High-salient-pole-ratio cylindrical synchronous reluctance linear motor and working method

Abstract

The invention discloses a high-salient-pole-ratio cylindrical synchronous reluctance linear motor and a working method, and belongs to the technical field of cylindrical linear motors, the high-salient-pole-ratio cylindrical synchronous reluctance linear motor comprises a stator and a mover, the stator and the mover are both of a cylindrical structure, and a working air gap is formed between the stator and the mover; the stator comprises a plurality of stator iron core units arranged in the axial direction, annular stator windings are arranged in gaps between the adjacent stator iron core units, and each stator iron core unit is composed of a stator yoke and a stator lamination iron core. The mover comprises mover iron core units and magnetic isolation rings, the mover iron core units and the magnetic isolation rings are arranged on the non-magnetic shaft in a staggered and nested mode in the axial direction, each mover iron core unit comprises a mover laminated iron core and a magnetic conduction ring, and the mover laminated iron cores are arranged at the two ends of the magnetic conduction ring in a sleeving mode; and the total axial lengths of the stator and the rotor are different. The cylindrical linear motor can be well applied to working occasions with high requirements on the efficiency and the reliability of the cylindrical linear motor.

Description

Technical Field

[0001] The present invention relates to the technical field of tubular linear motors, and in particular to a tubular synchronous reluctance linear motor with a high pole ratio and a working method thereof. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] As a special structure of linear motors, tubular linear motors have many advantages such as being easy to overcome unilateral magnetic pull force, having no lateral end effect, and high winding utilization rate, showing broad application prospects in many fields such as deep-sea oil extraction, machine tools, robots and automation equipment, medical equipment, and aerospace.

[0004] However, currently, tubular linear motors mainly include induction linear motors and permanent magnet linear motors. Induction linear motors have difficulties in speed regulation and low efficiency and power factor, while permanent magnet linear motors have high costs, serious rotor heating during high-speed operation, and the permanent magnets are extremely prone to fracture and irreversible demagnetization. Therefore, the above two types of tubular linear motors are not suitable for working occasions with high requirements for efficiency and reliability. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a tubular synchronous reluctance linear motor with a high pole ratio and a working method thereof, which has the advantages of high thrust density, low manufacturing cost, good processability, and high reliability, and can be well applied to working occasions with high requirements for motor efficiency and reliability.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect of the present invention, a tubular synchronous reluctance linear motor with a high pole ratio is provided, including a stator and a mover. Both the stator and the mover are of a tubular structure, and there is a working air gap between them.

[0008] The stator includes a plurality of stator core units arranged axially. A circular stator winding is provided in the gap between adjacent stator core units. The stator core unit is composed of a stator yoke and a stator laminated core.

[0009] The mover includes a mover core unit and a magnetic isolation ring. The mover core unit and the magnetic isolation ring are axially staggered and nested on a non-magnetic shaft. The mover core unit includes a mover laminated core and a magnetic conducting ring. The mover laminated core is sleeved at both ends of the magnetic conducting ring.

[0010] The total axial lengths of the stator and the mover are different.

[0011] As a further implementation manner, a casing is arranged outside the stator. The material of the casing is a non-magnetic material, and the casing encapsulates the entire motor inside it.

[0012] As a further implementation manner, both the stator laminated core and the rotor laminated core are formed by laminating circular silicon steel sheets.

[0013] As a further implementation manner, the stator yoke is made of a circular soft magnetic composite material.

[0014] As a further implementation manner, cylindrical shielding sleeves are arranged on the inner side of the stator and the outer side of the rotor. The cylindrical shielding sleeves are made of stainless steel materials.

[0015] As a further implementation manner, the magnetic conduction ring is made of a magnetic conduction material, and the magnetic isolation ring and the non-magnetic shaft are both made of non-magnetic materials.

[0016] As a further implementation manner, the cylindrical stator remains stationary, and the cylindrical rotor makes a reciprocating linear motion.

[0017] As a further implementation manner, the non-magnetic shaft is connected to the outside to output mechanical energy.

[0018] In the second aspect of the present invention, a working method of a high salient-pole ratio cylindrical synchronous reluctance linear motor is provided. Based on the high salient-pole ratio cylindrical synchronous reluctance linear motor described in the first aspect of the present invention, it includes:

[0019] Three-phase alternating current is passed through the stator winding to generate an armature magnetic field. The magnetic lines of force pass through the stator yoke and the stator laminated core and then pass through the air gap into the rotor laminated core. After passing through the magnetic conduction ring and the rotor laminated core, they pass through the air gap again and return to the stator laminated core to form a closed loop;

[0020] When the stator winding is energized, the change in magnetic reluctance caused by the cylindrical rotor at different positions generates a magnetic reluctance thrust.

[0021] As a further implementation manner, the dimensional parameters of the rotor laminated core, the magnetic conduction ring, the magnetic isolation ring, and the non-magnetic shaft can be flexibly adjusted.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] All the stator components and rotor components of the high salient-pole ratio cylindrical synchronous reluctance linear motor of the present invention adopt a ring structure, which has good processability, convenient assembly, and low manufacturing cost. There are no windings and permanent magnets on the rotor of the motor, which can adapt to high-temperature operating environments and has high reliability.

[0024] The mover of the high salient-pole ratio cylindrical synchronous reluctance linear motor of the present invention eliminates the magnetic bridge structure that severely restricts the salient-pole ratio, and a non-magnetic quadrature magnetic isolation ring is arranged at the d-axis position. Cooperating with the non-magnetic shaft, the quadrature-axis inductance is greatly reduced, the salient-pole ratio of the motor is significantly increased, and thus the thrust density and power factor of the motor are effectively increased. Therefore, the motor of the present invention has the advantages of high thrust density, low manufacturing cost, good processability and high reliability, and can be well applied to working occasions with high requirements for motor efficiency and reliability.

[0025] Both the outer side of the mover and the inner side of the stator of the high salient-pole ratio cylindrical synchronous reluctance linear motor of the present invention are provided with shielding sleeves made of stainless steel to protect the stator and the mover, and the corrosion resistance of the stator and the mover is significantly enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0027] Figure 1 is a schematic three-dimensional structure diagram of a high salient-pole ratio cylindrical synchronous reluctance linear motor of the present invention;

[0028] Figure 2 is a schematic three-dimensional structure diagram of the stator core unit of the motor of the present invention;

[0029] Figure 3 is a schematic three-dimensional structure diagram of the mover core unit of the motor of the present invention;

[0030] Figure 4 is a schematic structure diagram of the front view of a high salient-pole ratio cylindrical synchronous reluctance linear motor of the present invention.

[0031] Wherein, 1, stator yoke; 2, stator laminated core; 3, stator winding; 4, machine shell; 5, mover laminated core; 6, magnetic conduction ring; 7, magnetic isolation ring; 8, non-magnetic shaft; 9, shielding sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0034] Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0035] Embodiment 1

[0036] As Figure 1 and Figure 4 shown, this embodiment provides a high salient-pole ratio cylindrical synchronous reluctance linear motor, which includes a stator and a mover. Both the stator and the mover are of cylindrical structure, and there is a working air gap between them.

[0037] The stator includes a plurality of stator core units arranged axially. A circular stator winding 3 is provided in the gap between adjacent stator core units. The stator core unit is composed of a stator yoke 1 and a stator laminated core 2.

[0038] The mover includes a mover core unit and a magnetic isolation ring 7. The mover core unit and the magnetic isolation ring 7 are arranged axially and nested on a non-magnetic shaft 8. The mover core unit includes a mover laminated core 5 and a magnetic conduction ring 6. The mover laminated core 5 is sleeved at both ends of the magnetic conduction ring 6. The total axial lengths of the stator and the mover are different.

[0039] As Figure 2 and Figure 3 shown, the cylindrical stator includes a stator yoke 1, a stator laminated core 2, a stator winding 3 and a housing 4. The cylindrical mover includes a mover laminated core 5, a magnetic conduction ring 6, a magnetic isolation ring 7 and a non-magnetic shaft 8.

[0040] The stator yoke 1 is made of a circular soft magnetic composite material. The stator laminated core 2 is formed by laminating circular silicon steel sheets. The two are fixed together to form a stator core unit, as Figure 2 shown.

[0041] The stator winding 3 is a pancake winding, also known as a circular winding, and is placed in the gap between adjacent stator core units.

[0042] A housing 4 is provided outside the cylindrical stator. The housing 4 is made of a non-magnetic material and encapsulates the entire motor.

[0043] A number of stator core units are arranged axially (twenty-four in Figure 1 ), forming a cylindrical stator core with good magnetic conduction performance and low iron loss.

[0044] The mover laminated core 5 is formed by laminating circular silicon steel sheets. Two circular mover laminated cores 5 are sleeved at both ends of the same magnetic conduction ring 6 to form a mover core unit, as Figure 3 shown.

[0045] A number of mover core units (eight in Figure 1 ) and a number of magnetic isolation rings 7 (seven in Figure 1 ) are axially and alternately nested on the non-magnetic shaft 8, forming a cylindrical mover with a simple structure and good processability.

[0046] There are shielding sleeves 9 made of stainless steel on both the outside of the mover and the inside of the stator to protect the stator and the mover and enhance the corrosion resistance of the stator and the mover.

[0047] Both the stator assembly and the mover assembly adopt an annular structure, which has good processability, is convenient for assembly, and has low manufacturing costs;

[0048] When three-phase alternating current is applied to the stator winding 3, an armature magnetic field is generated. The magnetic force lines pass through the stator yoke 1 and the stator laminated core 2, then pass through the air gap and enter the mover laminated core 5. After passing through the magnetic conduction ring 6 and the mover laminated core 5, they pass through the air gap again and return to the stator laminated core 2 to form a closed loop. When the stator winding 3 is energized, the change in magnetic reluctance caused by the cylindrical mover at different positions generates a magnetic reluctance thrust.

[0049] In this embodiment, the total axial length of the cylindrical stator is not the same as the total axial length of the cylindrical mover. The total axial length of the cylindrical stator is greater than the axial length of the cylindrical mover; or, less than the axial length of the cylindrical mover.

[0050] In this embodiment, when the motor is working, the cylindrical stator remains stationary, the cylindrical mover makes a reciprocating linear motion, and the non-magnetic shaft 8 is connected to the outside to output mechanical energy.

[0051] In this embodiment, the dimensional parameters of the mover laminated core 5, the magnetic conduction ring 6, the magnetic isolation ring 7, and the non-magnetic shaft 8 can be flexibly adjusted to obtain the optimal motor performance.

[0052] In this embodiment, there are no windings and permanent magnets on the mover of the high salient-pole ratio cylindrical synchronous reluctance linear motor, which can adapt to high-temperature operating environments and has high reliability;

[0053] In this embodiment, the mover of the high salient-pole ratio cylindrical synchronous reluctance linear motor cancels the magnetic bridge structure that severely restricts the salient-pole ratio, and a non-magnetic cross-axis magnetic isolation ring 7 is arranged at the d-axis position, as Figure 4 shown. The magnetic isolation ring 7 cooperates with the non-magnetic shaft 8, greatly reducing the q-axis inductance, significantly increasing the salient-pole ratio of the motor, and thus effectively increasing the thrust density and power factor of the motor.

[0054] Embodiment 2

[0055] This embodiment provides a working method for a high salient-pole ratio cylindrical synchronous reluctance linear motor, based on a high salient-pole ratio cylindrical synchronous reluctance linear motor in Embodiment 1.

[0056] When three-phase alternating current is applied to the stator winding, an armature magnetic field is generated. The magnetic force lines pass through the stator yoke and the stator laminated core and then pass through the air gap and enter the mover laminated core. After passing through the magnetic conduction ring and the mover laminated core, they pass through the air gap again and return to the stator laminated core to form a closed loop;

[0057] When the stator winding is energized, the change in reluctance caused by the cylindrical rotor at different positions generates a reluctance thrust.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0059] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A high salient pole ratio cylindrical synchronous reluctance linear motor, characterized in that It includes a stator and a mover. Both the stator and the mover are of cylindrical structure, and there is a working air gap between them. The stator includes a plurality of stator core units arranged axially. A circular stator winding is provided in the gap between adjacent stator core units. The stator core unit is composed of a stator yoke and a stator laminated core. The mover includes a mover core unit and a magnetic isolation ring. The mover core unit and the magnetic isolation ring are arranged axially and nested on a non-magnetic shaft in an alternating manner. The mover core unit includes a mover laminated core and a magnetic conduction ring. The mover laminated core is sleeved at both ends of the magnetic conduction ring. The total axial lengths of the stator and the mover are different.

2. The high salient pole ratio cylindrical synchronous reluctance linear motor according to claim 1, wherein A machine shell is provided outside the stator. The material of the machine shell is a non-magnetic conductive material, and the machine shell encapsulates the entire motor inside it.

3. The high salient pole ratio cylindrical synchronous reluctance linear motor according to claim 1, characterized in that, Both the stator laminated core and the mover laminated core are laminated from circular silicon steel sheets.

4. The high salient pole ratio cylindrical synchronous reluctance linear motor according to claim 1, characterized in that, The stator yoke is made of a circular soft magnetic composite material.

5. The high salient pole ratio cylindrical synchronous reluctance linear motor according to claim 1, characterized in that, Cylindrical shielding sleeves are provided on the inner side of the stator and the outer side of the mover. The cylindrical shielding sleeves are made of stainless steel materials.

6. The high salient pole ratio cylindrical synchronous reluctance linear motor according to claim 1, wherein, The magnetic conduction ring is made of a magnetic conductive material, and both the magnetic isolation ring and the non-magnetic shaft are made of non-magnetic conductive materials.

7. The high salient pole ratio cylindrical synchronous reluctance linear motor according to claim 1, wherein The cylindrical stator remains stationary, and the cylindrical mover makes a reciprocating linear motion.

8. A high salient pole ratio cylindrical synchronous reluctance linear motor according to claim 1, wherein, The non-magnetic shaft is connected to the outside to output mechanical energy.

9. A working method of a high salient pole ratio cylindrical synchronous reluctance linear motor, characterized in that, Based on a high salient pole ratio cylindrical synchronous reluctance linear motor according to any one of claims 1-8, including: Three-phase alternating current is passed through the stator winding to generate an armature magnetic field. The magnetic lines of force pass through the stator yoke and the stator laminated core and then pass through the air gap into the mover laminated core. After passing through the magnetic conduction ring and the mover laminated core, they pass through the air gap again and return to the stator laminated core to form a closed loop. When the stator winding is energized, the change in magnetic reluctance caused by the cylindrical mover at different positions generates a magnetic reluctance thrust.

10. The working method of a high salient pole ratio cylindrical synchronous reluctance linear motor as claimed in claim 9, wherein The dimensional parameters of the mover laminated core, the magnetic conduction ring, the magnetic isolation ring, and the non-magnetic shaft can be adjusted flexibly.

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