Liebert Motor Generator (1970s)
Photo courtesy of Jason, atwww.datasales.com and www.azteksales.com.
In early large-scale computers, the machines were very sensitive to changes in electrical voltage. In environments where the available electrical power was subject to spikes or variance, devices such as the above "Motor Generator" were used to provide a stream of electrical voltage and current. The raw power (from the available electrical lines) was used to run the motors, and the motors were connected to a flywheel and to generators. The generators were kept turning at a constant rate and provided a smooth flow of power to the computer systems.
History of Computing
An Encyclopedia of the People and Machines that Made Computer History
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