CN104124825A - Variable-frequency generator - Google Patents
Variable-frequency generator Download PDFInfo
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- CN104124825A CN104124825A CN201410243897.0A CN201410243897A CN104124825A CN 104124825 A CN104124825 A CN 104124825A CN 201410243897 A CN201410243897 A CN 201410243897A CN 104124825 A CN104124825 A CN 104124825A
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- generator
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- frequency
- rotating shaft
- box body
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Abstract
The invention relates to a generator, and specifically relates to a variable-frequency generator that works under constant voltage. The variable-frequency generator comprises a box body, a diesel engine arranged in the box body, a stator, an armature slot formed in the sidewall of an inner circle of the stator, and a rotating shaft that forms a motor rotor; one shaft extension end of the rotating shaft is connected through a bearing, and while the other end of the rotating shaft is connected with a flywheel of the generator through an elastic steel sheet; a brushless exciter and a ventilating channel are arranged in the box body; an air inlet and an air outlet of the ventilating channel are guided by a pipeline and then extend out of the box body. According to the variable-frequency generator, the box body is easily cooled, the service life of the generator is long, the box body is lightweight, the running efficiency of the diesel engine is high, and the fuel consumption is small.
Description
Technical field
The present invention relates to a kind of generator, be specifically related to a kind of frequency conversion generator of working under constant voltage.
Background technology
In some specific application scenarios, variable-frequency power generation unit often, as the supply system of electric energy, is sent the electric power supply that meets drive motor-generator system and converters group by diesel engine drives frequency conversion generator.Drive motor-generator system can meet the requirement of generator realization and the charging demand under 10Hz operating mode of high-voltage charger,, by frequency conversion generator, to converters group, powers meanwhile, meets the instrument and equipment power reguirements of system.
Diesel engine is under the control of electric-control system and auxiliary control system, drag frequency conversion generator with constant-speed operation under 2500 revs/min and 1950 revs/min of two speed, according to frequency conversion generator demanded power output, automatically regulate Diesel engine distributive value, injection pressure and injection timing.
The following problem of existing frequency conversion generator ubiquity:
1, because frequency conversion generator and Diesel engine are arranged in same casing, the temperature in casing constantly raises, and dispels the heat slower, and the temperature of whole casing is difficult for cooling, and excess Temperature temperature is easy to cause generator failure, affects the useful life of generator;
2, the unit that Diesel engine and frequency conversion generator are integrally formed, the bad control of concentricity of two rotating elements, and also whole casing is heavier, is not easy to carrying;
3, the operational efficiency of Diesel engine is low, and fuel consumption is high.
Summary of the invention
The object of the invention is in order to overcome above-mentioned defect, the easily frequency conversion generator that operational efficiency is high, fuel consumption is low of light, the Diesel engine of cooling, generator long service life, box weight of a kind of casing is provided.
For achieving the above object, the frequency conversion generator of the present invention's design, comprise the armature slot of offering on Diesel engine, stator and the stator inner circle sidewall arranging in casing, casing, and the rotating shaft that forms rotor, a shaft extension end of described rotating shaft is that bearing connects, another shaft extension end of rotating shaft is connected with the flywheel of motor by elastic steel sheet, in described casing, be provided with brushless exciter, in described casing, be provided with ventilation air duct, the air inlet of described ventilation air duct, air outlet stretch out outside casing after being guided by pipeline.
In technique scheme, the frequency of moving during described generator underloading is 65Hz, and power is 20kW, and during generator overload, the frequency of operation is 83.3Hz, and power is 140kW.
The present invention adopts technique scheme, and tool has the following advantages:
1), in casing, be provided with ventilation wind path, and adopt monolateral wind path, monolateral wind path design makes the air inlet of the ventilation wind path in casing, air outlet stretch out casing after all being guided by pipeline, can play the object of taking into account cooling whole large casing like this, rapid heat dissipation, can control temperature in casing in normal range (NR), improve the useful life of generator and diesel oil motor.
2), generator adopts monolateral design bearing, rotating shaft only has a shaft extension end to connect with bearing, one end is directly connected on the flywheel of diesel engine by elastic steel sheet in addition, doing like this can be so that controls the concentricity of two rotating elements on diesel engine and frequency conversion generator, be beneficial to adjustment concentricity, keep concentricity consistency, motor has also saved a bearing simultaneously, make the whole weight saving of casing, be convenient to carrying.
3), generator carries exciter, adopts the mode of brushless excitation, makes field power supply and motor integration, and saved the devices such as electric brush slip ring that have brush excitation, improved the reliability of motor when operation.
4) double speed operation while, meeting frequency conversion, when underloading, operate under the power of 65Hz-20kW, standby condition corresponding to power autonomous system on application scenario, when overload, operate under the power of 83.3Hz-140kW, pulsed discharge state corresponding to power autonomous system on application scenario, improve the operational efficiency of diesel engine, saved the fuel consumption of diesel engine, reached fuel-efficient object.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the rearview of Fig. 1;
Fig. 3 is sectional structure schematic diagram in Fig. 1;
In figure, 1-casing; 2-stator; 3-rotating shaft; 4-armature slot; 5-pipeline; 6-bearing.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Frequency conversion generator as shown in Figure 1, Figure 2 and Figure 3, comprise casing 1, casing 1 interior setting Diesel engine, stator 2, form the rotating shaft 3 of rotor, on stator 2 inner circle sidewalls, offer armature slot 4, a shaft extension end of rotating shaft 3 is that bearing 6 connects, the other end of rotating shaft 3 is connected with the flywheel of motor by elastic steel sheet, in casing 1, be provided with brushless exciter, be provided with ventilation wind path in casing 1, the air inlet of ventilation wind path, air outlet stretch out outside casing 1 after being guided by pipeline 5.
The frequency of moving during generator underloading is 65Hz, and power is 20kW, and during generator overload, the frequency of operation is 83.3Hz, and power is 140kW.
The principle that frequency conversion of the present invention is chosen is as follows:
The frequency that comprises industry and civilian alternating current according to the alternating electromotive force network of national regulation is 50Hz, referred to as power frequency.On the boats and ships of China, except a large amount of employing power frequencies, also adopted the single-phase alternating current of 400Hz, be commonly referred to as intermediate frequency power supply, 50Hz and 400Hz are called as standard frequency.Specific to coming in the type selecting of the generator of frequency conversion generator unit, because engine peak speed is 2500r/min, according to frequency formula:
(1)
Wherein
for the number of pole-pairs of motor,
for motor speed.When
time,
, do not reach the standard of 50Hz, due to the restriction of diesel engine maximum speed, cause generator cannot get power frequency; When
time,
, when motor pole number get very high while being 20 utmost point, motor can reach the intermediate frequency 400Hz condition of getting.
According to the principle of design of electrical motor, the three-phase synchronous generator of domestic middle-size and small-size low pressure (400V) left and right, power bracket is at the stator winding of 5 ~ 2000kW, generally by semi-enclosed slot and loose lower two layer winding, most employing integer grooves, every extremely every phase groove numbers
.
the main and pole span of selection
it is relevant,
larger
should increase.
value has hero to generator waveform, supplementary load loss, temperature rise and insulating material consumption, from electric angle, considers, answers the present invention to make
, total groove number of motor stator so:
(2)
Wherein
for the number of phases, the generator in this unit is 3 like this, the number of pole-pairs that reaches 400Hz and take
in substitution formula (6), get
, the required minimum groove number of opening of motor stator while calculating 400Hz
.Meanwhile, because synchronous machine of the present invention exists
the maximum power of required output is 140kW, and generally the overload magnification of synchronous motor is about
.Therefore the average power of synchronous motor of the present invention is about:
(3)
,
under, for guaranteeing minimizing of motor volume and weight, select center high
standard synchronous motor, be sufficient for sb.'s need.The nominal outside diameter of the stator of synchronous machine of the present invention is
, internal diameter is
, under the size model of this stator, guaranteeing that motor electromagnetic performance is in rational scope, the number of pole-pairs of Gong selecting
, maximum number of pole-pairs can only get 5, and namely stator can only be slotted at most
, can not meet several 180 the requirement of slotting while getting 10 pairs of utmost points far away.Therefore, so, meeting under the prerequisite of power and minimum volume, the size restrictions of motor the selection of number of pole-pairs can not be too high, cannot get
, the frequency of synchronous generator of the present invention is also got the intermediate frequency 400Hz less than standard.
As the above analysis, the frequency of generator had both been got the power frequency 50Hz less than standard, also got the intermediate frequency 400Hz less than standard, can only take off-gauge frequency conversion so.Because the restriction of motor circumferential size, the groove number that motor stator inner circle is opened is too much unsuitable, known according to formula 2, selected number of pole-pairs
should smallerly be advisable.Because the output of 2 utmost point motors is larger aspect harmonic wave, and exist a series of vibration and noise problem, so do not select
, finally adopted
4 utmost point three-phase synchronous generators.Therefore, according to formula 1, calculate, the rated frequency of frequency conversion generator of the present invention is
.
According to the feature of power autonomous mode of operation, can find out, whole system only has requirement to voltage and the power of diesel engine-generator unit output of the present invention, and frequency be there is no to rigid requirement, so generator is taked the mode of frequency conversion in the course of the work, is feasible.Meanwhile, frequency conversion also has following two advantages:
1 because power autonomous system at the needed power of stage of preparing little (20kW), this time, the rotating speed of diesel engine-generator of the present invention subsystem can run to the maximum (top) speed of 2500r/min, reduction rotating speed operation that can be suitable, can alleviate the load of subsystem of the present invention like this, reduce the loss of diesel engine and generator, improve the useful life of the two;
2 is known according to the basic operation logic of diesel engine, when diesel engine work maximum (top) speed 70% ~ 80% time, now the output energy of diesel engine and the ratio of oil consumption are maximum, diesel engine is most effective.Therefore, in the preparatory stage of system, rotating speed does not need to reach maximum speed yet, can play fuel-efficient, efficient effect yet.
According to above-mentioned analysis, synchronous generator is taked the scheme of constant pressure frequency conversion, and its rated frequency is the 83.3Hz under 2500r/min, relative theory and the Efficiency of Diesel Engine maximization principle of comprehensive design of electrical motor, the second working speed of motor is chosen to be 1950r/min, and corresponding frequency is 65Hz.
Through synchronism test analysis, from the close distribution map of magnetic of the present invention, the magnetic of the iron core of the model machine of synchronous generator of the present invention is close from zero load, to rated power load, arrive again overload, the close increase gradually of magnetic, wherein when overload (140kW) magnetic closely substantially leveled off to saturatedly, maximum tooth is connected airtight nearly 2.1T.This explanation, under generator size provided by the invention, the utilance of ferromagnetic material has reached maximization, that is to say that this motor size is of a size of the minimum value that can meet power autonomous system demanded power output, can be so that the weight of system is as much as possible little.
Meanwhile, from synchronism test analytical voltage waveform, motor of the present invention is in zero load, and phase voltage amplitude when nominal load and overload all can be stabilized in 330V left and right, and the effective value that converts line voltage to has
, so the output line voltage of motor of the present invention meets design requirement.
In conjunction with load current waveform, checking is under given bearing power condition again, and the value of its electric current is: I
m-20kw=50A, I
m-64kw=160A, I
m-140kw=350A,
therefore calculating three kinds of actual powers under load state is:
Therefore, the checking situation of the power calculation from formula 4,5,6, the design of synchronous generator model machine of the present invention is also to meet the power requirement of system.
The part that the present invention does not explain is prior art.
Claims (2)
1. a frequency conversion generator, comprise casing (1), the Diesel engine arranging in casing (1), the armature slot (4) of offering on stator (2) and stator (2) inner circle sidewall, and the rotating shaft (3) that forms rotor, it is characterized in that: a shaft extension end of described rotating shaft (3) is that bearing (6) connects, another shaft extension end of rotating shaft (3) is connected with the flywheel of motor by elastic steel sheet, described casing is provided with brushless exciter in (1), described casing is provided with ventilation air duct in (1), the air inlet of described ventilation air duct, air outlet stretches out outside casing (1) after being guided by pipeline (5).
2. frequency conversion generator according to claim 1, is characterized in that: the frequency of moving during generator underloading is 65Hz, and power is 20kW, and during generator overload, the frequency of operation is 83.3Hz, and power is 140kW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410243897.0A CN104124825A (en) | 2014-06-04 | 2014-06-04 | Variable-frequency generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410243897.0A CN104124825A (en) | 2014-06-04 | 2014-06-04 | Variable-frequency generator |
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| Publication Number | Publication Date |
|---|---|
| CN104124825A true CN104124825A (en) | 2014-10-29 |
Family
ID=51770129
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|---|---|---|---|
| CN201410243897.0A Pending CN104124825A (en) | 2014-06-04 | 2014-06-04 | Variable-frequency generator |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2671211Y (en) * | 2003-11-28 | 2005-01-12 | 上海恒锦动力科技有限公司 | Diesel generator set |
| CN2833994Y (en) * | 2005-09-27 | 2006-11-01 | 潍坊柴油机厂 | Low-noise diesel generator set |
| CN101476505A (en) * | 2009-01-23 | 2009-07-08 | 上海扬科发动机进出口有限公司 | Generating set |
| CN201403017Y (en) * | 2009-04-28 | 2010-02-10 | 无锡华源凯马发动机有限公司 | Double air-inlet force-air cooling silent generator set structure |
| CN102684388A (en) * | 2011-03-10 | 2012-09-19 | 湖南华强电气有限公司 | Generator of motor compressor for vehicle air conditioner |
| CN203554195U (en) * | 2013-10-11 | 2014-04-16 | 上海狮虎能源科技股份有限公司 | Cooling system for a variable frequency generator |
-
2014
- 2014-06-04 CN CN201410243897.0A patent/CN104124825A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2671211Y (en) * | 2003-11-28 | 2005-01-12 | 上海恒锦动力科技有限公司 | Diesel generator set |
| CN2833994Y (en) * | 2005-09-27 | 2006-11-01 | 潍坊柴油机厂 | Low-noise diesel generator set |
| CN101476505A (en) * | 2009-01-23 | 2009-07-08 | 上海扬科发动机进出口有限公司 | Generating set |
| CN201403017Y (en) * | 2009-04-28 | 2010-02-10 | 无锡华源凯马发动机有限公司 | Double air-inlet force-air cooling silent generator set structure |
| CN102684388A (en) * | 2011-03-10 | 2012-09-19 | 湖南华强电气有限公司 | Generator of motor compressor for vehicle air conditioner |
| CN203554195U (en) * | 2013-10-11 | 2014-04-16 | 上海狮虎能源科技股份有限公司 | Cooling system for a variable frequency generator |
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Application publication date: 20141029 |