Temperature measuring assembly suitable for motor stator, stator unit using temperature measuring assembly, and motor

Abstract

The utility model discloses a temperature measurement assembly suitable for a motor stator, a stator unit using the same, and a motor, and the temperature measurement assembly comprises a circuit board body which is integrated with a temperature detection component used for detecting temperature, a welding part used for fixing an outgoing line corresponding to a winding of the motor stator, and a welding position used for fixing an external connecting line; the circuit board body is connected with an external controller through an external connecting line; and the connecting structure is arranged on the circuit board body and used for being detachably connected with the motor stator in a matched mode so as to fix the circuit board body to the motor stator. According to the utility model, the sensitivity of the stator temperature detection process can be considered, and the installation structure between the temperature measurement assembly and the stator is simplified.

Description

Technical Field

[0001] This utility model relates to the field of linear drive manufacturing technology, and in particular to a temperature measuring component suitable for motor stators, as well as a stator unit and motor using the same. Background Technology

[0002] The operating temperature of the stator windings of an induction motor is a crucial parameter for the motor's safe operation. If the stator winding operating temperature exceeds the limit temperature of its insulation material within a certain period, it will severely affect the motor's performance, reduce its service life, and in severe cases, lead to motor damage. Therefore, in practice, it is necessary to conduct temperature rise tests on the motor stator windings to obtain their steady-state temperature and temperature rise limits. This verifies the heat resistance performance of the motor's insulation and provides guidance for subsequent motor design and improvement.

[0003] Existing detection methods use temperature sensing devices, such as thermistor assemblies, to detect the temperature of the winding coils. For example, the first method, disclosed in CN211556989U, involves a stator structure with a temperature sensing device. Each stator core has several stator slots, each containing a sliding slider with an embedded thermistor, to detect the axial temperature of the motor rotor. In this structure, the thermistor needs to be connected to a current sensing module via wires to detect the current data of the NTC temperature-sensing resistor. Therefore, directly embedding the thermistor in the stator slot presents challenges in the actual motor production and assembly process due to the complex wiring arrangement. The complex wiring method may lead to the following problems: First, bent wires occupy space, affecting the closure of the motor's rear end cover; second, the thermistor wires, in the closed environment of the rear end cover, may uncontrollably entangle into the rotor assembly, affecting motor performance or even causing the entire machine to seize up; third, it increases the complexity of the assembly process and reduces the efficiency of batch assembly of the entire machine.

[0004] For example, the second type, disclosed in CN213151839U, discloses a motor temperature acquisition device for electric vehicles. This device includes a circuit board mounted on the motor, integrating a temperature detection device for detecting temperature and a position detection device for obtaining the motor rotor position. The circuit board is connected to a controller via external wiring. The temperature detection device uses surface-mount resistors. A bracket connects the circuit board to the motor housing. Compared to the first type, this disclosed technology avoids the wiring issues associated with the temperature detection device, but it also presents the following problems: First, the circuit board's connection to the motor housing makes it difficult for the temperature detection device to directly contact the stator winding coils, hindering its ability to effectively sense coil temperature and reducing temperature measurement sensitivity. Second, the circuit board requires additional support for fixation, thus increasing production costs.

[0005] In summary, considering the various problems existing in the current technology of using temperature detection devices such as thermistor assemblies to detect the temperature of the winding coil, further optimization and improvement of the temperature detection structure of the motor are needed. Utility Model Content

[0006] The primary objective of this invention is to provide a temperature measuring component suitable for motor stators, thereby addressing the technical challenges of balancing the sensitivity of stator temperature detection with a simplified installation structure between the temperature measuring component and the stator.

[0007] The second objective of this invention is to provide a stator unit that solves the technical problem of balancing the sensitivity of the stator temperature detection process with the simplification of the installation structure between the temperature measuring component and the stator.

[0008] The third objective of this invention is to provide a motor that solves the technical problem of balancing the sensitivity of the stator temperature detection process with the simplification of the installation structure between the temperature measuring component and the stator.

[0009] The temperature measuring component for motor stators of this utility model is implemented as follows:

[0010] A temperature measuring component suitable for motor stators includes:

[0011] The circuit board body integrates temperature detection components for detecting temperature, as well as soldering parts for fixing the lead wires corresponding to the windings of the motor stator and soldering positions for external connection wires; the circuit board body is connected to an external controller through external connection wires.

[0012] The connection structure, located on the circuit board body, is used to detachably connect with the motor stator to fix the circuit board body to the motor stator.

[0013] In an optional embodiment of this utility model, the connection structure is at least two slots formed on the circuit board body.

[0014] In an optional embodiment of this invention, the connection structure is at least two fastening holes formed on the circuit board body, suitable for fasteners to pass through.

[0015] In an optional embodiment of this invention, the temperature sensing component is a thermistor.

[0016] In an optional embodiment of this utility model, the circuit board body also integrates a position detection component for obtaining the position of the motor rotor.

[0017] In an optional embodiment of this invention, the position detection component is a Hall element with a magnetic tile suitable for the rotor of an induction motor.

[0018] The stator unit of this utility model is implemented as follows:

[0019] A stator unit includes: a stator core, an insulating frame fixed to the stator core, and a plurality of stator windings wound on the insulating frame; wherein

[0020] The insulating frame can also be detachably fitted with the temperature measuring component suitable for motor stator;

[0021] The insulating frame is provided with an adapter structure that mates with the connection structure; and

[0022] When the circuit board body and the insulating frame are assembled in place, the temperature detection component faces the winding, and the lead wire corresponding to the winding is suitable for welding and fixing to the welding part on the circuit board body.

[0023] In an optional embodiment of this invention, the insulating frame is further provided with a stepped portion for supporting the circuit board body; and

[0024] The adapter structure is located on the stepped portion.

[0025] The motor of this utility model is implemented as follows:

[0026] An electric motor includes: an electric motor housing and a rotor unit and a stator unit disposed within the electric motor housing for cooperative use; wherein

[0027] The motor housing includes a housing body for accommodating the stator unit and the rotor unit, and an end cap connected to one end of the housing body.

[0028] The end cap is provided with outlet ports suitable for one-to-one connection of external cables.

[0029] In optional embodiments of this utility model, the circuit board body is a fully circular annular body or a non-fully circular annular body; and

[0030] The circuit board body has a pre-set through hole suitable for the rotor shaft of the rotor unit to pass through.

[0031] By adopting the above technical solution, this utility model has the following beneficial effects: The temperature measuring component for motor stators, the stator unit using it, and the motor integrate the temperature sensing element onto the circuit board body, which is then directly connected to the stator unit. Furthermore, the circuit board body can simultaneously accommodate the welding and fixing of the leads corresponding to the stator unit windings. Based on this structure, the temperature measuring component simplifies the wiring process, and the temperature sensing element can directly monitor the most direct part of the motor's temperature rise—the junction of the stator windings and the rotor unit—effectively monitoring the internal temperature rise of the motor. Moreover, using this circuit board body does not affect the overall internal operation of the machine, preventing the temperature sensing element from malfunctioning inside the motor. It also improves the ease of replacement; if the temperature sensing element fails, only the entire circuit board body needs to be replaced, without needing to disassemble and reassemble the temperature sensing element within the motor's stator unit windings. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the temperature measuring assembly suitable for motor stators in Example 1;

[0033] Figure 2 This is a cross-sectional view of the temperature measuring component for motor stator in Example 1 applied to a specific motor.

[0034] Figure 3 This is an exploded structural diagram of the temperature measuring component for motor stator in Example 1 applied to a specific motor.

[0035] Figure 4 This is a first-view structural schematic diagram of the snap-fit ​​structure of the insulating frame of the stator unit in Embodiment 2;

[0036] Figure 5 This is a second-view structural schematic diagram of the snap-fit ​​structure of the insulating frame of the stator unit in Embodiment 2;

[0037] Figure 6 This is a schematic diagram of the cable outlet of the motor end cover in Example 3.

[0038] In the diagram: Circuit board body 1, temperature detection component 11, welding part 12, position detection component 13, welding position 14, slot 16, through hole 18, stator unit 2, insulating frame 21, step part 211, connecting post 212, clip 213, shell body 31, end cover 32, cable outlet 321, rotor unit 4, rotor shaft 41, external connection line 5. Detailed Implementation

[0039] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0040] Example 1: Please refer to Figure 1 and Figure 2 As shown, this embodiment provides a temperature measuring component suitable for a motor stator, including: a circuit board body 1, and a connection structure disposed on the circuit board body 1 for detachably engaging with the motor stator to fix the circuit board body 1 to the motor stator.

[0041] For the circuit board body 1 here, it can be directly and detachably assembled with the motor stator, thereby simplifying the assembly process and eliminating the need for additional connecting parts. Regarding the connection structure here, in the first optional embodiment, the connection structure is at least two slots 16 formed on the circuit board body 1, which only requires a snap-fit ​​method. In the second optional embodiment, the connection structure is at least two fastening holes formed on the circuit board body 1 suitable for fasteners to pass through. The fasteners can be, for example, but not limited to, screws. Theoretically, the above situations all meet the usage requirements of this embodiment, and this embodiment does not make an absolute limitation on them. It is understood that, in order to improve the reliability of the circuit board body 1 and the motor stator in the mating state, the connection structure on the circuit board body 1 is not designed as one, but can be three or even more evenly connected, and this embodiment does not make an absolute limitation on this number.

[0042] Based on the above structure, in order to ensure that the circuit board body 1 of this embodiment meets the temperature measurement requirements of the motor stator, a temperature detection component 11 for detecting temperature is integrated on the circuit board body 1. This temperature detection component 11 is, for example, but not limited to, a thermistor. The thermistor can be an NTC thermistor, a PTC thermistor, or a CTR thermistor, etc. In this embodiment, the thermistor is directly integrated on the circuit board body 1, which simplifies the wiring process, simplifies the assembly process, and improves the orderliness of the use process. It should be noted that, since the space of the motor is small and the internal temperature rise is uniformly distributed, the indirect measurement by the thermistor will not have a large error compared to the measurement result of the temperature sensor directly contacting the winding, and the installation position of the thermistor will not affect the temperature measurement.

[0043] Furthermore, for the circuit board body 1, since it is directly fixed to the motor stator, in order to meet the usage requirements of the motor stator, the circuit board body 1 is also provided with a welding part 12 for fixing the lead wires corresponding to the windings of the motor stator and a welding position 14 for the external connection line 5. Based on this, the circuit board body 1 is connected to the external controller through the external connection line 5.

[0044] Furthermore, it should be noted that a position detection component 13 for obtaining the position of the motor rotor is also integrated on the circuit board body 1. This position detection component 13 employs, for example, but not limited to, Hall elements suitable for the rotor magnets of an induction motor. Obtaining the position of the stator and rotor through the Hall element allows for better motor drive.

[0045] Therefore, optionally, the external connection line 5 used in this embodiment includes a power signal line, a position signal line, and a temperature signal line; the temperature detection component 11 is connected to the external controller via the temperature signal line, the position detection component 13 is connected to the external controller via the position signal line, and the two ends of the power signal line are connected to the circuit board body 1 and the external controller, respectively. Integrating the temperature detection component 11 and the position detection component 13 onto a single circuit board body 1 allows them to share the power signal on the circuit board body 1 without incurring additional board manufacturing costs.

[0046] In summary, for the temperature measurement component applicable to the motor stator in this embodiment, when it is applied in a specific motor, the temperature acquisition process is as follows: During use, the rotation of the motor is driven by the controller. When the motor load is large, the coil current and temperature of the motor stator unit 2 rise rapidly, and the resistance of the thermistor will decrease. The voltage across the thermistor in the controller will also decrease. Based on the acquired voltage value and the corresponding parameter table of the thermistor, the controller can know the current temperature. If the temperature is too high, the speed will be reduced to prevent the motor from burning out.

[0047] Example 2: Please refer to Figures 1 to 5 As shown, based on the temperature measuring component suitable for motor stators in Embodiment 1, this embodiment provides a stator unit 2, including: a stator core, an insulating frame 21 fixed on the stator core, and multiple stator windings wound on the insulating frame 21; wherein the temperature measuring component suitable for motor stators in Embodiment 1 can be detachably connected to the insulating frame 21. The insulating frame 21 is provided with an adapter structure that cooperates with the connection structure.

[0048] Based on the above structure, when the circuit board body 1 and the insulating frame 21 are assembled in place, the temperature sensing element 11 faces the winding, and the lead wires corresponding to the winding are suitable for welding and fixing to the welding part 12 on the circuit board body 1. Referring to the attached drawings, in one optional embodiment, the lead wires (U / V / W phases) corresponding to the winding are directly welded to the circuit board body 1 after the varnish is removed, integrating the welding part 12 with the three corresponding (U / V / W) phases. UV glue is applied to the welding points, partly to fix the lead wires and partly to provide a certain degree of sealing, making it waterproof and dustproof.

[0049] In this regard, it is also necessary to explain in detail that the insulating frame 21 is also provided with a stepped portion 211 for supporting the circuit board body 1; and an adapter structure is provided on the stepped portion 211.

[0050] The stepped portion 211 designed here creates a suitable gap between the circuit board body 1 and the magnetic tiles of the winding and rotor assembly. Research has shown that the optimal distance between the circuit board body 1 and the stator core is 3.5mm, achieved through the design of the height of the stepped portion 211. If the distance is too small, the circuit board body 1 will rub against the stator core; if the distance is too large, the Hall element on the circuit board body 1 will not be able to sense the magnetic tiles on the rotor unit 4. Therefore, for the circuit board body 1 in this embodiment, precise control of the distance between it and the stator core can be achieved simply by controlling the height of the stepped portion 211, thus reducing manufacturing difficulty.

[0051] In addition, it should be noted that in this embodiment, the circuit board body 1 is directly fixed on the insulating frame 21. While the temperature detection element 11 is facing the winding, the working area of ​​the temperature detection element 11 is exactly the temperature rise area where the winding and the rotor unit 4 of the motor meet, thereby improving the sensitivity of the detection structure.

[0052] Regarding the adapter structure of this embodiment, considering different cases of the connection structure in Embodiment 1, when the connection structure uses a slot 16, the adapter structure uses a buckle that adapts to the slot 16. Referring to the accompanying drawings, the buckle includes a connecting post 212 connected to the step portion 211 and suitable for insertion into the slot 16, and a clamping head 213 located at the end of the connecting post 212 away from the step portion 211, suitable for pressing against the circuit board body 1. To improve the smoothness of the assembly process between the circuit board body 1 and the buckle, the end face of the clamping head 213 facing away from the step portion 211 is designed as a sloped surface inclined towards the step portion 211. When the connection structure uses a fastening hole, the corresponding adapter structure can use a threaded hole, thus achieving a fastening connection between the fastening hole and the threaded hole using, for example, a screw. Of course, considering the actual situation of detachable assembly of the circuit board body 1 and the insulating frame 21, other methods can be used besides the two mentioned above. This embodiment does not impose absolute limitations on this. As long as the structure can facilitate the detachable assembly of the circuit board body 1 and the insulating frame 21, it can theoretically meet the usage requirements of this embodiment.

[0053] Example 3: Please refer to Figures 1 to 6As shown, based on the stator unit 2 of Embodiment 2, this embodiment provides a motor, including: a motor housing and a rotor unit 4 and the stator unit 2 of Embodiment 2 disposed in the motor housing for cooperative use; wherein the motor housing includes a housing body 31 for accommodating the stator unit 2 and the rotor unit 4, and an end cover 32 connected to one end of the housing body 31; the end cover 32 is provided with an outlet 321 suitable for corresponding to the external connection lines 5.

[0054] It should be noted that the circuit board body 1 in this embodiment can be a complete circular ring or a non-complete circular ring, and this embodiment does not make an absolute limitation on this. Regardless of which shape the circuit board body 1 is, a through hole 18 is pre-set on the circuit board body 1 to allow the rotor shaft 41 of the rotor unit 4 to pass through.

[0055] Regarding the fixing of the circuit board body 1 inside the motor housing in this embodiment, it should also be noted that, firstly, the axial positioning of the circuit board body 1 is achieved by the connecting part of the circuit board body 1 and the adapter part of the insulating frame 21, and then the radial positioning of the circuit board body 1 is achieved by the cooperation between the outlet 321 of the end cover 32 and the external connecting line of the circuit board body 1. Furthermore, the one-to-one cooperation between the external connecting line and the outlet 321 can also be used to ensure that when the circuit board body 1 is assembled onto the insulating frame 21, the working area of ​​the temperature detection component 11 is exactly the temperature rise area where the winding and the rotor unit 4 of the motor intersect.

[0056] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0057] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0060] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0061] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A temperature measuring component suitable for motor stators, characterized in that, include: The circuit board body integrates temperature detection components for detecting temperature, as well as soldering parts for fixing the lead wires corresponding to the windings of the motor stator and soldering positions for external connection wires. The circuit board itself is connected to an external controller via an external connection cable; The connection structure, located on the circuit board body, is used to detachably connect with the motor stator to fix the circuit board body to the motor stator.

2. The temperature measuring assembly for motor stators according to claim 1, characterized in that, The connection structure consists of at least two slots formed on the circuit board body.

3. The temperature measuring assembly for motor stators according to claim 1, characterized in that, The connection structure consists of at least two fastening holes formed on the circuit board body, suitable for fasteners to pass through.

4. The temperature measuring assembly for a motor stator according to any one of claims 1 to 3, characterized in that, The temperature sensing component is a thermistor.

5. The temperature measuring assembly for a motor stator according to any one of claims 1 to 3, characterized in that, The circuit board body also integrates position detection components for obtaining the position of the motor rotor.

6. The temperature measuring assembly for motor stators according to claim 5, characterized in that, The position detection device uses a Hall element with a magnetic tile suitable for the rotor of an induction motor.

7. A stator unit, characterized in that, include: The stator core, the insulating frame fixed on the stator core, and the plurality of stator windings wound on the insulating frame; in The insulating frame may also be detachably fitted with a temperature measuring component suitable for motor stator as described in any one of claims 1 to 6; The insulating frame is provided with an adapter structure that mates with the connection structure; and When the circuit board body and the insulating frame are assembled in place, the temperature detection component faces the winding, and the lead wire corresponding to the winding is suitable for welding and fixing to the welding part on the circuit board body.

8. The stator unit according to claim 7, characterized in that, The insulating frame is also provided with a stepped portion for supporting the circuit board body; and The adapter structure is located on the stepped portion.

9. An electric motor, characterized in that, include: The motor housing and the rotor unit disposed within the motor housing for cooperative use, and the stator unit as described in claim 7 or 8; in The motor housing includes a housing body for accommodating the stator unit and the rotor unit, and an end cap connected to one end of the housing body. The end cap is provided with outlet ports suitable for one-to-one connection of external cables.

10. The motor according to claim 9, characterized in that, The circuit board body is either a perfectly circular ring or a non-circular ring; and The circuit board body has a pre-set through hole suitable for the rotor shaft of the rotor unit to pass through.

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