CN209963929U - Write pole type magnetic field modulation permanent magnet motor - Google Patents
Write pole type magnetic field modulation permanent magnet motor Download PDFInfo
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- CN209963929U CN209963929U CN201921080425.2U CN201921080425U CN209963929U CN 209963929 U CN209963929 U CN 209963929U CN 201921080425 U CN201921080425 U CN 201921080425U CN 209963929 U CN209963929 U CN 209963929U
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Abstract
The utility model discloses a double-stator write pole type magnetic field modulation permanent magnet motor, which comprises a first stator, a rotor and a second stator which are coaxially and concentrically arranged and move relatively; a first air gap is arranged between the first stator and the rotor; a second air gap is arranged between the rotor and the second stator; the first stator is provided with first stator teeth, the first stator teeth are provided with low-coercivity permanent magnets, a first stator slot is formed between every two adjacent first stator teeth, and a first stator armature winding is arranged in each first stator slot; the rotor comprises rotor cores, and a high-coercivity permanent magnet is embedded between every two adjacent rotor cores; second stator teeth are arranged on the second stator, second stator slots are formed between the adjacent second stator teeth, and second stator armature windings are embedded in the second stator slots. The utility model provides a two stator PMSM pass through the pole function of writing on line of first stator winding, adjust low coercive force magnetization state, can promote traditional PMSM's weak magnetism speed governing ability.
Description
Technical Field
The utility model relates to a permanent-magnet machine technical field especially relates to a write pole formula magnetic field modulation permanent-magnet machine with magnetic field modulation function.
Background
The permanent magnet motor has the advantages of high efficiency, high power density, high control precision and the like, and is widely applied to industry, agriculture, national defense and daily life.
However, the permanent magnet in the permanent magnet motor is constantly excited, and how to extend the high-speed constant power/weak magnetic range of the permanent magnet motor without obviously reducing the high-speed torque becomes a difficult problem in the field of design and control of the permanent magnet motor. The traditional permanent magnet motor generally adopts a weak magnetic control method to expand the speed, and although the rotation speed of the permanent magnet motor can be expanded to a certain extent by the weak magnetic control, the copper consumption of the motor can be increased by continuous direct-axis demagnetizing current, and the operation efficiency of the motor in a high-speed area is reduced.
Therefore, how to adjust the air gap field of the permanent magnet motor becomes a research hotspot in the field of the motor in recent years. The feasible scheme is to adopt a hybrid excitation technology, which introduces electric excitation on the basis of a permanent magnet motor, realizes the adjustment of the air gap flux of the motor by adjusting the size and the direction of electric excitation current, has the advantages of convenient magnetic adjustment, high efficiency and the like, but has the obvious defects at the same time: the hybrid excitation motor usually adopts a parallel magnetic circuit or a series magnetic circuit, but the permanent magnet of the hybrid excitation motor has more magnetic leakage, and the electric excitation loss of the hybrid excitation motor is larger, so the hybrid excitation motor is not a perfect solution.
Disclosure of Invention
The utility model aims at providing a through adjusting low coercive force magnetization state, can promote the permanent-magnet machine of traditional PMSM's weak magnetism speed governing ability.
In order to achieve the above object, the present invention provides a double-stator write-pole type magnetic field modulation permanent magnet motor, which comprises a first stator, a rotor and a second stator, which are coaxially and concentrically arranged from outside to inside and move relatively;
a first air gap is arranged between the first stator and the rotor;
a second air gap is arranged between the rotor and the second stator;
the first stator comprises a first stator back yoke, first stator teeth are arranged on the first stator back yoke, a low-coercive-force permanent magnet is embedded into the end of each first stator tooth, a first stator slot is formed by a gap between every two adjacent first stator teeth, and a first stator armature winding is embedded into each first stator slot;
the rotor comprises rotor cores, and high-coercivity permanent magnets are embedded between every two adjacent rotor cores;
the second stator comprises a second stator back yoke, second stator teeth are arranged on the second stator back yoke, a second stator slot is formed in a gap between every two adjacent second stator teeth, and a second stator armature winding is embedded in each second stator slot.
Preferably, the low coercivity permanent magnet is radially magnetized.
Preferably, the high-coercivity permanent magnet is embedded into the rotor in a spoke arrangement mode, and is magnetized tangentially alternately along the circumference to form a magnetism gathering structure.
Preferably, the first stator armature winding adopts a concentrated winding and is powered by a direct current pulse power supply.
Preferably, the second stator armature winding is connected in a distributed winding mode and is powered by an alternating current power supply.
Preferably, the low-coercivity permanent magnet or the high-coercivity permanent magnet is made of any one of ferrite, alnico, samarium cobalt and neodymium iron boron.
In order to achieve the above object, the present invention provides a dual-rotor write-pole type magnetic field modulation permanent magnet motor, which comprises a first rotor, a stator, and a second rotor, which are coaxially and concentrically arranged from outside to inside and move relatively;
a first air gap is arranged between the first rotor and the stator;
a second air gap is arranged between the stator and the second rotor;
the first rotor comprises a first rotor iron core, first rotor teeth are arranged on the first rotor iron core, a low-coercivity permanent magnet is embedded into the end of each first rotor tooth, a gap between every two adjacent first rotor teeth forms a first rotor slot, and a first rotor armature winding is embedded into each first rotor slot;
the stator comprises stator cores, and high-coercivity permanent magnets are embedded between every two adjacent stator cores;
the second rotor comprises a second rotor iron core, second rotor teeth are arranged on the second rotor iron core, a second rotor groove is formed in a gap between every two adjacent second rotor teeth, and a second rotor armature winding is embedded into each second rotor groove.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model adopts the parallel excitation mode of the high coercive force permanent magnet and the low coercive force permanent magnet, under the condition of not increasing the capacity of the inverter, the non-linear hysteresis characteristic of the high remanence low coercive force permanent magnet is utilized, the magnetization state of the permanent magnet is changed by applying charging and demagnetizing pulse current through the outer stator winding, and the online pole writing or magnetic adjustment of the permanent magnet motor is realized; because the cross coupling effect of the two permanent magnets causes the mutual influence factors of the design parameters of the motor to be complex, the decoupling design of the structure is realized by adopting the fixed-rotation independent excitation mode of the two permanent magnets; meanwhile, the high-coercivity permanent magnet is embedded into the rotor core in a spoke arrangement mode, and the torque transfer capacity of the motor can be further improved due to the additional effect of the air gap effective harmonic magnetic field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a double-stator write pole type magnetic field modulation permanent magnet motor according to an embodiment of the present invention;
description of the symbols: 1-first stator, 2-rotor, 3-first air gap, 4-second air gap, 5-second stator, 11-first stator back yoke, 12-first stator tooth, 13-low coercivity permanent magnet, 14-first stator armature winding, 21-rotor core, 22-high coercivity permanent magnet, 51-second stator back yoke, 52-second stator tooth, 53 second stator armature winding.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a permanent-magnet machine that high coercivity permanent magnet and low coercivity permanent magnet independently excited, realized air gap field regulation through changing the permanent magnet magnetization level.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the double-stator write-pole type magnetic field modulation permanent magnet motor of the present invention specifically includes a first stator 1, a rotor 2, and a second stator 5 coaxially and concentrically arranged from outside to inside in sequence;
a first air gap 3 is arranged between the first stator 1 and the rotor 2;
a second air gap 4 is arranged between the rotor 2 and the second stator 5;
the first stator 1 comprises a first stator back yoke 11, first stator teeth 12 are arranged on the first stator back yoke 11, a low-coercive-force permanent magnet 13 is embedded into the end of each first stator tooth 12, a first stator slot is formed by a gap between every two adjacent first stator teeth 12, and a first stator armature winding 14 is embedded into each first stator slot;
the rotor 2 comprises rotor cores 21, and high-coercivity permanent magnets 22 are embedded between every two adjacent rotor cores 21;
the second stator 5 includes a second stator back yoke 51, the second stator back yoke 51 is provided with second stator teeth 52, a gap between two adjacent second stator teeth 52 forms a second stator slot, and a second stator armature winding 53 is embedded in each second stator slot.
The arrangement mode of the first stator 1, the rotor 2 and the second stator 5 is that the first stator 1, the rotor 2 and the second stator 5 are arranged from outside to inside in sequence or the first stator 1, the rotor 2 and the second stator 5 are arranged from inside to outside in sequence.
The low coercive force permanent magnet 13 is magnetized in the radial direction; the high-coercivity permanent magnets 22 are embedded in the rotor 2 in a spoke arrangement mode, and are magnetized tangentially alternately along the circumference to form a magnetism gathering structure.
The first stator armature winding 14 adopts a concentrated winding and is powered by a direct-current pulse power supply; the second stator armature winding 53 is supplied with power from an ac power source in a distributed winding connection.
The low-coercivity permanent magnet or the high-coercivity permanent magnet is made of any one of ferrite, alnico, samarium cobalt and neodymium iron boron.
In addition, the utility model also provides a birotor write-pole type magnetic field modulation permanent magnet motor, which specifically comprises a first rotor, a stator and a second rotor which are coaxially and concentrically arranged from outside to inside and move relatively;
a first air gap is arranged between the first rotor and the stator;
a second air gap is arranged between the stator and the second rotor;
the first rotor comprises a first rotor iron core, first rotor teeth are arranged on the first rotor iron core, a low-coercivity permanent magnet is embedded into the end of each first rotor tooth, a gap between every two adjacent first rotor teeth forms a first rotor slot, and a first rotor armature winding is embedded into each first rotor slot;
the stator comprises stator cores, and high-coercivity permanent magnets are embedded between every two adjacent stator cores;
the second rotor comprises a second rotor iron core, second rotor teeth are arranged on the second rotor iron core, a second rotor groove is formed in a gap between every two adjacent second rotor teeth, and a second rotor armature winding is embedded into each second rotor groove.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation mode of the invention are explained by applying a specific example; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (7)
1. A double-stator write pole type magnetic field modulation permanent magnet motor is characterized by comprising a first stator, a rotor and a second stator which are coaxially and concentrically arranged from outside to inside in sequence and move relatively;
a first air gap is arranged between the first stator and the rotor;
a second air gap is arranged between the rotor and the second stator;
the first stator comprises a first stator back yoke, first stator teeth are arranged on the first stator back yoke, a low-coercive-force permanent magnet is embedded into the end of each first stator tooth, a first stator slot is formed by a gap between every two adjacent first stator teeth, and a first stator armature winding is embedded into each first stator slot;
the rotor comprises rotor cores, and high-coercivity permanent magnets are embedded between every two adjacent rotor cores;
the second stator comprises a second stator back yoke, second stator teeth are arranged on the second stator back yoke, a second stator slot is formed in a gap between every two adjacent second stator teeth, and a second stator armature winding is embedded in each second stator slot.
2. The dual stator write pole field modulated permanent magnet machine of claim 1, wherein the low coercivity permanent magnets are radially magnetized.
3. The double stator write pole field modulated permanent magnet machine of claim 1 wherein said high coercivity permanent magnets are embedded in said rotor in a spoke arrangement and are alternately magnetized tangentially along a circumference to form a flux concentrating structure.
4. A double stator write pole field modulated permanent magnet machine according to claim 1 wherein the first stator armature winding is a concentrated winding powered by a dc pulse power supply.
5. A double stator write pole field modulated permanent magnet machine according to claim 1 wherein the second stator armature winding is fed from an ac source using a distributed winding connection.
6. A dual stator write pole field modulated permanent magnet machine according to claim 1, wherein the low coercivity permanent magnet or the high coercivity permanent magnet material is any one of ferrite, alnico, samarium cobalt, neodymium iron boron.
7. A double-rotor write pole type magnetic field modulation permanent magnet motor is characterized by comprising a first rotor, a stator and a second rotor which are coaxially and concentrically arranged from outside to inside in sequence and move relatively;
a first air gap is arranged between the first rotor and the stator;
a second air gap is arranged between the stator and the second rotor;
the first rotor comprises a first rotor iron core, first rotor teeth are arranged on the first rotor iron core, a low-coercivity permanent magnet is embedded into the end of each first rotor tooth, a gap between every two adjacent first rotor teeth forms a first rotor slot, and a first rotor armature winding is embedded into each first rotor slot;
the stator comprises stator cores, and high-coercivity permanent magnets are embedded between every two adjacent stator cores;
the second rotor comprises a second rotor iron core, second rotor teeth are arranged on the second rotor iron core, a second rotor groove is formed in a gap between every two adjacent second rotor teeth, and a second rotor armature winding is embedded into each second rotor groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921080425.2U CN209963929U (en) | 2019-07-11 | 2019-07-11 | Write pole type magnetic field modulation permanent magnet motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921080425.2U CN209963929U (en) | 2019-07-11 | 2019-07-11 | Write pole type magnetic field modulation permanent magnet motor |
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| CN209963929U true CN209963929U (en) | 2020-01-17 |
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| CN201921080425.2U Active CN209963929U (en) | 2019-07-11 | 2019-07-11 | Write pole type magnetic field modulation permanent magnet motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266166A (en) * | 2019-07-11 | 2019-09-20 | 兰州理工大学 | A kind of write pole formula magnetic field modulation magneto |
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- 2019-07-11 CN CN201921080425.2U patent/CN209963929U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266166A (en) * | 2019-07-11 | 2019-09-20 | 兰州理工大学 | A kind of write pole formula magnetic field modulation magneto |
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