CN109617349B - Single-winding double-mechanical-port permanent magnet motor - Google Patents
Single-winding double-mechanical-port permanent magnet motor Download PDFInfo
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- CN109617349B CN109617349B CN201811435734.7A CN201811435734A CN109617349B CN 109617349 B CN109617349 B CN 109617349B CN 201811435734 A CN201811435734 A CN 201811435734A CN 109617349 B CN109617349 B CN 109617349B
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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
- H02K16/02—Machines with one stator and two or more rotors
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- 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
- H02K1/165—Shape, form or location of the slots
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a single-winding double-mechanical-port permanent magnet motor which comprises a stator core, a stator winding, an outer rotor and an inner rotor, wherein the stator core is arranged on the stator winding; a set of stator windings capable of generating two magnetic fields with different pole pairs (non-tooth harmonic waves) is arranged in a motor stator, and the equivalent permanent magnet windings are equal to the pole pairs of the outer rotor, so that the stator and the permanent magnet outer rotor form an equivalent permanent magnet motor structure; meanwhile, the number of pole pairs of the equivalent modulation winding is equal to the sum or difference absolute value of the number of pole pairs of the outer rotor and the number of pole pairs of the inner rotor, so that the stator, the outer rotor and the inner rotor jointly form a magnetic field modulation motor structure. The single-winding double-mechanical-port permanent magnet motor provided by the invention can realize decoupling control of the torque and the rotating speed of the inner rotor and the outer rotor only by using one set of winding, so that the structure of the motor is greatly simplified, and in addition, the available space of the stator winding is increased, and the selectable electric load of the motor is increased, so that the output torque of the motor is increased.
Description
Technical Field
The invention belongs to the technical field of permanent magnet motors, and particularly relates to a single-winding double-mechanical-port permanent magnet motor.
Background
In recent years, new energy automobiles develop rapidly, wherein hybrid electric vehicles have longer driving distance and more reasonable manufacturing cost than pure electric vehicles and fuel cell vehicles, and become more ideal new energy automobiles. The series-parallel power system has the advantages that the engine in the series system always stably runs in the optimal working area and the generator with smaller displacement can be selected, and also has the characteristic that the engine and the motor in the parallel system are jointly driven or respectively and independently drive the motor, so that the degree of freedom is higher, the whole set of power system can run in the optimal state under the more complex working condition, and the exhaust emission and the oil consumption can easily meet the target requirements.
However, the series-parallel power system has a complex structure, high cost and heavy vehicle body weight. In order to compensate for these defects and make the system more compact, a brushless dual-mechanical-port permanent magnet motor is proposed by scholars, and patent document CN106374704A discloses a brushless dual-mechanical-port permanent magnet motor based on a magnetic field modulation principle, which comprises a stator with two sets of armature windings, a modulation rotor and a permanent magnet rotor, and the decoupling of the torque and the rotating speed of the two mechanical ports (the modulation rotor and the permanent magnet rotor) is realized by the two sets of armature windings by using the magnetic field modulation principle.
However, the brushless dual mechanical port permanent magnet motor based on the magnetic field modulation principle disclosed in patent document CN106374704A also has the following disadvantages: in the motor structure proposed in the patent document, two sets of windings with different pole pairs are arranged in the same stator slot, and insulation needs to be laid between the windings, so that the processing technology is complex; in addition, insulation laid between the windings occupies part of the space in the slot, so that the available space of the stator armature winding is reduced, and therefore, under the condition of the same copper consumption, the available electric load is reduced, and the output torque of the motor is weakened.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a single-winding double-mechanical-port permanent magnet motor, which aims to solve the technical problems that the existing brushless double-mechanical-port permanent magnet motor based on the magnetic field modulation principle is difficult to machine and the output torque of the motor is reduced because insulation needs to be laid between windings when two sets of windings are placed in the same stator slot.
In order to achieve the purpose, the invention provides a single-winding double-mechanical-port permanent magnet motor which comprises a stator core, a stator winding, an outer rotor and an inner rotor;
the stator winding can generate magnetic fields with two different pole pairs (non-tooth harmonic waves), one is an equivalent permanent magnet winding, and the pole pair number is Pa1(ii) a The other is an equivalent modulation winding with the number of pole pairs being Pa。
The stator comprises a stator core and is characterized in that a plurality of closed slots which are uniformly distributed are formed in the surface of the stator core, a set of stator winding is placed in each closed slot, an outer rotor is arranged between the stator winding and an inner rotor, and the stator, the outer rotor and the inner rotor are coaxially sleeved.
The outer rotor is a permanent magnet rotor and is formed by alternately exciting permanent magnets and ferromagnetic blocks in a tangential direction;
the inner rotor is a reluctance rotor or a permanent magnet rotor, the permanent magnet rotor is provided with a yoke part, and the permanent magnet can be arranged on the surface or inside the inner rotor.
Equivalent permanent magnet winding pole pair number Pa1The number of pole pairs of the motor stator is equal to that of the outer rotor, so that the motor stator and the outer rotor form an equivalent permanent magnet motor structure;
equivalent modulation winding pole pair number PaThe number is equal to the sum or difference absolute value of the number of pole pairs of the outer rotor and the number of pole pairs of the inner rotor, so that the motor stator, the outer rotor and the inner rotor jointly form an equivalent magnetic field modulation motor structure.
Optionally, the outer rotor is a modulation ring rotor and is made of modulation blocks fixed by non-magnetic materials, the inner rotor is a permanent magnet rotor, and at the moment, the equivalent permanent magnet motor structure is formed by combining a motor stator and the inner rotor.
Alternatively, the stator armature winding is not limited to a three-phase winding, and may be a four-phase, five-phase, six-phase, eight-phase, nine-phase, ten-phase, twelve-phase, fifteen-phase, sixteen-phase, eighteen-phase, twenty-four-phase, or other multi-phase winding.
Alternatively, the stator may be placed outside or inside the two rotors to form an outer stator or inner stator structure.
The single-winding double-mechanical-port permanent magnet motor is applied to various technical fields of hybrid power systems, wind power generation and the like.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the motor structure can realize decoupling control of torque and rotating speed of the inner rotor and the outer rotor only by using one set of winding on the premise of ensuring that an armature magnetic field with two pole pairs (non-tooth harmonic waves) can be generated, and insulation between the windings does not need to be laid, so that the motor structure is greatly simplified, and the processing is convenient.
(2) The motor saves a set of winding and does not need to lay insulation, so that the available space of the stator winding is increased, and the selectable electric load of the motor is larger under the condition of the same copper consumption, thereby increasing the output torque of the motor.
Drawings
Fig. 1 is a single-winding double-mechanical-port motor according to an embodiment of the present invention, in which an outer rotor is a permanent magnet rotor of spoke magnetic steel, and an inner rotor is a reluctance rotor;
fig. 2 is a single-winding double-mechanical-port motor according to an embodiment of the present invention, in which an outer rotor is a permanent magnet rotor of spoke magnetic steel, and an inner rotor is a permanent magnet rotor;
fig. 3 is a schematic diagram of a single-winding dual-mechanical-port motor according to an embodiment of the present invention, where the outer rotor is a modulation ring rotor and the inner rotor is a permanent magnet rotor;
the same reference numbers will be used throughout the drawings to refer to the same elements or structures, wherein: 1 is a stator core, 2 is a stator winding, 3 is an outer rotor, and 4 is an inner rotor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to a first embodiment of the present invention, as shown in fig. 1, the dual mechanical port permanent magnet machine comprises: a stator core 1, a stator winding 2, an outer rotor 3 and an inner rotor 4;
24 closed slots are uniformly distributed on the surface of a stator core 1, a set of stator windings 2 which can generate two different pole pair magnetic fields without forming tooth harmonic waves are placed in the slots, the stator core 1 and the stator windings 2 jointly form a motor stator, and an outer rotor 3 is placed between the motor stator and an inner rotor 4;
the outer rotor 3 is a permanent magnet rotor, and the magnetic steel is arranged in a spoke structure, namely, the magnetic steel is formed by alternately exciting permanent magnets and ferromagnetic blocks in a tangential direction, and the polarization directions of adjacent permanent magnets are opposite; the inner rotor 4 is a reluctance rotor.
The stator winding 2 is a winding which can generate two magnetic fields with different pole pair numbers of non-tooth harmonic waves, wherein one of the magnetic fields is an equivalent permanent magnet winding, and the pole pair number is Pa1(ii) a The other is an equivalent modulation winding with the number of pole pairs being Pa. The number of 3 pole pairs of the outer rotor is ProThe number of the inner rotor 4 pole pairs is Pri。
Equivalent permanent magnet winding pole pair number Pa1With the outsideNumber of 3 pole pairs P of rotorroThe motor stator and the outer rotor 3 can form an equivalent permanent magnet motor structure;
equivalent modulation winding pole pair number PaEqual to 3 pole pairs P of outer rotor ro4 pole pairs P with inner rotorriThe sum or the difference of the two magnetic fields is the absolute value of the sum or the difference of the two magnetic fields, so that the motor stator, the outer rotor 3 and the inner rotor 4 jointly form an equivalent magnetic field modulation motor structure.
The working principle of the motor will now be described with reference to fig. 1, but the working principles of other motors with the same structure are the same.
The stator winding 2 is fed with a current i consisting of two sinusoidal currents with different amplitudes, frequencies and phases, and the expression is as follows:
is introduced into1Corresponding current forms an equivalent permanent magnet winding and is introduced into I2The corresponding currents form equivalent modulation windings.
In an equivalent permanent magnet machine configuration, the rotational speed n of the outer rotor 3riCurrent frequency omega in equivalent permanent magnet winding1Controlling; magnitude of torque T generated by outer rotor 3roEquivalent current effective value I on permanent magnet winding1And the current angle Ψ1(ii) related;
in the structure of the equivalent magnetic field modulation motor, the rotating speed of the inner rotor 4 is modulated by the equivalent magnetic field to modulate the current frequency omega in the winding2And equivalent permanent magnet winding current frequency omega1Control of (2); the outer rotor 3 and the inner rotor 4 are subjected to magnetic field modulation to generate torque Tro、TriTwo torque magnitudes and effective value of current I on equivalent modulation winding2And the current angle Ψ2Related to, and respectively the number of their pole pairs Pro、PriIs in direct proportion.
As a transmission device, the rotating speed and the torque of two mechanical ports of the motor, namely the inner rotor 4 and the outer rotor 3, need to be controlled independently.
The equivalent permanent magnet winding current frequency can be respectively calculated according to the rotating speed required by the portRate omega1And equivalent modulation of winding current frequency omega2Then controlling two current frequencies omega led into the stator winding1、ω2The decoupling control of the rotating speed of the inner rotor 4 and the outer rotor 3 can be realized.
The output torque of the inner rotor 4 is only controlled by the equivalent magnetic field modulation winding, and the effective value I of the current passing through the equivalent magnetic field modulation winding can be calculated according to the torque required by the inner rotor 42Angle of sum current Ψ2。
The torque is also generated on the outer rotor 3 due to the magnetic field modulation effect, so the torque provided by the equivalent permanent magnet winding to the outer rotor 3 is the difference between the output torque required by the outer rotor 3 and the torque generated on the outer rotor 3 by the magnetic field modulation motor structure, and the effective value I of the current in the equivalent permanent magnet winding is determined according to the calculated difference1Angle of sum current Ψ1。
In summary, the rotation speed and the torque of the two mechanical ports can be controlled by adjusting the frequency ω, the effective value I and the current angle Ψ of the two sinusoidal currents flowing into the stator winding 2.
According to the second embodiment of the present invention, the outer rotor 3 is formed by the permanent magnets excited tangentially and the ferromagnetic blocks alternately, the inner rotor 4 is a permanent magnet rotor, there is a yoke part, the permanent magnets can be arranged on the surface of the inner rotor 4 (as shown in fig. 2) or inside the inner rotor 4, and at this time, the working principle of the motor is the same as that of the motor with the structure shown in fig. 1.
According to the third embodiment of the present invention, the outer rotor 3 is a modulation ring rotor, which is made of modulation blocks fixed by non-magnetic materials, the inner rotor 4 is a permanent magnet rotor, there is a yoke portion, the permanent magnet can be placed on the surface of the inner rotor 4 (as shown in fig. 3) or inside the inner rotor 4, at this time, the equivalent permanent magnet motor structure is composed of a motor stator and the inner rotor 4.
In the motor structure shown in fig. 1, 2, and 3, the motor stator may be placed outside the inner and outer rotors to form an outer stator structure, or the motor stator may be placed inside the inner and outer rotors to form an inner stator structure, thereby achieving the same effect.
The stator winding 2 is not limited to a three-phase winding, and may be a four-phase, five-phase, six-phase, eight-phase, nine-phase, ten-phase, twelve-phase, fifteen-phase, sixteen-phase, eighteen-phase, twenty-four-phase, or other multi-phase winding.
In the above structure, the motor stator, the outer rotor 3 and the inner rotor 4 are coaxially sleeved.
Compared with the existing double-mechanical-port permanent magnet motor, the motor structure provided by the invention can realize decoupling control of torque and rotating speed of the inner rotor and the outer rotor only by using one set of winding, and insulation among the windings does not need to be laid, so that the motor structure is greatly simplified, and the processing difficulty is reduced; and because a set of winding is omitted, insulation does not need to be laid, and the available space of the stator winding is increased, the selectable electric load of the motor is increased under the condition of the same copper consumption, and the output torque of the motor is increased.
The single-winding double-mechanical-port permanent magnet motor provided by the invention can be applied to various technical fields of hybrid power systems, wind power generation and the like.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A single-winding double-mechanical-port permanent magnet motor is characterized by comprising a stator core, a stator winding, an outer rotor and an inner rotor;
the surface of the stator core is provided with a plurality of closed slots which are uniformly distributed, a set of stator windings are placed in the slots, the stator core and the stator windings jointly form a motor stator, the motor stator is arranged outside the outer rotor and the inner rotor, and the outer rotor is arranged between the motor stator and the inner rotor;
the stator winding is introduced with a first sinusoidal current and a second sinusoidal current with set amplitude, frequency and phase, and two magnetic fields with different pole pairs which do not form tooth harmonic waves can be generated, wherein one magnetic field is an equivalent permanent magnet winding magnetic field, and the other magnetic field is an equivalent modulation winding magnetic field; the outer rotor is a permanent magnet rotor, and the inner rotor is a reluctance rotor;
under the action of a first sinusoidal current, the number of pole pairs of the equivalent permanent magnet winding magnetic field is equal to that of the outer rotor, so that a motor stator and the outer rotor form an equivalent permanent magnet motor structure; meanwhile, under the action of a second sinusoidal current, the number of pole pairs of the equivalent modulation winding magnetic field is equal to the sum or difference absolute value of the number of pole pairs of the outer rotor and the number of pole pairs of the inner rotor, so that the motor stator, the outer rotor and the inner rotor jointly form an equivalent magnetic field modulation motor structure; the amplitude, phase and frequency of the first sinusoidal current and the second sinusoidal current are adjusted according to the rotating speed and the torque of the inner rotor and the outer rotor.
2. The single-winding dual-mechanical-port permanent magnet motor according to claim 1, wherein the outer rotor is formed by tangentially-excited permanent magnets and ferromagnetic blocks in an alternating manner.
3. The single-winding dual-mechanical-port permanent magnet motor according to claim 1, wherein the inner rotor is also a permanent magnet rotor, a yoke part is arranged on the permanent magnet rotor, and the permanent magnet can be arranged on the surface of or in the inner rotor.
4. The single-winding double-mechanical-port permanent magnet motor according to claim 1, wherein the outer rotor can also be a modulation ring rotor, and is made of modulation blocks fixed by a non-magnetic material, and the inner rotor is a permanent magnet rotor, and in this case, the equivalent permanent magnet motor structure is composed of a motor stator and an inner rotor.
5. The single-winding dual-mechanical-port permanent magnet motor according to claim 4, wherein the motor stator can be placed inside the inner rotor and the outer rotor to form an inner stator structure.
6. The single-winding, dual-mechanical-port permanent magnet motor of claim 5, wherein the motor stator, the outer rotor, and the inner rotor are coaxially sleeved.
7. The single-winding, dual-mechanical-port permanent magnet machine of claim 6, wherein said stator windings are three-phase windings, or four-phase, five-phase, six-phase, eight-phase, nine-phase, ten-phase, twelve-phase, fifteen-phase, sixteen-phase, eighteen-phase, twenty-four-phase windings.
8. A single-winding double-mechanical-port permanent magnet motor according to any one of claims 1 to 7, wherein the motor is applied to the fields of hybrid power systems and wind power generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811435734.7A CN109617349B (en) | 2018-11-28 | 2018-11-28 | Single-winding double-mechanical-port permanent magnet motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811435734.7A CN109617349B (en) | 2018-11-28 | 2018-11-28 | Single-winding double-mechanical-port permanent magnet motor |
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| Publication Number | Publication Date |
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| CN109617349A CN109617349A (en) | 2019-04-12 |
| CN109617349B true CN109617349B (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811435734.7A Active CN109617349B (en) | 2018-11-28 | 2018-11-28 | Single-winding double-mechanical-port permanent magnet motor |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0945963B1 (en) * | 1998-03-25 | 2003-11-05 | Nissan Motor Co., Ltd. | Motor/generator |
| CN102324820A (en) * | 2011-08-17 | 2012-01-18 | 浙江大学 | Magnetic field modulated multi-power port permanent magnetic motor |
| CN106374704B (en) * | 2016-09-09 | 2019-05-10 | 华中科技大学 | A kind of brushless dual-mechanical port magneto based on magnetic field modulation principle |
| CN106655671B (en) * | 2016-12-12 | 2019-07-19 | 华中科技大学 | A kind of brushless dual electricity port magneto of high torque density and its application |
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- 2018-11-28 CN CN201811435734.7A patent/CN109617349B/en active Active
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