A block stator tooth yoke part permanent magnet auxiliary switched reluctance motor
Patent Information
- Application Number
- CN202611186770.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-06
- Publication Date
- 2026-10-09
AI Technical Summary
然而，现有的混合励磁结构单一，多磁路复合结构拓扑构型还有待创新
[0013]本发明通过同时布置轭部永磁体和齿部永磁体，实现多磁路复合叠加，定子空间得到了充分利用，有效提升了的转矩性能，更丰富了多磁路混合励磁拓朴构型。本发明通过采用分块定子，在绕组电励磁的基础上，通过在相邻分块定子之间轭部延伸处增设轭部永磁体，在每个分块定子的两个定子齿之间增设齿部块内永磁体，以及在相邻分块定子毗邻定子齿之间增设齿部块间永磁体，不仅提升了开关磁阻电机的转矩性能，还解决了分块化设计中空间利用率不足的问题；本发明搭建的齿-轭协同辅助励磁新构型，可实现多励磁源复合磁路调控，解决了当下混合励磁结构单一的问题，丰富了多磁路混合励磁拓扑构型。
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Figure CN122890736A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of motor technology, specifically relating to a permanent magnet assisted switched reluctance motor with segmented stator yoke. Background Technology
[0002] Switched reluctance motors (SRMs), as core units of modern industrial equipment, have become a research hotspot in the field of motors due to their advantages such as simple structure, flexible control, and low cost. However, their doubly salient pole structure leads to defects in power density and torque performance. To address this bottleneck, current topology innovations mainly follow two paths: one is modular design, which shortens the magnetic flux path, reduces iron losses, and improves motor operating efficiency by isolating stator or rotor segments; simultaneously, it utilizes electromagnetic isolation effects to enhance fault tolerance and reliability. The other is hybrid excitation technology, which embeds permanent magnets as auxiliary magnetomotive force sources on top of electrical excitation to increase air gap flux, thereby improving torque density and optimizing torque ripple. The synergistic development of these two technological directions provides a feasible and forward-looking solution for breakthroughs in switched reluctance motor performance.
[0003] In modular design, the stator yoke is divided into multiple segmented stators that do not contact each other, thus forming a short magnetic circuit, reducing losses and improving efficiency. However, precisely because of this segmentation, the segmented stators are not in contact with each other and have no connection, resulting in underutilization of stator space.
[0004] Existing hybrid excitation structures are all dual-magnetic-circuit structures, consisting of a magnetic circuit generated by the stator winding excitation and a magnetic circuit generated by the permanent magnets used in the stator. By superimposing these two magnetic circuits, the magnetic flux density in the air gap between the stator and rotor is increased, thereby improving torque. However, existing hybrid excitation structures are too simplistic, and multi-magnetic-circuit composite topologies require further innovation.
[0005] Therefore, in order to solve the problems of low power density, low space utilization of modular design and simple hybrid excitation structure of switched reluctance motors, this invention proposes a permanent magnet assisted switched reluctance motor with modular stator yoke. Summary of the Invention
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] A segmented stator yoke permanent magnet assisted switched reluctance motor includes:
[0008] Multiple independent segmented stators are sequentially spliced along the circumferential direction to form an annular stator core. Each segmented stator is integrally formed with a stator yoke segment extending radially inward and stator teeth. Concentrated windings are wound on the stator teeth. The segmented stator is π-shaped and includes a stator yoke segment and two stator teeth symmetrically connected to the stator yoke segment.
[0009] The permanent magnet includes a yoke permanent magnet array, a tooth block inter-block permanent magnet array, and a tooth block intra-block permanent magnet array; the yoke permanent magnet array is installed at the yoke extension of adjacent segmented stators, the tooth block inter-block permanent magnet array is installed between adjacent stator teeth of adjacent segmented stators, and the tooth block intra-block permanent magnet array is installed between two stator teeth of each segmented stator.
[0010] The rotor is coaxially mounted on the inner side of the segmented stator, with an air gap between it and the segmented stator, and can rotate relative to it. The rotor adopts a salient pole rotor structure.
[0011] The rotating shaft is coaxially connected to the rotor.
[0012] The present invention has the following beneficial effects:
[0013] This invention achieves multi-magnetic circuit composite superposition by simultaneously arranging yoke permanent magnets and tooth permanent magnets, making full use of stator space, effectively improving torque performance, and enriching the multi-magnetic circuit hybrid excitation topology. By employing a segmented stator, this invention, based on winding electrical excitation, adds yoke permanent magnets at the yoke extension between adjacent segmented stators, adds intra-tooth permanent magnets between two stator teeth in each segmented stator, and adds inter-tooth permanent magnets between adjacent stator teeth in adjacent segmented stators. This not only improves the torque performance of the switched reluctance motor but also solves the problem of insufficient space utilization in segmented designs. The new tooth-yoke cooperative auxiliary excitation configuration built by this invention can realize multi-excitation source composite magnetic circuit control, solving the problem of the current single hybrid excitation structure and enriching the multi-magnetic circuit hybrid excitation topology. Attached Figure Description
[0014] Figure 1 This is a radial cross-sectional schematic diagram of the permanent magnet assisted switched reluctance motor with segmented stator yoke of the present invention, wherein 1-segmented stator, 2-winding, 3-permanent magnet, 4-rotor, and 5-shaft.
[0015] Figure 2 This is a schematic diagram of a stator structure composed of a segmented stator and permanent magnets, where 1-1-segmented stator yoke, 1-2-segmented stator teeth, 3-1-permanent magnets in the yoke, 3-2-permanent magnets between tooth blocks, and 3-3-permanent magnets within tooth blocks.
[0016] Figure 3 This is a schematic diagram of the excitation circuit when the motor windings of the present invention are energized without considering permanent magnets;
[0017] Figure 4 A schematic diagram of the excitation circuit when only the permanent magnet is considered and the winding is not energized;
[0018] Figure 5 This is a schematic diagram of the excitation circuit when the motor windings and permanent magnets of the present invention are simultaneously energized;
[0019] Figure 6 This is a radial cross-sectional schematic diagram of the segmented stator block internal toothed yoke permanent magnet assisted switched reluctance motor according to the present invention;
[0020] Figure 7 This is a radial cross-sectional schematic diagram of the segmented stator block inter-tooth yoke permanent magnet assisted switched reluctance motor according to the present invention. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.
[0022] Figure 1 This is a radial cross-sectional schematic diagram of a permanent magnet assisted switched reluctance motor with segmented stator yoke according to the present invention. Figure 2 for Figure 1 A schematic diagram of the middle stator. (See attached diagram) Figure 1 and Figure 2 This invention takes a two-phase 16 / 12 stator / rotor pole motor as an example, including a segmented stator 1, windings 2, permanent magnets 3, a rotor 4, and a shaft 5. The annular stator core is formed by uniformly splicing multiple independent segmented stators 1 with identical structures along the circumferential direction. Each segmented stator 1 is integrally formed with a radially inwardly extending stator yoke segment and stator teeth (the segmented stator is π-shaped, including a stator yoke segment and two stator teeth symmetrically connected to the stator yoke segment). Concentrated windings 2 are wound on the stator teeth. The permanent magnets 3 include an array of yoke permanent magnets 3-1, an array of inter-segment permanent magnets 3-2, and an array of intra-segment permanent magnets 3-3. The arrays of yoke permanent magnets 3-1 and inter-segment permanent magnets 3-2 are embedded in the yoke extensions of adjacent segmented stators 1 and between adjacent stator teeth, respectively. The array of intra-segment permanent magnets 3-3 is embedded between the two stator teeth of each segmented stator 1. All permanent magnets 3 are tangentially magnetized. The array of permanent magnets 3-1 in the yoke is tangentially magnetized in a clockwise direction; the array of permanent magnets 3-2 between the tooth blocks is tangentially magnetized in a clockwise direction; and the array of permanent magnets 3-3 inside the tooth blocks is tangentially magnetized in a counterclockwise direction. The magnetization directions of the permanent magnets 3-2 between the tooth blocks and the permanent magnets 3-3 inside the tooth blocks on both sides of the end of a certain stator tooth are symmetrical about the axis of that stator tooth. The rotor 4 and the shaft 5 are installed inside the segmented stator 1, with a uniform air gap between them, and the rotor 4 and the shaft 5 can rotate relative to each other.
[0023] refer to Figure 1For example, the entire stator consists of 8 segmented stators 1 and 24 permanent magnets 3. The segmented stators 1 are evenly distributed along the circumference. The permanent magnets 3-1 in the yoke, the permanent magnets 3-2 between the tooth blocks, and the permanent magnets 3-3 within the tooth blocks are evenly distributed along their respective circumferential arrays. The permanent magnets 3 are fixed by interference fit or bonding at the yoke extension of adjacent segmented stators 1, at the adjacent stator tooth ends of adjacent segmented stators 1, and at the two stator tooth ends of each segmented stator 1 to ensure mechanical stability.
[0024] The stator section contains three circular arrays of permanent magnets. The yoke permanent magnet array 3-1 is installed at the yoke extension of adjacent stator blocks 1. The inter-block permanent magnet array 3-2 is installed between adjacent stator teeth of adjacent stator blocks 1. The intra-block permanent magnet array 3-3 is installed between two stator teeth of a single stator block 1. Each permanent magnet array contains 8 permanent magnets 3, for a total of 24 permanent magnets 3 in the stator section. The yoke permanent magnet array 3-1 is tangentially magnetized in a clockwise direction; the two tooth permanent magnet arrays (inter-block permanent magnet array 3-2 and intra-block permanent magnet array 3-3) are magnetized in opposite directions. Specifically, the inter-block permanent magnet array 3-2 is tangentially magnetized in a clockwise direction, and the intra-block permanent magnet array 3-3 is tangentially magnetized in a counter-clockwise direction. Figure 2 As shown by the black arrow in the image.
[0025] like Figure 1 As shown, the novel segmented stator tooth yoke permanent magnet assisted switched reluctance motor of the present invention belongs to a two-phase 16 / 12 stator / rotor structure. The eight segmented stators 1 contain a total of 16 stator teeth, each with a concentrated winding 2 wound around it. The concentrated windings 2 on adjacent stator teeth generate magnetic flux in opposite directions during excitation to construct a closed magnetic circuit and achieve efficient excitation. The rotor 4 is a conventional salient-pole rotor with 12 rotor teeth evenly arranged circumferentially. An air gap is left between the ends of the rotor teeth and the ends of the stator teeth to ensure normal rotation of the rotor 4. Furthermore, the rotor teeth have no windings and no excitation; they are only used to form a closed magnetic circuit. A shaft hole is opened inside the rotor 4, and the rotating shaft 5 is fixedly installed in the shaft hole by an interference fit for transmitting the mechanical torque of the motor.
[0026] In this embodiment, when the center line of the rotor teeth is aligned with the center line of the segmented stator 1, the motor is defined as being in an unaligned position, at which point the motor's inductance is at its minimum, i.e., the minimum inductance position. When the center line of the rotor yoke is aligned with the center line of the segmented stator 1, the motor is defined as being in an aligned position, at which point the motor's inductance is at its maximum, i.e., the maximum inductance position. When analyzing the excitation circuit, the maximum inductance position is used as an example.
[0027] See Figure 3When the permanent magnet 3 is not considered, when the windings on the two segmented stator teeth 1-2 are energized, the current I of the winding 2 on a single segmented stator 1 is greater than 0, while the current I of the remaining windings 2 is 0. The magnetic flux loop generated by winding 2 is complete, and the excitation loop path is: segmented stator teeth 1-2, air gap, rotor 4, air gap, segmented stator teeth 1-2, segmented stator yoke 1-1, segmented stator teeth 1-2, forming a closed loop.
[0028] See Figure 4 When permanent magnet 3 is energized alone and winding 2 is not energized, i.e., the current I in all windings 2 is 0, the excitation circuit generated by permanent magnet 3 only passes through the interior of segmented stator 1 and does not pass through the air gap, so no cogging torque is generated. There are three excitation circuit paths. The first excitation circuit path is: yoke permanent magnet 3-1, segmented stator yoke 1-1, yoke permanent magnet 3-1. Since segmented stator yoke 1-1 and yoke permanent magnet 3-1 are arranged alternately to form a complete arc, a closed circuit is formed. The second excitation circuit path is: toothed inter-block permanent magnet 3-2, segmented stator tooth 1-2, segmented stator yoke 1-1, segmented stator tooth 1-2, toothed inter-block permanent magnet 3-2, circulating along the circumferential direction to eventually form a closed circuit. The third excitation circuit path is: permanent magnet 3-3 inside the tooth block, segmented stator teeth 1-2, segmented stator yoke 1-1, segmented stator teeth 1-2, and permanent magnet 3-3 inside the tooth block, forming a closed loop. (Comparison) Figure 3 and Figure 4 The magnetic circuit generated when winding 2 is energized alone is opposite in direction to the magnetic circuit generated when permanent magnet 3 acts alone, such as Figure 4 The arrow on the intermediate excitation circuit is shown.
[0029] See Figure 5 When all windings 2 and all permanent magnets 3 on a single segmented stator 1 act simultaneously, four magnetic circuits can be formed on one side of the rotor in the corresponding air gap. Through the matching design of the winding polarity configuration and the magnetization direction of the permanent magnets, the magnetic field of winding 2, the magnetic field of yoke permanent magnet 3-1, and the magnetic field of tooth permanent magnet of segmented stator 1 are superimposed in four paths in one direction. This invention utilizes the synergistic effect of yoke permanent magnet 3-1, inter-tooth permanent magnet 3-2, and intra-tooth permanent magnet 3-3 of segmented stator 1 to further improve the air gap magnetic flux density and enhance the torque performance of the motor.
[0030] In summary, when winding 2 is not energized, the magnetic circuit of permanent magnet 3 only passes through the interior of segmented stator 1 and not through the air gap, thus no cogging torque is generated. When winding 2 is energized, in addition to the excitation circuit formed by winding 2, the yoke permanent magnet 3-1 between segmented stator 1 will generate an excitation circuit in the air gap. At the same time, the inter-segment permanent magnet 3-2 and the intra-segment permanent magnet 3-3 of the toothed segments of segmented stator 1 will also generate separate excitation circuits. Therefore, four excitation circuits can be generated simultaneously in the air gap.
[0031] In this invention, the number N of segmented stators 1 s With the number of poles N of rotor 4 r Satisfy the following formula:
[0032] ;
[0033] In the formula, LCM is the least common multiple function, and m is the number of phases of the permanent magnet assisted switched reluctance motor in the segmented stator yoke section.
[0034] Furthermore, the segmented stator yoke permanent magnet assisted switched reluctance motor proposed in this invention has two permanent magnet arrays in the tooth section of its segmented stator 1: an inter-block permanent magnet array 3-2 and an intra-block permanent magnet array 3-3. As an alternative technical solution, a segmented stator yoke permanent magnet assisted switched reluctance motor can still be constructed by retaining only one of the inter-block permanent magnet array 3-2 or the intra-block permanent magnet array 3-3. A segmented stator intra-block permanent magnet yoke permanent magnet assisted switched reluctance motor is shown below. Figure 6 As shown, the segmented stator block inter-segment toothed yoke permanent magnet assisted switched reluctance motor is as follows: Figure 7 As shown, the two can simultaneously generate three excitation circuits at the air gap.
[0035] The above description is merely an embodiment of the present invention and does not limit the scope of the invention. Any equivalent structural or procedural transformations made based on the description and drawings of this invention, or direct or indirect applications in other related system fields, are similarly included within the protection scope of this invention. Contents not described in detail in this specification are prior art known to those skilled in the art.
Claims
1. A segmented stator yoke permanent magnet assisted switched reluctance motor, characterized in that, include: Multiple independent segmented stators are sequentially spliced along the circumferential direction to form an annular stator core. Each segmented stator is integrally formed with a stator yoke segment extending radially inward and stator teeth. Concentrated windings are wound on the stator teeth. The segmented stator is π-shaped and includes a stator yoke segment and two stator teeth symmetrically connected to the stator yoke segment. The permanent magnet includes a yoke permanent magnet array, a tooth block inter-block permanent magnet array, and a tooth block intra-block permanent magnet array; the yoke permanent magnet array is installed at the yoke extension of adjacent segmented stators, the tooth block inter-block permanent magnet array is installed between adjacent stator teeth of adjacent segmented stators, and the tooth block intra-block permanent magnet array is installed between two stator teeth of each segmented stator. The rotor is coaxially mounted on the inner side of the segmented stator, with an air gap between it and the segmented stator, and can rotate relative to it. The rotor adopts a salient pole rotor structure. The rotating shaft is coaxially connected to the rotor.
2. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 1, characterized in that, The permanent magnet array in the yoke is tangentially magnetized in a clockwise direction, the permanent magnet array between the tooth blocks is tangentially magnetized in a clockwise direction, and the permanent magnet array inside the tooth blocks is tangentially magnetized in a counterclockwise direction.
3. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 1, characterized in that, The concentrated windings on two adjacent stator teeth are configured to generate magnetic flux in opposite directions during excitation, in order to construct a closed magnetic circuit.
4. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 1, characterized in that, When permanent magnets are not considered, the excitation circuit path when the windings on the two segmented stator teeth are energized is: segmented stator teeth, air gap, rotor, air gap, segmented stator teeth, segmented stator yoke, segmented stator teeth, forming a closed loop.
5. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 1, characterized in that, When the permanent magnet is energized alone and the winding is not energized, the excitation circuit generated by the permanent magnet only passes through the interior of the segmented stator, does not pass through the air gap, and does not generate cogging torque.
6. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 5, characterized in that, When the permanent magnet is energized alone and the winding is not energized, the three excitation circuit paths are as follows: The first excitation circuit path is: yoke permanent magnet, segmented stator yoke, yoke permanent magnet, forming a closed circuit; the second circuit path is: tooth segment permanent magnet, segmented stator tooth, segmented stator yoke, segmented stator tooth, tooth segment permanent magnet, circulating in the circumferential direction to eventually form a closed circuit; the third excitation circuit path is: tooth segment permanent magnet, segmented stator tooth, segmented stator yoke, segmented stator tooth, tooth segment permanent magnet, tooth segment permanent magnet, forming a closed circuit.
7. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 1, characterized in that, The rotor has a shaft hole inside, and the shaft is fixedly installed in the shaft hole by interference fit to transmit the mechanical torque of the motor.
8. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 1, characterized in that, The permanent magnet array within the toothed block is retained, but the permanent magnet array between the toothed blocks is not set.
9. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 1, characterized in that, The permanent magnet array between the tooth blocks is retained, but the permanent magnet array within the tooth blocks is not set.
10. The segmented stator yoke permanent magnet assisted switched reluctance motor according to claim 1, characterized in that, The number of segmented stators N s With the number of poles N of the rotor r satisfy: ； Where LCM is the least common multiple function, and m is the number of phases of the permanent magnet assisted switched reluctance motor in the segmented stator yoke section.