KR102293663B1 - Double field winding brushless synchronous generator removing distortion of output - Google Patents

Abstract

A double field winding brushless synchronous generator with improved output voltage distortion, wherein an exciter field, an exciter armature, an auxiliary generator field, an auxiliary generator armature, a generator field and a generator armature are installed in a first space of a housing, In the second space, a light emitting device for irradiating an optical signal according to the waveform of the load current of the generator armature and a light receiving device for receiving the optical signal irradiated from the light emitting device are installed, and depending on whether the light receiving device receives an optical signal from the auxiliary generator armature By controlling the current flowing into the generator field, distortion occurring in the output voltage of the generator is removed.

Description

Double field winding brushless synchronous generator removing distortion of output

To a brushless synchronous generator, and more particularly, to a brushless synchronous generator with improved output voltage distortion.

A brushless synchronous generator is a brushless generator that does not require a brush that supplies current to the field by supplying direct current to the field corresponding to the rotor of the generator. It refers to an alternator whose frequency of alternating current 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 not only interfere with the normal operation of the load, but also cause the load to fail. In a synchronous generator, an automatic voltage regulator (AVR) is installed, which stabilizes the output voltage of a brushless synchronous generator by maintaining the output voltage of the brushless synchronous generator constant regardless of load changes or system disturbance. do.

Hereinafter, the configuration and operation method of a conventional self-excited rotating field-type brushless synchronous generator will be described with reference to the drawings, and problems of the conventional self-excited rotating field-type brushless synchronous generator will be described.

1 is a longitudinal sectional view of a conventional self-excited rotating field type brushless synchronous generator. 1, the conventional self-excitation rotating field type brushless synchronous generator has a housing 10, a rotating shaft 20, an exciter field 31, an excitation armature 32, a generator field 41, a generator armature ( 42), an automatic voltage regulator (AVR, Automative Voltage Regulator) 50 , and a rectifier 60 . The conventional self-excited rotating field type Brisleyless synchronous generator is a main generator 40 for generating electric power output to the outside by a generator field 41 and a generator armature 42, and an exciter field 31 and an excitation armature ( 32), the exciter 30 that generates the excitation power output to the generator field 41 is distinguished.

In the conventional self-excited rotating field type brushless synchronous generator, the automatic voltage regulator 50 supplies electric power to the exciter field 31 . The exciter field 31 supplied with electric power generates magnetic flux. The exciter armature 32 generates electric power from the magnetic flux generated by the exciter field 31 . The electric power generated by the exciter armature 32 is supplied to the generator field 41 fixed to the rotating shaft 20 . The generator field 41 supplied with power generates a magnetic flux, and the generator armature 42 generates electric power from the magnetic flux generated by the generator field 41 . The electric power generated by the generator armature 42 is supplied to the load through the output terminal of the synchronous generator. And, the output of the generator is fed back to the automatic voltage regulator (50). The automatic voltage regulator 50 generates an exciter input current having an amount of current that is inversely proportional to the output voltage of the synchronous generator, and inputs the generated exciter input current to the exciter field 31 . The conventional self-excited rotating field-type brushless synchronous generator maintains the output voltage of the generator constant by sensing the output voltage of the generator and adjusting the amount of current fed back to the excitation field 31 .

When a load is applied to such a conventional self-excited rotating field type brushless synchronous generator, a load current flows in the winding wound around the generator armature 42 . Here, a load is a device that uses electric power. Conventional power devices connected to a load use AC as it is without converting the AC voltage or AC current generated by the generator into DC voltage or DC current. However, with the recent development of control technology and semiconductor devices, power devices using direct current instead of alternating current are increasing. Typical examples of devices using such a DC power supply include LED signboards, displays, lighting equipment, and the like.

Such a DC power supply converts AC to DC inside the device and uses it. When a device connected to a load converts AC voltage or current into DC voltage or current and uses it, harmonic currents are contained in the load current flowing in the line of the system that supplies power to the load, resulting in distortion that deforms the waveform of the load current. do. When the distorted current flows in the winding wound around the generator armature 42, the magnetic field generated by the generator armature 42 is affected, and there is a problem in that the waveform of the output voltage of the generator is also distorted.

In addition, when the distorted output voltage of the generator is applied to the above-described load, more distortion is generated in the load current flowing in the line of the system for supplying power to the load, and accordingly, the distortion of the waveform of the output voltage of the generator is accumulated and continues It may be amplified, and the automatic voltage regulator 50 that adjusts the output voltage of the generator malfunctions due to the distorted output voltage, which may cause problems of generating overvoltage in the generator.

In addition, when a distorted output voltage is applied to the load, electrical devices included in the load may not operate normally or internal components may be damaged.

An object of the present invention is to provide a double field winding brushless synchronous generator in which the distortion generated at the output of the synchronous generator is removed and the waveform of the output voltage has a sinusoidal shape. In addition, it is not limited to the technical problems as described above, and another technical problem may be derived from the following description.

A dual field winding brushless synchronous generator according to an embodiment of the present invention includes a housing; a rotating shaft having one end passing through one end of the housing and the other end passing through the partition wall of the housing to rotate by external force; an exciter field attached to the inner surface of the housing to generate magnetic flux; an exciter armature for generating electric power from the magnetic flux generated by the exciter field by rotating integrally with the rotating shaft within the housing; an auxiliary generator field attached to the inner surface of the housing to generate magnetic flux; an auxiliary generator armature for generating electric power from the magnetic flux generated by the auxiliary generator field by rotating integrally with the rotating shaft within the housing; Generator field winding and the auxiliary generator armature to generate magnetic flux from the electric power generated by the exciter armature and the auxiliary generator armature by rotating integrally with the rotating shaft in the housing, and through which the current generated by the exciter armature flows a generator field comprising a waveform correction field winding through which the current generated by the flow flows; and a generator armature attached to the inner surface of the housing to generate power output to the outside from the magnetic flux generated by the generator field, wherein the auxiliary generator armature causes distortion in the load current of the generator armature to generate the load current By supplying current to the waveform correction field winding of the generator field while the waveform of generate

The double field winding brushless synchronous generator senses a load current flowing in a load connected to an output terminal of the generator armature, and distortion occurs in the waveform of the load current based on the sensed load current so that the waveform of the load current is Further comprising an automatic voltage regulator for outputting a load current distortion control signal indicating whether the abnormality, wherein the automatic voltage regulator detects a load current flowing in a load connected to the output terminal of the generator armature, and distortion of the detected load current waveform a current distortion detection unit for detecting and generating a load current distortion control signal indicating whether the waveform of the load current is abnormal, based on the distortion of the load current waveform detected by the current distortion detection unit, and outputting the generated load current distortion control signal. and a control unit, wherein the current distortion detection unit compares the sensed load current with a sine wave signal having the same phase and crest value as the load current to detect the distortion of the load current waveform, and measure the magnitude of the load current, The distortion of the detected load current waveform is amplified in proportion to the magnitude of the measured load current.

The dual field winding brushless synchronous generator includes: a light emitting element installed in the housing and irradiating an optical signal based on a load current distortion control signal output from the automatic voltage regulator; a light receiving element installed at the other end of the rotating shaft to receive an optical signal irradiated from the light emitting element in the housing while rotating integrally with the rotating shaft; a switching element connected in series between the auxiliary generator armature and the generator field to control a current flowing into the waveform correction field winding or flowing out from the waveform correction field winding; and a switching driver outputting a signal for controlling on/off of the switching element to the switching element, wherein the light emitting element is turned on when the load current distortion control signal indicates that the waveform of the load current is abnormal, and the load current By turning off indicating that the waveform of A signal indicating whether the light emitting element is irradiated with an optical signal is input to the switching driver, and the switching driver turns on the switching element while the light emitting element is turned on based on the signal input from the light receiving element, and the light emitting element By turning off while the light is off, it is controlled so that the current flows from the auxiliary generator armature to the waveform correction field winding while distortion occurs in the waveform of the load current.

The switching element controls the direction of the current supplied to the waveform correction field winding according to the distortion of the load current waveform, and the switching element compares the load current with the sinusoidal wave signal so that the load current is greater than the sinusoidal wave signal. A current flows in a direction in which the waveform correction field winding generates a magnetic flux having the same direction as the magnetic flux generated by the generator field winding, and the load current is compared with the sinusoidal wave signal so that the load current is higher than the sinusoidal wave signal. When it is small, a current flows in the direction of generating a magnetic flux having a direction opposite to that of the magnetic flux generated by the generator field winding in the waveform correction field winding.

A cross-sectional area of the waveform correction field winding is larger than a cross-sectional area of the generator field winding, and the number of windings of the waveform correction field winding is smaller than the number of windings of the generator field winding.

The housing is divided into a first space and a second space by the partition wall, the second space is sealed, and the exciter field, the exciter armature, the auxiliary generator field, the auxiliary generator armature, and the generator field , the generator armature, the switching driver and the switching element are located in the first space, the light emitting element and the light receiving element are located in the second space, and the light emitting element transmits the optical signal to the second space of the housing. is irradiated toward the light receiving element.

The automatic voltage regulator includes: a voltage error detection unit for detecting an error in the output voltage of the generator armature by comparing the output voltage of the generator armature with a preset reference voltage; and an excitation current controller for generating a DC output voltage magnitude control signal having an amount of current inversely proportional to the detected output voltage error, and inputting the generated output voltage magnitude control signal to the exciter field.

The generator field is a generator field iron core fixed to the rotating shaft in a cylindrical shape; a generator field winding wound around the generator field iron core; a waveform correction field core fixed to the rotation shaft in a cylindrical shape; and a waveform correction field winding wound around the waveform correction field core, wherein the generator field core and the waveform correction field core are fixed to the rotation shaft to be spaced apart from each other.

In addition to the generator field winding, the waveform correction field winding is additionally wound around the generator field of the brushless synchronous generator, and the current is supplied to the waveform correction field winding only while the waveform of the generator output voltage is abnormal, thereby distorting the generator output voltage waveform. When this occurs, the distortion generated in the output voltage of the generator can be removed by correcting the magnetic field generated by the generator field. By removing the distortion from the output voltage of the brushless synchronous generator, the brushless synchronous generator can output an output voltage of a clean sinusoidal waveform.

In addition, in the brushless synchronous generator, the automatic voltage regulator detects the output voltage of the generator armature and controls the amount of voltage or current input to the excitation field of the brushless synchronous generator in inverse proportion to the error between the output voltage and the reference voltage. It controls the strength of the magnetic field generated by the machine and controls the amount of power supplied from the exciter armature to the generator field. By adjusting the magnitude of the power supplied to the generator field, the magnitude of the power output by the generator armature can be adjusted. The brushless synchronous generator controls the voltage or current input to the brushless synchronous generator by feeding back the output voltage, thereby maintaining the output of the generator at a constant level.

As described above, the double field winding brushless synchronous generator maintains the output voltage constant and outputs the output voltage waveform as a sinusoidal waveform without distortion, thereby greatly improving the reliability of the output voltage stabilization of the generator. . As the output voltage of the double field winding synchronous generator is stabilized, abnormal power such as overvoltage and overcurrent is not input to the electrical equipment connected to the output terminal of the generator, so the electrical equipment does not operate abnormally or malfunctions occur, thereby improving the stability of the electric equipment and Lifespan can be greatly improved.

1 is a longitudinal sectional view of a conventional self-excited rotating field type brushless synchronous generator.
2 is a longitudinal cross-sectional view of a double field winding brushless synchronous generator according to an embodiment of the present invention.
FIG. 3 is an equivalent circuit diagram of the double field winding brushless synchronous generator shown in FIG. 2 .
4 is a block diagram of the automatic voltage regulator shown in FIG.
FIG. 5 is a block diagram of the voltage error detection unit shown in FIG. 4 .
FIG. 6 is a block diagram of the current distortion detection unit shown in FIG. 4 .
7 is a longitudinal cross-sectional view of a double field winding brushless synchronous generator according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Embodiments of the present invention to be described below relate to a dual field winding brushless synchronous generator in which a winding is double wound around a generator field, and hereinafter will be briefly referred to as a “dual field winding brushless synchronous generator”. In addition, in the following, a side from which a current flows among terminals of an electric device may be simply called an “input end” or a side from which a current flows may be simply called an “output end”, and direct current is referred to as “DC”. ” or simply “AC” for alternating current. In addition, numbers (eg, first, second, etc.) used in the description of the present invention below are used as identification symbols for distinguishing one component from other components.

2 is a cross-sectional view taken in the longitudinal direction from one end to the other end of the dual field winding brushless synchronous generator according to an embodiment of the present invention. 2, the double field winding brushless synchronous generator according to the present embodiment includes a housing 10, a rotating shaft 20, an exciter field 31, an exciter armature 32, an auxiliary generator field 91, Auxiliary generator armature (92), generator field (41), generator armature (42), automatic voltage regulator (AVR, Automative Voltage Regulator) (50), rectifier (60), light emitting device (71), light receiving device (72), It is composed of a switching driver 81 and a switching element 82 . Here, the generator field 41 and the generator armature 42 are classified as a main generator 40 as a part for generating externally output power, and the exciter field 31 and the excitation armature 32 are generator fields. The part that generates the excitation power output to (41) is classified into the exciter 30, and the auxiliary generator field 91 and the auxiliary generator armature 92 according to the change of the load current of the double field winding brushless synchronous generator. A part that generates auxiliary power output to the generator field 41 is classified as an auxiliary generator 90 . The above components are main components, and in the dual field winding brushless synchronous generator according to the present embodiment, other components may be added in addition to the above components.

The housing 10 is formed in a cylindrical shape so that the rotor of the generator can rotate smoothly therein, and the inside thereof is divided into two spaces by a disk-shaped bulkhead 11 . Among the two spaces of the housing 10, the large space is a space for power generation, and therein is a rotating shaft 20, an exciter field 31, an excitation armature 32, an auxiliary generator field 91, and an auxiliary generator armature ( 92 , the generator field 41 , the generator armature 42 , the rectifier 60 , the switching driver 81 , and the switching element 82 are located. A small space among the two spaces of the housing 10 is a space for transmitting an optical signal between the light emitting device 71 and the light receiving device 72 , and the light emitting device 71 and the light receiving device 72 are positioned therein. As such, among the components positioned inside the housing 10, the rotating shaft 20, the exciter armature 32, the auxiliary generator armature 92, the generator field 41, the rectifier 60, and the switching driver 81 , the switching element 82 , and the light receiving element 72 are components rotated by the rotation shaft 20 and are collectively referred to as a rotor. On the other hand, the exciter field 31 , the auxiliary generator field 91 , the generator armature 42 , and the light emitting element 71 are components attached to and fixed to the housing 10 , and are collectively referred to as a stator.

The inner surface of the housing 10 should have a cylindrical shape so that the rotor of the generator can rotate smoothly, but the outer surface of the housing 10 may not necessarily have a cylindrical shape. The housing 10 is preferably provided with a plurality of exhaust ports for discharging the heat generated inside the generator to the outside.

One end of the rotation shaft 20 in the longitudinal direction passes through one end of the housing 10 and the other end passes through the partition 11 of the housing 20 to rotate by an external force. As shown in FIG. 2 , the rotation shaft 20 passes through a through hole formed in the center of one end of the housing 10 and a through hole formed in the center of the partition wall 11 . The ball bearing 12 is inserted between the rotation shaft 20 and the through hole at one end of the housing 10, and the ball bearing 12 is also inserted between the rotation shaft 20 and the through hole of the partition wall 11, so that the rotation shaft ( 20) can rotate smoothly. Examples of the external force for rotating the rotating shaft 20 include power of an internal combustion engine such as a diesel engine, hydraulic power, wind power, and the like. The rotating shaft 20 rotates the exciter armature 32, the auxiliary generator armature 92 and the generator field 41 coupled to the rotating shaft 20 by receiving the kinetic energy of the external power source and rotating to generate electric energy. do. One end of the rotating shaft 20 is connected to an external power source, and the other end of the rotating shaft 20 is provided with a light receiving element 72 .

The exciter field 31 is attached to the inner surface of the large space of the housing 10 and generates magnetic flux from the power of the output voltage magnitude control signal output from the automatic voltage regulator 50 . As shown in Fig. 2, the exciter field 31 is attached to the inner surface of the housing 10 in a cylindrical shape having a longitudinal cross-section shorter than the longitudinal length corresponding to the axial direction and fixed to the automatic voltage A magnetic flux in a direction perpendicular to the axial direction of the rotating shaft 20 is generated from the power of the output voltage magnitude control signal output from the regulator 50 . The exciter field 31 is composed of a cylindrical exciter field core 311 and an exciter field winding 312 wound around the exciter field core 311 . The magnetic field core 311 is fixed to the inner surface of the large space of the housing 10 , and a groove in which a winding can be wound is formed on the outer peripheral surface of the magnetic field core 311 . The exciter field winding 312 is wound in the groove of the exciter field core 311 . As will be described below, since direct current is supplied from the automatic voltage regulator 50 to the exciter field winding 312 , the exciter field winding 312 is one winding or a winding in which a plurality of windings are connected in one strand. and direct current flows through these windings.

The exciter armature 32 is attached to and fixed to the rotating shaft 20 located in the center of the housing 10, and rotates integrally with the rotating shaft 20 within the large space of the housing 10 to thereby excite the exciter field 31. power is generated from the magnetic flux generated by As shown in FIG. 2, the exciter armature 32 has a cylindrical shape having a longitudinal cross-section shorter than the longitudinal length corresponding to the axial direction of the rotating shaft 20, and the outer circumferential surface of the exciter field 31 Electric power is generated from the magnetic flux generated by the exciter field 31 by wrapping the The electric power generated by the exciter armature 32 is supplied to the generator field 41 . The exciter armature 32 is composed of an exciter armature core 321 having a cylindrical shape and an exciter armature winding 322 wound around the exciter armature core 321 . The excitation armature core 321 is fixed to the rotation shaft 20 , and a groove in which a winding can be wound is formed on the outer peripheral surface of the exciter armature core 321 . The exciter armature winding 322 is wound in the groove of the exciter armature iron core 321 . In this embodiment, the exciter armature winding 322 is wound around the exciter armature core 321 with three windings, and a three-phase alternating current is generated by the three-stranded exciter armature winding 322 .

The auxiliary generator field 91 is attached and coupled to the inner surface of the large space of the housing 10 to generate magnetic flux. As shown in FIG. 2, the auxiliary generator field 91 has a polygonal shape having a longitudinal cross-section having a length in the lateral direction shorter than the length in the longitudinal direction corresponding to the axial direction of the rotating shaft 20. It is fixed to the inner surface to generate magnetic flux in a direction perpendicular to the axial direction of the rotating shaft 20 . In the double field winding brushless synchronous generator according to this embodiment, the auxiliary generator field 91 is a permanent magnet.

The auxiliary generator armature 92 is attached to and fixed to the rotation shaft 20 located in the center of the housing 10, and rotates integrally with the rotation shaft 20 within the large space of the housing 10 to thereby rotate the auxiliary generator field 91. power is generated from the magnetic flux generated by As shown in FIG. 2, the auxiliary generator armature 92 has a cylindrical shape having a longitudinal cross-section shorter than the longitudinal length corresponding to the axial direction of the rotary shaft 20, and the outer circumferential surface of the auxiliary generator field 91 It generates electric power from the magnetic flux generated by the auxiliary generator field 91 by wrapping. Power generated by the auxiliary generator armature 92 is supplied to the generator field 41 .

The auxiliary generator armature 92 includes a cylindrical auxiliary generator armature core 921 and an auxiliary generator armature winding 922 wound around the auxiliary generator armature core 921 . The auxiliary generator armature core 921 is fixed to the rotation shaft 20 , and a groove in which a winding can be wound is formed on the outer peripheral surface of the auxiliary generator armature core 921 . The auxiliary generator armature winding 922 is wound in the groove of the auxiliary generator armature core 921 . In this embodiment, the auxiliary generator armature winding 922 is wound on the auxiliary generator armature core 921 with three windings, and a three-phase alternating current is generated by the three auxiliary generator armature windings 922 .

The generator field 41 is attached to and fixed to the rotation shaft 20 located in the center of the housing 10, and rotates integrally with the rotation shaft 20 in the large space of the housing 10 while the exciter armature 32 and A magnetic flux is generated from the electric power generated by the auxiliary generator armature (92). As shown in FIG. 2 , the generator field 41 rotates integrally with the rotary shaft 20 in a cylindrical shape having a longitudinal cross-section having a length in the transverse direction shorter than the length in the longitudinal direction corresponding to the axial direction of the rotary shaft 20 . A magnetic flux in a direction perpendicular to the axial direction of the rotating shaft 20 is generated from the electric power generated by the exciter armature 32 . The generator field 41 includes a cylindrical generator field core 411 , a generator field winding 412 wound around the generator field core 411 , and a waveform correction field winding 413 .

The generator field core 411 is fixed to the rotation shaft 20 in a large space of the housing 10 , and a groove in which a winding can be wound is formed on the outer peripheral surface of the generator field core 411 . The generator field winding 412 and the waveform correction field winding 413 are wound in the groove of the generator field core 411 . Currents from each of the rectifier 60 and the switching element 82 are supplied to the generator field 41 respectively, as will be explained below. More specifically, since the power generated by the exciter armature 32 is supplied to the generator field 41 through the rectifier 60, the generator field winding 412 is one winding or a plurality of windings are formed into one strand. It is a connected winding. In addition, since the power generated by the auxiliary generator armature 92 is supplied to the generator field 41 through the switching element 82 , the waveform correction field winding 413 is one winding or a plurality of windings are formed into one strand. It is a connected winding. Current flows through the generator field winding 412 and the waveform correction field winding 413 .

More specifically, the current flowing in the generator field winding 412 of the generator field 41 is direct current, and the current flowing intermittently in the waveform correction field winding 413 is alternating current. The current flowing in the generator field winding 412 is the current generated by the exciter armature 32 and is rectified into DC by the rectifier 60 and supplied to the generator field winding 413 . In contrast, the waveform correction field winding 413 generates a magnetic field that cancels the distortion generated in the output of the generator armature 42 . Distortion in the output of the generator armature 42 may be a bulge or a dent compared to a pure sinusoidal waveform. The waveform correction field winding 413 should generate a magnetic flux that reduces the magnetic field of the generator field 41 in the portion where the output of the generator is high compared to the pure sinusoidal waveform, and on the contrary, in the portion where the output of the generator is low compared to the pure sinusoidal waveform It is necessary to generate a magnetic flux that increases the magnetic field of the generator field 41 . An alternating current flows through the waveform correction field winding 413 to generate a magnetic flux that cancels the distortion generated in the load current of the generator. The switching element 82 rectifies the current generated by the auxiliary generator armature 92 into alternating current and supplies it to the waveform correction field winding 413 . The switching element 82 will be described in detail below.

The waveform correction field winding 413 is wound around the generator field core 41 to improve the waveform of the output of the generator as will be described below. Current flows intermittently in the waveform correction field winding 413 to cancel the distortion while the distortion occurs within one cycle of the output of the generator. While no distortion occurs in the output of the generator, the waveform correction field winding 413 should not flow current and generate a magnetic field. Since the magnetic flux needs to be generated only for a moment when the distortion occurs in the waveform correction field winding 413 , the inductance of the waveform correction field winding 413 must be smaller than the inductance of the generator field winding 412 . The inductance is proportional to the cross-sectional area of the winding and the number of turns. The waveform correction field winding 413 is wound less than the number of turns of the generator field winding 412 , and the cross-sectional area of the waveform correction field winding 413 is larger than that of the generator field winding 412 .

The generator armature 42 is attached and coupled to the inner surface of the large space of the housing 10 to generate electric power output from the magnetic flux generated by the generator field 41 to the outside. As shown in FIG. 2 , the generator field 41 wraps around the outer peripheral surface of the generator field 41 in a cylindrical shape having a longitudinal cross-section shorter than the longitudinal length corresponding to the axial direction of the rotating shaft 20 . As a result, electric power is generated from the magnetic flux generated by the generator field 41 . The generator armature 42 is composed of a generator armature core 421 having a cylindrical shape and three strands of the generator armature winding 422 wound around the generator armature core 421 . The generator armature iron core 421 is fixed to the inner surface of the large space of the housing 10 , and a groove in which a winding can be wound is formed on the outer peripheral surface of the generator armature iron core 421 . The generator armature winding 422 is wound in the groove of the generator armature iron core 421 .

In this embodiment, the generator armature winding 422 is wound around the generator armature core 421 with three windings, and a three-phase alternating current is generated by the three strands of the generator armature winding 422 . In the case of a three-phase alternator, the number of output lines of the generator armature 42 is three, but in the case of FIG. 2, due to the limitation of the cross-sectional view, the technology to which this embodiment belongs that the output lines of the generator armature 42 are shown as two It can be understood by those of ordinary skill in the art.

The automatic voltage regulator 50 is installed on the outside of the housing 10 and outputs an output voltage magnitude control signal which is a direct current having a voltage or current amount based on an error in the output voltage of the generator armature 42 to the exciter field 31 . At the same time, the reference current waveform and the load current flowing to the load connected to the output terminal of the generator armature 42 are sensed, and based on the sensed load current, the waveform of the load current is distorted to determine whether the waveform of the load current is abnormal. The indicated load current distortion control signal is output to the light emitting device 71 . In electrical installations, when a voltage that exceeds the rated voltage range or a voltage with a distorted waveform is input to each equipment, the electric equipment may operate abnormally or malfunction. voltage must be supplied.

The output voltage of the generator armature 42 fluctuates due to various causes. Since the load connected to the generator is not constant but continuously fluctuates, the output voltage of the generator also continuously fluctuates in conjunction with the fluctuating load. An example of the fluctuation of the output voltage may be a change in the magnitude of the output voltage or distortion of the output voltage waveform. The change in the output voltage of the generator is controlled by the amount of voltage or current applied to the exciter field 31 using the output voltage magnitude control signal of the automatic voltage regulator 50, and the load current distortion control signal of the automatic voltage regulator 50 This can be solved by adjusting the amount of voltage or current supplied to the generator field 41 using A detailed description of the automatic voltage regulator 50 will be described in detail below with reference to FIGS. 4 to 6 .

The rectifier 60 is coupled to the rotation shaft 20 and rotates integrally with the rotation shaft 20 in the large space of the housing 10 and rectifies the alternating current output from the excitation armature 32, thereby exciter armature 32. The alternating current output from the is converted into direct current and supplied to the generator field 41 . More specifically, the rectifier 60 is connected between the exciter armature winding 322 of the exciter armature 32 and the generator field winding 412 of the generator field 41, the current flowing into the generator field winding 412 is rectified from alternating current to direct current.

The light emitting device 71 is installed in the small space of the housing 10 and irradiates an optical signal to the small space of the housing 10 based on the load current distortion control signal output from the automatic voltage regulator 50 . For example, the light emitting element 71 is turned on when the waveform of the load current is abnormal due to distortion in the load current of the generator, and turns off when the waveform of the load current is normal because the distortion does not occur in the load current of the generator. The optical signal is irradiated toward the light-receiving element 72 located in the small space of the housing 10 while the waveform of the load current flowing through it is abnormal (while distortion occurs in the load current). Representative examples of the light emitting device 71 include an LED, an infrared lamp. As shown in FIG. 2 , the light emitting device 71 is installed at the center of the other end of the housing 10 positioned in the direction in which one end of the rotation shaft 20 extends, and transmits an optical signal to the light receiving device in the axial direction of the rotation shaft 20 . Investigate towards (72).

The light emitting element 71 converts the load current distortion control signal output from the automatic voltage regulator 50 into an optical signal and irradiates the converted optical signal toward the light receiving element 72 . The light emitting device 71 is turned on while the load current distortion control signal output from the automatic voltage regulator 50 indicates that the waveform of the load current is abnormal, and turns off while the waveform of the load current is normal. While the output load current distortion control signal indicates that the load current is abnormal, the optical signal is irradiated toward the light receiving element 72 located in the small space of the housing 10 . When the housing 10 is formed in a form in which a dome-shaped cover is coupled to a cylinder having both ends of a disk shape, the light emitting device 71 has a central hole in the dome-shaped cover so that the light emitting surface thereof is exposed to a small space of the housing 10 . By being inserted and coupled to the generator, an optical signal indicating that the waveform of the load current of the generator is abnormal can be irradiated toward the light receiving surface of the light receiving element 72 in the axial direction of the rotating shaft 20 .

The light receiving element 72 is installed at the other end of the rotation shaft 20 and rotates integrally with the rotation shaft 20 to receive an optical signal irradiated from the light emitting device 71 in a small space of the housing 10 . The light receiving element 72 converts the received optical signal into an electrical signal and outputs a signal having a voltage proportional to the intensity of the optical signal irradiated from the light emitting element 71 . For example, while the light emitting device 71 is turned on and an optical signal is irradiated from the light emitting device 71, the light receiving device 72 outputs a high 5 V signal, and the light emitting device 71 is turned off. During the period, the light receiving element 72 may output an OV signal in a low state. A typical example of such a light receiving element 72 may be a photodiode. In addition, when an infrared lamp is used as the light emitting element 71 in another embodiment of the present invention, the light receiving element 72 may be an infrared sensor. The light receiving element 72 converts the optical signal irradiated from the light emitting element 71 into an electrical signal, thereby inputting a signal indicating whether the light emitting element 71 is irradiated with the optical signal to the switching driver 81 . As shown in FIG. 2 , the light receiving element 72 receives an optical signal irradiated from the light emitting element 71 in the axial direction of the rotating shaft 20 by inserting a part of the body into the central groove of the other end of the rotating shaft 20 . do.

As described above, since the light emitting element 71 irradiates an optical signal in the axial direction of the rotating shaft 20 and the light receiving element 72 is installed at the center of the other end of the rotating shaft 20, even when the light receiving element 72 rotates, light is received. The device 72 can always receive the light signal irradiated from the light emitting device 71 . If the light emitting element 71 irradiates an optical signal in a direction other than the axial direction of the rotation shaft 20 or the light receiving element 72 is installed on the partition wall 11 rather than the center of the other end of the rotation shaft 20, the rotation shaft 20 ), the light receiving element 72 may receive the light signal irradiated from the light emitting element 71 once per rotation, resulting in the switching element 82 being repeatedly turned on/off.

The switching driver 81 is coupled to the rotation shaft 20 and rotates integrally with the rotation shaft 20 within the large space of the housing 10 , and is switched based on a high or low state of a signal output from the light receiving element 72 . The on/off of the element 82 is controlled. The switching driver 81 turns on the switching element 82 when the signal output from the light receiving element 72 is in a high state, and turns off the switching element 82 when the signal output from the light receiving element 72 is in a low state. . That is, the switching driver 81 outputs a high-state signal for turning on the switching element 82 while the light emitting element 71 is turned on, and turns off the switching element 82 while the light emitting element 71 is turned off. Outputs a low state signal. The switching driver 81 outputs a signal for turning on or off the switching element 82 to the switching element 82 based on the output signal of the light receiving element 72 .

The switching element 82 is connected in series between the auxiliary generator armature 92 and the generator field 41 and rotates integrally with the rotation shaft 20 in the large space of the housing 10 while being output from the switching driver 82. Short or open depending on the voltage of the signal. More specifically, the switching element 81 is connected in series between the auxiliary generator armature winding 922 and the waveform correction field winding 413 of the generator field 41 from the auxiliary generator armature 92 to the generator field 41 of The current flowing into the waveform correction field winding 413 or flowing out from the waveform correction field winding 413 is controlled. When the switching element 82 is turned on and short-circuited, the power generated by the auxiliary generator armature 92 is supplied to the generator field 41, and when the switching element 82 is turned off and opened, the auxiliary generator armature The power supplied from (92) to the generator field (41) is cut off. As described above, the switching element 82 controls the current flowing into the waveform correction field winding 413 based on the output signal of the light receiving element 72 .

More specifically, when the light emitting element 71 is turned on, the light receiving element 72 outputs a high state signal, and at this time, the switching driver 81 outputs a high state signal for turning on the switching element 82 . . Accordingly, the switching element 82 is turned on while the light emitting element 71 is turned on and short-circuited, thereby introducing a current from the auxiliary generator armature 92 to the waveform correction field winding 413 . Conversely, when the light emitting element 71 is turned off, the light receiving element 72 outputs a low-state signal, and at this time, the switching driver 81 outputs a low-state signal for turning off the switching element 82 . Accordingly, the switching element 82 is turned off while the light emitting element 71 is turned off and opened to block the current flowing from the auxiliary generator armature 92 to the waveform correction field winding 413 . Representative examples of the switching device 82 include a MOSFET, an insulated gate bipolar transistor (IGBT), and the like. When a MOSFET or IGBT is used as the switching element 82, the switching driver 81 is connected to the gate terminal of the MOSFET or IGBT, and when a high-state signal is input to the gate terminal, a current flows from the collector terminal to the emitter terminal flow, and no current flows when a low-state signal is input to the gate terminal.

In addition, the switching element 82 may be composed of a plurality of IGBTs connected in the form of a bridge. The plurality of IGBTs control the direction of the current flowing into the waveform correction field winding 413 of the generator field 41 based on the signal input from the switching driver 81 . As described above, when the distortion generated in the load current of the generator protrudes from the pure sinusoidal waveform (that is, when the load current is compared with a sinusoidal signal having the same phase and crest value as the load current, the load current is greater than the sinusoidal signal) In order to reduce the magnetic flux generated by the generator field winding 412, a current generating a magnetic flux having a direction opposite to the magnetic flux generated by the generator field winding 412 flows through the waveform correction field winding 413, and vice versa. When the current distortion is distorted than the pure sinusoidal wave waveform and the amount of current is reduced (that is, when the load current is smaller than the sinusoidal wave signal by comparing the load current with a sinusoidal wave signal having the same phase and peak value as the load current) Waveform correction field winding ( A current that generates a magnetic flux having the same direction as the magnetic flux of the generator field winding 412 flows through the 413 to supplement the magnetic flux generated by the generator field winding 412 . The direction of the current flowing through the waveform correction field winding 413 is changed according to the distortion of the load current. As described above, the switching element 82 changes the direction of the current supplied to the waveform correction field winding 413 according to the distortion of the load current based on the signal input from the switching driver 81 .

FIG. 3 is an equivalent circuit diagram of the double field winding brushless synchronous generator shown in FIG. 2 . Referring to FIG. 3 , the exciter armature winding 322 is Y-connected, and six diodes are attached to the exciter armature winding 322 to rectify the three-phase alternating current output from the Y-connected exciter armature winding 322 . is connected The three-phase alternating current output from the exciter armature winding 322 is rectified into direct current by a diode, and the rectified direct current flows to the generator field winding 412 wound around the generator field iron core 411 .

In addition, the auxiliary generator armature winding 422 is also Y-connected, and six diodes are connected to the auxiliary generator armature winding 422 to rectify the three-phase alternating current output from the Y-connected auxiliary generator armature winding 422. . The three-phase alternating current output from the auxiliary generator armature winding 422 is rectified into direct current by a diode, and the rectified direct current is wound on the generator field core 411 through the switching element 82 to the waveform correction field winding 413. flows

The generator field winding 412 and the waveform correction field winding 413 through which current flows generate magnetic flux, and the magnetic flux generated by the generator field winding 412 and the waveform correction field winding 413 is Y-connected generator armature winding ( 422) is affected. The Y-connected generator armature winding 422 generates and outputs a three-phase AC voltage from the magnetic flux generated by the generator field winding 412 and the waveform correction field winding 413 .

The output of the generator is fed back to the automatic voltage regulator 50 . The automatic voltage regulator 50 generates an output voltage magnitude control signal having a voltage or current amount based on a change in the output voltage of the generator, and outputs it to the exciter field 31 . More specifically, the automatic voltage regulator 50 outputs an output voltage magnitude control signal that is direct current having an amount of current that is inversely proportional to the change in the output voltage of the generator, and outputs the output voltage magnitude control signal to the exciter field of the exciter field 31 . It flows through the exciter field winding 312 wound around the iron core 311 . The exciter field winding 312 through which direct current (output voltage magnitude control signal) flows generates a magnetic flux, and the generated magnetic flux affects the Y-connected exciter armature winding 322 . The Y-connected exciter armature winding 322 generates a three-phase alternating current from the magnetic flux generated by the exciter field winding 312 .

In addition, the automatic voltage regulator 50 detects a load current flowing through the load, and outputs a load current distortion control signal indicating whether distortion has occurred in the load current to the light emitting device 71 . The light emitting element 71 is turned on or off based on the load current distortion control signal, and when the light emitting element 71 is turned on, a light signal is irradiated toward the light receiving element 72 .

The light receiving element 72 receives the optical signal irradiated from the light emitting element 71 and converts it into an electrical signal, and inputs the converted electrical signal to the gate terminals of the four IGBTs connected to the light receiving element 72 . The four IGBTs control the current generated from the auxiliary generator armature winding 422 to flow to the waveform correction field winding 413 . More specifically, a current may or may not flow in the waveform correction field winding 413 according to the on or off state of each of the four IGBTs, and the direction of the current flowing in the waveform correction field winding 413 may be varied. . The double field winding brushless synchronous generator according to this embodiment uses whether or not current flows in the waveform correction field winding 413 and the direction of the current flowing in the waveform correction field winding 413 to correct the distortion generated in the output waveform of the generator. Can be removed.

4 is a block diagram of the automatic voltage regulator shown in FIG. As described above, the automatic voltage regulator 50 outputs a DC output voltage magnitude control signal having a voltage or current amount based on an error in the output voltage of the generator to the exciter field 31, and also the reference current waveform and the generator A load current distortion control signal indicating whether distortion has occurred in the waveform of the load current flowing through the load connected to the output terminal of the armature 42 is output to the light emitting device 71 .

As a result of detecting an error in the output voltage of the generator, the automatic voltage regulator 50 increases the amount of voltage or current input to the exciter field 31 when the output voltage is lower than the reference voltage, and when the output voltage is higher than the reference voltage The amount of voltage or current input to the exciter field 31 is reduced. Since the magnetic flux generated by the exciter field 31 is increased or decreased in proportion to the magnitude of the current flowing in the exciter field winding 312, as a result, the voltage output from the generator armature 42 is the exciter field winding 312. changes according to the current flowing through it. Accordingly, the automatic voltage regulator 50 may maintain a constant voltage output from the generator armature 42 by adjusting the amount of voltage or current supplied to the exciter field 31 based on the error of the output voltage of the generator. .

In addition, the automatic voltage regulator 50 controls the current generated by the auxiliary generator armature 92 to be supplied to the waveform correction field winding 413 while the waveform of the load current of the generator field 41 is abnormal. More specifically, the automatic voltage regulator 50 is connected between the waveform correction field winding 413 and the auxiliary generator field winding 412 when the distortion of the load current waveform is detected as a result of detecting the distortion of the load current waveform of the generator. The switching element 82 is turned on to supply current to the waveform correction field winding 413, and when the distortion of the load current waveform is not detected, the switching connected between the waveform correction field winding 413 and the auxiliary generator field winding 412 The element 82 is turned off to cut off the current supply to the waveform correction field winding 413 . The automatic voltage regulator 50 controls the current supplied to the generator field 41 based on the distortion of the load current waveform, thereby removing the distortion generated in the waveform of the output voltage of the generator so that the generator produces an output voltage having a sinusoidal shape. make it possible to print

Referring to FIG. 4 , the automatic voltage regulator 50 outputs a part for outputting an output voltage magnitude control signal to control the magnitude of the output voltage of the generator and a part for outputting a load current distortion control signal to control the waveform of the load current is composed of The part for outputting the output voltage magnitude control signal is composed of a voltage error detection unit 501 for detecting an error of the output voltage and an excitation current control unit 502 for adjusting the excitation current supplied to the excitation field 31 . The voltage error detection unit 501 detects the output voltage of the generator to detect the magnitude of the output voltage, and compares the detected output voltage with a preset reference voltage to detect an error in the output voltage. The error of the output voltage is the difference between the output voltage and the reference voltage. The voltage error detection unit 501 inputs the detected error to the excitation current control unit 502 . A detailed description of the voltage error detection unit 501 will be described in detail below with reference to FIG. 5 .

The excitation current control unit 502 generates an output voltage level control signal that is a direct current having an amount of current based on the error input from the voltage error detection unit 501 and inputs the generated output voltage level control signal to the exciter field 31 . . The amount of current of the output voltage magnitude control signal is inversely proportional to the error between the output voltage and the reference voltage. More specifically, when the input error indicates that the output voltage of the generator is higher than the reference voltage, the excitation current controller 502 reduces the voltage or current amount of the output voltage magnitude control signal, and the input error indicates that the output voltage of the generator is the reference voltage. If it is lower than that, the voltage or current amount of the output voltage level control signal is increased.

The part outputting the load current distortion control signal of the automatic voltage regulator 50 senses the load current flowing in the load connected to the output terminal of the generator armature 42, and the current distortion for detecting the distortion of the waveform of the detected load current A current distortion control unit 504 that generates and outputs a load current distortion control signal indicating whether the waveform of the load current is abnormal based on the distortion of the load current waveform detected by the detection unit 503 and the current distortion detection unit 503 do.

The current distortion detection unit 503 detects a load current flowing through the load of the generator and compares the sensed load current with a sine wave to detect the distortion of the load current waveform. The current distortion detection unit 503 detects the distortion of the waveform of the load current by comparing the sensed load current with a sinusoidal signal having the same phase and peak value as the load current. The current distortion detection unit 503 compares the load current and the sinusoidal signal to detect a difference between the two signals. The part where the difference between the sinusoidal signal and the load current exists corresponds to the part where the distortion of the waveform of the load current occurs. Also, the current distortion detection unit 503 measures the magnitude of the load current and amplifies the detected distortion of the waveform of the load current in proportion to the magnitude of the measured load current. The current distortion detection unit 503 inputs the detected distortion of the load current waveform to the current distortion control unit 504 . A detailed description of the current distortion detection unit 503 will be described in detail below with reference to FIG. 6 .

The current distortion control unit 504 generates a load current distortion control signal indicating that the load current waveform is abnormal or normal based on the distortion of the load current waveform input from the current distortion detection unit 503, and controls the generated load current distortion. A signal is input to the light emitting element 71 . The light emitting element 71 irradiates an optical signal that is turned on or off based on the load current distortion control signal toward the light receiving element 72 . For example, the light emitting element 71 is turned on when the load current distortion control signal indicates that the waveform of the load current is abnormal, and is turned off when the load current distortion control signal indicates that the waveform of the load current is normal. ) to investigate.

FIG. 5 is a block diagram of the voltage error detection unit shown in FIG. 4 . Referring to FIG. 5 , the voltage error detecting unit 501 includes a transformer 5011 , a reference voltage generating circuit 5012 , a voltage error detecting circuit 5013 , a voltage error amplifying circuit 5014 , a pulse generating circuit 5015 , and hunting. It is composed of a generation prevention circuit 5016 and a pulse amplification circuit 5017. The transformer 5011 converts the output voltage of the generator armature 42 to a voltage appropriate for the circuits constituting the automatic voltage regulator 50, and converts the output voltage of the generator armature 42 into a voltage error detection circuit ( 5013).

The reference voltage generating circuit 5012 generates a reference voltage for comparison with the output voltage of the generator armature 42 . The reference voltage generating circuit 5012 generates a reference voltage having a size preset by a user, and inputs the generated reference voltage to the voltage error detection circuit 5013 . An example of the reference voltage of the size preset by the user may be a rated voltage of a load connected to an output terminal of the generator or a voltage corresponding to the capacity of the generator. The reference voltage is a reference voltage for determining whether there is a change in the magnitude of the output voltage of the generator armature 42 .

The voltage error detection circuit 5013 compares the output voltage of the generator armature 42 with a reference voltage preset by the user. More specifically, the voltage error detection circuit 5013 compares the output voltage of the generator armature 42 converted by the transformer 5011 with the reference voltage generated by the reference voltage generating circuit 5012, and provides a reference output and an output. Detected by voltage error. The voltage error detecting circuit 5013 inputs the detected error to the voltage error amplifying circuit 5014 .

The voltage error amplifying circuit 5014 amplifies the error detected by the voltage error detecting circuit 5013 . Even if the error between the reference voltage and the output voltage is small, the error between the reference voltage and the output voltage is amplified so that the error detection unit 501 can easily detect the error. The voltage error amplifying circuit 5014 inputs the amplified error to the pulse generating circuit 5015 . The pulse generating circuit 5015 generates a pulse signal based on the error input from the voltage error amplifying circuit 5014 . More specifically, the pulse generating circuit 5015 converts an error of an output voltage input in the form of an analog signal through an analog-to-digital converter, thereby generating a pulse signal having a pulse width associated with the error. The pulse width of the pulse signal decreases as the output voltage is lower than the reference voltage, and increases as the output voltage is higher than the reference voltage. The pulse generating circuit 5015 inputs the generated pulse signal to the pulse amplifying circuit 5017 and the hunting occurrence prevention circuit 5016 .

The hunting occurrence prevention circuit 5016 converts the pulse signal generated by the pulse generator circuit 5015 back into an analog signal and feeds it back to the voltage error amplifier circuit 5014 . The hunting occurrence prevention circuit 5016 converts the pulse signal generated by the pulse generator circuit 5015 back into an analog signal through an analog-to-digital converter, and inputs the converted analog signal to the voltage error amplifier circuit 5014 . By feeding back the pulse signal to the voltage error amplifier circuit 5014, hunting such as voltage hunting in the voltage error amplifier circuit 5014 can be prevented. The pulse amplifying circuit 5017 amplifies the pulse signal generated by the pulse generating circuit 5015 and inputs it to the excitation current control unit 502 .

The excitation current control unit 502 generates an output voltage level control signal that is a voltage or current input to the exciter field 31 based on the pulse signal input from the voltage error detection unit 501, and the generated output voltage level control signal is supplied to the exciter field (31). For example, the excitation current controller 502 may include a thyristor and a transformer (or a current transformer). The thyristor is connected between the transformer and the exciter field winding 312 , and the gate terminal of the thyristor is connected to the pulse amplifier circuit 5017 of the voltage error detection unit 501 . The pulse signal output from the pulse amplifier circuit 5017 of the voltage error detection unit 501 is input to the gate terminal of the thyristor of the excitation current control unit 502, and the thyristor is the excitation field 31 based on the pulse signal input to the gate. ) to supply voltage or current. The amount of current of the voltage or current supplied to the exciter field 31 by the thyristor is proportional to the pulse width of the pulse signal.

FIG. 6 is a block diagram of the current distortion detection unit shown in FIG. 4 . Referring to FIG. 6 , the current distortion detection unit 503 includes a current transformer 5031 , a current signal conversion circuit 5032 , a synchronization signal generation circuit 5033 , a sine wave generation circuit 5034 , a current distortion detection circuit 5035 , and a current It consists of a distortion amplifier circuit 5036, a current value measuring circuit 5037, and a hunting occurrence prevention circuit 5038. The current transformer 5031 detects a load current flowing in a load connected to an output terminal of the generator. The current transformer 5031 inputs the detected load current to the current signal conversion circuit 5032 , the synchronization signal generating circuit 5033 , and the current value measuring circuit 5037 .

The current signal conversion circuit 5032 converts the load current input from the current transformer 5031 into a voltage. More specifically, the current signal conversion circuit 5032 converts the input load current into a voltage having a waveform of a constant peak value regardless of the magnitude of the load current. The current signal conversion circuit 5032 inputs the converted voltage to the current distortion detection circuit 5035 .

The load current of the generator has a phase difference from the output voltage of the generator due to the power factor of the load. Since the output voltage of the generator and the load current are out of phase for the above reasons, a sine wave having the same phase as the load current is required to detect distortion in the waveform of the load current. The synchronization signal generating circuit 5033 analyzes the load current input from the current transformer 5031 and generates a trigger signal that is triggered at the start point of one cycle of the load current. The synchronization signal generating circuit 5033 inputs a trigger signal to the sine wave generating circuit 5034 .

The sine wave generating circuit 5034 generates a sine wave voltage having the same phase as the load current based on the trigger signal input from the synchronization signal generating circuit 5033 and having the same peak value as the voltage converted by the current signal converting circuit 5034. . The sine wave generating circuit 5034 generates a sine wave voltage having the same peak value as the voltage converted by the current signal converting circuit 5032 and having a waveform that is not distorted, starting one cycle at the same starting point as the trigger signal. The sine wave generator circuit 5034 inputs the generated sine wave voltage to the current distortion detection circuit 5035 .

The current distortion detection circuit 5035 compares the voltage input from the current signal conversion circuit 5032 with the sine wave voltage input from the sine wave generator circuit 5034 to detect the distortion of the load current waveform. More specifically, the current distortion detection circuit 5035 compares the voltage of the current signal conversion circuit 5032 with the sinusoidal voltage of the sine wave generator circuit 5034 to detect a difference between the two voltages. A portion in which a difference exists between the voltage of the current signal conversion circuit 5032 and the sinusoidal voltage of the sinusoidal wave generator circuit 5034 corresponds to a portion in which the waveform distortion occurs in the load current. If there is no distortion of the load current waveform, the voltage of the current signal conversion circuit 5032 and the sinusoidal voltage of the sine wave generating circuit 5034 match, so that there is no difference between the two voltages. Accordingly, the difference between the voltage of the current signal conversion circuit 5032 and the sinusoidal voltage of the sinusoidal wave generator circuit 5034 coincides with the distortion of the load current waveform. The current distortion detection circuit 5035 inputs the difference between the voltage of the current signal conversion circuit 5032 and the sine wave voltage of the sine wave generator circuit 5034 to the current distortion amplifier circuit 5036 .

For example, the current distortion detection circuit 5035 divides one cycle of the voltage input from the current signal conversion circuit 5032 and the sinusoidal voltage input from the sine wave generator circuit 5034 into 32 equal parts and compares them. The current distortion detection unit 5035 compares the voltage waveform converted from the load current with a clean sinusoidal waveform in each divided portion, and the part with a difference between the converted voltage waveform and the sinusoidal waveform is a portion in which distortion occurs in the load current, The part where there is no difference between the converted voltage waveform and the sinusoidal waveform is the part where the load current is not distorted.

The current value measuring circuit 5037 measures the magnitude of the load current detected by the current transformer 5031 . The current value measuring circuit 5037 inputs the detected magnitude of the load current to the current distortion amplifier circuit 5036 .

The current distortion amplifier circuit 5036 amplifies the difference between the voltage of the current signal conversion circuit 5032 detected by the current distortion detection circuit 5035 and the sinusoidal wave voltage of the sinusoidal wave generator circuit 5034 . Even if the distortion of the load current waveform is minute, the current distortion amplifier circuit 5036 enables the current distortion control unit 504 to easily detect the distortion of the load current waveform.

In addition, when amplifying the distortion of the load current waveform, the current distortion amplifier circuit 5036 amplifies the distortion of the load current waveform in proportion to the magnitude of the load current measured by the current value measuring circuit 5037 . As described above, when the waveform of the load current is distorted, as it affects the magnetic field generated by the generator armature 42, distortion occurs in the waveform of the generator output voltage, and the distortion of the waveform of the output voltage is gradually accumulated. continues to amplify As the distortion of the load current waveform increases, the distortion of the output voltage waveform also increases. In addition, as a factor affecting the distortion of the output voltage waveform, the magnitude of the load current, that is, the amount of current of the load current, also affects the distortion in addition to the magnitude of the distortion of the load current waveform. Even if the waveform of the load current is greatly distorted, if the magnitude of the load current itself is small, the strength of the magnetic field generated by the rotor is also weakened, so the effect of the waveform distortion of the load current on the output voltage waveform of the generator is small. The current distortion amplification circuit 5036 may finely control the waveform of the output voltage by amplifying the distortion of the load current waveform in proportion to the magnitude of the load current. In summary, the automatic voltage regulator 50 generates a load current distortion control signal indicating whether the waveform of the load current is abnormal based on the waveform and magnitude of the load current, and transmits the generated load current distortion control signal to the light emitting device. (71) is output. The current distortion amplifier circuit 5036 inputs the amplified load current waveform distortion to the hunting occurrence prevention circuit 5038 and the current distortion control unit 504 .

The hunting occurrence prevention circuit 5038 feeds back a signal representing the distortion of the load current waveform amplified by the current distortion amplifier circuit 5036 to the current distortion amplifier circuit 5036 . The hunting occurrence prevention circuit 5038 feeds back the signal representing the distortion of the load current waveform amplified by the current distortion amplifier circuit 5036 to the current distortion amplifier circuit 5036, thereby performing voltage hunting in the current distortion amplifier circuit 5036 ( hunting) can be prevented.

The current distortion control unit 504 generates a load current distortion control signal indicating that the load current waveform is abnormal or normal based on the distortion of the load current waveform input from the current distortion detection unit 503, and controls the generated load current distortion A signal is input to the light emitting element 71 . For example, the current distortion control unit 504 may be a PWM (Pulse Width Modulation) signal generating circuit. The PWM signal generating circuit converts the distortion of the load current waveform input from the current distortion amplifier circuit 5036 into a PWM signal using an analog-to-digital converter. For example, the PWM signal generating circuit is in a high state while the load current waveform is distorted, that is, while the load current waveform is abnormal, while the load current waveform is not distorted, that is, while the load current waveform is normal. Generates a PWM signal that is low. The current distortion control unit 504 inputs a load current distortion control signal, which is a PWM signal, to the light emitting device 71 .

As described above, the light emitting device 71 irradiates an optical signal that is turned on or off based on the load current distortion control signal output from the automatic voltage regulator 50 to the light receiving device 71 . The light emitting device 71 receives the load current distortion control signal from the current distortion control unit 504 of the automatic voltage regulator 50, and while the load current distortion control signal indicates that distortion has occurred in the load current waveform (ie, high state) is on) and turns off while the load current distortion control signal indicates that no distortion has occurred in the load current waveform (i.e., while in the low state), so that the light receiving element 72 receives an optical signal while distortion occurs in the load current waveform. investigate towards

The light receiving element 72 receives the optical signal from the light emitting element 71 and converts it into an electrical signal. The light receiving element 72 generates a signal in a high state while the light emitting element 71 is turned on and a light signal is emitted from the light emitting element 71 and in a low state while the light emitting element 71 is turned off. The light receiving element 72 inputs the generated signal to the switching driver 81 . The switching driver 81 controls on/off of the switching element 82 based on a high or low state of a signal output from the light receiving element 72 .

The switching driver 81 turns on the switching element 82 when the signal output from the light receiving element 72 is in a high state, and turns off the switching element 82 when the signal is in a low state. While the switching element 82 is on, the auxiliary generator armature winding 422 of the auxiliary generator armature 92 is connected to the waveform correction field winding 413 of the generator field 41, and generated by the auxiliary generator armature 92 The generated current flows to the waveform correction field winding 413 of the generator field 41 .

In contrast, while the switching element 82 is turned off, the auxiliary generator armature winding 422 of the auxiliary generator armature 92 and the waveform correction field winding 413 of the generator field 41 are opened to the auxiliary generator armature 92. The current generated by this does not flow to the waveform correction field winding 413 . The auxiliary generator armature 92 supplies current to the waveform correction field winding 413 of the generator field 41 while distortion occurs in the waveform of the load current of the generator armature 42, that is, while the waveform of the load current is abnormal, No current is supplied to the waveform correction field winding 413 of the generator field 41 while the waveform of the load current is not distorted, that is, while the waveform of the load current is normal. By supplying current to the waveform correction field winding 413 of the generator field 41 only while the waveform of the load current is abnormal, the magnetic flux generated by the generator field 41 is changed while distortion occurs in the waveform of the load current do. More specifically, the waveform correction field winding 413 generates a magnetic field that cancels the distortion generated in the output of the generator armature 42 . Accordingly, distortion generated in the output of the generator is eliminated.

7 is a longitudinal cross-sectional view from one end to the other end of the dual field winding brushless synchronous generator according to another embodiment of the present invention. Referring to FIG. 7 , a double field winding brushless synchronous generator according to another embodiment of the present invention includes a housing 10, a rotating shaft 20, an exciter field 31, an exciter armature 32, and an auxiliary generator field ( 91), auxiliary generator armature (92), generator field (41), generator armature (42), automatic voltage regulator (AVR, Automative Voltage Regulator) (50), rectifier (60), light emitting device (71), light receiving device ( 72), a switching driver 81, and a switching element 82. Here, other components except for the generator field 41 are the same as in the embodiment of the present invention shown in FIG. 2 . Except for the generator field 41, the housing 10, the rotating shaft 20, the exciter field 31, the excitation armature 32, the auxiliary generator field 91, the auxiliary generator armature 92, the generator armature (42) , an automatic voltage regulator (AVR, Automative Voltage Regulator) 50, a rectifier 60, a light emitting device 71, a light receiving device 72, a switching driver 81, and a detailed description of the switching device 82 above. I will replace it with what has been described.

The generator field 41 in another embodiment of the present invention is attached to and fixed to the rotation shaft 20 located in the center of the housing 10 , and rotates integrally with the rotation shaft 20 within the large space of the housing 10 . While generating a magnetic flux from the electric power generated by the exciter armature 32 and the auxiliary generator armature (92). The generator field 41 includes a cylindrical generator field core 411, a generator field winding 412 wound around the generator field core 411, a cylindrical waveform correction field core 414, and a waveform correction field core 414 ) is composed of a waveform correction field winding 413 wound around.

As shown in FIG. 7, the generator field iron core 411 of the generator field 41 has a cylindrical shape having a longitudinal cross-section shorter than the longitudinal length corresponding to the axial direction of the rotating shaft 20. 20) to generate a magnetic flux in a direction perpendicular to the axial direction of the rotating shaft 20 from the electric power generated by the exciter armature 32 by rotating integrally. In addition, the waveform correction field core 414 of the generator field 41 has a cylindrical shape having a longitudinal cross-section longer than the longitudinal length corresponding to the axial direction of the rotating shaft 20, and is integral with the rotating shaft 20. By rotating, a magnetic flux in a direction perpendicular to the axial direction of the rotating shaft 20 is generated from the electric power generated by the auxiliary generator armature 92 .

The generator field core 411 is fixed to the rotation shaft 20 in a large space of the housing 10 , and a groove in which a winding can be wound is formed on the outer peripheral surface of the generator field core 411 . The generator field winding 412 is wound in the groove of the generator field iron core 411 . Similarly, the waveform correction field core 414 is fixed to the rotating shaft 20 in the large space of the housing 10, and a groove in which a winding can be wound is formed on the outer peripheral surface of the waveform correction field core 414. The waveform correction field winding 413 is wound around the groove of the waveform correction field core 414 . Here, the generator field core 411 and the waveform correction field winding 414 are spaced apart from each other and fixed to the rotation shaft 20 .

Since the generator field core 411 and the waveform correction field core 414 are supplied to the generator field 41 through the rectifier 60, the electric power generated by the exciter armature 32 is supplied to the generator field as described above. The winding 412 is a single winding or a winding in which a plurality of windings are connected in one strand. In addition, since the power generated by the auxiliary generator armature 92 is supplied to the generator field 41 through the switching element 82, the waveform correction field winding 413 is one winding or a plurality of windings are formed into one strand. It is a connected winding. Current flows through the generator field winding 412 and the waveform correction field winding 413 .

More specifically, the current flowing in the generator field winding 412 of the generator field 41 is direct current, and the current flowing intermittently in the waveform correction field winding 413 is alternating current. The current flowing in the generator field winding 412 is a current generated by the exciter armature 32 and is rectified into DC by the rectifier 60 and supplied to the generator field winding 413 . In contrast, the waveform correction field winding 413 generates a magnetic field that cancels the distortion generated in the output of the generator armature 42 . Distortion in the output of the generator armature 42 may be a bulge or a dent compared to a pure sinusoidal waveform. The waveform correction field winding 413 should generate a magnetic flux that reduces the magnetic field of the generator field 41 in the portion where the output of the generator is high compared to the pure sinusoidal waveform, and on the contrary, in the portion where the output of the generator is low compared to the pure sinusoidal waveform It is necessary to generate a magnetic flux that increases the magnetic field of the generator field 41 . An alternating current flows through the waveform correction field winding 413 to generate a magnetic flux that cancels the distortion generated in the load current of the generator.

As described above, alternating current flows intermittently in the waveform correction field winding 413 . The magnetic flux is generated in the generator field core 411 on which the waveform correction field winding 413 is wound by the alternating current flowing through the waveform correction field winding 413 . Here, when the waveform correction field winding 413 and the generator field winding 412 are wound together on one generator field core 411, the waveform correction field winding 413 generates the generator field core 411. An induced voltage is generated in the generator field winding 412 due to the magnetic flux. The induced voltage generated in the generator field winding 412 affects the generator field winding 412 . An error may occur in the output voltage of the synchronous generator due to the voltage induced in the generator field winding 412 .

In order to solve this problem, a double field winding brushless synchronous generator according to another embodiment of the present invention includes a generator field winding 412 and a waveform correction field winding 413 spaced apart from each other in the generator field 41. 411) and the waveform correction field core 412 are wound separately. By separating and winding the generator field winding 412 and the waveform correction field winding 413 on different iron cores, it is possible to prevent the voltage induced by the generator field winding 412 from being attached to the waveform correction field winding 412 from occurring. . Accordingly, the current flowing in the generator field winding 412 is not affected by the eddy current. The dual field winding brushless synchronous generator according to another embodiment of the present invention can prevent an error in output voltage to always keep the output of the generator constant.

As described above, in the dual field winding brushless synchronous generator according to embodiments of the present invention, the generator field winding 412 and the waveform correction field winding 413 are wound around the generator field 41 . The generator field winding 412 and the waveform correction field winding 413 through which current flows generate magnetic flux, and the generator field 41 generates an output voltage from the magnetic flux generated by the generator field 41, and the generated output voltage is output as a load. Here, the automatic voltage regulator 50 controls the current flowing to the waveform correction field winding 413 based on the distortion of the load current waveform to correct the magnetic field generated by the generator field 41, thereby providing the generator armature 42. It is made to have a clean sinusoidal waveform that does not cause distortion in the waveform at the output voltage generated by it.

In addition, the automatic voltage regulator detects the output voltage of the generator armature and inputs a current having a voltage or amount of current that is inversely proportional to the error between the output voltage and the reference voltage into the exciter field, so that the output voltage generated by the generator armature is constant. to keep As described above, the double field winding brushless synchronous generator according to the embodiments of the present invention controls the voltage or current input to the generator by feeding back the output of the generator to maintain the output at a constant level and distortion generated from the output The reliability of the generator's output stabilization can be greatly improved by removing the As a result, abnormal power such as overvoltage, overcurrent, low voltage, and low current is not applied to the electrical equipment connected to the output of the generator, so the electrical equipment does not operate abnormally or malfunction, which greatly improves the stability and lifespan of the electric equipment. can

So far, preferred embodiments of the present invention have been mainly looked at. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated 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 11: bulkhead
20: axis of rotation
30: exciter
31: woman reporter
311: exciter field iron core 312: exciter field winding
32: exciter armature
321: exciter armature iron core 322: exciter armature winding
40: main generator
41: generator field
411: generator field iron core 412: generator field winding
413: waveform correction field winding 414: waveform correction field core
42: generator armature
421: generator armature iron core 422: generator armature winding
50: automatic voltage regulator
501: voltage error detection unit 502: excitation current control unit
503: current distortion detection unit 504: current distortion control unit
60: rectifier
71: light emitting element 72: light receiving element
81: switching driver 82: switching element
90: auxiliary generator
91: auxiliary generator field
92: auxiliary generator armature
921: auxiliary generator armature iron core 922: auxiliary generator armature winding

Claims (8)

A double field winding brushless synchronous generator comprising:
housing 10;
a rotating shaft 20 having one end passing through one end of the housing 10 and the other end passing through the partition 11 of the housing 10 and rotating by an external force;
an exciter field 31 attached to the inner surface of the housing 10 to generate magnetic flux;
an exciter armature 32 for generating electric power from the magnetic flux generated by the exciter field 31 by rotating integrally with the rotating shaft 20 within the housing 10;
an auxiliary generator field 91 attached to the inner surface of the housing 10 to generate magnetic flux;
an auxiliary generator armature (92) for generating electric power from the magnetic flux generated by the auxiliary generator field (91) by rotating integrally with the rotating shaft (20) in the housing (10);
A magnetic flux is generated from the electric power generated by the exciter armature 32 and the auxiliary generator armature 92 by rotating integrally with the rotating shaft 20 in the housing 10, and the exciter armature 32 a generator field 41 including a generator field winding 412 through which the current generated by the generator flows and a waveform correction field winding 413 through which the current generated by the auxiliary generator armature 92 flows; and
and a generator armature 42 attached to the inner surface of the housing 10 to generate power output to the outside from the magnetic flux generated by the generator field 41,
The auxiliary generator armature 92 supplies current to the waveform correction field winding 413 of the generator field 41 while distortion occurs in the load current of the generator armature 42 and the waveform of the load current is abnormal, Double field winding brush, characterized in that the waveform correction field winding (413) of the generator field (41) generates a magnetic field that cancels the distortion generated in the load current of the generator armature (42) while the waveform of the load current is abnormal lease synchronous generator. The method of claim 1,
A load indicating whether the waveform of the load current is abnormal by detecting a load current flowing in the load connected to the output terminal of the generator armature 42, and generating distortion in the waveform of the load current based on the sensed load current Further comprising an automatic voltage regulator 50 for outputting a current distortion control signal,
The automatic voltage regulator 50 is
a current distortion detection unit 503 for detecting a load current flowing in a load connected to an output terminal of the generator armature 42 and detecting distortion of a waveform of the detected load current; and
Based on the distortion of the load current waveform detected by the current distortion detection unit 503, generating a load current distortion control signal indicating whether the waveform of the load current is abnormal, and outputting the generated load current distortion control signal including a current distortion control unit 504,
The current distortion detection unit 503 detects the distortion of the load current waveform by comparing the sensed load current with a sinusoidal wave signal having the same phase and crest value as the load current, measures the magnitude of the load current, and detects the A double field winding brushless synchronous generator, characterized in that the distortion of the load current waveform is amplified in proportion to the magnitude of the measured load current. 3. The method of claim 2,
a light emitting device installed in the housing 10 and irradiating an optical signal based on a load current distortion control signal output from the automatic voltage regulator 50;
a light receiving element 72 installed at the other end of the rotation shaft 20 to receive an optical signal irradiated from the light emitting device 71 in the housing 10 while rotating integrally with the rotation shaft 20;
A switching element 82 connected in series between the auxiliary generator armature 92 and the generator field 41 to control the current flowing into the waveform correction field winding 413 or flowing out from the waveform correction field winding 413 . ); and
Further comprising a switching driver (81) for outputting a signal for controlling the on-off of the switching device (82) to the switching device (82),
The light emitting device 71 is turned on when the load current distortion control signal indicates that the waveform of the load current is abnormal and turns off indicating that the waveform of the load current is normal, so that the optical signal while the waveform of the load current is distorted is irradiated toward the light receiving element 72,
The light receiving element 72 converts the optical signal irradiated from the light emitting element 71 into an electrical signal, thereby inputting a signal indicating whether the light emitting element 71 is irradiated with the optical signal to the switching driver 81,
The switching driver 81 turns on the switching element 82 while the light emitting element 71 is turned on based on a signal input from the light receiving element 72 and turns off while the light emitting element 71 is turned off By doing so, a current is controlled to flow from the auxiliary generator armature (92) to the waveform correction field winding (413) while distortion occurs in the waveform of the load current. 4. The method of claim 3,
The switching element 82 controls the direction of the current supplied to the waveform correction field winding 413 according to the distortion of the load current waveform,
The switching element 82 compares the load current with the sinusoidal signal so that when the load current is greater than the sinusoidal signal, the waveform correction field winding 413 is the same as the magnetic flux generated by the generator field winding 412 . When a current flows in a direction to generate a directional magnetic flux, the load current is compared with the sinusoidal signal, and when the load current is smaller than the sinusoidal signal, the generator field winding 412 is connected to the waveform correction field winding 413. ), a double field winding brushless synchronous generator, characterized in that the current flows in a direction to generate a magnetic flux having a direction opposite to the magnetic flux generated by the The method of claim 1,
The cross-sectional area of the waveform correction field winding 413 is wider than that of the generator field winding 412,
A double field winding brushless synchronous generator, characterized in that the number of windings of the waveform correction field winding (413) is less than the number of windings of the generator field winding (412). 4. The method of claim 3,
The housing 10 is divided into a first space and a second space by the partition wall 11,
The second space is sealed,
The exciter field 31, the exciter armature 32, the auxiliary generator field 91, the auxiliary generator armature 92, the generator field 41, the generator armature 42, the switching driver ( 81) and the switching element 82 are located in the first space,
The light emitting element 71 and the light receiving element 72 are located in the second space,
The light emitting element (71) irradiates the optical signal from the second space of the housing (10) toward the light receiving element (72). 3. The method of claim 2,
The automatic voltage regulator 50 is
a voltage error detection unit 501 for detecting an error in the output voltage of the generator armature 42 by comparing the output voltage of the generator armature 42 with a preset reference voltage; and
An excitation current control unit 502 that generates a DC output voltage magnitude control signal having an amount of current inversely proportional to the detected output voltage error, and inputs the generated output voltage magnitude control signal to the exciter field 31 . Double field winding brushless synchronous generator, characterized in that it further comprises. The method of claim 1,
The generator field 41 is
a generator field iron core 411 fixed to the rotation shaft 20 in a cylindrical shape;
a generator field winding 412 wound around the generator field iron core 411;
a waveform correction field core 414 fixed to the rotation shaft 20 in a cylindrical shape; and
and a waveform correction field winding 413 wound around the waveform correction field core 414,
The dual field winding brushless synchronous generator, characterized in that the generator field core (411) and the waveform correction field core (414) are spaced apart from each other and fixed to the rotation shaft (20).

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