Pit-buried cryogenic motor type experiment device and tested motor temperature rise calculating method

Abstract

The invention discloses a pit-buried cryogenic motor type experiment device and a tested motor temperature rise calculating method. The device comprises a load, a lifting mechanism, a coupling, a cryogenic device, and control test equipment. The load is vertically installed on the lifting mechanism. The cryogenic device installed in a ground pit. A tested motor is vertically installed in the cryogenic device by means of bottom fixing. The cryogenic device includes a liquid nitrogen can, liquid nitrogen, and a cryogenic resistant insulation shell. The advantages are as follows: as liquid nitrogen sealing is not involved, energy loss caused by liquid nitrogen sealing for preventing liquid nitrogen from flowing out from the shaft extension during horizontal installation is avoided; the efficiency and technical parameters of the motor can be measured accurately; the test precision is equivalent to that of a conventional motor type test bench; and potential threat to the human body due to low-temperature liquid nitrogen leak is avoided effectively. The resistance of the tested motor is measured using the power line of the tested motor. The problem on how to measure the temperature rise in a cryogenic state is solved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a pit-buried cryogenic motor type experiment device. Background technique [0002] The type test of the motor includes many items, such as no-load current, no-load loss, efficiency, temperature rise, starting torque, maximum torque and so on. The detection of these items must be the same or similar to the actual working conditions, and there should be no big difference. For ordinary motors, the general motor test station can fully meet the requirements. However, for cryogenic motors, since the operating temperature (below -100°C) is much lower than room temperature, the resistance of the motor winding has changed greatly. The situation is seriously deviated, which loses the significance of the experiment. [0003] In addition, the temperature rise test of the conventional motor is to measure the surface temperature of the motor with a thermometer. When the change of the surface ...

AI Technical Summary

Problems solved by technology

However, in a cryogenic (below -100°C) environment, due to the large temperature difference from the room temperature, the ambient temperature of the laboratory can no longer meet the test conditions of the cryogenic motor, so a cryogenic device is necessary

[0007] 2. Even if a cryogenic device is added to the existing test station, the precise test of the cryogenic motor cannot be realized;

Not to mention the difficulty in selecting low-temperature sealing materials, the measurement error caused by the energy loss caused by the sealing device alone cannot guarantee the authenticity of the key data such as the efficiency, torque, and current of the motor

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