WO2003019755A1 - Electrical machines with two rotating magnetic fields - Google Patents

Electrical machines with two rotating magnetic fields Download PDF

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Publication number
WO2003019755A1
WO2003019755A1 PCT/HR2002/000028 HR0200028W WO03019755A1 WO 2003019755 A1 WO2003019755 A1 WO 2003019755A1 HR 0200028 W HR0200028 W HR 0200028W WO 03019755 A1 WO03019755 A1 WO 03019755A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
rmf
stator
machines
rotational speed
Prior art date
Application number
PCT/HR2002/000028
Other languages
French (fr)
Inventor
Ivica Samardžić
Original Assignee
Samardzic Ivica
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 Samardzic Ivica filed Critical Samardzic Ivica
Publication of WO2003019755A1 publication Critical patent/WO2003019755A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/02—Machines with one stator and two or more rotors
    • H02K16/025—Machines with one stator and two or more rotors with rotors and moving stators connected in a cascade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • This invention represents a new idea of electrical machines which have two rotating magnetic fields flowing through three mutual rotating parts of machine:one stator and two rotors.
  • the goal of this invention is reduction of imperfection of existing RMF machines by:
  • Resultant rotation of R2 is achieved by rotors revolution summing: two rotation in the same direction or two rotation in opposite direction, that can be synchronous or asynchronous.
  • double RMF machine In relation to axis of rotation double RMF machine can be designed in two ways:
  • Double speed of RMF on R2 can be achieved if winding on stator drives, synchron or asynchron, R1 that carries winding which, with rotation in the same direction, drives.synchron or asynchron, R2. That way designed machine would not achieve desirable increase of its specific power (W/kg). R1 would have two separated magnetic circuits.Two separated RMF-s would be flowing through that machine, with its own (independent) magnetic conductors.
  • Solution is if by each part of machine flows through only one magnetic flux. This can be achieved if S and R2 carries windings that creates RMF-s, and, R1 winding that couples this two RMF-s, synchron or asynchron. In that case one magnetic flux flows through from S to R2 through two air slits and R1. RMF-s of S and R2 can be in the same or opposite direction, so the resultant rotational velocity of R2 can be zero or double . If RMF-s of S and R2 effects R1 trying to rotate it in opposite directions resultant rotational velocity of R2 is double.
  • R1 M f(n) of rotor 1
  • R2 M f(n) of rotor 2 n R ⁇ working point of R1 n R2 working point of R2, summarized, relativ to S.
  • Embodiment of the invention is possible with technologies and materials that are on disposal for construction of similar,exsisting RMF machines.
  • New in embodiment is indispensability of double bearing: R1 on S and R2 on R1 , or , R1 in S and R2 in R1.
  • Electrical machine with winding that creates RMF on R1 (shoved in drawing 2) is simplest to produce.ln this way of embodiment of invention , the outside S is carrying cage-winding that is adapted to necessities of driving conditions.
  • asynchronous driven R1 that is carrying threephase winding that produces RMF is conected on electrical network through slide-rings.
  • cage-winding on R2 is asynchronous driven by RMF of R1.
  • Observing from R1 ,that RMF of R1 is driving coupled cage-windings of S and R2 into the same direction. Only consumable part of machine is electromechanical slip-rings transfer of electrical energy on R1 winding.
  • Electrical machines with two RMF-s can be applied as motors and as generators.
  • driving machines because of near double increase of specific power and double increase of rotation velocity, related to existing RMF machines, they are entering into the exclusive application area of collector machines, bringing reliability and robustness.
  • generators As a generators they are entering into tha area of double and into the area of zero rotation velocity , that are unaccessible to RMF generators of todays state of art.

Abstract

Electrical machines with two rotational magnetic field (RMF) have three fundamental elements: stator (S), rotor 1 (R1) and rotor 2 (R2). RMF flow between S and R1 also R1 and R2. RMF is created by coils on S and R2 or a coil on R1. At first case R1 is following RMF synchronously or asynchronously and R2 can have double rotational speed of RMF or zero rotational speed, rest. At another case S and R2 in relation to R1 rotate in identical direction, synchronously or asynchronously, or one synchronously another asynchronously. By reason of increase of specific powder, double increase of rotational speed and zero rotational speed, these electrical machines can be used: for direct drive of machines with large rotational speed, as drive machines in small portable devices, as generators driven by high-speed rotating turbines, as asynchronous generators (direct) driven by low-speed rotating (wind) turbines.

Description

ELECTRICAL MACHINES WITH TWO ROTATING MAGNETIC FIELDS
DESCRIPTION OF INVENTION
Field of invention
This invention represents a new idea of electrical machines which have two rotating magnetic fields flowing through three mutual rotating parts of machine:one stator and two rotors.
Technical problem
Electrical machines with rotating magnetic fields,as they are made today.have many limitations.considering production and consumption of electric power.
Only, with reduction gear between generator and propeller (wind turbine) it is possible, in todays wind power plants.to produce electric energy.
Small electric machines with rotating magnetic fields are not used for most mobile devices because of their little specific power (W/kg) although they are much more reliable and durable then collector electric machines.
State of the art
Electrical machines using rotating magnetic fields (RMF) today have one rotor and one stator, one RMF flowing through between them. Existing construction solutions of these machines and characteristics of networks they are being supplied with, define their dinamic characteristics, their usage limitations. Restricting factor of their usage is not only little specific power but also impossibility of quality regulation of rotational velocity. Usual methods of regulation of rotational velocity are:
- changing number of poles that make RMF, that gaines step regulation,
- changing frequency of electrical network, that effects continued regulation, with high cost of system, less reliability and more energy disipation,
- changing impedance of rotor winding, that effects continued regulation with huge energy dissipation.
Invention essence explication
The goal of this invention is reduction of imperfection of existing RMF machines by:
- increasing of specific power and
- improving of external characteristics, so that these machines would expand and simplify their usage.
Electrical machines with two RMF-s have stator (S) and two rotors (R1 and R2).They can carry one winding ,on R1 , or two windings ,on S and R2, that creates RMF-s that are coupled .consistently, with two ,on S and R2, or one ,on R1 , windings that creates invariably magnetic field (that can be permanent magnet too) or .induced by sliding.variable magnetic field.
Resultant rotation of R2 , with rotational velocity between zero and double synchronous, is achieved by rotors revolution summing: two rotation in the same direction or two rotation in opposite direction, that can be synchronous or asynchronous.
In relation to axis of rotation double RMF machine can be designed in two ways:
- stator externally and rotors inside stator (one rotor inside other) or - stator inside and two rotors externaly (one around other) as it is shown in drawings 1 and 2. Double speed of RMF on R2 can be achieved if winding on stator drives, synchron or asynchron, R1 that carries winding which, with rotation in the same direction, drives.synchron or asynchron, R2. That way designed machine would not achieve desirable increase of its specific power (W/kg). R1 would have two separated magnetic circuits.Two separated RMF-s would be flowing through that machine, with its own (independent) magnetic conductors.
Solution is if by each part of machine flows through only one magnetic flux. This can be achieved if S and R2 carries windings that creates RMF-s, and, R1 winding that couples this two RMF-s, synchron or asynchron. In that case one magnetic flux flows through from S to R2 through two air slits and R1. RMF-s of S and R2 can be in the same or opposite direction, so the resultant rotational velocity of R2 can be zero or double . If RMF-s of S and R2 effects R1 trying to rotate it in opposite directions resultant rotational velocity of R2 is double.
Special case is when winding which produces RMF is placed on R1. Magnetic fields of S and R2, coupled with RMF of R1 , can connect them mechanicaly so that relative revolution of S towards R1 , and, R2 towards R1 can be both synchronous or asynchronous, or, one synchronous other asynchronous.
As in all cases revolutions of S and R2 in relation to R1 are in the same direction, that is R1 towards S rotates opposite then R2 towards R1 , resultant revolution of R2 is zero, it is in rest, (drawing 2)
External characteristics, M = f(n), when R2 rotational velocities are zero and double, realized by composing two partial asynchronous external characteristics, represents remarkable property of machines with two RMF-s. ( drawing 3 ) At first case when R2 rotational velocity becomes double of R1 (e.g. 5800 r/min) specific power becomes almost double. At second case, when R2 rotational velocity is zero, R2 in rest, the machine is valueless as working machine but becomes new value as generator: possibility of direct connection to wind turbine - propeller, without reduction gear.
At external characteristic ( drawing 4 ) when R2 rotational velocity is zero, composed of two asynchronous external characteristics, is represented working point of such one machine, asynchronous generator directly driven by wind turbine. By means of modifying partial asynchronous characteristic.parts of total external characteristic, is possible such one generator adjust to wind turbine.Although part of this generator is working in motor field, R1 towards S, all together, more energy is going into the electrical network: with the same moment R2 is revolving faster then R1.
Short drawings description
Drawing 1
Cross-sections of two variant of electrical machines with two RMF-s and two windings that produces RMF-s. a stator outside b stator inside
S stator
R1 rotor 1
R2 rotor 2
NOMP winding that produces RMF
Drawing 2
Cross-sections of two variant of electrical machines with two RMF-s and one winding that produces RMF-s. Meaning of designation as at picture 1. Drawing 3
External characteristics, M = f(n), of electrical machines with two RMF-s , obtained by supperposition of two asynchronous external characteristics a added asynchronous external characteristics of R1 and R2 b subtracted asynchronous external characteristic of R1 and R2 n rotational velocity
M moment
R1 M = f(n) of rotor 1
R2 M = f(n) of rotor 2 nRι working point of R1 nR2 working point of R2, summarized, relativ to S.
ΠSRI synchronous rotational velocity of R1 nSR2 synchronous rotational velocity of R2 nS(Ri+R2) double synchronous rotational velocity
Drawing 4
External characteristic of electric machine with two RMF-s and zero rotational velocity of R2 , with working point of R1 and R2 , at direct connection between windturbine and R2.
M1 moment on R1
M2 moment on R2 ni rotational velocity of R1 , relativ to S n2 rotational velocity of R2, relativ to R1
R1 external characteristic of R1 , relativ to S
R2 external characteristic of R2, relativ to R1 n0 zero rotational velocity of R2, rest. Detailed description of one .preffered embodiment of the invention
Embodiment of the invention is possible with technologies and materials that are on disposal for construction of similar,exsisting RMF machines. New in embodiment is indispensability of double bearing: R1 on S and R2 on R1 , or , R1 in S and R2 in R1. Electrical machine with winding that creates RMF on R1 (shoved in drawing 2) is simplest to produce.ln this way of embodiment of invention , the outside S is carrying cage-winding that is adapted to necessities of driving conditions. In relation to S, asynchronous driven R1 ,that is carrying threephase winding that produces RMF is conected on electrical network through slide-rings. In this way, to works conditions adapted, cage-winding on R2 is asynchronous driven by RMF of R1. Observing from R1 ,that RMF of R1 is driving coupled cage-windings of S and R2 into the same direction. Only consumable part of machine is electromechanical slip-rings transfer of electrical energy on R1 winding.
Invention application way
Electrical machines with two RMF-s can be applied as motors and as generators. As driving machines , because of near double increase of specific power and double increase of rotation velocity, related to existing RMF machines, they are entering into the exclusive application area of collector machines, bringing reliability and robustness. As a generators they are entering into tha area of double and into the area of zero rotation velocity , that are unaccessible to RMF generators of todays state of art.
In this way they are offering essentialy new possibilities.
In first case it is possible to apply, as a drive machine.directly coupled turbines with double rotational velocity (that lead to miniaturisation).
In second case it is possible to apply, as a drive machine in the wind power stations,directly coupled slow-rotational wind turbines, propellers.

Claims

Claims
1. Electrical machine with rotational magnetic field characterized in this way that it has three elements: stator, rotor 1 and rotor2, that can be .related to rotation axis, arranged from outside toward rotation axis, in series as it is specified, or reverse, that it has two rotational magnetic fields that flows through two air slits between stator and rotorl , and, rotor 1 and rotor 2.
2. Electrical machine like in requirement 1 .characterized in this way: that two windings, one on stator and other on rotor2, or only one winding on rotor 1 , can build two rotational magnetic field.
3. Electrical machine like in requirement 1 and 2, characterized in this way: that in case when windings that produces rotational magnetic fields are located on stator and rotor 2 , rotor 1 has magnetic field that couples it mechanicaly with stator and rotor 2 so that relative to them rotor 1 is revolving synchronous or asynchronous, in same or opposite direction.
4. Electrical machine like in requirement 1 ,2 and 3 characterized in this way: that in case when winding that produces rotational magnetic fields is on rotor 1 , stator and rotor 2, relativ to rotor 1 are always rotating in the same direction and relative to rotor 1 they can revolve synchronously or asynchronously, or, one synchronously another asynchronously.
PCT/HR2002/000028 2001-08-28 2002-05-20 Electrical machines with two rotating magnetic fields WO2003019755A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HR20010626A HRPK20010626B1 (en) 2001-08-28 2001-08-28 Electric machines with two rotating magnetic fields
HRP20010626A 2001-08-28

Publications (1)

Publication Number Publication Date
WO2003019755A1 true WO2003019755A1 (en) 2003-03-06

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WO (1) WO2003019755A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2654185A3 (en) * 2012-04-19 2017-08-23 Hamilton Sundstrand Corporation Multi-rotor generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1313117A (en) * 1961-10-14 1962-12-28 Free-cage rotating field induction machine, serving as a multiplier relay
AU1971083A (en) * 1982-09-28 1984-04-05 Zak, Z.B. Electric machine speed variator
US5525851A (en) * 1992-12-04 1996-06-11 Toshiba Kikai Kabushiki Kaisha Apparatus for producing high-speed rotation
DE19821632A1 (en) * 1998-05-14 1999-11-18 Stephan Joeckel Induction machine with excitation by rotating permanent magnet ring

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1313117A (en) * 1961-10-14 1962-12-28 Free-cage rotating field induction machine, serving as a multiplier relay
AU1971083A (en) * 1982-09-28 1984-04-05 Zak, Z.B. Electric machine speed variator
US5525851A (en) * 1992-12-04 1996-06-11 Toshiba Kikai Kabushiki Kaisha Apparatus for producing high-speed rotation
DE19821632A1 (en) * 1998-05-14 1999-11-18 Stephan Joeckel Induction machine with excitation by rotating permanent magnet ring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2654185A3 (en) * 2012-04-19 2017-08-23 Hamilton Sundstrand Corporation Multi-rotor generator

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Publication number Publication date
HRPK20010626B1 (en) 2004-06-30
HRP20010626A2 (en) 2003-06-30

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