At present, most of the elevators in use on the market are non-energy-saving elevators, with low utilization rate, high power consumption, and high power loss. The cost pressure of the elevator management department is also great. Judging from the existing elevator renovation technology, the original old elevator has great potential for energy saving and electricity saving. Therefore, it is very important to carry out energy saving renovation on the elevator.
Install electric energy feedback device in elevator The most widely used technology for energy-saving renovation of old elevators is the installation of electric energy feedback devices in elevators. The elevator electric energy feedback device uses advanced power electronic technology and high-performance JGBT as the switching device. Its biggest advantage is that it can recover the wasted electric energy generated by the machine during the operation of the elevator. Under normal circumstances, when the elevator is lowered from a high place, the elevator releases energy. This energy is usually lost by the braking resistor. The power of this braking resistor is quite large, often accounting for more than 50% of the rated power of the elevator motor. Utilizing these wasted electrical energy for recycling is exactly the problem to be solved by the elevator electrical energy feedback device. When the elevator rises, a large amount of electric energy is used, and the electric energy feedback device of the elevator can store and utilize the electric energy lost by the braking resistor to achieve the effect of energy saving. After testing the elevator to install the electric energy feedback device, the lost electric energy is recovered and used through the electric energy feedback device, eliminating the resistance heating element, greatly reducing the temperature of the machine room, not only saving the summer elevator machine room air conditioning costs, but also effectively improving The operating temperature of the elevator control system virtually extends the service life of the elevator. After the elevator is equipped with an electric energy feedback device, the energy saving rate can be as high as about 25%. Depending on the frequency of elevator use, the cost recovery period for purchasing and installing an electric energy feedback device is about 6-12 months, and the average service life of an electric energy feedback device is 10-15 years, which is equivalent to the average service life of an elevator. The installation of electric energy feedback devices on the original old elevators is an effective means for energy-saving management of elevators, which can greatly reduce the operating costs of elevator management departments and extend the service life of elevators.
Install variable frequency drive in elevator In the elevator energy-saving management application technology, the elevator frequency conversion speed regulation technology has been widely used in the elevator drive control system. It eliminates all kinds of AC two-speed motor speed control drives and replaces DC gearless drives, which not only optimizes the elevator's operating performance, but also greatly reduces the elevator's electrical energy consumption. After the elevator is installed with a variable frequency speed control drive device, the mechanical kinetic energy released by the elevator traction machine and the mechanical potential energy generated during the operation of the elevator, that is, the excess mechanical energy (including potential energy and kinetic energy) during elevator operation, can be converted into the elevator motor and the frequency converter. The DC power is stored in the capacitor in the DC circuit of the frequency converter, and the external regenerative energy inverter will be used to actively invert the excess mechanical energy during elevator operation and send it back to the grid in time and efficiently to form a two-way flow of energy to perform energy Direct use and reuse can effectively reduce energy consumption and have significant energy-saving effects.
Install permanent magnet synchronous motor drive device in elevator The use of permanent magnet synchronous motors in elevator drive systems is another application in elevator energy-saving technology. This type of motor is mainly used to control the elevator door machine, evaluates and detects the position of the motor rotor flux through an incremental encoder, and automatically Calculate the speed of the parameters and perform vector control on the motor, so that the power factor of the motor can reach a very high level. This kind of motor is a low-frequency, high-torque alternating current drive motor, which can effectively control the operation of the permanent magnet synchronous door motor. Its structure is simple, no additional mechanical deceleration mechanism is needed, and the performance is reliable, the control is accurate, and the permanent magnet synchronous motor is There is no current through the rotor, and there is no rotor loss problem. The loss of asynchronous motors is reduced by about 50% compared with the same period of the previous year, which has a good energy-saving effect.