Hollow coaxial drag motor test bench for real-time measurement of motor rotor temperature rise

Abstract

The invention discloses a hollow coaxial mutual-driving motor test bed for real-time measurement of motor rotor temperature rises. Rotors of two mutual-driving motors share a same mutual-driving common hollow rotating shaft, and the two mutual-driving motors are mounted in a casing; two ends of the mutual-driving common hollow rotating shaft are sleeved with the motor rotors, and motor stators are mounted on peripheries of the motor rotors; air cooling channels, water cooling channels and cooling fins are arranged on the casing; temperature sensors are mounted in central holes of the mutual-driving common hollow rotating shaft and connected onto sliding rings, the sliding rings are mounted on the circumferential surface of the mutual-driving common hollow rotating shaft outside the casing, and electric brushes are arranged on two sides of the sliding rings and connected with an external signal processing module. The mutual-driving motors are connected coaxially, so that stress and vibration caused by insufficient coaxiality of a coupler during high-speed rotation are avoided; the hollow shaft structure can facilitate embedding arrangement of the temperature sensors, and temperature signals of the rotors and the rotating shaft are acquired; a function of externally and statically extracting an internal temperature rise signal of the dynamic rotating shaft is realized through structures of the electric brushes and the sliding rings.

Description

technical field [0001] The invention relates to a motor test stand, in particular to a hollow coaxial paired motor test stand for real-time measurement of motor rotor temperature rise. Background technique [0002] High-speed permanent magnet motors have the advantages of high efficiency, reliable operation, high power factor, and good control characteristics, and have become a new development direction for high-speed motors. A high-speed motor with a speed of tens of thousands of rpm has significant advantages in terms of size and weight, but its outstanding problem is the heat dissipation problem under wind friction loss and high-frequency electromagnetic loss, which is more important for high-power miniaturized high-speed motors. challenge. For permanent magnet motors, the temperature rise of the rotor will bring more serious problems: the permanent magnets on the rotor are limited in centrifugal force and need to be protected by an external sheath; magnetic. In order ...

AI Technical Summary

Problems solved by technology

For permanent magnet motors, the temperature rise of the rotor will bring more serious problems: the permanent magnets on the rotor can bear limited centrifugal force and need to be protected by an external sheath; magnetic

Due to heat loss during disassembly, even corrected deviations

The non-contact temperature measurement method is mostly infrared temperature measurement, which needs to provide relevant physical parameters (such as radiation coefficient, etc.), and the measured temperature is the average temperature of the measured temperature field, and the accuracy is low

Images