# Nola controller

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### #1 Daniel

Daniel

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Posted 29 October 2003 - 02:03 PM

The theory of Nola controller is to lower the voltage to achieve saving on inductive motor. I am thinking is it possible to apply this theory in the unity pf appliance?like lightings.

### #2 marke

marke

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Posted 29 October 2003 - 06:11 PM

Hello Daniel.
Yes, by reducing the voltage on lighlty loaded induction motors, it is possible to improve their efficiency and thereby save energy. This is part of the Nola principle.

In the case of devices that are already operating at full efficiency, such as lamps, reducing the voltage will reduce the power consumed, but will also reduce the outputpower. Essentially, what you are proposing is a dimmer for lamps.

The Nola system is only for lightly loaded motors.
Best regards,

### #3 Daniel

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Posted 30 October 2003 - 09:09 AM

If someone told me their device can reduce the RMS power by modified the wave form to the fixture but the peak voltage still intact, is that true? and what does it mean?

### #4 marke

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Posted 30 October 2003 - 10:09 AM

Hello Daniel

This type of technology is SCR or triac based and the voltage is controlled by varying the conduction angle of the SCR (or triac). This is done by phase control, which means that the SCR is triggered ON after the voltage zero crossing. Once the SCR is turned ON, it remains conducting until the voltage across it goes through zero. In a single phase system into a resistive load, for half power, the SCR would be triggered on at 90 degrees after the voltage goes through zero. This results in current flowing for the second half of each half sine wave only. i.e. from 0 to 90 degrees, no current flows, then from 90 degrees to 180 degrees, current flows. etc
At any instant after the SCR has been triggered on, the voltage amplitude is the same as a non controlled waveform. i.e. at 120 degrees the voltage is the same for a controlled or non controlled system provided that the trigger point is before 120 degrees.
Best regards,

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