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Lift Power System

A power supply system and lift technology, applied in the field of lift systems, can solve the problems of waste heat waste, inefficient use of power sources, waste of electricity, etc.

Inactive Publication Date: 2011-12-07
OTIS ELEVATOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to inefficient use of power sources
For example, during the hoist motor regeneration phase, if the negative power demand exceeds the storage capacity of the power system, a considerable amount of energy generated by each hoist motor may need to be wasted as waste heat
Not only is this a waste of electricity generated, it adds even more waste to the air conditioning requirements to prevent overheating from occurring

Method used

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Examples

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Embodiment Construction

[0007] figure 1 is a schematic diagram of a power system 10 comprising a common DC bus 11 for connection to a plurality of elevators 12a, 12b and 12c in a group elevator system according to an embodiment of the present invention. The elevator 12a includes an elevator cabin 14a, a cabin weight sensor 15a, a counterweight 16a, and a hoist motor 18a. Elevators 12b and 12c include like components labeled with like reference numerals. although figure 1 Three elevators 12a-12c are shown, but it should be understood that the power system 10 of the present invention may be adapted for use in an elevator system including any number of elevators.

[0008] The power system 10 includes a three-phase AC power source 20 , a power converter 22 , a voltage sensor 23 , a dynamic brake 24 , smoothing capacitors 25 a , 25 b and 25 c , power inverters 26 a , 26 b and 26 c , and a controller 31 . Power converter 22 and power inverters 26a - 26c are connected by common DC bus 11 . A dynamic bra...

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PUM

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Abstract

A power system (10) for operating a plurality of hoist motors (18a, 18b, 18c), each hoist motor controlling movement of one of a plurality of elevators (12a, 12b, 12c). The power supply system (10) includes a power bus (11) and a converter (22) connected across the power bus (11), and the converter (22) is used to convert AC power from an alternating current (AC) power supply (20) Converting to direct current (DC) power and delivering the DC power onto a power bus (11). The power system (10) also includes a plurality of inverters (26a, 26b, 26c) connected across the power bus (11). Each inverter (26a, 26b, 26c) is connected to a hoist motor (18a, 18b, 18c) and is operable to pass power from the power bus (11 ) DC power is converted into AC power to drive the hoisting motors (18a, 18b, 18c). Each inverter (26a, 26b, 26c) is also operable to convert the AC power produced by the hoist motor (18a, 18b, 18c) to DC power and deliver this DC power to the power bus (11 ). The controller (31) manages the power on the power bus (11) by controlling the operation of the converter (22) and inverters (26a, 26b, 26c), and utilizes the power delivered by the converter (22) and the generating hoist motor Power to the power bus (11) to drive the electric hoist motor.

Description

technical field [0001] The present invention relates to elevator systems. In particular, the invention relates to a power supply system for driving a plurality of elevator hoist motors. Background technique [0002] The power required to operate an elevator ranges from high positive values ​​(where externally generated power is utilized at a maximal rate) to negative values ​​(where the load in the elevator drives the motor so that it generates electricity like a generator). This use of the motor to generate electricity like a generator is often called regeneration. If friction loss, electrical conversion loss, and power used by ancillary equipment (such as lighting equipment) are not considered, assuming that in a building, all passengers who take the elevator up the stairs also take the same elevator down the stairs, then the average power required to operate the system to zero. However, since most elevators are dispatched based on efficiency, and power management consi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B1/30
CPCB66B1/308B66B1/302Y02B50/122
Inventor J·P·韦森M·S·汤普森
Owner OTIS ELEVATOR CO