CN101789675A - Secondary of cylindrical permanent-magnet linear motor - Google Patents

Abstract

The utility model relates to a secondary of a cylindrical permanent magnet linear motor, which belongs to the technical field of motors. It solves the problem of low air gap magnetic density caused by the large air gap reluctance of the existing permanent magnet linear motor. The secondary is an axisymmetric structure, which includes a plurality of iron cores and a plurality of permanent magnets, the outer sleeve and inner sleeve or cylinder are made of non-magnetic materials, and the iron cores and permanent magnets are ring-shaped, Multiple iron cores and multiple permanent magnets are closely arranged and fixed between the outer sleeve and the inner sleeve or cylinder. On the secondary radial section, every two adjacent permanent magnets form a positive V shape or an inverted V shape. , the angle between two adjacent permanent magnets is B, and the value range of the angle B is (0°, 180°), four consecutive adjacent permanent magnets that form a W shape and the iron in the middle The core forms a pair of magnetic poles, and the included angle between the central axis of the inner sleeve or cylinder and the magnetization direction of a permanent magnet in each pair of magnetic poles is: A ₁ =B/2, A ₂ =180°-B/ 2, A ₃ =180°+B/2, A ₄ =360°-B/2. The invention is applicable to the existing cylindrical permanent magnet linear motor.

Description

Secondary of a cylindrical permanent magnet linear motor

technical field

The invention relates to a secondary structure of a cylindrical permanent magnet linear motor, which belongs to the technical field of motors.

Background technique

Now, the direct transmission technology based on linear motors eliminates the need for intermediate complex transmission mechanisms, and has been applied in linear motion occasions such as machine tools and elevators, and its application fields are gradually expanding to various fields of production and life. Among them, the cylindrical linear motor has the advantages of high winding utilization rate, no transverse end winding, no unilateral magnetic pull, etc., and has high practical value in linear motion occasions. The cylindrical linear motor with no slot structure has no cogging effect and small thrust fluctuation, but due to the increase of the physical air gap, the air gap reluctance is large and the air gap magnetic density is reduced. Therefore, in order to increase the air gap magnetic flux density , it is necessary to increase the thickness of the permanent magnet appropriately, and it is expected that the magnetic flux area of the permanent magnet will increase.

Contents of the invention

In order to solve the problem of low air gap magnetic density caused by the large air gap reluctance of the existing permanent magnet linear motor, a secondary of a cylindrical permanent magnet linear motor is proposed.

The secondary of a cylindrical permanent magnet linear motor of the present invention is an axisymmetric structure, which includes a plurality of iron cores, an outer sleeve, an inner sleeve or a cylinder and a plurality of permanent magnets, the outer sleeve and the inner sleeve The sleeve or cylinder is made of non-magnetic material, the iron core and permanent magnet are ring-shaped, multiple iron cores and multiple permanent magnets are fixed between the outer sleeve and the inner sleeve or cylinder, and multiple iron The core and a plurality of permanent magnets are closely arranged. On the secondary radial section, every two adjacent permanent magnets form a positive V shape or an inverted V shape, and the angle between two adjacent permanent magnets is B. The value range of the included angle B is (0°, 180°), four consecutive adjacent permanent magnets form a W shape, and the four consecutive adjacent permanent magnets and the iron core in the middle form a pair of magnetic poles , the included angle between the central axis of the inner sleeve or cylinder and the magnetization direction of the first permanent magnet in each pair of magnetic poles is: A ₁ = B /2, A ₂ =180°- B /2, A ₃ =180°+ B /2, A ₄ =360°- B /2.

The permanent magnets in the secondary structure of the present invention are placed at a certain angle to the radial direction of the motor, so that more permanent magnets can be placed in a certain space. In the present invention, there is an iron core between the two permanent magnets in each pole, and in the case of increasing the volume of a small amount of permanent magnets, the magnetic flux produced by the two permanent magnets under each pole is directed to the iron core in the middle. Magnetic concentration increases the magnetic flux area and magnetic potential emitted by the permanent magnet, and increases the air gap magnetic flux density, thereby achieving the technical effect of increasing the thrust density of the motor.

The secondary of the cylindrical permanent magnet linear motor of the present invention is suitable for the existing cylindrical permanent magnet linear motor.

Description of drawings

Fig. 1 is a structural schematic diagram of a secondary cylindrical permanent magnet linear motor adopting the present invention. Fig. 2 is a schematic structural diagram of the secondary side of the cylindrical permanent magnet linear motor of the present invention. Fig. 3 A-A sectional view of Fig. 2 . FIG. 4 is a schematic structural diagram of a pair of magnetic poles described in Embodiment 2. FIG. FIG. 5 is a schematic structural view of a pair of magnetic poles described in Embodiment 3. FIG.

Detailed ways

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 1. The secondary of a cylindrical permanent magnet linear motor described in this embodiment is an axisymmetric structure, which includes a plurality of iron cores 4, an outer sleeve 6, an inner sleeve or a cylinder 8 and a plurality of The permanent magnet 5, the outer sleeve 6 and the inner sleeve or cylinder 8 are all made of non-magnetic material, the iron core 4 and the permanent magnet 5 are annular, and a plurality of iron cores 4 and a plurality of permanent magnets 5 All are fixed between the outer sleeve 6 and the inner sleeve or cylinder 8, and a plurality of iron cores 4 and a plurality of permanent magnets 5 are closely arranged in phases, and on the secondary radial section, every two adjacent permanent magnets form a positive V-shaped or inverted V-shaped, and the angle between two adjacent permanent magnets is B, the value range of the angle B is (0°, 180°), four consecutive adjacent permanent magnets form W The four permanent magnets adjacent to each other and the iron cores in the middle form a pair of magnetic poles, and the distance between the central axis of the inner sleeve or cylinder 8 and the magnetization direction of the four permanent magnets in each pair of magnetic poles The included angles are: A ₁ = B /2, A ₂ =180°- B /2, A ₃ =180°+ B /2, A ₄ =360°- B /2.

In the secondary of the cylindrical permanent magnet linear motor described in this embodiment, the magnetization directions of all permanent magnets form a certain angle with the axial direction of the motor, so that more permanent magnets can be placed in a certain volume .

When the secondary in this embodiment is located outside the primary, the inner sleeve or cylinder 8 is sleeve-shaped, and the primary is located in the sleeve-like shape of the inner sleeve or cylinder 8 .

When the secondary described in this embodiment is located inside the primary, the inner sleeve or cylinder 8 can be either sleeve-shaped or cylindrical.

In the secondary of the cylindrical permanent magnet linear motor described in this embodiment, an iron core is sandwiched between the two permanent magnets, so that the two permanent magnets gather magnetism to the iron core in the middle, thereby increasing the emission of the permanent magnets. The magnetic flux area and magnetic potential can achieve the technical effect of increasing the air gap magnetic flux density and increasing the thrust density of the motor.

Specific embodiment 2. This embodiment is a further description of the secondary side of a cylindrical permanent magnet linear motor described in specific embodiment 1. The permanent magnet 5 described in this embodiment is on the secondary radial section. The shape is a parallelogram, two mutually parallel sides of the parallelogram are in close contact with the inner wall of the outer sleeve 6 and the outer wall of the inner sleeve or cylinder 8 respectively, and the other two parallel sides of the parallelogram are in close contact with the The magnetization directions of the permanent magnets 5 are perpendicular to each other, and are closely matched with the adjacent iron cores 4 respectively.

The cross section of the permanent magnet in this embodiment is a parallelogram, so that the permanent magnet can fill the space formed by the iron core 4 , the outer sleeve 6 , the inner sleeve or the cylinder 8 .

The configuration of the secondary pair of magnetic poles according to this embodiment will be described with reference to FIG. 4 . Fig. 4 is the partially enlarged view of a pair of magnetic pole positions on the secondary axial section, the cross-sections of all permanent magnets 5 in the figure are parallelograms, and the two short sides in the parallelograms are respectively connected to the inner wall and the inner wall of the outer sleeve 6 The outer wall of the inner sleeve or cylinder 8 is in close contact, and the two long sides of the parallelogram are perpendicular to the magnetization direction of the permanent magnet 5, and are closely matched with the adjacent iron core 4 respectively, and the adjacent two The included angle B=60° between the permanent magnets 5-1 and 5-2, the two permanent magnets 5-1 and 5-2 form V-shaped magnetic poles, and the two permanent magnets 5-1 and 5-2 There is an iron core 4 between them, and four continuous adjacent permanent magnets 5-1, 5-2, 5-3 and 5-4 form a W shape to form a pair of magnetic poles, the width of the magnetic poles is T, and the inner sleeve or cylinder The included angle between the central axis of 8 and the magnetization direction of permanent magnet 5-1 is A1 = B /2=30°, and the _angle between the central axis of inner sleeve or cylinder 8 and the magnetization direction of permanent magnet 5-2 The included angle between them is A ₂ =180°- B /2=150°, the included angle between the central axis of the inner sleeve or cylinder 8 and the magnetization direction of the permanent magnet 5-3 is A ₃ =180°+ B /2=210°, the angle between the central axis of the inner sleeve or cylinder 8 and the magnetization direction of the permanent magnet 5-4 is A ₄ =360°- B /2=330°. The magnetization directions of the two permanent magnets 5-1 and 5-2 in one pole are opposite, and the magnetization directions of the two permanent magnets 5-3 and 5-4 in the other pole are opposite.

Specific embodiment three. This embodiment is a further description of the secondary side of a cylindrical permanent magnet linear motor described in specific embodiment one. The permanent magnet 5 described in this embodiment is on the secondary radial section. The shape is a rectangle, the two opposite corners of the rectangle are in close contact with the inner wall of the outer sleeve 6 and the outer wall of the inner sleeve or cylinder 8 respectively, and the other two opposite corners of the rectangle are in contact with the adjacent permanent magnet 5 Adjacent or in contact, the magnetization direction of the permanent magnet is perpendicular to the side of the rectangle, which is the side where the permanent magnet 5 and the iron core 4 are closely matched.

The cross-section of the permanent magnet 5 in the secondary described in this embodiment is rectangular, which uses less permanent magnets than the secondary structure described in Embodiment 2, and the processing technology is simpler.

A plurality of gaps are formed between the plurality of permanent magnets 5 in this embodiment and the inner wall of the outer sleeve 6 and the outer wall of the inner sleeve or cylinder 8, and the gaps 12 are formed along the secondary axial direction. With a certain magnetic isolation effect, the gap 12 can be filled with a non-magnetic material.

In the secondary described in this embodiment, the gap on the side adjacent to the primary becomes part of the actual air gap of the motor.

The configuration of the secondary pair of magnetic poles according to this embodiment will be described with reference to FIG. 5 . Fig. 5 is a partially enlarged view of a pair of secondary parts on the secondary axial section. The difference between this figure and the magnetic poles shown in Fig. 4 is that the cross-sections of all permanent magnets are rectangular, and every two adjacent permanent magnets are connected to the outer casing. A plurality of gaps 12 are formed between the inner wall of the barrel 6 and the outer wall of the inner sleeve or cylinder 8 .

Embodiment 4: This embodiment describes a cylindrical permanent magnet linear motor that adopts the secondary of Embodiment 1, 2 or 3. The motor includes a primary and a secondary, and the primary includes an end cover 1 , the primary iron core 3, the slotless armature winding 2 and the sliding bearing 7, the primary iron core 3 is cylindrical, the slotless armature winding 2 is fixed on the inner side wall of the primary iron core 3, and the secondary is located in the Inside the primary iron core 3, there is an air gap between the slotless armature winding 2 and the secondary outer sleeve 6, and the two end caps 1 are respectively the two ends of the primary, and the sleeve 6 passes through the sliding bearing 7 with primary sliding connection.

In the structure of the above-mentioned cylindrical linear motor, the outer sleeve 6 in the secondary plays a role as a linear motion guide rail of the linear motor.

Claims (4)

1. The secondary of a cylindrical permanent magnet linear motor, the secondary is an axisymmetric structure, characterized in that it consists of a plurality of iron cores (4), an outer sleeve (6), an inner sleeve or a cylinder ( 8) and a plurality of permanent magnets (5), the outer sleeve (6) and inner sleeve or cylinder (8) are made of non-magnetic materials, the iron core (4) and permanent magnets (5) are It is circular, and multiple iron cores (4) and multiple permanent magnets (5) are fixed between the outer sleeve (6) and the inner sleeve or cylinder (8), and the multiple iron cores (4) and multiple The permanent magnets (5) are closely arranged in phase, and on the secondary radial section, each two adjacent permanent magnets form a positive V shape or an inverted V shape, and the angle between two adjacent permanent magnets is B, The value range of the included angle B is (0°, 180°), four consecutive adjacent permanent magnets form a W shape, and the four consecutive adjacent permanent magnets and the iron core in the middle form a pair of magnetic poles , the included angles between the central axis of the inner sleeve or cylinder (8) and the magnetization direction of the four permanent magnets in each pair of magnetic poles are: A ₁ = B /2, A ₂ =180°- B / 2, A ₃ =180°+ B /2, A ₄ =360°- B /2. 2. The secondary of a cylindrical permanent magnet linear motor according to claim 1, characterized in that the shape of the permanent magnet (5) on the secondary radial section is a parallelogram, and the parallelogram The two parallel sides of the parallelogram are in close contact with the inner wall of the outer sleeve (6) and the outer wall of the inner sleeve or cylinder (8), respectively, and the other two parallel sides of the parallelogram are in close contact with the permanent magnet (5 ) are perpendicular to the magnetization direction, and are closely matched with adjacent iron cores (4). 3. The secondary of a cylindrical permanent magnet linear motor according to claim 1, characterized in that the shape of the permanent magnet (5) on the secondary radial section is a rectangle, and the opposite of the rectangle is Two corners are respectively in close contact with the inner wall of the outer sleeve (6) and the outer wall of the inner sleeve or cylinder (8), and the other two opposite corners of the rectangle are adjacent to or adjacent to the adjacent permanent magnet (5) Contact, the magnetization direction of the permanent magnet is perpendicular to the side of the rectangle, the side is the side where the permanent magnet (5) and the iron core (4) are closely matched, and the multiple permanent magnets (5) and the outer sleeve (6) A plurality of gaps are formed between the inner wall of the inner sleeve or the outer wall of the cylinder (8), and the gaps (12) are formed along the secondary axial direction. 4. The secondary side of a cylindrical permanent magnet linear motor according to claim 3, characterized in that the gap (12) is filled with a non-magnetic material.

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