How to see the elevator energy-saving space from the classification of elevator energy consumption, elevator decoration and decoration company tells you:
The energy consumption of different working conditions is as follows:
1. Standby conditions:
The elevator does not work continuously. The standby time is usually much longer than the time when the car runs up and down. Therefore, the power consumption of the standby condition can not only be neglected, but also has considerable loss. In standby mode, part of the electrical energy consumed by the elevator (E waiting) is consumed in the control and display circuits in the machine room, car and landing, and the other part is consumed in the car lighting and exhaust facilities.
In such a working condition, if the elevator is to be more energy-efficient, when there are multiple elevators, other elevators can be closed during the peak hours of the non-use elevators, leaving only one elevator to operate. Or the lighting facilities in the elevator adopt led energy-saving lighting facilities, the exhaust air facilities can be set to work regularly, and effective measures are taken to save energy for the elevators while ensuring that the elevators can be used normally.
2. Drive condition:
In the driving condition, in addition to the consumption under standby conditions, the electric energy consumed by the elevator (E-drive) also includes the following aspects: one is the power consumption of the switch door; the other is the loss of the inverter device, including the filter, the rectifier, and the inverse All circuit losses from the three-phase power input to the inverter output in the main circuit including the transformer; the third is the traction machine loss, including the loss of the internal mechanical transmission of the traction machine; the fourth is the loss generated by the traction system Including the energy loss from the start of the traction wheel rotation to the whole process of driving the car through the traction wire rope. After this series of losses, the electric energy is converted into the kinetic energy (W) and the potential energy (W potential drive) required for the elevator to operate. It should be noted that the traction type elevator has a very large power consumption under different load conditions due to the action of the "weight-receiving mechanism", so the energy efficiency under different load conditions is quite different.
I have done a set of tests to make the same model of Otis 18ATF elevator work under 0%, 25%, 50%, 75%, 100% load, and back and forth ten times, test the elevator's power consumption. Happening. The test results show that the power consumption of the elevator under the condition of no load and full load exceeds the power consumption of the half load, and the probability of the elevator being fully loaded with load is far greater than the half load. Therefore, an elevator energy-saving method that can achieve more energy-saving at the time of empty full load becomes more and more important in the process of saving society.
3. Regeneration (feedback) working conditions:
The energy flow under regenerative (feedback) conditions is relatively complicated. On the one hand, the electric energy (E) of the elevator is consumed by the switch door motor, the control and the display circuit, and is converted into part of the kinetic energy (W moving) of the car and the load by the frequency converter and the traction machine; on the other hand, the car and the load The potential energy (W potential) is converted into the kinetic energy of the car and the load (W), and the other part is fed back to the inverter through the traction system and the traction machine. For elevators with energy feedback function, the inverter will feedback this part of energy (E back) to the grid through inverter and filtering. For elevators without energy feedback function, this part of energy will be consumed in the heat dissipation resistance of the inverter.
For electrical parts manufacturers, how can this part of the feedback energy be taken away by the regenerative resistor? Escape the elevator brand model, the elevator power feedback device brings better and more efficient energy-saving methods for elevators without energy feedback. This kind of equipment does not affect the original control system of the elevator, and is connected in parallel with the elevator braking resistor to replace the original heat dissipation resistor of the elevator. Using PWM pulse width modulation technology and DSP central processing unit, the (E back) is converted into a nearby office. The regional power supply network has the same phase, the same voltage, and the same frequency of AC energy, which will be sent to the regional AC power grid for use by nearby power equipment to achieve energy saving in the elevator.
