Electric machine comprising a damping material

Abstract

Some example embodiments provide an electric motor assembly including a dampening material for parasitic current and / or bearing current reduction. The electric motor assembly includes: an electric motor configured to be driven by an electric power source, the electric motor including: a stator frame, a stator winding attached to the stator frame, a rotor enclosed by the stator winding, a shaft extending from the rotor through the stator frame, and a bearing between the shaft and the stator frame; and a dampening material on the shaft.

Description

Technical Field

[0001] Exemplary embodiments relate to devices for reducing bearing current, and more specifically, to reducing bearing current by suppressing materials. Background Technology

[0002] Power electronic devices are commonly used to drive motors as part of electric drive systems. Drivers driven by power electronic devices can use inverters with rapidly switching voltage sources to deliver current to generate motion and / or torque. The motor and attached mechanical transmission components may have parasitic circuits that can be excited by the rapidly switching waveforms of the power electronic devices. In some cases, sufficient energy can flow through these parasitic circuits, such as bearing currents, which can cause physical damage and potentially render the electric drive system and attached mechanical transmission inoperable. Therefore, it is desirable to reduce the energy in the parasitic circuits, and in particular, to reduce bearing currents. Summary of the Invention

[0003] Some exemplary embodiments provide motor assemblies that include materials for suppressing parasitic currents and / or bearing currents.

[0004] Some exemplary embodiments provide an electric motor assembly including: a power source; an electric motor configured to be driven by the power source, the electric motor including: a stator frame, stator windings attached to the stator frame, a rotor surrounded by the stator windings, a shaft extending from the rotor through the stator frame, and a bearing between the shaft and the stator frame; and a damping material on the shaft. Some exemplary embodiments provide an electric motor drive system including: an electric motor assembly including an electric motor configured to be driven by a power source, the electric motor including: a stator frame, stator windings attached to the stator frame, a rotor surrounded by the stator windings, a shaft extending from the rotor through the stator frame, and a bearing between the shaft and the stator frame; a transmission device including a transmission device shaft; a coupling connecting the shaft to the transmission device shaft; and a damping material. Attached Figure Description

[0005] Exemplary embodiments will be more clearly understood from the following detailed description in conjunction with the accompanying drawings. Figures 1 to 8 This represents a non-limiting exemplary embodiment as described herein.

[0006] Figure 1 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0007] Figure 2Aand Figure 2B The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0008] Figure 3 The illustration shows a suppression material according to some exemplary embodiments.

[0009] Figure 4 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0010] Figure 5A and Figure 5B The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0011] Figure 6 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0012] Figure 7 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0013] Figure 8 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0014] Figure 9 The illustration shows a vehicle including an electric motor according to some exemplary embodiments. Detailed Implementation

[0015] Some exemplary embodiments will now be described more fully with reference to the accompanying drawings, in which some exemplary embodiments are illustrated.

[0016] Therefore, while various modifications and alternatives are possible with respect to the exemplary embodiments, those embodiments are shown by way of example in the drawings and will be described in detail herein. However, it should be understood that the exemplary embodiments are not intended to be limited to the specific forms disclosed, but rather, the exemplary embodiments will cover all modifications, equivalents, and alternatives falling within the scope of the claims. Throughout the description of the drawings, the same reference numerals refer to the same elements.

[0017] It should be understood that although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of the exemplary embodiments, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0018] It should be understood that when an element is referred to as “connected” or “coupled” to another element, the element may be directly connected or coupled to the other element, or there may be an intermediary element. Conversely, when an element is referred to as “directly connected” or “directly coupled” to another element, there is no intermediary element. Other terms used to describe the relationship between elements should be interpreted in a similar manner (e.g., “between” vs. “directly between”, “adjacent” vs. “directly adjacent”, etc.).

[0019] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the,” “the” are intended to include the plural forms as well. It will be further understood that, when used herein, the terms “comprising,” “including,” “having,” and / or “with” specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0020] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the exemplary embodiments pertain. It will be further understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with that meaning in the context of the relevant field, and terms shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0021] At least some exemplary embodiments reduce and / or avoid voltage leakage (e.g., parasitic current) through bearing current in motors such as electric motors, electric drive systems, etc.

[0022] When using an electric motor, the motor bearings may generate charges that cause discharges and / or may contribute to the conduction of parasitic currents toward the ground. In this specification, the charges that cause discharges and / or the parasitic currents conducted toward the ground may be collectively referred to as parasitic currents or individually. When the discharge and / or parasitic currents are sufficiently large, the bearings and / or bearing races may, for example, overheat, deform, or otherwise be damaged. As the bearings and / or bearing races deform, greater energy is required to initiate or maintain rotation / motion in the motor, which is undesirable.

[0023] In some exemplary embodiments, magnetically suppressing materials can be used to reduce or prevent the formation of parasitic currents by reducing or blocking energy from reaching the bearings. Therefore, the lifespan and efficiency of the motor according to some exemplary embodiments can be improved.

[0024] Figure 1The illustration shows an electric drive system for an electric motor according to some exemplary embodiments. Figure 2A and Figure 2B The illustration shows an electric drive system for an electric motor according to some exemplary embodiments. Figure 3 The illustration shows a suppression material according to some exemplary embodiments.

[0025] The electric drive system 100 may include a motor 110, a suppression module 120, a coupling 130, a lubrication system 140, a busbar 150, an inverter 160, and an electronic data processing system 170. The motor 110 may include a stator frame 111, stator windings 113, a rotor 115, a shaft 117, and bearings 119. In the following text, the terms "hybrid machine," "electric motor," "alternating current (AC) machine," and "motor" may be used interchangeably. The electric drive system 100 may be referred to as an electric motor drive system.

[0026] In some exemplary embodiments, inverter 160 can be connected to motor 110 via bus 150. Bus 150 may include conductive wiring 151 extending from inverter 160 to motor 110 and being housed in cable shield 153. Bus 150 may terminate at a protective grounding terminal block 1110 on stator frame 111. In some exemplary embodiments, stator frame 111 may be grounded. Alternatively or additionally, a dedicated grounding circuit may be provided to the protective grounding terminal block and / or other features. In some exemplary embodiments, electronic data processing system 170 can be connected to motor 110 via inverter 160 and bus 150. However, in some exemplary embodiments, electronic data processing system 170 may be connected to inverter 160 and motor 110 separately from or together with bus 150. In some exemplary embodiments, electronic data processing system 170 may be referred to as motor controller. The electronic data processing system 170 combined with the inverter 160 can be referred to as an inverter system. The electronic data processing system 170 can be configured to control the inverter 160 and / or the motor 110.

[0027] In some exemplary embodiments, inverter 160 may be powered by a direct current (DC) voltage bus (not shown). Inverter 160 can supply power to motor 110 (via busbar 150) by converting the supplied DC power into alternating current (AC) power, which causes motor 110 to rotate shaft 117, as discussed further below, and generates mechanical movement from the supplied power. In some exemplary embodiments, inverter 160 can receive AC power and supply DC power. In some exemplary embodiments, inverter 160 can receive AC power and supply AC power. In some exemplary embodiments, inverter 160 can receive DC power and supply DC power. Furthermore, in some exemplary embodiments, motor 110 and inverter 160 can perform regenerative functions and / or act as generators, wherein an external force causes shaft 117 to rotate, motor 110 converts this rotation into electricity, and inverter 160 can convert the generated electricity and / or transmit the generated electricity to another location, such as a battery (not shown) or another electric device.

[0028] In some exemplary embodiments, motor 110 may be an induction motor. In some exemplary embodiments, AC power supplied by inverter 160 may be applied to stator winding 113. The magnetic field generated by stator winding 113 may rotate based on the supplied AC power. The rotating magnetic field of stator winding 113 may induce current in rotor 115, thereby generating a second magnetic field and accelerating the rotation of rotor 115 (e.g., generating torque). The rotation of rotor 115 is transferred to shaft 117. In some exemplary embodiments, motor 110 may be a synchronous electric motor, permanent magnet motor, etc., and operates on a similar principle, wherein current is supplied to the motor and torque is generated to rotate shaft, etc. Inverter 160 may be referred to as a power source. Motor 110 may be referred to as an electric motor assembly.

[0029] The stator frame 111 may accommodate (e.g., surround, retain) a portion of the stator winding 113, rotor 115, and shaft 117. In some exemplary embodiments, the stator winding 113 may be mounted (attached, positioned, etc.) on the inner wall of the stator frame 111. The stator winding 113 may extend circumferentially around the interior of the stator frame 111, and for example, may extend around the entire circumference of the interior of the stator frame 111. The stator winding 113 may have an annular shape; however, exemplary embodiments are not limited thereto.

[0030] In some exemplary embodiments, the shaft 117 may extend through the stator frame 111 in a first direction X. That is, a portion of the shaft 117 may be supported on either side of the stator frame 111 (and bearings 119, etc.). The shaft 117 may be located at the center of the stator winding 113, that is, the shaft may extend through or around the central opening of the annular stator winding 113.

[0031] The rotor 115 can be aligned with the stator winding 113 on the shaft 117. For example, the rotor 115 can be bonded, cured, adhered, or mechanically coupled (e.g., directly coupled) to the shaft 117. The rotor 115 is attached to the shaft 117 such that when one of the rotor 115 and the shaft 117 rotates, the other also rotates. The rotor 115 can have a length less than or equal to that of the stator winding 113 in a first direction X. The rotor 115 can be separated from the stator winding 113 in a second direction Y. In this way, the rotor 115 can rotate freely while aligned with the stator winding 113.

[0032] A shaft 117 may extend through openings OP1 and OP2 through a stator frame 111. Openings OP1 and OP2 may be defined by the stator frame 111 and include a bearing race 1191 to secure a bearing 119 against the stator frame 111. The shaft 117 may include a reciprocating bearing race 1197 to secure the bearing 119 against the shaft 117. In some exemplary embodiments, one or both of the bearing races 1191 and 1197 may be present. Thus, the shaft 117 can be aligned with the bearing 119 in the openings OP1 and OP2 of the stator frame 111 to allow rotation of the shaft 117. The bearing 119 may include a lubricant to improve rotation and frictionless movement. The lubricant may be the same as or different from lubricant 141 discussed below.

[0033] In some exemplary embodiments, shaft 117 may be connected to coupling 130. Coupling 130 may connect shaft 117 to connecting shaft 137. Connecting shaft 137 may apply torque to an external device and / or machine 1370. The external device and / or machine 1370 may be, for example, a transmission for moving a vehicle, a variator for cooperating with another engine, etc. Alternatively or additionally, the shaft may terminate at or include a toothed gear to apply torque from shaft 117 in a direction different from the first direction X. Connecting shaft 137 may be referred to as a transmission shaft, and in some exemplary embodiments, connecting shaft 137 may be connected to a transmission.

[0034] In some exemplary embodiments, the lubrication system 140 may include, for example, a lubricant 141 (not shown) along shaft 117, coupling 130, connecting shaft 137, and / or bearing 119, and a lubrication module 143. The lubrication module 143 may, for example, purify, cool, and / or heat the lubricant 141, as needed by the lubrication system 140 and the entire electric drive system 100. In some exemplary embodiments, the lubrication system 140 is an oil mist lubrication system. However, the exemplary embodiments are not limited to this, and other methods may be used, such as, but not limited to, fluid film lubrication, boundary film lubrication, etc. In some exemplary embodiments, the lubrication system 140 may additionally serve as a cooling system. In some exemplary embodiments, the electric drive system 100 may also include a cooling system (not shown), such as an air cooling system.

[0035] As discussed above, at least one parasitic current may be generated while current is supplied to motor 110. For example, parasitic currents include at least one of circulating bearing current, electrostatic discharge machining (EDM) bearing current, or rotor-to-ground current. However, these are merely exemplary, and other types of parasitic currents may exist in the electric drive system 100.

[0036] In some exemplary embodiments, the circulating bearing current can be formed by allowing the rotor 115 and shaft 117 to pass through the bearing 119 into the stator frame 111, around the bearing 119, and back into the shaft 117. The circulating bearing current can be generated by parasitic flux between the stator winding 113 and the rotor 115. However, this example is merely exemplary, and the circulating bearing current can be formed through different paths in the electric drive system 100.

[0037] In some exemplary embodiments, the EDM bearing current can form a circuit by passing through the gap between the rotor 115 and the stator winding 113, through the stator winding 113 into the stator frame 111, into the bearing 119, reaching the shaft 117, and returning to the rotor 115, surrounding the bearing 119 and returning to the shaft 117. The EDM bearing current can be generated by the potential difference between the stator frame 111, the stator winding 113, and the rotor 115. However, this example is merely exemplary, and the EDM bearing current can be formed through different paths in the electric drive system 100.

[0038] In some exemplary embodiments, the rotor-to-ground current can form a circuit that enters the bearing 119 through the stator frame 111, enters the shaft 117, and is then connected to the ground via the coupling 130 and the connecting shaft 137, connecting the protective grounding terminal block and / or the stator winding 113 to the ground. The rotor-to-ground current can be generated by the circuit described above with sufficiently low resistance (or a similar circuit). However, this example is merely exemplary, and the rotor-to-ground current can be formed via different paths within the electric drive system 100.

[0039] In some exemplary embodiments, parasitic currents can be related to alternating flux due to the asymmetric magnetic properties of the stator winding 113 and / or rotor 115. In other words, there are multiple methods and paths for generating bearing currents through the electric drive system 100.

[0040] In some exemplary embodiments, the suppression module 120 (e.g., any one or more of suppression modules 120 to 120e) can prevent or reduce parasitic currents along and / or through the shaft 117. The suppression module 120 may be located outside and adjacent to the stator frame 111 and bearing 119 along the shaft 117. That is, in some exemplary embodiments, the suppression module 120 may directly contact the stator frame 111. The suppression module 120 may cover at least a portion of the shaft 117, and in some exemplary embodiments, the suppression module 120 may extend (e.g., fully extend) between the stator frame 111 and the coupling 130.

[0041] In some exemplary embodiments, the suppression module can generate a magnetic field to suppress parasitic currents. In some exemplary embodiments, the first distance can be based on the magnitude of the magnetic field generated by the suppression module 120. For example, if the suppression module 120 is too strong and / or too close to the rotor 115, the magnetic field of the suppression module 120 may interfere with the operation of the motor 110. Because the magnetic field of the suppression module 120 affects the rotor 115, the rotor 115 may require more energy to rotate and generate torque, and / or the rotor 115 may not rotate as needed based on the power applied to the stator winding 113. Furthermore, the weight, placement, and / or shape of the suppression module 120 may affect the balance of the rotor 115 and / or the mechanical properties of the electric drive system 100. Therefore, in some exemplary embodiments, the suppression module 120 may be positioned at a first distance from the rotor 115 based on the strength of the magnetic field generated by the suppression module 120 and / or the mechanical properties of the electric drive system 100.

[0042] The suppression module 120 may include a retainer 121 and a suppression material 123. In some exemplary embodiments, the retainer 121 may be a housing for retaining the suppression material 123; however, the retainer 121 may alternatively be a frame, cage, and / or support for retaining the suppression material 123. The retainer 121 may hold the suppression material 123 adjacent (e.g., directly adjacent) to the surface of the shaft 117, spaced apart (e.g., only by lubricant 141), and the retainer 121 may have the same or similar shape as the external shape of the suppression material 123. The retainer 121 may be fixed to the stator frame 111. Alternatively and / or additionally, the retainer 121 may be fixed to another feature (not shown) and / or enable the shaft 117 to pass from the stator frame 111 to the coupling 130.

[0043] In some exemplary embodiments, the suppressing material 123 may have an annular shape with an inner periphery larger than the outer periphery of the shaft 117, such that the suppressing material 123 surrounds the shaft 117. (See reference...) Figure 3 The suppressing material 123 may have an annular shape, having a cylindrical profile defining the bore 1230 in a plan view. The shaft 117 may be fitted into the bore 1230, such as... Figures 1 to 2B What I saw.

[0044] In some exemplary embodiments, the inner periphery of the suppressing material 123 may have a shape that is the same as but larger than the profile of the shaft 117, a shape that closely matches the profile of the shaft 117, or the inner periphery of the suppressing material 123 may have a different shape in its profile (e.g., a toothed circle, an ellipse). In some exemplary embodiments, the outer profile of the suppressing material 123 may be circular, similar to but larger than the inner periphery; however, other shapes (e.g., squares, octagons, irregular polygons) and / or profiles may be used. For example, the suppressing material 123 and the retainer 121 may have matching teeth and / or profiles to engage with each other and prevent or reduce rotation and movement. In this document, "one tooth" to "multiple teeth" may refer to a protrusion that enters or exits the surface in a regular or irregular pattern.

[0045] In some exemplary embodiments, the inhibiting material 123 does not directly contact the shaft 117 (or other features surrounded by the inhibiting module 120, such as the coupling 130), but is separated from it by a gap between the inhibiting material 123 and the shaft 117. In some exemplary embodiments, the gap between the inhibiting material 123 and the shaft 117 may be determined by the position of the shaft 117, the size of the shaft 117, and / or the manufacturing tolerances of the shaft 117 and / or the inhibiting material 123. In some exemplary embodiments, the gap is based on the compressibility of the lubricant 141; for example, the gap may be a distance equal to the minimum depth allowing the lubricant 141 to flow.

[0046] In some exemplary embodiments, the suppression material 123 may be a material capable of suppressing current, for example, acting as a choke. In some exemplary embodiments, the suppression material 123 is a ferrite material (e.g., manganese ferrite) and / or a nanocrystalline magnetic material. Specific materials (e.g., ferrite composition) may be selected based on the electrical and material properties of the electric drive system 100.

[0047] In some exemplary embodiments, the suppressing material 123 may be a single ring-shaped body or may be multiple ring-shaped bodies. When the suppressing material 123 is multiple ring-shaped bodies, the multiple ring-shaped bodies may be made of the same or different materials.

[0048] Figure 4 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0049] For ease of description, additional descriptions related to the components described above will be omitted below to avoid redundancy. References Figure 4 The electric drive system 100a may include a motor 110, a suppression module 120a, a coupling 130a, a lubrication system 140, a busbar 150, an inverter 160, and an electronic data processing system 170. The coupling 130a may connect the shaft 117 and the connecting shaft 137 in the same or similar manner as the coupling 130.

[0050] In some exemplary embodiments, the suppression module 120a may be located at the coupling 130a between the shaft 117 and the connecting shaft 137. The suppression module 120a may include a retainer 121a and a suppression material 123a. Except that the suppression module 120a is coupled to the coupling 130a, the suppression module 120a may be the same as or similar to the suppression module 120. The coupling 130a may have the same or different diameter and / or shape as the shaft 117, and the coupling 130a may have the same or different diameter and / or shape as the connecting shaft 137.

[0051] In some exemplary embodiments, the suppressing material 123a may have an annular shape, the inner periphery of which is larger than the outer periphery of the coupling 130a, such that the suppressing material 123a surrounds the coupling 130a. In some exemplary embodiments, the inner periphery of the suppressing material 123a may have a shape that is the same as but larger than the contour of the coupling 130a, a shape that closely matches the contour of the coupling 130a, or the inner periphery of the suppressing material 123a may have a different shape in contour (e.g., a toothed circle, an ellipse). In some exemplary embodiments, the retainer 121a may be a housing for retaining the suppressing material 123a; however, the retainer 121a may alternatively be a frame, cage, and / or support for retaining the suppressing material 123a. The suppressing material 123a may be the same as or a different material from the suppressing material 123.

[0052] In some exemplary embodiments, the suppression module 120a may include an extension section for covering at least a portion of the shaft 117 and / or the connecting shaft 137. The extension section of the suppression module 120a may have the same profile and / or shape as the suppression module 120a on the coupling 130a.

[0053] Figure 5A and Figure 5B The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0054] For ease of description, additional descriptions related to the components described above will be omitted below to avoid redundancy. References Figure 5A The electric drive system 100b may include a motor 110, a suppression module 120b, a coupling 130, a lubrication system 140, a busbar 150, an inverter 160, and an electronic data processing system 170.

[0055] In some exemplary embodiments, the suppression module 120b is on the shaft 117 within the stator frame 111. In some exemplary embodiments, the suppression module 120b may be adjacent to (e.g., directly adjacent to) the stator frame 111, adjacent to (e.g., directly adjacent to) the rotor 115, or between the stator frame 111 and the rotor 115. In some exemplary embodiments, the suppression module 120b may extend along the shaft 117 from the rotor 115 to the stator frame. In some exemplary embodiments, the suppression module 120b is fixed to one of the stator frame 111 or the rotor 115, or the suppression module 120b may be slidable along the shaft 117. The suppression module 120b may be on a first side of the rotor 115 facing the coupling 130, on a second side of the rotor away from the coupling 130 (e.g., opposite to the coupling 130), or on both the first and second sides of the rotor 115. For example, as... Figure 5BAs shown, the electric actuator system 100b1 may have two suppression modules 120b on the shaft 117 on opposite sides of the rotor 115.

[0056] The suppression module 120b may include a retainer 121b and a suppression material 123b. Except that the suppression module 120b is located within the stator frame 111, the suppression module 120b may be the same as or similar to the suppression module 120.

[0057] In some exemplary embodiments, the suppressing material 123b may have an annular shape, with its inner periphery larger than the outer periphery of the shaft 117, such that the suppressing material 123b surrounds the shaft 117. In some exemplary embodiments, the inner periphery of the suppressing material 123b may have a shape that is the same as but larger than the profile of the shaft 117, a shape that closely matches the profile of the shaft 117, or the inner periphery of the suppressing material 123b may have a different shape in profile (e.g., a toothed circle, an ellipse). In some exemplary embodiments, the retainer 121b may be a housing for retaining the suppressing material 123b; however, the retainer 121b may alternatively be a frame, cage, and / or support for retaining the suppressing material 123b. In some exemplary embodiments, the retainer 121b may cooperate with the stator frame 111 to fix the suppressing material 123b. The suppressing material 123b may be the same as or different from the material of the suppressing material 123.

[0058] Therefore, the suppression module 120b can reduce or prevent at least one type of parasitic current and improve the operation of the electric drive system 100b.

[0059] Figure 6 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0060] For ease of description, additional descriptions related to the components described above will be omitted below to avoid redundancy. References Figure 6 The electric drive system 100c may include a motor 110c, a suppression module 120c, a coupling 130, a lubrication system 140, a busbar 150, an inverter 160, and an electronic data processing system 170. The motor 110c may include a stator frame 111, a stator winding 113, a rotor 115c, a shaft 117, and a bearing 119.

[0061] In some exemplary embodiments, the suppression module 120c is mounted on a shaft 117 within the rotor 115c. Except that the suppression module 120c is located within the rotor 115c, the rotor 115c may be identical or similar to the rotor 115. In some exemplary embodiments, the length of the suppression module 120c in the first direction X may be entirely within the rotor 115c. In some exemplary embodiments, at least one outer surface of the suppression module 120c facing the first direction X may be coplanar or substantially coplanar with the outer surface of the rotor 115c facing the first direction X. In some exemplary embodiments, the suppression module 120c may extend along the shaft 117 beyond at least one outer surface of the rotor 115c facing the first direction X. The suppression module 120c may be centered within the rotor 115c in the first direction X, or it may be offset to either side of the center of the rotor 115c.

[0062] The suppression module 120c may include a retainer 121c and a suppression material 123c. Except that the suppression module 120c is located within the rotor 115c, the suppression module 120c may be the same as or similar to the suppression module 120.

[0063] In some exemplary embodiments, the suppressing material 123c may have an annular shape, with its inner periphery larger than the outer periphery of the shaft 117, such that the suppressing material 123c surrounds the shaft 117. In some exemplary embodiments, the inner periphery of the suppressing material 123c may have a shape that is the same as but larger than the profile of the shaft 117, a shape that closely matches the profile of the shaft 117, or the inner periphery of the suppressing material 123c may have a different shape in its profile (e.g., a toothed circle, an ellipse). In some exemplary embodiments, the retainer 121c may be a housing for retaining the suppressing material 123c; however, the retainer 121c may alternatively be a frame, cage, and / or support for retaining the suppressing material 123c. In some exemplary embodiments, the retainer 121c may cooperate with the rotor 115c to secure the suppressing material 123c. In some exemplary embodiments, the retainer 121c may not be included, and the rotor 115c may secure the suppressing material 123c. The suppressing material 123c may be the same as or a different material from the suppressing material 123.

[0064] Therefore, the suppression module 120c can reduce or prevent at least one type of parasitic current and improve the operation of the electric drive system 100c.

[0065] Figure 7 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0066] For ease of description, additional descriptions related to the components described above will be omitted below to avoid redundancy. References Figure 7The electric drive system 100d may include a motor 110, a suppression module 120d, a coupling 130, a lubrication system 140, a busbar 150, an inverter 160, and an electronic data processing system 170.

[0067] In some exemplary embodiments, the suppression module 120d may be located on the busbar 150 between the stator frame 111 of the motor 110 and the inverter 160. The suppression module 120d may include a retainer 121d and a suppression material 123d. Except that the suppression module 120d is coupled to the busbar 150, the suppression module 120d may be the same as or similar to the suppression module 120.

[0068] In some exemplary embodiments, the suppressing material 123d may have an annular shape, with its inner periphery larger than the outer periphery of the busbar 150, such that the suppressing material 123d surrounds the busbar 150. In some exemplary embodiments, the inner periphery of the suppressing material 123d may have a shape that is the same as but larger than the contour of the busbar 150, a shape that closely matches the contour of the busbar 150, or the inner periphery of the suppressing material may have a different shape in its contour (e.g., a toothed circle, an ellipse). In some exemplary embodiments, the retainer 121d may be a housing for retaining the suppressing material 123d; however, the retainer 121d may alternatively be a frame, cage, and / or support for retaining the suppressing material 123d. The suppressing material 123d may be the same as or a different material than the suppressing material 123.

[0069] In some exemplary embodiments, the suppression module 120d may be adjacent to (e.g., directly adjacent to) the inverter 160, adjacent to (e.g., directly adjacent to) the stator frame 111, or between the inverter 160 and the stator frame 111. In some exemplary embodiments, the suppression module 120d is fixed to one of the inverter 160 or the stator frame 111, or the suppression module 120d may be slidable along the busbar 150.

[0070] Therefore, the suppression module 120d can reduce or prevent at least one type of parasitic current and improve the operation of the electric drive system 100d.

[0071] Figure 8 The illustration shows an electric drive system for an electric motor according to some exemplary embodiments.

[0072] For ease of description, additional descriptions related to the components described above will be omitted below to avoid redundancy. References Figure 8The electric drive system 100e may include a motor 110, a suppression module 120e, a coupling 130, a lubrication system 140, a busbar 150, an inverter 160e, and an electronic data processing system 170. The inverter 160e may include a circuit 161e (not shown) and wiring 163e (not shown), the circuit 161e being configured to receive / send commands to control the electric drive system 100e, and the wiring 163e being used to connect the circuit 161e to the busbar 150.

[0073] In some exemplary embodiments, the suppression module 120e may be located in the inverter 160e, between the frame of the inverter 160e and the circuitry of the inverter 160e, for example, on wiring 163e. The suppression module 120e may include a retainer 121e and a suppression material 123e. Except that the suppression module 120e is coupled to the inverter 160e, the suppression module 120e may be the same as or similar to the suppression module 120.

[0074] In some exemplary embodiments, the suppression material 123e may have an annular shape, with its inner periphery larger than the outer periphery of the wiring 163e, such that the suppression material 123e surrounds the wiring 163e. In some exemplary embodiments, the inner periphery of the suppression material 123e may have a shape that is the same as but larger than the contour of the wiring 163e, a shape that closely matches the contour of the wiring 163e, or the inner periphery of the suppression material 123e may be a shape that is different in contour (e.g., a toothed circle, an ellipse). In some exemplary embodiments, the retainer 121e may be a housing for retaining the suppression material 123e; however, the retainer 121e may alternatively be a frame, cage, and / or support for retaining the suppression material 123e. In some exemplary embodiments, the retainer 121e may cooperate with the frame of the inverter 160e to secure the suppression material 123e. The suppression material 123e may be the same as or a different material from the suppression material 123.

[0075] Therefore, the suppression module 120e can reduce or prevent at least one type of parasitic current and improve the operation of the electric drive system 100e.

[0076] Although the diagrams have been separated Figures 1 to 8 The exemplary embodiments are as described, but the suppression modules 120 to 120e (and support features) can be combined in various different ways. For example, the electric drive system may include one or more of the suppression modules 120 to 120e. For example, the electric drive system may include various suppression modules 120 to 120e along shaft 117 (except where the shaft is held by bearing 119), along coupling 130, along connecting shaft 137, along busbar 150, and in inverter 160.

[0077] Figure 9 The illustration shows a vehicle including an electric motor according to some exemplary embodiments.

[0078] For ease of description, additional descriptions related to the components described above will be omitted below to avoid redundancy. References Figure 9 In some exemplary embodiments, vehicle 900 may include a drive system 9100, a ground engagement element 920, and a steering module 930. Vehicle 900 may be, for example, a tractor, combine harvester, lawnmower, etc. Drive system 9100 may be an electric drive system (e.g., 100 to 100e) including at least one of suppression modules 120 to 120e. Drive system 9100 may provide power to and propel ground engagement element 920. In some exemplary embodiments, ground engagement element may be a wheel, track, tire, etc. Steering module 930 may guide ground engagement element 920 to control the movement of vehicle 900.

[0079] When the terms “about” or “substantially” are used in conjunction with numerical values ​​in this specification, the numerical values ​​to be associated include manufacturing or operational tolerances (e.g., ±10%) around the stated numerical values. Furthermore, when the terms “approximately” and “substantially” are used in conjunction with geometry, it is intended not to require precision in the geometry, but rather that the degrees of freedom of the shape be within the scope of this disclosure. Moreover, regardless of whether numerical values ​​or shapes are modified to “about” or “substantially,” it will be understood that these values ​​and shapes should be interpreted as including manufacturing or operational tolerances (e.g., ±10%) around the stated numerical values ​​or shapes.

[0080] Although this disclosure has been described with reference to embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made to this disclosure without departing from the spirit and scope of the disclosure as set forth in the appended claims.

Claims

1. An electric motor assembly (110), comprising: Power source (160); An electric motor (110), configured to be driven by the power source (160), the electric motor (110) comprising: -Stator frame (111) - Stator windings (113) attached to the stator frame (111). - The rotor (115) is surrounded by the stator winding (113). - A shaft (117) extending from the rotor (115) through the stator frame (111), and - A bearing (119) located between the shaft (117) and the stator frame (111); and Suppression material (123), the suppression material is on the shaft.

2. The motor assembly according to claim 1, wherein, The suppression material (123) is a ferrite material.

3. The motor assembly according to claim 1, wherein, The suppressing material (123) has an annular shape that completely surrounds a portion of the shaft.

4. The motor assembly according to claim 1, wherein, The suppression material (123) is separated from the rotor (115) by a first distance, the first distance being determined based on the magnitude of the magnetic field generated by the suppression material (123).

5. The motor assembly according to claim 1, wherein, The suppressing material (123) runs along the shaft (117), and the bearing (119) is located between the suppressing material (123) and the rotor (115).

6. The motor assembly according to claim 1, wherein, The suppressing material (123) is located along the shaft (117) between the bearing (119) and the rotor (115).

7. The motor assembly according to claim 6, further comprising another damping material (123) located along the shaft (117) between the bearing (119) and the rotor (115), opposite to the damping material (123).

8. The motor assembly according to claim 1, wherein, The suppressing material (123) is along the shaft (117) and within the rotor (115).

9. The motor assembly of claim 1 further includes a lubrication system (140) configured to dissipate heat from the electric motor (110) and the damping material (123) and reduce friction between the electric motor (110) and the damping material (123).

10. A motor drive system (100), comprising: An electric motor assembly (110) includes an electric motor (110) configured to be driven by a power source (160), the electric motor (110) comprising: -Stator frame (111) - Stator windings (113) attached to the stator frame (111). - The rotor (115) is surrounded by the stator winding (113). - A shaft (117) extending from the rotor (115) through the stator frame (111), and - A bearing (119) located between the shaft (117) and the stator frame (111). Transmission device (1370), the transmission device including transmission device shaft (137). Coupling (130), which connects the shaft (117) to the transmission shaft (137); and Suppression material (123).

11. The motor drive system (100) according to claim 10, wherein, The suppression material (123) is a ferrite material. The suppressing material (123) has an annular shape that completely surrounds a portion of the coupling (130), and The suppressing material is separated from the coupling (130) by a lubricant (141).

12. The motor drive system according to claim 10, wherein, The suppressing material (123) runs along the shaft (117), and the bearing (119) is located between the suppressing material (123) and the rotor (115).

13. The motor drive system according to claim 10, wherein, The suppressing material (123) is located along the shaft (117) between the bearing (119) and the rotor (115).

14. The motor drive system according to claim 10, wherein, The suppressing material (123) is on the coupling (130) between the electric motor (110) and the transmission device (1370).

15. The motor drive system according to claim 10, wherein, The suppressing material (123) is along the shaft (117) and within the rotor (115).

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