CN110808649B - Double-working harmonic rotor and alternating-current excitation brushless motor - Google Patents
Double-working harmonic rotor and alternating-current excitation brushless motor Download PDFInfo
- Publication number
- CN110808649B CN110808649B CN201911085765.9A CN201911085765A CN110808649B CN 110808649 B CN110808649 B CN 110808649B CN 201911085765 A CN201911085765 A CN 201911085765A CN 110808649 B CN110808649 B CN 110808649B
- Authority
- CN
- China
- Prior art keywords
- rotor
- built
- excitation
- pole
- tangential magnetic
- 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.)
- Active
Links
- 230000005284 excitation Effects 0.000 title claims abstract description 87
- 238000004804 winding Methods 0.000 claims abstract description 110
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000004907 flux Effects 0.000 claims abstract description 19
- 230000003313 weakening effect Effects 0.000 claims description 7
- 230000005415 magnetization Effects 0.000 claims description 4
- 230000005347 demagnetization Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a double-working harmonic rotor and an alternating-current excitation brushless motor, which comprise a stator and a double-working harmonic rotor, wherein the double-working harmonic rotor has p-th high-order harmonic and i-th low-order harmonic, and p is larger than i; the stator slot is internally provided with a main winding and an excitation winding which are both alternating current, and the number of pole pairs of the main winding is equal to the number of high-order harmonic waves; the pole pair number of the excitation winding is equal to the low-order harmonic frequency; p > i. When p =2i, the number of the built-in permanent magnets is 2i, and the number of the tangential magnetic steels is i; when p =3i, the number of the built-in permanent magnets is 2i, and the number of the tangential magnetic steels is 2 i; when p =5i, the number of the built-in permanent magnets is 4i, and the number of the tangential magnetic steels is 2 i; and a magnetic conducting bridge is arranged at the top, the middle part or the bottom of each tangential magnetic steel. The invention can provide rotary excitation magnetic flux by arranging the excitation winding in the stator and controlling the alternating current excitation component of the current of the excitation winding, and the excitation magnetic flux is closed by the magnetic conduction bridge and the iron core pole, thereby adjusting the content of high-order harmonic waves and low-order harmonic waves.
Description
Technical Field
The invention relates to the field of motor design and manufacture, in particular to a double-working harmonic rotor and an alternating-current excitation brushless motor.
Background
Permanent magnet motors have the advantages of high torque/power density, high efficiency, high power factor, etc., and have found use in many applications. However, field weakening of permanent magnet motors is achieved by controlling the direct-axis current component in the armature windingi d ) To achieve this, permanent magnets have the risk of irreversible demagnetization and have limited flux weakening capability.
Due to the existence of the rotor direct-current excitation winding, the air gap magnetic field of the electrically excited synchronous motor is easy to adjust. However, the rotor is a rotating body, and brushless dc excitation of the rotor is complicated. Therefore, an electrically excited synchronous motor requires an additional exciter to achieve brushless excitation, increasing motor complexity and having low power density.
Therefore, the hybrid excitation motor with high power density and high efficiency is produced while flexibly adjusting the air gap magnetic field. The existing hybrid excitation motor almost adopts direct current excitation, and inherits the defect of complex brushless of an electrically excited synchronous reluctance motor. Moreover, the existing hybrid excitation motors are based on a single working harmonic, and an additional auxiliary device is needed to enable excitation magnetic flux to form a closed loop through a low-reluctance iron core (to obtain good magnetic regulation performance).
Disclosure of Invention
The present invention provides a dual-operation harmonic rotor and an ac-excited brushless motor, which have two main operating harmonics, so as to solve the technical problem of the above-mentioned prior art. Meanwhile, the stator is provided with two sets of alternating current windings, one set of alternating current windings is used as a main winding (power winding), and the number of pole pairs of the alternating current windings is equal to the number of high-order harmonic waves in working harmonic waves of the rotor; the other set of windings can be excitation windings, and the number of pole pairs of the excitation windings is equal to the number of low-order harmonic times in the working harmonic waves of the rotor. The contents of two working harmonics in the rotor are adjusted, so that the magnetic field enhancement and the magnetic field weakening are realized. In addition, by controlling the direct-axis exciting current in the exciting winding, the induced electromotive force of the main winding (working winding) is effectively adjusted.
In order to solve the technical problems, the invention adopts the technical scheme that:
a double-working harmonic rotor comprises a built-in permanent magnet pole, tangential magnetic steel, a magnetic conduction bridge and an iron core pole;
the pole pair number of the double working harmonic rotor is p, p-th high-order harmonic and i-th low-order harmonic are provided, and p is larger than i.
When p =2i, the number of the built-in permanent magnet poles is 2i, and the number of the tangential magnetic steels is i, wherein i is a positive integer greater than 1. The i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of the two adjacent tangential magnetic steels are the same along the circumferential direction. A pair of adjacent built-in permanent magnet poles with opposite polarities are built in a rotor iron core between two adjacent tangential magnetic steels. An iron core pole is formed between one built-in permanent magnet pole and one adjacent tangential magnetic steel. And magnetic conducting bridges are arranged at the top, the middle part or the bottom of the i tangential magnetic steels.
When p =3i, the number of the built-in permanent magnet poles is 2i, and the number of the tangential magnetic steels is 2i, wherein i is a positive integer. The 2i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of the two adjacent tangential magnetic steels are opposite along the circumferential direction. A built-in permanent magnet pole is arranged in the rotor iron core between two adjacent tangential magnetic steels. An iron core pole is formed between one built-in permanent magnet pole and the adjacent tangential magnetic steel. The magnetizing directions of two adjacent built-in permanent magnet poles are opposite. And magnetic conduction bridges are arranged at the top, the middle part or the bottom of the 2i tangential magnetic steels.
When p =5i, the number of the built-in permanent magnet poles is 4i, and the number of the tangential magnetic steels is 2i, wherein i is a positive integer. The 2i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of the two adjacent tangential magnetic steels are opposite along the circumferential direction. Two built-in permanent magnet poles with the same polarity are arranged in the rotor iron core between two adjacent tangential magnetic steels, an iron core pole is formed between the two built-in permanent magnet poles with the same polarity, and an iron core pole is formed between each tangential magnetic steel and the adjacent built-in permanent magnet pole. And magnetic conduction bridges are arranged at the top, the middle part or the bottom of the 2i tangential magnetic steels.
The excitation winding is arranged in the stator, the alternating current excitation component of the current of the excitation winding is controlled to provide excitation magnetic flux, and the excitation magnetic flux is closed through the magnetic conduction bridge and the iron core pole, so that the content of high-order harmonic waves and low-order harmonic waves can be adjusted.
Each built-in permanent magnet pole is in a straight shape, a V shape, a W shape, a U shape or a multilayer mixed type.
The double-working harmonic rotor is an inner rotor or an outer rotor, and the magnetic conduction bridge is arranged at the bottom of each tangential magnetic steel deviating from the air gap.
An AC excitation brushless motor comprises a stator and a double-working harmonic rotor. An air gap is arranged between the stator and the double-working harmonic rotor.
A main winding and an excitation winding are wound in a stator slot of the stator, and the number p of pole pairs of the main winding is equal to the number of high-order harmonic waves in the working harmonic waves of the rotor. The pole pair number i of the excitation winding is equal to the lower harmonic number in the working harmonic of the rotor. p and i are both positive integers, and p > i.
Because the pole pair number of the excitation winding is equal to the number of times of the low-order harmonic wave, when negative direct-axis current is injected into the excitation winding, the content of the low-order harmonic wave can be reduced, and meanwhile, the content of the high-order harmonic wave can be improved, so that the magnetization increasing is realized. On the contrary, when the positive direct-axis current is injected into the excitation winding, the low-order harmonic content can be improved, and the high-order harmonic content can be reduced, so that the field weakening is realized. Therefore, the induced electromotive force of the main winding is effectively adjusted by controlling the direct-axis excitation current in the excitation winding.
When the field winding is required to provide torque, the output torque is generated by controlling the torque component of the field winding current to interact with the low order harmonics.
The main winding and the excitation winding are both alternating current windings.
The invention has the following beneficial effects:
1. the rotor can generate two major operating harmonics. Meanwhile, the stator of the invention has two sets of alternating current windings. One set of the windings is used as a main winding (power winding), and the pole pair number of the main winding is equal to the higher harmonic frequency in the working harmonic of the rotor. The other set of windings can be excitation windings, and the number of pole pairs of the excitation windings is equal to the number of low-order harmonic times in the working harmonic waves of the rotor.
2. When the magnetic field needs to be adjusted, the excitation component (direct axis current) of the excitation winding current is controlled to provide excitation magnetic flux, so that the content of two working harmonics of the rotor can be adjusted. Specifically, because the pole pair number of the excitation winding corresponds to the working harmonic of the low-order rotor, if negative direct-axis current is injected into the excitation winding, the harmonic content of the low-order rotor is weakened, and meanwhile, the working harmonic content of the high-order rotor is improved, so that the magnetization increasing is realized. On the contrary, if the positive direct-axis current is injected into the excitation winding, the harmonic content of the low-order rotor can be improved, and meanwhile, the working harmonic content of the high-order rotor can be reduced, so that the field weakening is realized. Therefore, the induced electromotive force of the main winding (working winding) can be effectively adjusted by controlling the direct-axis field current in the field winding.
3. The field winding may also be used for the power winding. When the excitation winding is required to provide torque, the torque is generated by controlling the interaction of the torque component (quadrature axis current) of the excitation winding current and the rotor low-order working harmonic.
4. The double-working harmonic rotor is of a mixed pole structure, and a magnetic conduction bridge is arranged at the top or the bottom or the middle of the tangential magnetic steel. The magnetic conduction bridge and the iron core pole (the pole formed between the built-in permanent magnet and the tangential magnetic steel) provide a low-reluctance path for the magnetic flux generated by the stator excitation winding, thereby being convenient for realizing magnetic flux regulation and reducing the risk of demagnetization of the permanent magnet caused by electric excitation.
Drawings
Fig. 1 shows a schematic structural diagram of an ac-excited brushless motor of the present invention at p =3i and i = 1.
Fig. 2 shows a graph of the air gap flux density of an ac excited brushless motor (p =3i, i = 1) of the present invention in different excitation modes.
Fig. 3 shows the magnetic flux distribution profile of an ac-excited brushless motor (p =3i, i = 1) of the present invention when electrically excited alone.
Fig. 4 shows a schematic structure of a dual-operation harmonic rotor of the present invention at p =2i, and i = 2.
Fig. 5 shows a schematic structure of a dual-operation harmonic rotor of the present invention at p =5i, and i = 1.
Among them are:
10. a stator; 11. a main winding; 12. an excitation winding;
20. a dual-working harmonic rotor; 21. a permanent magnet pole is arranged inside; 22. tangential magnetic steel; 23. a magnetic conducting bridge; 24. a core pole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1, an ac excitation brushless motor includes a stator 10 and a dual-working harmonic rotor 20; an air gap is arranged between the stator and the double-working harmonic rotor.
The stator and the rotor core of the double-working harmonic rotor are both preferably made of magnetic conductive materials.
The pole pair number of the double working harmonic rotor is p, and two working harmonics can be generated, namely p-th high-order harmonic and i-th low-order harmonic.
A main winding 11 and an excitation winding 12 are wound in a stator slot of the stator, and the number p of pole pairs of the main winding is equal to the number of high-order harmonic times in the working harmonic of the rotor. The pole pair number i of the excitation winding is equal to the lower harmonic number in the working harmonic of the rotor. p and i are both positive integers, and p > i.
The main winding and the excitation winding are both preferably alternating current windings, and the number of phases of the excitation winding is preferably equal to that of the main winding, and may be different.
An AC excited brushless motor can be used as a motor or a generator.
As shown in fig. 1, 4 and 5, the double-working harmonic rotor comprises a built-in permanent magnet pole 21, tangential magnetic steel 22, a magnetic conductive bridge 23 and an iron core pole 24.
A dual-operation harmonic rotor has the following preferred embodiments.
Example 1 with three-phase inner rotor m =3,N s =36，pexample of =3i (i = 1)
In the ac excitation brushless motor of embodiment 1, the number of stator slots is set to m =3 for the three-phase main windingN s =36, number of pole pairs of main windingpFor example, fig. 1 shows an inner rotor motor in which the number of pole pairs of the field winding i =1 is = 3.
The main winding and the excitation winding are both alternating current windings, and the number of phases of the excitation winding is preferably equal to that of the main winding, and may be different.
The main winding of the embodiment is A, B, C phases, wherein the A phase can be formed by connecting A1-A6 coils in series, or can be formed by connecting A1-A2, A3-A4 and A5-A6 in series respectively and then in parallel. And the phases B and C are analogized in the same way. The excitation winding is X, Y, Z phases, only X phase is shown in the figure, X, Y, Z phases are different by 120 degrees in a counterclockwise sequence. Specifically, the required magnetic regulation and output capacity can be obtained by flexibly adjusting the slot area proportion of the two sets of windings according to different application occasions and requirements.
When p =3i, the number of the built-in permanent magnet poles is 2i, and the number of the tangential magnetic steels is 2i, wherein i is a positive integer. In this embodiment, i =1, that is, the number of the built-in permanent magnet poles and the tangential magnetic steels is 2, as shown in fig. 1.
The 2i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of the two adjacent tangential magnetic steels are opposite along the circumferential direction. A built-in permanent magnet pole is arranged in the rotor iron core between two adjacent tangential magnetic steels. An iron core pole is formed between one built-in permanent magnet pole and the adjacent tangential magnetic steel. The magnetizing directions of two adjacent built-in permanent magnet poles are opposite. And magnetic conduction bridges are arranged at the top, the middle part or the bottom of the 2i tangential magnetic steels.
The tangential magnetic steel and the built-in permanent magnet poles are embedded in the rotor iron core, so that high-speed operation is facilitated. Built-in permanent magnet pole is in this
In the examples, the shape is preferably V-shaped, but may be a straight shape, V-shaped, W-shaped, U-shaped, or a multilayer hybrid type.
As shown in FIG. 2, the dual-operation harmonic rotor of the present invention is capable of generating p (i.e., 3) higher harmonics and i (also i) harmonics
I.e., order 1) lower order harmonic harmonics. The pole pair number p of the main winding is equal to the higher harmonic order. The pole pair number i of the excitation winding is equal to the number of the low-order harmonics.
The rotor double-working harmonic wave in the invention means that the rotor can generate two air gap flux density harmonic waves with different orders (the air gap is the medium of energy conversion); the pole pairs of the main winding and the excitation winding correspond to the pole pairs respectively.
The bottom of the tangential magnetic steel is preferably provided with a magnetic conduction bridge, and the magnetic conduction bridge and an iron core pole (a pole formed between the built-in permanent magnet and the tangential magnetic steel) provide a low-reluctance path for magnetic flux generated by the excitation winding, so that the magnetic flux can be adjusted conveniently, and the risk of demagnetization of the permanent magnet caused by electric excitation can be reduced.
As shown in fig. 3, the magnetic flux generated by the stator electro-magnetic field winding is closed through the magnetic bridges and the core poles. In fig. 3, it is assumed that all the magnetic steels do not exist, specifically: when in mixed excitation, the permanent magnetic field and the electric excitation magnetic field exist simultaneously. To make sense of studying the flux path of the electrical excitation field, the permanent magnet will be assumed to be air.
When the magnetic field needs to be adjusted, the excitation component (direct axis current) of the excitation winding current is controlled to provide excitation magnetic flux, so that the content of two working harmonics of the rotor can be adjusted. Specifically, as shown in fig. 2, since the number of pole pairs of the excitation winding corresponds to the low-order rotor operating harmonic, if negative direct-axis current is injected into the excitation winding, the harmonic content of the low-order rotor is weakened, and at the same time, the working harmonic content of the high-order rotor is increased, thereby realizing magnetization enhancement. On the contrary, if the positive direct-axis current is injected into the excitation winding, the harmonic content of the low-order rotor can be improved, and meanwhile, the working harmonic content of the high-order rotor can be reduced, so that the field weakening is realized. Therefore, the induced electromotive force of the main winding (working winding) can be effectively adjusted by controlling the direct-axis field current in the field winding.
The field winding may also be used for the power winding. When the excitation winding is required to provide torque, the output torque is generated by controlling the interaction of the torque component (quadrature axis current) of the excitation winding current and the rotor low-order working harmonic.
When the tangential magnetic steel is in a magnetizing mode, redundant magnetic potential is provided, and high-order harmonic waves of the rotor and the increase of output capacity are facilitated.
The double working harmonic rotor can be an inner rotor or an outer rotor.
Example 2
When p =2i, the number of the built-in permanent magnet poles is 2i, and the number of the tangential magnetic steels is i, wherein i is a positive integer greater than 1. The i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of the two adjacent tangential magnetic steels are the same along the circumferential direction. A pair of adjacent built-in permanent magnet poles with opposite polarities are built in a rotor iron core between two adjacent tangential magnetic steels. An iron core pole is formed between one built-in permanent magnet pole and one adjacent tangential magnetic steel. And magnetic conducting bridges are arranged at the top, the middle part or the bottom of the i tangential magnetic steels.
In this embodiment, assuming that i =2, the number of built-in permanent magnet poles is 4, and the number of tangential magnetic steels is 2, as shown in fig. 4. In the present application, i cannot be 1, and when i =1, the entire circumference includes two built-in permanent magnet poles, a tangential magnetic field, and two core poles. At this time, the structure is asymmetric, which is not favorable for the stable operation of the motor.
Example 3
When p =5i, the number of the built-in permanent magnet poles is 4i, and the number of the tangential magnetic steels is 2i, wherein i is a positive integer. The 2i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of the two adjacent tangential magnetic steels are opposite along the circumferential direction. Two built-in permanent magnet poles with the same polarity are arranged in the rotor iron core between two adjacent tangential magnetic steels, an iron core pole is formed between the two built-in permanent magnet poles with the same polarity, and an iron core pole is formed between each tangential magnetic steel and the adjacent built-in permanent magnet pole. And magnetic conduction bridges are arranged at the top, the middle part or the bottom of the 2i tangential magnetic steels.
In this embodiment, if i =1, the number of the built-in permanent magnet poles is 4, and the number of the tangential magnetic steels is 2, as shown in fig. 5.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (7)
1. A dual-operation harmonic rotor, comprising: the magnetic field generator comprises a built-in permanent magnet pole, tangential magnetic steel, a magnetic conduction bridge and an iron core pole;
the pole pair number of the double-working harmonic rotor is p, p high-order harmonic waves and i low-order harmonic waves are provided, and p is larger than i;
when p =2i, the number of the built-in permanent magnet poles is 2i, and the number of the tangential magnetic steels is i, wherein i is a positive integer greater than 1; the i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of two adjacent tangential magnetic steels are the same along the circumferential direction; a pair of adjacent built-in permanent magnet poles with opposite polarities are built in a rotor iron core between two adjacent tangential magnetic steels; an iron core pole is formed between one built-in permanent magnet pole and one adjacent tangential magnetic steel; the top, the middle part or the bottom of the i tangential magnetic steels are provided with magnetic conduction bridges;
when p =3i, the number of the built-in permanent magnet poles is 2i, and the number of the tangential magnetic steels is 2i, wherein i is a positive integer; 2i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of two adjacent tangential magnetic steels are opposite along the circumferential direction; a built-in permanent magnet pole is arranged in the rotor core between two adjacent tangential magnetic steels; an iron core pole is formed between one built-in permanent magnet pole and the adjacent tangential magnetic steel; the magnetizing directions of two adjacent built-in permanent magnet poles are opposite; the top, the middle part or the bottom of the 2i tangential magnetic steels are provided with magnetic conduction bridges;
when p =5i, the number of the built-in permanent magnet poles is 4i, and the number of the tangential magnetic steels is 2i, wherein i is a positive integer; 2i tangential magnetic steels are uniformly distributed along the circumferential direction of the rotor core, and the magnetizing directions of two adjacent tangential magnetic steels are opposite along the circumferential direction; two built-in permanent magnet poles with the same polarity are built in a rotor iron core between two adjacent tangential magnetic steels, and an iron core pole is formed between the two built-in permanent magnet poles with the same polarity; an iron core pole is respectively formed between the tangential magnetic steel and the adjacent built-in permanent magnet pole; the top, the middle part or the bottom of the 2i tangential magnetic steels are provided with magnetic conduction bridges;
the excitation winding is arranged in the stator, the alternating current excitation component of the current of the excitation winding is controlled to provide excitation magnetic flux, and the excitation magnetic flux is closed through the magnetic conduction bridge and the iron core pole, so that the content of high-order harmonic waves and low-order harmonic waves can be adjusted.
2. The dual-operation harmonic rotor of claim 1, wherein: each built-in permanent magnet pole is in a straight shape, a V shape, a W shape, a U shape or a multilayer mixed type.
3. The dual-operation harmonic rotor of claim 1, wherein: the double-working harmonic rotor is an inner rotor or an outer rotor, and the magnetic conduction bridge is arranged at the bottom of each tangential magnetic steel deviating from the air gap.
4. Alternating current excitation brushless motor, its characterized in that: a dual-operation harmonic rotor comprising a stator and any one of claims 1-3; an air gap is arranged between the stator and the double-working harmonic rotor;
a main winding and an excitation winding are wound in a stator slot of the stator, and the number p of pole pairs of the main winding is equal to the number of high-order harmonic waves in the working harmonic waves of the rotor; the pole pair number i of the excitation winding is equal to the low-order harmonic frequency in the working harmonic of the rotor; p and i are both positive integers, and p > i.
5. An ac excited brushless motor as claimed in claim 4, wherein: because the pole pair number of the excitation winding is equal to the number of the low-order harmonics, when negative direct-axis current is injected into the excitation winding, the content of the low-order harmonics is reduced, and the content of the high-order harmonics is increased, so that the magnetization increase is realized; on the contrary, when positive direct-axis current is injected into the excitation winding, the low-order harmonic content can be improved, and the high-order harmonic content can be reduced, so that the field weakening is realized; therefore, the induced electromotive force of the main winding is effectively adjusted by controlling the direct-axis excitation current in the excitation winding.
6. An ac excited brushless motor as claimed in claim 5, wherein: when the field winding is required to provide torque, the output torque is generated by controlling the torque component of the field winding current to interact with the low order harmonics.
7. An ac excited brushless motor as claimed in claim 4, wherein: the main winding and the excitation winding are both alternating current windings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911085765.9A CN110808649B (en) | 2019-11-08 | 2019-11-08 | Double-working harmonic rotor and alternating-current excitation brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911085765.9A CN110808649B (en) | 2019-11-08 | 2019-11-08 | Double-working harmonic rotor and alternating-current excitation brushless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110808649A CN110808649A (en) | 2020-02-18 |
| CN110808649B true CN110808649B (en) | 2021-01-12 |
Family
ID=69501579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911085765.9A Active CN110808649B (en) | 2019-11-08 | 2019-11-08 | Double-working harmonic rotor and alternating-current excitation brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110808649B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803628A (en) * | 2021-02-01 | 2021-05-14 | 南京航空航天大学 | Split-tooth type alternate-pole hybrid excitation brushless motor based on alternating-current excitation |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6989619B2 (en) * | 2003-05-22 | 2006-01-24 | Ut-Battelle Llc | Rotor apparatus for high strength undiffused brushless electric machine |
| CN101478207B (en) * | 2009-01-19 | 2011-07-20 | 南昌大学 | Dual feedback mixed magnetic pole permanent magnetic motor |
| JP5990890B2 (en) * | 2011-10-04 | 2016-09-14 | 日本精工株式会社 | Electric motor control device and electric power steering device |
| CN103199662B (en) * | 2013-03-11 | 2016-05-11 | 南昌大学 | The composite excitation permanent magnet synchronous motor of third harmonic excitation |
| CN103259382B (en) * | 2013-06-03 | 2016-04-06 | 东南大学 | One opens winding mixed excitation electric machine |
| CN106026583B (en) * | 2016-05-30 | 2019-01-22 | 东南大学 | One kind being based on magnetic field modulation bimorph transducer composite excitation motor |
| CN109951038B (en) * | 2019-03-05 | 2020-07-24 | 南京航空航天大学 | Bilateral excitation type tangential magnetic steel mixed excitation brushless motor |
-
2019
- 2019-11-08 CN CN201911085765.9A patent/CN110808649B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110808649A (en) | 2020-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gao et al. | A novel hybrid excitation flux reversal machine for electric vehicle propulsion | |
| Wang et al. | Principle of flux-switching permanent magnet machine by magnetic field modulation theory part I: Back-electromotive-force generation | |
| CN108964396B (en) | Stator partition type alternate pole hybrid excitation motor | |
| CN109951038B (en) | Bilateral excitation type tangential magnetic steel mixed excitation brushless motor | |
| WO2022161375A1 (en) | Rotor magnetic pole modulation-type induction hybrid excitation brushless motor and power generation system | |
| Zhang et al. | Quantitative evaluation of the topologies and electromagnetic performances of dual-three-phase flux-switching machines | |
| Zhao et al. | Comparative study of wound-field flux-switching machines and switched reluctance machines | |
| CN111082548A (en) | Stator modular hybrid excitation alternating pole magnetic flux reverse motor | |
| Chen et al. | Optimal combination of stator and rotor pole numbers in flux-switching PM brushless AC machines | |
| CN109038990A (en) | High torque density error-tolerance type mixing magnetic flow permanent magnet motor | |
| CN110739891B (en) | Electric excitation synchronous reluctance brushless power generation system | |
| CN113489178B (en) | Wide-area-running alternating pole type permanent magnet auxiliary synchronous reluctance motor | |
| Zhang et al. | Rediscovery of permanent magnet flux-switching machines applied in EV/HEVs: Summary of new topologies and control strategies | |
| Wei et al. | New dual-PM spoke-type flux-reversal machines for direct-drive applications | |
| CN110808649B (en) | Double-working harmonic rotor and alternating-current excitation brushless motor | |
| CN112803628A (en) | Split-tooth type alternate-pole hybrid excitation brushless motor based on alternating-current excitation | |
| Mbadiwe et al. | Torque performance analysis of three-phase permanent magnet flux switching motor in out-runner segmented rotor for in-wheel propulsion | |
| CN110808648B (en) | Mixed magnetic steel AC excitation memory motor | |
| CN112787476B (en) | Integrated direct-current induction hybrid excitation brushless motor based on alternating-pole rotor | |
| CN112910131B (en) | Rotor magnetic pole modulation type bypass type mixed excitation motor | |
| CN101976923B (en) | Hybrid excitation permanent magnet motor with secondary harmonic excitation | |
| CN115347753A (en) | Double-stator motor based on excitation source synchronous and asynchronous double modulation | |
| Shen et al. | Design and analysis of a novel modular six-phase linear permanent-magnet vernier machine | |
| CN113541430A (en) | Split pole type permanent magnet auxiliary synchronous reluctance motor | |
| Dobzhanskyi | Comparison analysis of cylindrical and rectangular linear permanent magnet transverse-flux machines for wave energy applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |