Electro-magnetic linear motor and primary structure thereof

Abstract

The invention discloses an electro-magnetic linear motor and a primary structure thereof, and the primary structure comprises a magnetism gathering center body which is made of a magnetic material and is in a preset regular shape; the plurality of silicon steel sheet superposition bodies are arranged on the magnetism gathering center body in a sleeving manner and are sequentially and uniformly distributed in the length direction of the magnetism gathering center body, so that a plurality of wire slots are formed in the magnetism gathering center body; the plurality of armature windings are respectively arranged in the wire slots and are wound on the magnetism gathering center body; the plurality of excitation windings are respectively arranged in the wire slots and are wound on the magnetism gathering center body, and the winding directions of the excitation windings of the adjacent wire slots are opposite. According to the technical scheme, the excitation current can be flexibly adjusted, weak magnetic operation can be avoided during high-speed operation, the efficiency and the power factor of the system are improved, low-speed large-torque performance and high-speed wide-speed-range performance can be considered, and no excitation loss risk exists during operation in an overload, high-temperature or strong-vibration environment.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and specifically to an electro-excited linear motor and its primary structure. Background Art

[0002] In the technical field of motors, linear motors, as a special type of motor capable of achieving linear motion, have received extensive attention and applications. However, the existing linear motors still have some deficiencies in many aspects, which limit the performance and application scope of linear motors.

[0003] For example, the efficiency and power factor of existing linear motors are relatively low. This is mainly due to energy losses inside the motor, such as magnetic leakage, magnetic resistance loss, copper loss, etc. These losses not only reduce the efficiency of the motor but also increase energy consumption and operating costs. Therefore, improving the efficiency and power factor of linear motors has become an urgent problem to be solved. Summary of the Invention

[0004] The present invention provides an electro-excited linear motor and its primary structure, and the purpose is to improve the efficiency and power factor of the linear motor.

[0005] Specifically, in the first aspect, the present invention provides a primary structure of an electro-excited linear motor, including: A magnetic flux concentrating center body, which is made of a magnetic material and has a preset regular shape; A plurality of silicon steel sheet stacks, which are all sleeved on the magnetic flux concentrating center body and are evenly distributed in sequence in the length direction of the magnetic flux concentrating center body to form a plurality of wire grooves on the magnetic flux concentrating center body; A plurality of armature windings, which are respectively arranged in each of the wire grooves and wound around the magnetic flux concentrating center body; A plurality of field windings, which are respectively arranged in each of the wire grooves and wound around the magnetic flux concentrating center body, wherein the winding directions of the field windings in adjacent wire grooves are opposite.

[0006] Further, each magnetic flux concentrating side is provided with a U-shaped mounting groove, and each magnet is respectively assembled in the U-shaped mounting groove on its corresponding magnetic flux concentrating side.

[0007] Further, the magnetic flux concentrating center body is made of SMC soft magnetic material, and carbon steel is attached to the outer surface of the magnetic flux concentrating center body.

[0008] Further, each silicon steel sheet stack is provided with a magnetic shoe for reducing the distance between adjacent silicon steel sheet stacks.

[0009] Further, the silicon steel sheet stack is a splicing body formed by stacking a plurality of non-oriented silicon steel sheets or oriented silicon steel sheets in the length direction of the magnetic flux concentrating center body.

[0010] Further, the primary structure is formed by curing with epoxy resin after assembling each of the silicon steel sheet stacks to the magnetic focusing center body and arranging each of the armature windings in its corresponding slot.

[0011] Further, the magnetic focusing center body is cylindrical, and a positioning device is provided on each of the silicon steel sheet stacks for maintaining the consistency of the direction of each of the silicon steel sheet stacks.

[0012] In a second aspect, the present invention further provides an electric-excitation linear motor, including: a secondary structure, and the primary structure according to any one of the above.

[0013] Further, the secondary structure includes a plurality of secondary plates, and the plurality of secondary plates are sequentially connected to form a long slot with a preset shape; the primary structure is assembled in the long slot and can move in the length direction of the long slot.

[0014] Further, the plurality of secondary plates are integrally formed to form the secondary structure.

[0015] The excitation magnetic field can be dynamically controlled by adjusting the current of the excitation winding to adapt to different load or speed requirements (such as field weakening for speed increase, overload protection, etc.). Under complex working conditions (such as sudden load change, temperature change), the current of the excitation winding can compensate for the asymmetry of the air-gap magnetic field and suppress thrust fluctuations or vibrations. When running at high speed, field weakening operation can be avoided, and the efficiency of the system can be improved. The electric-excitation method has no risk of field loss in high-temperature or strong-vibration environments. By adjusting the phase of the excitation current, the inductive reactive power of the armature winding can also be balanced, and the power factor of the system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the primary structure of an electric-excitation linear motor in an embodiment of the present invention; Figure 2 is a cross-sectional view of the primary structure of an electric-excitation linear motor in another embodiment of the present invention; Figure 3 is a schematic structural diagram of the primary structure of an electric-excitation linear motor in still another embodiment of the present invention; Figure 4 is a schematic structural diagram of an electric-excitation linear motor in still another embodiment of the present invention; Figure 5 is a schematic structural diagram of another electric-excitation linear motor in an embodiment of the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In the description, claims, and the above accompanying drawing description of this application, terms such as "first" and "second" are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is merely a way of distinguishing objects with the same attributes when describing embodiments of this application. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product, or device comprising a series of units need not be limited to those units, but may include other units not explicitly listed or inherent to these processes, methods, products, or devices.

[0018] Please refer to Figures 1 - 5 , wherein Figure 1 shown is a schematic diagram of the primary structure of an electro-magnetic-excitation linear motor in an embodiment of the present invention. The primary structure includes a magnetic focusing central body 11, a plurality of armature windings 12, a plurality of silicon steel sheet stacks 13, and a plurality of excitation windings 15. The magnetic focusing central body 11 is made of a magnetic material and has a preset regular shape, such as a cuboid shape or a cylinder shape. The silicon steel sheet stack 13 is a spliced body formed by stacking a plurality of silicon steel sheets on the magnetic focusing central body 11; the magnetic focusing central body 11 can play a role in magnetic focusing during the operation of the electro-magnetic-excitation linear motor, enhancing the electromagnetic induction intensity between the secondary structure and the primary structure.

[0019] Each silicon steel sheet stack 13 is sleeved on the magnetic focusing central body 11, and the silicon steel sheet stacks 13 are evenly spaced along the length direction of the magnetic focusing central body 11, thereby forming a plurality of wire grooves 14 on the magnetic focusing central body 11. The wire grooves 14 are the positions between adjacent silicon steel sheet stacks 13 on the magnetic focusing central body 11. Each armature winding 12 is disposed in a corresponding wire groove 14 and wound around the magnetic focusing central body 11 at the corresponding wire groove.

[0020] The excitation winding 15 is disposed in the wire groove 14 and wound around the magnetic focusing central body 11, wherein the winding directions of the excitation windings 15 in adjacent wire grooves 14 are opposite. For example, in the odd-numbered wire grooves 14 in the length direction of the magnetic focusing central body 11, the winding direction of the excitation winding 15 is clockwise, and in the even-numbered wire grooves 14, the winding direction of the excitation winding 15 is counterclockwise.

[0021] After the exciting winding is energized, a main magnetic field is generated. The intensity and direction of the main magnetic field can be adjusted by current. The main magnetic field interacts with the armature magnetic field generated by the armature winding current to generate thrust, realizing the mutual conversion between electrical energy and mechanical energy. The exciting magnetic field can be dynamically controlled by adjusting the exciting winding current to adapt to different load or speed requirements. When operating at high speed, weak magnetic operation can be avoided, improving the efficiency of the system. At the same time, it can take into account the performance of high torque at low speed and wide speed range at high speed. There is no risk of demagnetization when operating in overload, high temperature or strong vibration environments. In addition, under complex working conditions (such as sudden load changes and temperature changes), the exciting winding current can compensate for the asymmetry of the air-gap magnetic field, suppressing thrust fluctuations or vibrations. In some embodiments of the present invention, the magnetic flux concentrating central body 11 is made of SMC soft magnetic material, and carbon steel is attached to the outer surface of the magnetic flux concentrating central body 11. The thickness of the carbon steel can be set between 0.2 mm and 0.6 mm. SMC soft magnetic body is a new type of iron-based powder magnetic material, which has a wide range of applications in the field of power electronic components. The characteristics of SMC soft magnetic body are low high-frequency eddy current loss and high saturation magnetic induction intensity. The magnetic properties of SMC soft magnetic body are relatively stable and are not easily affected by temperature and time. These characteristics are beneficial to the long-term operation stability of DC motors.

[0022] Although the SMC soft magnetic body has low strength and low efficiency at low frequencies, it may exhibit better performance than traditional materials during high-frequency operation due to its low eddy current loss. Therefore, in this embodiment, carbon steel is attached to the surface of the SMC soft magnetic body in the magnetic flux concentrating central body 11 to increase the overall strength of the SMC soft magnetic body.

[0023] In some embodiments of the present invention, each grain-oriented silicon steel 13 is provided with a plurality of magnetic shoes 151, and the magnetic shoes 151 are respectively arranged at the top and bottom of the front and back sides of the corresponding grain-oriented silicon steel 13, where the front and back directions are the length direction of the magnetic flux concentrating central body 11.

[0024] During the operation of the linear motor, the space formed by the wire grooves 14 may generate thrust fluctuations due to magnetic field non-uniformity or other factors. Such fluctuations will not only affect the running stability of the motor, but may also cause an increase in the noise and a shortening of the life of the DC motor. Therefore, in this embodiment, the tooth shoes 151 are arranged on the silicon steel 13, which can not only effectively ensure the winding space of the armature winding 12, but also shorten the distance between adjacent silicon steels 13 to improve the uniformity of the magnetic field distribution of the secondary structure and reduce the thrust fluctuations of the permanent magnet DC motor.

[0025] In some embodiments of the present invention, the silicon steel sheet stack 13 is a splicing body formed by stacking a plurality of non-oriented silicon steel sheets or grain-oriented silicon steel sheets in the length direction of the magnetic flux concentrating central body.

[0026] In this embodiment, if the silicon steel sheet stack 13 uses non-oriented silicon steel sheets, the non-oriented silicon steel sheets are stacked in the length direction of the magnetic focusing central body 11 to form the silicon steel sheet stack 13. If the silicon steel sheet stack 13 uses oriented silicon steel sheets, first, a plurality of oriented silicon steel sheets are spliced into a silicon steel sheet, and the magnetic orientation of each oriented silicon steel sheet is the central direction of the silicon steel sheet. Then, a plurality of silicon steel sheets are stacked in the length direction of the magnetic focusing central body 11 to obtain the silicon steel sheet stack.

[0027] In some embodiments of the present invention, the primary structure 10 is formed by curing with epoxy resin after assembling a plurality of silicon steel sheet stacks 13 onto the magnetic focusing central body 11 and respectively arranging each armature winding 12 in its corresponding slot 14.

[0028] In this embodiment, epoxy resin is used to cure and form the primary structure, which can prevent the primary structure from deforming and ensure the stability and safety of the primary structure.

[0029] In some embodiments of the present invention, the magnetic focusing central body 11 is cylindrical, and a positioning device is provided on each silicon steel sheet stack 13. The positioning device is used to maintain the consistency of the direction of each silicon steel sheet stack 13.

[0030] In this embodiment, the positioning device on the silicon steel sheet stack 13 includes a first positioning hole 131 and a second positioning hole 132. After assembling each silicon steel sheet stack 13 onto the magnetic focusing central body 11, the first positioning holes 131 of each silicon steel sheet stack 13 are connected, and the second positioning holes 132 of each silicon steel sheet stack 13 are connected.

[0031] In this embodiment, using the positioning device to position each silicon steel sheet stack 13 can make the direction of the silicon steel sheet stack 13 consistent and improve the stability of the primary structure 10.

[0032] In some embodiments of the present invention, the linear motor of the present invention includes a primary structure 10 and a secondary structure 20. The secondary structure 10 can be the primary structure in any of the above embodiments. Since the primary structure 10 has been described in detail in the above embodiments, in order to avoid repetition, it will not be described in detail in this embodiment.

[0033] In some embodiments of the present invention, the secondary structure 20 includes a plurality of secondary plates. The plurality of secondary plates are sequentially connected to form a long groove with a preset shape. The primary structure 10 is assembled in the long groove and can move in the length direction of the long groove.

[0034] For example, the secondary structure 20 includes a first secondary plate 211, a second secondary plate 212, and a third secondary plate 213. The first secondary plate 211, the second secondary plate 212, and the third secondary plate 213 are sequentially connected to form a U-shaped long groove 210, and the length direction of the U-shaped long groove 210 is the same as the length directions of the first secondary plate 211, the second secondary plate 212, and the third secondary plate 213. The primary structure 10 is assembled in the U-shaped long groove 210, matching the shape of the U-shaped long groove 210, and the length direction is the length direction of the U-shaped long groove 210.

[0035] In some embodiments of the present invention, the multiple secondary plates of the secondary structure 20 are integrally formed.

[0036] In this embodiment, the multiple secondary plates of the secondary structure 20 are manufactured by an integral forming technique, that is, they are no longer manufactured separately and then assembled, but directly formed as a whole during the manufacturing process.

[0037] In this embodiment, setting the multiple secondary plates of the secondary structure 20 integrally formed can not only reduce the assembly error between components, improve the overall accuracy and reliability of the DC motor, but also reduce the assembly steps and lower the production cost of the DC motor.

[0038] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. The primary structure of an electro-excited linear motor, characterized in that, Comprising: A magnetic flux concentrating core body, which is made of a magnetic material and has a preset regular shape; Multiple stacks of silicon steel sheets, which are all sleeved on the magnetic flux concentrating core body and are evenly distributed in sequence in the length direction of the magnetic flux concentrating core body to form multiple wire grooves on the magnetic flux concentrating core body; Multiple armature windings, which are respectively arranged in each of the wire grooves and wound around the magnetic flux concentrating core body; Multiple exciting windings, which are respectively arranged in each of the wire grooves and wound around the magnetic flux concentrating core body, wherein the winding directions of the exciting windings in adjacent wire grooves are opposite.

2. The primary structure according to claim 1, wherein: The magnetic flux concentrating core body is made of SMC soft magnetic material, and carbon steel is attached to the outer surface of the magnetic flux concentrating core body.

3. The primary structure according to claim 1, wherein: Each stack of silicon steel sheets is provided with a magnetic shoe for reducing the distance between adjacent stacks of silicon steel sheets.

4. The primary structure according to claim 1, wherein: The stack of silicon steel sheets is a splicing body formed by stacking multiple non-oriented silicon steel sheets or oriented silicon steel sheets in the length direction of the magnetic flux concentrating core body.

5. The primary structure according to claim 1, wherein: The primary structure is formed by curing with epoxy resin after assembling each stack of silicon steel sheets to the magnetic flux concentrating core body and arranging each armature winding in its corresponding wire groove.

6. The secondary structure according to claim 1, wherein: The magnetic flux concentrating core body is cylindrical, and a positioning device is provided on each stack of silicon steel sheets for maintaining the consistency of the direction of each stack of silicon steel sheets.

7. An electric-excitation linear motor, characterized in that, Comprising: A secondary structure and the primary structure according to any one of claims 1-6.

8. The electro-magnetic linear motor according to claim 7, wherein: The secondary structure includes multiple secondary plates, and the multiple secondary plates are sequentially connected to form a long groove of a preset shape; the primary structure is assembled in the long groove and can move in the length direction of the long groove.

9. The electro-magnetic linear motor according to claim 8, wherein: The multiple secondary plates are integrally formed to form the secondary structure.

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