WO2003043174A1 - Systeme de generateur a redresseur commande par commutateur - Google Patents

Systeme de generateur a redresseur commande par commutateur Download PDF

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Publication number
WO2003043174A1
WO2003043174A1 PCT/SE2002/002063 SE0202063W WO03043174A1 WO 2003043174 A1 WO2003043174 A1 WO 2003043174A1 SE 0202063 W SE0202063 W SE 0202063W WO 03043174 A1 WO03043174 A1 WO 03043174A1
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WO
WIPO (PCT)
Prior art keywords
phase
phase winding
rail
switch sets
switches
Prior art date
Application number
PCT/SE2002/002063
Other languages
English (en)
Inventor
Lennart Stridsberg
Original Assignee
Stridsberg Innovation Ab
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
Priority claimed from SE0103800A external-priority patent/SE0103800D0/xx
Priority claimed from SE0200203A external-priority patent/SE0200203D0/xx
Priority claimed from SE0200941A external-priority patent/SE0200941D0/xx
Application filed by Stridsberg Innovation Ab filed Critical Stridsberg Innovation Ab
Publication of WO2003043174A1 publication Critical patent/WO2003043174A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
    • H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices

Definitions

  • the present invention is concerned with electrical generators, especially generators used to supply electric energy to DC rails connected to batteries or relatively large capacitors.
  • electrical generators especially generators used to supply electric energy to DC rails connected to batteries or relatively large capacitors.
  • BACKGROUND OF THE INVENTION AND PRIOR ART Generators that supply energy to DC systems often have to supply a rather constant voltage even though the generator speed varies considerably.
  • a common example is the generator in a conventional car, which has to feed a battery with some 14 V when driven by an engine running from 1000 to 4000 rpm. In other cases generators running at constant speeds must be able to regulate the current supplied to a load with varying voltage.
  • An example is serial hybrids. Generators in such hybrids are often intended to permit some kind of heat engine to work at some optimal load point with small variations in speed, torque and power.
  • This constant power feeds an electric drive train and an energy storage such as a battery.
  • the voltage of this storage depends on the load from the drive train and on the state of the storage. For example, if the load is high and the depth of discharge is high, the system voltage will be low.
  • Prior art solutions often use generators designed in a way that permits a variation of the emf obtained at a given rotational speed.
  • the change of the voltage constant for example expressed as V/rpm, can be achieved by adjustment of the rotor excitation current.
  • U.S. patent 5,663,605 describes a generator rotor having 12 rotor poles, 6 of which has permanent magnets and 6 of which have coils.
  • the voltage constant obtained when the wound rotor poles have no current can be increased by a coil current that gives the six wound poles polarities that create an emf that assists the emf of the permanent magnet poles.
  • a control current in the opposite direction will cause the emf of the wound poles to counteract the emf of the permanent magnet poles.
  • U.S. patent 5,656,922 describes another solution where windings on the rotor can increase the flux from permanent magnets on the rotor. Such arrangements require DC current to be supplied to the rotor, for example through slip rings.
  • patent 4,656,379 shows a generator consisting of two stator and rotor parts where half of the rotor poles have permanent magnets and the remaining half have non-wound iron poles.
  • the voltage constant of the generator can be adjusted by a control DC current flowing in a coil around the center of the stator and coaxial with the generator shaft. This arrangement does not require any slip rings.
  • the published Japanese patent application 8140214 shows a similar arrangement.
  • It is an object of the invention is to provide a generator system having a high efficiency.
  • Another object of the invention is to provide a generator system having low component costs.
  • One basic principle of the invention is to use switches to permit adding of the voltages from the generator phase emf and the DC rail to rapidly establish a suitable initial current in the generator phase winding in the beginning of each half period of the generator phase emf. The switches are then disabled and the current in the phase winding will then continue as in a conventional diode rectifier. This principle can be used when the peak value of the phase emf is lower than, equal to or larger than the DC rail voltage.
  • a switch controlled rectifier generator system comprises phase windings in which phase emfs are induced.
  • the phase windings are connected in H-bridges having legs in which switch sets are connected and which are connected between the poles of a DC rail.
  • the switch sets include switches and diodes connected in parallel, and the switches are controlled by a control unit such as an electronic processor.
  • the switches can then disabled, later in the same half period, and the current in the phase winding will then, during the rest of the half period, continue as in a conventional diode rectifier, passing through diodes of the switch sets, the switches of which were not previously enabled/disabled. These switches can now, if required, be enabled, i.e. to an on-state, to reduce the voltage drop over the switch sets.
  • the times of enabling/disabling the first mentioned switches can be selected to provide a desired, average DC current in the DC rail. This control method can be used when the peak value of the phase emf is lower than, equal to or larger than the DC rail voltage but preferably in the last or latter cases.
  • a DC generator system can comprise at least one phase winding in which a phase emf is induced, in many cases at least two phase windings and typically three phase windings.
  • the system further comprises a DC rail including two poles into which DC current is fed from the one or more phase windings.
  • Switch sets are provided connected to the DC rail and the one or more phase windings. Each switch set includes a switch and a rectifier diode connected in parallel with each other.
  • the system has a multitude of structural details which can be used alone or in combination with each other.
  • each of the two ends of a phase winding can be connected to the two poles of the DC rail through switch sets, and the phase winding can be arranged, such as by having a sufficient number of winding turns, so that the voltage of the DC rail for at least some operating conditions of the DC generator system is higher than the peak of the absolute value of the phase emf induced in the at least one phase winding.
  • a control unit connected to and controlling the switches of the switch sets can be arranged to control, for each of the phase windings the switches of selected ones of the switch sets, at a first time in the beginning of a half period of the phase emf, to connect the phase winding to the DC rail in such a way that the DC rail voltage is added to the phase emf.
  • the same switches can be controlled to force, at a later, second time in the same half period, the phase current in the phase winding to enter the DC rail through other switch sets, in the direction of and passing at least partly through the diodes of these other switch sets, i.e. not through said first mentioned switches and not through the diodes connected in parallel with said first mentioned switches.
  • the first time can be selected to be in the beginning of a half period of the phase emf, in which beginning a phase emf having a relatively low absolute value is induced.
  • the first and second times can be selected so that the average net current to the DC rail from the phase winding during the half period achieves a desired value.
  • the system can work, after said second time in the half period, as a periodically switched bridge, controlling at at least one third time the switches of the selected switch sets to connect the phase winding for a relatively short time period in the same way as at and directly after said first time.
  • the switches of selected ones of the switch sets can be controlled to be in on-states for only periodically repeated, relatively short time periods to connect the phase winding to the DC rail through the selected switch sets to create a substantially sinusoidal current in the phase winding.
  • the switch sets can generally be connected to the phase winding to permit adding of the phase emf and the voltage on the DC rail. Then for a phase winding, selected first ones of the switch sets that are connected to the phase winding can be controlled to have their switches to be in on-states, i.e. conducting states, to rapidly establish a suitable initial current in the phase winding in the beginning of each half period of the phase emf of the phase winding. Then, after a controlled time period, the switches of the first switch sets can be controlled to be in off-states, i.e. non-conducting states, allowing the current in the phase winding to pass or continue through the rectifiers of second ones of the switch sets connected to the at least one phase winding.
  • the second switch sets are then different from the first switch sets.
  • a phase winding and the switch sets connected thereto are preferably connected in an H- configuration, also called as an H-bridge.
  • the phase winding is then connected in the web portion of the H-configuration and two switch sets are connected in series with each other in each leg of the H-configuration.
  • the ends of the phase winding is connected to the connection points of the switch units in the legs.
  • the ends of the legs of the H-configuration are preferably connected to the poles of the DC rail.
  • Mechanical switches can be connected between portions of a phase winding for allowing, when being in a first state, all of the phase emf induced in the phase winding to be provided to the DC rail, and in a second state, only the emf induced in a portion of the phase winding to be provided to the DC rail.
  • mechanical switches can be connected between portions of the phase winding for allowing, when being in a first state, all of the emf induced in the phase winding to be provided to the DC rail, and in a second state, the emfs induced in the portions of the phase winding to be provided in parallel to the DC rail.
  • phase winding can be arranged so that the phase emf induced therein varies periodically and takes both polarities.
  • the phase emf can have a waveform that is nearly or substantially sinusoidal or resembles a sinusoid.
  • Fig. lb is a principle circuit diagram of a conventional brushless generator using a rectifier bridge.
  • FIG. 2 is a schematic cross sectional view of a generator having a stator with windings of three separated phases
  • Fig. 3a is a schematic circuit diagram of a switched system comprising three H-bridges and a generator with three separate phases,
  • Fig. 3b is a schematic circuit diagram of an unswitched system comprising twelve diodes and a generator with three separate phases,
  • Fig. 4 is a diagram of emf and current for a switch controlled rectifier generator as a function of time
  • Fig. 5 is a diagram of emf and current for a generator with a diodes only rectifier as a function of time
  • - Fig. 6 is a diagram of emf and phase and output currents for a conventional switch controlled generator as a function of time
  • - Fig. 7 is a diagram of emf and current of the system of Fig. 4 at high speed as a function of time
  • - Fig. 8 is a diagram of emf and current of the system of Fig. 4 at lower speed as a function of time
  • Fig. 9 is a diagram of emf and current of the system of Fig. 4 at even lower speed as a function of time
  • Fig. 10 is a circuit diagram of a relay connection to permit regulation over a larger speed range
  • Fig. 1 1 is a circuit diagram of a relay connection to permit constant power regulation over a larger speed range
  • Fig 12 is a diagram showing an alternative method of driving the switches for a condition similar to that shown in Fig. 9.
  • the three phases of the generator are not in direct galvanic contact with each other; i.e. if the generator is disconnected from the electronic circuits, the three phases of the generators of the embodiments shown will be insulated from each other. This gives advantages in reliability and control compared to the conventional Y-connection of the three phases as shown in Figs, la and lb where the three phases are in galvanic contact with each other in the center point of the Y connection..
  • Fig. la is a schematic circuit diagram of an electric DC generator having a three phase winding with phase windings 108, 109 and 110 connected in a Y-arrangement.
  • the stator phases are in the conventional manner connected to a six switch bridge including switch sets 111 - 116.
  • the bridge includes three legs connected between the positive and negative rails 117, 1 18.
  • Each leg contains two switch sets connected in series with each other, one of the terminals of a phase winding connected to the connection point between the two switch sets in a leg.
  • the switch sets are controlled by a control circuit 119.
  • Each switch set can comprise a single semiconductor switch of a suitable kind or a switch such as an FET and a rectifying element such as a diode connected in parallel to each other, the rectifying element or part of the switch set connected to allow current flow from the negative rail 118 to the positive rail 117.
  • the semiconductor switch and the rectifying diode are integrated in the same chip.
  • the function of the switch sets should thus be to always permit current to flow in one direction and, when the switch part of the switch sets is enabled or in an on-state, flow is also permitted to flow in the opposite direction.
  • the generator output is delivered on the rails as a DC voltage U ra , ⁇ and a current I out flowing through a load L connected between the rails.
  • the load can include an accumulator, e.g. for additional driving of a vehicle.
  • Fig. lb is a schematic circuit diagram of an electric generator having a three phase winding with phase windings 108, 109 and 110 connected in a Y-arrangement as in Fig. la.
  • the stator phases are in the conventional manner connected to a six diode rectifier bridge including three legs in which diodes 121 - 126 are connected in the same way as in Fig. la.
  • Fig. 2 is a schematic cross sectional view of an electric generator of a type suitable for the invention.
  • the generator has permanent magnets 199 in its rotor 200, and a three phase winding in which each phase winding includes six separate windings Ul - U6, VI - V6 and Wl - W6, not shown in Fig.
  • Figs. 3a and 3b are schematic circuit diagrams showing the phase windings Ul - U6, VI - V6 and Wl - W6 of an electric generator, such as that illustrated in Fig. 2, connected to three separate H-bridges having legs which are connected between the positive rail 1 17 and the negative rail 118.
  • the windings of phase W are connected as the web of to the H- bridge 309-310-311-312.
  • switch sets are connected in the two legs of this H-bridge, the switch sets being of the general kind illustrated in and described with reference to Fig. la.
  • a first leg of the H-bridge switch sets 309 and 310 are connected in series, one end terminal of the W phase winding connected to the connection point of these two switch sets.
  • the other end terminal of the W phase winding is connected to the connection point of the two switches 311 and 312 connected in series with each other in the other leg of the same H-bridge.
  • the current in each of the phase windings can be detected by sensors 313-315 connected in series with the windings.
  • the control unit 119 will in most applications also have a position sensor like item 120 of Fig. 1.
  • Figs. 4, 5 and 6 show waveforms for a typical case of driving the same ferromagnetic stator and rotor of an electric DC generator to give the same average current I out of 675 A, corresponding to 225 A from each phase, flowing out of and into the DC-rails having a voltage of 220 V, but using three different electronic circuits/switching and rectifying arrangements connected between the generator phase windings and the DC rails.
  • the diagram Fig. 4 illustrates the operation of a generator having an extended switching arrangement connected as illustrated in Fig. 3a
  • the diagram of Fig. 5 illustrates the operation of a generator having only diode rectifiers connected in the conventional way as illustrated in Fig. 3b
  • the diagram of Fig. 6 illustrates the operation of a generator that is switch controlled in the conventional way as illustrated in Fig. 1 a.
  • the number of turns in the stator windings are adjusted to fit the electronic circuits used.
  • the number of turns will affect the generator emf constant, which increases linearly with the number of turns, the generator inductance, which increases with the square of the number of turns, and the generator resistance, which approximately increases with the square of the number of turns.
  • the number of winding turns for the two systems in which switches are used have been selected so that the limit, i.e. the highest, rotational speed for the rotor is 1.6 times the speed used in the characteristic operation diagrams shown in Figs. 4 - 6.
  • the speed limit is reached when the target current is reached with a switch enable time that approaches zero, as will be described below with reference to Fig. 7.
  • the speed limit is selected so that the peak value U pp of the phase to phase emf voltage U pp is equal to the DC rail voltage U rail , see Fig. la for the definition thereof.
  • the system shown in Fig. 3b with simple diode rectifiers there is not much choice for the winding. With the given generator speed and DC rail voltage, the properties of the winding are narrowly defined.
  • the diagram of Fig. 4 shows the switching waveform for one phase of the generator of Fig. 3 a using three separate H bridges.
  • the generator phase emf the bell shaped curve E
  • the generator phase emf the bell shaped curve E
  • U the nominal DC rail voltage
  • the current fed to the DC rails is shown as "I charge U”.
  • switches for example 301 and 304 of Fig. 3a, are enabled, i.e. set to their conducting states or on-states, so that the battery voltage U is added to the emf. E of the generator phase winding. This causes a high voltage of some 370 to 440 V over the phase winding, causing the winding current to rapidly reach 251 A. This current is negative, i.e. energy is taken from the DC rails.
  • the same switches are disabled, i.e.
  • the switches are therefore enabled only once with no current passing through them and therefore causing no switching losses, and they are disabled only once as commanded by the control circuit, in the case illustrated in Fig. 4 when the stator winding emf reaches the voltage of the DC rail.
  • the emf E is larger than the rail voltage U.
  • the diagram of Fig. 5 shows the switching waveform for the generator system illustrated in Fig. 3b using three separate H rectifier bridges having no switches, for example one such H bridge including the diodes Dl, D2, D7 and D8.
  • the curve "I charge U" with a peak at 403 A is the current fed to the battery from one of the phases.
  • the diodes start to conduct when the emf of the generator phase winding, shown as the continuous bell shaped curve E with a peak at 427 V, becomes larger than the DC rail voltage, shown as the horizontal line U at 220 V.
  • the inductance is higher, i.e. more winding turns are required to get the higher emf, and as the voltage difference between the battery and the winding emf initially is very low, the current will rise slowly. If the rail voltage and generator speed are kept constant the charge current will be fixed.
  • Fig. 6 shows the switching waveform for the system illustrated in Fig. 3 a using three separate H bridges and a high frequency inverter, not shown.
  • the circuit diagram of this is identical with that of the system of Fig. 4; but the difference is the manner in which the switches are used.
  • the curve "I char U” with a peak at 469 A is the current for each half switching period fed to the battery from phase U.
  • the curve "I wind U” with a peak at 745 A is the current in the winding.
  • the switches are switched on and off at a high frequency. To simplify the figure, the ripple in the currents caused by the switching frequency is ignored.
  • the currents shown have the values that the average current should have if the real current values for some hundred cycles were averaged.
  • the rail voltage is shown as a horizontal line U at 220 V and the emf of the generator phase winding is shown as a continuous bell shaped curve "E phase U" with a peak at 131 V.
  • the switches are closed and opened some 12 times with a peak current of 745 A.
  • the system the characteristics of which are illustrated by the diagram of Fig. 5, using simple diode rectifiers as in Fig. 3b, has no costs for switches such as IGBT transistors, but has twice the stator copper loss.
  • the generator must therefore be made much larger and heavier and will use at least twice as much expensive magnet material. Added to this is that the current will depend only on generator rpm and battery voltage whereas the current from the system the characteristics of which are illustrated by the diagram of Fig. 4 can be adjusted by changing the turn on or turn off times of the switch.
  • the system the characteristics of which are illustrated by the diagram of Fig. 6, a conventional high frequency inverter, has slightly lower stator copper losses but will have higher iron losses due to the added iron loss in the stator iron when the stator poles act as high frequency inductances.
  • the generators the characteristics of which are illustrated by the diagrams of Figs. 4 and 6 will be approximately equal in size and cost.
  • the semiconductor costs for the system the characteristics of which are illustrated by the diagram of Fig. 6 are much higher than for the system the characteristics of which are illustrated by the diagram of Fig. 4.
  • the maximum current is almost three times higher.
  • the conduction losses can be estimated from the total charge passing through switches for each generator period, and is some 10 times larger for the system the characteristics of which are illustrated by the diagram of Fig. 6.
  • the switching losses can be estimated by adding the current being switched for each switching occurrence during one generator period. In the case of the system the characteristics of which are illustrated by the diagram of Fig. 4, there are only two occurrences, one of which has zero current.
  • the switching losses in the system the characteristics of which are illustrated by the diagram of Fig. 6 are therefore some 40 times larger than those of the system the characteristics of which are illustrated by the diagram of Fig. 4.
  • FIGs of Figs. 7 - 9 show electric characteristics of the generator-electronic circuit combination the characteristics of which are illustrated by the diagram of Fig. 4 at other driving conditions.
  • the speed and charge currents are increased 1.6 times in Fig. 7, decreased by 0.75 times in Fig. 8 and decreased by 0.56 times in Fig. 9.
  • the load conditions are selected so that the generator torque is approximately constant.
  • the diagram of Fig. 7 shows the characteristic curves of an operating case for the maximum speed possible to maintain the selected speed (???) independent constant torque at the generator shaft.
  • the switches are not enabled at all in the case shown in Fig. 7. If the generator shaft speed decreases, the generator torque can be maintained by having a switch enable time longer than zero. If the speed should increase over the case shown, the current will increase in the same way as for a system with simple diode rectifiers and the torque taken up will increase over the constant value shown in Figs. 4, 7, 8 and 9.
  • the case illustrated in Fig. 7 thus generally corresponds to the case including only diode rectifiers in the H-bridges, compare also the diagram of Fig. 5.
  • the diagrams of Figs. 8 and 9 show characteristic curves for lower speed cases. As the speed decreases, the current waveform becomes less even and the maximum current in the switches increases. It should be noted that in both cases, the generator emf, denoted by "E” in the figures, is lower than the battery voltage, "U" in
  • Fig. 10 is a schematic circuit diagram showing a system in which mechanical switches 1001 - 1003 having three positions are inserted in series with three of the phase windings. As shown, the switches can permit
  • FIG. 11 shows a more complex system where nine mechanical two-way or on-off switches 1101 - 1109 are used, i.e. three switches per phase. As shown, such an arrangement of switches can permit
  • phase U this requires switches 1101 and 1103 to be disabled and switch 1102 to be enabled. This will give full EMF and full inductance. This case permits a good regulation over high speeds.
  • phase U this requires switches 1101 and 1103 to be enabled and switch 1102 to be disabled. This will give half of full EMF and a quarter of full inductance. This case permit good regulation over low speeds and an optimum copper loss in the generator for a given charge current.
  • phase U this requires switches 1101 and 1102 to be disabled and switch 1101 to be enabled. This will give half of full EMF and half of full inductance. This case can be relevant if low currents are to be supplied at lower speeds.
  • the mechanical switches do not have to switch DC currents as they are inserted before the rectifiers.
  • the switching loads on the mechanical switches can be reduced by regulating the charge currents down to a minimum before changing the state of the mechanical switches.
  • the ability to change the connections between windings as shown in Figs. 10 and 11 permits a limited current from the electronic power circuits to give a higher starting motor torque at low speeds.

Abstract

L'invention concerne un système de générateur à redresseur commandé par commutateur comprenant des enroulements de phase (U1-6, V1-6, W1-6) dans lesquels des FEM de phase sont induites. Les enroulements de phase sont connectés dans des ponts en H comportant des tiges dans lesquelles des ensembles de commutateurs (301-312) sont connectés, et qui sont connectées entre les pôles (117, 118) d'un rail CC. Les ensembles de commutateurs comprennent des commutateurs et des diodes connectés en parallèle, les commutateurs étant commandés par une unité de commande (119). La configuration du pont en H complet permet d'obtenir une régulation efficace des courants de phase dans les enroulements de phase en vue d'une variation des conditions de fonctionnement. Ainsi, les commutateurs des ensembles de commutateurs appropriés connectés à un enroulement de phase peuvent être activés de façon à permettre l'ajout de la FEM de phase et de la tension du rail CC en vue d'établir rapidement un courant initial approprié dans l'enroulement de phase au début de chaque demi-période de la FEM de phase. Plus tard dans la même demi-période, lesdits commutateurs peuvent être désactivés, le courant dans l'enroulement de phase se présentant alors comme dans un redresseur à diode classique pendant le reste de la demi-période, ledit courant traversant les diodes des ensembles dont les commutateurs n'ont pas été activés/désactivés. Le nombre d'activations/désactivations peut être sélectionné en vue d'obtenir un courant CC souhaité dans le rail CC. Ce procédé de commande peut être utilisé lorsque la valeur de crête de la FEM de phase est inférieure, égale ou supérieure à la tension de rail CC.
PCT/SE2002/002063 2001-11-12 2002-11-12 Systeme de generateur a redresseur commande par commutateur WO2003043174A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
SE0103800A SE0103800D0 (sv) 2001-11-12 2001-11-12 Switch controlled recifier generator system
SE0103800-9 2001-11-12
SE0200203-8 2002-01-22
SE0200203A SE0200203D0 (sv) 2002-01-22 2002-01-22 A switch regulated rectifier generator system
SE0200941-3 2002-03-24
SE0200941A SE0200941D0 (sv) 2002-03-24 2002-03-24 A switch regulated rectifier generator system

Publications (1)

Publication Number Publication Date
WO2003043174A1 true WO2003043174A1 (fr) 2003-05-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8942013B2 (en) 2013-02-21 2015-01-27 Pratt & Whitney Canada Corp. Over voltage protection for electric machines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399146A1 (fr) * 1989-05-09 1990-11-28 General Electric Company Système de réglage pour un moteur à réluctance commuté, actionnant comme un générateur de puissance
WO1996010286A1 (fr) * 1994-09-29 1996-04-04 Sundstrand Corporation Systeme de commande de demarreur/generateur a reluctance commute autorisant un fonctionnement avec des charges d'entretien et systeme electrique utilisant ce systeme
EP0777309A2 (fr) * 1995-12-05 1997-06-04 Denso Corporation Générateur électrique pour véhicule
WO1997039522A1 (fr) * 1996-04-12 1997-10-23 Emerson Electric Co. Procede et dispositif ameliores pour commander un moteur a reluctance commute

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399146A1 (fr) * 1989-05-09 1990-11-28 General Electric Company Système de réglage pour un moteur à réluctance commuté, actionnant comme un générateur de puissance
WO1996010286A1 (fr) * 1994-09-29 1996-04-04 Sundstrand Corporation Systeme de commande de demarreur/generateur a reluctance commute autorisant un fonctionnement avec des charges d'entretien et systeme electrique utilisant ce systeme
EP0777309A2 (fr) * 1995-12-05 1997-06-04 Denso Corporation Générateur électrique pour véhicule
WO1997039522A1 (fr) * 1996-04-12 1997-10-23 Emerson Electric Co. Procede et dispositif ameliores pour commander un moteur a reluctance commute

Non-Patent Citations (2)

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Title
DATABASE INSPEC [online] Database accession no. 7048604 *
DE VRIES A.: "A switched reluctance machine for a car stateralternator system", ELECTRIC MACHINES AND DRIVES CONFERENCE, 2000, pages 323 - 328, XP002960592 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8942013B2 (en) 2013-02-21 2015-01-27 Pratt & Whitney Canada Corp. Over voltage protection for electric machines

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