A motor vibration test device under load

Abstract

The invention aims at providing a motor vibration testing device under a loading state. The testing device includes a magnetic-powder dynamometer, a piezoelectric acceleration sensor and a base. The magnetic-powder dynamometer is installed on the base. A tested horizontal motor is installed on the base through a piezoelectric sensor and a connecting device of the piezoelectric sensor. A shaft of the tested horizontal motor is installed on a bearing of the tested horizontal motor. The magnetic-powder dynamometer is used as a load and connected with the shaft of the tested horizontal motor through an elastic coupler. The piezoelectric acceleration sensor is arranged on the outer wall at the outer side of the bearing of the tested horizontal motor. The magnetic-powder dynamometer integrates a strain-type torque sensor and a magnetoelectric rotation-speed sensor. The motor vibration testing device under the loading state is capable of assessing more comprehensively a motor, particularly vibration characteristics of the motor under the loading state and perfecting motor vibration including motor excitation testing schemes so that the testing device is capable of testing the vibration characteristics of the motor under a no-load and loading work state in a trusted manner.

Description

technical field [0001] The invention relates to a vibration test device, in particular to a motor vibration test device. Background technique [0002] As a power source, electric motors are an important part of many installations. The vibration characteristics of the motor must be considered when designing for low noise in such devices. "GB10068-2008" is a traditional motor vibration test method. This method stipulates that the motor does not have a load device, and it can only investigate the motor vibration under no-load conditions without any load. However, the actual use of the motor is to run with load, and once it runs with load, the characteristics of the stator and rotor magnetic field of the motor will be affected. Especially for induction motors, the slip rate of the motor will change greatly after loading, and the frequency and magnitude of the electromagnetic pulsation excitation force generated by the interaction between the stator and rotor magnetic fields wi...

AI Technical Summary

Problems solved by technology

However, the actual use of the motor is to run with load, and once it runs with load, the characteristics of the stator and rotor magnetic field of the motor will be affected

Especially for induction motors, the slip rate of the motor will change greatly after loading, and the frequency and magnitude of the electromagnetic pulsation excitation force generated by the interaction between the stator and rotor magnetic fields will change. The difference, the method of "GB10068-2008" cannot obtain the vibration of the motor under load

[0003] As the driving power source, the motor is often connected to mechanical loads such as reciprocating pumps, centrifugal pumps, fans, screw pumps, and gearboxes in engineering applications. The vibration sources such as the pulsating torque and pulsating force of the mechanical loads are often greater than the vibration sources of the motor. In the mechanical load device driven by the motor, the vibration of the motor itself is covered, and the vibration of the motor itself under load cannot be obtained

[0004] The traditional motor vibration test only examines the vibration acceleration of the motor bearing installation, which belongs to the vibration of the motor itself, without considering the impact of the motor on the vibration of the equipment after the motor is installed, which is not conducive to the design of low-noise equipment

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