Insulating cap with groove for fixing temperature detector, structure for fixing temperature detector of rotating electric machine, rotating electric machine with fixed temperature detector, method for fixing temperature detector of rotating electric machine, and rotating electric machine manufacturing apparatus

Abstract

To provide a technology for detecting the temperature of a coil capable of easily fixing a temperature detector such as a thermistor used for detecting the temperature of the coil, capable of reducing the dispersion of a measured temperature, and capable of accurately measuring the temperature change of the coil with excellent responsiveness without interposing another member between the coil being a heating element and the temperature detector.SOLUTION: The insulating cap 10 with the groove for fixing the temperature detector is provided with a housing part 2 for housing the temperature detector D for detecting the coil temperature to be inserted from the outside on its inner wall surface, and the housing part 2 is formed so that at least a part of the temperature detector such as a thermocouple or a thermistor to be inserted is brought into contact with the coil C.SELECTED DRAWING: Figure 1-2

Description

[Technical Field]

[0001] The present invention relates to an insulating cap with a groove for fixing a temperature detector, a temperature detector fixing structure for a rotating electric machine, a rotating electric machine with a fixed temperature detector, a method for fixing a temperature detector for a rotating electric machine, and a rotating electric machine manufacturing apparatus, and in particular to an insulating cap with a groove for fixing a temperature detector that can easily measure the coil temperature of a rotating electric machine. [Background technology]

[0002] Configurations for providing a temperature detection element to detect the temperature of a coil in a motor have been disclosed in several patent applications, etc. For example, Patent Document 1, listed below, describes a configuration in which a temperature detection element such as a thermistor is attached to the surface of the coil, Patent Document 2 describes a configuration in which a temperature detection element is attached between the coils, and Patent Documents 3 and 4 describe configurations in which a component for fixing the temperature detection element is used separately from the insulating cap. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-306886 A "Motor and motor manufacturing method" [Patent Document 2] JP 2010-252508 A "Temperature detection element mounting structure" [Patent Document 3] JP 2010-259271 A "Electric motor and electric vehicle [Patent Document 4] JP 2019-205260 A "Stator and rotating electric machine Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the technology disclosed in Document 1, it is difficult to stably adhere and fix the temperature detector to the coil surface, and variations in the measured temperature are also an issue. Furthermore, with the technology disclosed in Document 2, if other components are present between the coil (heat generating element) and the temperature detector, the coil temperature cannot be measured accurately, and the response to temperature changes in the coil becomes slow. Furthermore, with the technologies disclosed in Documents 3 and 4, a separate fixing component must be prepared and installed to install the temperature detector. A method that does not have these problems is needed.

[0005] Therefore, the problem that the present invention aims to solve is to provide a coil temperature detection technology that takes into account the problems of the conventional technology, in which a temperature detection element such as a thermistor used to detect coil temperature can be easily fixed, variation in measured temperature can be reduced, and no other member is required between the coil (which is a heating element) and the temperature detection element, thereby enabling temperature changes in the coil to be measured responsively and accurately. [Means for solving the problem]

[0006] After studying the above-mentioned problems, the inventors of the present application came up with a structure in which an insulating cap that contacts the end face of the stator core has a groove extending from the outer diameter side of the stator toward the inside for fixing a temperature detector. With this structure, the temperature detector is inserted from the outer diameter side of the core in a direction perpendicular to the winding direction of the coil, making it possible to make contact with the coil without any gap, thereby enabling accurate detection of the coil temperature. The present invention was completed based on this idea. That is, the invention claimed in this application, or at least the invention disclosed therein, as a means for solving the above-mentioned problems is as follows.

[0007] [1] An insulating cap with a groove for fixing a temperature detector, which provides insulation protection for a coil wound around the teeth of the stator of a rotating electric machine, and which has an inner wall surface provided with a housing portion for housing a temperature detector for detecting the coil temperature, which is inserted from the outside, and which is formed so that at least a part of the inserted temperature detector comes into contact with the coil. [2] The insulating cap with grooves for fixing a temperature detector according to [1], characterized in that the accommodating portion is provided in a direction intersecting with the winding direction of the coil. [3] The insulating cap with a groove for fixing a temperature detector according to [2], characterized in that the housing portion is formed with an inner dimension that allows the temperature detector to be inserted therein. [4] An insulating cap with a groove for fixing a temperature detector as described in [2], characterized in that it is formed with an outer diameter portion which is the portion on the stator side, an inner diameter portion which is the portion opposite the outer diameter portion, a side wall portion which is the longitudinal portion connecting the outer diameter portion and the inner diameter portion, and a protruding portion which is a portion provided at the end of the side wall portion, and the accommodating portion is provided at the protruding portion. [5] A temperature detector fixing structure for a rotating electric machine, characterized in that the temperature detector is fixed by an insulating cap with a groove for fixing the temperature detector described in any one of [1], [2], [3], and [4].

[0008] [6] The temperature detector fixing structure for a rotating electrical machine according to [5], characterized in that an adhesive or other fixing agent is used to fix the temperature detector. [7] A rotating electric machine with a temperature detector fixed thereto, characterized by comprising the temperature detector fixing structure described in [5]. [8] A method for fixing a temperature detector in a rotating electric machine, comprising: a coil covering step of covering a coil wound around a tooth of a stator of a rotating electric machine with an insulating cap with a groove for fixing a temperature detector described in any one of [1], [2], [3], and [4]; and a temperature detector fixing step of inserting and fixing the temperature detector in the housing of the insulating cap after the coil covering. [9] A manufacturing device for a rotating electric machine, characterized by comprising: a coil covering means for covering a coil wound around the teeth of a stator of a rotating electric machine with an insulating cap with a groove for fixing a temperature detector as described in any one of [1], [2], [3], and [4]; and a temperature detector fixing means for inserting and fixing a temperature detector into a housing portion of the insulating cap after or before the coil is covered. [Effects of the Invention]

[0009] Since the insulated cap with a groove for fixing a temperature detector, the temperature detector fixing structure of a rotating electric machine, the rotating electric machine with a fixed temperature detector, the temperature detector fixing method of a rotating electric machine, and the rotating electric machine manufacturing apparatus of the present invention are configured as described above, according to these, for the coil temperature detection of a rotating electric machine using a temperature detector such as a thermistor, the temperature detector can be firmly, stably, and easily fixed, and the variation in the measured temperature can be suppressed to enable stable temperature measurement.

[0010] According to the present invention, moreover, since there is no need for the intervention of other members between the coil, which is a heating element, and the temperature detector, and the temperature can be directly detected, the temperature change of the coil can be accurately measured with good responsiveness. Thereby, the heat generation of the coil due to overload or overcurrent can be appropriately monitored, and countermeasures can be taken when the coil generates heat. Particularly when the present invention is used for a servo motor or the like, the heat generation of the coil can be timely feedback to the driver control, and the burnout of the coil can be effectively prevented.

Brief Description of the Drawings

[0011] [Figure 1] It is a side view explanatory drawing showing the basic configuration of the insulated cap with a groove for fixing a temperature detector of the present invention. [Figure 1-2] It is a side view explanatory drawing showing the basic operation of the insulated cap with a groove for fixing a temperature detector of the present invention shown in FIG. 1 (Part 1). [Figure 1-3] It is a side view explanatory drawing showing the basic operation of the insulated cap with a groove for fixing a temperature detector of the present invention shown in FIG. 1 (Part 2). [Figure 2] It is a top view explanatory drawing of the insulated cap with a groove for fixing a temperature detector of the present invention shown in FIGS. 1, 1-2, and 1-3. [Figure 3] It is a perspective explanatory drawing showing an embodiment of the insulated cap with a groove for fixing a temperature detector of the present invention. [Figure 3-2] It is 4 examples of perspective explanatory drawings of parts that can constitute the embodiment shown in FIG. 3. [Figure 4] It is a perspective explanatory drawing showing the usage state of the embodiment shown in FIG. 3 and an example of the temperature detector fixing structure of the rotating electric machine of the present invention. [Figure 5]4 is a side cross-sectional explanatory view showing the state of use of the embodiment shown in FIG. 3 and an example of a temperature detector fixing structure for a rotating electrical machine according to the present invention. FIG. [Figure 6] 1 is a flowchart showing a basic configuration of a method for fixing a temperature detector for a rotating electrical machine according to the present invention; [Figure 7] 1 is a conceptual diagram showing a basic configuration of a rotating electrical machine manufacturing apparatus according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view illustrating the basic structure of an insulating cap with grooves for fixing a temperature detector according to the present invention. Figure 1-2 is a side view (part 1) illustrating the basic function of the grooved insulating cap for fixing a temperature detector of the present invention shown in Figure 1, and Figure 1-3 is a side view (part 2) illustrating the basic function. As shown in these figures, the grooved insulating cap 10 for fixing a temperature detector is an insulating cap that insulates and protects the coil wound around the teeth of the stator of a rotating electrical machine. Its main configuration is that it has an inner wall surface provided with a housing 2 that houses a temperature detector for detecting the temperature of the coil C that is inserted from the outside, and the housing 2 is formed so that at least a portion of the inserted temperature detector D comes into contact with the coil C.

[0013] Note that a thermocouple or a thermistor is assumed as an example of the temperature detector D. Also, each figure shows the various parts of the grooved insulating cap 10 for fixing the temperature detector, including the outer diameter part 3, which is the part on the inlet / outlet side of the temperature detector D, i.e., the stator side, the inner diameter part 4, which is the part on the opposite side, and the side wall part 5, which connects the outer diameter part 3 and inner diameter part 4 and is the part around which the coil C is wound.

[0014] With this grooved insulating cap 10 for fixing a temperature detector having such a configuration, a temperature detector D for detecting the temperature of the coil C is inserted from the outside into the housing portion 2 provided on the inner wall surface as shown in Figures 1-2 and 1-3, and at least a portion of the inserted temperature detector D comes into contact with the coil C wound around the side wall portion 5 as shown in Figure 1-3. In other words, the grooved insulating cap 10 for fixing a temperature detector has a portion that is exposed to the coil C like a notch, and at that portion the temperature detector D and the coil C can come into contact without any separation.

[0015] Figure 2 is a top view of the grooved insulating cap for fixing a temperature detector of the present invention shown in Figures 1, 1-2, and 1-3. (2), (2-2), and (2-3) in Figure 2 correspond to Figures 1, 1-2, and 1-3, respectively. That is, (2) shows the grooved insulating cap for fixing a temperature detector 10 itself, (2-2) shows the state in which the coil C is wound around the side wall portion 5, and (2-3) shows the state in which the temperature detector D, with the coil C wound around it, is inserted into the housing portion 2.

[0016] As shown in the above figures, the accommodation portion 2 of the grooved insulating cap 10 for fixing a temperature detecting element can be configured to be provided in a direction that intersects with the winding direction of the coil C. This ensures that the temperature detecting element D inserted into the accommodation portion 2 makes contact with the coil C, ensures that the number of contacting coil wires is multiple, reduces bias in temperature detection, and improves the stability, responsiveness, and accuracy of temperature measurement. To further enhance these effects, it is more desirable to have the accommodation portion 2 oriented in a direction that is approximately perpendicular to the winding direction of the coil C.

[0017] Furthermore, as shown in Figures 1-3 and (2-3) in Figure 2, it is more desirable that the housing 2 be configured with internal dimensions that allow the temperature detection element D to be inserted. In other words, the housing 2 is configured with dimensions that allow the temperature detection element D to fit in as tightly as possible. With this configuration, the detection element D inserted into the housing 2 is fixed in place without any play within the housing 2, ensuring reliable contact with the coil C and further improving the stability, responsiveness, and accuracy of temperature measurement.

[0018] 1-2 and 1-3 show a method of use in which the coil C is first wound around the grooved insulating cap 10 for fixing the temperature detecting element, and then the temperature detecting element D is inserted into the housing portion 2, but the method of use of the present invention is not limited to this. In other words, the temperature detecting element D may be previously housed in the housing portion 2, and then the coil C may be wound around it later. However, in consideration of the reliability of contact between the temperature detecting element D and the coil C, the method of inserting the temperature detecting element D later is more preferable.

[0019] 3 is a perspective view illustrating an embodiment of an insulating cap 310 with a groove for fixing a temperature detector according to the present invention. As shown in the figure, the insulating cap 310 with a groove for fixing a temperature detector according to the present invention is formed with an outer diameter portion 33 that is the portion on the stator S side, an inner diameter portion 34 that is the portion opposite the outer diameter portion 33, a side wall portion 35 that is the longitudinal portion connecting the outer diameter portion 33 and the inner diameter portion 34, and a protruding portion 36 that is the portion provided at the end of the side wall portion 35, and the housing portion 32 is provided at the protruding portion 36.

[0020] In this example of the insulating cap 310 with grooves for fixing the temperature detector, with the coil wound around the side wall portion 35, the temperature detector is inserted into the accommodating portion 32 provided at the tip portion 36 from the outer diameter portion 33 side, and this insertion brings the temperature detector into contact with the coil, thereby detecting the temperature of the coil.

[0021] The grooved insulating cap for fixing a temperature detector of the present invention may be formed as a single unit, or may be formed by combining multiple components. Fig. 3 shows an example formed from two components, while Fig. 3-2 shows four perspective views of components that may constitute the embodiment shown in Fig. 3. The grooved insulating cap part p310 for fixing a temperature detector shown here includes an outer diameter portion p33, an inner diameter portion p34, a side wall portion p35, a tip portion 36, and a housing portion 32. By combining the parts p310 so that the tip portions p36 form both ends, the grooved insulating cap for fixing a temperature detector 310 is formed.

[0022] FIG. 4 is a perspective explanatory view showing the state of use of the embodiment shown in FIG. 3 and an example of a temperature detector fixing structure for a rotating electrical machine according to the present invention. Fig. 5 is a cross-sectional side view illustrating the state of use of the embodiment shown in Fig. 3 and an example of a temperature detector fixing structure for a rotating electrical machine according to the present invention. As shown in these figures, the temperature detector D is inserted into the housing portion 32 of the grooved insulating cap 310 for fixing the temperature detector shown in Fig. 3 from the outer diameter portion 33 side, allowing the temperature detector D and the coil to come into contact without any gap, thereby detecting the temperature of the coil.

[0023] 4 and 5, a temperature detecting body fixing structure 330 for a rotating electric machine in which a temperature detecting body D is fixed by an insulating cap 310 with a groove for fixing the temperature detecting body is also within the scope of the present invention. In addition, a rotating electric machine with a fixed temperature detecting body that is equipped with the temperature detecting body fixing structure 330 is also within the scope of the present invention.

[0024] Note that adhesive or other fixing agents may be used to fix the temperature detecting element D in the temperature detecting element fixing structure 330. For example, using a potting agent such as epoxy resin or silicone resin, a sealant, adhesive, or the like to fill any small gap that may occur between the temperature detecting element D and the accommodation portion 32 of the grooved insulating cap 310 for fixing the temperature detecting element is effective in further enhancing the effects of the present invention.

[0025] 6 is a flow chart showing the basic configuration of the method for fixing a temperature detector in a rotating electric machine according to the present invention. As shown in the figure, the method for fixing a temperature detector in a rotating electric machine is characterized by comprising a coil covering step P10 in which a coil wound around a stator tooth of the rotating electric machine is covered with an insulating cap with a groove for fixing a temperature detector having any of the configurations described above, and a temperature detector fixing step P20 in which the temperature detector is inserted into the housing of the insulating cap after the coil covering and fixed therein.

[0026] According to this method for fixing a temperature detector for a rotating electric machine having such a configuration, in the coil covering process P10, the coil wound around the teeth of the stator of the rotating electric machine is covered with an insulating cap with a groove for fixing the temperature detector, and then in the temperature detector fixing process P20, the temperature detector is inserted into and fixed in the storage portion of the insulating cap after the coil covering, thereby forming a temperature detector fixing structure 100.

[0027] 7 is a conceptual diagram showing the basic configuration of a manufacturing apparatus for a rotating electrical machine according to the present invention. As shown in the figure, the manufacturing apparatus for a rotating electrical machine 1000 is characterized by including coil covering means 400 for covering the coil wound around the teeth of the stator of the rotating electrical machine with an insulating cap with a groove for fixing a temperature detector having any of the configurations described above, and temperature detector fixing means 600 for inserting and fixing the temperature detector in the housing of the insulating cap after the coil is covered.

[0028] In the present rotating electrical machine manufacturing apparatus 1000 having such a configuration, the coil wound around the stator teeth is covered by the coil covering means 400 using an insulating cap with a groove for fixing the temperature detector, and the temperature detector fixing means 600 inserts and fixes the temperature detector into the storage portion of the insulating cap after or before the coil is covered. [Industrial Applicability]

[0029] The grooved insulating cap for fixing a temperature detector, the temperature detector fixing structure for a rotating electric machine, the rotating electric machine with the temperature detector fixed thereto, the temperature detector fixing method for a rotating electric machine, and the rotating electric machine manufacturing apparatus of the present invention enable the temperature detector to be firmly fixed for detecting the coil temperature of a rotating electric machine, enabling stable, responsive, and accurate temperature measurement, and enabling appropriate monitoring and response of coil heat generation due to overload or overcurrent. Therefore, this invention is highly industrially applicable in the fields of manufacturing and using rotating electric machines such as AC servo motors, and all related fields. [Explanation of symbols]

[0030] 2, 32…Storage section 3, 33...outer diameter part 4, 34...Inner diameter 5, 35...Side wall 10, 310...Insulating cap with groove for fixing temperature detector 36...Pointed end 100, 330...Temperature detector fixing structure for rotating electrical machine 400...Coil coating means 600...Temperature detecting body fixing means 1000...Rotating electrical machine manufacturing equipment p310...Insulating cap part with groove for fixing temperature detector p33…outer diameter part p34...Inner diameter p35…Side wall part C...Coil D...Temperature detector P10...Coil coating process P20...Temperature detector fixing process S... Stator

Claims

1. An insulating cap for insulating and protecting a coil wound around a stator tooth of a rotating electric machine, The inner wall surface is provided with a housing portion for housing a temperature detector for detecting the coil temperature, which is inserted from the outside. The insulating cap with a groove for fixing a temperature detector is characterized in that the accommodation portion is formed so that at least a part of the temperature detector inserted therein comes into contact with the coil.

2. 2. The grooved insulating cap for fixing a temperature detector according to claim 1, wherein the housing portion is provided in a direction intersecting with a winding direction of the coil.

3. 3. The insulating cap with a groove for fixing a temperature detector according to claim 2, wherein the accommodation portion is formed with an inner dimension for inserting the temperature detector thereinto.

4. The grooved insulating cap for fixing a temperature detector as described in claim 2 is characterized in that it is formed with an outer diameter portion which is the portion on the stator side, an inner diameter portion which is the portion opposite the outer diameter portion, a side wall portion which is the longitudinal portion connecting the outer diameter portion and the inner diameter portion, and a protruding portion which is a portion provided at the end of the side wall portion, and the accommodating portion is provided at the protruding portion.

5. 5. A temperature detector fixing structure for a rotating electrical machine, wherein the temperature detector is fixed by the insulating cap with grooves for fixing the temperature detector according to claim 1.

6. 6. The temperature detector fixing structure for a rotating electrical machine according to claim 5, wherein an adhesive or other fixing agent is used to fix the temperature detector.

7. A rotating electrical machine with a temperature detector fixed thereto, comprising the temperature detector fixing structure according to claim 5.

8. a coil covering step of covering a coil wound around a stator tooth of a rotating electrical machine with the grooved insulating cap for fixing a temperature detector according to any one of claims 1 to 4; a temperature detector fixing step of inserting and fixing the temperature detector into the housing of the insulating cap after the coil has been covered;

9. a coil covering means for covering a coil wound around a tooth of a stator of a rotating electrical machine with the grooved insulating cap for fixing a temperature detector according to any one of claims 1 to 4; The rotating electrical machine manufacturing apparatus further comprises a temperature detector fixing means for inserting and fixing a temperature detector into the housing portion of the insulating cap after or before the coil is coated.

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