Motor variable frequency control device with high voltage interlocking function

Abstract

The utility model relates to motor technical field, concretely relates to a motor frequency control device with high pressure interlock function, include: motor main part has rear end cover and junction box, the junction box includes box and box lid, high pressure interlock switch is fixedly installed in the box inboard, navigation plug, fixedly installed in the rear end cover, frequency converter, wherein, high pressure interlock switch is connected through mechanical linkage structure with the box lid, and high pressure interlock switch is connected through navigation plug and the interlock control loop of frequency converter series connection, to control the on-off of interlock control loop through the opening and closing action of box lid. The application controls the on-off of interlock control loop through the opening and closing action of box lid, when the junction box cover needs to be disassembled in the after-sales or test process, the interlock control loop is automatically disconnected, avoids the safety accident of the relevant personnel electric shock, improves the safety and reliability of motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a motor frequency conversion control device with high-voltage interlock function. Background Technology

[0002] With the rapid development of new energy vehicles, motors and motor controllers play an irreplaceable role as core components of the power system. In existing high-voltage motor systems, high-voltage interlock switches are often installed and connected in series with the motor's frequency converter control circuit to achieve high-voltage safety protection. When the high-voltage interlock switch is disconnected, the frequency converter control circuit is interrupted, and the motor stops running, thereby reducing safety risks.

[0003] However, the control of existing high-voltage interlock switch structures largely relies on manual operation and lacks linkage with the disassembly of the junction box cover. During after-sales maintenance or testing, if operators forget to manually disconnect the high-voltage interlock switch when disassembling the junction box cover, the interlock control circuit may still be in a conductive state. In this case, the high-voltage components are exposed, which can easily lead to electric shock to the operator, posing a safety hazard.

[0004] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0005] The purpose of this invention is to provide a motor frequency conversion control device with high-voltage interlock function.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A motor frequency converter control device with high-voltage interlock function includes:

[0008] The motor body has a rear end cover and a junction box, wherein the junction box includes a box body and a box cover;

[0009] A high-voltage interlock switch is fixedly installed inside the box.

[0010] The aircraft insert is fixedly installed on the rear end cover;

[0011] Frequency converter;

[0012] The high-voltage interlock switch is connected to the cover via a mechanical linkage structure, and the high-voltage interlock switch is connected in series with the interlock control circuit of the frequency converter via the aviation plug, so as to control the on / off state of the interlock control circuit through the opening and closing action (or opening and closing state) of the cover.

[0013] In the above scheme, the cover and the high-voltage interlock switch establish a trigger-based connection. Specifically, when the cover is closed, the high-voltage interlock switch outputs a resistance signal to the frequency converter; when the cover is open, the high-voltage interlock switch outputs a no-resistance signal to the frequency converter. The frequency converter controls the motor's operating status based on the received signal. For example, when a resistance signal is detected, the frequency converter controls the motor to start; when a no-resistance signal is detected, the frequency converter controls the motor to stop.

[0014] With the above settings, the effect is as follows:

[0015] On the one hand, the opening and closing of the junction box cover controls the on / off of the interlock control circuit. When the junction box cover needs to be removed during after-sales service or testing, the interlock control circuit automatically disconnects, avoiding electric shock accidents to relevant personnel and improving the safety and reliability of the motor.

[0016] On the other hand, in the prior art, the motor frequency converter control device includes a high-voltage connector, interlocking circuit, controller and protection device. The high-voltage connector also includes interlocking male and female terminals, etc., which is complex in structure. In contrast, the motor frequency converter control device used in this embodiment has the advantage of simple structure, thereby reducing structural cost, troubleshooting difficulty and maintenance cost.

[0017] It should be noted that the structures such as aviation plugs and frequency converters are existing, and their specific uses will not be described in detail in this embodiment. The specific arrangement (such as the position) of these structures will be adjusted according to actual needs in this embodiment.

[0018] The existing method of establishing a connection between the high-voltage interlock switch, the aviation connector, and the frequency converter can be referred to. For example, the two terminals of the high-voltage interlock switch are electrically connected to the corresponding pins of the aviation connector, and the other pin of the aviation connector is connected to the interlock control circuit of the frequency converter through a wire.

[0019] A further technical solution also includes a support structure, through which the high-voltage interlock switch is fixedly installed inside the box;

[0020] The length of the support structure is less than or equal to the height of the inner space of the box.

[0021] The support structure can use existing stroke supports.

[0022] The bracket structure can be customized according to the size of the high-voltage interlock switch and the internal space layout of the enclosure, solving problems such as size mismatch and space constraints that may occur when the high-voltage interlock switch is directly installed on the enclosure. For different models or specifications of high-voltage interlock switches, only the corresponding bracket needs to be replaced for installation, without the need to modify the enclosure itself, thus reducing the requirements for enclosure versatility.

[0023] The length of the support structure is less than or equal to the height of the inner space of the box to avoid affecting the sealing and fitting of the lid and the box body.

[0024] In a further technical solution, the mechanical linkage structure includes a metal spring, one end of which acts on the high-voltage interlock switch, and the other end of which acts on the cover.

[0025] The specific methods of achieving the above functions are not limited here; they can be achieved through threaded connections, hinges, etc.

[0026] There are no restrictions on the specific material of the metal shrapnel, as long as it meets the usage requirements.

[0027] When the cover is fixed to the box body, the cover presses against the metal spring first. If the metal spring is regarded as part of the high-voltage interlock switch, the cover will make full contact with the high-voltage interlock switch when it is closed, so that the interlock control circuit is formed.

[0028] When the high-voltage interlock switch is directly connected to the cover, the contact between the cover and the high-voltage interlock switch relies on the rigid collision or compression of the two. If the cover has slight deformation (such as warping after long-term use), it may lead to poor contact (such as the high-voltage interlock switch not being fully triggered), causing misjudgment of the interlock control circuit (such as the cover being closed but the interlock control circuit not being conductive). In this embodiment, the metal spring has elastic deformation capability and can compensate for the slight displacement or deformation of the cover through its own pre-tightening force, ensuring that the high-voltage interlock switch is stably triggered when the cover is closed, reducing the risk of "lack of connection".

[0029] In a further technical solution, the metal spring includes at least one arc-shaped segment.

[0030] Taking a metal spring consisting of only one arc-shaped segment as an example, this arc-shaped structure can meet different installation requirements. For instance, in one scenario, one end of the metal spring needs to be installed on the top side of the high-voltage interlock switch, while the other end needs to be positioned between the high-voltage interlock switch and the junction box cover. With this arc-shaped design, when the junction box cover is closed, the cover applies force to the arc-shaped metal spring, forcing it to deform. The deformed metal spring consistently applies an elastic force towards the trigger point of the high-voltage interlock switch, ensuring that the device does not disconnect during movement or vibration, thus increasing device stability. When the junction box cover is opened, the elastic restoring force of the metal spring causes it to quickly disengage from the trigger point of the high-voltage interlock switch as it returns to its initial state. This allows the inverter to stop the motor more quickly, further improving safety when removing the junction box cover.

[0031] A further technical solution is to install the aero-insertion on the side of the rear end cover along the radial direction of the motor body, so as to avoid increasing the axial dimension of the motor frequency converter control device and ensure the applicability of the motor frequency converter control device.

[0032] In a further technical solution, the box body and the box cover are threaded together;

[0033] At least one first threaded hole is provided at the upper end of each side wall of the box body;

[0034] The box cover has multiple second threaded holes corresponding to each of the first threaded holes.

[0035] The threaded connection is implemented using existing methods, such as bolt structures. The number and distribution of the second threaded holes are determined based on the first threaded holes.

[0036] When the first threaded hole is only made on one side wall of the box, all external forces will be concentrated on that side wall. Long-term vibration can easily lead to loosening of the bolt structure, stripping of the threads, or even deformation of the box side wall due to excessive local stress. In this embodiment, at least one first threaded hole is made on each side wall of the box, which can evenly distribute the external forces around the box and avoid the above-mentioned problems such as loosening of the bolt structure.

[0037] In a further technical solution, a plurality of first protrusions are formed on the outer surface of each side wall of the box body, and each first protrusion is provided with one of the first threaded holes;

[0038] The outer surface of each side wall of the box cover is provided with a plurality of second protrusions, and each second protrusion is provided with one of the second threaded holes.

[0039] Taking the first protrusion as an example, the second protrusion is illustrated in the same way:

[0040] On the one hand, by opening the first threaded hole on the first protrusion, the area where the first threaded hole is located can be locally reinforced, the material thickness at the first threaded hole can be increased, the load-bearing strength and fatigue resistance of the threaded connection can be effectively improved, and the failure problems such as deformation and stripping of the first threaded hole when the bolt is tightened or under long-term stress due to insufficient thickness of the side wall of the box can be avoided.

[0041] On the other hand, the first protrusion causes the first threaded hole to shift outward relative to the sealing mating surface of the box body (i.e. the mating surface between the box body and the lid), which can prevent the first threaded hole from being directly opened on the sealing mating surface and thus damage the integrity of the sealing mating surface, thereby improving the sealing reliability after the box body and lid are assembled.

[0042] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0043] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0044] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0045] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0046] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0047] The working principle and advantages of this utility model are as follows:

[0048] The enclosure cover and the high-voltage interlock switch establish a trigger-based connection. Specifically, when the enclosure cover is closed, the high-voltage interlock switch outputs a resistance signal to the frequency converter; when the enclosure cover is open, the high-voltage interlock switch outputs a no-resistance signal to the frequency converter. The frequency converter controls the motor's operating status based on the received signals. For example, when a resistance signal is detected, the frequency converter controls the motor to start; when a no-resistance signal is detected, the frequency converter controls the motor to stop.

[0049] With the above settings, the effect is as follows:

[0050] On the one hand, the opening and closing of the junction box cover controls the on / off of the interlock control circuit. When the junction box cover needs to be removed during after-sales service or testing, the interlock control circuit automatically disconnects, avoiding electric shock accidents to relevant personnel and improving the safety and reliability of the motor.

[0051] On the other hand, in the prior art, the motor frequency converter control device includes a high-voltage connector, interlocking circuit, controller and protection device. The high-voltage connector also includes interlocking male and female terminals, etc., which is complex in structure. In contrast, the motor frequency converter control device adopted in this application has the advantage of simple structure, thereby reducing structural cost, troubleshooting difficulty and maintenance cost. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the motor frequency conversion control device according to an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the structure of the motor body in an embodiment of the present utility model;

[0054] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0055] Figure 4 for Figure 3 Enlarged view of section B in the middle.

[0056] In the above attached diagrams: 1. Motor body; 11. Rear end cover; 12. Junction box; 121. Box body; 122. Box cover; 2. High-voltage interlock switch; 3. Aviation connector; 4. Frequency converter; 5. Bracket structure; 6. Metal spring; 7. First threaded hole; 8. Second threaded hole; 9. First protrusion; 10. Second protrusion. Detailed Implementation

[0057] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0058] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0059] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0060] See Figures 1-4 A motor frequency converter control device with high-voltage interlock function, comprising:

[0061] The motor body 1 includes a rear end cover 11 and a junction box 12, wherein the junction box 12 includes a box body 121 and a box cover 122;

[0062] The high-voltage interlock switch 2 is fixedly installed inside the housing 121;

[0063] The aircraft plug 3 is fixedly installed on the rear end cover 11;

[0064] 4. Frequency converter;

[0065] The high-voltage interlock switch 2 is connected to the cover 122 via a mechanical linkage structure, and the high-voltage interlock switch 2 is connected in series with the interlock control circuit of the inverter 4 via the aviation plug 3, so as to control the on / off of the interlock control circuit through the opening and closing action (or opening and closing state) of the cover 122.

[0066] In the above scheme, the cover 122 and the high-voltage interlock switch 2 establish a trigger-based connection. Specifically, when the cover 122 is closed, the high-voltage interlock switch 2 outputs a resistance signal to the frequency converter 4; when the cover 122 is open, the high-voltage interlock switch 2 outputs a no-resistance signal to the frequency converter 4. The frequency converter 4 controls the motor's operating status based on the received signal. For example, when a resistance signal is detected, the frequency converter 4 controls the motor to start; when a no-resistance signal is detected, the frequency converter 4 controls the motor to stop running.

[0067] With the above settings, the effect is as follows:

[0068] On the one hand, the opening and closing action of the junction box 122 controls the on / off of the interlock control circuit. When the junction box 12 cover needs to be disassembled during after-sales service or testing, the interlock control circuit will automatically disconnect to avoid electric shock accidents to relevant personnel and improve the safety and reliability of the motor.

[0069] On the other hand, in the prior art, the motor frequency converter control device includes a high-voltage connector, interlocking circuit, controller and protection device. The high-voltage connector also includes interlocking male and female terminals, etc., which is complex in structure. In contrast, the motor frequency converter control device used in this embodiment has the advantage of simple structure, thereby reducing structural cost, troubleshooting difficulty and maintenance cost.

[0070] It should be noted that the structures such as the aviation plug 3 and the frequency converter 4 are existing, and their specific uses will not be described in detail in this embodiment. The specific arrangement (such as the position) of these structures will be adjusted according to actual needs in this embodiment.

[0071] The existing method of establishing a connection between the high-voltage interlock switch 2, the aviation connector 3 and the frequency converter 4 can be referred to. For example, the two terminals of the high-voltage interlock switch 2 are electrically connected to the corresponding pins of the aviation connector 3, and the other pin of the aviation connector 3 is connected to the interlock control circuit of the frequency converter 4 through a wire.

[0072] The cooperation between the high-voltage interlock switch 2 and the corresponding structure can also refer to the existing ones. Taking the cover 122 as an example, the cover 122 connects the internal contacts of the high-voltage interlock switch 2 by pressing the button.

[0073] In some embodiments, the high-voltage interlock switch 2 is a micro switch. The high-voltage interlock switch 2 may also employ other devices with signal detection capabilities.

[0074] See Figure 4 In this embodiment, a bracket structure 5 is also included, and the high-voltage interlock switch 2 is fixedly installed inside the box 121 through the bracket structure 5;

[0075] The length of the support structure 5 is less than or equal to the height of the inner space of the box 121.

[0076] Support structure 5 can use existing stroke supports.

[0077] The bracket structure 5 can be customized according to the size of the high-voltage interlock switch 2 and the internal space layout of the box 121, solving problems such as size mismatch and space limitation that may occur when the high-voltage interlock switch 2 is directly installed with the box 121. For different models or specifications of high-voltage interlock switches 2, only the corresponding bracket needs to be replaced to achieve installation, without the need to modify the box 121 itself, reducing the requirements for the universality of the box 121.

[0078] The length of the support structure 5 is less than or equal to the height of the inner space of the box body 121, so as to avoid affecting the sealing and fitting assembly of the box cover 122 and the box body 121.

[0079] See Figure 4 In this embodiment, the mechanical linkage structure includes a metal spring 6. One end of the metal spring 6 acts on the high-voltage interlock switch 2, and the other end of the metal spring 6 acts on the cover 122 (or it can be said to be placed between the cover 122 and the high-voltage interlock switch 2).

[0080] The specific methods of achieving the above functions are not limited here; they can be achieved through threaded connections, hinges, etc.

[0081] The specific material of the metal shrapnel 6 is not limited, as long as it meets the usage requirements.

[0082] When the cover 122 is fixed on the box body 121, the cover 122 presses against the metal spring 6 first. If the metal spring 6 is regarded as part of the high-voltage interlock switch 2, the cover 122 will be in full contact with the high-voltage interlock switch 2 when it is closed, so that the interlock control circuit is formed.

[0083] When the high-voltage interlock switch 2 is directly connected to the cover 122, the contact between the cover 122 and the high-voltage interlock switch 2 depends on the rigid collision or compression of the two. If the cover 122 has slight deformation (such as warping after long-term use), it may lead to poor contact (such as the high-voltage interlock switch 2 not being fully triggered), causing misjudgment of the interlock control circuit (such as the cover 122 being closed but the interlock control circuit not being conductive). In this embodiment, the metal spring 6 has elastic deformation capability, which can compensate for the slight displacement or deformation of the cover 122 through its own pre-tightening force, ensuring that the high-voltage interlock switch 2 is stably triggered when the cover 122 is closed, reducing the risk of "lack of connection".

[0084] See Figure 4 In this embodiment, the metal spring 6 includes at least one arc-shaped segment.

[0085] The metal spring 6 is described using only one arc-shaped segment. In this case, the metal spring 6 has an arc-shaped structure, which can meet different installation requirements. For example, in one requirement, one end of the metal spring 6 needs to be installed on the top side of the high-voltage interlock switch 2, and the other end needs to be between the high-voltage interlock switch 2 and the cover 122. With this arc-shaped design, when the cover 122 is closed, the cover 122 applies a force to the arc-shaped metal spring 6, forcing it to deform. After deformation, the metal spring 6 always applies an elastic force towards the triggering part of the high-voltage interlock switch 2, ensuring that the device does not disconnect during movement or vibration, thus increasing the device's stability. When the cover 122 is opened, due to the elastic restoring force of the metal spring 6, it quickly disengages from the triggering part of the high-voltage interlock switch 2 during the process of returning to its initial state. This allows the inverter 4 to stop the motor more quickly, further improving safety when removing the junction box cover 122.

[0086] In some embodiments, the metal spring 6 includes at least two integrally formed arcuate segments.

[0087] See Figure 1 In this embodiment, along the radial direction of the motor body 1, the aviation plug 3 is disposed on the side of the rear end cover 11 to avoid increasing the axial dimension of the motor frequency converter control device and to ensure the applicability of the motor frequency converter control device.

[0088] See Figure 3 In this embodiment, the box body 121 is threadedly connected to the box cover 122;

[0089] At least one first threaded hole 7 is provided at the upper end of each side wall of the box body 121;

[0090] The cover 122 has a plurality of second threaded holes 8 corresponding to each of the first threaded holes 7.

[0091] The threaded connection is implemented using existing methods, such as bolt structures. The number and distribution of the second threaded holes 8 are determined based on the first threaded holes 7.

[0092] When the first threaded hole 7 is only made on one side wall of the box 121, all external forces will be concentrated on that side wall. Long-term vibration can easily lead to loosening of the bolt structure, stripping of the threads, or even deformation of the side wall of the box 121 due to excessive local stress. In this embodiment, at least one first threaded hole 7 is made on each side wall of the box 121, which can evenly distribute the external force to the surrounding area of ​​the box 121 and avoid the above-mentioned problems such as loosening of the bolt structure.

[0093] Based on the configuration of this embodiment, even if some bolts are loose, the interlock control circuit can still be connected, thereby ensuring the normal operation of the motor (main body).

[0094] See Figure 3 In this embodiment, a plurality of first protrusions 9 are formed on the outer surface of each side wall of the box 121, and each first protrusion 9 is provided with one of the first threaded holes 7.

[0095] The outer surface of each side wall of the box cover 122 is provided with a plurality of second protrusions 10, and each second protrusion 10 is provided with one of the second threaded holes 8.

[0096] Taking the first protrusion 9 as an example, the second protrusion 10 is illustrated in the same way:

[0097] On the one hand, by opening the first threaded hole 7 on the first protrusion 9, the area where the first threaded hole 7 is located can be locally reinforced, the material thickness at the first threaded hole 7 can be increased, the load-bearing strength and fatigue resistance of the threaded connection can be effectively improved, and the failure problems such as deformation and stripping of the first threaded hole 7 when the bolt is tightened or under long-term stress due to insufficient side wall thickness of the box 121 can be avoided.

[0098] On the other hand, the first protrusion 9 causes the first threaded hole 7 to be offset outward relative to the sealing mating surface of the box body 121 (i.e. the mating surface of the box body 121 and the box cover 122), which can prevent the first threaded hole 7 from being directly opened on the sealing mating surface and thus damage the integrity of the sealing mating surface, which is conducive to improving the sealing reliability after the box body 121 and the box cover 122 are assembled.

[0099] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A motor frequency converter control device with high-voltage interlock function, characterized in that: include: The motor body (1) includes a rear end cover (11) and a junction box (12), wherein the junction box (12) includes a box body (121) and a box cover (122). A high-voltage interlock switch (2) is fixedly installed inside the housing (121); The aircraft plug (3) is fixedly installed on the rear end cover (11); Inverter (4); The high-voltage interlock switch (2) is connected to the cover (122) through a mechanical linkage structure, and the high-voltage interlock switch (2) is connected in series with the interlock control circuit of the inverter (4) through the aviation plug (3) so as to control the on / off of the interlock control circuit through the opening and closing action of the cover (122).

2. The motor frequency conversion control device with high-voltage interlock function according to claim 1, characterized in that: It also includes a bracket structure (5), and the high-voltage interlock switch (2) is fixedly installed inside the box (121) through the bracket structure (5); The length of the support structure (5) is less than or equal to the height of the inner space of the box (121).

3. A motor frequency converter control device with high-voltage interlock function according to claim 1, characterized in that: The mechanical linkage structure includes a metal spring (6), one end of which acts on the high-voltage interlock switch (2), and the other end of which acts on the cover (122).

4. A motor frequency converter control device with high-voltage interlock function according to claim 3, characterized in that: The metal spring (6) includes at least one arc-shaped segment.

5. A motor frequency converter control device with high-voltage interlock function according to any one of claims 1-4, characterized in that: Along the radial direction of the motor body (1), the aviation plug (3) is located on the side of the rear end cover (11).

6. A motor frequency converter control device with high-voltage interlock function according to any one of claims 1-4, characterized in that: The box body (121) is threadedly connected to the box cover (122); At least one first threaded hole (7) is provided at the upper end of each side wall of the box (121). The cover (122) has a plurality of second threaded holes (8) corresponding to each of the first threaded holes (7).

7. A motor frequency converter control device with high-voltage interlock function according to claim 6, characterized in that: The outer surface of each side wall of the box (121) is provided with a plurality of first protrusions (9), and each first protrusion (9) is provided with one of the first threaded holes (7). The outer surface of each side wall of the box cover (122) is provided with a plurality of second protrusions (10), and each second protrusion (10) is provided with one of the second threaded holes (8).

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