An on-line temperature probe for motor rotor

Abstract

The invention discloses an online motor rotor temperature measuring probe which comprises a reflector, an infrared light source, a focusing mirror, a receiving element, a light filter and a heat insulation sleeve. The probe is integrally protected by the heat insulation sleeve, screwed on a shell or an end cover and different from a common infrared temperature measuring probe, the probe effectively overcomes the shortcomings of unstable reflection and polarized light of a rotor surface caused by rotation by the aid of the light filter, a measuring element is mounted in the heat insulation protection sleeve, heat shock of heat conduction on a photoelectric element is relieved, and mechanical shock of body vibration on the elements is decreased when a motor runs. The probe has the advantages that the probe is accurate in measurement and fine in safety, the effect on the structure of the motor is low and the like, the probe can be conveniently and rapidly mounted on the end cover of the motor, the temperature of the end face of the rotating rotor is continuously measured in real time, and the probe effectively solves the problems that heat loss and safety risks caused by a window formed in the end cover in the past, temperature measuring test paper is pasted on the surface of a rotor, the highest temperature can only be inspected in a split manner, and the temperature change process cannot be reflected.

Description

technical field [0001] The invention relates to the field of motor detection, relates to a temperature measuring device, in particular to an online temperature measuring probe of a motor rotor. Background technique [0002] The rotor temperature and its changing trend during the operation of the motor are important indicators to reflect the quality of the motor, especially for permanent magnet motors. The flux-temperature characteristics of the permanent magnet materials on the rotor determine the overall performance of the motor. When the cage rotor rotates at high speed, it cannot be directly measured by the contact temperature measurement method, and it is often necessary to detect the surface temperature of the rotor during the motor test process. At present, it is mainly realized by two methods: 1. The method of opening the window of the end cover. This method is to open the window on the end cover of the motor, and usually cover it with a movable cover. Measurement. ...

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that the internal heat of the motor will be dissipated in large quantities when the window is opened, and the use of ordinary infrared temperature measuring instruments cannot eliminate the errors caused by the discontinuous reflection of infrared rays and polarization caused by the surface of the rotor when the rotor rotates at high speed, which makes the measurement results very difficult. Large deviation, and the opening of the window also brings great risks to the personal safety of the measuring personnel; 2. Temperature test paper, this method is to paste the temperature test paper on a specific position on the rotor surface in advance, and measure the rotor temperature by checking the test paper indication after the test is over

Obviously, the temperature test paper cannot obtain the rotor temperature in real time, and can only wait for the motor to be disassembled after the test

When testing permanent magnet motors, it is unacceptable if the rotor temperature cannot be known in time to cause the material to lose magnetism during the test

Moreover, the test paper may be blown off under high-speed rotation

Images