An electric motor has 4 rotor bars and runs at 2980rpm. A vibration analysis shows significant radial vibrations at 1x, 2x, 3x and 4x the running speed of the motor. A very large peak shows at a frequency of approximately 12,000cpm. What would you suspect the problem to be and how would you confirm your suspicions?

An electric motor has 4 rotor bars and runs at 2980rpm. A vibration analysis shows significant radial vibrations at 1x, 2x, 3x and 4x the running speed of the motor. A very large peak shows at a frequency of approximately 12,000cpm. What would you suspect the problem to be and how would you confirm your suspicions?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

The free response of » damped two egree-of-reedom system has two modes of bration,both of which are underdamped. Explain this sentence
10) In a forced damped vibratory system, why does the maximum vibration amplitude shift to the right as the damping ratio decreases? (e.g., why higher damping ratio cases need lower frequency to exhibit their maximum amplitude?) 11) Consider a 2-DOF undamped system, (e.g., m1= m2 with k1=k2=k3%3k). What are the two modes of vibration? (e.g., modals) 12) If you are to approximate the vibration of your car by only two degrees of freedom, what would they be?
Show the complete solution for this force vibration without damping equation.
Vibrations Engineering:
For a worker that exposed frequently to hand-arm vibration, it can lead to two forms of permanent ill health known as Hand-Arm Vibration Syndrome (HAVS) and Carpal Tunnel Syndrome (CTS). State two (2) symptoms and the effects of these ill health.
The free vibration response of a 500 N electric motor mounted on aThe foundation consisting of springs and dampers is shown in the following figure.Define:a. Logarithmic decrementb. Damping factorc. System private frequencyd. Damping coefficiente. Spring constant
Vibrations Engineering: r = 0.25 m initial angle = 1.25 radians initial angular speed = 4 radians per second Calculate: (Express the final answer in 4 significant digits) -the amplitude in radians -the phase angle in radians -the natural period in second
If stiffness of a spring is doubled and mass is halved, what will be percent change in its natural frequency?
If wo = 106 rad/s, Q, = 5 × 10² and m = 10-1ºkg, calculate the stiffness, and resistive constant (b) of the system. S For a driven damped oscillator, show that the energy dissipated per cycle by a frictional force Fa = bv at an angular frequency (@) is given by: E = nbwA².