CN111884473B

CN111884473B - Like-pole electrically excited linear synchronous motor

Info

Publication number: CN111884473B
Application number: CN202010714653.1A
Authority: CN
Inventors: 叶才勇; 邓聪; 张岚清; 汤伟
Original assignee: Changhang Group Wuhan Motor Co ltd; Huazhong University of Science and Technology
Current assignee: Changhang Group Wuhan Motor Co ltd; Huazhong University of Science and Technology
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2021-12-17
Anticipated expiration: 2040-07-21
Also published as: CN111884473A

Abstract

The invention discloses a same-pole electric excitation linear synchronous motor which comprises a primary pole, a secondary pole and two air gaps formed between the primary pole and the secondary pole; elementary including elementary iron core, elementary armature winding, excitation core, annular excitation winding, the secondary includes secondary back yoke iron core and iron core tooth pole array, and iron core tooth pole array divide into two sets ofly, sets up respectively in the left surface and the right flank of secondary back yoke iron core, corresponds to the elementary iron core on left side and right side, and two adjacent iron core tooth spacing in the same group are tau, and two sets of iron core tooth sets up in a staggered way, and staggered interval is tau, and the electric angle phase difference is 180 degrees. The armature winding and the annular exciting winding are concentrated on the primary winding, the secondary winding has simple structure, small eddy current loss, high efficiency and low processing cost, can realize self-suspension without mechanical contact, can ensure the length of an air gap by finely adjusting the exciting current, is suitable for occasions with larger air gaps, such as the field of high-speed magnetic suspension trains, and reduces the requirement on the track.

Description

Like-pole electrically excited linear synchronous motor

Technical Field

The invention relates to the technical field of linear synchronous motors, in particular to a linear synchronous motor with same polarity electric excitation.

Background

Along with the exploration and development of the linear motor technology, the linear motor is more and more applied to the field of transportation as a driving device. The linear motor omits an intermediate transmission coupling device, and has great advantages compared with a rotary motor. With the pursuit of speed by human beings, magnetic levitation trains become hot spots for research in the traffic field. The magnetic suspension train driven by the electrically excited linear synchronous motor has certain advantages, a magnetic circuit system of the linear synchronous motor can simultaneously generate thrust and suspension force, and a supporting device for realizing suspension does not need to be independently arranged, so that the structure of the device is simple. However, the air gap magnetic field of the current linear synchronous motor is an alternating magnetic field, which generates a large eddy current loss in the secondary, and the processing technology of the secondary structure becomes complicated and the cost increases to reduce the eddy current loss.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the same-pole electrically excited linear synchronous motor to reduce the eddy current loss generated in the secondary of the linear motor, so that the secondary structure can adopt a solid iron core, the processing technology is simple, and the problems of large eddy current loss and high processing cost of the secondary of the linear synchronous motor are solved.

In order to achieve the purpose, the invention designs a linear synchronous motor with same polarity electric excitation, which comprises a primary pole, a secondary pole and an air gap formed between the primary pole and the secondary pole; the transformer is characterized in that the primary comprises a left primary iron core, a right primary iron core and primary armature windings wound on the two primary iron cores, an annular excitation winding and an excitation iron core are arranged between the left primary iron core and the right primary iron core, and the annular excitation winding is wound on the excitation iron core; the secondary comprises a secondary back yoke iron core and an iron core tooth array, the iron core tooth array comprises left side iron core teeth and right side iron core teeth, the left side iron core teeth and the right side iron core teeth are respectively arranged on the left side surface and the right side surface of the secondary back yoke iron core and are respectively opposite to the primary left side primary iron core and the primary right side primary iron core; the left side iron core tooth and the right side iron core tooth all contain N iron core teeth, and two adjacent iron core tooth intervals are tau in every group, and two sets of iron core teeth set up in a staggered manner, and staggered interval is tau, and the electric angle phase difference is 180 degrees.

Further, the primary iron cores are all made of ferromagnetic materials, and the left primary iron core and the right primary iron core share one set of armature winding.

Further, the primary side of the motor is shorter than the secondary side, and the primary side is a rotor to perform linear motion.

Furthermore, the primary armature winding is concentrically wound on the left primary iron core and the right primary iron core in a double-layer structure.

Furthermore, the number N of the iron core teeth is a positive integer which is more than or equal to 2.

Still further, the secondary takes the form of a solid structure, made of ferromagnetic material.

Furthermore, the tooth width of the left side iron core tooth and the right side iron core tooth ranges from 0.3 tau to 0.5 tau.

Furthermore, the air gap magnetic fluxes between the left primary iron core and the left iron core tooth and between the right primary iron core and the right iron core tooth are unipolar.

The invention has the beneficial effects that:

1. the air gap magnetic field under one iron core of the electro-magnetic linear motor with the same polarity is unipolar, and the magnetic flux direction of the rotor iron core cannot be alternated, so that the rotor iron core generates small eddy current loss, the loss of the motor is reduced, the heat of the motor is reduced, and the efficiency of the motor is improved.

2. The secondary stage of the electro-magnetic homopolar linear motor provided by the invention can adopt a solid structure, does not need to adopt silicon steel sheets for laminating, and has the advantages of higher mechanical strength, simpler processing and lower processing cost.

3. The electro-magnetic linear motor with the same polarity can realize self-suspension without an independent supporting bearing system, has no mechanical contact, can ensure the length of an air gap by finely adjusting the exciting current, is suitable for occasions with larger air gaps, and reduces the requirement on a track.

Drawings

Fig. 1 is a schematic diagram of a three-dimensional structure according to the present invention.

Fig. 2 is a schematic diagram of the secondary structure of fig. 1.

Fig. 3 is a schematic view of the excitation magnetic circuit of the annular excitation winding of fig. 1.

In the figure: 1-primary, 2-secondary, 3-1-left primary core, 3-2-right primary core, 4-armature winding, 5-annular excitation winding, 6-excitation core, 7-secondary back yoke core, 8-core tooth array, 8-1-left core tooth, and 8-2-right core tooth.

Detailed Description

The present invention will be described in further detail below with reference to the drawings and specific examples, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1, the linear synchronous motor with same polarity electrical excitation provided by the present invention includes a primary 1, a secondary 2 and an air gap formed between the primary 1 and the secondary 1.

The primary 1 comprises a left primary iron core 3-1, a right primary iron core 3-2 and primary armature windings 4 wound on the two primary iron cores, and an annular excitation winding 5 and an excitation iron core 6 are arranged between the left primary iron core 3-1 and the right primary iron core 3-2. The number of the single-side iron core tooth grooves of the left primary iron core 3-1 and the right primary iron core 3-2 is 25, the left primary iron core and the right primary iron core share one set of armature winding 4, the armature winding pitch is 1, and the armature winding is wound on the primary iron cores in a concentrated mode through a double-layer structure. The excitation iron core 6 and the primary iron core are arranged in the middle of the left primary iron core and the right primary iron core in equal length, and the annular excitation winding 5 is wound on the excitation iron core 6 in a concentrated mode.

The secondary 2 comprises a secondary back yoke iron core 7 and an iron core tooth array 8, wherein the iron core tooth array 8 is divided into two groups, comprises a left side iron core tooth 8-1 and a right side iron core tooth 8-2, is respectively arranged on the left side surface and the right side surface of the secondary back yoke iron core 7, and is respectively opposite to the left side primary iron core 3-1 and the right side primary iron core 3-2 of the primary 1. Set up in the iron core tooth array 8 on secondary back yoke iron core 7 left and right sides all contain 4 iron core teeth, and two adjacent iron core tooth spacing are tau in the same group, and tau is the polar distance, and 0.3 ~ 0.5 tau is got to iron core tooth width, and two sets of iron core tooth 8 are crisscross to be set up, and the interval of staggering is tau, and the electric angle phase difference is 180 degrees. In order to reduce the magnetic leakage of the tooth part and increase the air gap flux density, the teeth of the iron core tooth array 8 are all in a structure with a trapezoidal section.

Primary 1 and secondary 2 of the same-pole electric excitation linear synchronous motor are both made of ferromagnetic materials with solid structures, a short primary long secondary structure is adopted, and the primary 1 is a rotor and moves linearly.

The working principle of the same-polarity electro-magnetic linear synchronous motor provided by the invention is shown in fig. 3, a direct-current exciting current is electrified in an annular exciting winding 7, and a closed magnetic circuit formed by magnetic flux is as follows: the field core 6 → the left primary core 3-1 → the left air gap → the left core tooth 8-1 → the back yoke core 7 → the right core tooth 8-2 → the right air gap → the right primary core 3-2 → the field core 6. The magnetic flux direction of the air gap at one side is a constant direction, namely the air gap magnetic flux under the same iron core is unipolar, so that the eddy current loss generated in the secondary 2 iron core is greatly reduced, and the motor efficiency is improved. The secondary teeth 8-1a and 8-2a and the secondary slots 8-1b and 8-2b on the same side of the single-side air gap magnetic field fundamental wave are represented by two different polarities, and can be regarded as N, S poles which are alternated. When three-phase symmetrical sine alternating current is introduced into the primary armature winding 3, the secondary 2 which generates electromagnetic thrust and suspension force to the primary 1 under the combined action of the generated air gap traveling wave magnetic field and the electric excitation magnetic pole magnetic field is a stator, and the speed of the movement of the primary 1 is the same as that of the traveling wave magnetic field.

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

Finally, it should be noted that the above detailed description is only for illustrating the technical solution of the patent and not for limiting, although the patent is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the patent can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the patent, which should be covered by the claims of the patent.

Claims

1. A linear synchronous motor with same polarity electric excitation comprises a primary (1), a secondary (2) and an air gap formed between the primary (1) and the secondary (2); the method is characterized in that:

the primary winding (1) comprises a left primary iron core (3-1), a right primary iron core (3-2) and primary armature windings (4) wound on the two primary iron cores, an annular excitation winding (5) and an excitation iron core (6) are arranged between the left primary iron core (3-1) and the right primary iron core (3-2), and the annular excitation winding (5) is wound on the excitation iron core (6);

the secondary (2) comprises a secondary back yoke iron core (7) and an iron core tooth array (8), the iron core tooth array (8) comprises a left iron core tooth (8-1) and a right iron core tooth (8-2), the teeth of the iron core tooth array (8) are of a trapezoidal section structure, and the left iron core tooth (8-1) and the right iron core tooth (8-2) are respectively arranged on the left side surface and the right side surface of the secondary back yoke iron core (7) and are respectively opposite to the left primary iron core (3-1) and the right primary iron core (3-2) of the primary (1); the left side iron core teeth (8-1) and the right side iron core teeth (8-2) both comprise N iron core teeth, the distance between every two adjacent iron core teeth in each group is tau, the two groups of iron core teeth are arranged in a staggered mode, the staggered distance is tau, and the electric angle difference is 180 degrees.

2. A like-pole electrically excited linear synchronous machine as claimed in claim 1, wherein: the iron core of the primary (1) is made of ferromagnetic materials, and the left primary iron core (3-1) and the right primary iron core (3-2) share one set of armature winding.

3. A like-pole electrically excited linear synchronous machine as claimed in claim 1, wherein: the primary (1) of the motor is shorter than the secondary (2), and the primary (1) is a rotor to perform linear motion.

4. A like-pole electrically excited linear synchronous machine as claimed in claim 2, wherein: the primary armature winding (4) is intensively wound on the left primary iron core (3-1) and the right primary iron core (3-2) by adopting a double-layer structure.

5. A like-pole electrically excited linear synchronous machine as claimed in claim 1, wherein: the number N of the iron core teeth is a positive integer more than or equal to 2.

6. A like-pole electrically excited linear synchronous machine as claimed in claim 1, wherein: the secondary (2) is of solid construction and is made of ferromagnetic material.

7. A like-pole electrically excited linear synchronous machine as claimed in claim 1, wherein: the tooth width of the left iron core tooth (8-1) and the right iron core tooth (8-2) ranges from 0.3 tau to 0.5 tau.

8. A like-pole electrically excited linear synchronous machine as claimed in claim 2, wherein: and the air gap magnetic flux between the left primary iron core (3-1) and the left iron core tooth (8-1) and between the right primary iron core (3-2) and the right iron core tooth (8-2) is unipolar.