Electric Motor Balancing 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.

Electric motor balancing standards.

The degree to which a motor is out of balance. 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. Specification and verification of balance tolerances gives specifications for rotors in a constant rigid state according to their machinery type. Rigid rotors only example.

In this post we will examine balancing standards and how you can ensure you get a quality repair. 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. This second edition cancels and replaces the first edition iso 1940 1 1986 which has been technically revised. Balance grade g2 5 is recommended for steam turbines machine tools and small electric armatures.

The iso 1940 standard defines balance grades for different classes of machinery. Subcommittee sc 1 balancing including balancing machines. Balance grades balance grades are used to specify the allowable residual imbalance for rotating machinery. Electric motor balancing at hi tek balancing is performed by mounting the entire motor on a balancing fixture.

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. 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. Easa standards dated february 1995 section 2 page 2.

Part 1 and by german standards as vdi 2060. Based on experimental data the potential for damage is proportional to the balancing quality grade. Greater emphasis is presented in this tutorial on field balancing which applies to balance correction in situ on rotating machinery and. This reads as follows dynamic balancing should be to the level specified by the customer.

Iso 1940 1 requires an understanding of balancing and its terminology if the standard is to be understood and. The most important change is the introduction of reference planes for balance tolerances instead of using the correction planes as tolerance planes. How motor rotor balancing affects motor life. Larger g numbers cause more structural stress.