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  1. NotecA

    Help identifying the source of vibration

    You mentioned that the vibration on the motor mounts is higher than on the bearing housing. The vibration on the motor casing is almost within tolerance (2.8 mm/sec), but it's over 7 on the mount. In which direction did you measure the vibration ? Vertical, horizontal or axial ? The first...
  2. NotecA

    High Non-Synchronous vibration with harmonics on Vertcal motor

    What caused the vibration ? Did the vibration increase smoothly over time, or did it occur suddenly? Did you carry out any repair work or install a new unit? How is it secured to the frame and foundation? Can you take some pictures? At first glance I would inspect the structure for resonances...
  3. NotecA

    Balancing of Rotor during Electric Motors Overhauling

    Of course g*mm, thank you. By motor anchor, I mean the rotor. For the balancing process, a portable balancer Balanset-1A was used. You rightly noted that the correctly chosen rotation speed plays a significant role in such a setup. To ensure the sensors' sensitivity is adequate, a high...
  4. NotecA

    Runout tolerance and balancing

    Static imbalance of a rotor occurs without its rotation, in a stationary state. In this case, the rotor, under the action of gravity, rotates so that its "heavy point" is at the bottom. An example of a rotor with static imbalance can be seen in the figure: Static imbalance of a rotor Dynamic...
  5. NotecA

    Balancing a Vertical Pump Motor on a rubber base

    Balancing at the resonance frequency is generally impossible (with rare exceptions), and anything can resonate: the fan itself, some cover, or the table it is all mounted on. And finding exactly what resonates can take quite a bit of time. Using spring vibration isolators allows you to detune...
  6. NotecA

    Balancing a Vertical Pump Motor on a rubber base

    1X vibration amplification refers to the increase in vibration amplitude occurring at the fundamental (or 1X) speed of the machine. This frequency is equal to the rotor or shaft speed. Vibrations at this frequency are the most typical and are usually associated with rotor unbalance. In simple...
  7. NotecA

    Balancing a Vertical Pump Motor on a rubber base

    The resonant (natural) frequency of the system depends generally on the mass, frame stiffness and damping. There are two simple experimental ways to determine the resonance. 1. Spin the rotor to the maximum frequency, turn off the rotor rotation and observe the vibration level until the rotor...
  8. NotecA

    DIY crankshaft balancing with an oscilloscope

    Good day ! Why did you decide to make a hall sensor and not, for example, a laser tachometer or an optical speed sensor? I would make the struts shorter and the bands holding the support longer.
  9. NotecA

    Balancing of Rotor during Electric Motors Overhauling

    Balancing of the motor rotor is recommended for every overhaul, regardless of the type of work carried out. At least check the vibration level according to ISO 10816 . To speed up the measurement process, I advise you to make a simple balancing stand, which consists of a platform on spring...
  10. NotecA

    Balancing a Vertical Pump Motor on a rubber base

    The most important thing in the motor balancing process is to avoid a situation where the natural frequency of the system vibrations coincides with the motor rotation frequency. This phenomenon is called resonance, and it can lead to a significant increase in vibration amplitude. In the context...

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