WO2012093951A2 - Polyphase electric generator with switched reluctance - Google Patents
Polyphase electric generator with switched reluctance Download PDFInfo
- Publication number
- WO2012093951A2 WO2012093951A2 PCT/RO2011/000010 RO2011000010W WO2012093951A2 WO 2012093951 A2 WO2012093951 A2 WO 2012093951A2 RO 2011000010 W RO2011000010 W RO 2011000010W WO 2012093951 A2 WO2012093951 A2 WO 2012093951A2
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- WIPO (PCT)
- Prior art keywords
- rotor
- phase
- poles
- electric generator
- stator
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/18—Synchronous generators having windings each turn of which co-operates only with poles of one polarity, e.g. homopolar generators
- H02K19/20—Synchronous generators having windings each turn of which co-operates only with poles of one polarity, e.g. homopolar generators with variable-reluctance soft-iron rotors without winding
Definitions
- the invention relates to an electric generator, with switched reluctance, with fixed inductor and induced, for the production of electricity, by the mechanical motion of a magnetic circuit switch, usable in any application of a power system, including renewable.
- magnetic flux variation can be obtain by varying the magnetic circuit permeability in some generator machines based on variation phenomenon of the reluctance of the stator magnetic field by the variation of the electrical gap, according to:
- the efficiency of the machine is relatively low related to the volume and the mass of the constituents
- the technical problem solved by the invention is that it ensures a reduction of the mechanical energy necessary to produce electric power by the fact that the resistive mechanical torque is relatively independent to the value of the current from the electric charge and a significant increase in reliability by the fact that the inductor coils o the permanent magnets and the induced coils are rigidly fastened on the stator.
- the electric generator with switched reluctance due to the construction, it provides a significant increase of the conversion efficiency of the mechanical energy in electric power because it uses a magnetic circuit neutral switch between the inductors (the magnetic tension generators) and induced, by the switching of routing of the stator magnetic flux without the relative movement of those, one to another.
- electric generating machine has the following advantages:
- the resistant mechanical torque (on the shaft) is relatively independent to charging with the electric charge; which implies that over a certain generated electric power, the necessary mechanical power is significantly lower than the most efficient electric generators known, respectively the synchronous generators with permanent magnets located on the rotor, with or without polar parts;
- the electric generator with switched reluctance is an alternating current electrical machine composed of a stator (1) (ferromagnetic) that contains, in the basic version, four poles PI, P2, P3 and P4 ; with two electro- generator windings (2) and (2') arranged on two opposite sides and two permanent magnets (3) and (3') inserted on the other two sides, oriented in such a way that the direction of the magnetization to be convergent toward the winding side (2)
- a rotor (4) (ferromagnetic) that performs a magnetic circuit closing between two opposite poles on the « minimum reluctance » principle, respectively Pland P3 (according to the Fig.2.1), or P2 and P4 (according to the Fig.2.2).
- the inductor made with permanent magnets having two excitation windings placed according to the Fig.1., called « inductor » on which there will be applied direct current voltages in such a way that to be respected the magnetic polarization principle that assures the convergence of the fields between the windings called « induced » similarly with the representation of the fields from the Fig.2.1 or Fig.2.2.
- « inductor » on which there will be applied direct current voltages in such a way that to be respected the magnetic polarization principle that assures the convergence of the fields between the windings called « induced » similarly with the representation of the fields from the Fig.2.1 or Fig.2.2.
- the value of the inductor flux is defined by a function variable in time that vectorial sums the fluxes generated by the two permanent magnets that create two intensities of magnetic field Hp , respectively Hp' thus :
- ⁇ E (t) is the magnetic flux from the stator, generated by the magnet (3)
- ⁇ ' ⁇ ( ⁇ ) is the magnetic flux from the stator, generated by the magnet (3');
- the inductor flux variation is performed by the switching of the convergent magnetic circuits in the space ⁇ on the « minimum reluctance » principle; the value of the reluctance having a variation depending on time Rm (t) expressed by the relationship:
- l sta t id is the length of the magnetic circuit space in the stator
- lrot is the length of the magnetic circuit space in the rotor
- N (t) - ⁇ ⁇ ⁇ HFe (d n P ⁇ sin ⁇ ⁇ ⁇
- K (mg / ((po ⁇ + (stat + (wt ), represents the length of the magnetic circuit
- N (t) N ⁇ 2 ⁇ ⁇ 0,5Hc (d Ke-n P 2ni sin2n P Dt Where D is the rotative speed on the generator shaft.
- Umax NSE ⁇ ⁇ 0,5 ⁇ ⁇ ⁇ ⁇ 2 ⁇ ⁇
- the value of the induced voltages in the induced windings is a function variable in time, that can be used directly or by electronic modifications and processing.
- the Gaussian aspect of the torque recommends the generator with variable reluctance for the use in the applications of welding and charging of the storage cell batteries; without the use of additional equipments of adjustment.
- the multi-phase and multi-polar generator is composed of an assembly of the mono-phase modular stacks stators, coaxially placed and displaced in phase steps shifts against to the monobloc rotor, ornot displaced in phase, but coaxially placed against to an modular stacks rotor displaced in phase steps shifts to the left or right to central midway phase position (according to the Fig. 5.4), so as to achieve a total compensation of dynamic and static reluctant (cogging) torques having the mover or resistant torques sum equal to zero to any position of the rotor, that produce electromotive voltages in
- the coaxial modular model for the placing of the stators For designing for rotative speeds and powers different from the basic configurations, it will be used the coaxial modular model for the placing of the stators, fact that allows the obtaining however phases, and of any power with different values of voltage and currents at nominal rotative speeds that can go down to values of 50 rot/min and for optimization there can be build the stator from an assembly of individual coiled stator segments and modularly mounted (according to the Fig. 6.1 and 6.2) so as to restore the stator circular shape, facilitating the automated coiling.
Abstract
The invention relates to an electric generator, with switched reluctance, with fixed inductor and induced, for the production of electricity in alternating current so that, due to the constructive particularities, the variation of magnetic flux is achieved through the mechanical movement of a magnetic circuit switch that performs the switching of routing of the stator magnetic circuits, without the relative displacement of the inductor against the induced and without the length variation of the electrical gap between those, usable in any energy system application, including renewable. According to the invention, the electric generator is composed in the one- phase basic version, in successive order, of inductor windings or inductor permanent magnets, transversally coiled respectively inserted on a circular ferromagnetic stator between adjacent poles, oriented so that the direction of the magnetization to be convergent towards induced windings transversally placed and coiled along the magnetic circuit between the next poles, for the production of electricity, by the switching of magnetic circuit through a ferromagnetic switch called "rotor", that performs a switching of magnetic flux in the induced windings with electric generator function, through the motion of mechanical rotation, that performs a magnetic circuit closing consecutively from two to two poles, on the "minimum reluctance" principle. In the case of some renewable energy applications (wind turbines or water turbines) where it is necessary the obtaining of frequency and voltage usable values at low rotative speeds of the rotor, the electric generator, according to the invention, can be realized with an additional number of one-phase stator poles in multiple of four, by the relationship : Psk=4xk poles, where k= 1,2,...,n; n ∈ N; for obtaining of frequency values usable by the network, at reduced nominal rotative speeds of the rotor, without the use of mechanical reducers or multipliers between the propeller shaft and the generator shaft. For the internal compensation of the starting reluctant torque (cogging) it is built the variant assembly of modular mono-phase stators stacks, placed coaxially and displaced in phase against to an monobloc rotor, or not displaced in phase, but coaxially placed against to an modular stacks rotor displaced in phase steps shifts, so that the dynamic and static torques sum to be zero at any position of the rotor.
Description
POLYPHASE ELECTRIC GENERATOR
with
SWITCHED RELUCTANCE
DESCRIPTION
The invention relates to an electric generator, with switched reluctance, with fixed inductor and induced, for the production of electricity, by the mechanical motion of a magnetic circuit switch, usable in any application of a power system, including renewable.
In the present engineering, there is known the production of electricity from the mechanical energy by the circular or oscillatory relative displacement of two fundamental elements called induced (the electric generator element) and inductor (the element that generates magneto motive tension), which are based on electromagnetic induction law, that converts the mechanical energy into electrical energy by the fluctuation of the magnetic flux produced by a magnetic field source.
Because of the functional symmetry, in case of all the electric machines based on this principle, when they are joined to an electric charge, the electric current occurred in induced generates other magnetic field that opposes to the inductor field generating a force of resistance that acts directly on the generating mechanical motion, being directly proportional to the current value of the electric charge.
This phenomenon makes that the mechanical power necessary to maintain electrical parameters (voltage, frequency) to proportionally increase with the charge electric current value (the delivered electrical power).
It is also known that magnetic flux variation can be obtain by varying the magnetic circuit permeability in some generator machines based on variation phenomenon of the reluctance of the stator magnetic field by the variation of the electrical gap, according to:
Brevet RO 116330 Bl « AC ELECTRIC GENERATOR WITH VARIABLE
RELUCTANCE, WITH OSCILLATORY TRANSLATION MOTION » ;
US Patent No. 4.636.674 « LINEAR FLUX SWITCH ALTERNATOR » ;
US Patent No. 3.253.170 « QUIET FLUX-SWITCH ALTERNATOR » ;
in these cases, the efficiency of the machine is relatively low related to the volume and the mass of the constituents;
The technical problem solved by the invention is that it ensures a reduction of the mechanical energy necessary to produce electric power by the fact that the
resistive mechanical torque is relatively independent to the value of the current from the electric charge and a significant increase in reliability by the fact that the inductor coils o the permanent magnets and the induced coils are rigidly fastened on the stator.
The electric generator with switched reluctance, due to the construction, it provides a significant increase of the conversion efficiency of the mechanical energy in electric power because it uses a magnetic circuit neutral switch between the inductors (the magnetic tension generators) and induced, by the switching of routing of the stator magnetic flux without the relative movement of those, one to another.
According to the invention, electric generating machine has the following advantages:
- the resistant mechanical torque (on the shaft) is relatively independent to charging with the electric charge; which implies that over a certain generated electric power, the necessary mechanical power is significantly lower than the most efficient electric generators known, respectively the synchronous generators with permanent magnets located on the rotor, with or without polar parts;
- maximum reliability due to the structural features - the inductor and the ind€ed^e^ste ed n e-stat0rT&
of the excitation contacting brushes or of the fastening elements of the magnets on the rotor, eliminating the risk of high centrifugal forces that can lead to the detachment and irreversible damage;
- low inertia of the rotor due to its simplicity and low weight;
- universal application - it can be designed for a wide range of power and rotative speed between the known technological limits by multipolar usage for conventional or renewable energy systems, welding or power supply generator sets, stationary or mobile, with adjustable excitation or using inverter technology;
- It is ideal in submersible applications or in explosive atmosphere.
Subsequently, there is an example for execution of the invention, related to Fig.1 -6, which represents:
- Fig.1, 3D base assembly model of the generator;
- Fig.2.1 , operating base model of the generator with the rotor in the position P1-P3;
- Fig.2.2, operating base model of the generator with the rotor in the position P2-P4;
- Fig.2.3.1, linear functional model with circuit left closed;
- Fig.2.3.2, linear functional model in transitive open circuit;
- Fig.2.3.3, linear functional model with circuit right closed;
- Fig.3, multi-polar constructive model;
- Fig.4.1 , the chart of variation of the resistant torque to the shaft depending on the resistive charge;
- Fig.4.2, the chart of variation of the resistant torque to the shaft depending on the rotative speed to the constant resistive charge;
- Fig.5.1 , constructive model of modular coaxial three-phase basis;
- Fig.5.2, linear representation of multi-polar three-phase constructive model;
- Fig.5.3, spatial representation of modular three-phase multi-polar
constructive model;
- Fig.5.4, plane partial representation of modular three-phase multi-polar rotor;
- Fig.6.1 , plane partial representation of segmentary stator assembly;
- Fig.6.2, plane partial representation of stator segment;
The electric generator with switched reluctance, the basic version, it is an alternating current electrical machine composed of a stator (1) (ferromagnetic) that contains, in the basic version, four poles PI, P2, P3 and P4 ; with two electro- generator windings (2) and (2') arranged on two opposite sides and two permanent magnets (3) and (3') inserted on the other two sides, oriented in such a way that the direction of the magnetization to be convergent toward the winding side (2)
(according to the Fig.2.1 and Fig.2.2) ; and a rotor (4) (ferromagnetic) that performs a magnetic circuit closing between two opposite poles on the « minimum reluctance » principle, respectively Pland P3 (according to the Fig.2.1), or P2 and P4 (according to the Fig.2.2).
For use in applications where the value of the voltage delivered on randomly variable charges require an automatic adjustment, there can be replaced the inductor made with permanent magnets having two excitation windings placed according to the Fig.1., called « inductor », on which there will be applied direct current voltages in such a way that to be respected the magnetic polarization principle that assures the convergence of the fields between the windings called « induced » similarly with the representation of the fields from the Fig.2.1 or Fig.2.2.
In order to explain the principle of induced tensions generation ιι^γ (t) ;
respectively u ΝΓ (t) in the collecting windings (2) and (2'), we consider the physical effect achieved by the switching of magnetic circuit between the alternate positions mentioned above, that performs a variation of magnetic flux d^p(t) .
We will calculate the unit value of the voltage ιΐγ (t) along a curve Γ, by applying:
- the electromagnetic induction law «r(t) =—
dt
The value of the inductor flux is defined by a function variable in time that vectorial sums the fluxes generated by the two permanent magnets that create two intensities of magnetic field Hp , respectively Hp' thus :
0>r(t) = f¾(t) where: <pr(t) is the resulting magnetic flux from the stator in the section of the curve Γ ;
^E(t) is the magnetic flux from the stator, generated by the magnet (3); φ'^(ί) is the magnetic flux from the stator, generated by the magnet (3');
If there is no rotor (equilibrium situation), then: (pr(t) = 0. So p¾t) = - pB(t);
In the presence of the ferromagnetic rotor (4), the inductor flux variation is performed by the switching of the convergent magnetic circuits in the space Γ on the « minimum reluctance » principle; the value of the reluctance having a variation depending on time Rm (t) expressed by the relationship:
Rm (t) = Rmstat (t) + Rmrot (t) = - +
μ S μ(τ) S
Where:
lstat id is the length of the magnetic circuit space in the stator;
lrot is the length of the magnetic circuit space in the rotor
(4);
S is the section of the magnetic circuit in the space Γ Applying Ohm's law for magnetic circuits, we have: t) =- SEI + 2^ - Hp ¼/(t) = Hp ¼μ0 (1+μ εο82ωί);
Rm (t) Km (t) lrot lrot which means that:
IINT (t) μ sin2a)t = n V (t)
In the case of renewable energy applications (wind turbines or water turbines) where it is necessary the obtaining of usable values of voltage and frequencies at reduced rotative speeds of the rotor, electrical generator, according to the invention, they can be achieved with an additional number of one-phase stator poles in multiple of four, by the relationship:
Psk=4xk poles, where k= 1,2, ...,n ; n G N ; and the rotor with
Prk=4xk/2 poli, unde k= 1,2, ...,n; n€ N ;
In this case we can say that the generator with a certain number of poles k, it is composed in the one-phase basic version, in succeeding order, by inductive windings or inductor permanent magnets, coiled respectively sectional inserted on a circular ferromagnetic stator between the adjacent poles (according to the Fig 2.3.1- 3), oriented so that the magnetization direction to be convergent towards induced windings sectional placed and coiled along the magnetic circuit between the next poles, for the production of electricity, by the switching of magnetic circuit through a ferromagnetic switch called "rotor", which performs a switching of magnetic flux in the induced windings having electricity generating function, by the motion mechanical rotation, that accomplish a magnetic circuit closing, consecutively from two to two poles, on the "minimum reluctance" principle for the obtaining of values of the usable frequency of 50 Hz, with nominal rotative speeds D of the rotor deducted according to the relationship:
D =3000/k rot/min, where. k= 1,2, ...,n ; n€ N ; without the use of multipliers or mechanical reducers between the propeller shaft and the generator shaft.
For the linear generalized polar situation presented in Fig.2.3.1., from the Ampere's law for the magnetic circuit:
And neglecting the losses from the electrical gap, we obtain:
HFe = - HM (mg / fee = - 0,5Hc (mg / (tpol + (stat + (rat )
It results that the maximum value of the current (short) has the expression:
It can be seen that - the value of the maximum current does not depend on the rotative speed.
To calculate the value of e.m.v. (idle), we will use
In our case: ¾ (t) = ~ Nsp B dB_Fe (t)
di
So:
"N (t) = - Ν§β ο μτ HFe (d nP ω sin ηΡωί
«Ν (t) = Ns£ nP μο μΓ (ά 0,5Hc Kt ω sin ηΡωί
where:
K = (mg / ((po\ + (stat + (wt ), represents the length of the magnetic circuit
«N (t) = N§2 μο μΓ 0,5Hc (d Ke-nP 2ni sin2nP Dt
Where D is the rotative speed on the generator shaft. Umax = NSE μο μΓ 0,5Ηο ^ά Κ η 2π ϋ
As it can be observed, the value of the induced voltages in the induced windings is a function variable in time, that can be used directly or by electronic modifications and processing.
Also, we can calculate the values of the resistive mechanical moment to the rotor M(t) according to the energy of the magnetic field Wm and the angular velocity ω by the expression:
M(t) = d- t)a 4 HE! (1. SIN2A)T ) ;
cot cot
Values of the function being represented in the charts from the Fig. 4.1 and Fig. 4.2., obtained with values resulted from tests performed on the base prototype.
Which means that its value is a function variable in time that has « mover moments » (positive) and « braking moments » (negative) ; as a whole we can say that to a complete rotation of 360°, the sum of idle moments is:
∑ M(t) = 0
From the computer simulated graphical representations, we can conclude that the resistant mechanical torque to the shaft of the generator does not depend on the delivered current value; succeeding in short-circuit to have values almost equal to the no charge regime (with zero current).
Consequently, the Gaussian aspect of the torque recommends the generator with variable reluctance for the use in the applications of welding and charging of the storage cell batteries; without the use of additional equipments of adjustment.
Because in the basic configuration there is a reluctant torque (for start) having a maximum that reaches an excessively big value (according to the Fig. 4.2) and presents (under 50 rot/min) a sinusoidal variation, damped with the increase of the rotative speed, there are areas of maximum and minimum that affects the continuity of the resistant torque to the shaft including the idle situation, we have developed a model of generator with basic constructive three-phase modular stator - according to
the Fig.5.1.- that represents an internal compensation of the reluctant torques, so that the dynamic and static torques sum to be zero in any position of the rotor, according to the model of three-phase systems, but unlike them, the degree phase displacement is achieved by the coaxial placing of three modular stators placed along the same rotor, represented in the linear model from the Fig. 5.2. and spatially in the Fig. 5.3.
Generalizing, we can say that the multi-phase and multi-polar generator is composed of an assembly of the mono-phase modular stacks stators, coaxially placed and displaced in phase steps shifts against to the monobloc rotor, ornot displaced in phase, but coaxially placed against to an modular stacks rotor displaced in phase steps shifts to the left or right to central midway phase position (according to the Fig. 5.4), so as to achieve a total compensation of dynamic and static reluctant (cogging) torques having the mover or resistant torques sum equal to zero to any position of the rotor, that produce electromotive voltages in
independent and poly-phase ratio one to another.
For designing for rotative speeds and powers different from the basic configurations, it will be used the coaxial modular model for the placing of the stators, fact that allows the obtaining however phases, and of any power with different values of voltage and currents at nominal rotative speeds that can go down to values of 50 rot/min and for optimization there can be build the stator from an assembly of individual coiled stator segments and modularly mounted (according to the Fig. 6.1 and 6.2) so as to restore the stator circular shape, facilitating the automated coiling.
Claims
Rl. Electric generator, with switched reluctance, characterized by the fact that, it is designed to produce alternating current so that, due to its constructive particularities, the variation of the magnetic flux is accomplished by the switching the stator magnetic circuits route, without the relative displacement of the inductor against the induced and without the variation of length of the electrical gap between those.
R2. The electric generator with switched reluctance, according to the claim Rl, characterized by the fact that, is composed in the one-phase basic version, in successive order, of inductor windings or inductor permanent magnets, transversal coiled respectively inserted on a circular ferromagnetic stator between adjacent poles, oriented so that the magnetization direction to be convergent towards the induced windings transversal placed and coiled along the magnetic circuit between the next poles, to produce electricity, by the switching of magnetic circuit through a ferromagnetic switch called "rotor", that performs a switch of magnetic flux in the induced windings with electric generator function, through the motion of mechanical rotation, that performs a closing of magnetic circuit, consecutively from two to two poles, on the "minimum reluctance" principle.
R3. The electric generator with switched reluctance, according to the claim Rl and R2, characterized by the fact that, the number of one-phase stator poles is in multiple of four, on the relationship Psk=4xk poles (where k= 1,2, ...,n ; n G N) and the rotor with Prk=4xk/2 poles (where k= 1,2, ...,n; n G N), the magnetic circuits performing from two to two poles, for the obtaining of values of usable frequency of 50 Hz, on nominal rotative speeds of the rotor, deducted according to the relationship D =3000/k rot/min (where k= 1,2, ...,n ; n G N), without the use of mechanical multipliers or reducers.
R4..The electric generator with switched reluctance, according to the claim Rl, R2 and R3, characterized by the fact that, is composed of an assembly of the mono-phase modular stacks stators, coaxially placed and displaced in phase steps shifts against to the monobloc rotor, omot displaced in phase, but coaxially placed against to an modular stacks rotor displaced in phase steps shifts, so as to achieve a total compensation of dynamic and static reluctant (cogging) torques having the mover or resistant torques sum equal to zero at any position of the rotor, that can produce electromotive voltages in independent and poly-phase ratio one to another.
R5..The electric generator with switched reluctance, according to the claim R2, and R3 characterized by the fact that, is composed of an assembly of individual coiled stator segments and modularly mounted so that to restore the stator circular shape, facilitating the automated coiling.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ROA201100001 | 2011-01-03 | ||
| ROA201100001A RO126894A0 (en) | 2011-01-03 | 2011-01-03 | Switched reluctance electric generator |
| RO201100233 | 2011-03-17 | ||
| ROA201100233 | 2011-03-17 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO2012093951A2 true WO2012093951A2 (en) | 2012-07-12 |
| WO2012093951A3 WO2012093951A3 (en) | 2012-12-27 |
| WO2012093951A4 WO2012093951A4 (en) | 2013-03-07 |
Family
ID=45478448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/RO2011/000010 WO2012093951A2 (en) | 2011-01-03 | 2011-03-28 | Polyphase electric generator with switched reluctance |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2012093951A2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3253170A (en) | 1963-02-12 | 1966-05-24 | Curtiss Wright Corp | Quiet flux-switch alternator |
| US4636674A (en) | 1985-07-19 | 1987-01-13 | Allied Corporation | Linear flux switch alternator |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2505130A (en) * | 1948-01-10 | 1950-04-25 | Indiana Steel Products Co | Inductor generator |
| SE358779B (en) * | 1970-01-08 | 1973-08-06 | Asea Ab | |
| CA2034163A1 (en) * | 1991-01-15 | 1992-07-16 | Leslie I. Szabo | Method of increasing the efficiency of an electrical generator (combination slis/e-slis) |
| GB2386479B (en) * | 1998-07-07 | 2004-08-25 | Branko Richard Babic | Electrical generator and electrical machine including the electrical generator |
| JP4193859B2 (en) * | 2006-04-04 | 2008-12-10 | トヨタ自動車株式会社 | Motor and energization control device for motor |
| GB2454170A (en) * | 2007-10-29 | 2009-05-06 | Technelec Ltd | Pole number changing in permanent magnet reluctance machines |
-
2011
- 2011-03-28 WO PCT/RO2011/000010 patent/WO2012093951A2/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3253170A (en) | 1963-02-12 | 1966-05-24 | Curtiss Wright Corp | Quiet flux-switch alternator |
| US4636674A (en) | 1985-07-19 | 1987-01-13 | Allied Corporation | Linear flux switch alternator |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012093951A3 (en) | 2012-12-27 |
| WO2012093951A4 (en) | 2013-03-07 |
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