CN203428704U - Energy-saving elevator - Google Patents

Abstract

The utility model discloses an energy-saving elevator which comprises more than one motors used for driving the elevator to make lifting motion; the motors are connected with a three-phase input power grid by a frequency converter; the frequency converter comprises a rectifying unit and an invert unit; the rectifying unit is connected with the invert unit by a direct current (DC) bus; the DC bus is connected with an energy feedback unit used for feeding the regenerative energy on the DC bus back into the three-phase input power grid. According to the energy-saving elevator, the DC bus of the frequency converter is connected with the energy feedback unit used for feeding the regenerative energy on the DC bus back into the three-phase input power grid, so that the regenerative energy generated by the motors can be recycled under the condition of passive operation of the elevator, and the energy-saving effect is remarkable.

Description

Energy-saving lifter

Technical field

The utility model relates to elevator technology field, especially, relates to a kind of energy-saving lifter.

Background technology

Along with scientific and technological development, frequency conversion speed-adjusting is widely used.As building hoist field; starting current while starting due to building hoist is large; and in descending process, there is larger potential energy; during each shutdown, physical shock is large; frequency control is applied to after building hoist, and building hoist is controlled and is accelerated to gradually given speed by variable-frequency governor, operates steadily, physical shock is little; and the consumption of current of building hoist becomes large, non-impact current gradually by little.When building hoist is descending, utilize the potential energy drive motor operation of building hoist self, consumption of current is little.Therefore, the building hoist of variable frequency control is directly controlled electric motor driven elevator with common employing AC contactor and is compared, and energy-saving efficiency is more than 40%.

A general building hoist has two cages to move up and down with time delay standard knot, and both sides cage has two to overlap independently electrical controller, that is to say and in variable-frequency construction elevator, has two to overlap independently frequency-changing control system.At present, concerning low voltage frequency converter, its power circuit pattern is almost unified voltage-type, hand over--alternating current road directly--, be rectification---exchange and turn direct current circuit, filter circuit, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) principle that inverter circuit---direct current becomes alternating current circuit completes the speed governing of electrical motor, thereby drives variable-frequency construction elevator speed governing operation.In service at variable-frequency construction elevator, when building hoist is up, the outside horsepower output of frequency converter, when building hoist is descending, potential energy drive motor operation due to load-carrying in cage, cage, at this moment electrical motor is in generating state, after the flywheel diode rectification of electrical motor electricity amount by IGBT, be superimposed upon on the rectifying circuit of frequency converter, thereby cause that frequency changer direct current bus voltage raises, this part electric energy that when usually building hoist is descending traditionally, electrical motor is sent out is regenerated energy.If this part regenerated energy that electrical motor sends is not consumed, can causes the rising of frequency changer direct current bus side voltage, thereby affect the normal operation of frequency converter.

The processing mode of existing general frequency converter regenerated energy is resistance braking, with reference to Fig. 1, under the situation of elevator in passive operation, brake unit and the braking resistor of the electric energy that electrical motor produces through being connected with the DC bus of frequency converter adopts the mode of heat energy to be consumed.When regenerated energy causes that frequency changer direct current bus voltage is elevated to a certain value, brake unit is controlled regenerated energy and is consumed by braking resistor in heat energy mode.Therefore, the regenerated energy of frequency converter has just been wasted, and because braking resistor can produce amount of heat when consuming this part regenerated energy, has a strong impact on the running environment of building hoist and frequency converter.

Utility model content

The utility model object is to provide a kind of energy-saving lifter, to solve the existing elevator technical matters that regenerated energy cannot be recycled under passive operation situation.

For achieving the above object, the technical solution adopted in the utility model is as follows:

, comprising that one above for driving elevator to make the electrical motor of dipping and heaving, electrical motor is connected to three-phase input electrical network through frequency converter;

Frequency converter comprises rectification unit and inversion unit, and rectification unit is connected to inversion unit through DC bus;

On DC bus, be connected with for the energy feedback unit to three-phase input electrical network by Way of Regenerating Energy Feedback on DC bus.

Further, electrical motor is a plurality of, after the DC bus parallel connection of a plurality of frequency converters corresponding with a plurality of electrical motors, is jointly connected to energy feedback unit.

Further, energy feedback unit comprises voltage detection module, treater, driver module and inversion module;

Voltage detection module, exports treater to for detection of the vdc on DC bus and by the detection signal that detects vdc;

Treater, for controlling driver module work according to detection signal;

Inversion module, is connected with DC bus and three-phase input electrical network, for the regenerated energy on DC bus being reverse into alternating current according to the driving signal of driver module, exports three-phase input electrical network to.

Further, the inverter of inversion module for being formed by IGBT.

The utlity model has following beneficial effect:

The utility model energy-saving lifter, by being connected with on the DC bus of frequency converter for the energy feedback unit to three-phase input electrical network by the Way of Regenerating Energy Feedback on DC bus, thereby realized the recycling of the elevator regenerated energy that electrical motor produces under passive operation situation, energy-saving effect is remarkable.

Except object described above, feature and advantage, the utility model also has other object, feature and advantage.Below with reference to figure, the utility model is described in further detail.

Accompanying drawing explanation

The accompanying drawing that forms the application's a part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 is the structural representation of building hoist transducer control circuit in prior art;

Fig. 2 is the electrical structure schematic diagram of the utility model energy-saving lifter embodiment mono-;

Fig. 3 is the functional-block diagram of the utility model energy feedback unit; And

Fig. 4 is the electrical structure schematic diagram of the utility model energy-saving lifter embodiment bis-.

Description of reference numerals:

10, frequency converter; 11, rectification unit; 12, DC bus; 13, inversion unit;

20, electrical motor; 30, energy feedback unit; 31, voltage detection module;

32, treater; 33, driver module; 34, inversion module; 40, three-phase input electrical network.

The specific embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.

With reference to Fig. 2, preferred embodiment one of the present utility model provides a kind of energy-saving lifter, comprises for driving elevator to make the electrical motor 20 of dipping and heaving, and electrical motor 20 is connected to three-phase input electrical network 40 through frequency converter 10.Frequency converter 10 comprises rectification unit 11 and inversion unit 13, and rectification unit 11 is connected to inversion unit 13 through DC bus 12.Rectification unit 11 is connected to inversion unit 13 through DC bus 12, rectification unit 11 is changed direct current (DC) after three-phase input power rectifying and wave-filtering is processed and is exported DC bus 12 to, inversion unit 13 through the alternating current output that IGBT inversion is frequency, voltage is adjustable, moves the direct current (DC) on DC bus 12 with driving motor 20.On the DC bus 12 of frequency converter 10, be connected with for the energy feedback unit 30 to three-phase input electrical network 40 by Way of Regenerating Energy Feedback on DC bus 12.Because elevator is when descending, cage, potential energy drive motor 20 operations of load-carrying in cage, at this moment electrical motor 20 is in generating state, after the flywheel diode rectification of electrical motor 20 electricity amounts by IGBT, be superimposed upon on the rectification unit 11 of frequency converter 10, thereby DC bus 12 voltages that cause frequency converter 10 raise, the energy feedback unit 30 of the utility model through being connected with DC bus 12 inputted electrical network 40 by the Way of Regenerating Energy Feedback on DC bus 12 to three-phase, thereby showed the recycling of the elevator regenerated energy that electrical motor 20 produces under passive operation situation, energy-saving effect is remarkable., in traditional braking resistor resistance braking, also avoided braking resistor can produce the impact of amount of heat on frequency converter 10 running environment when consuming regenerated energy.

With reference to Fig. 3, in the present embodiment, energy feedback unit 30 comprises voltage detection module 31, treater 32, driver module 33 and inversion module 34.Wherein, voltage detection module 31, exports treater 32 to for detection of the vdc on DC bus 12 and by the detection signal that detects vdc; Treater 32, for controlling driver module 33 work according to detection signal; Inversion module 34, is connected with DC bus 12 and three-phase input electrical network 40, for the regenerated energy on DC bus 12 being reverse into alternating current according to the driving signal of driver module 33, exports three-phase input electrical network 40 to.

The principle of work of energy feedback unit 30 is as follows: when DC bus 12 sides form regenerated energy under the passive operation situation of elevator, vdc on DC bus 12 raises, the voltage that voltage detection module 31 detects DC bus 12 is elevated to after certain value, treater 32 is controlled driver module 33 and is driven inversion module 34 work, and inversion module 34 is reverse into alternating current by the regenerated energy on DC bus 12 and is fed back to three-phase input electrical network 40; Lower voltage on DC bus 12 is to certain value, and treater 32 is automatically controlled driver module 33 and stopped driving inversion module 34 work.In the present embodiment, the inverter of inversion module 34 for being formed by IGBT, IGBT inverter passes through to follow the tracks of the voltage waveform of three-phase input electrical network 40 three-phase input powers, inversion output and three-phase input electrical network 40 alternating current with frequency homophase; Treater 32 is dsp processor.

With reference to Fig. 4, in the utility model embodiment bis-, elevator comprises two cages that are positioned at standard knot both sides, correspondingly, each cage is all connected with one group of frequency converter 10 that drives 20, two groups of electrical motors 20 of its electrical motor of doing dipping and heaving to be connected respectively driving motor 20 actions.In the present embodiment, after DC bus 12 parallel connections of two frequency converters 10, be jointly connected to energy feedback unit 30.Energy feedback unit 30 in the present embodiment is identical with the energy feedback unit 30 of embodiment mono-.Embodiment bis-is with the difference of embodiment mono-: the DC bus 12 of two frequency converters 10 of driving motor 20 action is connected to energy feedback unit 30 after in parallel jointly respectively, with the regenerated energy that two frequency converters 10 are generated, is jointly fed back to three-phase input electrical network 40.Certainly, it will be understood by those skilled in the art that in the present embodiment that electrical motor 20 and frequency converter 10 can also be for more than two groups, more than two groups electrical motor 20 and frequency converter 10 share the recycling that energy feedback unit 30 is realized regenerated energy after in parallel.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (4)

1. an energy-saving lifter, is characterized in that, comprises that one above for driving elevator to make the electrical motor of dipping and heaving (20), and described electrical motor (20) is connected to three-phase input electrical network (40) through frequency converter (10);

Described frequency converter (10) comprises rectification unit (11) and inversion unit (13), and described rectification unit (11) is connected to described inversion unit (13) through DC bus (12);

On described DC bus (12), be connected with for the energy feedback unit (30) to described three-phase input electrical network (40) by the upper Way of Regenerating Energy Feedback of described DC bus (12).

2. energy-saving lifter according to claim 1, is characterized in that,

Described electrical motor (20) is a plurality of, after described DC bus (12) parallel connection of a plurality of described frequency converter (10) corresponding with a plurality of described electrical motors (20), is jointly connected to described energy feedback unit (30).

3. according to the energy-saving lifter described in claim 1 or 2, it is characterized in that,

Described energy feedback unit (30) comprises voltage detection module (31), treater (32), driver module (33) and inversion module (34);

Described voltage detection module (31), exports described treater (32) to for detection of the vdc on described DC bus (12) and by the detection signal that detects described vdc;

Described treater (32), for controlling described driver module (33) work according to described detection signal;

Described inversion module (34), be connected with described DC bus (12) and described three-phase input electrical network (40), for the regenerated energy on described DC bus (12) being reverse into alternating current according to the driving signal of described driver module (33), export described three-phase input electrical network (40) to.

4. energy-saving lifter according to claim 3, is characterized in that,

The inverter of inversion module (34) for being formed by IGBT.

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