Stator lamination, stator core, stator assembly and limited angle torque motor

Abstract

The invention discloses a stator lamination, a stator core, a stator assembly and a limited angle torque motor. Comprising a stator yoke (1), more than one stator tooth (2) is arranged on the inner wall of the stator yoke (1) along the circumferential direction at equal angles, and two adjacent stator teeth (2) and the inner wall of the stator yoke (1) jointly define a stator slot (3); the stator teeth (2) comprise straight tooth parts (21), the outer ends of the straight tooth parts (21) are connected with the inner wall of the stator yoke (1), the inner ends of the straight tooth parts (21) are connected with the waist parts of the outer walls of the tooth boots (22), two opposite end surfaces of two adjacent tooth boots (22) form wedge-shaped notches (23), the outer sides of the notches (23) are large-opening sides, and the inner sides of the notches (23) are small-opening sides. The notch armature reaction of the limited angle torque motor can be effectively inhibited, the problems that a traditional parallel notch structure is prone to saturation and large in magnetic leakage are solved, and the torque characteristic of the limited angle motor is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and particularly relates to a high linear speed high-temperature-resistant combined semi-open type compressor impeller. BACKGROUND

[0002] The limited angle torque motor is a motor which can rotate or reciprocate around the axis within a certain angle without other mechanical devices. It is often used as an electric actuator and applied to electric direct drive within a limited angle. Compared with the traditional hydraulic and pneumatic actuators, the limited angle torque motor does not need pipes and other equipment and can be driven by wire control. Compared with the electric actuator based on the motor with a reduction gear box, the limited angle torque motor has no mechanical nonlinearity and can be used for precise positioning. The limited angle torque motor based on various working principles has been rapidly developed due to its simple structure, convenient control, high reliability and large torque density, and is widely used in the fields of valves, magnetic disk storage, satellite remote sensing, antenna positioning, rudders, high-voltage circuit breakers, medical machinery, resistance umbrella locks and high-speed scanning galvanometers. However, the torque characteristics of the current motor structure are not ideal when the armature current increases. SUMMARY

[0003] The application aims to provide a stator lamination, a stator core, a stator assembly and a limited angle torque motor. The application can effectively suppress the slot armature reaction of the limited angle torque motor, overcome the problems of easy saturation and large magnetic leakage of the traditional parallel slot structure, and improve the torque characteristics of the limited angle motor.

[0004] The technical solution of the application is as follows: a stator lamination for a limited angle torque motor, comprising a stator yoke, the inner wall of the stator yoke has more than one stator tooth at equal angles in the circumferential direction, and the adjacent two stator teeth and the inner wall of the stator yoke jointly form a stator slot; the stator tooth comprises a straight tooth part, the outer end of the straight tooth part is connected with the inner wall of the stator yoke, the inner end of the straight tooth part is connected with the waist part of the outer wall of the tooth shoe, the opposite end faces of the adjacent two tooth shoes form a wedge-shaped slot, the outer side of the slot is the large opening side, and the inner side is the small opening side.

[0005] In the foregoing stator lamination, the end faces of the tooth shoes are parallel to the axis of the straight tooth part.

[0006] In the foregoing stator lamination, the two end faces of the tooth shoes are symmetrical about the axis of the straight tooth part.

[0007] In the foregoing stator lamination, the number of stator teeth is four, which are distributed at four equal points of the stator yoke.

[0008] In the foregoing stator lamination, the stator lamination is composed of 1J22 material.

[0009] A stator core composed of the foregoing stator lamination is formed by stacking one or more stator laminations in the axial direction.

[0010] A stator assembly composed of the aforementioned stator core, the straight tooth portions being wound with winding coils, and the winding coils being accommodated by the stator slots.

[0011] In the aforementioned stator assembly, among the four straight tooth portions, the winding coils wound on the two oppositely arranged straight tooth portions are connected to form one channel coil, and the two channel coils are electromagnetically isolated by an insulating material.

[0012] A limited rotation torque motor composed of the aforementioned stator assembly, the inner walls of the shoes surrounding a stator inner cavity at the center of the stator yoke, and a rotor assembly being installed in the stator inner cavity, the rotor assembly including a rotor installed in the stator inner cavity and a permanent magnet attached to the outer wall of the rotor.

[0013] In the limited rotation torque motor composed of the aforementioned stator assembly, the rotor assembly can freely rotate within a limited rotation range of -30° to 30° in the stator inner cavity.

[0014] Beneficial effects: The present application proposes a tooth structure design for improving the torque characteristics of a limited rotation torque motor. Experimental results show that the design of the wedge-shaped slot has more significant advantages in torque performance.

[0015] Through a large number of research and analysis by the inventor, it is found that the poor torque characteristics of the traditional limited rotation torque motor when the armature current increases are due to the fact that in the limited rotation torque motor, a large part of the armature flux will pass through the stator yoke, the straight tooth portion, the shoe, and the shoe end face, and finally pass through the slot closure (i.e. Figure 3 、 Figure 4 The leakage flux in the traditional limited rotation torque motor slot is parallel (see Figure 1 ), the slot width b is small, and the corresponding equivalent magnetic resistance is also small; therefore, when the armature current increases, the armature reaction is obvious, and the slot portion will easily appear a serious magnetic circuit saturation phenomenon, resulting in a large leakage flux, which further affects the torque characteristics of the motor.

[0016] In order to overcome the above technical problems, the inventor increases the length a of the shoe end face (see Figure 3 and Figure 4 for comparison), and then makes the opposite two end faces of the adjacent two shoes form a wedge-shaped slot (see Figure 2 ), to replace the traditional parallel slot, and the small side width of the wedge-shaped slot is still b; through this structure, the equivalent width of the wedge-shaped slot is greater than the width b of the parallel slot, thereby increasing the equivalent magnetic resistance of the leakage flux; and the magnetic flux density always closes along the path with the smallest magnetic resistance, so this structure makes the armature flux more easily pass through the main flux, reduces the saturation degree of the leakage flux, and thus the leakage degree of the wedge-shaped slot is significantly smaller than that of the conventional parallel slot, finally the torque characteristics of the limited rotation torque motor are significantly improved.

[0017] Conventional stator-slotted motors typically reduce the stator slot torque amplitude by increasing the number of stator slots, but this requires increasing the number of rotor poles, leading to a reduction in the motor's constant torque range. Furthermore, a single electromagnetic torque cycle contains multiple stator slot torque cycles, resulting in significant torque fluctuations within the constant torque range. Figure 5 To achieve the desired smooth torque output within the operating angle range, this invention designs a concentrated winding structure, connecting the winding coils (4) wound on two relatively arranged straight tooth sections (21) to form a single channel coil. This results in high motor torque output capability, high coil utilization, and simple winding process. Furthermore, there is only one stator slot torque cycle in one electromagnetic torque cycle, and the stator slot torque amplitude has virtually no impact on the constant torque range. Figure 6 Furthermore, compared with the conventional stator slot structure, the stator slot area of ​​the motor of the present invention has a larger utilization rate, and the winding coefficient is higher than that of the distributed winding. Therefore, under the condition of the same motor volume, it has a higher power density, the winding is easier to unwind, and the end length of the winding is shorter than that of the conventional stator slot structure, thereby reducing the winding copper loss.

[0018] In traditional parallel-slot finite-angle torque motors, armature reaction is significant. The wedge-shaped slot of this invention effectively improves the torque characteristics of the finite-angle torque motor. The wedge-shaped slot effectively suppresses armature reaction and avoids oversaturation at the slot, thereby optimizing the motor's torque performance. Experimental studies by the inventors show that after optimization using this invention, the torque performance of the finite-angle torque motor is improved by 60% compared to before optimization. Attached Figure Description

[0019] Figure 1 A schematic diagram of the parallel slot structure of a traditional finite angle torque motor; Figure 2 This is a schematic diagram of the wedge-shaped slot structure of the finite angle torque motor of the present invention; Figure 3 This is a schematic diagram of the magnetic circuit of a traditional finite-angle torque motor. Figure 4 This is a schematic diagram of the magnetic circuit of the finite angle torque motor of the present invention; Figure 5 The torque curve of a conventional slotted motor within the constant torque range; Figure 6 This is the torque curve of the motor of the present invention within the constant torque range. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0022] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example 1. A stator lamination for a finite-angle torque motor, see [reference needed]. Figure 2 The stator includes a stator yoke 1, and the inner wall of the stator yoke 1 has one or more stator teeth 2 at equal angles along the circumference. Two adjacent stator teeth 2 and the inner wall of the stator yoke 1 together form a stator groove 3. The stator teeth 2 include straight tooth portions 21, the outer end of which is connected to the inner wall of the stator yoke 1, and the inner end of which is connected to the waist of the outer wall of the toothed shoe 22. The two opposite end faces of two adjacent toothed shoes 22 form a wedge-shaped groove 23, with the outer side of the groove 23 being the large opening side and the inner side being the small opening side.

[0024] The end face of the aforementioned toothed shoe 22 is parallel to the central axis 24 of the straight tooth section.

[0025] The two end faces of the aforementioned toothed shoe 22 are symmetrical about the central axis 24 of the straight tooth section.

[0026] The aforementioned stator teeth 2 number 4, which are distributed at 4 equal points on the stator yoke 1.

[0027] The aforementioned stator laminations are made of 1J22 material.

[0028] A stator core composed of the aforementioned stator laminations is formed by stacking one or more stator laminations sequentially along their axial direction.

[0029] A stator assembly consisting of the aforementioned stator core, wherein a winding coil 4 is wound on the straight tooth portion 21 and the wound winding coil 4 is accommodated by a stator slot 3.

[0030] Of the four straight tooth sections 21, the winding coils 4 wound on the two oppositely arranged straight tooth sections 21 are connected to form a channel coil. The two channel coils are electromagnetically and thermally isolated by insulating material.

[0031] A limited torque motor composed of the aforementioned stator assembly, wherein the inner walls of each tooth shoe 22 form a stator cavity 5 at the center of the stator yoke 1, and a rotor assembly 6 is installed in the stator cavity 5. The rotor assembly 6 includes a rotor 61 installed in the stator cavity 5 and a permanent magnet 62 attached to the outer wall of the rotor 61.

[0032] The aforementioned rotor assembly 6 can rotate freely within a limited angle range of -30° to 30° in the stator cavity 5; the limited angle torque motor is a 4-pole 4-slot motor design.

[0033] By comparison Figure 3 and Figure 4 It has been found that the wedge-shaped slot of the present invention has a larger equivalent slot opening width, which makes the equivalent magnetic reluctance at the wedge-shaped slot greater than that of the conventional parallel slot. Since the magnetic flux density always closes along the path of least magnetic reluctance, the armature flux linkage of this wedge-shaped slot is more likely to pass through the main flux linkage. This makes the saturation of the leakage flux linkage decrease. Therefore, the degree of magnetic leakage near the wedge-shaped slot is significantly less than that of the conventional parallel slot, and the torque characteristics of the wedge-shaped slot limited angle torque motor are significantly improved.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A stator lamination for a finite-angle torque motor, characterized in that, It includes a stator yoke (1), and the inner wall of the stator yoke (1) has one or more stator teeth (2) at equal angles along the circumference. Two adjacent stator teeth (2) together with the inner wall of the stator yoke (1) form a stator groove (3). The stator teeth (2) include straight teeth (21), the outer end of the straight teeth (21) is connected to the inner wall of the stator yoke (1), the inner end of the straight teeth (21) is connected to the waist of the outer wall of the toothed shoe (22), and the two opposite end faces of two adjacent toothed shoes (22) form a wedge-shaped groove (23). The outer side of the groove (23) is the large opening side, and the inner side is the small opening side.

2. The stator lamination according to claim 1, characterized in that, The end face of the toothed shoe (22) is parallel to the central axis (24) of the straight tooth section.

3. The stator lamination according to claim 1, characterized in that, The two end faces of the toothed shoe (22) are symmetrical about the central axis (24) of the straight tooth section.

4. The stator lamination according to claim 1, characterized in that, There are 4 stator teeth (2), which are distributed at 4 equal points on the stator yoke (1).

5. The stator lamination according to claim 1, characterized in that, The stator laminations are made of 1J22 material.

6. A stator core composed of stator laminations as described in any one of claims 1-5, characterized in that, It is formed by stacking one or more stator laminations sequentially along their axial direction.

7. A stator assembly comprising the stator core as described in claim 6, characterized in that, The straight tooth section (21) is wound with a winding coil (4), and the wound winding coil (4) is accommodated by the stator slot (3).

8. The stator assembly according to claim 7, characterized in that, In the four straight tooth sections (21), the winding coils (4) wound on the two opposite straight tooth sections (21) are connected to form a channel coil.

9. A finite-angle torque motor composed of the stator assembly as described in claim 7 or 8, characterized in that, The inner walls of each toothed shoe (22) form a stator cavity (5) at the center of the stator yoke (1). A rotor assembly (6) is installed in the stator cavity (5). The rotor assembly (6) includes a rotor (61) installed in the stator cavity (5) and a permanent magnet (62) attached to the outer wall of the rotor (61).

10. The finite-angle torque motor composed of the stator assembly according to claim 9, characterized in that, The rotor assembly (6) can rotate freely within a limited angular range of -30° to 30° in the stator cavity (5).

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