Induction Motor Vibration

February 06, 2017

We have did solo run test to a squirrel cage induction motor at our construction site. Since ac power is supplied as a sinusoid each pole of the motor is energized twice once with a peak and once with a peak during each cycle.

An Analytical Approach To Solving Motor Vibration Problems

China 1500rpm Low Vibration 90kw 125hp 3 Phase Ac Induction

59 Vibration And Motor Current Analysis Of Induction Motors

The effect on the bearings is no greater or less than the same amplitude due to unbalance.

Induction motor vibration. In this example electromagnetic force generated in the induction motor stator core is obtained and an example of evaluating sound pressure by linking it with the eigenmode of the motor is shown. These have a free exchange of internal and. Electrically generated vibrations the supply of ac power to a motor generates mechanical vibration.

Is airborne and will not produce vibration of the yoke as does structure borne magnetically generated noise see figs. It is important to realize that vibration at 2 x fline is a normally occurring vibration. Live with it or buy a new motor.

Motor vibration shall be measured in a tri axial direction ie. The speed of rotation of the magnetic field pules is exactly 60 hz for two. Vibration diagnostics for industrial electric motor drives the induction motor is the most widely employed industrial electric drive.

Understanding the vibration forces in induction motors 69 pole motors fijur times in one rotation of the magnetic field for four pole motors six times for six pole motors etc. If the motor has proximity probes you typically mount them at a 450 offset from both sides of the upper vertical centerline. The primary sources of air flow and windage noise in an induction motor are the fans and the rotor bars in the vents areas and at the rotor ends.

Induced currents in the rotor interact with the magnetic field that is produced by the coils to generate the driving torque on the rotor. Although any motor can be adversely affected 2 pole machines are especially vulnerable to soft foot problems due to the eccentric electromagnetic forces within the air gap of their design. In the vibration in an induction motor tutorial model eddy currents are induced in the rotor by time harmonic currents in the stator windings and rotation of the rotor.

Do not confuse the presence of a running speed harmonic with a pole pass frequency sideband. Home technical articles testing and commissioning procedure for electric motors. Identifying the vibration problems that can occur in induction motor drives have an added complexity due to the rotating magnetic fields in the machine.

Take shaft vibration measurements in two directions 900 apart on one drive end of the motor. Soft foot soft foot can play a major influence in the vibration of an induction motor. Point x axis side of bearing housing at shaft height.