WO2018105754A2 - Method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator - Google Patents
Method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator Download PDFInfo
- Publication number
- WO2018105754A2 WO2018105754A2 PCT/KP2017/000045 KP2017000045W WO2018105754A2 WO 2018105754 A2 WO2018105754 A2 WO 2018105754A2 KP 2017000045 W KP2017000045 W KP 2017000045W WO 2018105754 A2 WO2018105754 A2 WO 2018105754A2
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- WO
- WIPO (PCT)
- Prior art keywords
- air gap
- core
- gap
- braking force
- electromagnetic braking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
Definitions
- the invention relates to a method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator.
- the purpose of this invention is to suggest a method for producing the electric power with consuming less energy, by which electromagnetic braking force exerted on the rotor of electric generator is weakened.
- Figure 1 shows producing of electromagnetic braking force in ⁇ (air gap).
- Figure 2 shows the dispersion and distribution of electromagnetic braking force.
- Figure 3 and 4 are related to proving the Assumption 1 and 3.
- Figure 5 and 6 are related to proving the Assumption 2 and 3.
- Figure 7 and 8 shows technological structures which are formed ⁇ with "Virtual air gap” to take the “Gap core effect”.
- Figure 9 shows the practical structure of field pole before introducing "Gap core effect”.
- Figure 10 shows an example forming the "Virtual air gap” in the field pole. The dotted circle part indicates the "Virtual air gap”.
- the slash ⁇ II I II) indicates that the upper part and lower part are mechanically fixed at regular interval.
- the present invention relates to a method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator.
- the electromagnetic braking force is exerted on the rotor of electric generator.
- This electromagnetic braking force is represented as follows:
- F Electromagnetic braking force
- Field pole is a part to excite B. Armature is a part carrying I (current). (Refer to Figure 1.)
- Gap core (2) is made of ferromagnetic material with a certain thickness. As it is located in the air gap, it is named "Gap core”.
- R Magnetic circuit reluctance in ⁇ (air gap) of the Figure 1
- the electromagnetic braking force is produced by interaction of the exciting magnetic field and the magnetic field which is generated by armature current. That is, the electromagnetic braking force is produced by armature reaction.
- the exciting magnetic field (the magnetic field of field pole (1)) is interacted with the magnetic field which is generated by current (4) in ⁇ 2 (air gap), thereby existing the armature reaction in ⁇ 2 (air gap).
- the electromagnetic braking force is produced in ⁇ 2 (air gap).
- the exciting magnetic field (the magnetic field of field pole(l)) is interacted with the magnetic field which is generated by current(4) in 8x(ak gap) and 8 2 (a gap), thereby the armature reaction exist in 6i(ak gap) and e 2 (air gap).
- the secondary air gap is formed by setting the "Gap Core" on the armature core or field pole.
- Second problem is fixing of the "Gap core” which was inserted in the air gap. It is also tough to fix a "Gap core” mechanically. The inserted gap core was removed frequently by
- the "Virtual air gap” is the narrow and short part of core which is formed by grooving a certain part of field pole (1) or armature core (3).
- the "Virtual air gap (5)" is formed by grooving a certain part of field pole (1).
- the "Virtual air ga (5)" is formed by grooving a certain part of armature core (3).
- the "Virtual air gap (5)" is saturated, the "Virtual air gap” is possessed the characteristic of air gap and operates as secondary air gap. That is,
- Embodiment (1) or armature core (3).
- One 5kW three-phase synchronous generator is excited by using the 8 BP diesel motor.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
This invention relates to a method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator. If a secondary air gap besides the primary one is formed by "Gap core" or "Virtual air gap" in the armature magnetic circuit of the electric generator, the frequency of electric generator is increased and the energy is conserved by weakening the electromagnetic braking force to be exerted on the rotor of electric generator. A core between primary and secondary air gap is named "Gap core". The "virtual air gap" is the short and narrow part of ferromagnetic core which is formed by grooving certain part of armature core or field pole. If the "Virtual air gap" is saturated, it is characteristic of air gap and operates as secondary air gap. The present invention is directed to produce electric power by consuming less energy.
Description
Method for Increasing the Electric Power Output
By Weakening the Electromagnetic Braking Force To Be
Exerted On the Rotor of Electric Generator
Technical Field of the Invention
The invention relates to a method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator.
Background and Purpose of the Invention If the electric generator is loaded, the electric power output as well as the frequency of electric generator is decreased since the electromagnetic braking force is exerted on the rotor of electric generator.
It is well known to increase rotation number of electric generator by supplying more energy to a motor in order to produce the needed frequency and electric power.
The purpose of this invention is to suggest a method for producing the electric power with consuming less energy, by which electromagnetic braking force exerted on the rotor of electric generator is weakened. Explanation of the Drawings
Figure 1 shows producing of electromagnetic braking force in δ (air gap).
Figure 2 shows the dispersion and distribution of electromagnetic braking force.
Figure 3 and 4 are related to proving the Assumption 1 and 3.
Figure 5 and 6 are related to proving the Assumption 2 and 3.
Figure 7 and 8 shows technological structures which are formed ^with "Virtual air gap" to take the "Gap core effect".
Figure 9 shows the practical structure of field pole before introducing "Gap core effect". Figure 10 shows an example forming the "Virtual air gap" in the field pole. The dotted circle part indicates the "Virtual air gap". In the above Figures:
1, 6- Field pole
2- Gap core
3- Armature core
4- Armature conductor
5- Virtual air gap
The slash {II I II) indicates that the upper part and lower part are mechanically fixed at regular interval.
Description of the Invention
The present invention relates to a method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator.
If the electric generator is loaded, the electromagnetic braking force is exerted on the rotor of electric generator.
This electromagnetic braking force is represented as follows:
F = B I L ©
Wherein, F: Electromagnetic braking force
B: Magnetic flux density in the air gap
I: Electric current flowing through conductor
L: Length of conductive wire affected by line of magnetic force
Field pole is a part to excite B. Armature is a part carrying I (current). (Refer to Figure 1.)
As a magnetic field is excited around a conductor carrying current, the relation between current and magnetic field is represented as follows.
I= <D R ©
Wherein, Φ: Magnetic flux to be generated by current
R: Magnetic circuit reluctance in the path of Φ flow
Substituting Formula © for I of Formula ®,
F= B OR L ©
As Figure 1 and 2 show:
"Gap core (2)" is made of ferromagnetic material with a certain thickness. As it is located in the air gap, it is named "Gap core".
Suppose that there is no magnetic reluctance in cores and the magnetic flux of Figure 1 is equal to one of Figure 2, then:
In the figure l, I=O R
In the figure ^ I^ iRi+Rz) ©
F=B OR L=B OR1L+B R2L=F1+F2 (§)
Wherein, R: Magnetic circuit reluctance in δ (air gap) of the Figure 1
Ri: Magnetic circuit reluctance in δι (air gap) of the Figure 2
R2: Magnetic circuit reluctance in δ2 (air gap) of the Figure 2)
Fi, F2: Electromagnetic braking force produced in δι (air gap)
and δ2 (air gap))
Given above facts, it is possible to assume as follows:
Assumption 1: The electromagnetic braking force is produced by interaction of the exciting magnetic field and the magnetic field which is generated by armature current. That is, the electromagnetic braking force is produced by armature reaction.
Assumption 2: If a magnetic circuit is constructed like Figure 2, the electromagnetic braking force (F) is dispersed and distributed to δι (air gap) and δ2 (air gap) as Fi and F2.
Assumption 3: As either of Fi and F2 is absorbed, it is not able to take effect.
Proving for the above assumptions (by experiments):
In Figure 3,
As the magnetic field which is generated by current (4) in δα (air gap) is closed by armature core (3) and "Gap core (2)", this magnetic field doesn't take effect to δι (air gap), thereby there is no armature reaction in δι (air gap).
According to the Assumption 1, no electromagnetic braking force is produced in δχ (air gap). By experiment, it is proved that no force was produced in δι (air gap):
As the magnetic field which is generated by current (4) in δ2 (air gap) is closed by armature core (3) and "Gap core (2)", this magnetic field takes effect to δ2 (air gap), thereby there is the armature reaction in δ2 (air gap).
According to the Assumption 1, the electromagnetic braking force is produced in δ2 (air gap). By experiment, it is proved that no force was produced in δ2 (air gap).
In Figure 4,
The exciting magnetic field (the magnetic field of field pole (1)) is interacted with the magnetic field which is generated by current (4) in δ2 (air gap), thereby existing the armature reaction in δ2 (air gap).
According to the Assumption 1, the electromagnetic braking force is produced in δ2 (air gap). By experiment, it is proved that the force is produced in δ2 (air gap): F2≠0
Analyzing experimental result for Figure 3 and 4, no electromagnetic braking force is produced in δι (air gap); the electromagnetic braking force is produced in δ2 (air gap); and, as the electromagnetic braking force which is produced in δ2 (air gap) of Figure 3 is
absorbed into the mechanical fixing force between "Gap core (2)" and armature core (3), it is not able to take effect.
For these reasons, it is demonstrated that Assumption 1 and 3 are true.
In Figure 5 and 6,
The exciting magnetic field (the magnetic field of field pole(l)) is interacted with the magnetic field which is generated by current(4) in 8x(ak gap) and 82(a gap), thereby the armature reaction exist in 6i(ak gap) and e2(air gap).
According to the Assumption 1, the electromagnetic braking forces are produced in both δι (air gap) and δ2 (air gap). By experiment, it is proved that the forces are produced in both δ2 (air gap) of Figure 5 and δι (air gap) of Figure 6.
Analyzing of experimental result for Figure 5 and 6, the electromagnetic braking force is produced in δι (air gap); the electromagnetic braking force is produced in δ2 (air gap); and, as the electromagnetic braking forces which is produced in δι (air gap) of Figure 5 and δ2
(air gap) of Figure 6 are absorbed into the mechanical fixing force between "Gap core (2)" and armature core (3), they are not able to take effect.
For these reasons, it is demonstrated that Assumption 2 and 3 are true.
Finally, it is demonstrated that if a secondary air gap besides the primary one is formed by "Gap core" in the armature magnetic circuit of electric generator, the electromagnetic braking force which is exerted on the rotor is dispersed and distributed and the either one is not able to take effect because it is absorbed into mechanical fixing force between "Gap core (2)" and armature core (3).
The above phenomenon is named "Gap core effect".
If "Gap core effect" is introduced, the electromagnetic braking force which was exerted on the rotor is reduced as much as the absorbed force, thereby producing the needed electric power wit consuming less energy.
Problems and solutions for introducing "Gap core effect"
1) In case of manufacturing a new electric generator, the secondary air gap is formed by setting the "Gap Core" on the armature core or field pole.
2) In case of introducing "Gap core effect" to old electric generator, the following problems arise:
First problem is inserting a "Gap core". It is rarely possible to insert a "Gap core" in the air gap between field pole and armature core because the distance between field pole and armature core is only several millimeters in a real electric generator.
Second problem is fixing of the "Gap core" which was inserted in the air gap. It is also tough to fix a "Gap core" mechanically. The inserted gap core was removed frequently by
electromagnetic force in some applications.
Solution (introduction of "Virtual air gap"):
A technological structure solving the above mentioned problems is shown in Figure 7 and 8.
The "Virtual air gap" is the narrow and short part of core which is formed by grooving a certain part of field pole (1) or armature core (3).
In Figure 7, the "Virtual air gap (5)" is formed by grooving a certain part of field pole (1).
In Figure 8, the "Virtual air ga (5)" is formed by grooving a certain part of armature core (3).
If the electric generator is loaded and the "Virtual air gap (5)" is saturated, the "Virtual air gap" is possessed the characteristic of air gap and operates as secondary air gap. That is,
"virtual air gap" is formed to take "Gap core effect"
By "Virtual air gap (5)", the "Gap core (2)" and the secondary air gap are formed. It is no problem to fix the "Gap core (2)" mechanically since "Gap core (2)" is integrated with field pole
(1) or armature core (3). Embodiment: One 8 IP diesel motor and two 5kW three-phase synchronous generators are equipped for testing out the "Gap core effect". The"Virtual air gap" was formed in either generator. The load is 3kW three-phase electric heater.
One 5kW three-phase synchronous generator is excited by using the 8 BP diesel motor.
Another one having "Virtual air gap" is also excited by using the 8 IP diesel motor.
The Tablel and Table 2 show the testing results.
fable 1. Testing resuli t for "Gap core effect"
Voltage Current Frequency Output Power factor
Item
(V) (A) (Hz) (kW) (cost ))
Before introduction of
380 5 44 3.3 1
"Gap core effect"
After introduction of
433 5.1 53 3.9 1
"Gap core effect"
Increment 53 0.1 9 0.6 0
Table 2.Testin result of diesel fuel consum tion for 3Kw loadin
As the Table 1 and 2 shows, the frequency and electric power output is increased and the energy consumption is decreased in case of applying the "Gap core effect" to an electric generator.
The above results demonstrate that if a secondary air gap is formed in the armature magnetic circuit, the electromagnetic braking force is weakened to increase electric power output and conserve the energy.
Claims
1. The method of forming the secondary air gap in armature magnetic circuit of electric generator by gap core in order to increase the electric power output and conserve the energy by weakening the electromagnetic braking force, is characterized in that the gap core is fixed on field pole or armature core with regular intervals. Wherein, the air gaps which are separated by the gap core are located in the armature magnetic circuit; the electromagnetic braking force is dispersed and distributed to the above mentioned air gaps; and as the electromagnetic braking force distributed to the part in which the gap core is fixed with field pole or armature core (or in which the secondary air gap is formed) is absorbed, it doesn't exert on the rotor of electric generator.
2. The method for forming the secondary air gap in armature magnetic circuit of electric generator by virtual air gap in order to increase the electric power output and conserve the energy by weakening the electromagnetic braking force, is characterized in that the virtual air gap is formed in a certain part of field pole or armature core. In case of forming the virtual air gap in the field pole, the virtual air gap is the narrow and short part of core which is formed by grooving a certain part of field pole toward armature core and the virtual air gap is possessed the characteristic of air gap and operates as secondary air gap since it is saturated. In case of forming the virtual air gap in the armature core, the virtual air gap is the narrow and short part of core which is formed by grooving a certain part of armature core toward field pole and the virtual air gap is possessed the characteristic of air gap and operates as secondary air gap since it is saturated; and as the electromagnetic braking force distributed to the part of field pole or armature core in which the virtual air gap is formed (or in which the secondary air gap is formed) is absorbed, it doesn't exert on the rotor of electric generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201790001338.6U CN209709764U (en) | 2016-10-18 | 2017-10-18 | A kind of structure weakening the electromagnetic system power that generator amature is subject to |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KP201620004782 | 2016-10-18 | ||
| KP201620004782 | 2016-10-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2018105754A2 true WO2018105754A2 (en) | 2018-06-14 |
| WO2018105754A3 WO2018105754A3 (en) | 2018-08-23 |
Family
ID=62488938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KP2017/000045 Ceased WO2018105754A2 (en) | 2016-10-18 | 2017-10-18 | Method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN209709764U (en) |
| WO (1) | WO2018105754A2 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3610479A1 (en) * | 1986-03-27 | 1987-10-01 | Vacuumschmelze Gmbh | MAGNETIC TRAVEL SENSOR |
| CN101488678A (en) * | 2009-02-27 | 2009-07-22 | 环一军 | Method for reducing positioning torque of stator permanent magnetic type electric machine based on rotor auxiliary slot |
| JP2012100518A (en) * | 2010-10-08 | 2012-05-24 | Denso Corp | Rotary electric machine |
| CN202405989U (en) * | 2012-01-17 | 2012-08-29 | 东南大学 | Low speed large torque permanent magnet cursor straight line wave-activated generator |
| CN103490575B (en) * | 2013-10-17 | 2016-03-30 | 东南大学 | Multiple tooth mixing exciter panel type wind-driven generator |
| CN104201848B (en) * | 2014-07-04 | 2017-06-06 | 东南大学 | A kind of double-stator permanent magnet vernier wind-driven generator |
-
2017
- 2017-10-18 WO PCT/KP2017/000045 patent/WO2018105754A2/en not_active Ceased
- 2017-10-18 CN CN201790001338.6U patent/CN209709764U/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN209709764U (en) | 2019-11-29 |
| WO2018105754A3 (en) | 2018-08-23 |
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