Motor-Drive Mechanism The motor-drive mechanism provides the drive to al- low the tap-changer to operate. As the name implies, drive is provided from a motor through a series of gears and on to a spring energy storage device, which when fully charged, operates the tap-changer via a drive shaft. Several features are incorporated within the mechanism to promote long service intervals and reliability. For a detailed operating description, see the section "Principles of Operation" contained in this guide. Accessories for the Motor-Drive Mechanism Accessories for the motor-drive mechanism are de- scribed on pages 19-20.
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