CN113178999B - Stator permanent magnet type linear oscillating motor - Google Patents
Stator permanent magnet type linear oscillating motor Download PDFInfo
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- CN113178999B CN113178999B CN202110468104.5A CN202110468104A CN113178999B CN 113178999 B CN113178999 B CN 113178999B CN 202110468104 A CN202110468104 A CN 202110468104A CN 113178999 B CN113178999 B CN 113178999B
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- 238000004804 winding Methods 0.000 claims abstract description 74
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 73
- 230000004907 flux Effects 0.000 claims description 16
- 239000004020 conductor Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 abstract description 11
- 230000002427 irreversible effect Effects 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 230000005347 demagnetization Effects 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 11
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 230000002146 bilateral effect Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000976 Electrical steel Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Linear Motors (AREA)
Abstract
The invention discloses a stator permanent magnet linear oscillating motor, wherein a stator winding iron core adopts an integrally designed salient pole structure, so that the processing difficulty can be reduced, and the reliability of the structure can be improved; the permanent magnet of the linear oscillating motor is embedded in the stator core, and the stator permanent magnet type structure can effectively avoid irreversible damage of the permanent magnet with low mechanical strength caused by mechanical stress, is more beneficial to heat dissipation of the permanent magnet, avoids irreversible demagnetization of the permanent magnet caused by temperature rise, improves safety and reliability and prolongs service life; in addition, as the permanent magnet is not used as a moving structure and is embedded in the stator core, the permanent magnet sheath can be prevented from being arranged, the mechanical air gap of the motor is reduced, the coupling between the stator and the rotor is enhanced, and the utilization rate of the permanent magnet material is improved. The motor adopts a direct drive structure, replaces a complex crank-connecting rod mechanism in the prior art to generate linear reciprocating motion, and has more compact structure. In addition, the motor permanent magnet provided by the invention has the advantages of less consumption and low cost.
Description
Technical Field
The invention belongs to the field of linear oscillating motors, and particularly relates to a stator permanent magnet type linear oscillating motor.
Background
The linear oscillating motor is used as a single-phase permanent magnet linear motor, realizes linear reciprocating motion by means of the action of an external spring and alternating current excitation, greatly improves the working efficiency compared with a reciprocating piston compressor driven by a traditional rotating motor, and is widely applied to a plurality of fields needing reciprocating linear driving.
The development of the linear oscillating motor is closely related to the rise of rare earth permanent magnet materials, and the gradual perfection of the research on the performance of the rare earth permanent magnet materials reduces the material cost, so that the development of the permanent magnet linear motor is promoted. However, compared with motor materials such as copper, non-magnetic alloy materials, silicon steel and the like, the rare earth permanent magnet materials are still very expensive, and even can occupy about 90% in the manufacturing cost of the permanent magnet motor, so that the industrial popularization of the permanent magnet linear oscillating motor is limited to a certain extent.
Linear oscillating motor products of international enterprises such as LG and the like belong to moving magnet type or moving magnet type linear motors, the primary side of the motor is set to be a stator, and compared with a moving coil type linear motor, the linear oscillating motor products avoid the participation of coils in linear motion, thereby preventing the problems of short circuit and open circuit caused by motion and improving the safety of the motor. But the limitation lies in that the moving magnet type or moving magnet type linear oscillating motor takes the permanent magnet material as a moving part, and a plurality of surfaces are adhered to a rotor iron core or a permanent magnet sheath to form a series magnetic circuit. On the other hand, the mechanical strength of the permanent magnet material is generally not high, which makes the permanent magnet of this type of motor as a moving part generate relative micro-motion under the inertial action of high-speed reciprocating motion, and the permanent magnet is damaged. In addition, in order to avoid the irreversible damage of the permanent magnet materials caused by impurities, sweeping bores and other factors in the motor, a sheath is usually added or an air gap between the primary and the secondary is enlarged, but the coupling capability between the primary and the secondary is reduced due to an excessive mechanical air gap, so that the utilization rate of the permanent magnet materials is reduced.
Therefore, how to improve the magnetic utilization rate of the motor and the service life of the permanent magnet without increasing the manufacturing cost and the construction difficulty of the motor is a problem to be solved in the current industry.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a stator permanent magnet type linear oscillating motor, thereby solving the technical problems of high manufacturing cost, low service life of a permanent magnet and low magnetic utilization rate of the motor.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a stator permanent magnet linear oscillating motor comprising a stator assembly and a mover assembly;
The stator assembly comprises a stator winding iron core, an armature winding, a stator permanent magnet iron core and a permanent magnet;
The stator winding iron core comprises 2N+1 equal-height equal-width stator teeth uniformly distributed on the yoke part and a stator yoke thereof, wherein N is the number of single-phase winding coils of the stator winding iron core; wherein, the middle teeth and the armature winding form a motor armature together; the plane structure of the stator permanent magnet iron core is concave, and the permanent magnet is embedded in the groove of the stator permanent magnet iron core; the stator winding iron core and the stator permanent magnet iron core are equal in length and are placed in an up-down alignment mode;
the rotor assembly comprises a rotor bracket and a segmented rotor core; the partitioned rotor iron core comprises 3N+1 iron core blocks with the same shape, wherein each iron core block is fixed on the rotor support at equal intervals and does reciprocating linear motion along the axis direction of the rotor support.
Preferably, the coils of the armature winding are all supplied with sinusoidal alternating current at the same frequency as the mover assembly reciprocates to produce a bipolar armature flux linkage.
Preferably, the cross section of the rotor core block is isosceles trapezoid, and the side width W ru of the adjacent stator winding core, the side width W rd of the adjacent stator permanent magnet core and the center line spacing W ri between the rotor core blocks and the tooth width W sc of the stator teeth respectively meet the following relations:
Wru＝1.7Wsc；
Wrd＝Wsc；
wherein W si is the stator tooth spacing.
Preferably, the length L r of the mover support and the side width W ru of the adjacent stator winding core and the center line spacing W ri between the mover core blocks satisfy the following relationship:
Lr＝Wru+3NWri。
according to a second aspect of the present invention, there is provided a multi-unit combined stator permanent magnet type linear oscillating motor, comprising the stator permanent magnet type linear oscillating motor according to the first aspect, wherein the rotor support is cylindrical, and a plurality of stator permanent magnet type linear oscillating motors with the same structure are rotationally symmetrically mounted on the rotor support.
Preferably, the mover support is in a hollow structure.
Preferably, the outer circle diameter d ro of the mover support and the tooth height H si of the stator teeth satisfy the following relationship:
dro＝Hsi+Hf+2Hgap+Hs+Hr；
Wherein, H f is the height of a stator yoke, H gap is the air gap of the motor, H s is the height of a stator permanent magnet core, and H r is the height of a rotor core block.
Preferably, the mover assembly further comprises moving shafts which are coaxial with the mover support and are respectively fixed at two ends of the mover support, and the moving shafts are sleeved with resonant springs with equal length.
Preferably, the device also comprises a linear motion bearing, an end cover and a shell; the linear motion bearing is positioned at the geometric center of the end cover, and the motion shaft is sleeved on the linear motion bearing; the stator winding iron cores and the stator permanent magnet iron cores of the plurality of stator permanent magnet linear oscillating motors are mutually matched with the fixed slots of the shell through the fixed keys of the end covers and are respectively fixed on two sides of the block-type rotor iron cores.
Preferably, the stator winding iron core, the stator permanent magnet iron core and the segmented rotor iron core are made of magnetic conductive materials, and the rotor support and the motion shaft are made of non-magnetic conductive materials.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
The stator winding iron core adopts a salient pole structure with integrated design, so that the processing difficulty can be reduced, and the reliability of the structure can be improved; the permanent magnet of the linear oscillating motor is embedded in the stator core, and the stator permanent magnet type structure can effectively avoid irreversible damage of the permanent magnet with low mechanical strength caused by mechanical stress, is more beneficial to heat dissipation of the permanent magnet, avoids irreversible demagnetization of the permanent magnet caused by temperature rise, improves safety and reliability and prolongs service life; in addition, as the permanent magnet is not used as a moving structure and is embedded in the stator core, the permanent magnet sheath can be prevented from being arranged, the mechanical air gap of the motor is reduced, the coupling between the stator and the rotor is enhanced, and the utilization rate of the permanent magnet material is improved. The motor adopts a direct drive structure, replaces a complex crank-connecting rod mechanism in the prior art to generate linear reciprocating motion, and has more compact structure. In addition, the motor permanent magnet provided by the invention has the advantages of less consumption and low cost.
Further, bipolar flux linkage is generated by means of the mutual coordination of the reciprocating motion position change of the rotor core and the single-phase sinusoidal current of the armature, and compared with a traditional unipolar flux linkage motor, the motor efficiency and the power density are improved.
Further, the multi-unit combined stator permanent magnet linear oscillating motor is formed by rotationally symmetrically fixing a plurality of stator permanent magnet linear oscillating motors on a cylindrical rotor support, so that normal electromagnetic force can be weakened, motor thrust fluctuation can be reduced, and noise and vibration of motor operation are reduced.
Further, the rotor core block, the cylindrical support and the moving shaft jointly form a moving structure of the linear motor, the moving shaft is sleeved on a linear moving bearing arranged on the end cover, and the rotor structure is prevented from being deviated to influence the motor performance or cause friction loss.
Drawings
FIG. 1 is a partial cross-sectional view of a stator permanent magnet linear oscillating motor provided by the invention taken perpendicular to a movement plane;
Fig. 2 (a) is a schematic diagram of a position of a rotor core when the stator permanent magnet linear oscillating motor provided by the invention generates a maximum positive polarity armature flux linkage, fig. 2 (b) is a schematic diagram of a position of a rotor core when the stator permanent magnet linear oscillating motor provided by the embodiment of the invention generates a zero value armature flux linkage, and fig. 2 (c) is a schematic diagram of a position of a rotor core when the stator permanent magnet linear oscillating motor provided by the embodiment of the invention generates a maximum negative polarity armature flux linkage;
FIG. 3 is one of the partial cross-sectional views of the multi-unit combined stator permanent magnet linear oscillating motor provided by the invention;
FIG. 4 is a second partial cross-sectional view of a multi-unit combined stator permanent magnet linear oscillating motor provided by the invention;
fig. 5 is a schematic diagram of a three-dimensional structure of a rotor of the multi-unit combined stator permanent magnet linear oscillating motor provided by the invention;
fig. 6 is a schematic diagram of a three-dimensional structure of an end cover of a multi-unit combined stator permanent magnet linear oscillating motor provided by the invention;
Fig. 7 (a) is an oblique two-dimensional view of a casing of the multi-unit combined stator permanent magnet type linear oscillating motor provided by the invention, and fig. 7 (b) is a front view of a casing of the multi-unit combined stator permanent magnet type linear oscillating motor provided by the invention;
Fig. 8 is a schematic diagram of structural parameters of a stator permanent magnet linear oscillating motor provided by the invention;
fig. 9 is a schematic diagram of output thrust and motion speed of the multi-unit combined stator permanent magnet linear oscillating motor provided by the invention.
The same reference numbers are used throughout the drawings to reference like elements or structures, wherein:
1-a stator winding iron core 2-an armature winding 3-a stator permanent magnet iron core 4-a permanent magnet 5-a segmented rotor iron core 6-a rotor support 7-a motion shaft 8-a linear motion bearing 9-an end cover 10-a shell 11-a resonant spring.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention provides a stator permanent magnet linear oscillating motor, which comprises: a stator assembly and a mover assembly;
the stator assembly comprises a stator winding iron core 1, an armature winding 2, a stator permanent magnet iron core 3 and a permanent magnet 4;
The stator winding iron core 1 comprises 2N+1 equal-height equal-width stator teeth uniformly distributed on a yoke part and a stator yoke thereof, wherein N is the number of single-phase winding coils of the stator winding iron core, and N is an integer greater than or equal to 1; wherein the middle teeth and the armature winding 2 jointly form a motor armature; the plane structure of the stator permanent magnet iron core 3 is concave, and the permanent magnet 4 is embedded in the groove of the stator permanent magnet iron core 3; the stator winding iron core 1 and the stator permanent magnet iron core 3 are equal in length and are placed in an up-down alignment manner;
The rotor assembly comprises a rotor bracket 6 and a segmented rotor core 5; the block type rotor iron core 5 comprises 3N+1 iron core blocks with the same shape, and the iron core blocks are fixed on the rotor support at equal intervals and do reciprocating linear motion along the axis direction of the rotor support 6.
Specifically, fig. 1 is a partial sectional view of the stator permanent magnet linear oscillating motor provided by the invention, which is cut perpendicular to a movement plane when the number N of single-phase winding coils of a stator winding core is 1, namely, the stator winding core comprises 3 stator teeth and the segmented rotor core comprises 4 core blocks.
It can be understood that when N is 2, the number of stator teeth in the figure is 2n+1=5, the number of segmented rotor core blocks is 3n+1=7, and so on, and the number of stator teeth and the number of segmented rotor core blocks are determined according to the value of N.
As shown in fig. 1, the planar structure of the stator permanent magnet core 3 is concave, i.e. has a groove, and the planar structure is used for embedding the permanent magnet 4, i.e. the permanent magnet 4 is embedded in the groove of the stator permanent magnet core 3, the stator winding core 1 and the stator permanent magnet core 3 are equal in length and are aligned up and down, and the number of the permanent magnets is only 1. It can be understood that the magnetizing direction of the permanent magnet 4 is the moving direction of the rotor, and the slot center line of the permanent magnet is the same as the center line of the stator winding core 1.
The stator winding iron core is formed by symmetrically distributing 3 stator teeth with equal height and equal width on a stator yoke at equal intervals, so that the integrated design is realized, the processing is easy, the processing difficulty is reduced, and the reliability of the structure is improved. The middle teeth of the stator winding iron core are used as an armature iron core and form a motor armature together with the armature winding.
According to the motor provided by the embodiment of the invention, the stator winding iron core adopts the salient pole structure with integrated design, so that the processing difficulty can be reduced, and the reliability of the structure can be improved. The permanent magnet of the linear oscillating motor is embedded in the stator core, and the stator permanent magnet type structure can effectively avoid irreversible damage of the permanent magnet with low mechanical strength caused by mechanical stress, is more beneficial to heat dissipation of the permanent magnet, avoids irreversible demagnetization of the permanent magnet caused by temperature rise, improves safety and reliability and prolongs service life; in addition, as the permanent magnet is not used as a moving structure and is embedded in the stator core, the permanent magnet sheath can be prevented from being arranged, the mechanical air gap of the motor is reduced, and the coupling between the stator and the rotor is enhanced. The motor adopts a direct drive structure, replaces a complex crank-connecting rod mechanism in the prior art to generate linear reciprocating motion, and has more compact structure. In addition, the motor permanent magnet provided by the invention has the advantages of less consumption and low cost.
Preferably, the coils of the armature winding 2 are all supplied with sinusoidal alternating current, and the energizing frequency of the sinusoidal alternating current is the same as the reciprocating frequency of the rotor assembly, so as to generate bipolar armature flux linkage; the air gap magnetic field is generated by the armature current and the permanent magnet together, so that the armature current and the permanent magnet act on the rotor assembly to generate quasi-sine electromagnetic thrust.
Specifically, the armature winding is supplied with single-phase sinusoidal alternating current, and a flux linkage path is formed by virtue of the armature core, the stator winding core side teeth, the motor air gap, the rotor core, the stator permanent magnet core and the permanent magnet, so that quasi-sinusoidal magnetomotive force is formed in the motor air gap, quasi-sinusoidal electromagnetic thrust acting on the motor rotor core is generated, namely, an air gap magnetic field is generated by the armature current and the permanent magnet together, and quasi-sinusoidal electromagnetic thrust is generated by acting on the rotor assembly.
The coils of the armature winding are all electrified with sinusoidal alternating current, the electrifying frequency of the coils is the same as the reciprocating frequency of the rotor assembly, and bipolar magnetic links with the same amplitude, the same frequency and the same phase are generated by means of the mutual coordination of the reciprocating position change of the rotor core and the armature based on the magnetic flux switching principle; as shown in fig. 2 (a), 2 (b) and 2 (c), fig. 2 (a) is a schematic diagram of a position of a rotor core when a single-phase winding coil number N of a stator winding core is 1 and a maximum positive polarity armature flux linkage is generated in the stator permanent magnet type linear oscillating motor provided by the embodiment of the invention, fig. 2 (b) is a schematic diagram of a position of a rotor core when a single-phase winding coil number N of a stator winding core is 1 and a zero value armature flux linkage is generated in the stator permanent magnet type linear oscillating motor provided by the embodiment of the invention, and fig. 2 (c) is a schematic diagram of a position of a rotor core when a single-phase winding coil number N of a stator winding core is 1 and a maximum negative polarity armature flux linkage is generated in the stator permanent magnet type linear oscillating motor provided by the embodiment of the invention.
The motor air gap magnetic field is generated by armature current and the permanent magnet 4 together, so that the armature current acts on the rotor assembly to generate quasi-sinusoidal electromagnetic thrust.
It is noted that the special structure of the invention is an essential reason for realizing the normal operation of the motor.
The motor provided by the embodiment of the invention generates bipolar flux linkage by means of the mutual coordination of the reciprocating motion position change of the rotor core and the single-phase sinusoidal current of the armature based on the magnetic flux switching principle, and compared with the traditional unipolar flux linkage motor, the motor has improved efficiency and power density.
Preferably, the cross section of the rotor core block is isosceles trapezoid, and the side width W ru of the adjacent stator winding core, the side width W rd of the adjacent stator permanent magnet core and the center line spacing W ri between the rotor core blocks and the tooth width W sc of the stator teeth respectively meet the following relations:
Wru＝1.7Wsc；
Wrd＝Wsc；
wherein W si is the stator tooth spacing.
Preferably, the length L r of the mover support and the side width W ru of the adjacent stator winding core and the center line spacing W ri between the mover core blocks satisfy the following relationship:
Lr＝Wru+3NWri。
the embodiment of the invention provides a multi-unit combined stator permanent magnet type linear oscillating motor, which comprises a plurality of stator permanent magnet type linear oscillating motors according to any one of the embodiments, wherein a rotor support is cylindrical, and a plurality of stator permanent magnet type linear oscillating motors with the same structure are rotationally symmetrically arranged on the rotor support.
Specifically, fig. 3 is a partial sectional view of the multi-unit combined stator permanent magnet linear oscillating motor provided by the invention, which is obtained by cutting the multi-unit combined stator permanent magnet linear oscillating motor parallel to the surface of a chassis when the number of multi-units is 4 and the number of single-phase winding coils N of a stator winding iron core is 1; fig. 4 is a partial cross-sectional view of the multi-unit combined stator permanent magnet linear oscillating motor provided by the embodiment of the invention, which is obtained by sectioning a through-axis orthogonal plane when the number of single-phase winding coils N of a stator winding iron core is 1, and as shown in fig. 3-4, the multi-unit combined stator permanent magnet linear oscillating motor comprises four bilateral stator permanent magnet linear motors with the same structure, which are rotationally symmetrically arranged on a cylindrical rotor bracket, and are sequentially spaced by 90 degrees in space, wherein the number of single-phase winding coils N of the stator winding iron core of each stator permanent magnet linear motor is 1, namely, the stator winding iron core comprises 3 stator teeth, and the segmented rotor iron core comprises 4 iron core blocks.
Fig. 5 is a three-dimensional diagram of a rotor assembly of the multi-unit combined stator permanent magnet linear oscillating motor comprising 4 stator permanent magnet linear oscillating motors, and as shown in fig. 5, a segmented rotor core 5 of four bilateral linear oscillating motors is composed of four rotor core blocks with the same shape and equal intervals, and the segmented rotor core blocks are sequentially fixed on a cylindrical rotor support in a staggered manner by 90 degrees, are rotationally symmetrical and do reciprocating linear oscillating motion along the axial direction of the cylindrical rotor support. The four groups of armature winding coils can be connected in series or in parallel in the same direction, so that the same single-phase alternating current is supplied, and the energizing frequency of the four groups of armature winding coils is the same as the reciprocating frequency of the rotor structure.
It can be understood that the magnetizing directions of the permanent magnets of the plurality of permanent magnet linear oscillating motors are the same. The cylindrical rotor support plays a role in fixing the rotor core, and a plurality of permanent magnet linear oscillating motors are rotationally symmetrically arranged on the cylindrical rotor support, and the number of degrees which are sequentially spaced in space, namely 360 degrees divided by the number of the permanent magnet linear oscillating motors, for example: if the multi-unit combined stator permanent magnet type linear oscillating motor comprises 3 permanent magnet type linear oscillating motors, the permanent magnet type linear oscillating motors are sequentially spaced by 120 degrees in space and are rotationally symmetrically arranged on the cylindrical rotor support. The armature winding coils of the multiple groups can be connected in series or in parallel in the same direction, so that the same single-phase alternating current is supplied, and the energizing frequency of the armature winding coils is the same as the reciprocating frequency of the mover structure.
The motor provided by the embodiment of the invention is formed by rotationally and symmetrically fixing a plurality of bilateral linear oscillating motors on the cylindrical rotor support, so that the normal electromagnetic force can be weakened, the thrust fluctuation of the motor can be reduced, and the noise and vibration of the motor in operation are reduced.
Preferably, the mover support is in a hollow structure.
The motor provided by the embodiment of the invention is used for fixing the cylindrical rotor support of the block rotor core, and adopts a hollowed-out structure, so that the quality of the rotor structure is reduced, and the motor driving efficiency is improved.
Preferably, the diameter d ro of the bottom surface outer circle of the mover support and the tooth height H si of the stator teeth satisfy the following relationship:
dro＝Hsi+Hf+2Hgap+Hs+Hr；
Wherein, H f is the height of a stator yoke, H gap is the air gap of the motor, H s is the height of a stator permanent magnet core, and H r is the height of a rotor core block.
Further, it can be understood that, since the mover support is cylindrical, the cylinder length of the mover support, that is, the length L r of the mover support, and the center line spacing W ri between the adjacent stator winding core side width W ru and the mover core block satisfy the following relationship:
Lr＝Wru+3NWri。
Preferably, the mover assembly further comprises moving shafts 7 which are coaxial with the mover support and are respectively fixed at two end parts of the mover support, and the moving shafts 7 are sleeved with resonant springs 11 with equal length.
Specifically, as shown in fig. 5, two moving shafts 7 are coaxial with a cylindrical mover frame 6, and are fixed to the ends of the mover frame 6, respectively; two resonant springs 9 of equal length are respectively sleeved on the two moving shafts 7. The rotor core is fixed on the cylindrical support, forms a moving structure together with the moving shaft, and the resonant spring sleeved on the moving shaft supplies resonant thrust.
Optionally, the moving shaft 7 and the segmented rotor core 5 can be fixed by means of a fixing hole of the cylindrical rotor bracket, and the fixing mode can be selected as welding or hot sheathing;
Optionally, two resonant springs 11 with equal length are respectively sleeved on the two moving shafts 7, and when the central line of the mover structure moves to the central line of the stator, the two resonant springs are in a compressed state, and the elastic coefficient k, the total mass m of the moving part and the moving frequency f of the mover are required to satisfy the following conditions: )。
alternatively, the compression threshold of the resonant spring 11 is slightly greater than the motor stroke.
Preferably, the linear motion bearing 8, the end cover 9 and the casing 10 are also included; the linear motion bearing 8 is positioned at the geometric center of the end cover 9, and the motion shaft 7 is sleeved on the linear motion bearing 8; the stator winding iron cores 1 and the stator permanent magnet iron cores 3 of the stator permanent magnet linear oscillating motors are mutually matched with the fixed grooves of the shell 10 through the fixed keys of the end covers 9, and are respectively fixed on two sides of the block type rotor iron cores 5.
Specifically, the cylindrical rotor support 6, the linear motion bearing 8, the end cover 9 and the casing 10 are used as fixing devices of the motor main body, as shown in fig. 6, fig. 7 (a) and fig. 7 (b), the stator winding iron cores and the stator permanent magnet iron cores of the four bilateral linear motors are fixed on two sides of the rotor iron cores by means of the fixing grooves of the casing and the fixing keys of the end cover, so that the stator structures of the four bilateral linear motors are sequentially spaced by 90 degrees, and the stator structure is simple to assemble and strong in structural stability.
The linear motion bearing 8 is located at the geometric center of the end cover and functions to assemble the motion shaft 7 with the fixed structure so that the air gap between the mover structure and the stator structure is equal in width.
Compared with the cylindrical linear motor in the prior art, the motor provided by the embodiment of the invention has a relatively simple structure and is beneficial to assembly. The mover core block, the cylindrical support and the moving shaft jointly form a moving structure of the linear motor, the moving shaft is sleeved on a linear motion bearing arranged on the end cover, and the mover structure is prevented from being deviated to influence the motor performance or cause friction loss.
Preferably, the stator winding iron core 1, the stator permanent magnet iron core 3 and the segmented rotor iron core 5 are made of magnetic conductive materials, and the rotor support 6 and the motion shaft 7 are made of non-magnetic conductive materials.
Specifically, the stator winding iron core 1, the stator permanent magnet iron core 3 and the segmented rotor iron core 5 are made of magnetic conductive materials, such as non-oriented silicon steel sheets, which are laminated in the transverse direction; the cylindrical rotor support 6 and the motion shaft 7 are made of high-strength non-magnetic materials, such as aluminum alloy materials.
In addition, care must be taken in the insulation process during manufacture to ensure motor performance, such as insulation between non-oriented silicon steel laminations, insulation between coil conductors, and insulation between armature windings and stator slots.
In order to further illustrate the multi-unit combined stator permanent magnet type linear oscillating motor provided by the embodiment of the invention, the stable motion performance of the multi-unit combined stator permanent magnet type linear oscillating motor composed of 4 stator permanent magnet type linear oscillating motors shown in fig. 3-4 is analyzed, wherein main parameters of each stator permanent magnet type linear oscillating motor are shown in fig. 8, and an analysis result is shown in fig. 9, so that the multi-unit combined stator permanent magnet type linear oscillating motor provided by the embodiment of the invention has good stability.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. A multi-unit combined stator permanent magnet type linear oscillating motor is characterized by comprising a plurality of stator permanent magnet type linear oscillating motors; the stator permanent magnet linear oscillating motor comprises a stator assembly and a rotor assembly;
the stator assembly comprises a stator winding iron core (1), an armature winding (2), a stator permanent magnet iron core (3) and a permanent magnet (4);
the stator winding iron core (1) comprises 2N+1 equal-height equal-width stator teeth uniformly distributed on the yoke part and a stator yoke thereof, wherein N is the number of single-phase winding coils of the stator winding iron core; wherein, the middle teeth and the armature winding (2) form a motor armature together; the plane structure of the stator permanent magnet iron core (3) is in a concave shape, the permanent magnets (4) are embedded in grooves of the stator permanent magnet iron core (3), the number of the permanent magnets (4) in each permanent magnet iron core is only 1, the magnetizing direction of the permanent magnets (4) is the mover moving direction, and the center line of the grooves where the permanent magnets (4) are positioned is the same as the center line of the stator winding iron core (1); the stator winding iron core (1) and the stator permanent magnet iron core (3) are equal in length and are placed in an up-down alignment mode;
The rotor assembly comprises a rotor support (6) and a segmented rotor iron core (5), wherein the rotor support (6) is of a cylindrical hollow structure; a plurality of segmented rotor cores (5) with the same structure are rotationally symmetrically arranged on the rotor bracket (6); the rotor assembly further comprises a moving shaft (7) which is coaxial with the rotor support (6) and is respectively fixed at two end parts of the rotor support (6), and resonant springs (11) with equal length are sleeved on the moving shaft (7); the segmented rotor core (5) comprises 3N+1 rotor core blocks with the same shape, wherein the rotor core blocks are fixed on a rotor support (6) at equal intervals and do reciprocating linear motion along the axial direction of the rotor support (6);
The coils of the armature winding (2) are all electrified with sine alternating current, and the electrified frequency of the coils is the same as the reciprocating frequency of the rotor assembly so as to generate bipolar armature flux linkage;
The stator winding iron core (1), the stator permanent magnet iron core (3) and the segmented rotor iron core (5) are made of magnetic conductive materials, and the rotor support (6) and the motion shaft (7) are made of non-magnetic conductive materials.
2. The multi-unit combined stator permanent magnet type linear oscillating motor according to claim 1, wherein the cross section of the rotor core block is isosceles trapezoid, and the side width W ru of the adjacent stator winding, the side width W rd of the adjacent stator permanent magnet core, the center line spacing W ri between the rotor core blocks and the tooth width W sc of the stator teeth respectively satisfy the following relations:
Wru＝1.7Wsc；
Wrd＝Wsc；
wherein W si is the stator tooth spacing.
3. The multi-unit combined stator permanent magnet type linear oscillating motor according to claim 1, wherein the length L r of the mover frame and the width W ru of the side of the stator winding core and the center line spacing W ri between the mover core blocks satisfy the following relationship:
Lr＝Wru+3NWri。
4. The multi-unit combined stator permanent magnet type linear oscillating motor according to claim 1, wherein the outer circle diameter d ro of the mover bracket and the tooth height H si of the stator teeth satisfy the following relationship:
dro＝Hsi+Hf+2Hgap+Hs+Hr；
Wherein, H f is the height of a stator yoke, H gap is the air gap of the motor, H s is the height of a stator permanent magnet core, and H r is the height of a rotor core block.
5. The multi-unit combined stator permanent magnet type linear oscillating motor according to claim 1, further comprising a linear motion bearing (8), an end cover (9) and a casing (10); the linear motion bearing (8) is positioned at the geometric center of the end cover (9), and the motion shaft (7) is sleeved on the linear motion bearing (8); the stator winding iron cores (1) and the stator permanent magnet iron cores (3) of the stator permanent magnet linear oscillating motor are mutually matched with the fixed grooves of the shell (10) through the fixed keys of the end covers (9) and are respectively fixed on two sides of the block type rotor iron cores (5).
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