An Unequal-Height Halbach Composite-Excitation Linear Motor

Abstract

The present invention discloses a Halbach composite-excitation linear motor with unequal heights, comprising: a motor primary and a motor secondary; the motor primary includes an armature iron core, a first slider, a second slider, a third slider, a fourth slider and a primary mounting plate; the primary mounting plate is provided with the first slider, the second slider, the third slider and the fourth slider; the motor secondary includes a Halbach permanent magnet array, a DC excitation iron core, a first guide rail, a second guide rail and a secondary mounting plate; the secondary mounting plate is provided with the first guide rail and the second guide rail, and two sliders are arranged on each guide rail and are in sliding fit in a cylindrical surface form. Through the adaptation of the sliders and the guide rails, the motor primary and the secondary perform stable relative motion and can carry large loads. The Halbach composite-excitation linear motor with unequal heights provided by the present invention has the advantages of simple and compact structure, safety and reliability, environmental protection and high efficiency, etc., can save the usage amount of permanent magnets, and the working air-gap magnetic flux can be adjusted bidirectionally, and has a high load-carrying capacity and a wide speed regulation range.

Description

Technical Field

[0001] The present invention relates to the technical field of linear motors, and in particular to an unequal-height Halbach composite-excitation linear motor. Background Art

[0002] Currently, widely relied-on traditional energy sources such as oil and coal are limited and non-renewable, and are also accompanied by other problems such as environmental pollution. Therefore, countries around the world will regard renewable new energy sources such as wind energy and wave energy as important options for research and development and exploitation. China has a long coastline and rich marine resources. In particular, the energy density of wave energy is very high, and wave energy power generation technology has received increasing attention, especially the direct-drive motor technology in direct-drive wave conversion. The direct-drive motor can reduce the energy loss in the intermediate links and improve the power generation efficiency. Most ordinary direct-drive wave energy power generation uses pure permanent magnets such as neodymium iron boron as magnetic poles. The amount of permanent magnets used for large generators is very large, the magnetic field size is fixed, and the regulation of the working air-gap magnetic flux is limited. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an unequal-height Halbach composite-excitation linear motor, which has the characteristics of simple structure, safety and reliability, environmental protection and high efficiency, can save the use amount of permanent magnets, and the working air-gap magnetic flux can be adjusted bidirectionally to improve the load-carrying capacity.

[0004] To solve the above technical problem, the present invention provides an unequal-height Halbach composite-excitation linear motor, including: a motor primary and a motor secondary; the motor primary includes an armature core 7, a first slider 1, a second slider 2, a third slider 11, a fourth slider 13 and a primary mounting plate 12; the first slider 1, the second slider 2, the third slider 11 and the fourth slider 13 are mounted on the primary mounting plate 12; the motor secondary includes a Halbach permanent magnet array 8, a DC excitation iron core 6, a first guide rail 3, a second guide rail 10 and a secondary mounting plate 4; the first guide rail 3 and the second guide rail 10 are mounted on the secondary mounting plate 4, and two sliders are provided on each guide rail and are in sliding fit in the form of a cylindrical surface. Through the adaptation of the sliders and the guide rails, the motor primary and the secondary can perform a stable relative movement and can carry large loads;

[0005] The Halbach permanent magnet array 8 and the DC excitation iron core 6 share the same armature core 7. The Halbach permanent magnet array 8 is placed on the upper surface of the secondary mounting plate 4, and the side with weakened magnetic field is fixed to the secondary mounting plate 4, and the side with enhanced magnetic field faces the motor primary. The DC excitation iron core 6 is placed on the upper surface of the secondary mounting plate 4, is placed side by side with the Halbach permanent magnet array 8 and has a gap, and the side of its claw pole faces the motor primary, and the back of its claw pole is fixed to the secondary mounting plate 4.

[0006] Preferably, anti - detachment end caps are provided at both ends of each guide rail.

[0007] Preferably, the Halbach permanent magnet array 8 adopts a Halbach permanent magnet array with unequal heights of the main magnetic poles and the auxiliary magnetic poles, and the height of the permanent magnet main magnetic pole is higher than that of the auxiliary magnetic pole, reducing the usage amount of permanent magnets.

[0008] Preferably, the arrangement order of the claw poles of the DC excitation iron core 6 within the pole pitch of a Halbach permanent magnet array is positive claw pole 6 - 1, auxiliary claw pole, negative claw pole 6 - 2 and auxiliary claw pole, or negative claw pole 6 - 2, auxiliary claw pole, positive claw pole 6 - 1 and auxiliary claw pole. The widths of the positive and negative claw poles are equal to the width of the permanent magnet main magnetic pole, and the width of the auxiliary claw pole is equal to the width of the permanent magnet auxiliary magnetic pole. The positive and negative claw poles and the auxiliary claw poles are longitudinally aligned with the permanent magnet main magnetic pole and the auxiliary magnetic pole respectively.

[0009] Preferably, when the DC excitation iron core 6 passes a positive current, the air - gap magnetic flux is enhanced when the installation order of the claw poles is positive claw pole, auxiliary claw pole, negative claw pole and auxiliary claw pole, and the air - gap magnetic flux is weakened when the installation order of the claw poles is negative claw pole, auxiliary claw pole, positive claw pole and auxiliary claw pole; when the DC excitation iron core 6 passes a negative current, the air - gap magnetic flux is weakened when the installation order of the claw poles is positive claw pole, auxiliary claw pole, negative claw pole and auxiliary claw pole, and the air - gap magnetic flux is enhanced when the installation order of the claw poles is negative claw pole, auxiliary claw pole, positive claw pole and auxiliary claw pole.

[0010] Preferably, the heights of the positive and negative claw poles of the DC excitation iron core 6 are equal to the height of the main magnetic pole of the Halbach permanent magnet array, and the height of the auxiliary claw pole has nothing to do with the height of the auxiliary magnetic pole of the Halbach permanent magnet array, but is related to the magnetic isolation distance between the positive claw pole and the negative claw pole.

[0011] Preferably, when the height of the DC excitation iron core 6 is fixed, its longitudinal length is related to the number of turns of the DC excitation coil to be configured.

[0012] Preferably, the Halbach permanent magnet array 8 and the DC excitation iron core 6 are in parallel excitation, and the distance between the permanent magnet array and the DC excitation iron core is related to their magnetic isolation distance.

[0013] Preferably, the gap distance between the primary iron core of the motor and the secondary excitation pole face of the motor is adjustable.

[0014] The beneficial effects of the present invention are as follows: The unequal - height Halbach composite - excitation linear motor provided by the present invention has the advantages of simple and compact structure, safety and reliability, environmental protection and high efficiency, etc. It can save the usage amount of permanent magnets, and the working air - gap magnetic flux can be adjusted bidirectionally, with high load - bearing capacity and wide speed - regulation range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present invention.

[0016] Figure 2 This is a schematic structural diagram of the positive claw pole of the present invention.

[0017] Figure 3 This is a schematic structural diagram of the negative claw pole of the present invention.

[0018] Figure 4 This is a schematic structural diagram of the auxiliary claw pole of the present invention.

[0019] Figure 5 This is a schematic structural diagram of the Halbach permanent magnet array within four pole pitches of the present invention.

[0020] Among them, 1. The first slider; 2. The second slider; 3. The first guide rail; 4. The secondary mounting plate; 5. The first primary iron core support adjusting angle block; 6. The DC exciting iron core; 7. The armature iron core; 8. The Halbach permanent magnet array; 9. The second primary iron core support adjusting angle block; 10. The second guide rail; 11. The third slider; 12. The primary mounting plate; 13. The fourth slider; 6-1. The positive claw pole; 6-2. The negative claw pole; 6-3. The auxiliary claw pole; 8-1. The main magnetic pole; 8-2. The auxiliary magnetic pole. Specific embodiments

[0021] As Figure 1 shown, a Halbach composite excitation linear motor with unequal heights includes: a motor primary and a motor secondary; the motor primary includes an armature iron core 7, a first slider 1, a second slider 2, a third slider 11, a fourth slider 13, and a primary mounting plate 12; the primary mounting plate 12 is installed with the first slider 1, the second slider 2, the third slider 11, and the fourth slider 13; the motor secondary includes a Halbach permanent magnet array 8, a DC exciting iron core 6, a first guide rail 3, a second guide rail 10, and a secondary mounting plate 4; the secondary mounting plate 4 is installed with the first guide rail 3 and the second guide rail 10, and each guide rail is provided with two sliders that are fitted in a cylindrical surface sliding form. By adapting the sliders to the guide rails, the motor primary and the secondary can perform stable relative movement and can carry large loads; the Halbach permanent magnet array 8 and the DC exciting iron core 6 share the same armature iron core 7. The Halbach permanent magnet array 8 is placed on the upper surface of the secondary mounting plate 4, and the side with weakened magnetic field is fixed to the secondary mounting plate 4, and the side with enhanced magnetic field faces the motor primary. The DC exciting iron core 6 is placed on the upper surface of the secondary mounting plate 4, and is placed side by side with the Halbach permanent magnet array 8 with a gap. One side of its claw pole faces the motor primary, and the back of its claw pole is fixed to the secondary mounting plate 4.

[0022] The first guide rail 3 cooperates with the first slider 1 and the second slider 2, and the second guide rail 10 cooperates with the third slider 11 and the fourth slider 13. Whether anti-disengagement end caps are provided at both ends of the guide rail is determined by the actual application of the motor. The purpose of matching one guide rail with two sliders is to enable the primary of the motor to move smoothly, and the working air gap during movement remains unchanged during non-field regulation.

[0023] As Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, the Halbach permanent magnet array 8 fixed on the secondary mounting plate 4 includes a main magnetic pole 8-1 and an auxiliary magnetic pole 8-2, which are not equal in the height direction, and the height of the main magnetic pole 8-1 is higher than that of the auxiliary magnetic pole 8-2. During installation, the positive claw pole 6-1 is aligned with the N pole of the main magnetic pole 8-1 of the permanent magnet, the negative claw pole 6-2 is aligned with the S pole of the main magnetic pole 8-1 of the permanent magnet, and the auxiliary claw pole 6-3 is aligned with the auxiliary magnetic pole 8-2. The maximum height of the DC excitation iron core 6 is consistent with the height of the main magnetic pole of the permanent magnet, otherwise the working air gap magnetic field is inconsistent during the operation of the motor during non-field regulation.

[0024] The armature iron core 7 is installed and fixed by adjusting the first primary iron core support adjusting angle block 5 and the second primary iron core support adjusting angle block 9. At the same time, it can be installed on the primary mounting plate 12 through the mounting holes of the first primary iron core support adjusting angle block 5 and the second primary iron core support adjusting angle block 9. During installation, the installation of the slidable bolt and the adjustable screw needs to be coordinated to achieve the purpose of adjusting the air gap spacing, and the size of the air gap can be determined according to the actual operating environment conditions.

[0025] The Halbach permanent magnet array 8 is made of neodymium iron boron, and the armature iron core 7 and the DC excitation iron core 6 are made of silicon steel sheet punched laminations.

[0026] During the working process of wave energy power generation of the present invention, the secondary of the motor is fixedly connected to the floating body, and the primary of the motor is fixedly connected to another floating body. The two floating bodies move relatively with the waves, driving the primary and the primary of the motor to move relatively. Through appropriate control, an electromotive force is induced in the primary of the motor.

[0027] The motor of the present invention can operate in pure electric, pure power generation or power generation-electric combination operation. By applying the principle of the present invention and making appropriate modifications or equivalent replacements, a circular rotating motor can be made. The motor of the present invention is not only applied to wave energy power generation, but also can be applied to occasions such as wind power generation and electric vehicles.

Claims

1. An unequal-height Halbach composite-excitation linear motor, characterized in that, Comprising: A motor primary and a motor secondary; the motor primary includes an armature core (7), a first slider (1), a second slider (2), a third slider (11), a fourth slider (13), and a primary mounting plate (12); the primary mounting plate (12) mounts the first slider (1), the second slider (2), the third slider (11), and the fourth slider (13); the motor secondary includes a Halbach permanent magnet array (8), a DC excitation iron core (6), a first guide rail (3), a second guide rail (10), and a secondary mounting plate (4); the secondary mounting plate (4) mounts the first guide rail (3) and the second guide rail (10), and each guide rail is provided with two sliders that are in sliding fit in the form of a cylindrical surface. By adapting the sliders to the guide rails, the motor primary and the secondary can perform stable relative motion and can carry large loads. The Halbach permanent magnet array (8) and the DC excitation iron core (6) share the same armature core (7). The Halbach permanent magnet array (8) is placed on the upper surface of the secondary mounting plate (4), and the side with weakened magnetic field is fixed to the secondary mounting plate (4), and the side with enhanced magnetic field faces the motor primary. The DC excitation iron core (6) is placed on the upper surface of the secondary mounting plate (4), is placed side by side with the Halbach permanent magnet array (8) with a gap, and the side of its claw pole faces the motor primary, and the back of its claw pole is fixed to the secondary mounting plate (4). The arrangement order of the claw poles of the DC excitation iron core (6) within the pole pitch of a Halbach permanent magnet array is a positive claw pole (6-1), an auxiliary claw pole, a negative claw pole (6-2), and an auxiliary claw pole, or a negative claw pole (6-2), an auxiliary claw pole, a positive claw pole (6-1), and an auxiliary claw pole. The widths of the positive and negative claw poles are equal to the width of the permanent magnet main pole, and the width of the auxiliary claw pole is equal to the width of the permanent magnet auxiliary pole. The positive and negative claw poles and the auxiliary claw poles are longitudinally aligned with the main pole and the auxiliary pole of the permanent magnet respectively. When the DC excitation iron core (6) conducts positive current, the air-gap magnetic flux increases when the installation order of the claw poles is a positive claw pole, an auxiliary claw pole, a negative claw pole, and an auxiliary claw pole, and the air-gap magnetic flux decreases when the installation order of the claw poles is a negative claw pole, an auxiliary claw pole, a positive claw pole, and an auxiliary claw pole. When the DC excitation iron core (6) conducts negative current, the air-gap magnetic flux decreases when the installation order of the claw poles is a positive claw pole, an auxiliary claw pole, a negative claw pole, and an auxiliary claw pole, and the air-gap magnetic flux increases when the installation order of the claw poles is a negative claw pole, an auxiliary claw pole, a positive claw pole, and an auxiliary claw pole.

2. The unequal-height Halbach composite-excitation linear motor according to claim 1, wherein Anti-disengagement end caps are provided at both ends of each guide rail.

3. The unequal-height Halbach composite-excitation linear motor according to claim 1, wherein, The Halbach permanent magnet array (8) adopts a Halbach permanent magnet array with unequal heights of the main pole and the auxiliary pole, and the height of the permanent magnet main pole is higher than the height of the auxiliary pole.

4. The unequal-height Halbach composite-excitation linear motor according to claim 1, wherein The heights of the positive and negative claw poles of the DC excitation iron core (6) are equal to the height of the main pole of the Halbach permanent magnet array, and the height of the auxiliary claw pole has nothing to do with the height of the auxiliary pole of the Halbach permanent magnet array and is related to the magnetic isolation distance between the positive and negative claw poles.

5. The unequal-height Halbach composite-excitation linear motor according to claim 1, wherein When the height of the DC excitation iron core (6) is fixed, its longitudinal length is related to the number of turns of the DC excitation coil to be configured.

6. The unequal-height Halbach composite-excitation linear motor according to claim 1, characterized in that The Halbach permanent magnet array (8) and the DC excited iron core (6) are in parallel excitation, and the distance between the permanent magnet array and the DC excited iron core is related to the magnetic isolation distance between the two.

7. The unequal-height Halbach composite-excitation linear motor according to claim 1, wherein The gap distance between the primary iron core of the motor and the secondary excitation pole face of the motor is adjustable.

Images