EP2777138A2 - Low speed electric generator - Google Patents

Low speed electric generator

Info

Publication number
EP2777138A2
EP2777138A2 EP12755929.2A EP12755929A EP2777138A2 EP 2777138 A2 EP2777138 A2 EP 2777138A2 EP 12755929 A EP12755929 A EP 12755929A EP 2777138 A2 EP2777138 A2 EP 2777138A2
Authority
EP
European Patent Office
Prior art keywords
core
rotor
low speed
electric generator
speed electric
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.)
Withdrawn
Application number
EP12755929.2A
Other languages
German (de)
French (fr)
Inventor
Dan CAMPEANU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BULTOC, CALIN
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2777138A2 publication Critical patent/EP2777138A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/0094—Structural association with other electrical or electronic devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/42—Asynchronous induction generators
    • H02K17/44—Structural association with exciting machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H02K19/26—Synchronous generators characterised by the arrangement of exciting windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H02K19/26—Synchronous generators characterised by the arrangement of exciting windings
    • H02K19/32—Synchronous generators characterised by the arrangement of exciting windings for pole-changing

Definitions

  • the invention refers to a generator which produces electric energy at a speed of 30 rot/min ; said generator being meant to be mounted on modular hydrokinetic assemblies, for exploiting the energetic potential of rivers in the plain regions, where the relief does not allow building classical hydro-energetic arrangements, such as dams or culverts.
  • the problem that the invention seeks to solve consists in providing an electric generator that produces electric energy at a speed of 30 rot/min and has an optimum diameter for being mounted on modular hydrokinetic assemblies, as the number of poles depends solely on the number of electrical network phases whereto said generator is connected, and said rotor windings are fed from a source in commutation by means of a collector which has no physical contact, said source providing a frequency independent upon the number of poles and upon the rotor speed.
  • the low speed electric generator according to the invention presents a series of other advantages that are essential for exploiting the energetic potential of plain rivers: as the axle rotation is slow, the attrition in the rotor bearings is reduced at a minimum, thus providing a long period of uninterrupted functioning; by using a collector without a physical contact between the components, the attrition is eliminated and a practically unlimited time functioning of the collector is ensured; - by the perfect insulation of the collector, the possibility of electric energy leakage in aquatic environment, specific to the generator, is excluded; the ability of producing electric energy at low speed eliminates the necessity of integrating, in the kinematic chain of converting mechanical energy into electrical energy, of a speed multiplier, thus reducing the manufacturing cost of the entire assembly.
  • Fig. 1 a longitudinal section in the generator assembly
  • Fig. 2 a block diagram of the excitation current supply source.
  • the low speed electric generator comprises a housing (1) wherein stator winding cores (2) are mounted, said housing (1) being closed at the ends with shields (3] provided with bearings (4) which allow the rotation of an axle (5) whereon rotor winding cores (6) are mounted, said rotor winding cores (6) being supplied by means of an inductive collector (7) from a source [8] which produces an excitation current with alternative and intermittent polarity.
  • the inductive collector (7) consists of a fixed primary winding (9] comprised in a fixed casing (10) integral with the shield (3), and a mobile secondary winding (11) comprised in the mobile housing (12), integral with the axle (5).
  • the source (8) consists of an adjustable impulse forming circuit (13), connected by means of a delaying circuit (14) to a polarity alternating circuit (15) that supplies the rotor windings with a current supplied by a rectifier (16).
  • the polarity alternating current (15) is connected to the lugs (a) and (b) of the fixed primary winding by means of conductors (17) and the current is transmitted to the mobile secondary winding (11) by electromagnetic induction created in the magnetic field formed by the fixed core (18) and the mobile core (19), circuit that closes by means of the fixed casing (10) integral with the shield (3) and the mobile housing (12) integral with the axle (5), and the excitation current induced in the mobile secondary winding (11) reaches the rotor windings (6) by means of conductors (20).
  • said cores In order to increase the transfer surface of the magnetic field flux between the fixed core (18) and the mobile core (19), said cores have tapered conjugated facets (A).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The invention refers to a low speed electric generator, The generator according to the invention comprises a housing (1] wherein stator winding cores (2) are mounted, said housing (1] being closed at the ends with shields (3) provided with bearings (4) which allow the rotation of an axle (5) whereon rotor winding cores (6) are mounted, said rotor winding cores (6) being supplied by means of an inductive collector (7) from a source (8) which produces an excitation current with alternative and intermittent polarity; the inductive collector (7) consists of a fixed primary winding (9) comprised in a fixed casing (10) integral with the shield (3], and a mobile secondary winding (11) comprised in the mobile housing (12), integral with the axle (5).

Description

LOW SPEED ELECTRIC GENERATOR
The invention refers to a generator which produces electric energy at a speed of 30 rot/min; said generator being meant to be mounted on modular hydrokinetic assemblies, for exploiting the energetic potential of rivers in the plain regions, where the relief does not allow building classical hydro-energetic arrangements, such as dams or culverts.
It is known that the electromotive force e0 that appears at the lugs of a stator winding when this is circulated through by the magnetic field flux ( max produced by the rotor windings, depends on the frequency ω and the number of spires of the winding Nsp: wherein (pmax and Nsp result from calculation and have constructive limits, and the frequency ω results from the number of poles of the rotor and from its speed, as an expression of the frequency at which the magnetic field flux produced by the rotor windings reverses its direction in a stator winding and thus, the increase of capacity in a low speed generator is ultimately carried out by increasing the diameter of the generator. Yet, a generator with a large diameter presents the drawback that it cannot be used to fit modular hydrokinetic assemblies.
The problem that the invention seeks to solve consists in providing an electric generator that produces electric energy at a speed of 30 rot/min and has an optimum diameter for being mounted on modular hydrokinetic assemblies, as the number of poles depends solely on the number of electrical network phases whereto said generator is connected, and said rotor windings are fed from a source in commutation by means of a collector which has no physical contact, said source providing a frequency independent upon the number of poles and upon the rotor speed.
The low speed electric generator according to the invention presents a series of other advantages that are essential for exploiting the energetic potential of plain rivers: as the axle rotation is slow, the attrition in the rotor bearings is reduced at a minimum, thus providing a long period of uninterrupted functioning; by using a collector without a physical contact between the components, the attrition is eliminated and a practically unlimited time functioning of the collector is ensured; - by the perfect insulation of the collector, the possibility of electric energy leakage in aquatic environment, specific to the generator, is excluded; the ability of producing electric energy at low speed eliminates the necessity of integrating, in the kinematic chain of converting mechanical energy into electrical energy, of a speed multiplier, thus reducing the manufacturing cost of the entire assembly.
An embodiment example of the invention is given below, in relation with Figs. 1 and 2, representing:
Fig. 1, a longitudinal section in the generator assembly;
Fig. 2, a block diagram of the excitation current supply source.
According to the invention, the low speed electric generator comprises a housing (1) wherein stator winding cores (2) are mounted, said housing (1) being closed at the ends with shields (3] provided with bearings (4) which allow the rotation of an axle (5) whereon rotor winding cores (6) are mounted, said rotor winding cores (6) being supplied by means of an inductive collector (7) from a source [8] which produces an excitation current with alternative and intermittent polarity.
The inductive collector (7) consists of a fixed primary winding (9] comprised in a fixed casing (10) integral with the shield (3), and a mobile secondary winding (11) comprised in the mobile housing (12), integral with the axle (5).
The source (8) consists of an adjustable impulse forming circuit (13), connected by means of a delaying circuit (14) to a polarity alternating circuit (15) that supplies the rotor windings with a current supplied by a rectifier (16).
The polarity alternating current (15) is connected to the lugs (a) and (b) of the fixed primary winding by means of conductors (17) and the current is transmitted to the mobile secondary winding (11) by electromagnetic induction created in the magnetic field formed by the fixed core (18) and the mobile core (19), circuit that closes by means of the fixed casing (10) integral with the shield (3) and the mobile housing (12) integral with the axle (5), and the excitation current induced in the mobile secondary winding (11) reaches the rotor windings (6) by means of conductors (20).
In order to increase the transfer surface of the magnetic field flux between the fixed core (18) and the mobile core (19), said cores have tapered conjugated facets (A).

Claims

1. Low speed electric generator characterized in that, it comprises a housing (1) wherein stator winding cores (2) are mounted, said housing (1) being closed at the ends with shields (3) provided with bearings (4) which allow the rotation of an axle (5) whereon rotor winding cores (6) are mounted, said rotor winding cores (6) being supplied by means of an inductive collector (7) from a source (8) which produces an excitation current with alternative and intermittent polarity.
2. Low speed electric generator according to claim 1, characterized in that, the inductive collector (7) consists of a fixed primary winding (9) comprised in a fixed casing (10) integral with the shield (3), and a mobile secondary winding (11) comprised in the mobile housing (12), integral with the axle (5).
3. Low speed electric generator according to claim 1, characterized in that, the source (8) consists of an adjustable impulse forming circuit (13), connected by means of a delaying circuit (14) to a polarity alternating circuit (15) that supplies the rotor windings with a current supplied by a rectifier (16).
4. Low speed electric generator according to claims 1 to 3, characterized in that, the rotor windings are supplied through the lugs (a) and (b) from the source (8), by means of the inductive collector (7), wherein the electromagnetic induction is transmitted from the fixed primary winding (9) to the mobile secondary winding (11) by the magnetic circuit formed by the fixed core (18) and the mobile core (19), circuit that closes by means of the fixed casing (10) integral with the shield (3) and the mobile housing (12) integral with the axle (5), and the excitation current induced in the mobile secondary winding (11) reaches the rotor windings (6) by means of conductors (20).
5. Low speed electric generator according to claim 4, characterized in that, in order to increase the transfer surface of the magnetic field flux between the fixed core (18) and the mobile core (19), said cores have tapered conjugated facets (A).
6. Low speed electric generator according to claims 1 to 4, characterized in that, between two direction reversals of the excitation current, the delaying circuit (14) cuts the supply of the rotor windings upon the command of the adjustable impulse forming circuit (13), in order to protect the components of the commutation circuit (15).
7. Low speed electric generator according to claim 5, characterized in that, during the movement of a rotor winding core over a stator winding core, the excitation current reverses its direction at a frequency determined by means of the adjustable impulse forming circuit (13) and produces the reversal of direction of the magnetic field flux in the rotor core and, implicitly, in the stator core, thus determining the occurrence in the stator core of a frequency ω that does not depend on the speed of the rotor core over the stator core and, during the entire period wherein the excitation current has a certain polarity, in the gap between the rotor core and the stator core a spinning magnetic field occurs, producing an electromotive force in the stator winding having the frequency resulted from the relative rotation movement between said cores, under the action of the mechanical force that drives the rotor.
EP12755929.2A 2011-06-03 2012-06-05 Low speed electric generator Withdrawn EP2777138A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ROA201100534A RO126983A0 (en) 2011-06-03 2011-06-03 ELECTRIC TRAIN GENERATOR
PCT/RO2012/000015 WO2012165989A2 (en) 2011-06-03 2012-06-05 Low speed electric generator

Publications (1)

Publication Number Publication Date
EP2777138A2 true EP2777138A2 (en) 2014-09-17

Family

ID=45374022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12755929.2A Withdrawn EP2777138A2 (en) 2011-06-03 2012-06-05 Low speed electric generator

Country Status (3)

Country Link
EP (1) EP2777138A2 (en)
RO (1) RO126983A0 (en)
WO (1) WO2012165989A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2697506C1 (en) * 2018-11-01 2019-08-15 федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" Electric generating device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663945A (en) * 1970-09-04 1972-05-16 Univ Oklahoma State Apparatus for providing ac electrical energy at a preselected frequency
SE512721C2 (en) * 1997-09-30 2000-05-02 Abb Ab Rotary electric machine, machine comprising at least one rotating electric main machine and electric power plant comprising a rotating electric machine and method for magnetizing a rotating electric machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012165989A2 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2697506C1 (en) * 2018-11-01 2019-08-15 федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" Electric generating device

Also Published As

Publication number Publication date
WO2012165989A3 (en) 2014-06-12
RO126983A0 (en) 2011-12-30
WO2012165989A2 (en) 2012-12-06

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