KR102202298B1 - Brushless synchronous generator having function of detecting rotator state - Google Patents

Abstract

The present invention relates to a brushless synchronous generator having a rotor state detection function. The generator comprises: an exciter generating excitation power; a main generator generating external power from magnetic flux generated from the excitation power generated by the exciter; a coreless generator generating power having a smaller voltage fluctuation range than the excitation power; a sensor module detecting at least one state value of a portion corresponding to at least one rotor of the exciter and the main generator while rotating with a rotating shaft; a wireless module driven by the power generated by the coreless generator and transmitting a wireless signal indicating the at least one state value detected by the sensor module while rotating with the rotating shaft; and a wireless repeater receiving the wireless signal transmitted by the wireless module. A rotor state is detected to be provided to the outside of the generator.

Description

Brushless synchronous generator having function of detecting rotator state}

It relates to a brushless synchronous generator, and more particularly to a brushless synchronous generator capable of detecting the state of a rotor.

Various electrical or electronic equipment are used in industrial sites and in everyday life. In modern society, power supply to various electric or electronic equipment must always be maintained seamlessly. When power supply is interrupted due to various reasons, emergency power generation facilities are generally operated to provide temporary power supply. If the power supply cannot be supplied due to a failure of the emergency power generation facility when the power supply is interrupted, various accidents may occur. Therefore, emergency power generation facilities must be maintained at all times, and the operation status of emergency power generation facilities must be monitored even during operation to confirm whether emergency power generation facilities are operating safely within the normal range. If an abnormal condition of the emergency power generation facility is detected, appropriate measures should be taken immediately to prevent the emergency power generation facility from being stopped.

A brushless synchronous generator is mainly used as a generator for emergency power generation facilities. A brushless synchronous generator is a brushless generator that does not require a brush that supplies current to such a field by supplying direct current to the field corresponding to the rotor of the generator. The rotor rotates in synchronization with a magnetic field, thereby generating alternating current by rotational speed. It refers to an alternator whose frequency is determined. Such a brushless synchronous generator generally generates electric power to be supplied to an external load by generating magnetic flux from electric power generated by an exciter. Fluctuations in the output voltage of a brushless synchronous generator may not only interfere with the normal operation of the load, but also cause a load failure. In the synchronous generator, an automatic voltage regulator (AVR) is installed that stabilizes the output voltage of the brushless synchronous generator by maintaining the output voltage of the brushless synchronous generator constant regardless of load fluctuations or system disturbances. do.

When the generator is running, various sensors are installed in the stator of the generator to monitor the condition of the generator. By analyzing the signals detected by these sensors, the operation status of the generator is monitored. In general, it monitors whether the generator is operating normally by detecting the voltage, current, power, frequency, power factor, temperature of the stator winding, insulation resistance, etc. of electricity flowing through the winding of the generator stator. It is not easy to monitor the condition of the rotor because the generator rotor is continuously rotating during the generator operation. The input voltage value, input current value, and winding temperature value for the field winding of the main generator corresponding to the generator rotor are factors that must be measured in grasping characteristics such as the no-load characteristic curve, short circuit characteristic curve, and power generation efficiency measurement of the main generator. . As follows, there have been attempts at detecting the state of the generator rotor.

Korean Patent Registration No. 10-0980811 "Method for detecting an abnormality in a rotating part of a rotating field type synchronous generator" discloses a rotating part sensing device that detects an output voltage, an output current, and a winding temperature of a generator rotor. Republic of Korea Patent Registration No. 10-1021195 "Multi-function digital automatic voltage regulation device for emergency rotating field type synchronous generator" discloses a rotor state detector that detects the input voltage, input current, winding temperature of the generator rotor. However, this prior art does not mention a power source for driving an element that rotates with the rotor of the generator.

Korean Patent Registration No. 10-1799970 "Self-diagnosis smart generator" discloses a temperature sensor that is mounted on the generator rotor and measures the temperature of the field winding of the rotor. In this prior art, since the driving power of the temperature sensor is wirelessly supplied to the temperature sensor, it is difficult to constantly supply the driving power of the temperature sensor due to magnetic fields and electromagnetic waves generated inside the generator. As a result, there was a problem that the error of the temperature value measured by the temperature sensor was very large.

Provides a brushless synchronous generator that detects the state of the rotor while rotating with the rotor inside the generator and provides it to the outside of the generator, while preventing errors in the detected value of the rotor state due to magnetic fields and electromagnetic waves inside the generator. There is. It is not limited to the above-described technical problem, and another technical problem may be derived from the following description.

The brushless synchronous generator according to the present invention includes a cylindrical housing; A rotation shaft having one end passing through one end face of the housing and the other end passing through the other end face of the housing and rotating by an external force; An exciter installed in the housing to generate excitation power by rotation of the rotation shaft; A main generator installed inside the housing to generate power output to the outside from a magnetic flux generated from the excitation power generated by the exciter by rotation of the rotation shaft; A coreless generator installed in the housing and generating power having a voltage fluctuation smaller than the excitation power by rotation of the rotation shaft; A sensor module for detecting at least one state value of a portion corresponding to at least one rotor of the exciter and the main generator while rotating together with the rotation shaft; A wireless module that is driven by the power generated by the coreless generator, rotates together with the rotation shaft, and transmits a wireless signal indicating at least one state value detected by the sensor module; And a wireless repeater installed outside the housing to receive a wireless signal transmitted by the wireless module.

The coreless generator may generate power having a voltage fluctuation width smaller than that of the excitation power by using a winding wound in a spiral coil type.

The coreless generator includes a ring-shaped coreless armature formed by rolling the insulating paper in a circle after attaching the cylindrical winding wound in a spiral coil type by pressing flat on insulating paper; And a plurality of permanent magnets disposed at predetermined intervals around an outer circumferential surface of the coreless armature.

The brushless synchronous generator is formed in the form of a wheel having a plurality of spokes, and further includes an armature bracket coupled to the rotation shaft to rotate integrally with the rotation shaft in a structure in which the rotation shaft is inserted into a central hole, and the coreless electric machine The ruler is attached to the outer circumferential surface of the armature bracket and can rotate according to the rotation of the rotating shaft.

The brushless synchronous generator further includes a plurality of magnetic brackets, each of which is formed in a straight shape, and is vertically attached to the inner peripheral surface of the housing at regular intervals, and each of the permanent magnets may be attached to an end of each of the magnet brackets.

The exciter includes an exciter, an exciter armature, and a rectifier, and the rectifier converts direct current converted from the alternating current output from the exciter armature using a wire passing through a space between the plurality of spokes into the generator field. Can be printed on.

The wireless module is attached to the rotation shaft and rotates together with the rotation shaft, and the brushless synchronous generator further includes a circular antenna installed around an inner circle of the housing centered on a point of the rotation shaft to which the wireless module is attached, , The wireless repeater may receive a wireless signal transmitted by the wireless module through the antenna.

The main generator may include a generator field and a generator armature, and the sensor module may include a voltage sensor unit connected to a winding input terminal of the generator field to detect an input voltage value for the winding of the generator field.

The main generator includes a generator field and a generator armature, and the sensor module may include a current sensor unit that detects an input current value for the winding of the generator field in a non-contact manner with respect to the winding of the generator field.

The main generator may include a generator field and a generator armature, and the sensor module may include a temperature sensor unit attached to an exposed portion of the winding of the generator field to detect a winding temperature value of the generator field.

The brushless synchronous generator according to the present invention is a sensor module that detects at least one state value of a portion corresponding to at least one rotor of the exciter and the main generator while rotating together with the rotating shaft, and is detected by the sensor module while rotating together with the rotating shaft. The state of the rotor while rotating with the rotor inside the generator by a wireless module that transmits a wireless signal indicating at least one state value that is set up, and a wireless repeater that is installed outside the housing and receives the wireless signal transmitted by the wireless module. Can be detected and provided to the outside of the generator.

In particular, the brushless synchronous generator according to the present invention is a coreless generator that generates power having a smaller voltage fluctuation than the excitation power generated by the exciter by the rotation of the rotating shaft in addition to the exciter and the main generator. In addition, since the wireless module is driven by the output power of the coreless generator, there is no error in the detected value for the state of the rotor due to unstable driving power of the wireless module. The output power of the exciter has a very large voltage fluctuation according to the change in the load of the generator, and the output power of the main generator is very high, so it is not suitable as a driving power source for the wireless module. The wireless power supply method is not suitable due to the magnetic field and electromagnetic waves inside the generator.

The coreless generator is a ring-shaped coreless armature formed by rolling an insulating paper round after a cylindrical winding wound in a spiral coil type is pressed flat on an insulating paper and a plurality of permanent magnets arranged at regular intervals around the outer circumference of the coreless armature. As implemented, it is possible to output alternating current with little amplitude fluctuation while having a small amplitude of the waveform even in a strong electromagnetic environment inside the generator. That is, the coreless generator can output AC suitable for operation power of electronic components of the wireless module. It is not limited to the effects as described above, and another effect may be derived from the following description.

1 is a longitudinal sectional view of a brushless synchronous generator according to an embodiment of the present invention.
2 is a cut-away view of a brushless synchronous generator according to an embodiment of the present invention.
3 is a cross-sectional view of a brushless synchronous generator according to an embodiment of the present invention.
4 is a diagram showing a manufacturing process of the coreless armature 61 shown in FIG. 1.
5 is a cross-sectional view of the coreless generator 60 shown in FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment of the present invention described below is capable of detecting the rotor state while rotating with the rotor inside the generator and providing it to the outside of the generator, while the error of the detected value for the rotor state due to magnetic fields and electromagnetic waves inside the generator is reduced. It relates to a brushless synchronous generator that does not occur. Hereinafter, such a brushless synchronous generator may be simply referred to as "brushless synchronous generator" or "generator".

1 is a longitudinal cross-sectional view of a brushless synchronous generator according to an embodiment of the present invention, and is a cross-sectional view taken in a longitudinal direction from the diameter of one end of the brushless synchronous generator to the diameter of the other end. Referring to FIG. 1, the brushless synchronous generator according to the present embodiment includes a housing 10, a rotating shaft 20, an exciter 30, a main generator 40, and an automatic voltage regulator (AVR) 50. ), a coreless generator 60, a sensor module 70, a wireless module 80, a wireless repeater 91, an antenna 92, an antenna connection line 93, and a monitor unit 100. The above-described components are main components, and the brushless synchronous generator according to the present embodiment may be configured by adding other components in addition to the above-described components. The brushless synchronous generator refers to a synchronous generator that does not require a brush to supply current to such a field by supplying direct current to a field corresponding to the rotor of the generator.

2 is a cut-away view of a brushless synchronous generator according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a brushless synchronous generator according to an embodiment of the present invention. In order to help understand the internal structure of the brushless synchronous generator according to the present embodiment, the longitudinal section is simplified and illustrated in FIG. 1. The housing 10, the rotating shaft 20, the exciter 30, the main generator 40, and the automatic voltage regulator 50 are common components of a brushless synchronous generator. The coreless generator 60, the sensor module 70, the wireless module 80, the wireless repeater 91, the antenna 92, and the antenna connection line 93 have a brushless synchronous generator according to the present embodiment in a rotor state. These are the characteristic components of this embodiment to have a detection function.

In order to show how the coreless generator 60, the wireless module 80, the wireless repeater 91, the antenna 92, and the antenna connection line 93 are specifically implemented inside the generator, these components are exposed. As far as possible, a part of the housing is shown in a cut-away state in FIG. 2 and a cross-sectional view of the wireless module 80 is shown in FIG. 3. As the drawings become more complex, the illustration of the sensor module 70 is omitted so as not to obstruct understanding of the present embodiment. As shown in FIG. 1, the sensor module 70 and the wireless module 80 are installed on the rotating shaft 20 and rotate together with the rotating shaft 20. When the sensor module 70 and the wireless module 80 are implemented as ultra-small and lightweight devices, it may not be a problem, but if the center of mass of the rotation shaft 20 is eccentric from the center of rotation, the centrifugal force due to the mass eccentricity This can cause an unbalance of the generator, resulting in vibration throughout the generator. A dummy for aligning the center of mass of the rotation shaft 20 may be additionally installed on the rotation shaft 20.

The housing 10 is formed in a cylindrical shape to allow the rotor of the generator to rotate smoothly therein. The inner surface of the housing 10 must have a cylindrical shape for smooth rotation of the rotor of the generator, but the outer surface may not have a cylindrical shape for fixing the generator. It is preferable that the housing 10 is sealed to prevent leakage of electromagnetic waves, noise, and the like to the outside and to prevent foreign substances such as dust from flowing into the interior.

The rotation shaft 20 has one end in its longitudinal direction passing through one end face of the housing 10 and the other end passing through the other end face of the housing 10 to rotate by external force. As shown in FIG. 1, the rotation shaft 20 passes through a through hole formed in the center of one end surface of the housing 10 and a through hole formed in the center of the other end surface of the housing 10. A ball bearing is inserted between the rotation shaft 20 and the through hole at one end surface of the housing 10, and a ball bearing is inserted between the rotation shaft 20 and the through hole at the other end surface of the housing 10. It can rotate smoothly. Examples of the external force that rotates the rotating shaft 20 may include power of an internal combustion engine such as a diesel engine, hydraulic power, and wind power. The rotating shaft 20 rotates by receiving the kinetic energy of such an external power source, thereby generating electric energy by rotating the exciter armature 32, the generator field 41, and the coreless armature 61 coupled to the rotating shaft 20. Make it possible. One end of the rotation shaft 20 is connected to a rotation shaft of an external power source such as a diesel engine.

The exciter 30 is installed inside the housing 10 to generate excitation power by rotation of the rotating shaft 20. In more detail, the exciter 30 is output from the automatic voltage regulator 50 by the rotation of the rotating shaft 20 to generate excitation power of a magnitude that varies according to the magnitude of the voltage input to the exciter 30. Let it. The exciter 30 is composed of an excitation machine 31, an excitation armature 32, and a rectifier 33.

The exciter 31 generates a magnetic flux that varies according to the magnitude of the input voltage of the exciter 30 corresponding to the magnitude of the output voltage of the automatic voltage regulator 50 from the output power of the automatic voltage regulator 50. In more detail, the excitation machine 31 is composed of a plurality of excitation machine cores and a plurality of excitation machine windings wound around each of the excitation machine cores, and each excitation machine from the automatic voltage regulator 50 When current flows into the magnetic winding, a magnetic flux that fluctuates according to the magnitude of the output voltage of the automatic voltage regulator 50 is formed around each of the excitation magnetic windings.

The exciter armature 32 is rotated by the rotation of the rotating shaft 20 to generate an excitation power that varies according to the magnitude of the magnetic flux generated by the exciter 31 from the magnetic flux generated by the exciter 31 Let it. In more detail, the exciter armature 32 is composed of at least one excitation electromechanical core and at least one exciter armature winding wound on each excitation electromechanical core multiple times, and when each exciter armature winding is rotated Excitation power that varies according to the magnitude of the magnetic flux generated by the exciter 31 is generated in each exciter armature winding.

The rectifier 33 rectifies the alternating current output from the exciter armature 32 to output a direct current converted from the alternating current output from the exciter armature 32 to the generator field 41. In more detail, the rectifier 33 is composed of a plurality of pairs of rectifying elements, and the input terminal is connected to the excitation armature 32 and the output terminal is connected to the generator field 41, thereby outputting the output from the excitation armature 32. The alternating current is converted into direct current and output to the generator field 41. A typical example of each rectifying device is a diode. As shown in FIG. 1, a coreless generator 60 is disposed between the exciter 30 and the main generator 40. The rectifier 33 outputs the DC converted from the AC output from the exciter armature 32 to the generator field 41 using a wire passing through the space between the plurality of spokes of the armature bracket 62. The other end of the lead wire having one end connected to the output terminal of the rectifier 33 is connected to the input terminal of the generator field 41. In FIG. 1, a part of such a wire is shown in a state covered by the armature bracket 62 and the current sensor unit 72.

The main generator 40 is installed inside the housing 10 to generate power output to the outside from the magnetic flux generated from the excitation power generated by the exciter 30 by the rotation of the rotation shaft 20. The main generator 40 is composed of a generator field 41 and a generator armature 42. The exciter armature 32 and the generator field 41 are elements that rotate according to the rotation of the rotation shaft 20 and correspond to the rotor of the generator. On the other hand, the exciter 31 and the generator armature 42 correspond to the stator of the generator as elements that are attached to and fixed to the housing 10 of the generator.

The generator field 41 is rotated by an external force to generate a magnetic flux that fluctuates according to the magnitude of the excitation power from the excitation power generated by the excitation armature 32. In more detail, the generator field 41 is composed of at least one generator field core and at least one generator field winding wound around each generator field core, and when current flows from the rectifier 33 to each generator field winding A magnetic flux that varies according to the magnitude of the excitation power generated by the exciter armature 32 is formed around each generator field winding.

The generator armature 42 generates electric power that varies depending on the magnitude of the magnetic flux generated by the generator field 41 from the magnetic flux generated by the generator field 41. In more detail, the generator armature 42 is composed of at least one generator armature core and at least one generator armature winding wound around each generator armature core, and when each generator field winding is rotated, the magnetic flux generated by the generator field Electric power that varies according to the size of is generated in each generator armature winding. When one generator armature winding is wound around the generator armature core, single-phase AC is generated by the generator armature 42, and when three generator armature windings are wound around each generator armature core, three-phase AC is generated. .

The automatic voltage regulator 50 increases the voltage output from the main generator 40 by increasing the voltage input to the exciter 30 when the voltage output from the main generator 40 decreases, and increases the voltage output from the main generator 40. When the output voltage increases, the voltage output from the main generator 40 is decreased by decreasing the voltage input to the exciter 30. That is, the automatic voltage regulator 50 is installed outside the housing 10 to output a direct current having a voltage or current amount inversely proportional to a change in the output voltage of the generator armature 42 to the exciter 31. Accordingly, the voltage output from the main generator 40 can be kept constant. If a voltage outside of its rated voltage range is input to the electrical installation, the electrical installation may operate abnormally or fail.

The coreless generator 60 is installed inside the housing 10 and has a smaller voltage fluctuation than the excitation power generated by the exciter 30 by the rotation of the rotating shaft 20 by using a winding wound in a spiral coil type. Generate power. The coreless generator 60 is composed of a coreless armature 61, an armature bracket 62, a plurality of permanent magnets 63, and a magnet bracket 64. The exciter 30 and the main generator 40 of the brushless synchronous generator use silicon steel as an iron core to increase the magnetic flux density. The coreless generator 60 is a generator that does not use such an iron core and has low power generation efficiency, but does not have cogging torque, so that the voltage fluctuation of the power generation is small. In particular, the coreless generator 60 of the present embodiment can generate power having a very small voltage fluctuation, that is, power having a constant output voltage by using a winding wound in a spiral coil type.

The coreless armature 61 is a ring-shaped armature manufactured by pressing and attaching a cylindrical winding wound in a spiral coil type on an insulating paper 611 by pressing it flat, and then rolling the insulating paper in a circle. 4 is a diagram showing a manufacturing process of the coreless armature 61 shown in FIG. 1. 4, the coreless armature 61 can be manufactured as follows. An enameled copper wire with a thickness of about 0.2mm is wound around a cylinder 500 times to produce a cylindrical winding wound in a spiral coil type. Subsequently, as shown in (a) of FIG. 4, a cylindrical winding wound in a spiral coil shape on a thin insulating paper 611 is pressed flat and attached. On the insulating paper 611, a flat winding 612 wound in a spiral coil shape is attached so that adjacent circular winding portions overlap each other.

Subsequently, as shown in (b) of FIG. 4, the insulating paper 611 to which the flat-plate winding 612 wound in a spiral coil shape is attached is rolled in a circle to form a ring shape. The coreless armature 61 is completed by performing epoxy molding 613 on the inner and outer circumferential surfaces of the ring-shaped assembly of the winding 612 and insulating paper 611 manufactured as described above in order to have adequate mechanical strength and electrical dielectric strength. . Both ends of the winding of the coreless armature 61 are connected to the wireless module 80 so that AC flows from the winding of the coreless armature 61 to the wireless module 80.

5 is a cross-sectional view of the coreless generator 60 shown in FIG. 1. 5A is a longitudinal sectional view of the coreless generator 60, and FIG. 5B is a cross sectional view of the coreless generator 60. Referring to FIG. 5, the armature bracket 62 is formed in a wheel shape having a plurality of spokes. The armature bracket 62 is coupled to the rotating shaft 20 in a structure in which the rotating shaft 20 is inserted into the central hole thereof and rotates integrally with the rotating shaft 20. The coreless armature 61 is attached to the outer circumferential surface of the armature bracket 62 and rotates according to the rotation of the rotation shaft 20. Depending on the structure of the brushless synchronous generator, the coreless armature 61 may be installed on a weight balance plate or a rectifier cooling plate installed in an existing rotor without manufacturing a separate armature bracket 62.

A plurality of permanent magnets 63 are disposed around the outer peripheral surface of the coreless armature 61 at regular intervals. As shown in FIG. 5, two permanent magnets 63 may be disposed around the outer circumferential surface of the coreless armature 61 at intervals of 180 degrees. Among the two permanent magnets 63, one of the two permanent magnets 63 has an N-pole and the other has an S-pole based on the surface facing the coreless armature 61. As each permanent magnet 63, a neodymium magnet having the strongest magnetism among currently known magnets is suitable, and is made about the size of a coin.

Each of the plurality of magnet brackets 64 is formed in a straight shape and is attached upright at regular intervals around the inner circumferential surface of the housing 10. As shown in FIG. 5, two magnetic brackets 64 may be disposed around the inner circumferential surface of the housing 10 at intervals of 180 degrees. Each permanent magnet 63 is attached to the end of each magnet bracket 64, thereby forming a small gap between the outer peripheral surface of the coreless armature 61 and each permanent magnet 63.

When the coreless armature 61 rotates, a single phase AC is generated in the coreless armature 61. As shown in Fig. 5, the winding of the coreless armature 61 has a structure in which circular winding portions adjacent to each other are overlapped, and by this structure, an alternating current with little amplitude fluctuation is generated while the amplitude of the waveform is small. As the coreless armature 61 rotates in each circular winding portion, a magnetic flux that changes with time is generated. Even if the magnetic flux generated in one circular winding part changes due to the strong electromagnetic wave inside the generator, it can be compensated by the magnetic flux in another circular winding part adjacent to it. Accordingly, an alternating current having little amplitude fluctuation while having a small amplitude of the waveform can be output from the winding of the coreless armature 61.

The sensor module 70 is attached to at least one rotor of the exciter 30 and the main generator 40 and rotates together with the rotation shaft 20, while at least one rotation of the exciter 30 and the main generator 40 At least one state value of the part corresponding to the former is detected. Here, at least one state value of a portion corresponding to at least one rotor of the exciter 30 and the main generator 40 means a state value of a rotor that cannot be measured outside the generator. Examples of at least one state value of the exciter armature 32 corresponding to the rotor of the exciter 30 include an output voltage value, an output current value, and a winding of the winding of the exciter armature 32 that cannot be measured outside the generator. And temperature values. Examples of at least one state value of the generator field 41 corresponding to the rotor of the main generator 40 include the input voltage value, input current value, and winding temperature for the winding of the generator field 41 that cannot be measured outside the generator. And value.

The generator of this embodiment detects an input voltage value, an input current value, and a winding temperature value for the winding of the generator field 41. These are the most important factors for determining the operating state of the generator. From the input voltage value and the input current value for the winding of the generator field 41, the no-load characteristic curve, the short-circuit characteristic curve, the power generation efficiency, and the automatic loss of the main generator 40 can be calculated. The user can safely operate the generator up to its rated capacity by monitoring whether the input voltage value, input current value, and winding temperature value for the winding of the generator field 41 are within the normal range. If the input voltage value, input current value, and winding temperature value for the winding of the generator field 41 are out of the normal range, the generator may rapidly deteriorate and fail.

The sensor module 70 may include a voltage sensor unit 71, a current sensor unit 72, and a temperature sensor unit 73. The voltage sensor unit 71 is connected to the winding input terminal of the generator field 41 to detect an input voltage value for the winding of the generator field 41. The voltage sensor unit 71 may be implemented as a multiplier. A multiplier is installed at both ends of the input terminal of the winding of the generator field 41. The multiplier is connected to the wireless module 80 so that the detection value of the multiplier is input to the wireless module 80. In general, the voltage of the generator field 41 is designed to operate at about 100 ~ 200V during the generator load operation, and the total resistance value of the winding of the generator field 41 is designed to be 10Ω or less. If the driving voltage of the wireless module 80 is 3.3V, the magnification of the multiplier is 220 times in consideration of safety. The resistance value of the multiplier is preferably 10 kΩ, which is 1000 times the resistance value of the winding of the generator field 41 so that the detected value is not affected by the generator operation characteristics.

The current sensor unit 72 detects an input current value for the winding of the generator field 41 in a non-contact manner with respect to the winding of the generator field 41. The current sensor unit 72 may be implemented as a Hall element type DC current sensor. Typically, a shunt is used to measure DC current. The current of the generator field 41 may flow a large current of more than 100A depending on the situation. Accordingly, as the size of the classifier increases and the weight increases, the rotation of the rotation shaft 20 is affected. If a shunt is installed in series in the winding circuit of the generator field 41, when a failure occurs, it may directly affect the operation of the generator, resulting in a great risk.

The Hall element type DC current sensor of the closed loop method using the Hall effect does not insert any element into the current path of the winding circuit of the generator field 41 and flows through the winding of the generator field 41 in a non-contact manner. Current value can be measured. The Hall element type DC current sensor is much lighter than the classifier, so it hardly affects the rotation of the rotating shaft 20. The Hall element type DC current sensor requires a small amount of driving power, and may receive driving power from the wireless module 80. The Hall element type DC current sensor is installed in a suitable place on the core of the generator field 41 so that the winding of the generator field 41 passes through the hall of the Hall element type DC current sensor.

The temperature sensor unit 73 is attached to the exposed portion of the winding of the generator field 41 to detect the winding temperature value of the generator field 41. The temperature sensor unit 73 may be implemented with a PT100Ω temperature sensor and a temperature sensor driver. The PT100Ω temperature sensor has good linearity with respect to temperature change compared to the temperature sensor using other elements, and the hysteria difference between temperature rise and fall is small, so the precision is high, and there is little change over time. The PT100Ω temperature sensor has a structure in which a thin platinum wire is wound on a thin plate-shaped insulator and is manufactured in a form that can be embedded in the winding of the generator field 41. The resistance value of the PT100Ω temperature sensor changes slightly depending on the temperature. The temperature sensor driver incorporating the Wheatstone Bridge detects such a change in resistance value and outputs the detected value to the wireless module 80. The temperature sensor driver requires a small amount of driving power, and may receive driving power from the wireless module 80.

The wireless module 80 is attached to the rotation shaft 20 and rotates together with the rotation shaft 20 and transmits a wireless signal indicating at least one state value detected by the sensor module 70. The wireless module 80 is driven by power generated by the coreless generator 60. The wireless module 80 is composed of a rectifier that converts the AC output from the coreless generator 60 to a constant voltage DC by rectifying and a wireless communication device that transmits and receives a wireless signal. The rectifier and the wireless communication unit of the wireless module 80 may be manufactured separately. The wireless module 80 has a built-in antenna for transmitting a Wi-Fi signal. As the antenna of the wireless module 80, an external antenna installed outside the wireless module 80 may be used instead of the built-in antenna, but as the wireless module 80 rotates at high speed, the external antenna may be deformed or damaged by its rotational force. It is not desirable.

The wireless repeater 91 is installed outside the housing 10 to receive a wireless signal transmitted by the wireless module 80. This embodiment adopts Wi-Fi communication to collect information on the operation state of the generator rotor and transmit it to the wireless repeater 91 installed outside the generator in a contactless manner. That is, the wireless module 80 transmits a Wi-Fi signal indicating at least one state value detected by the sensor module 70, and the wireless repeater 91 receives the Wi-Fi signal transmitted by the wireless module 80. . The brushless synchronous generator according to the present embodiment is a rotating shaft inside the generator by a sensor module 70 and a wireless module 80 rotating together with the rotating shaft 20, and a wireless repeater 91 installed outside the housing 10. While rotating together with (20), the state of the rotor can be detected and provided to the outside of the generator.

When each wireless repeater of Wi-Fi communication is set to AP (Access Point) mode, a unique static IP (Internet Protocol) address can be assigned to each wireless repeater. Therefore, crosstalk between generators does not occur when multiple generators are operated in parallel. In addition, each generator is convenient because it can directly access the Internet without going through other devices. Those of ordinary skill in the art to which the present embodiment belongs can recognize that other wireless communication techniques such as Bluetooth communication and ZigBee communication may be used instead of Wi-Fi communication.

The antenna 92 is a 360-degree circular antenna installed around the inner circle of the housing 10 centered on the point of the rotating shaft 20 to which the wireless module 80 is attached. As shown in Figure 2, the antenna 92 is a plurality of clips 921 attached at regular intervals around the inner circular circumference of the housing 10 centered on the point of the rotation shaft 20 to which the wireless module 80 is attached. ) May be installed around the inner circle of the housing 10.

The wireless repeater 91 receives the wireless signal transmitted by the wireless module 80 through the antenna 92. As for the repeater antenna of Wi-Fi communication, a straight antenna is mainly used. When a straight antenna is used as the antenna of the wireless repeater 91, the wireless module 80 attached to the rotary shaft 20 rotates around the rotary shaft 20, so the straight antenna of the wireless module 80 and the wireless repeater 91 There is a communication obstacle that is covered by the rotation shaft 20 between them. Since such communication failure occurs repeatedly at a predetermined period according to the rotational speed of the rotating shaft 20, the reception of the wireless repeater 91 for the transmission signal of the wireless module 80 is repeatedly cut off.

The wireless repeater 91 is a wireless module 80 through a 360-degree circular antenna 92 installed around the inner circle of the housing 10 centered on the point of the rotating shaft 20 to which the wireless module 80 is attached. Since the radio signal transmitted by the radio is received, even if the radio module 80 rotates around the rotation axis 20, the distance between the radio module 80 and the antenna 92 of the radio repeater 91 is covered by the rotation axis 20. The case of losing does not occur. Since the distance between the built-in antenna of the wireless module 80 and the antenna of the wireless repeater 91 is always kept constant, the signal waveform is not deformed due to the fluctuation of the distance between the antennas. Even if rotated around ), the communication quality between the wireless module 80 and the wireless repeater 91 can be maintained constant. As a result, even if the wireless module 80 rotates about the rotating shaft 20, the wireless repeater 91 can always receive the transmission signal from the wireless module 80 with high communication quality.

The brushless synchronous generator is manufactured in a structure surrounded by a sturdy metallic housing 10 as a magnetic field is formed therein and a number of parts rotating at high speed exist. In order to prevent accidents such as electric shock or fire due to electric leakage, the housing 10 is grounded. In this way, since the inside of the brushless synchronous generator is shielded by the housing 10, radio signals, electromagnetic waves, etc. generated inside the generator are not transmitted to the outside of the generator.

Korean Patent Registration No. 10-0980811 "Method for detecting an abnormality in a rotating part of a rotating field type synchronous generator" discloses a rotating part sensing device that detects an output voltage, an output current, and a winding temperature of a generator rotor. Republic of Korea Patent Registration No. 10-1021195 "Multi-function digital automatic voltage regulation device for emergency rotating field type synchronous generator" discloses a rotor state detector that detects the input voltage, input current, winding temperature of the generator rotor. However, this prior art does not mention a power source for driving an element that rotates with the rotor of the generator.

Korean Patent Registration No. 10-1799970 "Self-diagnosis smart generator" discloses a temperature sensor that is mounted on the generator rotor and measures the temperature of the field winding of the rotor. In this prior art, since the driving power of the temperature sensor is wirelessly supplied to the temperature sensor, it is difficult to constantly supply the driving power of the temperature sensor due to magnetic fields and electromagnetic waves generated inside the generator. As a result, there is a problem that the error of the temperature value measured by the temperature sensor is very large.

The excitation power generated by the exciter 30 is not suitable as a power supply for driving these because the voltage fluctuation range is very large according to the change in the load of the generator. Since the external output power generated by the main generator 40 has a very high voltage, it is almost impossible to lower the voltage to DC 3.3V or 5V, which is the operating voltage of general electronic components, and even if it is possible, the power loss is very high. . The supply of wireless power to the sensor module 70 and the wireless module 80 has the same problems as described above. The brushless synchronous generator according to this embodiment generates power having a smaller voltage fluctuation than the excitation power generated by the exciter 30 by the rotation of the rotating shaft 20 in addition to the exciter 30 and the main generator 40. The error of the detected value for the rotor state due to the unstable driving power of the wireless module 80 by having the coreless generator 60 and driving the wireless module 80 by the output power of the coreless generator 60 Does not occur.

The wireless repeater 91 receives a wireless signal representing at least one state value of a portion corresponding to at least one rotor of the exciter 30 and the main generator 40 from the wireless module 80, and receives in this way. Converts the generated wireless signal from the wireless module 80 to digital data representing at least one state value of a portion corresponding to at least one rotor of the exciter 30 and the main generator 40, and monitors the digital data. It is transmitted to the unit 100. The monitor unit 100 may be installed in the generator control panel.

The monitor unit 100 receives digital data representing at least one state value of a portion corresponding to at least one rotor of the exciter 30 and the main generator 40 from the wireless repeater 91, and the exciter ( 30) and at least one state value of a portion corresponding to at least one rotor of the main generator 40 is displayed so that the user can monitor the state of the generator rotor. The wireless repeater 91 and the monitor unit 100 communicate with each other by wire using RS485 serial communication. Based on Wi-Fi communication and RS485 serial communication as described above, the wireless module 80 may be a Transmission Control Protocol (TCP) server, and the monitor unit 100 may be a TCP client. When the monitor unit 100 requests the rotor state value required for the wireless module 80 installed on the rotating shaft 20, the wireless module 80 may collect the state value of the rotor and provide it to the monitor unit 100. have.

The antenna connection line 93 is a copper wire coated with an electrically insulating material, and electrically connects the antenna 92 and the signal receiving terminal of the wireless repeater 91 through a small through hole in the housing 10. The antenna connection line 93 passes through a through hole of the housing 10 with one end connected to the antenna 92, and the other end is connected to the signal receiving terminal of the wireless repeater 91. As shown in FIG. 3, a rubber packing may be pressed between the through hole of the housing 10 and the antenna connection line 93, thereby allowing the antenna connection line 93 to be stably fixed and inside the generator. Can be made to be sealed.

So far, the present invention has been looked at around its preferred embodiments. Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

10 ... housing
20 ... axis of rotation
30 ... excitation
31 ... female mechanic
32 .... Excitation Armature
33 ... rectifier
40 ... main generator
41 ... generator field
42 ... generator armature
50 ... automatic voltage regulator
60 ... coreless generator
61 ... Coreless armature
62 ... armature bracket
63 ... permanent magnet
64 ... magnetic bracket
70 ... sensor module
71 ... Voltage sensor part
72 ... Current sensor part
73 ... temperature sensor part
80 ... wireless module
91 ... wireless repeater
92 ... antenna
93 ... Antenna connection line
100 ... monitor

Claims (10)

A cylindrical housing 10;
A rotation shaft 20 having one end passing through one end face of the housing 10 and the other end passing through the other end face of the housing 10 to rotate by an external force;
An exciter 30 installed inside the housing 10 to generate excitation power by rotation of the rotation shaft 20;
A main generator 40 installed inside the housing 10 to generate power output to the outside from the magnetic flux generated from the excitation power generated by the exciter 30 by rotation of the rotation shaft 20;
A coreless generator (60) installed inside the housing (10) to generate power having a voltage fluctuation smaller than the excitation power by rotation of the rotation shaft (20);
A sensor module (70) for detecting at least one state value of a portion corresponding to at least one rotor of the exciter 30 and the main generator 40 while rotating together with the rotation shaft 20;
A wireless module that is driven by electric power generated by the coreless generator 60, rotates together with the rotation shaft 20, and transmits a wireless signal indicating at least one state value detected by the sensor module 70 ( 80); And
And a wireless repeater 91 installed outside the housing 10 to receive a wireless signal transmitted by the wireless module 80,
The wireless module 80 is attached to the rotation shaft 20 and rotates together with the rotation shaft 20,
Further comprising a circular antenna 92 installed around the inner circle of the housing 10 centered on the point of the rotation shaft 20 to which the wireless module 80 is attached,
The wireless repeater (91) receives a wireless signal transmitted by the wireless module (80) through the antenna (92). The method of claim 1,
The coreless generator (60) is a brushless synchronous generator, characterized in that generating power having a voltage fluctuation smaller than the excitation power by using a winding wound in a spiral coil type. The method of claim 2,
The coreless generator 60 is
A ring-shaped coreless armature 61 formed by rolling the insulating paper round after attaching the cylindrical winding wound in a spiral coil shape by pressing it flat on the insulating paper; And
A brushless synchronous generator comprising a plurality of permanent magnets (63) arranged at regular intervals around an outer circumferential surface of the coreless armature (61). The method of claim 3,
It is formed in the form of a wheel having a plurality of spokes, and is coupled to the rotation shaft 20 in a structure in which the rotation shaft 20 is inserted into a central hole, and further includes an armature bracket 62 that rotates integrally with the rotation shaft 20 and,
The coreless armature (61) is attached to the outer peripheral surface of the armature bracket (62) and rotates according to the rotation of the rotation shaft (20). The method of claim 3,
Each further comprises a plurality of magnetic brackets 64 which are formed in a straight shape and are vertically attached around the inner circumferential surface of the housing 10 at regular intervals,
Each of the permanent magnets (63) is a brushless synchronous generator, characterized in that attached to the end of each of the magnet bracket (64). The method of claim 4,
The exciter 30 includes an excitation machine 31, an excitation armature 32, and a rectifier 33,
The main generator 40 includes a generator field 41 and a generator armature 42,
The rectifier 33 outputs the DC converted from the AC output from the excitation armature 32 to the generator field 41 using a wire passing through the space between the plurality of spokes. Lease synchronous generator. delete The method of claim 1,
The main generator 40 includes a generator field 41 and a generator armature 42,
The sensor module 70 is a brush, characterized in that it comprises a voltage sensor unit 71 connected to the winding input terminal of the generator field 41 to detect an input voltage value for the winding of the generator field 41 Lease synchronous generator. The method of claim 1,
The main generator 40 includes a generator field 41 and a generator armature 42,
The sensor module 70 is brushless, characterized in that it comprises a current sensor unit 72 for detecting an input current value for the winding of the generator field 41 in a non-contact manner with respect to the winding of the generator field 41 Synchronous generator. The method of claim 1,
The main generator 40 includes a generator field 41 and a generator armature 42,
The sensor module 70 is a brushless synchronous generator comprising a temperature sensor unit 73 attached to the exposed portion of the winding of the generator field 41 to detect the winding temperature value of the generator field 41 .

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