Wound-rotor resolver

Abstract

The utility model discloses a kind of winding type rotary transformers, including stator core and rotor core, first excitation coil and second excitation coil are wound on stator core, first excitation signal on first excitation coil and second excitation signal on second excitation coil are orthogonal, first output coil and second output coil are wound on rotor core, first output coil is inducted to first excitation signal and second excitation signal and generates first output signal, second output coil is inducted to first excitation signal and second excitation signal and generates second output signal.The winding type rotary transformer of the utility model, by orthogonal excitation coil and the novel output structure of redundancy output coil, after the output signal of redundancy structure rotary transformer is decoded using coherent demodulation principle, after any coil broken wire fault, rotary transformer can still be realized normal angle detection.Solved the problem that traditional rotary transformer cannot accurately decode motor information after output broken wire.

Description

Technical Field

[0001] This utility model belongs to the field of rotary transformer technology, and specifically relates to a wound rotary transformer. Background Technology

[0002] In motor systems, position information is typically acquired using sensors such as photoelectric encoders, magnetic encoders, and rotary transformers. Among these, rotary transformers are resistant to dirt and dust, vibration, and electromagnetic interference, have a wide temperature range, and good stability. Wound rotary transformers, on the other hand, can provide more accurate angle information than reluctance rotary transformers and can achieve higher accuracy in most environmental conditions.

[0003] A rotary transformer is a device that measures rotor angular displacement based on the principle of electromagnetic induction. Both the stator and rotor cores of a wound-rotor rotary transformer are equipped with windings. In practical applications, the rotary transformer rotor is usually mounted coaxially with the motor rotor. As the motor rotates, the angle between the rotor axis and the stator winding axis changes continuously, causing changes in the coupling magnetic flux. This results in a change in the induced voltage in the output winding, allowing the calculation of the relative position of the motor rotor core and stator core.

[0004] In practical applications, the windings of a rotary transformer may experience open circuits due to strong external impacts, welding defects, or other factors. This can cause the electric drive system to fail to accurately obtain rotor position information, leading to motor control system failure and serious consequences.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a wound rotary transformer that can provide redundant and reliable output.

[0007] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0008] A wound-rotor rotary transformer includes a stator core and a rotor core. A first excitation coil and a second excitation coil are wound on the stator core. A first excitation signal on the first excitation coil and a second excitation signal on the second excitation coil are orthogonal. A first output coil and a second output coil are wound on the rotor core. The first output coil induces a first output signal in response to the first excitation signal and the second excitation signal, and the second output coil induces a second output signal in response to the first excitation signal and the second excitation signal.

[0009] In one or more embodiments of this utility model, the signal on the first output coil and the signal on the second output coil are orthogonal to each other.

[0010] In one or more embodiments of the present invention, the wound rotary transformer further includes a coupling transformer, the primary side of which is connected to the first output coil and the second output coil respectively, so as to couple the first output signal and the second output signal for output.

[0011] In one or more embodiments of this utility model, the coupling transformer includes a first coupling module and a second coupling module. The primary side of the first coupling module is connected to a first output coil to couple a first output signal, and the primary side of the second coupling module is connected to a second output coil to couple a second output signal.

[0012] In one or more embodiments of this utility model, the first coupling module includes a first rotor magnetic structure fixedly mounted to the rotor and a first stator magnetic structure magnetically coupled to the first rotor magnetic structure. The first rotor magnetic structure is connected to a first output coil to generate a first coupling output signal through electromagnetic induction in the first stator magnetic structure based on a first output signal; and / or

[0013] The second coupling module includes a second rotor magnetic structure fixedly mounted to the rotor and a second stator magnetic structure magnetically coupled to the second rotor magnetic structure. The second rotor magnetic structure is connected to a second output coil to generate a second coupled output signal through electromagnetic induction in the second stator magnetic structure based on the second output signal.

[0014] In one or more embodiments of this utility model, the first rotor magnetic guiding structure includes a first rotor magnetic guiding ring fixedly mounted to the rotor, a first rotor magnetic guiding coil wound on the first rotor magnetic guiding ring, the first rotor magnetic guiding coil being connected to a first output coil, and the first stator magnetic guiding structure being magnetically coupled to the first rotor magnetic guiding ring; and / or

[0015] The second rotor magnetic guiding structure includes a second rotor magnetic guiding ring fixedly mounted to the rotor and a second rotor magnetic guiding coil wound on the second rotor magnetic guiding ring. The second rotor magnetic guiding coil is connected to the second output coil, and the second stator magnetic guiding structure is magnetically coupled to the second rotor magnetic guiding ring.

[0016] In one or more embodiments of this utility model, a first protrusion is formed on the first rotor magnetic ring extending toward the first stator magnetic structure; and / or

[0017] The second rotor magnetic ring has a second protrusion extending toward the second stator magnetic structure.

[0018] In one or more embodiments of this utility model, the first stator magnetic guiding structure includes a first stator magnetic guiding ring magnetically coupled to the first rotor magnetic guiding structure and a first stator magnetic guiding coil wound on the first stator magnetic guiding ring, wherein the first stator magnetic guiding coil is used to generate a first coupled output signal; and / or

[0019] The second stator magnetic structure includes a second stator magnetic ring magnetically coupled to the second rotor magnetic structure and a second stator magnetic coil wound on the second stator magnetic ring. The second stator magnetic coil is used to generate a second coupled output signal.

[0020] In one or more embodiments of this utility model, a third protrusion is formed on the first stator magnetic ring extending toward the first rotor magnetic structure; and / or

[0021] A fourth protrusion is formed on the second stator magnetic ring extending toward the second rotor magnetic structure.

[0022] In one or more embodiments of this utility model, the first coupling module and the second coupling module are respectively disposed on both sides of the rotor core and the stator core along the axial direction.

[0023] Compared with existing technologies, the wound-rotor rotary transformer of this invention, through a novel output structure of orthogonal excitation coils and redundant output coils, can still achieve normal angle detection even after any coil wire breakage, by decoding the output signal of the redundant structure rotary transformer using the coherent demodulation principle. This solves the problem that traditional rotary transformers cannot accurately decode motor information after output wire breakage. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a partial structural diagram of a wound rotary transformer according to one embodiment of the present invention.

[0026] Figure 2 This is another structural diagram of the wound rotary transformer in one embodiment of the present invention.

[0027] Figure 3 This is an electrical schematic diagram of a wound rotary transformer according to one embodiment of the present invention.

[0028] Figure 4This is a signal waveform diagram of a wound rotary transformer according to an embodiment of the present invention.

[0029] Figure 5 This is a cross-sectional view of the overall structure of a wound rotary transformer according to one embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0031] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. Indirect connections are those made through an intermediate medium, such as those made through an electrically conductive medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in this specification, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0032] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0033] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0034] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0035] Various components and devices may be mentioned or shown in the singular form herein, but only for the convenience of discussion, and any element mentioned in the singular form may include multiple such elements as taught herein.

[0036] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which can refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used in relation to embodiments of this application are synonymous.

[0037] Example 1

[0038] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the wound rotary transformer includes a stator core 10 and a rotor core 20.

[0039] In one embodiment, the rotor core 20 and the stator core 10 are coaxially mounted, with the rotor core 20 located inside the stator core 10. The rotor core 20 is connected to and rotates with the motor shaft, while the stator core 10 remains stationary relative to the motor housing. In other embodiments, a resolver structure with the rotor core 20 located outside the stator core 10 can also be used.

[0040] The stator core 10 is wound with a first excitation coil 11 and a second excitation coil 12. The first excitation signal on the first excitation coil 11 and the second excitation signal on the second excitation coil 12 are orthogonal. The rotor 20 is wound with a first output coil 21 and a second output coil 22. The first output coil 21 induces the first excitation signal and the second excitation signal to generate a first output signal, and the second output coil 22 induces the first excitation signal and the second excitation signal to generate a second output signal.

[0041] In traditional rotary transformers, a set of orthogonal excitation windings is wound on the stator core 10, while only one output winding is wound on the rotor core 20. If this output winding breaks, data output cannot be achieved. This solution superimposes an additional output winding on the rotor core 20 of the traditional rotary transformer, enabling the rotary transformer to still perform normal angle detection even after any winding breaks.

[0042] Preferably, the signal on the first output coil 21 and the signal on the second output coil 22 are orthogonal to each other. That is, the second output coil 22 can be regarded as the first output coil 21 wound around the rotor core 20 after rotating 90° clockwise or 90° counterclockwise around the shaft (for example, the teeth of the rotor 20 are marked as tooth 1, tooth 2... tooth 20, the first output coil 21 is wound 1 turn on tooth 1, 2 turns on tooth 2... then the second output coil 22 is wound 1 turn on tooth 6, which is 90° away from tooth 1, 2 turns on tooth 7, which is 90° away from tooth 2...). Of course, the first output coil 21 and the second output coil 22 can still be staggered in the radial direction of the rotor core 20 to avoid contact interference. The specific number of turns and winding position of the first output coil 21 and the second output coil 22 can be determined by the winding method in the prior art, which will not be elaborated here.

[0043] Preferably, the first excitation coil 11 is arranged radially along the stator core 10 inside the second excitation coil 12 to avoid contact interference.

[0044] Combination Figure 3 and Figure 4 As shown, when sine and cosine electrical signals of a certain frequency are input to the first excitation coil and the second excitation coil, respectively, corresponding sine and cosine magnetic fields are generated in the air gap between the stator core 10 and the rotor core 20. Under the influence of these sine and cosine magnetic fields, a pair of sine and cosine voltage signals with a phase difference of approximately 90° are induced in the first output coil 21 and the second output coil 22, namely the first output signal and the second output signal. The first output signal and the second output signal can be written as:

[0045]

[0046]

[0047] in, This is the first output signal. This is the second output signal, where K is the proportional coefficient. This is the first excitation signal. This is the second excitation signal. The rotation angle of the axis is denoted as .

[0048] Example 2

[0049] like Figure 5 As shown, the wound rotary transformer in this embodiment adds a coupling transformer to the wound rotary transformer of Embodiment 1. The primary side of the coupling transformer is connected to the first output coil 21 and the second output coil 22 respectively to couple the first output signal and the second output signal. By setting the coupling transformer, a brushless wound structure can be realized, avoiding wear of brushes and slip rings and reducing the service life of the rotary transformer.

[0050] Specifically, the coupling transformer includes a first coupling module 31 and a second coupling module 32. The primary side of the first coupling module 31 is connected to the first output coil 21 to couple the first output signal. The primary side of the second coupling module 32 is connected to the second output coil 22 to couple the second output signal.

[0051] Preferably, the first coupling module 31 and the second coupling module 32 are respectively disposed on both sides of the rotor core 20 and the stator core 10 along the axial direction.

[0052] like Figure 5 As shown, the first coupling module includes a first rotor magnetic structure fixedly mounted to the rotor core 20 and a first stator magnetic structure magnetically coupled to the first rotor magnetic structure. The first rotor magnetic structure is connected to the first output coil 21 to generate a first coupled output signal through electromagnetic induction in the first stator magnetic structure based on the first output signal. The first rotor magnetic structure is fixedly mounted to the rotor core 20, and the two rotate synchronously. Through the magnetic coupling between the first rotor magnetic structure and the first stator magnetic structure, the use of brushes and slip rings can be avoided. The first rotor magnetic structure is the primary side of the first coupling module 31.

[0053] In one embodiment, the first rotor magnetic guiding structure and the first stator magnetic guiding structure are coaxially mounted, with the first rotor magnetic guiding structure located inside the first stator magnetic guiding structure. The first stator magnetic guiding structure is fixed to the motor housing and remains stationary. In other embodiments, a coupling structure in which the first rotor magnetic guiding structure is located outside the first stator magnetic guiding structure can also be used.

[0054] The first rotor magnetic structure includes a first rotor magnetic ring 311 fixedly mounted to the rotor core 20 and a first rotor magnetic coil 312 wound on the first rotor magnetic ring 311. The first rotor magnetic coil 312 is connected to the first output coil 21, and the first stator magnetic structure is magnetically coupled to the first rotor magnetic ring 311.

[0055] In one embodiment, the first rotor magnetic coil 312 is wound around the outside of the first rotor magnetic ring 311. In other embodiments, the first rotor magnetic coil 312 may also be wound around the inside of the first rotor magnetic ring 311.

[0056] The signal on the first rotor magnetic coil 312 is the same as the first output signal on the first output coil 21. The first rotor magnetic coil 312 induces a corresponding magnetic field on the first rotor magnetic ring 311 through electromagnetic induction. The first stator magnetic structure senses the magnetic field and generates the first coupled output signal.

[0057] Furthermore, a first protrusion 3111 extends from the first rotor magnetic ring 311 toward the first stator magnetic structure. In one embodiment, there are two first protrusions 3111, located at opposite ends of the first rotor magnetic ring 311 along the axial direction, with the first rotor magnetic coil 312 located between the two first protrusions 3111. The first protrusions 3111 facilitate magnetic coupling induction between the first rotor magnetic ring 311 and the first stator magnetic structure.

[0058] Specifically, the first stator magnetic structure includes a first stator magnetic ring 313 magnetically coupled to the first rotor magnetic ring 311 and a first stator magnetic coil 314 wound on the first stator magnetic ring 313. After the first stator magnetic ring 313 senses the magnetic field of the first rotor magnetic ring 311, it generates a first coupled output signal on the first stator magnetic coil 314 through electromagnetic induction.

[0059] In one embodiment, the first stator magnetic coil 314 is wound around the inner side of the first stator magnetic ring 313. In other embodiments, the first stator magnetic coil 314 may also be wound around the outer side of the first stator magnetic ring 313.

[0060] Furthermore, a third protrusion 3131 extends from the first stator magnetic ring 313 toward the first rotor magnetic structure. In one embodiment, there are two third protrusions 3131, located at opposite ends of the first stator magnetic ring 313 along the axial direction, with the first stator magnetic coil 314 located between the two third protrusions 3131. The third protrusions 3131 facilitate magnetic coupling induction between the first stator magnetic ring 313 and the first rotor magnetic ring 311.

[0061] like Figure 5 As shown, the second coupling module 32 includes a second rotor magnetic conductor structure fixedly mounted to the rotor 20 and a second stator magnetic conductor structure magnetically coupled to the second rotor magnetic conductor structure. The second rotor magnetic conductor structure is connected to the second output coil 22 to generate a second coupled output signal through electromagnetic induction in the second stator magnetic conductor structure based on the second output signal. The second rotor magnetic conductor structure is the primary side of the second coupling module 32.

[0062] In one embodiment, the second rotor magnetic guiding structure is coaxially mounted with the second stator magnetic guiding structure, the second rotor magnetic guiding structure being located inside the second stator magnetic guiding structure, and the second stator magnetic guiding structure being fixed to the motor housing and remaining stationary. In other embodiments, a coupling structure in which the second rotor magnetic guiding structure is located outside the second stator magnetic guiding structure can also be used.

[0063] The second rotor magnetic guiding structure includes a second rotor magnetic guiding ring 321 fixedly installed with the rotor core 20, and a second rotor magnetic guiding coil 322 wound on the second rotor magnetic guiding ring 321. The second rotor magnetic guiding coil 322 is connected to the second output coil 22, and the second stator magnetic guiding structure is magnetically coupled to the second rotor magnetic guiding ring 321.

[0064] In one embodiment, the second rotor magnetic coil 322 is wound around the outside of the second rotor magnetic ring 321. In other embodiments, the second rotor magnetic coil 322 may also be wound around the inside of the second rotor magnetic ring 321.

[0065] Furthermore, a second protrusion is formed on the second rotor magnetic ring 321 extending toward the second stator magnetic structure. In one embodiment, there are two second protrusions, respectively located at both ends of the second rotor magnetic ring 321 along the axial direction, and the second rotor magnetic coil 322 is located between the two second protrusions. The second protrusions facilitate magnetic coupling induction between the second rotor magnetic ring 321 and the second stator magnetic structure.

[0066] The second stator magnetic structure includes a second stator magnetic ring 323 magnetically coupled to the second rotor magnetic structure and a second stator magnetic coil 324 wound on the second stator magnetic ring 323. The second stator magnetic coil 324 is used to generate a second coupled output signal.

[0067] In one embodiment, the second stator magnetic coil 324 is wound around the inner side of the second stator magnetic ring 323. In other embodiments, the second stator magnetic coil 324 may also be wound around the outer side of the second stator magnetic ring 323.

[0068] Furthermore, a fourth protrusion is formed on the second stator magnetic ring 323 extending toward the second rotor magnetic structure. In one embodiment, there are two fourth protrusions, located at opposite ends of the second stator magnetic ring 323 along the axial direction, with the second stator magnetic coil 324 located between the two fourth protrusions. The fourth protrusions facilitate magnetic coupling induction between the second stator magnetic ring 323 and the second rotor magnetic ring 321.

[0069] The working principle of the second coupling module is the same as that of the first coupling module, and will not be elaborated further here.

[0070] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0071] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wound-rotor rotary transformer, characterized in that, The system includes a stator core and a rotor core. A first excitation coil and a second excitation coil are wound on the stator core. A first excitation signal on the first excitation coil and a second excitation signal on the second excitation coil are orthogonal. A first output coil and a second output coil are wound on the rotor core. The first output coil generates a first output signal in response to the first excitation signal and the second excitation signal. The second output coil generates a second output signal in response to the first excitation signal and the second excitation signal.

2. The wound rotary transformer according to claim 1, characterized in that, The signal on the first output coil is orthogonal to the signal on the second output coil.

3. The wound rotary transformer according to claim 1, characterized in that, The wound rotary transformer also includes a coupling transformer, the primary side of which is connected to the first output coil and the second output coil respectively, so as to couple the first output signal and the second output signal for output.

4. The wound rotary transformer according to claim 3, characterized in that, The coupling transformer includes a first coupling module and a second coupling module. The primary side of the first coupling module is connected to the first output coil to couple the first output signal to the output, and the primary side of the second coupling module is connected to the second output coil to couple the second output signal to the output.

5. The wound rotary transformer according to claim 4, characterized in that, The first coupling module includes a first rotor magnetic structure fixedly mounted to the rotor and a first stator magnetic structure magnetically coupled to the first rotor magnetic structure. The first rotor magnetic structure is connected to a first output coil to generate a first coupling output signal in the first stator magnetic structure through electromagnetic induction based on a first output signal. and / or The second coupling module includes a second rotor magnetic structure fixedly mounted to the rotor and a second stator magnetic structure magnetically coupled to the second rotor magnetic structure. The second rotor magnetic structure is connected to a second output coil to generate a second coupled output signal through electromagnetic induction in the second stator magnetic structure based on the second output signal.

6. The wound-rotor rotary transformer according to claim 5, characterized in that, The first rotor magnetic guiding structure includes a first rotor magnetic guiding ring fixedly mounted to the rotor, a first rotor magnetic guiding coil wound on the first rotor magnetic guiding ring, the first rotor magnetic guiding coil being connected to a first output coil, and the first stator magnetic guiding structure being magnetically coupled to the first rotor magnetic guiding ring; and / or The second rotor magnetic guiding structure includes a second rotor magnetic guiding ring fixedly mounted to the rotor and a second rotor magnetic guiding coil wound on the second rotor magnetic guiding ring. The second rotor magnetic guiding coil is connected to the second output coil, and the second stator magnetic guiding structure is magnetically coupled to the second rotor magnetic guiding ring.

7. The wound-rotor rotary transformer according to claim 6, characterized in that, A first protrusion is formed on the first rotor magnetic ring extending toward the first stator magnetic structure; and / or The second rotor magnetic ring has a second protrusion extending toward the second stator magnetic structure.

8. The wound-rotor rotary transformer according to claim 5, characterized in that, The first stator magnetic structure includes a first stator magnetic ring magnetically coupled to the first rotor magnetic structure and a first stator magnetic coil wound on the first stator magnetic ring. The first stator magnetic coil is used to generate a first coupled output signal. and / or The second stator magnetic structure includes a second stator magnetic ring magnetically coupled to the second rotor magnetic structure and a second stator magnetic coil wound on the second stator magnetic ring. The second stator magnetic coil is used to generate a second coupled output signal.

9. The wound-rotor rotary transformer according to claim 8, characterized in that, A third protrusion is formed on the first stator magnetic ring extending toward the first rotor magnetic structure; and / or A fourth protrusion is formed on the second stator magnetic ring extending toward the second rotor magnetic structure.

10. The wound rotary transformer according to claim 4, characterized in that, The first coupling module and the second coupling module are respectively disposed on both sides of the rotor core and the stator core along the axial direction.

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