Novel shaft-embedded contactless power transfer for separately excited motors
By designing a contactless power transmission system for a different excitation motor, the problem of lack of contactless power transmission mechanisms in the prior art is solved, and efficient and economical power transmission and cooling effects are achieved, supporting higher speed operations and reducing costs and electromagnetic interference risks.
Patent Information
- Application Number
- CN202311642774.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-10-03
- Filing Date
- 2023-12-01
- Publication Date
- 2025-04-04
AI Technical Summary
There is a lack of contactless power transmission mechanisms for different excitation motors in the prior art.
A power transfer system is designed, including a rotary core, a rotary high-index core winding, a fixed high-index core winding and a stator reference core, converting AC to DC through a rotor rectifier mounting plate and passive cooling through cooling fluid.
It realizes contactless power transmission, reduces the demand for axial length, supports higher speed operations, optimizes heat emission and heat dissipation of power electronics, and reduces costs and electromagnetic interference risks.
Smart Images
Figure CN119765802A_ABST
Abstract
Description
Technical Field
[0001] introduction
[0002] The present disclosure relates to contactless power transfer for separately excited motors. Currently, there is no technology to use contactless power transfer mechanisms for separately excited motors. Summary of the invention
[0003] A power transfer system for a separately excited electric machine includes: a rotating magnetic core; a rotating high index core winding radially located within the rotating magnetic core; a fixed high index core winding radially located within the rotating high index core winding; and a stator reference magnetic core radially located within the fixed high index core winding. The power transfer system may include a rotor rectifier mounting plate operatively attached to the rotating magnetic core. The fixed high index core winding may include a first fixed high index core winding and a second fixed high index core winding.
[0004] The fixed high index core winding and the stator reference core do not rotate. The rotor rectifier mounting plate may include rectifiers to convert AC to DC, the rectifiers being operatively attached to the rotating high index core winding, and the mounting plate may be further configured as a heat sink. The rotor rectifier mounting plate may be operatively attached to the rotating core via an adhesive. The power transfer system may be configured to allow a cooling fluid to pass therethrough.
[0005] A vehicle having a contactless power transfer mechanism for a separately excited motor, the contactless power transfer mechanism comprising: a rotating magnetic core; a rotating high-index core winding located within the rotating magnetic core; a fixed high-index core winding located within the rotating high-index core winding; and a stator reference magnetic core located within the fixed high-index core winding. The fixed high-index core winding and the stator reference magnetic core do not rotate.
[0006] The rotor rectifier is operatively attached to the rotating magnetic core and includes: a mounting plate; one or more rectifiers; and a second plate. The one or more rectifiers are located between the mounting plate and the second plate. A cooling fluid is allowed to pass through the contactless power transfer mechanism, and the mounting plate and the second plate may have holes to facilitate cooling.
[0007] The one or more rectifiers may be configured to convert AC to DC, and the mounting plate may be configured as a heat sink. The mounting plate may be operatively attached to the rotating magnetic core via an adhesive. The fixed high index core winding may include a first fixed high index core winding and a second fixed high index core winding.
[0008] The present invention also includes the following scheme:
[0009] 1. A power transmission system for a separately excited motor, the power transmission system comprising:
[0010] Rotating core;
[0011] a rotating high index core winding radially located within the rotating magnetic core;
[0012] a fixed high-index core winding located radially within the rotating high-index core winding; and
[0013] A stator reference core is located radially within the fixed high index core winding.
[0014] 2. The power transmission system according to claim 1, further comprising:
[0015] A rotor commutator mounting plate is operatively attached to the rotating magnetic core.
[0016] 3. The power transfer system of claim 2, wherein the fixed high-index core winding further comprises:
[0017] a first fixed high index core winding; and
[0018] Second fixed high index core winding.
[0019] 4. A power transfer system according to claim 3, wherein the fixed high-index core winding and the stator reference core do not rotate.
[0020] 5. A power transfer system according to claim 4, wherein the rotor rectifier mounting plate includes a rectifier for converting AC to DC, and the rectifier is operatively attached to the rotating high index core winding.
[0021] 6. The power transfer system of claim 4, wherein the rotor rectifier mounting plate is further configured as a heat sink.
[0022] 7. The power transfer system of claim 6, wherein the rotor rectifier mounting plate is operatively attached to the rotating magnetic core via an adhesive.
[0023] 8. The power transfer system of claim 7, wherein the power transfer system is configured to allow a cooling fluid to pass therethrough.
[0024] 9. The power transfer system of claim 2, wherein the rotor rectifier mounting plate is further configured as a heat sink.
[0025] 10. The power transfer system of claim 9, wherein the rotor rectifier mounting plate is operatively attached to the rotating magnetic core via an adhesive.
[0026] 11. The power transfer system of claim 2, wherein the rotor rectifier mounting plate includes a rectifier for converting AC to DC.
[0027] 12. The power transfer system of claim 11, wherein the rotor rectifier mounting plate is further configured as a heat sink.
[0028] 13. A vehicle having a non-contact power transfer mechanism for a separately excited motor, the non-contact power transfer mechanism comprising:
[0029] Rotating core;
[0030] a rotating high index core winding located within the rotating magnetic core;
[0031] a fixed high index core winding located within the rotating high index core winding; and
[0032] a stator reference core located within the fixed high-index core winding, wherein the fixed high-index core winding and the stator reference core do not rotate;
[0033] a rotor rectifier operatively attached to the rotating magnetic core, wherein the rotor rectifier further comprises:
[0034] Mounting plate;
[0035] one or more rectifiers; and
[0036] a second plate, wherein the one or more rectifiers are located between the mounting plate and the second plate,
[0037] Wherein a cooling fluid is allowed to pass through the contactless power transfer mechanism, and the mounting plate and the second plate have holes to facilitate cooling.
[0038] 14. A vehicle having a contactless power transfer mechanism according to claim 13, wherein the one or more rectifiers are configured to convert AC to DC.
[0039] 15. A vehicle having a contactless power transfer mechanism according to claim 14, wherein the mounting plate is further configured as a heat sink.
[0040] 16. A vehicle having a contactless power transfer mechanism according to claim 15, wherein the mounting plate is operatively attached to the rotating magnetic core via an adhesive.
[0041] 17. The vehicle having a contactless power transfer mechanism according to claim 16, wherein the fixed high-index core winding further comprises:
[0042] a first fixed high index core winding; and
[0043] Second fixed high index core winding.
[0044] 18. The vehicle having a contactless power transfer mechanism according to claim 13, wherein the fixed high-index core winding further comprises:
[0045] a first fixed high index core winding; and
[0046] Second fixed high index core winding.
[0047] 19. A vehicle having a contactless power transfer mechanism according to claim 18, wherein the mounting plate is further configured as a heat sink.
[0048] 20. A vehicle having a contactless power transfer mechanism according to claim 19, wherein the mounting plate is operatively attached to the rotating magnetic core via an adhesive.
[0049] The above features and advantages and other features and advantages of the present disclosure are readily apparent from the following detailed description of the best modes for carrying out the disclosure when taken in connection with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0050] Figure 1 is a schematic top isometric view of a contactless power transfer mechanism for a separately excited motor.
[0051] Figure 2 is a schematic bottom isometric view of a contactless power transfer mechanism.
[0052] Figure 3 is a schematic exploded view of the contactless power transfer mechanism.
[0053] Figure 4 is a schematic side view of a contactless power transfer mechanism.
[0054] Figure 5 is a schematic top view of a contactless power transfer mechanism, showing section lines.
[0055] Figure 6 is a schematic top view of a contactless power transfer mechanism.
[0056] Figure 7 is a schematic bottom view of the contactless power transfer mechanism.
[0057] Figure 8 It is a contactless power transmission mechanism along Figure 5 A schematic cross-sectional view taken along line AA.
[0058] Fig. 9 It is a contactless power transmission mechanism along Figure 5 A schematic cross-sectional view taken along line BB of FIG. DETAILED DESCRIPTION
[0059] Referring to the various drawings, like reference numerals refer to similar parts whenever possible. In general, a separately excited machine is a machine in which the field windings or coils are excited by a separate or external source. The flux produced by the poles depends on the field current (i.e., the flux is proportional to the field current) for regions where the magnetic material of the poles is not saturated, but in the saturated region, the flux remains constant.
[0060] Figure 1 is a schematic top isometric view of the contactless power transfer mechanism 10, and Figure 2 is a schematic bottom isometric view of the contactless power transfer mechanism 10 . Figure 3 is a schematic exploded view of the contactless power transfer mechanism 10 .
[0061] The remaining figures illustrate various views of the contactless power transfer mechanism 10 . Figure 4 is a schematic side view of the contactless power transfer mechanism 10 . Figure 6 is a schematic top view of the contactless power transfer mechanism 10, and Figure 7 is a schematic bottom view of the contactless power transmission mechanism 10 .
[0062] The illustrations and figures presented herein are geometric figures, not drawn to scale, and are provided purely for descriptive purposes. Therefore, any specific or relative size or alignment shown in the illustrations will not be interpreted as limiting. Although the present disclosure may be illustrated with respect to a specific application or industry, those skilled in the art will recognize the wider applicability of the present disclosure. Those of ordinary skill in the art will recognize that terms such as "above", "below", "upward", "downward", etc. are used to describe the figures and do not represent limitations on the scope of the present disclosure as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and are not intended to limit the scope of the present disclosure in any way.
[0063] Features shown in one figure may be combined with, replace, or be modified by features shown in any figure. Unless otherwise indicated, features, elements, or limitations are not mutually exclusive with any other features, elements, or limitations. In addition, features, elements, or limitations are not absolutely required for operation. Any specific configuration shown in the figures is illustrative only, and the specific configuration shown does not limit the claims or description.
[0064] The term vehicle applies broadly to any mobile platform. Vehicles into which the present disclosure may be incorporated include, for example, but not limited to: passenger or freight vehicles; autonomous vehicles; industrial, construction, and mining equipment; and various types of aircraft.
[0065] All numerical values of parameters (e.g., quantities or conditions) in this specification (including the appended claims) will be understood to be modified by the term "approximately" in all cases, whether or not the term actually appears before the numerical value. "Approximately" indicates that the stated numerical value allows a certain slight imprecision (close to the exact value in some way; approximately or reasonably close to the value; almost). If the imprecision provided by "approximately" is not understood in this ordinary sense in the art, "approximately" as used herein at least indicates the changes that may be caused by the ordinary methods of measuring and using such parameters. In addition, the disclosure of the range includes the disclosure of all values within the full range and the further divided range. Each value within the range and the endpoints of the range are hereby all disclosed as separate embodiments.
[0066] As used herein, the term "substantially" often refers to an ideally perfect or complete relationship, but where manufacturing realities prevent absolute perfection. Thus, substantially represents a typical deviation from perfection. For example, if height A is substantially equal to height B, it may be preferred that the two heights be 100.0% equal, but manufacturing realities may well result in deviations from such perfection. A skilled artisan will recognize an acceptable amount of variation. For example, but not limited to, coverage, area, or distance may typically be within 10% of substantially equivalent perfection. Similarly, relative alignment (such as, parallel or perpendicular) may typically be considered to be within 5%.
[0067] A general control system, computing system, or controller is in operative communication with all of the system's relevant components and can be identified by one of ordinary skill in the art. A controller includes, for example, but not limited to, a non-general purpose electronic control device having a pre-programmed digital computer or processor, a memory, storage device, or non-transitory computer-readable storage medium for storing data (such as control logic, instructions, lookup tables, etc.), and a plurality of input / output peripherals, ports, or communication protocols.
[0068] In addition, the controller may include or communicate with multiple sensors. The controller is configured to execute or implement all control logic or instructions described herein and may communicate with any sensor described herein or identifiable by a skilled person. Any method described herein may be performed by one or more controllers.
[0069] like Figure 3 In and also Figure 8 The best illustration in Figure 8 The non-contact power transmission mechanism 10 is Figure 5 A schematic cross-sectional view taken along line AA of FIG. Fig. 9 The non-contact power transmission mechanism 10 is Figure 5The contactless power transfer mechanism 10 includes: a rotating magnetic core 12; and a rotating high-index core winding 14, which is radially located inside the rotating magnetic core 12. The contactless power transfer mechanism 10 also includes: a fixed high-index core winding 20, which is radially located inside the rotating high-index core winding 14; and a stator reference core 22, which is radially located inside the fixed high-index core winding 20.
[0070] Although in Figure 8 and Fig. 9 , but there is an air gap between the rotating high index core winding 14 and the fixed high index core winding 20. Additionally, there is an air gap between the rotating magnetic core 12 and the stator reference magnetic core 22. Note that a cooling fluid (not shown or numbered) is allowed to pass through the contactless power transfer mechanism 10, and in particular through the holes 24 in the stator reference magnetic core 22. This allows for passive cooling of the contactless power transfer mechanism 10 via the holes 24. Note that passive cooling may be optional.
[0071] Typically, only the outer windings (rotating high index core windings 14) experience centripetal forces in the outward direction when they are rotating at high speeds. By utilizing high index wire, each turn is supported by the outer core material (rotating core 12). Note that the entire contactless power transfer mechanism 10 can be press fit into the hollow shaft 38 (in Fig. 9 ) in a highly schematic manner.
[0072] The contactless power transfer mechanism 10 also includes a rotor rectifier mounting plate 30 that is operatively attached to the rotating magnetic core 12. The rotor rectifier mounting plate 30 includes a rectifier 32 for converting AC to DC. The rotor rectifier mounting plate 30 also includes a mounting plate 34 that can also serve as a heat sink and a second plate 36 that can cover the rectifier 32.
[0073] The rectifier 32 is operatively attached to the rotating high index core winding 14 and may be welded to either the mounting plate 34 or the second plate 36. Note that in some configurations, there may also be holes through the rotor rectifier mounting plate 30 and the second plate 36 (although this alternative is not shown in the figures) so that passive fluid cooling of the rectifier 32 is also facilitated.
[0074] The fixed high index core winding 20 may be divided into two distinct windings (not individually numbered). This will allow the contactless power transfer mechanism 10 to utilize two independent rotor windings on the stator reference core 22 to allow for decoupled field excitation and fault tolerant operation. These winding sets (which may be referred to as the first winding set and the second winding set) are isolated from each other to substantially limit any interference. The first winding set may be substantially separate from the second winding set, or they may be interwoven with alternating windings.
[0075] Note that the fixed high index core windings 20 and the stator reference core 22 do not rotate. In some configurations, the rotor rectifier mounting plate 30 is operatively attached to the rotating core 12 via an adhesive (not shown). One of ordinary skill in the art will recognize suitable adhesives that can withstand the heat generated by the contactless power transfer mechanism 10. Further, note that the adhesive can be an excellent thermal conductor to allow heat to be dissipated from the rectifier 32 (printed circuit board (PCB), which includes the diodes) acting as a heat sink to the rest of the contactless power transfer mechanism 10, as well as elsewhere.
[0076] Among the benefits of the contactless power transfer mechanism 10 are, but are not limited to, the following: reduced need for increased axial length due to rotor power transfer required for a separately excited motor; higher speed operation; optimized power electronics heat removal and heat dissipation using PCB carriers and transformer core materials to conduct heat to a larger drive unit housing; the power transfer member is placed inside a hollow shaft, and the shaft acts as a shield to mitigate external electromagnetic interference (EMI); elimination of the need for a dry environment to house the rotor power transfer member and additional components (such as sealed bearings); cost savings by eliminating wear items (such as brushes for rotor power transfer); and / or reduced risk of brush wear debris and friction losses due to moving interface contacts and contact loss arcs.
[0077] The detailed description and the drawings or figures support and describe the subject matter herein.While some best modes and other embodiments have been described in detail, various alternative designs, embodiments and configurations exist.
[0078] Furthermore, the features of any example shown in the drawings or the various examples mentioned in this description do not have to be understood as examples that are independent of one another. On the contrary, it is possible that each of the features described in one of the examples of the embodiment can be combined with one or more other desired features from other examples, thereby generating other examples that are not described in words or by reference to the drawings. Therefore, such other examples fall within the framework of the scope of the appended claims.
Claims
1. A power transmission system for a separately excited motor, the power transmission system comprising: Rotating core; a rotating high index core winding radially located within the rotating magnetic core; a fixed high-index core winding located radially within the rotating high-index core winding; and A stator reference core is located radially within the fixed high index core winding.
2. The power transfer system of claim 1 , further comprising: A rotor commutator mounting plate is operatively attached to the rotating magnetic core.
3. The power transfer system of claim 2, wherein: The fixed high index core winding further comprises: a first fixed high index core winding; and Second fixed high index core winding.
4. The power transfer system of claim 3, wherein: The fixed high-index core winding and the stator reference core do not rotate.
5. The power transfer system of claim 4, wherein: The rotor rectifier mounting plate includes a rectifier for converting AC to DC, the rectifier being operatively attached to the rotating high index core winding.
6. The power transfer system of claim 4, wherein: The rotor rectifier mounting plate is further configured as a heat sink.
7. The power transfer system of claim 6, wherein: The rotor commutator mounting plate is operatively attached to the rotating magnetic core via an adhesive.
8. The power transfer system of claim 7, wherein: The power transfer system is configured to allow a cooling fluid to pass therethrough.
9. The power transfer system of claim 2, wherein: The rotor rectifier mounting plate is further configured as a heat sink.
10. The power transfer system of claim 9, wherein: The rotor commutator mounting plate is operatively attached to the rotating magnetic core via an adhesive.