A frequency changer is a motor-generator set that changes power of an
alternating current system from one frequency to one or more different
frequencies, with or without a change in the number of phases, or in
voltage. Sometimes a converter is used to accomplish this.
![Figure 1. Frequency changers at a transportation substation Figure 1. Frequency changers at a transportation substation](https://webarchive.library.unt.edu/web/20090509222946im_/http://www.osha.gov/SLTC/etools/electric_power/images/frequency_changer.jpg)
Figure 1. Frequency changers at a transportation substation
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