Air Cooled Servo Stabilizer

Air cooled servo stabilizers are the right specification for the majority of Indian industrial applications where the load is moderate, the duty cycle allows for adequate airflow around the unit, and the ambient temperature in the installation location remains below 40°C. They are lighter than oil cooled equivalents, lower in installed cost, easier to transport and install, and require no oil maintenance over their operational life. For the right application, an air cooled unit from Voltaire will run reliably for ten to fifteen years without significant maintenance intervention. The key to getting this performance from an air cooled unit is correct application selection and correct sizing — not simply buying any air cooled unit at the nominal capacity your machines require. An air cooled stabilizer operating continuously at 95% of rated load in a 42°C factory environment will degrade significantly faster than one sized with adequate thermal headroom for those conditions.

In an air cooled servo stabilizer, heat generated in the transformer windings and servo motor during regulation is dissipated by natural convection and forced airflow through ventilation grilles in the enclosure. The design assumes a defined ambient temperature ceiling, sufficient clearance around the unit for air circulation, and a duty cycle that allows the unit to shed heat between heavy-load periods. When these assumptions hold, air cooling is perfectly adequate and has a real cost and maintenance advantage over oil cooled equivalents. When they do not — when ambient climbs above 40°C, when the installation location is enclosed, or when the load is continuous and heavy — the transformer runs hotter than its insulation class rating and degradation accelerates. This is why correct application selection matters more than the nominal kVA rating on the nameplate. Our engineers account for your ambient conditions, duty cycle, and load profile in every air cooled unit we specify.