A method for detecting damage of sensor enameled wire

Abstract

The invention discloses a method for detecting damage of enameled wire of a sensor. The invention uses high and low temperature cycles. If the copper conductor of the coil of the sensor is damaged during the production process, the copper conductor will expand and contract as the temperature changes during the high and low temperature cycles. When the temperature rises, the damaged part of the enameled copper wire is subjected to tension, resulting in a reduction in the cross-sectional area of ​​the damaged part, thereby increasing the resistance. When the temperature drops, the enameled wire returns to its original state. Due to thermal expansion and contraction, the damaged part of the copper conductor will appear to be broken but not broken for a short time and then recover. When the copper conductor appears to be broken but not broken, the coil resistance will increase, but it will have no effect on the undamaged copper conductor. Therefore, the line detection system can inspect the situation in which the enameled wire is damaged during the production process of the product but has not yet been broken or short-circuited, so as to prevent defective products from being discharged to customers, thereby improving the market competitiveness of the product.

Description

Technical Field

[0001] The invention relates to the technical field of enameled wire damage detection, and in particular to a sensor enameled wire damage detection method. Background Art

[0002] Existing fault detection methods for linear displacement sensors or angular displacement sensors all test for broken or short-circuited enameled wires. These inspection methods are for testing for obvious broken wire problems or short-circuit problems, and are mainly used for online self-inspection when a product fails during use. However, it is impossible to inspect the situation where the enameled wire is damaged during the production process but has not yet been broken or short-circuited, and it is impossible to prevent defective products from being shipped to customers, thereby reducing the market competitiveness of the products.

[0003] In view of this, the inventor has made in-depth considerations and actively researched, improved and tried to develop and design the present invention in view of the many deficiencies and inconveniences caused by the imperfections in the above-mentioned enameled wire damage detection process. Summary of the invention

[0004] The purpose of the present invention is to provide a method for detecting damage to the enameled wire of a sensor, which is used to inspect the situation where the enameled wire is damaged during the production process but has not yet been broken or short-circuited, so as to prevent defective products from being sold to customers, thereby improving the market competitiveness of the products.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A method for detecting damage to a sensor enameled wire, the method comprising the following steps:

[0007] Step 1: Place the sensor to be tested in a temperature box, connect the two ends of the coil in the sensor to the line detection system, and control the temperature in the temperature box to cycle in the range of -55°C to 215°C, the number of cycles is 5-10 times, and the temperature change rate is 10°C / min;

[0008] Step 2: Use the disconnection detection module in the line detection system to measure the resistance value of the coil in real time, and feed the resistance value back to the main control module in the line detection system;

[0009] Step 3: When the resistance value changes linearly, the main control module controls the fault indicator light in the line detection system to light up green, indicating that the coil is normal and not damaged; when the resistance value suddenly increases or decreases, the main control module controls the fault indicator light in the line detection system to light up red, indicating that the coil is abnormally damaged;

[0010] Step 4: The inspector takes out the sensors and classifies them according to the fault indicator light: qualified products that have never had a red light on and unqualified products that have had a red light on.

[0011] Preferably, the detection method further comprises the following steps:

[0012] Step 2.1: When using the disconnection detection module to measure the resistance value of the coil, the high-frequency electromagnetic interference of the external environment is filtered out by the low-pass filter in the line detection system to prevent false disconnection judgment caused by high-frequency electromagnetic interference.

[0013] Preferably, the detection method further comprises the following steps:

[0014] Step 3.1, when the main control module controls the fault indicator light in the line detection system to light up red, the signal latch module in the line detection system locks the fault indicator light to light up red;

[0015] Step 4.1: After removing the unqualified products, the inspector controls the fault indicator light to return to its initial state through the reset button in the line detection system.

[0016] After adopting the above scheme, the present invention changes through high and low temperature cycles. If the coil copper conductor of the sensor is damaged during the production process, the copper conductor will expand and contract with the temperature during the high and low temperature cycles. The damaged part of the enameled copper wire is subjected to tension when the temperature rises, resulting in a decrease in the cross-sectional area of ​​the damaged part, thereby increasing the resistance. When the temperature drops, the enameled wire returns to its original state. The damaged part of the copper conductor will be in a state of being seemingly broken but not broken for a short time due to thermal expansion and contraction, and when the copper conductor appears to be broken but not broken, the coil resistance will increase, but it will have no effect on the undamaged copper conductor. Therefore, the line detection system can inspect the situation where the enameled wire is damaged during the production process of the product but has not yet been broken or short-circuited, so as to prevent defective products from being released to customers, thereby enhancing the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the working principle of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0020] like Figure 1 As shown, a preferred embodiment of a method for detecting damage to a sensor enameled wire of the present invention is shown, and the detection method comprises the following steps:

[0021] Step 1: Place the sensor to be tested in a temperature box, connect the two ends of the coil 11 in the sensor to the line detection system 1, and control the temperature in the temperature box to cycle in the range of -55°C to 215°C, the number of cycles is 5-10 times, and the temperature change rate is 10°C / min;

[0022] Step 2: Use the disconnection detection module 12 in the line detection system 1 to measure the resistance value of the coil 11 in real time, and feed the resistance value back to the main control module in the line detection system 1;

[0023] Step 3, when the resistance value changes linearly, the main control module controls the fault indicator light 14 in the line detection system 1 to light up green, indicating that the coil 11 is normal and not damaged; when the resistance value suddenly increases or decreases, the main control module controls the fault indicator light 14 in the line detection system 1 to light up red, indicating that the coil 11 is abnormally damaged;

[0024] Step 4: The inspector takes out the sensors and classifies them according to the fault indicator light 14: qualified products whose red lights have not been on and unqualified products whose red lights have been on.

[0025] The focus of the present invention is that, through high and low temperature cycles, if the copper conductor of the coil 11 of the sensor is damaged during the production process, the copper conductor will expand and contract with the temperature during the high and low temperature cycles. The damaged part of the enameled copper wire is subjected to tension when the temperature rises, resulting in a decrease in the cross-sectional area of ​​the damaged part, thereby increasing the resistance, and when the temperature drops, the enameled wire returns to its original state; the damaged part of the copper conductor will be in a state of being seemingly broken and then restored for a short time due to thermal expansion and contraction. When the copper conductor appears to be broken but not broken, the resistance of the coil 11 will increase, but it will have no effect on the undamaged copper conductor. Therefore, the line detection system 1 can inspect the situation where the enameled wire is damaged during the production process of the product but has not yet been broken or short-circuited, thereby preventing defective products from being released to customers, thereby enhancing the market competitiveness of the product.

[0026] The above detection method also includes the following steps:

[0027] Step 2.1: When the disconnection detection module 12 is used to measure the resistance value of the coil 11, the high-frequency electromagnetic interference of the external environment is filtered out by the low-pass filter 13 in the line detection system 1. In this way, it is possible to prevent the disconnection detection module 12 from measuring errors due to high-frequency electromagnetic interference, avoid misjudgment by the main control module, and thus improve the accuracy of the detection method.

[0028] The above detection method also includes the following steps:

[0029] Step 3.1, when the main control module controls the fault indicator light 14 in the line detection system 1 to light up red, the signal latch module 15 in the line detection system 1 locks the fault indicator light 14 to light up red;

[0030] Step 4.1: After taking out the unqualified products, the inspector controls the fault indicator light 14 to restore to the initial state through the reset button 16 in the line inspection system 1.

[0031] The signal latch module 15 locks the fault indicator light 14 to light up red, and the inspector controls it to return to the initial state through the reset button 16, so that the inspector does not need to watch the display state of the fault indicator light 14 in real time, thereby facilitating the detection of the sensor coil 11.

[0032] The above description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that ordinary technicians in the field can realize and use various different exemplary embodiments of the present invention and various different selections and changes. Any appropriate changes or modifications made by ordinary technicians in the field of technology should be regarded as not departing from the patent scope of the present invention.

Claims

1. A method for detecting damage to a sensor enameled wire, characterized in that: The detection method comprises the following steps: Step 1: Place the sensor to be tested in a temperature box, connect the two ends of the coil in the sensor to the line detection system, and control the temperature in the temperature box to cycle in the range of -55°C to 215°C, the number of cycles is 5-10 times, and the temperature change rate is 10°C / min; Step 2: Use the disconnection detection module in the line detection system to measure the resistance value of the coil in real time, and feed the resistance value back to the main control module in the line detection system; Step 3, when the resistance value changes linearly, the main control module controls the fault indicator light in the line detection system to light up green, indicating that the coil is normal and not damaged; when the resistance value suddenly increases or decreases, the main control module controls the fault indicator light in the line detection system to light up red, indicating that the coil is abnormally damaged, wherein, at the damaged part of the enameled wire copper conductor, due to thermal expansion and contraction, the enameled wire will appear to be broken but not broken for a short time and then recover, and when the copper conductor appears to be broken but not broken, the coil resistance will increase, but it will have no effect on the undamaged copper conductor; Step 4: The inspector takes out the sensors and classifies them according to the fault indicator light: qualified products that have never had a red light on and unqualified products that have had a red light on.

2. A method for detecting damage to a sensor enameled wire according to claim 1, characterized in that: The detection method further comprises the following steps: Step 2.1: When using the disconnection detection module to measure the resistance value of the coil, the high-frequency electromagnetic interference of the external environment is filtered out by the low-pass filter in the line detection system to prevent false disconnection judgment caused by high-frequency electromagnetic interference.

3. A method for detecting damage to a sensor enameled wire as claimed in claim 1, characterized in that: The detection method further comprises the following steps: Step 3.1, when the main control module controls the fault indicator light in the line detection system to light up red, the signal latch module in the line detection system locks the fault indicator light to light up red; Step 4.1: After removing the unqualified products, the inspector controls the fault indicator light to return to its initial state through the reset button in the line detection system.

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