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Negative temperature coefficient ntc thermistor for motor protection and manufacturing method thereof

A technology of negative temperature coefficient and thermistor, which is applied in the direction of resistors with negative temperature coefficient, etc., can solve the problem that it cannot be used as an induction device for motor over-temperature protection

Active Publication Date: 2015-12-09
DANDONG KELIANG ELECTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ratio of the material constant B value mainly reflects 25°C to 50°C, 25°C to 85°C, and the highest is only 25°C to 100°C. Since the highest point temperature is low, it can only be used for low temperature detection and protection of electronic products Among them, for the motor over-temperature protection, the protection temperature is determined according to the insulation grade. Generally, the insulation grade commonly used by motors is Class F, and its limit temperature is 155°C, and the protection temperature is set at 140°C. Therefore, the existing Negative temperature coefficient NTC thermistor cannot be a sensing device for motor over-temperature protection

Method used

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  • Negative temperature coefficient ntc thermistor for motor protection and manufacturing method thereof
  • Negative temperature coefficient ntc thermistor for motor protection and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The consumption of each component by weight percentage is respectively:

[0026] MnO 2 : 43.5%

[0027] co 2 o 3 : 17.2%

[0028] NiO: 24.8%

[0029] CuO: 13.5%

[0030] Fe 2 o 3 : 1.0%.

[0031] The properties of the product obtained by the above manufacturing method are: the resistance at 140°C is 0.24kΩ, the room temperature resistance is 3.52kΩ, and the material constant B(25 / 140) value is 2876K, which shows that these technical indicators are on the low side.

Embodiment 2

[0033] Each component is calculated by weight percentage, and consumption is respectively:

[0034] MnO 2 54.7%;

[0035] co 2 o 3 27.3%;

[0036] NiO is 12.4%;

[0037] CuO is 4.6%;

[0038] Fe 2 o 3 1.0%.

[0039] The properties of the product obtained by the above manufacturing method are: resistance at 140°C is 0.4KΩ, room temperature resistance is 29KΩ, material constant B(25 / 140) value is 4588K, it can be seen that these technical indicators are too large.

Embodiment 3

[0041] The consumption of each component by weight percentage is respectively:

[0042] MnO 2 : 51.0%;

[0043] co 2 o 3 : 22.5%;

[0044] NiO: 20.3%;

[0045] CuO: 5.1%;

[0046] Fe 2 o 3 : 1.1%.

[0047] The product obtained by the above-mentioned manufacturing method has the following properties: the resistance at 140°C is 0.303KΩ, the room temperature resistance is 8.7KΩ, and the material constant B (25 / 140) value is 3596K, which fully meets the technical indicators stated in the purpose of the invention.

[0048] In Example 3, after repeated tests, it was found that when the sintering curve at 1350°C and the ball milling speed at 300r / min were constant, different ball milling times and pre-burning curves resulted in different chip results. See the table below for details:

[0049]

[0050] As can be seen from the above table, when the ball milling time is 6 hours each time and the pre-burning temperature is 1000°C, the technical parameters of the NTC thermisto...

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Abstract

The invention provides a negative temperature coefficient (NTC) thermosensitive resistor for protecting a motor and a manufacturing method thereof. The thermosensitive resistor comprises the following basic components: MnO2, C02O3, NiO, CuO and Fe2O3, all the basic components, balls and deionized water are mixed according to the proportion, are subjected to the first-time ball milling, drying, then are conveyed into a muffle furnace for presintering, and are subjected to the second-time ball milling, PVA prilling is added, compact ceramic chips are sintered after preforming , the ceramic chips are coated with metal layer electrodes and are cut into chips with the required size according to the conventional method, leads are welded and heat conduction and insulation encapsulation are performed so as to obtain the resistor. When the temperature of the finished product reaches 140 DEG C, the resistance is 0.291 kilohm-0.309 kilohm, the resistance of the room temperature is 7.9 kilohm-8.9 kilohm, and the material constant B (25 / 140) is 3536-3600 K. The negative temperature coefficient (NTC) thermosensitive resistor is suitable for a temperature sensing transmitting device in the overtemperature protection device of the motor.

Description

technical field [0001] The patent application of the present invention relates to a negative temperature coefficient NTC thermistor and a manufacturing method thereof, especially an NTC negative temperature coefficient thermistor and a manufacturing method thereof for the application object of motor over-temperature protection. Background technique [0002] Existing motor over-temperature protection temperature sensing devices generally use linear PT100 temperature sensors or silicon temperature sensors, and their manufacturing process is relatively complicated and the cost is high. The negative temperature coefficient NTC thermistor is made of a semiconductor material sheet sintered from a metal oxide as a raw material, and is made through conventional processes such as metal electrode coating, cutting, wire welding, and encapsulation. Negative temperature coefficient NTC thermistors have technical advantages such as small fluctuations in resistance value and temperature ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04
Inventor 王丽娜
Owner DANDONG KELIANG ELECTRON
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