Electric Motor Balancing Standards

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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 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. 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. The easybalance software has a built in balancing quality calculator for iso mil api and special standards like 4w n and such. Greater emphasis is presented in this tutorial on field balancing which applies to balance correction in situ on rotating machinery and.

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. The electric motor balancing fixture is equipped with. 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. Subcommittee sc 1 balancing including balancing machines.

The iso 1940 standard defines balance grades for different classes of machinery. In this post we will examine balancing standards and how you can ensure you get a quality repair. Based on experimental data the potential for damage is proportional to the balancing quality grade. The international standards organisation iso publishes several standards which are the global benchmark for industrial balancing.

This second edition cancels and replaces the first edition iso 1940 1 1986 which has been technically revised. The most important change is the introduction of reference planes for balance tolerances instead of using the correction planes as tolerance planes. This reads as follows dynamic balancing should be to the level specified by the customer. Specification and verification of balance tolerances gives specifications for rotors in a constant rigid state according to their machinery type.

How motor rotor balancing affects motor life. Iso 1940 1 2003 mechanical vibration balance quality requirements for rotors in a constant rigid state. Larger g numbers cause more structural stress. Iso 1940 1 requires an understanding of balancing and its terminology if the standard is to be understood and.

Balance grade g2 5 is recommended for steam turbines machine tools and small electric armatures. The degree to which a motor is out of balance. Part 1 and by german standards as vdi 2060. Electric motor balancing at hi tek balancing is performed by mounting the entire motor on a balancing fixture.

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