Infrared axle temperature detection system modulation type probe infrared radiation modulation device and driving method

Abstract

The invention discloses an infrared axle temperature detection system modulation type probe infrared radiation modulation device comprising a modulation driving board, a brushless DC motor and a radiation modulation disc. The modulation driving board comprises a power supply module, a control module, a power inversion module, a circuit protection module, a position signal processing module and a modulation signal processing module. When a wheel sensor in the train coming direction of the rail side detects passing of a train, the wheel sensor transmits a train passing signal to a control machine, and the control machine detects the signal and then transmits a modulation signal to an infrared probe. The modulation driving board receives the modulation signal and then drives the brushless DC motor to stably operate at the designated rotating speed in a high-speed way so as to drive the radiation modulation disc to rotate at the designated speed to modulate axle temperature infrared radiation of the train into radiation flux of which the amplitude continuously changes along with time. Advantages of the infrared axle temperature detection system modulation type probe infrared radiation modulation device are that the device is based on the principle of digital pulse width modulation and is high in precision, high in regulation speed, high in anti-noise performance, low in cost, low in power consumption, flexible to control and great in dynamic response.

Description

technical field [0001] The invention belongs to the field of train safety monitoring, and in particular relates to a modulation type probe infrared radiation modulation device and a driving method of an infrared shaft temperature detection system driven by a brushless DC motor controlled by an improved digital PID technology and a PWM principle. Background technique [0002] When rail trains are running, the load-bearing bearings will generate heat due to friction. Under normal conditions, the bearing surface temperature tends to a stable value. When there is a fault inside the bearing, the friction will be intensified, the temperature of the bearing will suddenly rise, forming a hot shaft, and in severe cases, the shaft will be cut, causing the train to overturn, which is a major hidden danger to driving safety. [0003] The infrared shaft temperature detection system uses infrared rays to detect the non-contact temperature of the train shaft, which can effectively detect ...

AI Technical Summary

Problems solved by technology

If the work cannot be started within the specified time or the stability is not enough, the infrared axle temperature detection system will lose the car, the axle and other failures. In addition, due to the harsh natural environment and electrical environment of the infrared axle temperature detection system on site, equipment maintenance and repair are difficult and expensive. High, so the infrared radiation modulation device with fast response speed, long life and high stability is a necessary condition for the infrared shaft temperature detection system to obtain high reliability and high stability

[0006] At present, infrared probe radiation modulation devices are mainly composed of synchronous motors, brushed motors, and brushless motors. However, due to the performance characteristics of the motor itself and the design of the drive device, etc., there are generally poor reliability, high heat generation, and high repair rate. , low startup response rate and other defects

At the same time, when the system encounters lightning strikes or other harsh electrical environments, the modulation performance is unstable and the failure rate of the drive device is high

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