WP6-Brochure-E4 brochure - ELA European Lift Association.

LEDs are also a very efficient solution for displays which can be dimmed for even lower
consumption, and can be cycled on‐off without impacting their lifetime.
Figure 3‐32. Evolution of the Luminous Efficacy of different technologies
Design options such as high‐albedo interiors also help achieve a good lighting in the car.
Car ventilation also contributes to the energy consumption of the lift system. Electronically
controlled permanent magnet motors (EC motors) can achieve very high efficiencies and
competitive prices in variable speed applications. EC motors always require additional
electronics, responsible for the commutation in the windings depending on the position of the
rotor. To rotate the EC/BLDC motor, the stator windings should be energised in a sequence. It
is therefore important to know the rotor position in order to understand which winding will be
energised following the energising sequence. Rotor position is sensed using Hall Effect sensors
embedded into either the stator or the rotor, but new sensorless designs are becoming
available.
The development of motor technology combined with a global reduction in the cost of
electronics and power electronics over the last few years have made it possible to achieve EC
fan prices that are now broadly comparable to the costs of similar solutions involving the use
of AC induction motors. The external rotor design also contributed to the competitive price of
EC motors. They have a stator placed inside and the rotor placed outside, on which the
impeller or fan blades can be mounted directly. Thus, the motor is placed in the airflow and
benefits from this cooling effect. The design makes for a compact fan ‐ motor unit.
Especially with fans, setting the operating point to meet the required flow has a noticeable
impact on energy consumption, as the power consumed changes with the third power of
speed. Good speed control is also an important factor in regard to acoustic noise and
vibrations.
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