Energy-saving elevator and energy-saving method of elevator

Abstract

The invention discloses an energy-saving elevator. The energy-saving elevator comprises a hoistway, a lift car, a linear motor, an energy-saving device and a frequency converter. The lift car is located in the hoistway and connected with the inner wall of the hoistway in a sliding mode. Each linear motor comprises a primary module and a secondary module, the primary modules are installed on the lift car, the secondary modules are installed on the hoistway, and the primary modules and the secondary modules are oppositely arranged. The energy-saving device comprises a storage battery and a converter, and the converter is connected to the storage battery. The frequency converter comprises a rectifier module, a direct-current module and an inverter module, the direct-current module is connected with the rectifier module and the inverter module, the inverter module is connected to the linear motor, and the converter is connected to the direct-current module. Energy generated under the power generation working condition of the elevator motor is stored in the energy-saving device through the frequency converter direct current module, energy waste is reduced, and the problem that current converted by potential energy is fed back to a power grid, and consequently harmonic pollution of the power grid is caused can be solved.

Description

technical field [0001] The invention relates to the technical field of elevator energy saving, in particular to an energy-saving elevator and an energy-saving method for the elevator. Background technique [0002] When the elevator is ascending or descending, excess energy is generated, which must be released at this time to prevent damage to the elevator and other equipment. The traditional method is to connect braking resistors in series in the loop to let the elevator consume heat energy, but this method will cause energy waste, and a large amount of heat will reduce the service life of the resistors. Or feed energy back to the grid, and use the energy feedback unit to invert the regenerative electric energy into AC and send it back to the grid. However, energy feedback braking has high requirements for applications, and it can only be used when the grid voltage is stable, otherwise it will easily cause commutation failure and damage. At the same time, there will be harm...

AI Technical Summary

Problems solved by technology

The traditional method is to connect braking resistors in series in the circuit, so that the elevator will consume heat energy, but this method will cause energy waste, and a large amount of heat will reduce the service life of the resistors

Or feed energy back to the grid, and use the energy feedback unit to invert the regenerative electric energy into AC and send it back to the grid. However, energy feedback braking has high requirements for applications, and it can only be used when the grid voltage is stable, otherwise it will easily cause commutation failure and damage. At the same time, there will be harmonic pollution to the power grid during feedback, and its control is complicated and the cost is high

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