WO2017091873A1 - Excitation system for a synchronous rotating electric machine - Google Patents
Excitation system for a synchronous rotating electric machine Download PDFInfo
- Publication number
- WO2017091873A1 WO2017091873A1 PCT/BR2015/050232 BR2015050232W WO2017091873A1 WO 2017091873 A1 WO2017091873 A1 WO 2017091873A1 BR 2015050232 W BR2015050232 W BR 2015050232W WO 2017091873 A1 WO2017091873 A1 WO 2017091873A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- excitation system
- diode wheel
- exciter
- centrifugal fan
- fan
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/38—Structural association of synchronous generators with exciting machines
Definitions
- the present invention relates to an excitation system for a synchronous rotating electric machine, and more specifically to an excitation system of the type comprising a main exciter, a rectifier bridge and a dedicated fan.
- Synchronous rotating electric machines need a current source to power the rotor winding. This is usually done through an excitation system.
- the brushless system comprises a component called three-phase main exciter (also called EPT) consisting of a static part where the field is located and a rotating component, called armature, which is attached to the axis of the main electric machine and whose terminals generate the output voltage.
- EPT three-phase main exciter
- armature rotating component
- the main exciter's armor provides an alternating type electric current.
- the main electric machine rotor must be powered with direct current.
- a rectifier bridge called the diode wheel, is used which converts the alternating current from the main exciter into a continuous competitor for the main electric machine rotor.
- a voltage regulator which controls the field voltage of the main exciter.
- This voltage regulator can be powered by the mains or be totally independent this one.
- an additional component called a permanent magnet generator (PMG), also known as an auxiliary exciter, is used.
- PMG permanent magnet generator
- the permanent magnet generator has its rotor connected to the main electrical machine shaft and supplies power to the voltage regulator.
- the above components which were the excitation system of a brushless type synchronous machine, have functions for generating or converting electricity.
- a known solution is the use of fans already in the electric machine. This solution is applicable when the excitation system is located inside the electrical machine enclosure or in a separate enclosure but connected through air inlet and outlet openings to the ventilators of the electrical machine. Thus, in this solution, the electric machine's own fans provide the generation of air flow necessary for the cooling of the excitation system components.
- Another known solution is the use of dedicated flow generation fans for cooling the excitation system components.
- a dedicated additional fan is provided, and the excitation system is generally located in a separate housing from the electrical machine housing.
- the dedicated fan is a centrifugal fan located at the front end and or rear end of the enclosure. of the excitation system, which aspirates the air flow that flows through the excitation system components.
- US 5,998,893 shows a solution where the heatsink and rectifier bridge are formed into an integral assembly.
- the assembly comprises a disc having a central hole which is aligned with the rotor hole of the electric machine and bolted to the rotor.
- a plurality of fan blades are disposed on the outer periphery of the disk forming the fan, and grinding units which are arranged in recesses of the disks.
- CN 202334217 describes a brushless drive device comprising a rectifier ring made of high quality alloy steel and a fan provided on the outside of the rectifier ring.
- the interior of the ring has a radiator duct and the inner side of the ring is provided with a three phase bridge type rectified circuit.
- the present invention achieves the above objectives by means of an excitation system comprising a main exciter with an exciter armature and an exciter field, the main exciter generating an alternating current; a diode wheel for converting alternating current to direct current; and a centrifugal fan for cooling the excitation system.
- the centrifugal fan is concentrically mounted on the diode wheel in a removable socket configuration.
- the diode wheel has an outer circular rim defining an outer surface and the removable fitting of the centrifugal fan is realized by interference on such an outer surface of the diode wheel.
- the removable fitting of the centrifugal fan is performed with a loose fit and the fan is fixed to the diode wheel by means of screws.
- the excitation system further comprises an auxiliary exciter having a rotor part and a static part.
- FIG. 1 is an exploded perspective view of the excitation system according to a first embodiment of the present invention
- Figure 2 is a schematic partial sectional view of the excitation system according to a preferred embodiment of the present invention showing the direction of air flow during aspiration of the exhalation system air flow;
- FIG. 3 is a schematic partial cross-sectional view of the excitation system according to a preferred embodiment of the present invention showing the direction of air flow during air flow insufflation of the excitation system;
- FIG. 4 is a perspective and cross-sectional view of a second embodiment of the present invention.
- Figure 1 shows an exploded view of a first embodiment of the synchronous rotating electric machine excitation system of the present invention.
- the main exciter comprises an exciter armature 1, which is a rotary component, and an exciter field 2, which is a static component.
- Exciter field 2 feeds the electric machine (not shown) through a rectifier bridge or diode wheel 3.
- Diode wheel 3 converts alternating current from the main exciter to direct current for power to the electrical machine.
- the system of the present invention further includes a dedicated fan 4 for cooling the excitation system.
- fan 4 is a centrifugal fan mounted externally to the diode wheel 3.
- the centrifugal fan is concentrically mounted on the diode wheel, with a removable socket configuration.
- the diode wheel has an outer circular rim defining an outer surface 3a.
- the fan 4 is mounted concentrically and by interference on the outer surface 3a of the diode wheel.
- the centrifugal fan 4 is mounted concentrically and by slack adjustment on the outer surface 3a of the diode wheel 3, and fixed to the wheel by screws 7.
- the diode wheel 3 has screw receiving holes 3b 7.
- the fan 4 has a circular flat flap 4a which is overlapped, with clearance, on the outer surface 3a of the diode wheel 3, and holes 4b corresponding to the holes 3b of the diode wheel 3 for receiving the screws 7.
- centrifugal fan 4 of the present invention is an independent part of the diode wheel 3 and can be easily separated / removed from it when desired.
- the fact that the fan 4 is a separate part of the diode wheel 3 allows the static components of the excitation system to be easily removed after the fan 4 is removed.
- the solution proposed by the present invention enables a easy maintenance and replacement of components, saving time and cost.
- Figure 2 shows the flow of air flow from the excitation system when
- FIG. 3 shows the air flow of the excitation system when the ventilator is activated for insufflation.
- the excitation system further comprises an auxiliary exciter which provides power to the main exciter voltage regulator.
- the auxiliary exciter in the embodiment shown is a permanent magnet generator and has a rotor part 5 and a static part 6.
- the auxiliary exciter rotor 5 is connected to the electrical machine shaft (not shown).
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BR2015/050232 WO2017091873A1 (en) | 2015-12-03 | 2015-12-03 | Excitation system for a synchronous rotating electric machine |
BR112018011219-4A BR112018011219B1 (en) | 2015-12-03 | 2015-12-03 | EXCITEMENT SYSTEM FOR A SYNCHRONOUS ROTATING ELECTRICAL MACHINE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BR2015/050232 WO2017091873A1 (en) | 2015-12-03 | 2015-12-03 | Excitation system for a synchronous rotating electric machine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017091873A1 true WO2017091873A1 (en) | 2017-06-08 |
Family
ID=58796015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2015/050232 WO2017091873A1 (en) | 2015-12-03 | 2015-12-03 | Excitation system for a synchronous rotating electric machine |
Country Status (2)
Country | Link |
---|---|
BR (1) | BR112018011219B1 (en) |
WO (1) | WO2017091873A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1137937A (en) * | 1965-04-05 | 1968-12-27 | Elektro Bau Ag | Improvements in or relating to synchronous generators |
US5998893A (en) * | 1998-12-03 | 1999-12-07 | Emerson Electric Co | Integral heat sink and fan rectifier assembly |
CN202334217U (en) * | 2011-12-07 | 2012-07-11 | 山东齐鲁电机制造有限公司 | High-rotation-speed brushless exciter rectifying device |
DE102012110928A1 (en) * | 2011-11-17 | 2013-05-23 | Denso Corporation | Alternating current generator for vehicle, allows cooling air to flow along ribs from radially outer to inner sides of rectifier cell when fan rotates, and in air flow space formed on radially inner side of ribs in direction of fan |
-
2015
- 2015-12-03 WO PCT/BR2015/050232 patent/WO2017091873A1/en active Application Filing
- 2015-12-03 BR BR112018011219-4A patent/BR112018011219B1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1137937A (en) * | 1965-04-05 | 1968-12-27 | Elektro Bau Ag | Improvements in or relating to synchronous generators |
US5998893A (en) * | 1998-12-03 | 1999-12-07 | Emerson Electric Co | Integral heat sink and fan rectifier assembly |
DE102012110928A1 (en) * | 2011-11-17 | 2013-05-23 | Denso Corporation | Alternating current generator for vehicle, allows cooling air to flow along ribs from radially outer to inner sides of rectifier cell when fan rotates, and in air flow space formed on radially inner side of ribs in direction of fan |
CN202334217U (en) * | 2011-12-07 | 2012-07-11 | 山东齐鲁电机制造有限公司 | High-rotation-speed brushless exciter rectifying device |
Also Published As
Publication number | Publication date |
---|---|
BR112018011219B1 (en) | 2022-07-05 |
BR112018011219A2 (en) | 2018-11-21 |
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