KR100758385B1 - Generator - Google Patents

Abstract

A generator is provided to generate an output voltage stably by adjusting field power in a main generating unit, and to minimize the influence of harmonic components due to the load of the generator by including a magnet in the main generating unit. A generator includes a main generating unit(20), an exciting unit(30), a controlling unit(50), and a control signal transmitting unit(70). The main generating unit(20) consists of a main stator(21) and a main rotor(23) which rotates in the main stator(21), and generates power. The exciting unit(30) supplies field power to the main generating unit(20). The controlling unit(50) detects an output voltage outputted from the main generating unit(20), and controls the exciting unit(30) based on the detected output voltage. The control signal transmitting unit(70) transmits a control signal to allow the controlling unit(50) to control the exciting unit(30). The main rotor(23) includes a plurality of main magnets(25) separated by a predetermined interval at the outer circumference.

Description

Generator {GENERATOR}

1 is a cross-sectional view of a conventional rotating field brushless synchronous generator.

2 is a cross-sectional view of a generator according to an embodiment of the present invention.

3 is an exploded cross-sectional view of FIG.

4 is a circuit diagram of FIG.

5 is a front view showing the rotor and the stator of the main power generation unit of FIG.

6 is a front view showing the rotor and the stator of the excitation portion of FIG.

7 is a front view showing the rotor and the stator of the auxiliary generating unit of FIG.

<Brief Description of Drawings>

20: main power generation unit 21: sub-sperm

30: excitation part 40: rotation axis

50: control unit 70: control signal transmission unit

90: auxiliary power generation unit

The present invention relates to a generator capable of minimizing the effects of harmonics generated in a load.

In general, emergency generators used in various buildings drive generators using internal combustion engines or small gas turbines using fossil fuel as an energy source, and small power supplies to the equipment that consumes the power generated therein. It can be seen as a power plant.

With the dissemination of computers, various generator-related equipments have been rapidly electronicized, and thus the various equipments require a higher quality power supply. However, the power equipment itself consumes power non-linearly, and many harmonic components generated by this are a major cause of disturbance of the power system.

In addition, when the commercial power is used, the capacity of the generator is very large, and even though power is consumed nonlinearly in various electronic equipment, the power supplied from the generator's point of view is almost linear. However, the emergency generator, which is responsible for supplying power to the facilities inside the building in an emergency, is a relatively small capacity generator, and therefore, special equipment must be added to smoothly supply power without the generator's hunting.

Hereinafter, the problems with the prior art will be described based on the drawings.

1 is a view illustrating a rotating magnetic field brushless synchronous generator of the conventional self-excited method.

Referring to FIG. 1, the conventional magnetic field magnetizing brushless synchronous generator is largely divided into a main generator and an exciter.

It is also divided into a stator and a rotor. A main generator field core 3 is formed in the rotor of the main generator on the outer circumferential surface of the generator rotation shaft 15, and a main generator field winding 4 is wound around the main generator field core 3. The main generator armature core 1 is formed in the stator of the main generator, and the main generator armature winding 2 is wound in the slot of the armature core 1.

On the other hand, the exciter is opposite to the main generator, the exciter electric magnet core 7 is formed on the outer circumferential surface of the generator rotary shaft 15, the exciter electric magnet winding 8 is wound around the exciter electric magnet core (7). An exciter field magnetic core 5 is formed in the stator, and an exciter field winding 6 is wound around the exciter field magnetic core 5.

DC power flows through the field windings 4 and 6 and the field cores 3 and 5 become electromagnetized due to the current flowing through the field windings 4 and 6. When the armature windings 2 and 8 intersect the magnetic flux in the magnetic field generated by the electromagnet, alternating current is generated in the armature windings 2 and 8. A rotor rectifier (9) is formed between the exciter armature winding (8) installed on the rotor of the exciter and the main generator field winding (4) installed on the rotor of the main generator, and is formed on the exciter armature winding (8). The generated alternating current is converted into direct current through the rotor rectifier 9 and supplied to the main generator field winding 4.

The electricity generated in the main generator armature winding (2) is supplied to the load facility through the generator output line 13, while a part is branched to the automatic voltage regulator 10 through the automatic voltage regulator input line (14) do. The automatic voltage regulator 10 allows the output voltage of the generator to be maintained at a predetermined constant voltage. The input terminal of the automatic voltage regulator 10 receives the output voltage of the generator, senses it, converts it into an appropriate DC current, and supplies it to the output terminal, and the DC current is input to the excitation field winding 6.

When the generator is first started, no electricity is generated because there is no magnetic component or current flow inside the generator. At this time, when the electricity of the storage battery 12 is supplied to the excitation field winding (6) through the initial excitation switch 11 connected to the automatic voltage regulator 10, the excitation field magnetic core (5) becomes an electromagnet As a result, electricity is generated in the exciter armature winding 8.

Subsequently, electricity is generated in the main generator armature winding 2 through the above-described process, and when the generated voltage reaches a preset voltage, the initial excitation switch 11 is automatically generated by the automatic voltage regulator 10. Is blocked. The automatic voltage regulator 10 maintains a constant voltage by sensing the voltage of the main generator armature winding 2 by itself and adjusting the amount of current fed back to the excitation field winding 6.

When the generator output voltage drops due to an increase in load, the automatic voltage regulator 10 increases the output current. On the contrary, when the generator output voltage increases, the automatic voltage regulator 10 reduces the output current to stabilize the voltage of the generator. Let's do it. Here, the automatic voltage regulator 10 detects the generator voltage and adjusts the voltage of the generator, and receives the power of the generator, converts it into a DC current, and supplies the excitation field winding 6 to the generator.

However, in the related art, when a harmonic component is contained in the generator output line 13 by a load connected to the generator, a failure may occur in the voltage sensing function of the automatic voltage regulator 10, and further, the exciter field winding 6 Since the harmonics are contained in the power supplied, the harmonics are amplified inside the generator, which may affect the main generator output voltage.

The present invention has been made to solve the problems of the prior art, an object of the present invention is to provide a generator that can stabilize the voltage transient characteristics, and provide a precise and stable voltage with a quick response.

Another object of the present invention is to provide a generator capable of generating a precision voltage by minimizing the effects of harmonics and distortion of voltage generated in a load.

Still another object of the present invention is to provide a generator that does not generate a total hunting phenomenon caused by a non-linear load by controlling the permanent magnet field power supplied to the main power generation unit as a separate power source.

The present invention for realizing the object of the present invention comprises a main power generating unit for generating electric power is composed of a main sperm and a main rotor rotated in the main An excitation unit for supplying field power to the main power generation unit; A control unit which senses an output voltage output from the main power generation unit and controls the excitation unit based on the detected output voltage; The control unit includes a control signal transmission unit for transmitting a control signal to control the excitation unit.

As described above, the present invention can supply the stable output power to the load by adjusting the field power supply of the excitation part by using the non-distorted signal while minimizing the influence of harmonic components.

Hereinafter, embodiments of the present invention will be described based on the drawings.

2 is a cross-sectional view of the generator according to an embodiment of the present invention, Figure 3 is an exploded cross-sectional view of Figure 2, Figure 4 is a circuit diagram of FIG.

Figure 5 is a front view showing the rotor and stator of the main power generation unit of Figure 2, Figure 6 is a front view showing the rotor and stator of the excitation part of Figure 2, Figure 7 shows the rotor and stator of the auxiliary power generation unit of Figure 2 Front view.

As shown in Figures 2 to 4, the present invention is composed of a main stator (21), the main generator (23) rotated in the main stator (21) for generating power; An excitation unit 30 for supplying field power to the main power generation unit 20; A control unit 50 for detecting an output voltage output from the main power generation unit 20 and controlling the excitation unit 30 using the detected output voltage; The control unit 50 includes a control signal transmission unit 70 for transmitting a control signal to control the excitation unit 30.

Here, the main power generation unit 20 and the excitation unit 30 is provided on the rotary shaft 40 to be spaced apart at a predetermined interval.

In this case, when the control unit 50 detects the increase or decrease of the output voltage when the main power generation unit 20 generates power, the control unit 50 controls the excitation unit 30 through the control signal transmission unit 70. That is, when the output voltage generated by the main power generation unit 20 drops, the field power generated by the excitation unit 30 is provided to the main power generation unit 20 through the control signal transmission unit 70. Shut off the power supply as high as possible.

In addition, the controller 50 includes a voltage regulator 51 to automatically adjust the voltage. Here, the voltage regulator may selectively use any one of a voltage regulator (VR) or an automatic voltage regulator (AVR).

As such, the output current generated by the main power generation unit 20 is supplied with the field power generated by the excitation unit 30 being controlled, thereby generating a clean and stable current in which load hunting does not occur.

As shown in Figure 2 and 5, the main rotor 23 preferably further comprises a plurality of main magnets 25 that are spaced apart at predetermined intervals on the outer peripheral surface.

Here, the main magnet 25 can concentrate the magnetic force to prevent the potato action of the residual magnetic flux generated in the main power generation unit 20.

And, the main magnet 25 is preferably arranged symmetrically about the center of the main rotor (23). At this time, it is preferable that the main magnets 25 are installed in four places in one group of three.

The main magnet 25 installed as described above suppresses the occurrence of the potato action of the residual magnetic flux.

As shown in Figures 2 and 6, the excitation portion 30 and the excitation rotor 31 is rotated together by the rotation of the rotary shaft 40; A female stator 33 corresponding to the female rotor 31; It is configured to include a plurality of female magnets 35 installed in the female stator (33).

Here, the female magnet 35 is preferably installed in six places in one group of three on the inner peripheral surface of the female stator (33). At this time, since the magnetic force is concentrated by the excitation magnet 35, the excitation magnetic flux generated in the excitation portion 30 of the excitation magnet 35 may be increased.

As shown in Figures 2 and 4, the control signal transmission unit 70 is connected to the control unit 50 and the signal transmitting unit 71 for transmitting a control signal generated by the control unit 50; A signal receiver 73 connected to the excitation unit 30 and receiving a control signal transmitted from the signal transmitter 71; A control signal processor 75 for converting the control signal received from the signal receiver 73 into an electrical signal and processing the signal; And a gate portion 77 for supplying field power generated to the excitation portion 30 by the processing signal processed by the control signal processing portion 75.

Here, the controller 50 may convert the control signal into a digital signal. The control signal processing unit 75 converts the received analog signal into a digital signal and transmits the converted analog signal to the gate unit 77. At this time, the gate unit 77 supplies the field power generated by the excitation unit 30 to the main rotor 23 according to the received signal.

In addition, since the gate part 77 adjusts the field power supply to the main rotor 23 according to the magnitude of the signal received by the signal receiving part 73, the output voltage is stably transferred to the load side without hunting. Supplied.

The control signal processing unit 75 and the signal receiving unit 73 form a hole 42 in the rotation shaft 40, and are electrically connected to each other by an electric wire 44 wired to the hole 42.

The gate portion 77 is preferably a silicon rectifying element. Here, the silicon controlled rectifier converts alternating current into direct current and adjusts the amount of field power.

On the other hand, it is preferable that the switching unit 60 is further provided between the main rotor 23 and the gate portion 77. Here, the switching unit 60 switches when a predetermined voltage or more is detected. That is, it is possible to prevent the abnormal voltage from being applied to the main rotor 23 by the switching unit 60.

The transmitter 71 and the receiver 73 use a light emitting element and a light receiving element that transmit and receive the control signal generated by the controller 50 with light, or the control signal generated by the controller 50. Frequency transmitting elements and frequency receiving elements that transmit and receive at frequencies can be used.

Here, the light emitting device and the light receiving device may use a photodiode, which is an optical sensor, may transmit a control signal by using an erection of light, and the frequency emitting device and the frequency receiving device may use a control signal by using a frequency intensity. Can be transmitted.

At this time, when the control signal is transmitted using the transmitter 71 and the receiver 73, since the distortion or noise of the signal generated from the general wire is not generated, it is possible to transmit a clean control signal.

As shown in FIG. 2 and FIG. 7, the auxiliary power generation unit 90 is installed on the rotary shaft 40 to generate an operating voltage and provide the generated operating voltage to the controller 50.

More specifically, the auxiliary power generation unit 90 is installed on the rotating shaft 40, the auxiliary rotor (93) having a plurality of auxiliary magnets (91); The auxiliary stator 93 is configured to include an auxiliary stator 95 connected to the control unit 50.

Here, the auxiliary power generation unit 90 is provided at the end of the rotating shaft 40 to be spaced apart from the excitation unit 30 by a predetermined interval, and supplies the operating voltage generated by the rotation of the rotating shaft 40 to the controller 50.

In addition, the auxiliary magnet 91 concentrates the magnetic force, thereby demagnetizing the residual magnetic flux generated in the auxiliary power generation unit 90. In addition, it is preferable that the auxiliary magnets 91 are installed at four locations on the outer circumferential surface of the auxiliary rotor 93 at predetermined intervals.

As such, since the auxiliary power generator 90 generates a voltage by itself and supplies the voltage to the controller 50, the controller 50 may minimize the influence of harmonics.

As such, the present invention can stably generate power without generating a load hunting shape by minimizing the influence of harmonics.

It is to be understood that the present invention is not limited to the above-described preferred embodiments but may be practiced in various ways without departing from the spirit of the present invention. If you grow up, you can easily understand. If the implementation by such improvement, change, substitution or addition falls within the scope of the appended claims below, the technical spirit is also regarded as belonging to the scope of the present invention.

According to the present invention, since the account power supply is provided to the main power generation unit, the output voltage is stably generated.

In addition, the present invention has the advantage that it is possible to minimize the influence of harmonic components generated by the load of the generator having a magnet in the main power generation unit.

In addition, since the present invention transmits a signal for controlling the excitation part using an optical signal or a frequency, there is an effect that the field power supply of the excitation part can be adjusted using an undistorted signal.

Claims (8)

A main power generation unit 20 configured to generate power by being composed of a main sperm 21 and a main rotor 23 rotated by the main sperm 21; An excitation unit 30 for supplying field power to the main power generation unit 20; In the generator comprising a control unit 50 for detecting the output voltage output from the main power generation unit 20, and controlling the excitation unit 30 based on the detected output voltage, The control unit 50 includes a control signal transmission unit 70 for transmitting a control signal to control the excitation unit 30, The main rotor (23) further comprises a plurality of main magnets (25) which are spaced apart at predetermined intervals on the outer peripheral surface. The method of claim 1, wherein the excitation part 30 An excitation rotor 31 which is rotated together by the rotation of the rotation shaft 40; A female stator 33 corresponding to the female rotor 31; Generator characterized in that it comprises a plurality of female magnets (35) installed in the female stator (33). The method of claim 1, wherein the control signal transmission unit 70 A signal transmitter 71 connected to the controller 50 for transmitting a control signal generated from the controller 50; A signal receiver 73 connected to the excitation unit 30 and receiving a control signal transmitted from the signal transmitter 71; A control signal processing unit 75 for converting and processing the control signal received from the signal receiving unit 73; And a gate portion (77) for supplying field power generated to the excitation portion (30) by the processing signal processed by the control signal processing portion (75). 4. The generator according to claim 3, wherein the gate portion (77) is a silicon rectifier element. The method of claim 3, wherein the transmitting unit 71 Generator, characterized in that the light emitting device for transmitting the control signal generated by the control unit as light. The method of claim 3, wherein the receiving unit 73 Generator, characterized in that the light receiving element for receiving the light of the control signal generated by the control unit (50). The generator according to claim 1, further comprising an auxiliary power generation unit (90) installed on the rotating shaft (40) to generate an operating voltage and to provide the generated operating voltage to the control unit (50). The method of claim 7, wherein the auxiliary power generation unit 90 An auxiliary rotor (93) installed on the rotating shaft (40) and having a plurality of auxiliary magnets (91); Generator corresponding to the auxiliary rotor (93), characterized in that the auxiliary stator (95) is connected to the control unit (50).

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