Rotor balance

Vibration grade signifies the accuracy of rotor balancing, e.g. N = normal, R = reduced, S = special. This may be based on the type of installation and the accuracy of the function the motor may have to perform. 

Cleanliness Hardness Hydrostatic Tests Blade Shaker (Static) Rotor balance O Standard O High Speed Final Surface Inspection Crating inspection Spare Rotor Fit ... 

Flexible rotor balancing must be performed with the rotor whirl configuration approximating the mode in question. The operating speed(s) is in the vicinity of a major flexible mode resonance (damped critical speed). As these two speeds approach one another, a tighter... 

Tessarzik, J.M., Badgley, R.H., and Anderson, W.J., Flexible Rotor Balancing by the Exact-Point Speed Influence Coefficient Method, Transactions... 

The value is lower than the. Ig would call for, but most users would prefer to install a compressor rotor balanced with some residual unbalance margin. 

Examination of the drive ratios shows that if both motors have ISOOrpm synchronous speeds that the pony motor is made to operate near 3600rpm when the big motor is operating. This is typically not a problem as to rotor balance or bearing duty because manufacturers make 3600 rpm versions of these same motors. Nevertheless, the duty should be checked and if this is a problem, the small motor can be changed to a 900 rpm model and the synchronous speeds of each motor will not be exceeded. 

Rotor balancing shall be performed as required in the specific pump sections. 

For rotor balancing, any vacant single keyways shall be filled with crowned half keys. 

Certified rotor balance data for multistage pumps. ... 

Make sure that the outsidb of the centrifuge tubes, the sample holders and sample chambers are dryr any liquid present will" cause an imbalarfce during centrifugation (as well as potentially causing corrosive damage-.to the rotor). Balanced tubes must be placed opposite each other, use a simple code if necessary, to prevent errors/... 

These experimental demonstrations confirm that silicon microfabrication is a valid approach to implement microturbines. The relatively simple stmctures survived the centrifugal loads at high speeds. In addition, rotor balancing was not... 

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