JP3175706U - Coreless generator and micro hydro power generation system using the same - Google Patents

Abstract

A coreless generator capable of obtaining high power generation efficiency and a micro hydroelectric power generation system using the same are provided.
A generator includes a rotor and a stator coil in a housing. A plurality of coreless spiral coils 13B are attached to the stator coil 13 in the circumferential direction of the stator disk 13A. The spiral coil 13B has a shape close to an elliptical shape that is wound by extending in the radial direction of the rotary shaft 14, and is disposed so that the spiral surface faces the magnetic pole of the permanent magnet 12B. The power generation system includes a water turbine, and mechanical energy of the water turbine is converted into electrical energy by the generator 10.
[Selection] Figure 1

Description

  The present invention relates to a coreless generator capable of generating power using small energy and a micro hydroelectric power generation system using the same.

  Power generation using light winds or small hydropower is not practical because stable power generation is difficult and power generation is small. However, due to the accident at TEPCO's Fukushima Daiichi NPS, it seems that even less power will be needed in the future. Therefore, development of an inexpensive generator that can efficiently generate power with small energy is desired.

  An example of a generator that can generate power even when the driving torque is weak is a coreless generator that uses an air-core coil (see, for example, Patent Document 1). Since the coreless generator has no cogging torque, it can generate power even when the driving torque is weak, and is suitable for power generation using light winds or small hydropower. However, since the output is small, it was necessary to improve the power generation efficiency for practical use.

JP 2005-160197 A

  The present invention has been made based on such a problem, and an object thereof is to provide a coreless generator capable of obtaining high power generation efficiency and a micro hydroelectric power generation system using the same.

  The coreless generator according to the present invention has a rotor disk fixed to a rotating shaft, a rotor provided with a plurality of permanent magnets so that different polarities appear alternately in the circumferential direction, and a stator disk fixed to a housing. And a stator coil provided with a plurality of coreless spiral coils in the circumferential direction so that the spiral surface faces the magnetic pole of the permanent magnet, and the spiral coil extends in the radial direction around the rotation axis. The end of the spiral coil that is wound is positioned on the side of the rotating shaft with respect to the rotating track of the permanent magnet, and the end of the spiral coil opposite to the end in the radial direction Is located on the outer peripheral side of the rotating track of the permanent magnet, and the start and end of winding of the spiral coil are positioned on the outer peripheral side of the rotating track of the permanent magnet.

  A micro hydroelectric power generation system according to the present invention includes a water turbine, a coreless generator according to claim 1 that converts mechanical energy of the water turbine into electrical energy, and a rectifier that rectifies AC power generated by the coreless generator; And a storage battery that stores DC power rectified by the rectifier, and an inverter that converts the DC power output from the storage battery into AC power of AC 100V.

  According to the coreless generator of the present invention, the spiral coil is wound by extending in the radial direction around the rotation axis, and the radial rotation shaft side end portion on the inner periphery of the spiral coil is rotated by the permanent magnet. Since the end opposite to the radial direction in the inner circumference of the spiral coil is located closer to the outer circumference than the rotary orbit of the permanent magnet, it is located closer to the rotation axis than the orbit. The interval can be reduced by the thickness of the spiral coil, and the power generation efficiency can be improved. Moreover, since the crossing angle between the rotating track of the permanent magnet and the spiral coil is close to a right angle, the power generation efficiency can be further improved. Furthermore, since the winding start and winding end of the spiral coil are positioned on the outer peripheral side of the rotating track of the permanent magnet, the end processing of the spiral coil can be facilitated. Therefore, the power generation efficiency can be improved with a simple structure, and power can be generated even when the driving torque is small.

  According to the micro hydroelectric power generation system of the present invention, since the coreless generator of the present invention is used, power can be generated even when the driving torque is small, and the AC power generated by the coreless generator is rectified, Since it is stored and converted to AC 100V for use in ordinary households by an inverter, it can be converted to a voltage that can be used in ordinary households even if the generated voltage is small, and both frequency and voltage are stable. Can be obtained.

It is sectional drawing showing the structure of the coreless generator which concerns on one embodiment of this invention. It is a figure which shows the positional relationship of the permanent magnet and spiral coil of a coreless generator shown in FIG. It is a figure showing the structure of the micro hydroelectric power generation system which concerns on one embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a cross-sectional configuration of a coreless generator 10 according to an embodiment of the present invention. The coreless generator 10 converts mechanical energy into electrical energy. For example, the coreless generator 10 includes a rotor 12 and a stator coil 13 in a housing 11. For example, a rotating shaft 14 is rotatably supported on the housing 11, and the rotating shaft 14 can be rotated by external power.

  The rotor 12 includes, for example, a pair of disk-shaped rotor disks 12A that are fixed to the rotating shaft 14 at an interval in the axial direction. For example, a plurality of permanent magnets 12B each made of a neodymium magnet or the like are fitted and fixed to the pair of rotor disks 12A. For example, the permanent magnets 12B are arranged at equal intervals in the circumferential direction, that is, on the same circular locus centering on the axis of the rotary shaft 14 in each rotor disk 12A. The magnetism on the opposing surfaces of a pair of opposing permanent magnets 12B is different, such as N pole and S pole or S pole and N pole. In addition, the polarities of the plurality of permanent magnets 12B having different phases on the same circular locus in the same rotor disk 12A are inverted one by one or every plurality.

  The stator coil 13 includes, for example, a stator disk 13A that is fixed to the housing 11 and disposed between the pair of rotor disks 12A. For example, a plurality of coreless spiral coils 13 </ b> B are attached to the stator disk 13 </ b> A in the circumferential direction, that is, on the same circular locus centered on the axis of the rotating shaft 14. Each spiral coil 13B is formed of, for example, a flat coil, and is disposed such that the spiral surface faces the magnetic pole of the permanent magnet 12B.

  FIG. 2 is a diagram illustrating the positional relationship between the permanent magnet 12B and the spiral coil 13B. Each spiral coil 13 </ b> B has, for example, a shape close to an elliptical shape that is wound by extending in the radial direction around the axis of the rotating shaft 14. An end portion 13C in the radial direction on the inner circumference of the spiral coil 13B is positioned on the side of the rotation shaft 14 with respect to the rotation track 12C of the permanent magnet 12B, for example. The opposite end 13D in the radial direction on the inner periphery of the spiral coil 13B is located on the outer peripheral side with respect to the rotating track 12C of the permanent magnet 12B. The winding start 13E and winding end 13F of the spiral coil 13B are located on the outer peripheral side of the rotating track 12C of the permanent magnet 12B. In FIG. 2, the rotating track 12 </ b> C of the permanent magnet 12 </ b> B is shown with a satin finish.

  As described above, according to the coreless generator 10 according to the present embodiment, the spiral coil 13B is wound while extending in the radial direction around the rotation shaft 14, and is rotated in the radial direction on the inner periphery of the spiral coil 13B. The shaft-side end portion 13C is located closer to the rotating shaft 14 than the rotating track 12C of the permanent magnet 12B, and the radially opposite end portion 13D on the inner periphery of the spiral coil 13B is from the rotating track 12C of the permanent magnet 12B. Since the distance between the permanent magnet 12B and the spiral coil 13B can be reduced by the thickness of the spiral coil 13B, the power generation efficiency can be improved. Moreover, since the crossing angle between the rotating track 12C of the permanent magnet 12B and the spiral coil 13B is close to a right angle, the power generation efficiency can be further improved. Furthermore, since the winding start 13E and winding end 13F of the spiral coil 13B are positioned on the outer peripheral side of the rotary track 12C of the permanent magnet 12B, the terminal processing of the spiral coil 13B can be facilitated. In addition, if the number of turns of the spiral coil 13B is increased, it is possible to effectively generate power even if the rotor 12 is rotated at a low speed. Therefore, the power generation efficiency can be improved with a simple structure, and for example, power can be generated even at a low rotation speed of the rotor 12 of about 550 rpm.

  FIG. 3 shows a configuration of a micro hydroelectric power generation system 20 according to an embodiment of the present invention. This micro hydroelectric power generation system 20 uses the coreless generator 10 according to the present embodiment, and includes a turbine 21, a coreless generator 10 that converts mechanical energy of the turbine 21 into electrical energy, and coreless power generation. A rectifier 22 that rectifies AC power generated by the machine 10, a storage battery 23 that stores DC power rectified by the rectifier 22, and an inverter 24 that converts DC power output from the storage battery 23 into AC power of 100V AC. ing.

  The water turbine 21 is preferably, for example, a top-type water turbine that is simple in structure and can be installed at low cost, and is disposed in agricultural water, a water discharge channel, or a water and sewage pipe. A speed increasing mechanism 25 or a link mechanism is preferably provided between the water turbine 21 and the coreless generator 10. The coreless generator 10 is configured to output, for example, a three-phase alternating current, and the rectifier 22 is configured to perform, for example, three-phase rectification. It is preferable to insert an overcharge control device 26 that prevents overcharge of the storage battery 23 between the rectifier 22 and the storage battery 23. The overcharge control device 26 controls charging by, for example, monitoring a charging voltage and a storage battery voltage. Further, it is preferable to connect an overdischarge control alarm device 27 for preventing overdischarge of the storage battery 23 to the inverter 24. For example, the overdischarge control alarm device 27 stops the inverter 24 and issues an alarm when a signal for lowering the storage battery voltage is input from the inverter 24.

  As described above, according to the micro hydroelectric power generation system 20 of the present embodiment, since the coreless generator 10 according to the present embodiment is used, it is possible to generate power even when the drive torque is small, and the coreless generator. The AC power generated by 10 is rectified, stored, and converted into AC 100V for use in ordinary households by the inverter 24. Therefore, even if the generated voltage is small, it is converted to a voltage that can be used in ordinary households. In addition, it is possible to obtain a stable output in both frequency and voltage.

  Therefore, small hydraulic energy such as agricultural water can be effectively used easily and inexpensively. In addition, since there is a need for waterways with a certain amount of head and water volume in the vicinity, there is practical power in places where distribution lines of general power companies are not nearby, such as mountain huts used in remote areas, mountainous areas, mountain climbing, etc. Can be supplied, and can also be used effectively as an emergency power source in the event of a major disaster. In addition, special technology and large-scale equipment are not required, and it can be manufactured and installed at low cost. Therefore, it can contribute to assistance to developing countries.

  The present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made. For example, in the above embodiment, the case where the housing 11 is provided with a pair of rotor disks 12A and one stator disk 13A disposed therebetween, but three or more rotors on the same rotating shaft 14 is described. The disks 12A may be disposed, and the stator disks 13A may be disposed between them.

  DESCRIPTION OF SYMBOLS 10 ... Coreless generator, 11 ... Housing, 12 ... Rotor, 12A ... Rotor disk, 12B ... Permanent magnet, 12C ... Rotating track, 13 ... Stator coil, 13A ... Stator disk, 13B ... Spiral coil, 13C ... End of rotating shaft side Part, 13D ... opposite end, 13E ... start of winding, 13F ... end of winding, 14 ... rotating shaft, 20 ... micro hydroelectric power generation system, 21 ... water turbine, 22 ... rectifier, 23 ... storage battery, 24 ... inverter, 25 ... increase Speed mechanism, 26 ... Overcharge control device, 27 ... Overdischarge control alarm device

Claims (2)

A rotor provided with a plurality of permanent magnets so that different polarities appear alternately in the circumferential direction with respect to the rotor disk fixed to the rotating shaft,
A stator coil provided with a plurality of coreless spiral coils in a circumferential direction so that a spiral surface faces a magnetic pole of the permanent magnet with respect to a stator disk fixed to a housing,
The spiral coil is wound to extend in a radial direction around the rotation axis,
The end portion on the rotating shaft side in the radial direction on the inner periphery of the spiral coil is positioned on the rotating shaft side with respect to the rotating track of the permanent magnet, and the opposite end portion in the radial direction on the inner periphery of the spiral coil is on the permanent magnet Located on the outer circumference side of
The coreless generator characterized in that the winding start and the winding end of the spiral coil are located on the outer peripheral side of the rotation track of the permanent magnet. With a water wheel,
The coreless generator according to claim 1, which converts mechanical energy of the turbine into electrical energy;
A rectifier that rectifies AC power generated by the coreless generator;
A storage battery for storing DC power rectified by the rectifier;
A micro hydroelectric power generation system comprising: an inverter that converts DC power output from the storage battery into AC power of 100 V AC.

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