Motor torque ripple test bench and test method

Abstract

The invention relates to a motor torque ripple test bench and a test method, a synchronous belt transmission structure is arranged, and the precision of the rotation position of a rotor is accuratelycontrolled through a large belt wheel. Through multi-position stalling, the torque ripple condition of the rotor in one cycle can be obtained; a torque sensor is used in a low-frequency region, and anangular acceleration sensor is used in a high-frequency region, so the measurement range of cogging torque is expanded; the method is suitable for measuring the cogging torque of the full-frequency region of the motor. According to the test bench, the locked-rotor and inertia loading are combined, the torque ripple condition of the motor in a rotation period can be represented through a locked-rotor method on one test bench, and the cogging torque ripple condition of the motor can also be directly tested. And the torque ripple influence of the dynamometer can be reduced as much as possible through the large-inertia flywheel. In addition, the elastic coupling is adopted to eliminate the influence of coaxiality, the eccentricity and vibration in the transmission chain on the sensor side, and the sensor is prevented from being damaged due to vibration.

Description

technical field [0001] The present application relates to the field of motor testing, in particular to a torque ripple test bench and a test method combining locked rotor and inertial loading. Background technique [0002] In the electric drive system, torque ripple is an important source of motor vibration and noise, and is one of the key issues to improve the quality of the electric drive system. Torque ripple can also cause torque vibration, which may cause the motor to resonate, increase various losses, shorten the life of the motor, and reduce the reliability and stability of work. Therefore, it is very important to accurately test the motor torque ripple with the design of the electric drive system and the optimization of the motor body and control system. The main reasons for the torque ripple of the motor are the cogging torque of the motor itself and the unbalanced magnetic pull on the rotor shaft due to machining errors. [0003] Some existing torque measurement ...

AI Technical Summary

Problems solved by technology

This method is simple to operate, but there are too few considerations, and it is easily affected by load fluctuations and mechanical structure resonance during the measurement process, resulting in large errors.

And subject to the torsion bar stiffness cannot be changed in a large range, it can only be used at low speeds, and the test range is narrow

Although the balance method overcomes the torque fluctuation in the transmission process compared with the direct method, it still uses a load, which cannot avoid load fluctuations, and the motor under test needs to protrude from both ends, so it is not suitable for testing ordinary motors

The stator-rotor separation method, although it has made breakthroughs and innovations in avoiding non-measurement torque fluctuations, it is still not widely used in the measurement of motor torque fluctuations.

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