Electric Motor Balancing Standards

In this post we will examine balancing standards and how you can ensure you get a quality repair.

Electric motor balancing standards.

Part 1 and by german standards as vdi 2060. Rigid rotors only example. Description and discussion is a review of api shop balancing methods as well as a review of iso standards related to shop and field balancing that are referenced by api standards. Adopted by the american national standards institute ansi as s2 19 1975 balance quality requirements of rotating rigid bodies it has also been adopted by british standards as bs 6861.

The degree to which a motor is out of balance. How motor rotor balancing affects motor life. Subcommittee sc 1 balancing including balancing machines. Based on experimental data the potential for damage is proportional to the balancing quality grade.

Many motor failures are mechanical and associated with the rotor and bearings so balancing has a direct effect on the life of the motor and productivity. Electric motor balancing at hi tek balancing is performed by mounting the entire motor on a balancing fixture. Balance grades balance grades are used to specify the allowable residual imbalance for rotating machinery. In the absence of a requested level dynamic balancing to balance quality grade g2 5 iso 1940 1 should enable the machine to meet final vibration limits as defined in 6 4 6 reference.

This reads as follows dynamic balancing should be to the level specified by the customer. Balance grade g2 5 is recommended for steam turbines machine tools and small electric armatures. Larger g numbers cause more structural stress. Specification and verification of balance tolerances gives specifications for rotors in a constant rigid state according to their machinery type.

The international standards organisation iso publishes several standards which are the global benchmark for industrial balancing. Easa standards dated february 1995 section 2 page 2. The electric motor balancing fixture is equipped with. The easybalance software has a built in balancing quality calculator for iso mil api and special standards like 4w n and such.

Iso 1940 1 2003 mechanical vibration balance quality requirements for rotors in a constant rigid state. Iso 1940 1 requires an understanding of balancing and its terminology if the standard is to be understood and. The motor shaft is rotated by an external motor to ensure that the only contributions to the vibration data is the dynamic unbalance of the motor and not it s operating noise. Greater emphasis is presented in this tutorial on field balancing which applies to balance correction in situ on rotating machinery and.