CN115842425A - High-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor - Google Patents

High-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor Download PDF

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Publication number
CN115842425A
CN115842425A CN202211246182.1A CN202211246182A CN115842425A CN 115842425 A CN115842425 A CN 115842425A CN 202211246182 A CN202211246182 A CN 202211246182A CN 115842425 A CN115842425 A CN 115842425A
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China
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permanent magnet
stator
rotor
pole
power
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CN202211246182.1A
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Chinese (zh)
Inventor
任泰安
张雪男
田杰
卓文伟
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Hefei University of Technology
Anhui CRRC Ruida Electric Co Ltd
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Hefei University of Technology
Anhui CRRC Ruida Electric Co Ltd
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Priority to CN202211246182.1A priority Critical patent/CN115842425A/en
Publication of CN115842425A publication Critical patent/CN115842425A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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Abstract

The invention discloses a high-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor, wherein a first permanent magnet is embedded in the inner side of a rotor, a second permanent magnet is embedded in the outer side of the rotor, the first permanent magnet and the second permanent magnet are both of single polarity, the number of the first permanent magnet and the second permanent magnet is the same as the number of the pole pairs of a control winding, and the number of the first permanent magnet and the second permanent magnet are both 2p c (ii) a The first permanent magnet and the second permanent magnetThe same polarity on the same side of the rotor and the opposite polarity on the opposite side of the rotor are the same, and the mechanical angle of the ferromagnetic magnetic pole with smaller circumferential occupation between two adjacent permanent magnets is 180 DEG/p p And the axial included angle of two adjacent permanent magnets on different sides is 60 degrees. The invention can simultaneously realize the enhancement or the weakening of the ferromagnetic magnetic poles at the inner side and the outer side of the rotor, thereby adjusting the magnetic field intensity of the air gap, having no brush structure at the rotor side and having higher reliability of the motor.

Description

High-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor
Technical Field
The invention relates to the technical field of motors, in particular to a high-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor.
Background
The rare earth permanent magnet motor has the advantages of fast dynamic response, high power density, high efficiency and the like, is widely applied in the fields of wind power generation, electric automobiles and the like, and only has a single permanent magnet excitation source inside, so that the air gap field is difficult to adjust. The electrically excited synchronous motor can adjust the air gap magnetic field intensity by changing the exciting current to realize wide speed regulation operation, but the existence of the exciting loss of the electrically excited synchronous motor causes the efficiency of the motor to be low, the high-power density and high-efficiency operation of the motor are difficult to realize, and the application is limited to a certain extent.
In order to combine the advantages of a permanent magnet synchronous motor and an electrically excited synchronous motor and overcome the respective disadvantages, a hybrid excitation synchronous motor is proposed by the scholars.
The existing mixed excitation synchronous motor can be divided into 3 types that the permanent magnet and the excitation winding are both positioned on a rotor or a stator according to the positions of the permanent magnet and the excitation winding, and the permanent magnet is positioned on the rotor and the excitation winding is positioned on the stator. The permanent magnet and the excitation winding are both positioned in the motor of the rotor, an additional device is required to be introduced to realize the brushless motor, the reliability of the motor is reduced due to the introduction of the additional device, and the further improvement of the rotating speed and the power density of the motor is limited. The motor with the permanent magnet and the excitation winding both positioned on the stator has simple structure and high running reliability of the rotor, but has low power density and efficiency. The motor with the permanent magnet positioned on the rotor and the excitation winding positioned on the stator has the advantages of high power density and efficiency, wide magnetic regulation range and the like.
Disclosure of Invention
The invention aims to overcome the defects in the background technology and provide a high-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor with higher reliability and efficiency.
In order to achieve the purpose, the invention provides a high-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor which comprises a rotor, an outer stator and an inner stator, wherein the outer stator is provided with a pole pair number p p The inner stator is provided with a pole pair number p c The control winding, be provided with a set of power winding on the outer stator, its characterized in that:
the permanent magnet I is embedded into the inner side of the rotor, the permanent magnet II is embedded into the outer side of the rotor, the permanent magnets I and the permanent magnets II are both of single polarity, the number of the permanent magnets I and the number of the permanent magnets II are the same as the number of pole pairs of the control winding, and the permanent magnets I and the permanent magnets II are both 2p c ；
The polarities of the rotors of the permanent magnet I and the permanent magnet II on the same side are the same, the polarities of the opposite sides are opposite, and the mechanical angle of the ferromagnetic magnetic pole with the smaller circumference occupation ratio between the two adjacent permanent magnets is 180 degrees/p p And the axial included angle of two adjacent permanent magnets on different sides is 60 degrees.
Further, the number of pole pairs of the power winding and the control winding satisfies p p ＝3p c And the thickness of the first permanent magnet and the second permanent magnet is the same as that of the rotor.
Furthermore, two sets of windings are arranged on the outer stator, and one set of windings is arranged on the inner stator; the number of pole pairs of two sets of windings of the outer stator satisfies p p ＝3p c (ii) a The number of pole pairs of a set of windings arranged on the inner stator and the number of pole pairs of power windings of the outer stator are the same and are all p p 。
Furthermore, the rotating speed of the magnetic field generated by the two sets of windings of the inner stator and the outer stator and the rotating speed of the rotor meet the following requirements:
60f p /p p ＝60f c /p c = n, i.e. the frequency of the control winding and the power winding satisfies f p ＝3f c 。
Furthermore, the direction of the magnetic field synthesized by the control winding is opposite to the axis of the ferromagnetic magnetic pole, and the air gap magnetic field is adjusted by changing the excitation magnitude of the control winding; the number of the outer stator slots is equal to or unequal to that of the inner stator slots, and the rotor adopts axial laminations.
Compared with the prior art, the invention has the following technical effects:
compared with the existing mixed excitation synchronous motor, the high-power-density double-stator staggered magnetic pole mixed excitation synchronous motor is characterized in that the double-stator concentric coaxial arrangement mode is adopted, the permanent magnets are distributed in the inner side and the outer side of the rotor in a staggered mode, no magnetic separation layer is arranged in the rotor, the permanent magnets on the inner side or the outer side of the rotor can enhance the ferromagnetic magnetic poles corresponding to different sides through the rotor iron core while inducing the ferromagnetic magnetic poles on the same side, so that the utilization rate of the permanent magnets is improved, the consumption of the permanent magnets is only 1/3 of that of the traditional permanent magnet motor, the cost of the motor is low, the inner space of the rotor is effectively utilized, and the axial length is random. The direction of the magnetic field synthesized by the outer stator control winding is over against the axis of the inner and outer ferromagnetic poles of the rotor, and the reinforcing or weakening of the inner and outer ferromagnetic poles of the rotor can be realized at the same time, so that the magnetic field intensity of an air gap is adjusted, a brush structure is not arranged on the side of the rotor, and the reliability of the motor is higher.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a novel high power density double-stator staggered magnetic pole hybrid excitation synchronous motor;
FIG. 2 is a structural diagram of an outer stator of the novel high-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor when the number of the outer stator slots is 36;
FIG. 3 is a structural diagram of the inner stator of the novel high power density double-stator staggered magnetic pole hybrid excitation synchronous motor when the number of the inner stator slots is 36;
FIG. 4 is a structural diagram of a novel high-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor rotor when the number of permanent magnets on the inner side and the outer side of the rotor is 2;
fig. 5 shows the magnetic line distribution of the novel high-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor at a certain moment when the rotor speed n =1000 rpm;
fig. 6 shows waveforms of first and second output voltages of the power winding of the novel high-power-density double-stator interleaved magnetic pole hybrid excitation synchronous motor when the rotor speed n =1000 rpm;
fig. 7 shows the relationship between the control winding exciting current and the first and second output voltages of the power winding of the novel high-power-density double-stator interleaved magnetic pole hybrid excitation synchronous motor when the rotor speed n =1000 rpm.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1-7, the invention discloses a high power density double-stator staggered magnetic pole hybrid excitation synchronous motor, which comprises: the rotor comprises an outer stator 7, an inner stator 2 and a rotor 1, wherein two sets of windings are arranged on the outer stator, and one set of pole pair number is p p Power winding one 8, a set of pole pairs p c The control winding 4; a set of power winding II 3 with the same number of pole pairs as the outer stator is arranged on the inner stator, and the frequencies of the currents passing through the power winding I8 and the power winding II 3 are both f p The frequency of the current passing through the control winding 4 is f c 。
2p are arranged on the inner and outer sides of the rotor c The permanent magnets 5 and 6 with single polarity have the rotor rotating speed of n, and the number of pole pairs of two sets of windings of the outer stator satisfies p p ＝3p c (ii) a The number of pole pairs of a set of windings arranged on the inner stator and the number of pole pairs of the power windings of the outer stator are the same and are all p p . The polarities of the permanent magnets on the same side of the rotor are the same, and the polarities of the permanent magnets on the different sides of the rotor are opposite; the rotating speed of the control winding, the first/second power winding for generating the magnetic field and the rotating speed of the rotor meet 60f p /p p ＝60f c /p c N, i.e. the frequency of the control winding and the power winding one/two satisfies f p ＝3f c 。
In this embodiment, one external stator is selected to control the number of pole pairs of the winding to be p c =1, the number of pole pairs of the power windings one and two is p p =3, the number of the outer stator slots is 36 in the embodiment, the structure is shown in fig. 2, the number of the inner stator slots is 36, and the structure is shown in fig. 3. The number of permanent magnets on the inner side and the outer side of the rotor is 2, the permanent magnets are magnetized in parallel, the surfaces of the permanent magnets are embedded in the inner side and the outer side of the rotor, the mechanical included angle between the permanent magnets on the different sides of the rotor is 60 degrees, and the mechanical angle of a ferromagnetic magnetic pole with smaller circumferential occupation between two adjacent permanent magnets on the same side is 180 degrees/p p The rotor permanent magnet distribution is shown in fig. 4.
In the embodiment, the initial position of the direction of the synthetic magnetic field of the control winding of the outer stator is opposite to the axes of the inner and outer ferromagnetic poles of the rotor. When the rotating speed of the rotor is n =1000rpm, in order to keep the direction of the synthetic magnetic field of the control winding 4 and the axis of the inner and outer ferromagnetic magnetic poles of the rotor unchanged all the time, the frequency of the control winding 4 needs to meet f c ＝np 1 /60=50/3Hz, and the output frequencies of the first and second power windings are both f p ＝np p 60/50Hz, namely 60f is satisfied between the rotating speed of the control winding and the rotating speed of the rotor, which generates the magnetic field by the power winding I/II p /p p ＝60f c /p c And (n). When the effective value of the exciting current of the motor control winding is 6A, and the motor runs in a magnetizing state, magnetic lines of force are distributed at a certain moment as shown in figure 5, figure 6 shows output voltage waveforms when the first power winding and the second power winding are respectively externally connected with different loads, and as can be seen from the figure, the positive linearity of the output voltage waveforms of the first power winding and the second power winding is good, and the frequency is 50Hz, so that the correctness of the theory is verified. Fig. 7 shows the relationship between the control winding exciting current and the first and second output voltages of the power winding of the high power density double-stator interleaved magnetic pole hybrid excitation synchronous motor when the rotor speed n =1000rpm, and it can be seen from the graph that the output voltages of the first and second power windings increase with the increase of the exciting current, which shows that the motor has good voltage regulation performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (6)

1. A high-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor comprises a rotor, an outer stator and an inner stator, wherein the outer stator is provided with a pole pair number p p The inner stator is provided with a pole pair number p c The control winding, be provided with a set of power winding on the outer stator, its characterized in that:
the rotor is characterized in that a first permanent magnet is embedded in the inner side of the rotor, a second permanent magnet is embedded in the outer side of the rotor, the first permanent magnet and the second permanent magnet are both of single polarity, the number of the first permanent magnet and the second permanent magnet is the same as the number of the pole pairs of the control winding, and the number of the first permanent magnet and the second permanent magnet are both 2p c ；
The polarities of the rotors of the permanent magnet I and the permanent magnet II on the same side are the same, the polarities of the opposite sides are opposite, and the mechanical angle of the ferromagnetic magnetic pole with the smaller circumference occupation ratio between the two adjacent permanent magnets is 180 degrees/p p And the axial included angle of two adjacent permanent magnets on different sides is 60 degrees.
2. The high power density dual stator interleaved pole hybrid excitation synchronous machine of claim 1 wherein the number of pole pairs of power and control windings satisfies p p ＝3p c And the thickness of the first permanent magnet and the second permanent magnet is the same as that of the rotor.
3. The high power density double stator interleaved pole hybrid excitation synchronous machine of claim 1 wherein two sets of windings are disposed on said outer stator and one set of windings is disposed on said inner stator; the number of pole pairs of two sets of windings of the outer stator satisfies p p ＝3p c (ii) a The number of pole pairs of a set of windings arranged on the inner stator and the number of pole pairs of power windings of the outer stator are the same and are all p p 。
4. The high power density double stator staggered magnetic pole hybrid excitation synchronous motor of claim 1, wherein the rotating speed of the magnetic field generated by the two sets of windings of the inner stator and the outer stator and the rotating speed of the rotor meet the following requirements:
60f p /p p ＝60f c /p c ＝n，
i.e. the frequency of the control winding and the power winding satisfies f p ＝3f c 。
5. The high power density double stator interleaved pole hybrid excitation synchronous machine of claim 1 wherein the resultant field direction of the control winding is aligned with the ferromagnetic pole axis and the air gap field is adjusted by changing the magnitude of the control winding excitation.
6. The high power density double stator interleaved pole hybrid excitation synchronous machine of claim 1 wherein the outer stator slots are equal or unequal in number to the inner stator slots and the rotor is axially laminated.
CN202211246182.1A 2022-10-12 2022-10-12 High-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor Pending CN115842425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211246182.1A CN115842425A (en) 2022-10-12 2022-10-12 High-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211246182.1A CN115842425A (en) 2022-10-12 2022-10-12 High-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor

Publications (1)

Publication Number Publication Date
CN115842425A true CN115842425A (en) 2023-03-24

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ID=85575604

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211246182.1A Pending CN115842425A (en) 2022-10-12 2022-10-12 High-power-density double-stator staggered magnetic pole hybrid excitation synchronous motor

Country Status (1)

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