With the continuous increase in the use of elevators, according to statistics on the electricity consumption of commercial buildings such as hotels and office buildings, elevator electricity consumption accounts for 17% to 25% of the total electricity consumption, second only to electricity consumption of air conditioners. The frequent braking of the elevator consumes a large amount of electric energy and the elevator energy saving has a large market space. At present, green energy-efficient elevators are not only a concept, but an important link directly linked to the economic benefits of construction operations. Although the elevator system only accounts for 4% of the construction company's investment, in the long run, it ignores this 4% investment. It will also bring no small economic losses.
The energy saving of elevators has undergone two changes. For the first time, inverter speed control is used instead of asynchronous motor voltage regulation and speed control to improve the operating efficiency of the motor. This is energy saving. Although the energy consumption of the elevator is greatly reduced after the inverter is used for speed regulation, a large amount of electric energy is still consumed in the braking resistor when the elevator brakes. Therefore, the second energy-saving change is to feed back the energy generated during elevator braking to the power grid for use in other nearby electrical equipment. This has actually become energy production.
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