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What is a transformer fan speed controller for AC motors?

Transformer fan speed controllers regulate fan speed in steps by reducing the motor voltage. Usually fan speed can be regulated from low to high speed in 5 steps. To reduce the motor voltage, these fan speed controllers use autotransformer technology. Autotransformers are electrical transformers with a single coil. Via their different voltage taps, reduced voltages are available. The single winding of an autotransformer acts both as primary and secondary winding simultaneously. This results in a smaller and lighter construction compared to classical dual-winding transformers.
    Transformer fan speed controller  
Transformer fan speed controllers are easy to install. Thanks to the simple, robust construction, these speed controllers are extremely reliable and easy to use. They don't require any configuration. Once installed, they can be used immediately.
The Sentera product range features fan speed controllers for 1ph 230 Volt, 3ph 230 Volt or 3ph 400 Volt AC voltage controllable motors. Typically, they are used to regulate fan speed or pumps in HVAC applications. 
Despite the fact that we manufacture our autotransformers with a special impregnated coating to reduce noise, the controller might create a light humming noise in some circumstances. Since the motor voltage always has a perfect sinusoidal shape, the motor will not produce extra noise.
These types of fan speed controllers offer you advantages in terms of comfort - optimisation of the supply of fresh air in your building, in terms of health - improvement of the indoor air quality as well as in environmental terms - thanks to the optimised airflow, your ventilation system will be more energy efficient.
Understanding fan speed control
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