A magnetic reluctance resolver

Abstract

The application relates to the technical field of rotary transformers, and discloses a reluctance type rotary transformer which comprises a stator and a rotor, the rotor is matched with the stator in the structural form of a reluctance motor, the inner side of the stator is uniformly distributed with a plurality of stator teeth, the cross section of the stator teeth is H-shaped, the two ends of the stator teeth are respectively formed with an outer opening part and an inner opening part, the inner opening part and the outer opening part are sequentially arranged along the radial direction of the rotor, excitation input lines, sine signal lines and cosine signal lines are wound on the stator in a set form, the current directions of the winding sections in the two adjacent outer opening parts are opposite, the current directions of the winding sections in the two adjacent inner opening parts are opposite, and the current directions of the winding sections in the outer opening part and the inner opening part on the same stator tooth are opposite, so that two groups of bipolar orthogonal signal outputs can be naturally formed; the reluctance type rotary transformer can obviously simplify the structure, improve the space utilization, reduce the precision machining requirement and manufacturing cost, and effectively improve the output signal quality.

Description

Technical Field

[0001] This invention relates to the field of rotary transformer technology, specifically to a reluctance rotary transformer. Background Technology

[0002] A rotary transformer is a precision electromagnetic induction position sensor used to detect the number of rotations, angle, and rotational speed of rotating parts. It can maintain high-precision position information transmission even under harsh environmental conditions such as high temperature and dust, and therefore occupies an important position in the aerospace, transportation, and CNC machine tool automation equipment industries.

[0003] Currently, widely used rotary transformers are mainly divided into two categories: wound-rotor rotary transformers and reluctance rotary transformers. The complex winding process of existing wound-rotor rotary transformers significantly increases manufacturing costs and difficulty. In existing reluctance rotary transformers, the excitation winding and signal winding are arranged coaxially. During operation, at the same stator tooth position, the change in the air gap between the rotor salient pole and the stator tooth during rotor rotation causes a change in the magnitude of the induced electromotive force (EMF) in the signal winding. The direction of the induced EMF does not change, and the output signal of the signal winding is a unipolar signal. To achieve a sinusoidal signal output, existing reluctance rotary transformers must have a rotor surface shape with a sine and cosine profile to achieve a sinusoidal change in the induced EMF with DC bias. Then, a reverse winding is used to create a difference to cancel the DC component and achieve a bipolar change in the output signal. This makes the rotor structure precise and complex, not only increasing manufacturing difficulty and cost but also failing to achieve an optimal layout in the radial or circumferential space of the reluctance rotary transformer, limiting the possibility of achieving equivalent performance in a smaller space. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a reluctance rotary transformer that can significantly simplify the structure, improve space utilization, reduce precision machining requirements and manufacturing costs, and effectively improve the quality of the output signal.

[0005] The objective of this invention is achieved through the following technical solution: A reluctance rotary transformer includes a stator and a rotor. The rotor is coaxially disposed within the stator. A plurality of stator teeth are evenly distributed along the inner circumference of the stator, and a plurality of salient poles are evenly distributed along the outer circumference of the rotor. The rotor and stator are adapted to the structure of a reluctance motor. The stator teeth have an H-shaped cross-section, with an outer opening and an inner opening at each end. The inner and outer openings are sequentially arranged along the radial direction of the rotor. An excitation winding is wound within the stator teeth, with the axis of the excitation winding parallel to the tangent direction of the rotor. Adjacent stator teeth... The excitation windings on the stator teeth are wound in opposite directions, and the excitation windings on each stator tooth are connected in series. A signal winding is wound on the outer side of the stator tooth, and the axis of the signal winding is arranged along the radial direction of the rotor. The signal windings on several stator teeth are equally divided into several sine windings and several cosine windings. The sine windings and cosine windings are arranged alternately along the circumferential direction of the stator. The winding directions of two adjacent sine windings are opposite, and several sine windings are connected in series. The winding directions of two adjacent cosine windings are opposite, and several cosine windings are connected in series. In the reluctance rotary transformer, by orthogonally arranging the excitation winding and signal winding on each stator tooth, the current directions of the winding segments in two adjacent outer openings are opposite, the current directions of the winding segments in two adjacent inner openings are opposite, and the current directions of the inner winding segments in the outer openings and inner openings on the same stator tooth are opposite. In addition, due to the salient pole modulation effect under the reluctance motor structure, the windings on any two adjacent stator teeth are 90 electrical degrees out of phase. As the relative positions of the stator teeth and rotor salient poles change, two sets of bipolar orthogonal signal outputs can be naturally formed.

[0006] Specifically, there are ten salient poles and eight stator teeth. The eight stator teeth are named sequentially according to their circumferential arrangement: first tooth, second tooth, third tooth, fourth tooth, fifth tooth, sixth tooth, seventh tooth, and eighth tooth. The excitation windings in the first, third, fifth, and seventh teeth are wound in the forward direction, while the excitation windings in the second, fourth, sixth, and eighth teeth are wound in the reverse direction. The outer sides of the first and fifth teeth are wound with sine windings in the forward direction, the outer sides of the third and seventh teeth are wound with sine windings in the reverse direction, the outer sides of the second and sixth teeth are wound with cosine windings in the reverse direction, and the outer sides of the fourth and eighth teeth are wound with cosine windings in the forward direction.

[0007] Specifically, insulating elements are provided at both ends of the stator. The insulating elements include several U-shaped pieces evenly distributed around the circumference. The shape of the insulating elements is adapted to the cross-sectional shape of the stator. The insulating elements are used to form protrusions on both sides of the stator teeth to separate the signal winding from the excitation winding.

[0008] A reluctance rotary transformer includes a stator and a rotor. The rotor is coaxially disposed within the stator. A plurality of stator teeth are evenly distributed along the inner circumference of the stator, and a plurality of salient poles are evenly distributed along the outer circumference of the rotor. The rotor and stator are adapted to the structure of a reluctance motor. The stator teeth have an H-shaped cross-section, with an outer opening and an inner opening formed at both ends. The inner and outer openings are sequentially arranged along the radial direction of the rotor. Each pair of adjacent stator teeth constitutes a winding unit. An outer cross-winding region is formed between the two outer openings in the winding unit, and an inner cross-winding region is formed between the two inner openings in the winding unit. Excitation windings are wound in all winding areas. The excitation windings in the outer winding areas are wound in the same direction, while the excitation windings in the inner winding areas are wound in the opposite direction to those in the outer winding areas. The excitation windings are connected in series. Signal windings are wound on the outside of the stator teeth. The axis of the signal windings is arranged along the radial direction of the rotor. The signal windings on several stator teeth are equally divided into several sine windings and several cosine windings. The sine windings and cosine windings are arranged alternately. The winding directions of two adjacent sine windings are opposite. The sine windings are connected in series. The winding directions of two adjacent cosine windings are opposite. The cosine windings are connected in series. In the reluctance rotary transformer, by winding the excitation winding and the signal winding in layers in each cross-winding section, the current directions of the winding segments in two adjacent outer openings are opposite, the current directions of the winding segments in two adjacent inner openings are opposite, and the current directions of the inner winding segments in the outer openings and the inner winding segments in the inner openings on the same stator tooth are opposite. In addition, due to the salient pole modulation effect under the reluctance motor structure, the windings on any two adjacent stator teeth are 90 electrical degrees out of phase. As the relative positions of the stator teeth and rotor salient poles change, two sets of bipolar orthogonal signal outputs can be naturally formed.

[0009] Specifically, there are ten salient poles and eight stator teeth. These eight stator teeth are sequentially named as tooth 1, tooth 2, tooth 3, tooth 4, tooth 5, tooth 6, tooth 7, and tooth 8 according to their circumferential arrangement. The excitation windings are wound in a positive spiral direction between the outer openings of the first and second teeth, the third and fourth teeth, the fifth and sixth teeth, and the seventh and eighth teeth. The inner openings of the first and second teeth are also connected. The excitation windings are wound in the opposite direction between the openings, between the inner openings of the third and fourth teeth, between the inner openings of the fifth and sixth teeth, and between the inner openings of the seventh and eighth teeth. The sine windings are wound in the forward direction on the outer sides of the first and fifth teeth, the sine windings are wound in the opposite direction on the outer sides of the third and seventh teeth, the cosine windings are wound in the opposite direction on the outer sides of the second and sixth teeth, and the cosine windings are wound in the forward direction on the outer sides of the fourth and eighth teeth.

[0010] Furthermore, the reluctance rotary transformer also includes a housing and a rotor shaft. The stator and rotor are both disposed inside the housing. The stator is fixedly connected to the housing, and the rotor is fixedly sleeved on the rotor shaft. The rotor shaft is rotatably connected to the housing, and one end of the rotor shaft extends out of the housing.

[0011] Furthermore, an oil distributor is provided at the top center of the housing. The oil distributor includes an oil inlet and several oil distribution ports, all of which are connected to the oil inlet. The oil inlet is located outside the housing, and the oil distribution ports are located inside the housing. Several oil drain ports are also provided at the bottom of the housing.

[0012] The beneficial effects of this invention are: The base structure of this reluctance rotary transformer is configured according to the structure of a reluctance motor, including a stator and a rotor. The rotor is coaxially mounted inside the stator. Several stator teeth are evenly distributed on the inner circumference of the stator, and several salient poles are evenly distributed on the outer circumference of the rotor. The rotor and stator are adapted to the structure of a reluctance motor. The stator teeth have an H-shaped cross-section, with an outer opening and an inner opening at each end. The inner and outer openings are arranged sequentially along the radial direction of the rotor. In this base structure, adjacent stator teeth are directly 90 electrical degrees apart. The excitation input line, sine signal line, and cosine signal line are all wound on the stator in a predetermined manner. After winding, the current directions of the winding segments in adjacent outer openings are opposite, the current directions of the winding segments in adjacent inner openings are opposite, and the current directions of the inner winding segments in the outer and inner openings on the same stator tooth are opposite. When the excitation input line is energized, as the rotor rotates, both the sine and cosine signal lines can output natural bipolar signals. When a high-frequency alternating current is applied to the excitation input line, as the rotor position changes, the sine and cosine signal lines can be induced into a sinusoidal output signal with a sine wave envelope according to a certain proportional relationship. In addition, the 90-degree electrical angle difference between two adjacent stator teeth (i.e., the adjacent sine and cosine windings of the sine and cosine signal lines are 90 degrees electrical angle apart during winding) allows the sine and cosine signal lines to naturally form two sets of bipolar orthogonal signals, which meets the functional principle requirements of the rotary transformer.

[0013] Compared to traditional rotary transformers, this reluctance rotary transformer simplifies the structure by eliminating the need for precise manufacturing of sine and cosine contours. Furthermore, the winding process for each excitation winding, sine winding, and cosine winding is extremely convenient, significantly reducing the precision requirements and manufacturing costs of the rotary transformer. This facilitates mass production of automated equipment. The compact overall structure of this reluctance rotary transformer improves space utilization, making it suitable for use in smaller spaces compared to traditional rotary transformers. Simultaneously, the output signal of this reluctance rotary transformer is not constrained by the precision of the sine and cosine contours, effectively improving output signal quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the stator and rotor in a reluctance rotary transformer according to the present invention; Figure 2 This is a schematic diagram of the structure of a reluctance rotary transformer according to Embodiment 1 of the present invention; Figure 3 for Figure 2 The split structure view of Embodiment 1 shown; Figure 4 This is a schematic diagram illustrating the principle of a reluctance rotary transformer according to the present invention. Figure 5 This is a schematic diagram of the structure of a second embodiment of a reluctance rotary transformer according to the present invention; Figure 6 for Figure 5 A schematic diagram of the split structure of Embodiment 2 is shown; Figure 7 for Figure 2 The diagram shown is a structural schematic of Embodiment 1 when it is installed inside the casing; In the diagram, 1-rotor, 2-stator, 3-excitation winding, 4-sine winding, 5-cosine winding, 6-stator tooth, 7-salient pole, 8-outer opening, 9-inner opening, 10-insulator, 11-rotor shaft, 12-casing, 13-oil distributor, 14-oil inlet, 15-oil distributor port, 16-oil outlet. Detailed Implementation

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0016] like Figures 1 to 7 As shown, a reluctance rotary transformer includes a rotor 1, a stator 2, several excitation windings 3, several sine windings 4, and several cosine windings 5. The rotor 1 and stator 2 form the basic structure of this reluctance rotary transformer, specifically as follows... Figure 1 As shown, rotor 1 is coaxially mounted inside stator 2. Several stator teeth 6 are evenly distributed around the inner circumference of stator 2, and several salient poles 7 are evenly distributed around the outer circumference of rotor 1. Rotor 1 and stator 2 are adapted to the structure of a reluctance motor. The outer contour of rotor 1 does not need to be precisely machined according to a sine or cosine contour, which helps reduce manufacturing difficulty and processing costs. The cross-section of stator teeth 6 is H-shaped, with an outer opening 8 and an inner opening 9 formed at both ends of stator teeth 6, respectively. The inner opening 9 and the outer opening 8 are arranged sequentially along the radial direction of rotor 1. Several excitation windings 3, several sine windings 4, and several cosine windings 5 ​​are all mounted on stator 2, and their winding methods have the following two implementation forms.

[0017] Example 1: like Figures 1 to 3As shown, an excitation winding 3 is wound in each stator tooth 6. The axis of the excitation winding 3 is parallel to the tangent direction of the rotor 1. The winding directions of the excitation winding 3 on two adjacent stator teeth 6 are opposite, and the excitation windings 3 on each stator tooth 6 are connected in series. When winding the excitation winding 3, it can be wound sequentially on each stator tooth 6 using a single excitation input line. Since the stator tooth 6 itself is machined into an H-shape, the excitation winding 3 is a simple tooth winding form within the stator tooth 6, and its winding process is easy, which is beneficial for automated production equipment. Signal windings are wound around the outside of each stator tooth 6. The axis of the signal windings is set along the radial direction of the rotor 1. The signal windings on these stator teeth 6 are divided into several sine windings 4 and several cosine windings 5 ​​according to the different output signal lines. The sine windings 4 and cosine windings 5 ​​are arranged alternately along the circumferential direction of the stator 2. The winding directions of two adjacent sine windings 4 are opposite. Several sine windings 4 are connected in series in sequence. The winding directions of two adjacent cosine windings 5 ​​are opposite. Several cosine windings 5 ​​are connected in series in sequence. The signal windings are wound around the stator teeth 6. It is also a simple winding form. After the winding of the excitation winding 3 is completed, the winding of the signal windings can be easily completed by automated production equipment.

[0018] As a specific implementation structure, there are ten salient poles 7 and eight stator teeth 6. The eight stator teeth 6 are named sequentially according to their circumferential arrangement: first tooth, second tooth, third tooth, fourth tooth, fifth tooth, sixth tooth, seventh tooth, and eighth tooth. The excitation windings 3 within the first, third, fifth, and seventh teeth are wound in the forward direction, while those within the second, fourth, sixth, and eighth teeth are wound in the reverse direction. Sine windings 4 are wound in the forward direction on the outer sides of the first and fifth teeth, and in the reverse direction on the outer sides of the third and seventh teeth. During winding, a single sine signal line can be used to complete the winding sequentially on the first, third, fifth, and seventh teeth. Cosine windings 5 ​​are wound in the reverse direction on the outer sides of the second and sixth teeth, and in the forward direction on the outer sides of the fourth and eighth teeth. During winding, a single cosine signal line can be used to complete the winding sequentially on the second, fourth, sixth, and eighth teeth.

[0019] In this embodiment, the excitation winding 3 is arranged orthogonally to the signal winding, the principle of which can be found in [reference needed]. Figure 4 As shown. Figure 4The diagrams in states A and B illustrate the changes in induced electromotive force (EMF) in the same signal winding (taking the sinusoidal winding 4 as an example) when DC current is applied to the excitation input line. In state A, the two salient poles 7 are located to the left of the two stator teeth 6, and the left excitation winding 3 acts as the primary winding. In state B, the two salient poles 7 are located to the right of the two stator teeth 6, and the right excitation winding 3 acts as the primary winding. Since the winding directions of the excitation windings 3 on the two stator teeth 6 are opposite, the current directions on these two excitation windings 3 are opposite after the excitation input line is energized. Therefore, the induced EMF of the sinusoidal winding 4 in states A and B are opposite.

[0020] It should be understood that Figure 4 Although the diagram shows a linearized representation of the stator 2 and rotor 1, it demonstrates that the direction of the induced electromotive force (EMF) in the same signal winding changes during the movement of the two salient poles 7 relative to the two stator teeth 6. In this embodiment, when DC current is applied to the excitation input line, the direction of the induced EMF in the signal winding on each stator tooth 6 is determined by the relative position of the stator tooth 6 and the salient pole 7. When the relative position of the stator tooth 6 and the salient pole 7 changes, the induced EMF in the signal winding exhibits alternating positive and negative changes, resulting in a natural bipolar signal output. Assuming the rotor 1 and stator 2 are matched according to the reluctance motor structure, a sinusoidal signal output can be achieved by superposition based on distributed winding theory, without the need for precise machining of sine and cosine contours.

[0021] Taking the above specific implementation structure as an example, among the four sinusoidal windings 4 belonging to the same sinusoidal signal line, the winding directions of adjacent sinusoidal windings 4 are opposite. When a fixed DC current is applied to the excitation input line, the signal of the excitation winding 3 can be alternately induced into a bipolar changing signal output by the sinusoidal signal line. When the current applied to the excitation input line changes, the output signal also changes superimposed with the change of the input current. When a high-frequency AC current is applied to the excitation input line, as the position of the rotor 1 changes, a sinusoidal output signal with a sine wave envelope can be induced according to a certain proportional relationship and output by the sinusoidal signal line. Similarly, the winding directions of adjacent cosine windings 5 ​​belonging to the same cosine signal line are opposite. When a high-frequency AC current is applied to the excitation input line, as the position of the rotor 1 changes, a sinusoidal output signal with a sine wave envelope can also be induced according to a certain proportional relationship and output by the cosine signal line. In this specific implementation structure, there are ten salient poles 7 (i.e., ten pole pairs) and eight stator teeth 6. According to the formula for calculating the electrical angle occupied by each tooth of a reluctance motor (electrical angle occupied by each tooth = number of pole pairs * 360° / number of stator teeth), it can be calculated that each stator tooth 6 occupies an electrical angle of 450°. Therefore, the interval between adjacent stator teeth 6 is 90 electrical angles, meaning that adjacent signal windings (between the alternating sine winding 4 and cosine winding 5) are directly 90 electrical angles apart. Thus, through the reluctance motor structure, the magnetic field of the excitation winding 3 is modulated by double salient poles without requiring a specific sine / cosine shape design; the sine and cosine signal lines can naturally form two sets of bipolar orthogonal signals.

[0022] As described above, in this reluctance rotary transformer, the base structure is fabricated according to the structure of a reluctance motor. Excitation windings 3 and signal windings (sine windings 4 or cosine windings 5) are wound orthogonally on each stator tooth 6. When a high-frequency alternating current is applied to the excitation input line, two sets of bipolar orthogonal signals can be directly output when the rotor 1 rotates, satisfying the functional requirements of the rotary transformer. Compared to traditional rotary transformers, the base structure of this reluctance rotary transformer does not require precise manufacturing of sine and cosine contours, resulting in a simpler structure. Furthermore, the winding process of each excitation winding 3, sine winding 4, and cosine winding 5 is extremely convenient, significantly reducing the precision requirements and manufacturing costs of the rotary transformer, which is beneficial for mass production of automated equipment. The overall structure of this reluctance rotary transformer is compact, which helps improve space utilization and allows it to be used in smaller spaces compared to traditional rotary transformers. At the same time, the output signal of this reluctance rotary transformer is not constrained by the precision of the sine and cosine contours, effectively improving the output signal quality.

[0023] In specific implementation, such as Figures 1 to 3As shown, an insulating element 10 is also provided at both ends of the stator 2 in Embodiment 1. The insulating element 10 includes several U-shaped pieces evenly distributed around the circumference. The shape of the insulating element 10 is adapted to the cross-sectional shape of the stator 2. The insulating element 10 is used to form protrusions on both sides of the stator teeth 6. When winding the signal winding, it is beneficial to separate the signal winding from the excitation winding 3 and avoid the signal winding and the excitation winding 3 from each other.

[0024] Example 2: like Figure 1 , Figure 5 , Figure 6 As shown, a signal winding is wound on the outer side of the stator teeth 6, and the winding method of the signal winding is exactly the same as in Embodiment 1. In a plurality of stator teeth 6, each pair of adjacent stator teeth 6 constitutes a winding unit. An outer cross-winding region is formed between the two outer openings 8 in this winding unit, and an inner cross-winding region is formed between the two inner openings 9 in this winding unit. The same excitation input line is used to wind the windings sequentially in each outer and inner cross-winding region. Specifically, during winding, an excitation winding 3 is wound in both the outer and inner cross-winding regions. The winding direction of the excitation winding 3 in each outer cross-winding region is the same, while the winding direction of the excitation winding 3 in the inner cross-winding region is opposite to that in the outer cross-winding region. Through this winding method, when the excitation input line is energized, the current direction of the winding segments in adjacent outer openings 8 is opposite, the current direction of the winding segments in adjacent inner openings 9 is opposite, and the current direction of the winding segments located between the outer openings 8 and inner openings 9 of the same stator tooth 6 is opposite.

[0025] As a specific implementation structure, there are eight stator teeth 6 in total. The eight stator teeth 6 are named sequentially according to their circumferential arrangement as the first tooth, the second tooth, the third tooth, the fourth tooth, the fifth tooth, the sixth tooth, the seventh tooth, and the eighth tooth. Excitation windings 3 are wound in the forward direction between the outer openings 8 of the first tooth and the second tooth, the third tooth and the fourth tooth, the fifth tooth and the sixth tooth, and the seventh tooth and the eighth tooth. Excitation windings 3 are wound in the reverse direction between the inner openings 9 of the first tooth and the second tooth, the third tooth and the fourth tooth, the fifth tooth and the sixth tooth, and the seventh tooth and the eighth tooth. The outer sides of the first and fifth teeth are wound with sine windings 4 in the forward direction, the outer sides of the third and seventh teeth are wound with sine windings 4 in the reverse direction, the outer sides of the second and sixth teeth are wound with cosine windings 5 ​​in the reverse direction, and the outer sides of the fourth and eighth teeth are wound with cosine windings 5 ​​in the forward direction.

[0026] If Embodiment 2 is cut open perpendicular to the axis of rotor 1, it can be seen that the current direction at each local position of the excitation input line in the cross-sectional view of Embodiment 2 is exactly the same as that in Embodiment 1. In addition, the winding method of the signal winding in Embodiment 2 is exactly the same as that in Embodiment 1. It can be seen that the principles of Embodiment 2 and Embodiment 1 are completely the same, and will not be elaborated further here. The only difference between Embodiment 2 and Embodiment 1 is the winding method of the excitation input line. When winding the excitation winding 3 in the outer and inner cross-winding areas, it is still a simple cross-tooth winding form, which is also convenient to wind. Since in Embodiment 2, the two excitation windings 3 and the signal winding at each local position are arranged in layers along the radial direction of rotor 1, the signal winding can be naturally separated from the two excitation windings 3 during winding, without the need for additional insulation structure.

[0027] In practical implementation, as a complete product structure, such as Figure 7 As shown, the reluctance rotary transformer also includes a housing 12 and a rotor shaft 11. The stator 2 and the rotor 1 are both disposed inside the housing 12. The stator 2 is fixedly connected to the housing 12. The rotor 1 is fixedly sleeved on the rotor shaft 11. The rotor shaft 11 is rotatably connected to the housing 12. One end of the rotor shaft 11 extends out of the housing 12 to facilitate connection with external rotating parts.

[0028] Furthermore, an oil distributor 13 is provided at the top center of the housing 12. The oil distributor 13 includes an oil inlet 14 and several oil distribution ports 15, all of which are connected to the oil inlet 14. The oil inlet 14 is located outside the housing 12, and the oil distribution ports 15 are located inside the housing 12. Several oil drain ports 16 are also provided at the bottom of the housing 12. When this reluctance rotary transformer is in use, cooling oil is injected into the oil inlet 14. After being discharged through each oil distribution port 15, the cooling oil flows downward under its own weight. During the flow of the cooling oil, it can directly act on the stator 2, each excitation winding 3, and each signal winding for heat dissipation. Finally, the cooling oil flows out from the oil drain ports 16.

[0029] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A reluctance rotary transformer, comprising a stator and a rotor, wherein the rotor is coaxially disposed within the stator, characterized in that, The stator has a plurality of stator teeth evenly distributed on its inner circumference, and the rotor has a plurality of salient poles evenly distributed on its outer circumference. The rotor and the stator are adapted to the structure of a reluctance motor. The stator teeth have an H-shaped cross-section, and each end of the stator teeth has an outer opening and an inner opening, which are arranged sequentially along the radial direction of the rotor. Each pair of adjacent stator teeth constitutes a winding unit. An outer cross-winding region is formed between the two outer openings of the winding unit, and an inner cross-winding region is formed between the two inner openings of the winding unit. Excitation windings are wound in both the outer and inner cross-winding regions. The excitation windings in the outer cross-winding regions are wound in the same direction, while the excitation windings in the inner cross-winding regions are wound in the opposite direction to those in the outer cross-winding regions. All the excitation windings are connected in series. Signal windings are wound on the outer side of the stator teeth. The axis of the signal windings is arranged along the radial direction of the rotor. The signal windings on the stator teeth are equally divided into a number of sine windings and a number of cosine windings. The sine windings and cosine windings are arranged alternately. The winding directions of two adjacent sine windings are opposite. The sine windings are connected in series in sequence. The winding directions of two adjacent cosine windings are opposite. The cosine windings are connected in series in sequence.

2. A reluctance rotary transformer according to claim 1, characterized in that, There are ten salient poles and eight stator teeth. The eight stator teeth are named sequentially according to their circumferential arrangement: first tooth, second tooth, third tooth, fourth tooth, fifth tooth, sixth tooth, seventh tooth, and eighth tooth. The excitation windings are wound in a clockwise direction between the outer openings of the first and second teeth, the third and fourth teeth, the fifth and sixth teeth, and the seventh and eighth teeth. The excitation windings are wound in a counter-clockwise direction between the inner openings of the first and second teeth, the third and fourth teeth, the fifth and sixth teeth, and the seventh and eighth teeth. The outer sides of the first and fifth teeth are wound with the sinusoidal winding in the forward direction, while the outer sides of the third and seventh teeth are wound with the sinusoidal winding in the reverse direction. The cosine windings are wound in the opposite direction on the outer sides of the second and sixth teeth, and the cosine windings are wound in the forward direction on the outer sides of the fourth and eighth teeth.

3. A reluctance rotary transformer according to claim 1 or 2, characterized in that, It also includes a housing and a rotor shaft. The stator and rotor are both disposed inside the housing. The stator is fixedly connected to the housing. The rotor is fixedly sleeved on the rotor shaft. The rotor shaft is rotatably connected to the housing. One end of the rotor shaft extends out of the housing.

4. A reluctance rotary transformer according to claim 3, characterized in that, An oil distributor is provided at the top center of the housing. The oil distributor includes an oil inlet and several oil distribution ports, all of which are connected to the oil inlet. The oil inlet is located outside the housing, and the oil distribution ports are located inside the housing. Several oil drain ports are also provided at the bottom of the housing.

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