CA1191186A - Rotating electric machine - Google Patents
Rotating electric machineInfo
- Publication number
- CA1191186A CA1191186A CA000425293A CA425293A CA1191186A CA 1191186 A CA1191186 A CA 1191186A CA 000425293 A CA000425293 A CA 000425293A CA 425293 A CA425293 A CA 425293A CA 1191186 A CA1191186 A CA 1191186A
- Authority
- CA
- Canada
- Prior art keywords
- rotor
- stator
- windings
- rotary
- rotation
- 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.)
- Expired
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- Synchronous Machinery (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A rotating electric machine comprising a stator and a rotor which is adapted to be rotated about an axis and which is disposed opposite said stator. Normally, the magnetic field of the rotor is excited by a direct current which is supplied via sliding contacts. In order to avoid wear of the sliding contacts, the invention employs the measure that the exciting current for the magnetic field of the rotor is supplied via a second stator and a second rotor by means of induction.
A rotating electric machine comprising a stator and a rotor which is adapted to be rotated about an axis and which is disposed opposite said stator. Normally, the magnetic field of the rotor is excited by a direct current which is supplied via sliding contacts. In order to avoid wear of the sliding contacts, the invention employs the measure that the exciting current for the magnetic field of the rotor is supplied via a second stator and a second rotor by means of induction.
Description
1 The p:resellt :i.nv~nt:i.on relcltec; to a rotatiny electric machine according to the gener:ic clause of -the rna:in claim.
A rotating electr:ic machine of the type mentioned hereinbe~ore is known :Erom its use as synchronous rotary current generator. In the case of.such a synchronous rotary current generator the stator has provided thereon three stator windings.disposed on a circle round the a~is and off-set by 120 with respect to one another. The rotor, which is adapted to be rotated about the axis and which is disposed opposite the stator, has provided thereon a direct-current winding. The direct current flowing through said rotor winding generates a constant magnetic field rotating with the rotor. Due to the time-dependent change in the magnetic 1.5 -flu~ flowing through the stator w.indings a voltage is induced in the stator windings. When a connection to a rotary current load or to a rotary current mains supply is esta blished, a rotary current flows through the stator windi.ngs so that the load or the mains supply is supplied with active power~ In view of the fact that the rotor rotates, the exciting current must be supplied to the rotor winding via sliding contacts. Such a rotating electric machine shows the disadvantage that, due to the high electrical and mechanical loads occurring, the sliding contacts will be worn~out after a short period o~f time so that said sliding contacts are constantl~ in need of maintenance.
The present invention is based on the task of pro-viding a rotating electric machine of the type mentioned 3~
1 hereinbefore, which can be opercl-ted w.ithou-t any use of sl:iding contacts and which, consequently, avoids the above-men-tioned disadvantayes of the known struc-tural design.
This task is solved by providing a rotating electric machine of -the above-mentioned -type which comprises a rotating electric machine comprising a stator and a rotor disposed opposite said stator and rotatable about an axis, and further comprising a number N of stator windings disposed on said stator on a circle round the axis at uniform distarlces from one another, characterized in that the rotor has provided thereon a number N of rotor windings disposed on a circle round the axis at uniform distances from one another and used for exciting a magnetic field, said nwnber N of rotor windings corresponding to said number N of stator windings, that a second rotor is connected to said first rotor and rotates at the speed of rotation of said fi.rst rotor about the axis thereof, that said second rotor has provided thereon a number N of rotor windings disposed on a circle round the axis at uniform di.stances from one another, said number N of rotor windin~s.corresponding to said number N of stator windings, that when the rotor windings of each rotor are referred to by a series of reference numbers n = 1,2, ... N, the first rotor winding of the first rotor is connected to the first rotor winding of ~5 the second rotor and that, as far as the other rotor windings are concerned, the nth rotor winding of the first rotor is connected to the [N + 2 - n]th rotor winding of the second ,1 rotor 90 -that tlle xotary :Ei.elcls at the two roLors have opposite directions oE rotation w,i.th recJard to said rotors, that a second stator is provided for the second rotor, and that said second s-tator has prov.idecl thereon a number N of stator windings disposed on a circle round the axis at unl-form distances from one another, said number N of stator windings of said second stator corresponding to said number N of stator windings of said first stator.
Among other advantages, the rotating electric machine according to the invention shows the followiny ~dvantages The machine can be excited by supplyiny rotary current to the windings 1~, 15, 16 of the second stator 13.
The machine can also be excited by supplying direct , ; 15 -current to one of the windings 14, 15, 16 of the stator 13.
When used as a ~enerator, the machine can have it output frequency influenced, since said output frequency consists of the negative rotational frequency of the rotary field applied to the second stator 13 and of twiae the rotational frequency of the rotor.
When the machine is used as a motor, the speed of rotation of the rotors 5, 9 can be adjusted due to the fact that it is half the sum of the speeds of rotation of the rotational speed of the rotary field applied to the first stator 1 and of the rotary field applied to the second stator 13.
The construction of this machine does not require any special components so that the machine can be produced 1 by emp:loy:incJ the p:roduct:i.on m~ns of any Eactory corl-structing e:l.ectric machlnes.
.~n advantageous development oE the rotatincJ
elec-tric machi.ne according to the invention for use as a generator is disclosed in claim 2. Adapting the frequency and the phase position of the rotary voltage i.nduced in the windings 2, 3, 4 of the first stator 1 to predetermined nominal values is one of the fundamental problems in the field of generator technology. Such an adaptation is par-ticularly necessary in cases in ~hich a generator has to supply power to a mains which is already supplied with power by other generators. Normally, complicated mechanical control means are provided for controlling these quantities, said control means influencing the speed and the phase ; 15 position of the rotor. In the case of the rotating electric machine according to the invention for.use as a generator, as indicated in claim 2, this problem ;.s solved in a simple manner by the feature that the frequency and the phase position of the rotary current, which is suppl:ied to the windings 14/ 15, 16 of the stator 13, are controlled in such a way that, in spite of changes in the speed of rotation of the rotors 5, 9, a constant phase and frequency of the rotary voltage induced in the windings 2, 3, 4 of the first stator 1 is maintained.
A further development of the rotating electric machine according to the invention for use as a generator is disclosed in claim 3. By means of the controlled system indicated in said claim it is achieved that the amplitude of 3~6 1 -the ro-tary voltacJe ind~lced in the windln~s 2, 3, ~ of the first sta-tor 1 xe~mains constant i.n a load-independent manner wi.thin the power ranye of the generator.
A further advantageous developmen-t of the ro-tating electric machine according to the invention for use as a motor is disclosed in claim ~. Normally, ln the case of synchronous motors the difficulty occurs that a starting motor is re~uired for starting these machines, since latching.or synchronizing of the motor speed is only possible when the motor rotates at approximately the same rotational speed as the rotary magnetic field generated by the rotary c~l.rrent flowing in the windings 2, 3, 4 of the first stator 1. The structural design oE a motor disclosed in claim ~
eliminates the necessity of provi.diny a sta.rting motor as - 15 - well as the problem of synchronous latch;.ng of the motor.
In view of the fact that the rotational speed .results from half the sum of the rotational spee~s of the rotary fields generated by the currents in the windings 6, 7, 8; 14, 15, 16 of the stators 1, 13, the starting operation can e.g. simply be effected by employiny the measure that, at first, the `field at the second stator 13 rotates at the same, but oppositely directed rotational speed as the field at the first stator 1. In response.to a slow change in the rotational speed of the field at the second stator 13 the rotor 5, 9 starts to rotate. This, too, is a possible way of adjusting any desired speed of.rotation of the rotors 5, 9, in spite of the synchronous mode of operation.
1 One eml)ocl:iment of the rotal,irl~J e:l,ectric mach:ine according -to the ,invention wi:Ll he clescribed herelnaE-ter on the basis o~ the drawing, in which:
Fig. 1 is a schematic representation of the ~Jinding arrangement, and Fig. 2 is a schematic representation of a speed-and amplitude-controlled rotary current generator provided with the wi,nding arrangement shown in Fig. 1.
The special case (N = 3) shown in the figures will be the most commom form of application, since this is the conventional three-phase rotary current system. A first stator 1 has provided thereon three stator windings 2, 3, 4 disposed on a circle round an axis and oEEset by 120 with respec-t to one another~ A rotor 5, which is adapted to be ! 15 rotated ahout the axis, is disposed opposite the stator.
Said rotor has provided thereon three rotor windings 6, 7, 8 which are disposed on a circle round the axis thereof and offset by 120 with respect to one another and which are used for exciting a magnetic Eield. A second rotor 9 is ~ixedly connected to said first rotor 5 and rotates at the speed of rotation of said first rotor 5 about the axis thereof. The connection between the two rotors 5, 9 can be effected by an axis by means of which the rotors 5, 9 are supported. The second rotor 9 has provided thereon three rotor windings 10, 11, 12 disposed on a circle round the axis and off set by 120 with respect to one another. The first rotor winding 6 of the first rotor 5 is connected to the first rotor winding 10 of the second rotor 9. The second rotor winding 7 1 o:E the :E:i.rst rotox 5 :is connected to t.he th:ird rotor windiny 12 oE the seconcl roto:r 9. The thi.r(l ro-tor winding ~ of -the Eirs-t ro-to.r 5 is connecteA to -the second rotor winding 11 of the second rotor 9. A second stator 13 is disposed opposite the second rotor 9. Said second stator 13 has provlded thereon three stator windings 14, 15, 16 disposed on a circle round the axis and offset by 120 wi-th r~spect to one another.
Fig. 2 shows the ahove described rotating eleccric machine when used as a generator. The speed of rotation of the rotors 5, 9 is determined by a measuring means. The measuring means consists of a circulating permanent magnet 22 and of a stationary induction coil. A control means 18 controls the frequenc~ and phase of an exciting current - generator 21. It is thus achieved that, when the speed of rotation and the rotary phase of the rotors 5, 9 deviate from th~ir nominal speed of rotation and nominal phase, the speed of rotation and the rotary phase o~ an input rotary field, : which is generated by an exciting rotar~ current flowing in the stator winding 1~, 15, 16 of the second stator 13,is readjusted such that the frequency and phase position of the rotary voltage induced in the w;.ndings 2, 3, ~ of the first stator 1 main-tains predetermined nominal values. In the case of low power levels the exciting current generator may be designed as a solid-state circuit. In the case of higher power levels the exciting current generator could consist of an additional generator, as shown in Fig~ 2, which precedes this generator, said preceding generator being ~3~L~
1 :in turn Eed by a sol:id-stclte e~clt:incJ current generator.
A second measuring Ifleans 19 taps v:ia an :incluctive coupling -the voltage amplitude of the rotary vo:ltaye :induced in -the ~indi~gs 2, 3, 4 oE the first stator 1. A second control means 20 contro:Ls the ampll-tude of the exciting current, which flows through the stator windings 14, 15, 16 of the second sta-tor 13, such that the amplitude of the rotary voltage induced in the windings 2, 3, 4 of the first stator 1 remains constant in a load-independent manner within the power range of the generator. In the case of an increase in the load, i.e. when the amplitude of the rotary voltage appli~d to the wind:ings 2, 3, 4 of the first stator 1 decreases, the measuring means 19 will measure the voltage drop and impart this information to the control means 20 which, in turn, will increase the amplitude of the e~citing rotary curren-t supplied to the windings 14, 15, 16 of the stator 13. It is a matter of course that not even such a controlled system will be capable of increasing the power range of a generator, bu-t the only thing which can be achieved ~o is a constant output voltage of the generator even in the case of varying loads, as long as the maximum load on the generator is not exceeded. The control means 20 for controlling the amplitude can also be designed as a solid-state circuit, as long as the exciting current required has only small or medium values. In view of the fact that in the case of high power requirements a cascade connection of the generators is necessary not least for purposes of frequenc~ control, it will also in this case be possible to 3~
1 cleskJ~ he respective~ f:i.rst excit:i.nCJ generator as a solid-sta-te circuit.
The invention is not limited to the three-phase rotary current system. The rotating electric mach:ine accord-ing to the invention can be used in N~phase :rotary currentsystems in an equally advantayeous manner. And it is also possible to supply only a single winding 14, 15, 16 of the second stator 13 with a direct current serving to excite the rotary current generator or the rotary current motor.
In this case the other two windings of th~ second stator 13 will be superfluous. It is also possible to u.se the windings 14, 15, 16 simultaneously as a measuring means 17 for measuring the speed of rotation of the rotors 5, 9. When the the rotor is driven hy a synchronous motor, the electric - 15 -machine according to the invention can also be used Eor trans~ittiny power frorn a first :rotary current mains supply h~ving a first frequency to a second rotary current mains supply having a second :Erequency.
A rotating electr:ic machine of the type mentioned hereinbe~ore is known :Erom its use as synchronous rotary current generator. In the case of.such a synchronous rotary current generator the stator has provided thereon three stator windings.disposed on a circle round the a~is and off-set by 120 with respect to one another. The rotor, which is adapted to be rotated about the axis and which is disposed opposite the stator, has provided thereon a direct-current winding. The direct current flowing through said rotor winding generates a constant magnetic field rotating with the rotor. Due to the time-dependent change in the magnetic 1.5 -flu~ flowing through the stator w.indings a voltage is induced in the stator windings. When a connection to a rotary current load or to a rotary current mains supply is esta blished, a rotary current flows through the stator windi.ngs so that the load or the mains supply is supplied with active power~ In view of the fact that the rotor rotates, the exciting current must be supplied to the rotor winding via sliding contacts. Such a rotating electric machine shows the disadvantage that, due to the high electrical and mechanical loads occurring, the sliding contacts will be worn~out after a short period o~f time so that said sliding contacts are constantl~ in need of maintenance.
The present invention is based on the task of pro-viding a rotating electric machine of the type mentioned 3~
1 hereinbefore, which can be opercl-ted w.ithou-t any use of sl:iding contacts and which, consequently, avoids the above-men-tioned disadvantayes of the known struc-tural design.
This task is solved by providing a rotating electric machine of -the above-mentioned -type which comprises a rotating electric machine comprising a stator and a rotor disposed opposite said stator and rotatable about an axis, and further comprising a number N of stator windings disposed on said stator on a circle round the axis at uniform distarlces from one another, characterized in that the rotor has provided thereon a number N of rotor windings disposed on a circle round the axis at uniform distances from one another and used for exciting a magnetic field, said nwnber N of rotor windings corresponding to said number N of stator windings, that a second rotor is connected to said first rotor and rotates at the speed of rotation of said fi.rst rotor about the axis thereof, that said second rotor has provided thereon a number N of rotor windings disposed on a circle round the axis at uniform di.stances from one another, said number N of rotor windin~s.corresponding to said number N of stator windings, that when the rotor windings of each rotor are referred to by a series of reference numbers n = 1,2, ... N, the first rotor winding of the first rotor is connected to the first rotor winding of ~5 the second rotor and that, as far as the other rotor windings are concerned, the nth rotor winding of the first rotor is connected to the [N + 2 - n]th rotor winding of the second ,1 rotor 90 -that tlle xotary :Ei.elcls at the two roLors have opposite directions oE rotation w,i.th recJard to said rotors, that a second stator is provided for the second rotor, and that said second s-tator has prov.idecl thereon a number N of stator windings disposed on a circle round the axis at unl-form distances from one another, said number N of stator windings of said second stator corresponding to said number N of stator windings of said first stator.
Among other advantages, the rotating electric machine according to the invention shows the followiny ~dvantages The machine can be excited by supplyiny rotary current to the windings 1~, 15, 16 of the second stator 13.
The machine can also be excited by supplying direct , ; 15 -current to one of the windings 14, 15, 16 of the stator 13.
When used as a ~enerator, the machine can have it output frequency influenced, since said output frequency consists of the negative rotational frequency of the rotary field applied to the second stator 13 and of twiae the rotational frequency of the rotor.
When the machine is used as a motor, the speed of rotation of the rotors 5, 9 can be adjusted due to the fact that it is half the sum of the speeds of rotation of the rotational speed of the rotary field applied to the first stator 1 and of the rotary field applied to the second stator 13.
The construction of this machine does not require any special components so that the machine can be produced 1 by emp:loy:incJ the p:roduct:i.on m~ns of any Eactory corl-structing e:l.ectric machlnes.
.~n advantageous development oE the rotatincJ
elec-tric machi.ne according to the invention for use as a generator is disclosed in claim 2. Adapting the frequency and the phase position of the rotary voltage i.nduced in the windings 2, 3, 4 of the first stator 1 to predetermined nominal values is one of the fundamental problems in the field of generator technology. Such an adaptation is par-ticularly necessary in cases in ~hich a generator has to supply power to a mains which is already supplied with power by other generators. Normally, complicated mechanical control means are provided for controlling these quantities, said control means influencing the speed and the phase ; 15 position of the rotor. In the case of the rotating electric machine according to the invention for.use as a generator, as indicated in claim 2, this problem ;.s solved in a simple manner by the feature that the frequency and the phase position of the rotary current, which is suppl:ied to the windings 14/ 15, 16 of the stator 13, are controlled in such a way that, in spite of changes in the speed of rotation of the rotors 5, 9, a constant phase and frequency of the rotary voltage induced in the windings 2, 3, 4 of the first stator 1 is maintained.
A further development of the rotating electric machine according to the invention for use as a generator is disclosed in claim 3. By means of the controlled system indicated in said claim it is achieved that the amplitude of 3~6 1 -the ro-tary voltacJe ind~lced in the windln~s 2, 3, ~ of the first sta-tor 1 xe~mains constant i.n a load-independent manner wi.thin the power ranye of the generator.
A further advantageous developmen-t of the ro-tating electric machine according to the invention for use as a motor is disclosed in claim ~. Normally, ln the case of synchronous motors the difficulty occurs that a starting motor is re~uired for starting these machines, since latching.or synchronizing of the motor speed is only possible when the motor rotates at approximately the same rotational speed as the rotary magnetic field generated by the rotary c~l.rrent flowing in the windings 2, 3, 4 of the first stator 1. The structural design oE a motor disclosed in claim ~
eliminates the necessity of provi.diny a sta.rting motor as - 15 - well as the problem of synchronous latch;.ng of the motor.
In view of the fact that the rotational speed .results from half the sum of the rotational spee~s of the rotary fields generated by the currents in the windings 6, 7, 8; 14, 15, 16 of the stators 1, 13, the starting operation can e.g. simply be effected by employiny the measure that, at first, the `field at the second stator 13 rotates at the same, but oppositely directed rotational speed as the field at the first stator 1. In response.to a slow change in the rotational speed of the field at the second stator 13 the rotor 5, 9 starts to rotate. This, too, is a possible way of adjusting any desired speed of.rotation of the rotors 5, 9, in spite of the synchronous mode of operation.
1 One eml)ocl:iment of the rotal,irl~J e:l,ectric mach:ine according -to the ,invention wi:Ll he clescribed herelnaE-ter on the basis o~ the drawing, in which:
Fig. 1 is a schematic representation of the ~Jinding arrangement, and Fig. 2 is a schematic representation of a speed-and amplitude-controlled rotary current generator provided with the wi,nding arrangement shown in Fig. 1.
The special case (N = 3) shown in the figures will be the most commom form of application, since this is the conventional three-phase rotary current system. A first stator 1 has provided thereon three stator windings 2, 3, 4 disposed on a circle round an axis and oEEset by 120 with respec-t to one another~ A rotor 5, which is adapted to be ! 15 rotated ahout the axis, is disposed opposite the stator.
Said rotor has provided thereon three rotor windings 6, 7, 8 which are disposed on a circle round the axis thereof and offset by 120 with respect to one another and which are used for exciting a magnetic Eield. A second rotor 9 is ~ixedly connected to said first rotor 5 and rotates at the speed of rotation of said first rotor 5 about the axis thereof. The connection between the two rotors 5, 9 can be effected by an axis by means of which the rotors 5, 9 are supported. The second rotor 9 has provided thereon three rotor windings 10, 11, 12 disposed on a circle round the axis and off set by 120 with respect to one another. The first rotor winding 6 of the first rotor 5 is connected to the first rotor winding 10 of the second rotor 9. The second rotor winding 7 1 o:E the :E:i.rst rotox 5 :is connected to t.he th:ird rotor windiny 12 oE the seconcl roto:r 9. The thi.r(l ro-tor winding ~ of -the Eirs-t ro-to.r 5 is connecteA to -the second rotor winding 11 of the second rotor 9. A second stator 13 is disposed opposite the second rotor 9. Said second stator 13 has provlded thereon three stator windings 14, 15, 16 disposed on a circle round the axis and offset by 120 wi-th r~spect to one another.
Fig. 2 shows the ahove described rotating eleccric machine when used as a generator. The speed of rotation of the rotors 5, 9 is determined by a measuring means. The measuring means consists of a circulating permanent magnet 22 and of a stationary induction coil. A control means 18 controls the frequenc~ and phase of an exciting current - generator 21. It is thus achieved that, when the speed of rotation and the rotary phase of the rotors 5, 9 deviate from th~ir nominal speed of rotation and nominal phase, the speed of rotation and the rotary phase o~ an input rotary field, : which is generated by an exciting rotar~ current flowing in the stator winding 1~, 15, 16 of the second stator 13,is readjusted such that the frequency and phase position of the rotary voltage induced in the w;.ndings 2, 3, ~ of the first stator 1 main-tains predetermined nominal values. In the case of low power levels the exciting current generator may be designed as a solid-state circuit. In the case of higher power levels the exciting current generator could consist of an additional generator, as shown in Fig~ 2, which precedes this generator, said preceding generator being ~3~L~
1 :in turn Eed by a sol:id-stclte e~clt:incJ current generator.
A second measuring Ifleans 19 taps v:ia an :incluctive coupling -the voltage amplitude of the rotary vo:ltaye :induced in -the ~indi~gs 2, 3, 4 oE the first stator 1. A second control means 20 contro:Ls the ampll-tude of the exciting current, which flows through the stator windings 14, 15, 16 of the second sta-tor 13, such that the amplitude of the rotary voltage induced in the windings 2, 3, 4 of the first stator 1 remains constant in a load-independent manner within the power range of the generator. In the case of an increase in the load, i.e. when the amplitude of the rotary voltage appli~d to the wind:ings 2, 3, 4 of the first stator 1 decreases, the measuring means 19 will measure the voltage drop and impart this information to the control means 20 which, in turn, will increase the amplitude of the e~citing rotary curren-t supplied to the windings 14, 15, 16 of the stator 13. It is a matter of course that not even such a controlled system will be capable of increasing the power range of a generator, bu-t the only thing which can be achieved ~o is a constant output voltage of the generator even in the case of varying loads, as long as the maximum load on the generator is not exceeded. The control means 20 for controlling the amplitude can also be designed as a solid-state circuit, as long as the exciting current required has only small or medium values. In view of the fact that in the case of high power requirements a cascade connection of the generators is necessary not least for purposes of frequenc~ control, it will also in this case be possible to 3~
1 cleskJ~ he respective~ f:i.rst excit:i.nCJ generator as a solid-sta-te circuit.
The invention is not limited to the three-phase rotary current system. The rotating electric mach:ine accord-ing to the invention can be used in N~phase :rotary currentsystems in an equally advantayeous manner. And it is also possible to supply only a single winding 14, 15, 16 of the second stator 13 with a direct current serving to excite the rotary current generator or the rotary current motor.
In this case the other two windings of th~ second stator 13 will be superfluous. It is also possible to u.se the windings 14, 15, 16 simultaneously as a measuring means 17 for measuring the speed of rotation of the rotors 5, 9. When the the rotor is driven hy a synchronous motor, the electric - 15 -machine according to the invention can also be used Eor trans~ittiny power frorn a first :rotary current mains supply h~ving a first frequency to a second rotary current mains supply having a second :Erequency.
Claims (4)
- Claim 1 continued....
rotors, that a second stator is provided for the second rotor, and that said second stator has provided thereon a number N of stator windings disposed on a circle round the axis at uniform distances from one another, said number N
of stator windings of said second stator corresponding to said number N of stator windings of said first stator. - 2. A rotating electric machine according to claim 1, for use as a generator, characterized by a measuring means for determining the speed of rotation of the rotors and a con-trol means for controlling an exciting current generator, said control means being used, when the speed of rotation and the rotary phase of the rotors deviate from their nominal speed of rotation and nominal phase, for readjusting the speed of rotation and the rotary phase of an input rotary field, which is generated by an exciting rotary current flowing in said stator winding of said second stator, such that the frequency and phase position of the rotary voltage induced in the windings of the first stator maintains predetermined nominal values.
3. A rotating electric machine according to claim 2, characterized by a second measuring means for measuring the voltage amplitude of the rotary voltage induced in the windings of the first stator and a second control means for controlling the amplitude of the exciting rotary current, which flows through the stator windings of the second stator, such that the amplitude of the rotary voltage - Claim 3 continued...
induced in the windings of the first stator remains constant in a load independent manner within the power range of the generator. - 4. A rotating electric machine according to claim 1, for use as a motor, characterized by a means for regulating or controlling the speed of rotation of the exciting rotary current flowing in said second stator, said means being designed such that the speed of rotation of the rotors can be continuously adjusted by adjusting the sum of the speeds of rotation of the rotary magnetic field generated by the exciting rotary current in the windings of the first rotor and of the rotary magnetic field generated by the rotary current flowing in the windings of the first stator.
1. A rotating electric machine comprising a stator and a a rotor disposed opposite said stator and rotatable about an axis, and further comprising a number N of stator windings disposed on said stator on a circle round the axis at uniform distances from one another, characterized in that the rotor has provided thereon a number N of rotor windings disposed on a circle round the axis at uniform distances from one another and used for exciting a magnetic field, said number N of rotor windings corresponding to said number N of stator windings, that a second rotor is connected to said first rotor and rotates at the speed of rotation of said first rotor about the axis thereof, that said second rotor has provided thereon a number N of rotor windings disposed on a circle round the axis at uniform distances from one another, said number N of rotor windings corresponding to said number N of stator windings, that, when the rotor windings of each rotor are referred to by a series of reference numbers n = 1,2, ...N, the first rotor winding of the first rotor is connected to the first rotor winding of the second rotor and that, as far as the other rotor windings are concerned, the nth rotor winding of the first rotor is connected to the [N + 2 - n]th rotor winding of the second rotor so that the rotary fields at the two rotors have opposite directions of rotation with regard to said
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000425293A CA1191186A (en) | 1983-04-06 | 1983-04-06 | Rotating electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000425293A CA1191186A (en) | 1983-04-06 | 1983-04-06 | Rotating electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1191186A true CA1191186A (en) | 1985-07-30 |
Family
ID=4124947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425293A Expired CA1191186A (en) | 1983-04-06 | 1983-04-06 | Rotating electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1191186A (en) |
-
1983
- 1983-04-06 CA CA000425293A patent/CA1191186A/en not_active Expired
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