CN112737257A - Composite rotor modulation type double-stator brushless double-fed motor - Google Patents
Composite rotor modulation type double-stator brushless double-fed motor Download PDFInfo
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- CN112737257A CN112737257A CN202110086222.XA CN202110086222A CN112737257A CN 112737257 A CN112737257 A CN 112737257A CN 202110086222 A CN202110086222 A CN 202110086222A CN 112737257 A CN112737257 A CN 112737257A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
Abstract
The invention discloses a composite rotor modulation type double-stator brushless double-fed motor, which comprises an outer stator, an inner stator and a cup-shaped rotor arranged between the inner stator and the outer stator, wherein an outer air gap is arranged between the outer stator and the rotor, an inner air gap is arranged between the rotor and the inner stator, and the outer stator consists of an outer stator iron core and p embedded in an outer stator groovepA counter power winding; the inner stator comprises an inner stator iron core and p embedded in the inner stator slotcA counter control winding, and pcAnd ppNot equal. Compared with the traditional single-stator brushless double-fed motor, the brushless double-fed motor has the advantages that variable-speed constant-frequency power generation is realized by brushing, the cavity in the single-stator structure is utilized, the two sets of windings are isolated in space, the insulation requirement is reduced, the saturation degree is reduced, the double-air-gap structure enables the electromagnetic load limit of a single pole logarithmic winding to be reduced, and the harmonic frequency is reducedThe wave content is reduced, and the power density is improved; compared with a double-stator winding type rotor brushless double-fed motor, the rotor structure is simpler and more reliable, the processing is easy, the rotor resistance is greatly reduced, and the efficiency is improved.
Description
Technical Field
The invention relates to a brushless double-fed motor, in particular to a composite rotor modulation type double-stator brushless double-fed motor.
Background
With the continuous and rapid growth of Chinese economy, stable energy supply becomes an important support for the development of economic society. In recent years, non-renewable energy is increasingly exhausted, resource and environmental constraints are increased, and the search for clean energy supply becomes a key for solving resource and environmental problems. The wind power industry of China gradually develops from low end to high technology, high level and high quality due to the national importance and the precipitation and accumulation of a plurality of scientific research workers.
The brushless double-fed motor is a novel motor developed in recent years, and has the advantages of simple and reliable rotor structure, low capacity of a frequency converter, variable-speed constant-frequency constant-voltage power generation and the like due to the advantages of an asynchronous motor and a synchronous motor, so that the brushless double-fed motor is very suitable for wind power generation and is particularly suitable for offshore wind power generation. The brushless double-fed motor can be divided into a cascade type and a modulation type according to different principles. The magnetic field modulation type brushless double-fed motor realizes magnetic field modulation by utilizing a special rotor structure, plays a role of a pole number converter, thereby coupling two sets of windings and realizing synchronous double-fed power generation operation. In order to improve the performance of the motor, experts and scholars make a great deal of research on the improvement of a rotor structure, and the motors have certain achievements, but the motors focus on the structure of a single stator, the air gap harmonic wave can be reduced by improving the rotor structure, and the modulation capability is improved, but the megawatt level is developed, the space of the inner cavity of the rotor is wasted due to the large diameter-length ratio, two sets of stator windings with different pole pairs share one stator core, the electromagnetic load of the single pole pair winding is limited, the power density of the whole motor is low, and meanwhile, two windings are arranged in one stator slot, so that the manufacturing difficulty and the insulation requirement are increased. In the traditional cascading brushless doubly-fed generator, two motors are coaxially cascaded, so that the axial length is too long, and the development of the traditional cascading brushless doubly-fed generator is limited in application occasions with requirements on the volume.
In order to fully utilize the internal space of the motor, the double-stator winding type brushless double-fed motor is provided, the motor is essentially in a cascade type, the rotor structure is complex, the double-stator winding type brushless double-fed motor is divided into an outer rotor, an inner rotor and a magnetic isolation ring between the outer rotor and the inner rotor, windings are embedded in the inner rotor and the outer rotor, one end of each winding is in short circuit, the other end of each winding is in reverse phase sequence connection, the processing and manufacturing difficulty is high, the winding type rotor is large in resistance, the copper consumption.
Disclosure of Invention
The invention aims to provide a composite rotor modulation type double-stator brushless double-fed motor which has a simpler and more reliable cup-shaped rotor structure while having an inner stator and an outer stator; compared with the traditional single-stator brushless double-fed motor, the brushless double-fed motor has the advantages that the variable-speed constant-frequency power generation is realized by brushing, the cavity in the single-stator structure is utilized, the two sets of windings are isolated in space, the insulation requirement is reduced, the saturation degree is reduced, the double-air-gap structure enables the electromagnetic load limit of a single pole logarithmic winding to be reduced, the harmonic content is reduced, and the power density is improved; compared with a double-stator winding type rotor brushless double-fed motor, the rotor structure is simpler and more reliable, the processing is easy, the rotor resistance is greatly reduced, and the efficiency is improved.
The purpose of the invention can be realized by the following technical scheme:
a composite rotor modulation type double-stator brushless double-fed motor comprises an outer stator, an inner stator and a cup-shaped rotor arranged between the inner stator and the outer stator, wherein an outer air gap is formed between the outer stator and the rotor, an inner air gap is formed between the rotor and the inner stator, the outer stator comprises an outer stator iron core and p embedded in an outer stator groovepA counter power winding; the inner stator comprises an inner stator iron core and p embedded in the inner stator slotcA counter control winding, and pcAnd ppNot equal;
a composite rotor is arranged between the outer stator and the inner stator, the composite rotor is of a cup-shaped structure, and the equivalent pole pair number is prThe two sides of the iron core near the inner and outer air gaps along the radial center line of the rotor slot are provided with small openings, and the iron core is composed of two parts, wherein the first part is a simple salient pole modulator formed by slot openings, the second part is a short circuit coil modulator embedded in the rotor slot, and the short circuit coil modulator is composed of prEach nest is composed of N short-circuit loop circuits, each loop circuit is formed by connecting short-circuit loop cage bars in rotor slots through end parts, the end parts are provided with two sides, and the short-circuit loop circuit in each nest is provided with different cage bars on the two sidesThe ends and the presence or absence of common cage bars provide a variety of connection means.
Furthermore, the short-circuit loop modulator in the composite rotor has various short-circuit loop connection modes in each nest, including no common end ring and common cage bars, no common cage bars with the common end ring, equidistant short-circuit coils and series short-circuit coils; the medium-distance short circuit coil and the series short circuit coil are not provided with a common cage bar in the connection mode.
Further, the short-circuit coil modulator in the composite rotor has a nest number of prThe number of short circuit coil loops in each nest is N, and the number of all cage bars in the rotor is related to the number of nests, the number of short circuit coil loops and the connection mode of short circuit rings; when the short-circuit rings are connected in a mode without common cage bars, the number of all cage bars in the rotor is 2Npr(ii) a When the short circuit ring is connected in a mode of having common cage bars, the number of all cage bars in the rotor is 2pr(N-1)。
Furthermore, the simple salient pole modulator in the composite rotor is caused by openings at two sides of an iron core of the simple salient pole modulator, which are close to an inner air gap and an outer air gap along the radial center line of a rotor slot, and the center line of a cage bar in the rotor slot and the center lines of the openings of the inner slot and the outer slot are on the same straight line, so that the number of the formed simple salient poles is the same as the number of all the cage bars in the rotor; when the short-circuit ring is connected in a mode without common cage bars, the number of the simple salient poles is 2Npr(ii) a When the short circuit ring is connected in a mode with common cage bars, the number of the simple salient poles is 2pr(N-1)。
Furthermore, each short circuit ring cage bar in the short circuit coil modulator in the composite rotor has a rectangular cross section and a height hrWidth of brAnd the cage bars in the rotor grooves are communicated with the end parts of the connecting cage bars by welding.
Further, the side slot opening close to the outer air gap is thetaorThe side slot opening near the inner air gap is thetair(ii) a The simple salient pole modulator in the rotor is an irregular magnet adjusting block and is provided with 4 yoke parts, and the height of the two yoke parts close to the inner air gap side and the outer air gap side is hs0Two yoke sections adjacent to the inner cage stripIs hs1(ii) a Other dimensions of the simple salient pole modulator in the rotor are determined according to the inner diameter and the outer diameter of the rotor and the dimensions of the short circuit ring cage bars.
Furthermore, the inner stator and the outer stator and the composite rotor in the middle have own magnetic field modulation mechanism according to a simplified air gap structure, and the equivalent magnetic conductance function of the ideal composite rotor is approximate to a form of reserving an average component and a first harmonic component, namely
According to the magnetic field modulation mechanism, the more the number of short-circuit loops is, the closer the equivalent air gap magnetic conductance function of the composite rotor is to the sine, and the better the modulation effect is.
Further, two operation modes of normal operation of the motor, namely 'difference modulation' and 'sum modulation', are derived according to the magnetic field modulation mechanism:
equivalent pole pair number p of motor rotor in two operation modesrWith steady-state speed omega of motorrThe formulas are required to be satisfied respectively. Equivalent pole pair number p of rotor in different modesrThat is, the number of the rotor short-circuit coil modulator nests needs to satisfy the first half of the formula to generate the harmonic wave of the correct space angular frequency, and the rotor rotation speed omegarThe latter half part of the formula needs to be satisfied to generate harmonic flux density with the same rotating speed as the magnetomotive force of the coupling winding, so as to induce induced electromotive force with the same frequency; the electric operation needs to meet the condition to adjust and control the frequency of the winding exciting current to regulate and regulate the speed, and the power generation operation is to adjust and control the frequency of the winding exciting current according to the condition under different rotating speeds to realize variable-speed constant-frequency operation.
The invention has the beneficial effects that:
compared with the traditional single-stator brushless double-fed motor, the brushless double-fed motor has the advantages that the variable-speed constant-frequency power generation is realized by brushing, the cavity in the single-stator structure is utilized, the two sets of windings are isolated in space, the insulation requirement is reduced, the saturation degree is reduced, the double-air-gap structure enables the electromagnetic load limit of a single pole logarithmic winding to be reduced, the harmonic content is reduced, and the power density is improved; compared with a double-stator winding type rotor brushless double-fed motor, the rotor structure is simpler and more reliable, the processing is easy, the rotor resistance is greatly reduced, and the efficiency is improved.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional view of a composite rotor modulated dual stator brushless doubly-fed machine of the present invention;
FIG. 2 is a schematic structural diagram of a composite rotor modulated double-stator brushless double-fed motor rotor according to the present invention;
FIG. 3 is a schematic diagram of different short-circuit ring connection modes of a composite rotor modulation type double-stator brushless double-fed motor rotor structure short-circuit coil modulator according to the present invention;
FIG. 4 is a schematic diagram showing the specific dimensions of a rotor part of a composite rotor modulated double-stator brushless doubly-fed motor according to the present invention;
FIG. 5 is a schematic diagram of the magnetic field modulation mechanism of the composite rotor modulated double-stator brushless double-fed motor of the present invention;
FIG. 6 is a schematic diagram of a) line voltage emitted from a power winding side and b) Fourier analysis of the line voltage when the composite rotor modulation type double-stator brushless double-fed motor of the invention is loaded at a rated load of 1250r/min at a highest rotation speed point;
FIG. 7 is a schematic diagram of the torque performance of the composite rotor modulated double stator brushless double motor at a maximum speed point of 1250r/min rated load according to the present invention;
FIG. 8 is a schematic diagram of a) line voltage emitted from a power winding side and b) Fourier analysis of the line voltage when the composite rotor modulation type double-stator brushless double-fed motor of the invention is in a rated load of 750r/min at a lowest rotation speed point;
FIG. 9 is a schematic diagram of the torque performance of the composite rotor modulated double-stator brushless doubly-fed motor at the lowest speed point of 750r/min rated load.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A composite rotor modulation type double-stator brushless double-fed motor comprises an outer stator, a rotor and an inner stator, as shown in figure 1, wherein the outer stator, the rotor and the inner stator are arranged concentrically, an outer air gap is formed between the outer stator and the rotor, and an inner air gap is formed between the rotor and the inner stator, and the composite rotor modulation type double-stator brushless double-fed motor is characterized in that the outer stator comprises an outer stator iron core 1 and p embedded in an outer stator groovepA counter power winding 2; the inner stator is composed of an inner stator iron core 4 and p embedded in the inner stator slotcA counter control winding 5. Like a single-stator brushless double-fed motor, the basic knowledge of the winding indicates that if p ispAnd pcEqual, then when p iscWhen the antipode control winding 5 is excited, non-zero induced electromotive force with the same frequency as the exciting current is generated in the power winding 2, and the two windings are directly coupled, so that the voltage frequency emitted by the power winding after being modulated by a rotor structure is influenced, and the variable-speed constant-frequency operation cannot be realized, therefore, the number p of pole pairs of the two windings ispAnd pcNot equal.
A composite rotor 3 is arranged between the outer stator and the inner stator, the composite rotor 3 is of a cup-shaped structure, and the equivalent pole pair number is prThe iron core has small openings at two sides near the inner and outer air gaps along the radial center line of the rotor slot, and comprises a simple salient pole modulator 32 with slot openings at the first part and a short circuit coil modulator 31 embedded in the rotor slot at the second part, wherein the short circuit coil modulator is composed of prEach nest 33 comprises N short-circuit loop circuits, each loop circuit is formed by connecting short-circuit loop cage bars 34 in rotor slots through end parts 35, the end parts 35 are provided with two sides, and the short-circuit loop circuit in each nest is formed by the short-circuit loop cage bars 34The different cage bar ends of both sides and whether there are common cage bars and there are many connection modes.
As shown in fig. 3, the shorting coil modulators 31 in the composite rotor 3 may have a variety of shorting loop connections (each indicated by a number of shorting loops of 3) in each nest 33, including but not limited to no common end ring and common cage bars, no common cage bars with a common end ring, common cage bars without a common end ring, common cage bars with a common end ring, equidistant shorting coils, series shorting coils, and so forth.
Short-circuit coil modulator 31 in the composite rotor 3, with nest number prThe number of short-circuit coil loops in each nest 33 is N, and the number of all the cage bars in the rotor is related to the number of nests, the number of short-circuit coil loops and the connection mode of the short-circuit rings, so that the number of all the cage bars in the composite rotor can be determined. When the short-circuit rings are connected in a mode without common cage bars, the number of all cage bars in the rotor is 2Npr(ii) a When the short circuit ring is connected in a mode of having common cage bars, the number of all cage bars in the rotor is 2pr(N-1)。
The simple salient pole modulator 32 in the composite rotor 3 is caused by openings at two sides of an iron core close to inner and outer air gaps along the radial center line of a rotor slot, and fig. 4 shows that the center line of a cage bar in the rotor slot and the center lines of the openings of the inner and outer slots are on the same straight line, so that the number of the formed simple salient poles is the same as the number of all the cage bars in the rotor. When the short-circuit ring is connected in a mode without common cage bars, the number of the simple salient poles is 2Npr(ii) a When the short circuit ring is connected in a mode with common cage bars, the number of the simple salient poles is 2pr(N-1)。
As shown in FIG. 4, each short-circuit ring cage bar 34 of the short-circuit coil modulator 31 in the composite rotor 3 has a rectangular cross section and a height hrWidth of brThe cage bars 34 in the rotor slots are in welded communication with the ends 35 of the connecting cage bars. FIG. 4 also shows that the specific dimensions of the simple salient pole modulator 32, the sizes of the inner and outer slot openings, and the like, may vary, with the slot opening near the outer air gap being θorThe side slot opening near the inner air gap is thetair(ii) a The simple salient-pole modulator 32 in the rotor 3 is a non-uniform magnetic modulating block having4 yoke parts, the two yoke parts 321 close to the inner and outer air gap sides have the height hs0The two yoke parts 322 close to the inner cage bars have a height hs1(ii) a Other dimensions of the simple salient pole modulator 32 in the rotor include the core height between the two yoke sections 322 near the inner cage and the length of the simple salient pole arc boundary between the inner and outer sides, etc., depending on the rotor inner and outer diameters and the dimensions of the short circuit ring cage 34.
FIG. 5 is a simplified schematic diagram of a magnetic field modulation mechanism of a composite rotor double-stator brushless doubly-fed generator, wherein dq axes, g, are marked by omitting small slots on the inner and outer stators and the inner and outer sides of the rotoraIs the air gap length, hmIs the rotor core thickness. Considering that the short-circuit ring has a damping effect on the change of the magnetic field, as known from the principle of minimum reluctance, the magnetic flux generated by the excitation current of the stator in the power generation operation can enter the rotor core along the d-axis to the core of the outer stator and then return to the inner stator along the other d-axis, but the magnetic flux generated by the winding current of the inner stator is difficult to enter the rotor from the q-axis because the magnetic flux generates induced electromotive force when crossing the short-circuit ring. The rotor cage bars have large cross section and small resistance and leakage inductance, so that large current can generate opposite magnetic flux to prevent the magnetic flux of the stator from passing through, and the effect similar to a magnetic barrier is achieved. Assuming ideal damping of the rotor short circuit ring, i.e. stator flux is completely inaccessible in the q-axis direction, the equivalent air gap permeance per unit area in this direction is mu0/(2ga+hm) Obviously, the equivalent ratio permeance of the air gap of the motor at the d-axis position is mu0/2gaThe resistance of the stator magnetic flux entering the rotor between the d axis and the q axis is increased along with the increase of the number of the crossed short circuit loops, so that an ideal composite rotor equivalent air gap to magnetic conductance function curve can be drawn, it is not difficult to see that the more the number of the short circuit loops is, the closer the composite rotor equivalent air gap to magnetic conductance function is to sinusoidal distribution, the better the modulation effect is, the dominant effect is the average component and the first-order harmonic component thereof, and therefore, the composite rotor equivalent air gap to magnetic conductance function curve can also be approximately expressed as the average component and the first-order harmonic
Wherein λ0、λ1Is constant and is related to the width of the rotor core with the air gap length and the number of the short circuit coil span layers; thetar0The included angle between the reference axis of the rotor and the phase axis of the power winding A is shown.
The simplified air gap flux guide obtained by the formula 1 is multiplied by the magnetomotive force of the power winding and the control winding on the inner stator and the outer stator to obtain the magnetic flux density of the inner air gap and the outer air gap, and in order to enable the two sets of windings to generate coupling, two possible schemes of rotor pole pair number matching and steady-state rotating speed, namely 'difference modulation' and 'sum modulation', are obtained by derivation:
wherein ω isp、ωc、ωrThe rotating magnetic field speed of the outer stator power winding, the rotating magnetic field speed controlled by the inner stator and the rotating speed of the motor rotor are respectively. Therefore, the pole pair number p of the power winding of the outer stator is properly proportionedpPole pair number p of control winding of internal statorcEquivalent pole pair number p of rotorrThe rotor has the function of a pole number converter under a steady-state specific rotating speed, and the two sets of windings are coupled to perform electromechanical energy conversion so as to realize double-fed operation.
The equivalent pole pair number of the rotor, namely the number of short-circuit coil modulator nests in the rotor, needs to meet the requirements of the first half parts of a formula 2 and a formula 3 to generate harmonic waves with correct spatial angular frequency, the rotating speed of the rotor needs to meet the second half parts of the formula 2 and the formula 3 to generate harmonic flux density which is the same as the rotating speed of magnetomotive force of a coupling winding, induced electromotive force with the same frequency is induced, electric operation needs to meet the condition, the exciting current frequency of the winding is adjusted and controlled to regulate speed, and power generation operation is to adjust and control the frequency of the exciting current of the winding according to the condition under different rotating speeds to realize variable-speed. In fact, in order to obtain larger electromagnetic torque, it is preferable to operate the motor in the mode shown in formula 3, i.e., "and modulate", and all the considerations of modulation and modulation are not specifically described in the present invention.
FIG. 1 shows an embodiment of the present invention, in which the number of pole pairs p of the outer stator winding isp2, pole pair number p of inner stator windingc1, equivalent pole pair number p of rotorrThe number of the short circuit coil modulator nests is 3, the number of the outer stator slots is 48, the number of the inner stator slots is 42, the number of the rotor short circuit loops is 5, and the short circuit loops are connected in a mode that a common end loop is provided without a common cage bar.
The working principle of the invention can be seen from formula 3, and the fan can change the rotating speed of the excitation rotating magnetic field by adjusting and controlling the frequency of the exciting current of the winding under a certain rotating speed, so that the induced electromotive force frequency of the outer stator power winding is a fixed value, and the variable-speed constant-frequency operation is conveniently realized. Fig. 6 and 7 show the rated load voltage and torque performance at the maximum rotation speed point 1250r/min according to the embodiment of the present invention, and it can be seen that the voltage quality is good, the effective value is 380V, the frequency is 50Hz, the distortion rate is 0.68%, and the torque is relatively stable; fig. 8 and 9 show the rated load voltage and torque performance at the lowest rotation speed point of 750r/min in the embodiment of the invention, and it can be seen that the voltage quality is also good and the torque is relatively stable.
Compared with the traditional single-stator brushless double-fed motor, the composite rotor double-stator brushless double-fed motor has the advantages that the variable speed, the constant frequency and the de-brushing can be realized, the cavity in the single-stator structure is utilized, the two sets of windings are isolated in space, the insulation requirement is reduced, the saturation degree is reduced, the electromagnetic load limit of a single pole pair winding is reduced due to the double-air-gap structure, the harmonic content is reduced, and the power density is improved; compared with a double-stator winding type rotor brushless double-fed motor, the rotor structure is simpler and more reliable, the processing is easy, the rotor resistance is greatly reduced, and the efficiency is improved.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (8)
1. A composite rotor modulation type double-stator brushless double-fed motor comprises an outer stator, an inner stator and a cup-shaped rotor arranged between the inner stator and the outer stator, wherein an outer air gap is formed between the outer stator and the rotor, and an inner air gap is formed between the rotor and the inner stator, and the composite rotor modulation type double-stator brushless double-fed motor is characterized in that the outer stator comprises an outer stator iron core (1) and p embedded in an outer stator groovepA counter power winding (2); the inner stator consists of an inner stator iron core (4) and p embedded in an inner stator slotcA counter control winding (5) and pcAnd ppNot equal;
a composite rotor (3) is arranged between the outer stator and the inner stator, the composite rotor (3) is of a cup-shaped structure, and the equivalent pole pair number is prThe iron core has small openings at two sides near the inner and outer air gaps along the radial center line of the rotor slot, and comprises a first part which is a simple salient pole modulator (32) formed by the slot opening and a second part which is a short circuit coil modulator (31) embedded in the rotor slot, wherein the short circuit coil modulator is composed of prEach nest (33) comprises N short circuit loop circuits, each loop circuit is formed by connecting short circuit loop cage bars (34) in a rotor groove through end parts (35), the end parts (35) are provided with two sides, and the short circuit loop circuits in each nest have various connection modes due to different cage bar end parts on the two sides and the existence of common cage bars.
2. The composite rotor modulated dual stator brushless doubly fed machine of claim 1, characterized by the shorted coil modulators (31) in the composite rotor (3) having multiple shorting ring loop connections in each nest (33), including no common end ring with common cage bars, equidistant shorted coils and series shorted coils; the medium-distance short circuit coil and the series short circuit coil are not provided with a common cage bar in the connection mode.
3. Composite rotor modulated double stator brushless doubly fed machine according to claim 1, characterized in that the number of shorted coil modulators (31), nest p, in the composite rotor (3)rThe number of short circuit coil loops in each nest is N, and the number of all cage bars in the rotor is related to the number of nests, the number of short circuit coil loops and the connection mode of short circuit rings; when the short-circuit rings are connected in a mode without common cage bars, the number of all cage bars in the rotor is 2Npr(ii) a When the short circuit ring is connected in a mode of having common cage bars, the number of all cage bars in the rotor is 2pr(N-1)。
4. A compound rotor modulated double stator brushless doubly fed machine according to claim 1, characterized in that the simple salient pole modulators (32) in said compound rotor (3) are caused by their cores being open on both sides near the inner and outer air gaps along the radial center line of the rotor slots, the center line of the cage bars (34) in the rotor slots being on the same line as the center line of the inner and outer slot openings, whereby the number of simple salient poles formed is the same as the number of all the cage bars in the rotor; when the short-circuit ring is connected in a mode without common cage bars, the number of the simple salient poles is 2Npr(ii) a When the short circuit ring is connected in a mode with common cage bars, the number of the simple salient poles is 2pr(N-1)。
5. Composite rotor modulated double stator brushless doubly fed machine according to claim 1, characterized in that each short circuit ring cage bar (34) in the short circuit coil modulator (31) in the composite rotor (3) is rectangular in cross section and has a height hrWidth of brThe cage bars (34) in the rotor slots are connected with the ends (35) of the cage bars byAnd (6) welding and communicating.
6. The compound-rotor modulated dual-stator brushless doubly-fed machine of claim 1, wherein slot opening on a side near the outer air gap is θorThe side slot opening near the inner air gap is thetair(ii) a The simple salient pole modulator (32) in the rotor is an irregular magnet adjusting block and is provided with 4 yoke parts, and the height of the two yoke parts (321) close to the inner air gap and the outer air gap is hs0The two yoke parts (322) close to the inner cage bars have the height hs1(ii) a Other dimensions of the simple salient pole modulator (32) in the rotor are determined according to the inner and outer diameters of the rotor and the dimensions of the short circuit ring cage bars (34).
7. The composite rotor modulated dual stator brushless doubly fed machine of claim 1, wherein the inner and outer stators and the intermediate composite rotor have their own field modulation mechanism based on a simplified air gap structure, and the equivalent permeance function of the ideal composite rotor is approximated to preserve the average component and the first harmonic component, i.e., the equivalent permeance function of the ideal composite rotor
According to the magnetic field modulation mechanism, the more the number of short-circuit loops is, the closer the equivalent air gap magnetic conductance function of the composite rotor is to the sine, and the better the modulation effect is.
8. The composite rotor modulated double stator brushless doubly fed machine according to claim 1, characterized in that two operation modes of normal operation of the machine, namely "difference modulation" and "sum modulation", are derived according to the magnetic field modulation mechanism:
equivalent pole pair number p of motor rotor in two operation modesrWith steady-state speed omega of motorrAll need to satisfy the formulas respectively; equivalent pole pair number p of rotor in different modesrThat is, the number of the rotor short-circuit coil modulator nests needs to satisfy the first half of the formula to generate the harmonic wave of the correct space angular frequency, and the rotor rotation speed omegarThe latter half part of the formula needs to be satisfied to generate harmonic flux density with the same rotating speed as the magnetomotive force of the coupling winding, so as to induce induced electromotive force with the same frequency; the electric operation needs to meet the condition to adjust and control the frequency of the winding exciting current to regulate and regulate the speed, and the power generation operation is to adjust and control the frequency of the winding exciting current according to the condition under different rotating speeds to realize variable-speed constant-frequency operation.
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| CN (1) | CN112737257A (en) |
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| CN104113174A (en) * | 2014-07-24 | 2014-10-22 | 东南大学 | Single-layer squirrel cage double-stator brushless double-fed motor |
| CN106160379A (en) * | 2015-03-26 | 2016-11-23 | 香港理工大学 | Flux modulation bimorph transducer double electricity port motor |
| CN111245172A (en) * | 2020-03-09 | 2020-06-05 | 东南大学 | Topological optimization method of double-cage rotor of brushless double-fed motor |
| CN111404342A (en) * | 2020-03-10 | 2020-07-10 | 东南大学 | Combined rotor modulator magnetic gear composite motor |
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- 2021-01-22 CN CN202110086222.XA patent/CN112737257A/en active Pending
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|---|---|---|---|---|
| CN104113174A (en) * | 2014-07-24 | 2014-10-22 | 东南大学 | Single-layer squirrel cage double-stator brushless double-fed motor |
| CN106160379A (en) * | 2015-03-26 | 2016-11-23 | 香港理工大学 | Flux modulation bimorph transducer double electricity port motor |
| CN111245172A (en) * | 2020-03-09 | 2020-06-05 | 东南大学 | Topological optimization method of double-cage rotor of brushless double-fed motor |
| CN111404342A (en) * | 2020-03-10 | 2020-07-10 | 东南大学 | Combined rotor modulator magnetic gear composite motor |
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| 程明: "无刷双馈风力发电机的设计、分析与控制", 《电工技术学报》 * |
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Application publication date: 20210430 |