Circuit holder for stator of resolver
By increasing the creepage distance between the rotary transformer contacts and using the molding process to manufacture the circuit holder, the short circuit and accuracy reduction caused by corrosive fluids are solved, and cost reduction and accuracy improvement are achieved.
Patent Information
- Application Number
- CN202410869127.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-07-04
- Filing Date
- 2024-07-01
- Publication Date
- 2025-01-10
AI Technical Summary
When using corrosive fluids, especially ATFs, the conductive circuit is easily formed due to the electrogenic cell effect and copper sulfide deposition, resulting in reduced accuracy and short circuits. The existing solutions are costly and cannot meet the market price.
By increasing the creepage distance between the first contact and the second contact to greater than or equal to 4 mm, a circuit holder is manufactured using a molding process, including forming a recess or protrusion on the mounting surface to clamp the contact and passing through the wall or Trench increases creepage distance, reduces short circuit risk, and reduces costs.
It effectively reduces the risk of rotary transformer short circuit in corrosive fluid environments, improves accuracy and life, while reducing manufacturing costs and minimizing installation space.
Smart Images
Figure CN119298476A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a circuit holder for a stator of a rotary transformer, a method for manufacturing such a circuit holder and the use of a stator comprising such a circuit holder. Background Art
[0002] A resolver is a rotating electrical transformer used to measure the angle of rotation. For example, a resolver is a reluctance resolver, which may look like a small electric motor with a stator and a rotor. Internally, the configuration of the coil wire windings makes it different. The stator part of the resolver houses three coils: an exciter coil and two two-phase coils. Further details of the resolver are known to those skilled in the art.
[0003] Rotary transformers are used in many technical fields. In some fields, rotary transformers are used in devices that come into contact with corrosive fluids. For example, in the field of motors (e.g. electric motors), specific cooling liquids, such as oils, such as automatic transmission fluid (ATF), which is a hydraulic fluid used in vehicles with automatic transmissions, can be used. ATF is optimized for the special requirements of the transmission, such as valve operation, brake band friction and torque converter and gear lubrication. Typically, ATF consists of a base oil plus an additive package that includes various chemical compounds designed to provide the desired properties of a specific ATF specification.
[0004] When ATF is used to cool the motor, the ATF gets hot. When time and temperature are too high, the oil properties may change, and the oil (it should be the oil, not the coil) may become corrosive, so the ATF may corrode the metal, for example, the bare contacts of the coil and the bare copper wire ends, and produce sulfides such as copper sulfide.
[0005] In combination with the galvanic cell effect, a conductive circuit can appear between the metal contacts. Typically, the galvanic cell effect has a remote relevance to rotary transformers. For example, the exciter coil is excited with a voltage oscillating between -Ve and +Ve. Therefore, the average voltage potential Ve is 0V. In response, the phase coil receives a voltage oscillating between -Vp and +Vp, i.e. the average phase voltage potential Vp is 0V. Therefore, the potential difference is zero.
[0006] However, it has been observed that users sometimes shift the potential of the phase coil to a range between 0V and Vmax. Therefore, if the user receives a signal with 0V or Vmax, the user can recognize a fault in the phase coil. For example, the user shifts the voltage by connecting a resistor to the contacts connecting the phase coil.
[0007] However, this potential additional offset results in the potential of the phase coil Vp averaging to (Vmax-V0) / 2. In combination with corrosive oil, the oil may corrode the bare Cu of the coil wire and / or contacts and produce copper sulfide. Combined with the galvanic effect, this copper sulfide may be deposited on the surface between the contacts and a conductive circuit may appear between the contacts.
[0008] In more detail, with different electrode potentials for the phase coil and the exciter coil, two or more contacts can be in contact in the electrolyte, with one contact acting as the anode and the other contact acting as the cathode. The potential difference between the two contacts is the driving force for accelerated corrosion on the anode contact, which dissolves into the electrolyte. This causes the metal at the anode to corrode faster than it would otherwise, and corrosion at the cathode is suppressed. For example, the contacts at the phase coil tend to corrode faster because they are at a high potential. This increases the likelihood of the appearance of a conductive circuit, which starts to grow at each contact of the phase coil.
[0009] However, such conductive circuits are very problematic for resolvers. When the resistance between the resolver circuits becomes too low, the resolver no longer meets accuracy. In other words, a short circuit is created between the contacts of the phase coils. A short circuit is a circuit that allows current to flow along an unintended path with no or very low electrical impedance.
[0010] The prior art is that the contacts are provided with epoxy sealants (potting), which can be applied in the contact area to protect the contacts and the contact welding area. However, this is a high-cost process solution. In particular, the rotary transformer with potting may not meet the market price. Summary of the invention
[0011] The object of the invention is to provide a solution for a resolver which allows to reduce costs. Another object is to minimize the installation space. Furthermore, especially in oil applications, the performance of the resolver should be improved, especially in terms of accuracy.
[0012] This object is solved by the independent claim. Advantageous embodiments are solved by the dependent claims.
[0013] According to a general example, the creepage distance between the first contact and the second contact is increased to be greater than or equal to 4 mm. The creepage distance is the shortest distance between the first contact and the second contact along the mounting surface of the circuit holder. Therefore, when the mounting surface contacts a fluid suitable for creating a conductive path between the first contact and the second contact, a larger creepage distance reduces the possibility of creating a short circuit between the first contact and the second contact. Even if the oil is manufactured to avoid the creation of a conductive path, this does not always work as expected depending on the temperature. Therefore, the fluid may occasionally create a conductive path.
[0014] More specifically, a first aspect relates to a circuit holder for a stator of a rotary transformer. The circuit holder is used to couple the coils of the rotary transformer to a circuit. The circuit (eg, a microcomputer) includes electronic devices for operating the rotary transformer.
[0015] The circuit retainer includes a main body portion having a mounting surface. The mounting surface is an outer layer or top layer of the circuit retainer. For example, the main body portion of the circuit retainer is a molded component. In particular, the main body portion is made of an insulating material so that the main body portion can support the conductive portion.
[0016] The first contact holder is arranged at the mounting surface. The holder is a recess or protrusion formed in the mounting surface. For example, the holder is formed integrally with the main body as a molded component. Therefore, the main body can be manufactured economically.
[0017] The first contact holder clamps the first contact. Clamping means that two parts, namely the contact and the body part, can be connected by putting them together. In particular, the connection can be reversible. Such a clamping connection is particularly economical, because the two parts can be manufactured separately and after manufacturing each part separately, the two parts can be connected. This avoids cost-intensive processes, such as, for example, processes such as overmolding the contact.
[0018] The first contact may be a blank electric contact, for example comprising copper. The contact is used to connect a first terminal of the rotary transformer to an electrical circuit. For example, the first terminal is a first end of a phase coil or a first end of an exciter coil.
[0019] In addition, according to the first aspect, the circuit holder includes a second contact holder, which clamps a second contact for connecting the second terminal to the circuit. For the description of the second contact holder and the second contact, reference is made to the above description of the first contact holder and the first contact. For example, the second terminal is the second end of the phase coil.
[0020] In addition, the first contact holder is adjacent to the second contact holder. Here, adjacent means that the first contact holder is next to the second contact holder. In other words, each first contact holder can have a maximum of two adjacent second contact holders, which are both next to the first contact holder.
[0021] As mentioned above, the creepage distance between the first contact and the second contact is greater than or equal to 4 mm. Traditionally, the distance between the first contact and the second contact is reduced. The distance is usually 3 mm or less. The contact spacing gives this short distance of 3 mm. The contact spacing is defined as the distance between two adjacent contacts. For example, the distance between the first end and the second end of the phase coil is an example of the contact spacing. In this case, the contact spacing is also referred to as the coil spacing. In addition, the distance between the second end of the phase coil and the first end of the exciter coil is an example of the contact spacing. By increasing the contact spacing, the creepage distance avoids the occurrence of short circuits caused by electrical corrosion processes.
[0022] In the following, as an example, the first contact is used to connect the first end of the phase, and the second contact is used to connect the second end of the phase coil. Alternatively, not described in detail, the first contact is used to connect the second of the phase coils, and the second contact is used to connect the first end of the exciter coil.
[0023] The first way to increase the creepage distance is to increase the contact spacing to a value greater than the minimum value usually chosen. This solution is a particularly economical one.
[0024] Preferably, the contact spacing (i.e., gap distance) is less than or equal to 20 mm. Such an upper limit minimizes the installation space of the rotary transformer. The gap distance is the shortest distance between the first contact and the second contact along an imaginary line directly connecting the first contact and the second contact. As used herein, a line is referred to by two points located thereon (i.e., the first contact and the second contact). A direct connection refers to a connection that can pass through any material.
[0025] Preferably, the creepage distance between the first contact and the second contact is greater than or equal to 5.75 mm. Even more preferably, the creepage distance between the first contact and the second contact is greater than or equal to 6.5 mm. Additionally or alternatively, the gap distance is preferably less than or equal to 15 mm. Even more preferably, the gap distance is less than or equal to 10 mm.
[0026] As an addition to the first aspect, according to the second aspect, the gap distance between the first contact and the second contact may be shorter than the creepage distance. A gap distance shorter than the creepage distance reduces the installation space of the rotary transformer. Preferably, the gap distance is less than or equal to 4 mm. Even more preferably, the gap distance is greater than or equal to 2 mm.
[0027] In other words, the creepage distance is increased by structural modification of the mounting surface. Such structural modifications are the subject of the third to sixth aspects. All these solutions allow particularly simple manufacturing, for example by moulding the body part with the modified mounting surface.
[0028] As an addition to the second surface, according to a third aspect, the circuit retainer includes a wall protruding from the mounting surface, the wall being used to increase the creepage distance compared to the gap distance. As used herein, a wall is a structure protruding from the mounting surface. For example, the wall is arranged between the adjacent first contact and the second contact. For example, a portion of the wall can be integrally formed with one of the first contact retainer and the second contact retainer.
[0029] As an addition to any of the second and third aspects, according to a fourth aspect, the circuit retainer includes a groove formed in the mounting surface, the groove being used to increase the creepage distance compared to the gap distance. As used herein, the groove is a recessed structure in the mounting surface. For example, the groove is arranged between the adjacent first contact and the second contact. For example, a portion of the groove can be formed integrally with one of the first contact retainer and the second contact retainer.
[0030] As an addition to any of the second to fourth aspects, according to a fifth aspect, the gap distance between the first contact and the second contact is less than or equal to 5 mm. This solution allows for a reduced installation space. In particular, the gap distance is greater than or equal to 3 mm. As described above, the contact spacing is at least 3 mm, so that for the rotary transformer, a further reduction in the gap distance is not necessary.
[0031] As an addition to any of the second to fifth aspects, according to a sixth aspect, the circuit retainer further comprises a mating piece having an inner surface, the inner surface being opposite to the mounting surface, wherein the mating piece comprises a spacer protruding from the inner surface, the spacer being used to increase the creepage distance compared to the clearance distance. In other words, the circuit retainer comprises a main body portion having a mounting surface and a mating piece, the mating piece being considered as a cover. Such a mating piece further avoids the need for potting material. In particular, both the main body portion and the mating piece may comprise a clamping portion for clamping the mating piece to the main body portion. In this way, the two components may be manufactured economically, for example by a potting process.
[0032] As an addition to any of the aforementioned aspects, according to the seventh aspect, the circuit retainer also includes a first x-phase contact retainer and a second x-phase contact retainer, the first x-phase contact retainer clamping for connecting the first end of the x-phase coil to the first x-phase contact of the circuit, and the second x-phase contact retainer clamping for connecting the second end of the x-phase coil (210) to the second x-phase contact of the circuit. In addition, the circuit retainer includes a first exciter contact retainer and a second exciter contact retainer, the first exciter contact retainer clamping for connecting the first end of the exciter coil to the first exciter contact of the circuit, and the second exciter contact retainer clamping for connecting the second end of the exciter coil to the second exciter contact of the circuit, wherein the creepage distance is the creepage distance between the first x-phase contact and the second x-phase contact. Additionally or alternatively, the creepage distance is the distance between the second x-phase contact and the first exciter contact. In addition, the exciter creepage distance between the first exciter contact and the second exciter contact is less than the creepage distance. As described above, the potential of the actuator contacts may be 0 V on average, and therefore, the possibility of galvanic corrosion occurring at the actuator contacts is reduced. Therefore, the creepage distance between the actuator contacts may be reduced, and thus the installation space may be minimized.
[0033] As an addition to the seventh aspect, according to the eighth aspect, the circuit retainer also includes a first y-phase contact retainer and a second y-phase contact retainer, the first y-phase contact retainer clamping the first end of the y-phase coil to the first y-phase contact of the circuit, and the second y-phase contact retainer clamping the second end of the y-phase coil to the second y-phase contact of the circuit; wherein the first exciter contact and the second exciter contact are arranged between the first contact and the first y-phase contact. As described above, the potential of the exciter contact may be 0V on average, and therefore, the possibility of galvanic corrosion at the exciter contact is reduced. Therefore, the creepage distance between the exciter contacts can be reduced, so that the installation space can be minimized.
[0034] As an addition to any of the preceding aspects, according to a ninth aspect, at least one of the first contact and the second contact is a forked contact having a slot for receiving the end of the conductor of the phase coil in the slot. Preferably, all of the above contacts have a forked contact. This is a particularly simple solution for connecting the coil end conductors, which further reduces manufacturing costs. In addition, the forked contact surrounds the bare copper of the coil end conductors, which reduces the contact of the bare copper with corrosive fluids, thereby further reducing the possibility of corrosion. In addition, the forked contact allows for insulation displacement contacts, which cut the insulator when the wire is inserted. Therefore, the portion of bare copper is reduced.
[0035] It is worth noting that at least one of the above contacts, in particular the first contact and the second contact, is a stamped and bent metal sheet that includes a protective layer to further reduce bare metal that may contribute to the corrosion process.
[0036] As an addition to any of the previous aspects, according to a tenth aspect, the circuit holder is formed by a molding process, and wherein the first contact and the second contact are not over-molded. Advantageously, the contacts are releasably clamped. This further reduces manufacturing costs.
[0037] The eleventh aspect relates to a stator of a rotary transformer. The stator includes a circuit retainer according to any one of the first to tenth aspects. The stator also includes a phase coil, wherein a first contact connects a first end of the phase coil to the circuit, and a second contact connects a second end of the phase coil to the circuit. The phase coil may be referred to as an x-phase coil hereinafter. In addition, the stator also includes an exciter coil, wherein a first exciter contact connects a first end of the exciter coil to the circuit, and a second exciter contact connects a second end of the exciter coil to the circuit. In addition, the stator includes a y-phase coil, wherein a first y-phase contact connects a first end of the y-phase coil to the circuit, and a y-second phase contact connects a second end of the phase coil to the circuit.
[0038] A twelfth aspect relates to a method for manufacturing a circuit holder of a stator of a rotary transformer, the method comprising the following steps:
[0039] forming a circuit holder including a first contact holder and a second contact holder disposed at a mounting surface of the circuit holder;
[0040] clamping the first contact and the second contact of the circuit to the first contact holder and the second contact holder, respectively;
[0041] The creepage distance between the first contact and the second contact is greater than or equal to 4 mm, and the creepage distance is the shortest distance between the first contact and the second contact along the mounting surface of the circuit holder. The creepage distance is used to avoid a short circuit between the first contact and the second contact when the mounting surface contacts a corrosive fluid.
[0042] Additionally, the method may include the steps of forming a device for holding the circuit, and mounting the circuit to the device for holding the circuit.
[0043] Other aspects of the method can be derived based on the above description of the aforementioned aspects.
[0044] A thirteenth aspect relates to a method for manufacturing a circuit retainer according to the twelfth aspect, wherein the method also includes forming a wall protruding from the mounting surface, the wall being used to increase the creepage distance compared to the gap distance, and / or forming a groove in the mounting surface, the wall being used to increase the creepage distance compared to the gap distance.
[0045] A fourteenth aspect relates to the use of a stator according to any one of the tenth or eleventh aspects, wherein the first contact and the second contact are exposed to a corrosive fluid. In other words, the first contact and / or the second contact are not protected by a housing or potting material from the corrosive material.
[0046] A fifteenth aspect relates to the use of a stator according to any one of the tenth or eleventh aspect, wherein the first contact and the second contact are exposed to an automatic transmission fluid. BRIEF DESCRIPTION OF THE DRAWINGS
[0047] The invention will now be described in more detail in an exemplary manner using advantageous aspects and with reference to the accompanying drawings. The described aspects are only possible configurations, however, in which the individual features described above may be provided independently of each other or may be omitted.
[0048] The accompanying drawings are incorporated into the specification and form a part of the specification to illustrate several embodiments of the present invention. These drawings, together with the specification, are used to explain the principles of the present invention. The accompanying drawings are only used to illustrate the purpose of preferred and alternative examples of how to make and use the present invention, and should not be interpreted as limiting the present invention to only the embodiments shown and described. In addition, several aspects of the embodiments can form solutions according to the present invention individually or in different combinations. Therefore, the embodiments described below can be considered individually or in any combination thereof.
[0049] The described embodiments are merely possible configurations, and it must be remembered that, in implementing the invention, the various features described above may be provided independently of one another, or may be omitted entirely. Further features and advantages will become apparent from the following more detailed description of various embodiments of the invention as illustrated in the accompanying drawings, in which like reference numerals refer to like elements, and in which:
[0050] In the accompanying drawings,
[0051] Figure 1 A stator of a rotary transformer according to a first example;
[0052] Figure 2 Figure 1 Part II;
[0053] Figure 3 Schematic diagram showing the difference between clearance distance and creepage distance caused by the groove;
[0054] Figure 4 a schematic diagram showing the difference between the clearance distance and the creepage distance caused by a wall; and
[0055] Figure 5 Schematic diagram of a circuit holder according to a second example.
[0056] Figure 6 A flow chart for manufacturing a circuit holder according to one example. DETAILED DESCRIPTION
[0057] Figure 1 A schematic diagram of a stator 10 of a rotary transformer is shown. The stator 10 includes a circuit holder 100. The circuit holder 100 includes a main body portion for holding an electrical connection portion, which is used to connect a coil not shown to a circuit not shown. In addition, the circuit holder 100 according to this example includes a coil protrusion 200 for holding a coil not shown, and a receiving recess is formed in the circuit holder 100, which holds a laminate stack 300. The coil protrusion 200 can be formed integrally with the circuit holder 100.
[0058] Figure 2 Shows Figure 1 Details Figure 2 . The circuit holder 100 includes a mounting surface 110. Protruding contact holders 120_1, 120_2, ..., 120_6 protrude from the mounting surface 110. In addition, a plurality of recesses are formed in the mounting surface 110, each recess forming a recessed contact holder, such as the recessed contact holder 122_2. Each contact holder, i.e., the protruding contact holder and the recessed contact holder, is formed substantially in a direction perpendicular to the mounting surface 110. A molding process can be used to form the circuit holder 100 having vertical protruding / recessed contact holders. In particular, a recess is formed in a direction toward the circuit surface 112, which is opposite to the mounting surface 110.
[0059] In addition, the circuit holder 100 includes a plurality of contacts, such as contacts 130_1 and 130_2, ..., 130_6, that is, six contacts. Each contact has a coil end (such as the coil end 132_3) and a circuit end (such as the circuit end 134_3).
[0060] The coil end 132_3 is used to receive the wire of the coil not shown. In particular, the coil end 132_3 is a fork-shaped contact with a slot, which is used to receive the end of the wire of the coil in the slot. Since stripping the insulation from the wire is time-consuming, the coil end is quickly assembled using a fork-shaped end, that is, through a fork, which is a kind of insulation displacement contact that cuts the insulation when the wire is inserted. The slot of the fork opening in the coil end (the insulated wire is welded to the slot) cuts through the insulation to contact the conductor. Considering corrosive fluids, this connection is particularly important because the ratio of bare wire to insulated copper wire used to contact the coil is reduced.
[0061] The circuit end 134_3 extends in a through hole 140 formed in the circuit holder 100. Therefore, the circuit end 134_3 can be contacted via the through hole 140. In particular, the circuit not shown is mounted at the circuit surface 112. This arrangement is advantageous because the through hole 140 prevents the circuit from growing due to corrosive fluids, as described below.
[0062] Advantageously, each contact is formed as a one-piece component. In particular, each contact is formed by stamping and bending a metal sheet. This is a cost-effective solution for manufacturing the contacts and at the same time allows to reduce the proportion of exposed bare metal of the contact surface relative to the insulating metal. Such contacts are particularly important in view of corrosive fluids, since the proportion of bare metal of the contact relative to the insulating metal is reduced.
[0063] In addition, the contact holders 120, 122 clamp the contacts 130. Thus, the circuit holder 100 can connect the coils (i.e., phase coils, exciter coils) and the circuit. Clamping is a particularly cost-effective production method compared to, for example, overmolding the contacts. However, by overmolding, the surface of the contacts exposed to the corrosive fluid can be reduced. Considering the use of clamping, corrosion-related effects must be considered more carefully.
[0064] In view of the presence of corrosive fluids, this document proposes increasing the creepage distance between adjacent contacts connecting the phase coils.
[0065] like Figure 3 and Figure 4 As shown, the creepage distance 152 is the shortest distance between the first contact 130_1 and the second contact 130_2 along the mounting surface 110. In addition, the gap distance 154 between the first contact 130_1 and the second contact 130_2 is the shortest distance between the first contact 130_1 and the second contact 130_2 along an imaginary line directly connecting the first contact 130_1 and the second contact 130_2. Figure 3 As shown, the groove 156 formed in the mounting surface increases the creepage distance 152 compared to the clearance distance 154. Figure 4 In the example shown, the wall 158 protruding from the mounting surface 110 increases the creepage distance 152 compared to the clearance distance 154 .
[0066] like Figure 2 As shown in the example of FIG. 1 , a plurality of walls (eg, wall 158_1) are arranged between adjacent contacts. Each wall protrudes substantially vertically from the mounting surface 110. A molding process can be used to form the circuit holder 100 having the vertically protruding walls 158 and the contact holder described above.
[0067] Examples of grooves are through-holes 140 disposed at the circuit end of the contact (e.g., circuit end 134_3), and grooves 156_1 disposed at the coil end of the contact (e.g., coil end 132_3). A molding process can be used to form a circuit holder 100 having vertically recessed grooves and the contact holders and walls described above.
[0068] In particular, the creepage distance can be increased by simply spacing the contacts 130_1 and 130_2 apart from each other. In particular, the gap distance is greater than or equal to 3 mm, which is the minimum contact spacing typically used for rotary transformers. Thus, the effects of corrosion can be reduced at the expense of reduced installation space.
[0069] A creepage distance of 5 mm or more between the first contact 130_1 and the second contact 130_2 is sufficient to reduce the risk of a short circuit, even in an environment with a corrosive liquid, to achieve a long resolver life and a high-precision measurement result. In particular, when the mounting surface 110 is in contact with a corrosive fluid, such a creepage distance prevents a short circuit from occurring between the first contact 130_1 and the second contact 130_2.
[0070] like Figure 2 As further shown in FIG. 1 , the wall and the groove allow the gap distance between the first contact and the second contact to be smaller than the creepage distance. Advantageously, the gap distance is less than or equal to 5 mm.
[0071] Even in Figure 2 Not shown in the figure, the circuit holder 100 can also be covered with a mating piece not shown. The mating piece has an inner surface, which is opposite to the mounting surface 110, wherein the mating piece includes a spacer protruding from the inner surface, which is used to increase the creepage distance compared to the clearance distance. For example, the spacer contacts the wall or mounting surface between the contacts.
[0072] Advantageously, the circuit holder 100 has a mating recess holder 162 and a mating protrusion holder 164, which are provided at the mounting surface 110 of the circuit holder for mounting a counterpart to the circuit holder 10. In addition, the circuit holder 100 may include a mating clip holder 166, which is arranged at a side surface connecting the mounting surface 110 and the circuit surface 112, for mounting a counterpart to the circuit holder.
[0073] In addition, if Figure 2As shown, the circuit holder 100 is suitable for holding an x-phase coil not shown, wherein the first x-phase contact 130_1 connects the first end of the x-phase coil not shown to the circuit, and the second x-phase contact 130_2 connects the second end of the x-phase coil not shown to the circuit. In addition, the circuit holder 100 is suitable for holding an exciter coil not shown, wherein the first exciter contact connects the first end of the exciter coil not shown to the circuit, and the second exciter contact connects the second end of the exciter coil not shown to the circuit. In addition, the circuit holder 100 is suitable for holding a y-phase coil not shown, wherein the first y-phase contact connects the first end of the y-phase coil to the circuit, and the y-second phase contact connects the second end of the phase coil to the circuit.
[0074] Figure 5 A schematic configuration of a circuit holder 100 having a coil is shown in FIG. In particular, Figure 5 Schematic examples of an x-phase coil 210 , a y-phase coil 220 , and an exciter coil 230 are shown.
[0075] As described above, in the case where the x-phase coil 210 has a fault, the user can connect the first contact 130_1 to the first resistor R1 to shift the potential of the first contact 130_1 to a predefined minimum value, such as a value of 0V. For example, the first resistor R1 is grounded. In addition, in the case where the x-phase coil 210 has a fault, the user can connect the second contact 130_2 to the second resistor R2 to shift the potential of the second contact 130_2 to a predefined maximum value, such as a value of 5V. For example, the second resistor R2 is connected to a potential of 5V. Therefore, in the case where a predefined maximum value or minimum value is detected, the user immediately knows that the coil 210 has a defect.
[0076] For the same reason, the contacts 130_5 and 130_6 of the y-phase coil 220 may be connected to similar resistors.
[0077] As described above, the coils 210, 220, 230 are subjected to an oscillating potential. Therefore, the phase contacts of this example are at an average potential of typically 2.5V, and the exciter contacts are at an average potential of 0V because the exciter contacts are not connected to a predefined resistance. Therefore, the creepage distances 212, 214, 222, 224, and 232 can be optimized based on the potential. In particular, the corrosion process occurs at a high potential of 2.5V, while the corrosion process does not occur at 0V.
[0078] The fact that the user may not monitor the exciter contacts can be used. In particular, the stator includes a first exciter contact 130_3 for connecting the first end of the exciter coil 230 to the circuit and a second exciter contact holder for clamping a second exciter contact 130_4 for connecting the second end of the exciter coil 230 to the circuit. The exciter creepage distance 232 between the first exciter contact 130_3 and the second exciter contact 130_4 can be smaller than the phase creepage distance 212 between the first contact 130_1 and the second contact 130_2. Therefore, the installation space can be reduced.
[0079] In addition, in view of the fact that the user may additionally monitor the y-phase coil 220, the first exciter contact 130_3 and the second exciter contact 130_4 can be arranged between the first contact 130_1 and the first y-phase contact. This makes it possible to reduce the intermediate creepage distances 214 and 224. In particular, the intermediate creepage distance can be smaller than the phase creepage distances 212, 222. Therefore, the installation space can be reduced.
[0080] Figure 6 A flow chart for manufacturing a circuit holder for a stator of a rotary transformer is shown.
[0081] The method comprises a step S2 of forming a circuit holder, the circuit holder comprising a first contact holder and a second contact holder arranged at a mounting surface of the circuit holder. In particular, the circuit holder may be formed by a molding process.
[0082] Furthermore, the method may include step S4: forming a wall protruding from the mounting surface, the wall being used to increase the creepage distance compared to the clearance distance, and / or forming a groove in the mounting surface, the groove being used to increase the creepage distance compared to the clearance distance. In particular, the circuit holder having the wall or the groove may be formed in one molding process.
[0083] In addition, the method includes a step S6 of clamping the first contact and the second contact of the circuit to the first contact holder and the second contact holder, respectively. The creepage distance between the first contact and the second contact is selected to be greater than or equal to 5 mm, the creepage distance being the shortest distance between the first contact and the second contact along the mounting surface of the circuit holder, and the creepage distance is used to avoid a short circuit between the first contact and the second contact when the mounting surface contacts a corrosive fluid.
[0084] The stator according to any of the above examples may be used in a corrosive fluid, in particular wherein the first contact and the second contact are exposed to the corrosive fluid. In particular, the first contact and the second contact may be exposed to an automatic transmission fluid.
[0085] Reference numerals
[0086]
Claims
1. A circuit holder (100) for a stator of a rotary transformer, the circuit holder (100) being used to connect a coil of the rotary transformer to a circuit, the circuit holder (100) comprising: a mounting surface (110), the mounting surface having a first contact holder (120_2) and a second contact holder (120_3), the first contact holder clamping a first contact (130_2) for connecting a first terminal of the rotary transformer to the circuit, the second contact holder clamping a second contact (130_3) for connecting a second terminal of the rotary transformer to the circuit, the first contact holder (120_2) being adjacent to the second contact holder (120_3); The creepage distance (152) between the first contact (130_2) and the second contact (130_3) is greater than or equal to 4 mm, and the creepage distance (152) is the shortest distance between the first contact (130_2) and the second contact (130_3) along the mounting surface (110) of the circuit holder (100). The creepage distance (152) is used to avoid a short circuit between the first contact and the second contact when the mounting surface (110) contacts a fluid that can generate a conductive path between the first contact (130_2) and the second contact (130_3).
2. The circuit holder (100) according to claim 1, wherein: A gap distance (154) between the first contact (130_2) and the second contact (130_3) is shorter than the creepage distance (152), and the gap distance (154) is the shortest distance between the first contact (130_2) and the second contact (130_3) along an imaginary line directly connecting the first contact (130_2) and the second contact (130_3).
3. The circuit holder (100) of claim 2, further comprising a wall (158) protruding from the mounting surface (110), the wall (158) being configured to increase the creepage distance (152) compared to the clearance distance (154).
4. The circuit holder (100) according to any one of claims 2 to 3, further comprising a groove (156) formed in the mounting surface (110), the groove (156) being used to increase the creepage distance (152) compared to the clearance distance (154).
5. The circuit holder (100) according to any one of the preceding claims, wherein: A gap distance (154) between the first contact (130_2) and the second contact (130_3) is less than or equal to 5 mm. Optionally, the gap distance (154) is greater than or equal to 3 mm.
6. The circuit holder (100) according to any one of the preceding claims, further comprising: A mating piece having an inner surface, the inner surface being opposite to the mounting surface (110), wherein the mating piece includes a spacer protruding from the inner surface, the spacer being used to increase the creepage distance (152) compared to the clearance distance (154).
7. The circuit holder (100) according to any one of the preceding claims, comprising: A first x-phase contact holder (120_1) and a second x-phase contact holder (120_2), wherein the first x-phase contact holder (120_1) is used to clamp a first x-phase contact (130_1) for connecting a first end of an x-phase coil (210) to the circuit, and the second x-phase contact holder (120_2) is used to clamp a second x-phase contact (130_2) for connecting a second end of the x-phase coil (210) to the circuit; A first exciter contact holder (120_3) and a second exciter contact holder (120_4), wherein the first exciter contact holder (120_3) clamps a first exciter contact (130_3) for connecting a first end of an exciter coil (230) to the circuit, and the second exciter contact holder (120_4) clamps a second exciter contact (130_4) for connecting a second end of the exciter coil (230) to the circuit; wherein the creepage distance (152) is at least one of a creepage distance between the first x-phase contact (130_1) and the second x-phase contact (130_2) and a creepage distance between the second x-phase contact (130_2) and the first exciter contact (130_3); Wherein, an exciter creepage distance (232) between the first exciter contact (130_3) and the second exciter contact (130_4) is smaller than the creepage distance (152).
8. The circuit holder (100) according to claim 7, further comprising: A first y-phase contact holder and a second y-phase contact holder, wherein the first y-phase contact holder is used to clamp a first end of a y-phase coil (220) to connect to a first y-phase contact of the circuit, and the second y-phase contact holder is used to clamp a second end of the y-phase coil (220) to connect to a second y-phase contact of the circuit; The first exciter contact (130_3) and the second exciter contact (130_4) are arranged between the first x-phase contact (130_1) and the first y-phase contact.
9. The circuit holder (100) according to any one of the preceding claims, wherein: At least one of the first contact (130_1) and the second contact (130_2) is a fork-shaped contact having a slot for receiving an end of a conductor of the phase coil in the slot.
10. The circuit holder (100) according to any one of the preceding claims, wherein: The circuit holder (100) is formed by a molding process, and wherein the first contact (130_1) and the second contact (130_2) are not overmolded, optionally wherein the contacts (130_1, 130_2) are releasably clamped.
11. A stator of a rotary transformer, comprising: The circuit holder (100) according to any one of claims 1 to 10; A phase coil (210), wherein the first x-phase contact (130_1) connects a first end of the phase coil to the circuit, and the second x-phase contact (130_2) connects a second end of the phase coil (210) to the circuit; an exciter coil (230), wherein a first exciter contact (130_3) connects a first end of the exciter coil to the circuit, and a second exciter contact (130_4) connects a second end of the exciter coil (230) to the circuit; and A y-phase coil (220) is provided, wherein a first y-phase contact connects a first end of the y-phase coil (220) to the circuit, and a second y-phase contact connects a second end of the y-phase coil (220) to the circuit.
12. A method for manufacturing a circuit holder for a stator of a rotary transformer, the method comprising the following steps: forming the circuit holder, the circuit holder comprising a first contact holder and a second contact holder disposed at a mounting surface of the circuit holder; clamping a first contact and a second contact of the circuit to the first contact holder and the second contact holder, respectively; Wherein, a creepage distance between the first contact and the second contact is greater than or equal to 5 mm, and the creepage distance is the shortest distance between the first contact and the second contact along the mounting surface of the circuit retainer, and the creepage distance is used to avoid a short circuit between the first contact and the second contact when the mounting surface contacts a corrosive fluid.
13. The method for manufacturing a circuit holder according to claim 12, wherein: The circuit holder further includes a wall protruding from the mounting surface and / or a groove formed in the mounting surface, the wall being used to increase a creepage distance compared to the clearance distance, and the groove being used to increase a creepage distance compared to the clearance distance.
14. Use of the stator according to claim 10, wherein: The first contact and the second contact are exposed to a corrosive fluid.
15. Use of the stator according to claim 10, wherein: The first contact and the second contact are exposed to automatic transmission fluid.