CN116388508A - Low-positioning-force built-in hybrid excitation permanent magnet linear motor with magnetic focusing effect - Google Patents
Low-positioning-force built-in hybrid excitation permanent magnet linear motor with magnetic focusing effect Download PDFInfo
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- CN116388508A CN116388508A CN202310435169.9A CN202310435169A CN116388508A CN 116388508 A CN116388508 A CN 116388508A CN 202310435169 A CN202310435169 A CN 202310435169A CN 116388508 A CN116388508 A CN 116388508A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02K1/00—Details of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
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- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
- H02K41/033—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type with armature and magnets on one member, the other member being a flux distributor
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Abstract
The invention discloses a low-positioning-force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect, which comprises a double-side secondary stator and a primary rotor arranged between the stators. The secondary pole stator comprises a plurality of trapezoid stator teeth with dip angles, yoke parts are formed at the bottoms of the trapezoid stator teeth, the trapezoid teeth with dip angles are adopted in the shapes of the rotor teeth, each primary rotor comprises 6 primary rotor units, each primary rotor comprises two double-H magnetic conductive iron cores, a longitudinal permanent magnet is arranged in the middle of each primary rotor, two groups of excitation winding grooves are respectively formed in the upper end and the lower end of each primary rotor unit, two groups of armature winding mounting grooves are formed in the two ends of a bridge arm of each primary rotor unit, and a non-magnetic permeability magnetic barrier exists between each two rotor units. The linear motor not only reduces the manufacturing cost and the magnetic leakage phenomenon, but also greatly reduces the positioning force.
Description
Technical Field
The invention relates to the technical field of linear motors, in particular to a low-positioning-force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect.
Background
Linear motors are applied more and more frequently in the fields of rail transit, numerical control machine tools and the like, become hot spots in a plurality of industries at present gradually, the bilateral permanent magnet synchronous linear motor comprises a short primary consisting of permanent magnets and winding iron cores, and a long secondary stator consisting of magnetic permeability materials, and has a simple structure and higher reliability. Compared with a rotary motor, the linear motor has the advantages of simple structure, small noise and capability of greatly reducing longitudinal moment compared with a single-side linear motor, but the linear motor has the problems of large positioning force, high cost, serious magnetic leakage and the like, and limits the application range of the linear motor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a built-in hybrid excitation permanent magnet linear motor with low positioning force, low cost and less magnetic leakage.
In order to solve the technical problems, the invention adopts the following technical scheme: the low-positioning-force built-in hybrid excitation permanent magnet linear motor with the magnetism gathering effect comprises a double-sided secondary stator and a primary mover arranged between the double-sided secondary stators, wherein the primary mover comprises a plurality of double-H-shaped mover units, each double-H-shaped mover unit comprises two H-shaped magnetic conductive iron cores, built-in permanent magnets are arranged between the two H-shaped magnetic conductive iron cores, each of the double-H-shaped mover units on the upper side and the lower side of the built-in permanent magnet forms an excitation winding placing groove, two bridge arms are respectively formed on the upper side and the lower side of each H-shaped magnetic conductive iron core, an armature winding placing groove is formed between the bridge arms, armature winding coils are wound in the armature winding placing grooves, and excitation winding coils are arranged in the excitation winding placing grooves; the double-sided secondary stator comprises two secondary stator units which are arranged at intervals, each secondary stator unit comprises a secondary yoke, and secondary stator teeth are formed on the secondary yoke at intervals; the bridge arms are respectively provided with a primary rotor tooth; the lengths of the secondary stator teeth and the primary rotor teeth are equal, and a certain air gap interval is arranged between the bilateral secondary stator and the primary rotor; the double-sided secondary stator is fixed, and the primary sub-unit performs reciprocating linear motion between the fixed secondary stator units.
The further technical proposal is that: the rotor teeth comprise gradual change portions located at the lower side, the inner sides of the gradual change portions are vertical edges, the outer sides of the gradual change portions are arc edges, trapezoid portions are formed on the upper sides of the gradual change portions, the length of the bottoms of the trapezoid portions is smaller than that of the bottoms of the trapezoid portions, and rectangular portions are formed on the upper sides of the trapezoid portions.
The further technical proposal is that: pole pitch τ between stator teeth p =10mm, tooth spacing τ between mover teeth 1 Tooth pitch τ 1 With polar distance tau p The ratio beta is between 0.4 and 0.5, and the inclination angle of the waist edge in the trapezoid part in the rotor tooth and the height of the rotor tooth are determined by adopting the following formula:
wherein h is 1 L is the height of the trapezoid part in the rotor tooth 1 H is the overall length of the primary mover unit 2 Is the height of the rectangular part in the rotor tooth, b 1 Slot widths for two adjacent armature winding placement slots; b 2 A transverse width of a rectangular part b 3 The width of the bottoms of two adjacent armature winding placement grooves is Z, the total groove number of the armature winding placement grooves of the motor is Z, and alpha is the included angle between the waist edge of the trapezoid part in the rotor tooth and the horizontal direction.
The further technical proposal is that: selecting pole pitch τ between secondary stators of an electric machine p On the premise of 10mm, the size and structure of the trapezoidal stator teeth with the inclination angle are determined by adopting the following formula:
wherein h is 3 The height of the ladder-shaped stator teeth is that theta is an included angle between the waist edge of the ladder-shaped stator teeth and the vertical direction, and b 4 The width of the port between the stator teeth is the width of the stator teeth, and A is the area of the ladder-shaped stator teeth.
The further technical proposal is that: the double H structure of the primary rotor unit presents a structure which is symmetrical in the up-down and left-right directions, a connecting bridge arm of the rotor yoke and the rotor teeth adopts a function x=t, y=a×t×t, drawing and modeling are carried out, wherein t is a transition parameter, a is a coefficient, the value of t is 2.55, and the value of a is 0.181.
The further technical proposal is that: in each H-shaped rotor unit, a permanent magnet with a built-in rectangle is positioned between two H-shaped magnetic conductive iron cores, the magnetizing direction is along the X-axis direction, and the magnetizing directions of the permanent magnets in the adjacent H-shaped rotor units are opposite.
The further technical proposal is that: length L of the permanent magnet PM =20.3 cm, width W PM =1.9 mm; the two end corners of the rotor teeth, the two inner corners of the armature winding placement groove and the two inner corners of the groove between the stator teeth adopt chamfer structures, wherein the radius of the chamfer structures at the two ends of the rotor teeth is 0.6mm, and the radius of the chamfer structures at the two inner corners of the armature winding placement groove and the two inner corners of the groove between the stator teeth is 0.2mm.
The further technical proposal is that: six double H-shaped rotor units are arranged, direct current is introduced into exciting winding coils, the current flowing directions in six groups of exciting winding coils included in the first rotor unit, the third rotor unit and the fifth rotor unit are the same and inward, the directions of the current introduced into exciting winding coils in the second rotor unit, the fourth rotor unit and the sixth rotor unit are opposite and outward, the armature winding adopts a double-slot-distance setting principle, and one phase winding of the armature winding is placed in each rotor unit.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the linear motor adopts the double H-shaped magnetic conductive iron cores to form the primary rotor unit, so that the magnetic leakage problem of the primary rotor is effectively solved; the rotor teeth adopt a trapezoid structure with an inclined angle, have a certain magnetism gathering effect, reduce the magnetic saturation phenomenon of the rotor teeth, greatly reduce the positioning force during the operation of the motor, reduce the harmonic frequency of no-load back electromotive force, and the stator teeth adopt a trapezoid structure with an inclined angle, so that the air gap flux density waveform of the motor can be improved to a certain extent; the permanent magnet adopts an internal structure, so that the dosage of the permanent magnet is reduced (68.016 percent is reduced) to a great extent, and the manufacturing cost of the motor is saved; the two groups of exciting winding coils can be used alternately or simultaneously, the widths and the heights of the two groups of exciting winding coils are not mutually influenced, the two groups of exciting winding coils are convenient to use and maintain to a great extent, and the exciting winding placing grooves are arranged at the connecting positions of the two H-shaped magnetic conductive iron cores, so that the positioning force is effectively reduced; the rotor tooth end angle, the stator tooth end angle and the armature winding placement groove are all arc-shaped chamfer angles, so that the positioning force and fluctuation during the operation of the motor are reduced to a certain extent, and the overall magnetic leakage condition of the motor is reduced; the permanent magnet is arranged in the center of each rotor unit, so that the flux linkage structure is symmetrical, and further harmonic components of motor operation are effectively reduced.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic structural view of a linear motor according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a mover unit according to an embodiment of the present invention;
FIG. 3 is a schematic view of a trapezoidal tooth structure of a stator according to an embodiment of the present invention;
FIG. 4 is a schematic view of a trapezoidal tooth structure of the mover according to the embodiment of the present invention;
FIG. 5 is a schematic view of a magnetic flux density distribution in a linear motor according to an embodiment of the present invention;
FIG. 6 is a schematic diagram showing the distribution of magnetic induction lines in a subunit according to an embodiment of the present invention;
FIG. 7 is a graph showing a distribution of magnetic flux leakage in a single sub-unit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of the energizing direction of a dual excitation winding according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a back emf waveform in the prior art;
FIG. 10 is a schematic diagram of a prior art permanent magnet flux linkage waveform;
fig. 11 is a schematic diagram of a back electromotive force waveform of a linear motor according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a permanent magnet flux linkage waveform of a linear motor according to an embodiment of the present invention;
FIG. 13 is a schematic view of a linear motor positioning force waveform according to an embodiment of the present invention;
wherein: 1. a double sided secondary stator; 2. a primary mover; 3. a double H-shaped mover unit; 4. h-shaped magnetic conductive iron core; 5. a permanent magnet; 6. an excitation winding placement groove; 7. bridge arms; 8. an armature winding placement groove; 9. a secondary yoke; 10. secondary stator teeth; 11. primary mover teeth; 11-1, a gradual change part; 11-2, a trapezoid part; 11-3, rectangular parts; 12. an air gap spacing; 13. a non-magnetically permeable magnetic barrier.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1-2, the embodiment of the invention discloses a low-positioning-force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect, which comprises a double-sided secondary stator 1 and a primary mover 2 arranged between the double-sided secondary stators 1, wherein the primary mover comprises a plurality of double-H-shaped mover units 3, preferably, six double-H-shaped mover units 3 are arranged, namely a first mover unit, a second mover unit, a sixth mover unit and a non-magnetism-guiding magnetic barrier 13 are arranged between the double-H-shaped mover units 3; the double-sided secondary stator 1 is fixed, and the primary sub-unit performs reciprocating linear motion between the fixed secondary stator units.
Further, as shown in fig. 2, the double-H-shaped rotor unit 3 includes two H-shaped magnetic conductive iron cores 4, and an interior permanent magnet 5 is disposed between the two H-shaped magnetic conductive iron cores 4; the double H-shaped rotor units on the upper side and the lower side of the built-in permanent magnet 5 respectively form an excitation winding placing groove 6, the upper side and the lower side of each H-shaped magnetic conduction iron core 4 respectively form two bridge arms 7, an armature winding placing groove 8 is formed between the two bridge arms 7, armature winding coils are wound in the armature winding placing grooves 8, and excitation winding coils are arranged in the excitation winding placing grooves 6;
the double-sided secondary stator 1 comprises two secondary stator units which are arranged at intervals, the two secondary stator units have the same structure and are symmetrically arranged between the two secondary stator units; each secondary stator unit comprises a secondary yoke 9, a plurality of secondary stator teeth 10 are formed on the inner side of the secondary yoke 9 close to the primary rotor 2 at equal intervals, and the secondary stator teeth 10 are trapezoid teeth with inclined angles; the upper end or the lower end of each bridge arm 7 is respectively provided with a primary rotor tooth 11, and the primary rotor teeth 11 are trapezoid teeth with inclination angles; the length of the secondary stator teeth 10 is equal to that of the primary rotor teeth 11, and a certain air gap interval 12 is arranged between the bilateral secondary stator and the primary rotor 2, so that the two stators are not contacted when the primary rotor 2 moves between the bilateral secondary stators 1.
Primary toothDistance τ 1 From the secondary pole distance tau p Phase distance ρ and secondary pole distance τ p The following formula is satisfied:
where k, n is an integer, τ 1 Refers to the distance between the teeth of the two movers at the two sides of the armature winding placement groove and the distance between the teeth of the two movers at the two sides of the excitation winding groove, tau 3 Refers to the distance between two rotor teeth at the two ends of the magnetic barrier, ρ refers to the center distance of two rotor units, τ p Refers to the distance between each two of said stator teeth. The preferred parameter n= 6,k =2 in the linear motor.
Further, as shown in fig. 2, the primary mover teeth 11 include a gradual change portion 11-1 located at a lower side, an inner side of the gradual change portion 11-1 is a vertical side, an outer side of the gradual change portion 11-1 is an arc side, a trapezoid portion 11-2 is formed at an upper side of the gradual change portion 11-1, a length of a bottom of the trapezoid portion 11-2 is smaller than a length of an upper bottom of the trapezoid portion 11-2, a rectangular portion 11-3 is formed at an upper side of the trapezoid portion 11-2, and a length of the rectangular portion 11-3 is identical to a length of the upper bottom of the trapezoid portion 11-2.
Further, as shown in FIG. 3, the pole pitch τ between the secondary stator teeth 10 p On the premise of 10mm, the size structure of the trapezoidal stator teeth with the inclination angle is determined by adopting the following formula:
wherein h is 3 The height of the trapezoid stator teeth is that theta is the included angle between the waist edge of the trapezoid stator teeth and the vertical direction, b 4 The width of the port between the stator teeth is the width of the stator teeth, and A is the area of the ladder-shaped stator teeth.
Furthermore, as shown in fig. 4, the rotor teeth adopt trapezoid teeth with inclination angles, the structure can reduce magnetic circuit saturation, the structure has a certain magnetism gathering effect, the two end angles of the trapezoid rotor teeth adopt chamfer structures, the radian of the end angle is 90 degrees, the radius is 0.6mm through finite element parametric modeling analysis, under the premise that the polar distance of the secondary stator teeth is not changed, the thrust characteristic can be improved, the preferred rotor tooth width is 4.5mm when the ratio of the tooth width to the polar distance is 0.4-0.5, the modeling analysis is carried out on the rotor teeth, the parameters of the rotor teeth meet the following formula,
wherein h is 1 L is the height of the trapezoid part 11-2 in the rotor tooth 1 H is the whole length of the primary mover 2 2 Is the height of the rectangular part 11-3 in the rotor tooth, b 1 Slot widths for two adjacent armature winding placement slots 8; b 2 Is the transverse width of the rectangular part 11-3, b 3 The width of the bottoms of two adjacent armature winding placement grooves 8 is Z the total groove number of the armature winding placement grooves 8 of the motor, and alpha is the included angle between the waist edge of the trapezoid part 11-2 in the rotor tooth and the horizontal direction. Preferably, the first tooth height h of the mover tooth 2 =1.55 mm, the mover second tooth height was 2.8mm, and the final tilt angle was determined to be 53 °.
As shown in fig. 3, the secondary stator teeth adopt trapezoid teeth with inclination angles, the end angles of the secondary stator teeth adopt chamfering structures, finite element modeling simulation is performed on the inclination angles of the secondary stator teeth, it is found that the air gap waveforms can be improved by adopting the chamfering structures and the trapezoid stator teeth with inclination angles, in the design, the end angles of the stator are preferably 90 degrees in terms of end angle radian, the preferred radius is 0.2mm, and the size structure of the trapezoid stator teeth with inclination angles is determined by adopting the following formula:
wherein h is 3 The height of the trapezoid stator teeth is that theta is the included angle between the waist edge of the trapezoid stator teeth and the vertical direction, b 4 Is the stator tooth and the end between the stator teethPort width, a, is the area of the trapezoidal stator teeth.
As shown in fig. 3-4, the double H-shaped rotor unit 3 presents a structure with symmetry in the vertical and horizontal directions, and a function x=t and y=a×t×t are adopted at the connecting bridge arm of the rotor yoke and the trapezoidal rotor teeth, wherein the absolute values of the moving distances of x and y are respectively 2.55mm and 3mm, t is a transition parameter, a=0.18 and t=2.55, and drawing modeling is performed, so that the rotor teeth and the rotor yoke are connected more tightly. The upper and lower position junction of two H iron cores is slotted, places two sets of excitation windings, has reduced the magnetic leakage phenomenon to a certain extent, has reduced the locating force of motor operation in-process, and the rotor yoke is through comparing with armature winding groove and rotor integral height and permanent magnet for the magnetic line of force is very smooth at rotor yoke circulation, built-in permanent magnet place in the centre position of two H type magnetic conduction iron cores 4, the permanent magnet is arranged in two H iron cores in, the direction of magnetizing is along X axis direction, the direction of magnetizing of permanent magnet in the adjacent two H iron cores is opposite, the direction of magnetizing of permanent magnet in the first rotor unit is-X direction. The structure of up-down bilateral symmetry of the double H-shaped iron cores is satisfied. The end angles at two ends of the armature winding groove adopt arc chamfers, preferably 0.2mm, so that magnetic force lines circulate more smoothly. The double H-shaped iron core adopts a slotting design to carry out parameterization modeling analysis on the specific size of a slotting, the design prefers a radius of 3mm, and finite element simulation discovers that magnetic force lines do not pass through the part, so that the trend of the magnetic force lines is not influenced. Through finite element simulation, the round slot can reduce thrust fluctuation and positioning force.
Further, in each double-H-shaped rotor unit 3, a permanent magnet 5 with a built-in rectangle is positioned between two H-shaped magnetic conductive iron cores 4, the magnetizing direction is along the X axis direction, and the magnetizing directions of the permanent magnets in the adjacent double-H-shaped rotor units 3 are opposite. Length L of the permanent magnet 5 PM =20.3 cm, width W PM =1.9 mm; the two end corners of the rotor teeth, the two inner corners of the armature winding placement groove 8 and the two inner corners of the groove between the stator teeth adopt chamfer structures, wherein the radius of the chamfer structures at the two ends of the rotor teeth is 0.6mm, and the radius of the chamfer structures at the two inner corners of the armature winding placement groove 8 and the two inner corners of the groove between the stator teeth is 0.2mm. Two groups of excitation windings in double H-shaped rotor unit 3Alternatively or simultaneously, both widths and heights are the same, the slot width W of the excitation winding placement slot 6 lici ＝6.9mm。
In addition, six double-H-shaped rotor units 3 are arranged, direct current is introduced into exciting winding coils, the current flowing directions in six groups of exciting winding coils included in the first rotor unit, the third rotor unit and the fifth rotor unit are the same and inward, the directions of the current introduced into exciting winding coils in the second rotor unit, the fourth rotor unit and the sixth rotor unit are opposite and outward, the armature winding adopts a double-slot-distance setting principle, and one phase winding of the armature winding is placed in each rotor unit.
As shown in fig. 5-8, the magnetic force lines can be seen to smoothly circulate in each sub-unit, and the function is used for drawing bridge arms, so that the two double-H iron cores are tightly connected, the magnetic flux leakage phenomenon is reduced, the magnetic saturation phenomenon is less by adopting a design of a plurality of chamfers, the excitation winding is positioned at symmetrical positions at two ends of each sub-unit, and the distribution condition of the direct current is particularly shown in fig. 8.
The permanent magnet is arranged in each unit, the width is only 1.9mm, and compared with the existing motor, the permanent magnet saves the material as a whole by 68.016 percent, so that the manufacturing cost of the whole motor is greatly reduced. The waveform of the permanent magnet flux linkage is more symmetrical, and the back electromotive force waveform is more similar to a sine wave.
Fig. 9 is a schematic diagram of a back emf waveform in the prior art; FIG. 10 is a schematic diagram of a prior art permanent magnet flux linkage waveform; fig. 11 is a schematic diagram of a back electromotive force waveform of a linear motor according to an embodiment of the present invention; fig. 12 is a schematic diagram of a permanent magnet flux linkage waveform of a linear motor according to an embodiment of the present invention; with the adoption of the magnetic flux switching linear motor technology as shown in fig. 13, compared with the existing magnetic flux switching linear motor technology, the positioning force of the linear motor is very small, the amplitude of the whole positioning force is below 10N, and the positioning force is far lower than that of the existing linear motor.
Finally, it should be explained that: the above embodiments are only typical embodiments of the invention and should not be used to limit the scope of the invention. Equivalent substitutions and modifications will occur to those skilled in the art, and these should be considered to fall within the scope of the present invention.
Claims (10)
1. A low-positioning-force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect is characterized in that: the double-H-shaped magnetic induction motor comprises a double-side secondary stator (1) and a primary rotor (2) arranged between the double-side secondary stators (1), wherein the primary rotor comprises a plurality of double-H-shaped rotor units (3), each double-H-shaped rotor unit (3) comprises two H-shaped magnetic induction iron cores (4), an interior permanent magnet (5) is arranged between the two H-shaped magnetic induction iron cores (4), each double-H-shaped rotor unit at the upper side and the lower side of the interior permanent magnet (5) forms an excitation winding placing groove (6), two bridge arms (7) are respectively formed at the upper side and the lower side of each H-shaped magnetic induction iron core (4), an armature winding placing groove (8) is formed between the bridge arms (7), an armature winding coil is wound in each armature winding placing groove (8), and an excitation winding coil is arranged in each excitation winding placing groove (6); the double-sided secondary stator (1) comprises two secondary stator units which are arranged at intervals, each secondary stator unit comprises a secondary yoke (9), and secondary stator teeth (10) are formed on the secondary yoke (9) at intervals; primary rotor teeth (11) are respectively formed on the bridge arms (7); the lengths of the secondary stator teeth (10) and the primary rotor teeth (11) are equal, and a certain air gap interval (12) is arranged between the bilateral secondary stator and the primary rotor (2); the double-sided secondary stator (1) is fixed, and the primary sub-units perform reciprocating linear motion between the fixed secondary stator units.
2. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect as set forth in claim 1, wherein: the primary rotor teeth (11) and the secondary stator teeth (10) adopt trapezoid teeth with inclination angles.
3. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect as set forth in claim 1, wherein: the primary rotor tooth (11) comprises a gradual change portion (11-1) located at the lower side, the inner side of the gradual change portion (11-1) is a vertical side, the outer side of the gradual change portion (11-1) is an arc side, a trapezoid portion (11-2) is formed at the upper side of the gradual change portion (11-1), the length of the lower bottom of the trapezoid portion (11-2) is smaller than that of the upper bottom of the trapezoid portion (11-2), a rectangular portion (11-3) is formed at the upper side of the trapezoid portion (11-2), and the length of the rectangular portion (11-3) is identical to that of the upper bottom of the trapezoid portion (11-2).
4. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism collecting effect according to claim 3, wherein: the secondary stator teeth (10) and the pole pitch tau between the secondary stator teeth (10) p =10mm, tooth pitch τ between primary mover teeth (11) and primary mover teeth (11) 1 Tooth pitch τ 1 With polar distance tau p The ratio beta is between 0.4 and 0.5, and the inclination angle of the waist edge in the trapezoid part (11-2) in the rotor tooth and the height of the rotor tooth are determined by adopting the following formula:
wherein h is 1 Is the height of the trapezoid part (11-2) in the rotor tooth, L 1 Is the whole length of the primary mover (2), h 2 Is the height of the rectangular part (11-3) in the rotor tooth, b 1 Slot widths for two adjacent armature winding placement slots (8); b 2 Is the transverse width of the rectangular part (11-3), b 3 The width of the bottoms of two adjacent armature winding placement grooves (8) is Z, the total groove number of the armature winding placement grooves (8) of the motor is Z, and alpha is the included angle between the waist edge of the trapezoid part (11-2) in the rotor tooth and the horizontal direction.
5. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect according to claim 2, wherein: in the secondary stator teeth(10) Polar distance τ between p On the premise of 10mm, the size structure of the trapezoidal stator teeth with the inclination angle is determined by adopting the following formula:
wherein h is 3 The height of the trapezoid stator teeth is that theta is the included angle between the waist edge of the trapezoid stator teeth and the vertical direction, b 4 The width of the port between the stator teeth is the width of the stator teeth, and A is the area of the ladder-shaped stator teeth.
6. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect as set forth in claim 1, wherein: the double H-shaped rotor unit (3) presents a structure which is symmetrical in the up-down and left-right directions, a connecting bridge arm of a rotor yoke and rotor teeth adopts a function x=t, y=a×t×t to carry out drawing modeling, wherein t is a transition parameter, a is a coefficient, the value of t is 2.55, and the value of a is 0.181.
7. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect according to claim 1, wherein: in each double H-shaped rotor unit (3), a permanent magnet (5) with a built-in rectangle is positioned between two H-shaped magnetic conductive iron cores (4), the magnetizing direction is along the X-axis direction, and the magnetizing directions of the permanent magnets in the adjacent double H-shaped rotor units (3) are opposite.
8. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect according to claim 7, wherein: the length L of the permanent magnet (5) PM =20.3 cm, width W PM =1.9 mm; the two end corners of the rotor teeth, the two inner corners of the armature winding placement groove (8) and the two inner corners of the groove between the stator teeth adopt chamfer structures, wherein the radius of the chamfer structures at the two ends of the rotor teeth is 0.6mm, and the radius of the two inner corner structures of the armature winding placement groove (8) and the two inner corners of the groove between the stator teeth is 0.2mm.
9. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect according to claim 1, wherein: two groups of exciting windings in the double H-shaped rotor unit (3) are alternately used or used simultaneously, the width and the height of the exciting windings are the same, and the width W of the exciting winding placing groove (6) is the width W of the exciting winding placing groove lici ＝6.9mm。
10. The low positioning force built-in hybrid excitation permanent magnet linear motor with a magnetism gathering effect according to claim 1, wherein: six double H-shaped rotor units (3) are provided, direct current is introduced into exciting winding coils, the directions of current in six groups of exciting winding coils included in the first rotor unit, the third rotor unit and the fifth rotor unit are the same and inwards, the directions of current introduced into exciting winding coils in the second rotor unit, the fourth rotor unit and the sixth rotor unit are opposite and outwards, the armature windings adopt a double-slot-distance setting principle, and one phase winding of the armature windings is placed in each rotor unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310435169.9A CN116388508A (en) | 2023-04-21 | 2023-04-21 | Low-positioning-force built-in hybrid excitation permanent magnet linear motor with magnetic focusing effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310435169.9A CN116388508A (en) | 2023-04-21 | 2023-04-21 | Low-positioning-force built-in hybrid excitation permanent magnet linear motor with magnetic focusing effect |
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| Publication Number | Publication Date |
|---|---|
| CN116388508A true CN116388508A (en) | 2023-07-04 |
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|---|---|---|---|
| CN202310435169.9A Pending CN116388508A (en) | 2023-04-21 | 2023-04-21 | Low-positioning-force built-in hybrid excitation permanent magnet linear motor with magnetic focusing effect |
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| Country | Link |
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| CN (1) | CN116388508A (en) |
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- 2023-04-21 CN CN202310435169.9A patent/CN116388508A/en active Pending
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