the magnetic field interlinked with the armatures 20-1 to 20-3. This may result in undesired changes in the induced currents generated in the armatures 20-1 to 20-3. The insulating plate 90 has high elasticity and offsets or minimizes the vibrations and oscillations of the pole pieces 80, preventing unnecessary distortion of the AC current flow generated through the armatures 20-1 to 20-3.

[0043] As described above, the core member 40 and the pole pieces 80 are provided to ensure the smooth flow of the magnetic field generated by the fields 10-1 and 10-2. Ferromagnetic materials, preferably silicon steel, with high permeability and low coercivity, can be used for the core member 40 and / or the pole pieces 80. However, silicon steel has relatively low electrical conductivity, and its internal resistance easily increases due to external light or heat. When a magnetic path is formed through the core member 40 and the pole pieces 80, current may flow in response to fluctuations in the magnetic field. This generates heat inversely proportional to the electrical conductivity of the core member 40 and the pole pieces 80. This results in the problem of magnetic energy generated by the fields 10-1 and 10-2 being lost as thermal energy.

[0044] In another preferred embodiment of the present invention, the core member 40 and / or pole pieces 80 are made of pure iron, more preferably heat-treated pure iron. Pure iron has high magnetic permeability and excellent electrical conductivity, while also having a relatively high coercive force. Because magnetic fields are applied to the core member 40 and pole pieces 80 alternately or in various ways from the first field magnet 10-1 and the second field magnet 10-2, or because the first and second magnetic fields generated by the first field magnet 10-1 and the second field magnet 10-2 are applied alternately, the materials used must have as fast a demagnetization time as possible, i.e., low coercive force. According to the inventor's research, when pure iron is heated above a certain temperature and then gradually cooled, the demagnetization time is shortened in accordance with the cooling time. Figure 8 is a graph showing the demagnetization time vs. cooling time characteristics of pure iron. As a result of the research, it was confirmed that if the temperature of pure iron heated above a certain temperature is gradually cooled over a sufficient period of time of 10 hours or more, the demagnetization time can be shortened to 1 / 450 (seconds) or less. In addition, if the cooling time of pure iron is delayed, an additional effect of further improving the magnetic permeability and electrical conductivity can be obtained.

[0045] In the present invention, the core member 40 and the pole pieces 80 are first manufactured using pure iron and then heat-treated. The heat treatment is performed using solid fuel, such as black charcoal or white charcoal, preferably white charcoal. Specifically, during the heat treatment, the core member 40 and the pole pieces 80 are placed in a kiln together with the white charcoal, and the white charcoal is burned to heat the core member 40 and the pole pieces 80 to 1000-1300°C or higher. The core member 40 and the pole pieces 80 are then left at room temperature, allowing the white charcoal to naturally burn and extinguish. The core member 40 and the pole pieces 80 then naturally cool along with the white charcoal. As the white charcoal burns and extinguishes, the temperatures of the core member 40 and the pole pieces 80 gradually decrease. It then takes a considerable amount of time for the core member 40 and the pole pieces 80 to cool to room temperature due to the latent heat of the white charcoal. Figure 9 is a graph showing the cooling characteristic curves over time for the core member 40 and the pole pieces 80 heat-treated using the above method. After the heat treatment is completed, impurities such as white carbon are removed from the core member 40 and the pole piece 80, and finally, an anti-rust treatment is performed using oil or the like.

[0046] 6 and 7, when assembling the AC generator, first, core member 40 is fastened to base member 30. Next, magnetic pole pieces 80 and insulating plates 90 are inserted onto the outside of core member 40, and armatures 20-1 to 20-3 and field magnets 10-1, 10-2 are alternately stacked in order. After that, cover 60 and fastening member 70 are joined. Finally, connecting wires 201, 202 are used to connect first and second field magnets 10-1, 10-2 to first to third armatures 20-1 to 20-3, and then connecting generator unit 100 to drive unit 200, thereby completing the DC generator.

[0047] 10 is a front view showing a schematic external shape of a generator unit 100D or a DC generator according to a sixth embodiment of the present invention. In this embodiment, a core member 40 is fastened to a base member 30, and a plurality of field magnets 10-1 to 10-n and a plurality of armatures 20-0 to 20-n are alternately stacked and coupled to the core member 40 via insulating plates 90 and pole pieces 80. In this case, the armatures 20-0 to 20-n are configured and coupled so as to generate induced currents in the same direction in response to the same magnetic field, similar to FIG. 6.

[0048] In this embodiment, the field magnets 10-1 to 10-n are coupled to the drive units 200 and 200A in the same manner as in the embodiment of FIGS. 1 to 5. However, when the embodiment of FIG. 5 is applied to the generator unit 100D, n / 2 of the n field magnets constitute a first field magnet group, and the remaining n / 2 constitute a second field magnet group. Preferably, the odd-numbered field magnets 10-1, 10-3, ..., 10-(n-1) constitute the first field magnet group, and the even-numbered field magnets 10-2, 10-4, ..., 10-n constitute the second field magnet group. In this case, the configuration of each field magnet group can be achieved by appropriately setting the winding direction of the wires constituting each field magnet or by appropriately setting the connection method of the field current supplied to these field magnets. The first field magnet group and the second field magnet group are driven synchronously, and the first field magnet group and the second field magnet group are driven alternately, thereby forming a magnetic field in the same direction overall. The fields constituting the first and second field groups can be connected in various ways. The input terminals of the first and second field groups can be connected in series with each other, and the first and second field groups can each be connected in series with one field current input. Also, the first and second field groups can each be connected in parallel with one field current input.

[0049] This embodiment is provided with a plurality of field magnets 10-1 to 10-n and armatures 20-0 to 20-n, so that various DC powers can be generated as required. Note that other parts are substantially the same as those in the previously described embodiment, so the same reference numerals are used to designate the same parts as in the previously described embodiment, and detailed descriptions thereof will be omitted.

[0050] Fig. 11 is a waveform diagram showing an example of a field current supplied to the input terminal 12 of the field 10. In Fig. 11, possible methods for adjusting the output of the DC generator include adjusting the duty ratio of the basic field current shown in (a) as in (b), adjusting the frequency as in (c), or adjusting both the duty ratio and frequency as in (d).

[0051] When a field current is supplied to the input terminal 12 of the field magnet 10, the field current flows through the line 11 of the field magnet 10. This generates a magnetic field perpendicular to the direction of travel of the line, corresponding to the winding direction of the line 11. The direction in which the magnetic field is generated can be defined by Ampere's right hand screw rules. The magnetic field generated by the field magnet 10 interlinks perpendicularly with the line 21 of the armature 20. A current flows in a fixed direction in the line 21 of the armature 20, corresponding to the direction of the magnetic field and the winding direction of the line 21. At this time, the magnitude of the induced current corresponds to the strength of the magnetic field and its change amount. The induced current flowing through the line 21 is output to the outside through the output terminal 22 of the armature 20.

[0052] In the above-described configuration, the field 10 and the armature 20 are fixedly arranged adjacent to each other, and a desired DC power is output through the armature 20 by supplying an appropriate field current to the field 10.

[0053] Fig. 12 is a perspective view showing the configuration of a DC generator according to a seventh embodiment of the present invention. In Fig. 11, parts that are substantially the same as those in Fig. 1 are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0054] In this embodiment, a plurality of field magnets 10-1, 10-2 (two in this example) are provided for one armature 20. In this case, the first and second field magnets 10-1, 10-2 have substantially the same configuration. The first and second field magnets 10-1, 10-2 are appropriately arranged with respect to the armature 20. Preferably, the first and second field magnets 10-1, 10-2 are arranged adjacent to each other on both sides of the armature 20. In another embodiment, the field magnets 10-1, 10-2 may be arranged on one or the other side of the armature 20.

[0055] In this embodiment, the first and second field magnets 10-1 and 10-2 are connected in series or parallel to the field input. In another preferred embodiment, field currents can be selectively or alternately applied to the first and second field magnets 10-1 and 10-2 to drive the first and second field magnets 10-1 and 10-2 separately. FIG. 13 is a waveform diagram showing an example of field currents supplied through the input terminals 12-1 and 12-2 of the first and second field magnets 10-1 and 10-2 when selectively driving the first and second field magnets 10-1 and 10-2. In the diagram, A represents the field current input through the first input terminal 12-1, and B represents the field current input through the second input terminal 12-2. In this embodiment, the duty ratio and frequency of each field current A and B can be appropriately changed, as shown in FIG. 11b-c. In this example, the first field magnet 10-1 and the second field magnet 10-2 do not necessarily have to be driven alternately, and their driving periods may overlap. The driving method for the first field magnet 10-1 and the second field magnet 10-2 is not limited to a specific method.

[0056] Field magnets 10-1 and 10-2 and armatures 20-1, 20-2, and 20-3 are alternately inserted and stacked or joined along the outer circumferential surface of core member 40. In this embodiment, as in Fig. 12, a first armature 20-11 is arranged inside first and second field magnets 10-1 and 10-2, i.e., in the space between them, and in addition, a second armature 20-2 and a third armature 20-3 are arranged outside first and second field magnets 10-1 and 10-2, respectively.

[0057] The first to third armatures 20-1 to 20-3 have substantially the same configuration and are connected in series to function as a single armature. That is, the first to third armatures 20-1 to 20-3 all have the wires 11 wound in the same direction, and one output end of the first armature 20-1 is electrically connected to the other output end of the second armature 20-2 via a connecting wire 201, and the other output end of the first armature 20-1 is electrically connected to one output end of the third armature 20-3 via a connecting wire 202. More specifically, the first to third armatures 20-1 to 20-3 are all configured and connected so that an induced current flows in the same direction when an electric field is in the same direction. One output end 22a of the second armature 20-2 and the other output end 22b of the third armature 20-3 form the output ends of an AC generator. The field current is appropriately supplied to the input terminals 12-1 and 12-2 of the first field magnet 10-1 and the second field magnet 10-2 by the method described with reference to FIGS.

[0058] In this embodiment, the field magnets 10-1 to 10-n are coupled to the field current in the same manner as in FIGS. 11 and 13. However, when applying the example of FIG. 13, n / 2 of the n field magnets constitute the first field magnet group, and the remaining n / 2 constitute the second field magnet group. Preferably, the odd-numbered field magnets 10-1, 10-3, ..., 10-(n-1) constitute the first field magnet group, and the even-numbered field magnets 10-2, 10-4, ..., 10-n constitute the second field magnet group. In this case, the configuration of each field magnet group can be achieved by appropriately setting the winding direction of the wires constituting each field magnet or by appropriately setting the connection method of the field current supplied to these field magnets. The first field magnet group and the second field magnet group are driven synchronously, so that the first field magnet group and the second field magnet group form a magnetic field in the same direction overall. The fields constituting the first field magnet group and the second field magnet group can be connected in various ways. The input terminals of the first field group and the second field group are connected in series with each other, and the first field group and the second field group can be connected in series with one field current input, or the first field group and the second field group can be connected in parallel with one field current input.

[0059] The above describes an embodiment of the present invention. However, the present invention is not limited to the above embodiment and can be implemented in various modifications. For example, the configuration and coupling structure of the base member 30, cover 60, and fastening member 70 used to configure the AC generator in the above embodiment is merely an example of a configuration for configuring the generator, and the present invention is not limited to such a configuration and coupling structure. It should be readily understood by those skilled in the art that the present invention can provide its technical effects through the configuration and coupling structure of the core member 40 and the field magnet 10 and armature 20 connected thereto, and that the structure and configuration used for their installation are not essential.

[0060] The embodiment of Fig. 6 can also be applied to the embodiments of Fig. 1 to Fig. 5. That is, in the embodiments of Fig. 1 to Fig. 5, the field magnet 10 and the armature 20 are arranged while being inserted into the core member 40, and the pole piece 80 and the insulating plate 90 can be arranged between the field magnet 10 and the armature 20. [Industrial Applicability]

[0061] According to the present invention having the above-mentioned configuration, the field magnet and armature are stacked on the core member, and a desired DC current is generated from the armature by appropriately supplying a field current to the field magnet. Therefore, the present invention does not require a mechanical structure for rotating the field magnet or armature, and the commutator can be eliminated, which greatly simplifies the structure of the DC generator and reduces its weight.

[0062] In addition, since the DC generator of the present invention is non-rotating, energy loss due to friction generated during the rotation of the field or armature is minimized, thereby significantly improving the power generation efficiency of the generator.

Claims

[Claim 1] In a non-rotating DC current generator that generates DC current without rotating a field or armature, a rod-shaped core member; The electric line is wound and a first hollow portion is formed in the central portion, and a field magnet is disposed outside the core member through the first hollow portion; an armature around which an electric line is wound and a second hollow portion is formed in a central portion thereof, the armature being disposed outside the core member through the second hollow portion; a current source that supplies a field current to an input terminal of the field; and A means for controlling a generator output by controlling a duty ratio of a field current supplied via the current source is connected between the current source and the input terminal, the means including a PWM (Pulse Width Modulation) control means and an IGBT (Insulated Gate Bipolar Transistor) switching means, and a PWM-modulated DC signal is supplied from the PWM control means as the field current via the IGBT switching means, a pole piece is provided between the field magnet and the armature; an insulating plate is disposed between the field magnet and the pole piece, and between the armature and the pole piece; The insulating plate is made of PET (Polyethylene terephthalate), a material with a high elastic modulus and excellent impact resistance. The core member and the pole pieces provide a magnetic path for the magnetic field generated by the field magnet, and the magnetic field generated by the field magnet circulates while interlinking the armature as a whole. At this time, the core member and the pole pieces are alternately magnetized and demagnetized. The insulating plate has high elasticity and offsets and minimizes the deflection and vibration of the magnetic pole pieces. A plurality of the field magnets and armatures are provided, the field magnets and armatures are arranged alternately, the first and second field magnets have substantially the same configuration, and the first and second field magnets are arranged adjacent to each other on both sides of the armature. A non-rotating DC current generator characterized by:

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