CN87201142U

CN87201142U - Energy-saving controller for starting and braking of lift

Info

Publication number: CN87201142U
Application number: CN 87201142
Authority: CN
Inventors: 胡关祺
Original assignee: SHANGHAI CITY BUILDINGS INSTAL
Current assignee: SHANGHAI CITY BUILDINGS INSTAL
Priority date: 1987-03-17
Filing date: 1987-03-17
Publication date: 1988-11-02

Abstract

The utility model discloses an elevating mechanism dragged by an alternating-current induction motor, in particular to a passenger elevator which is a controlling device used for the starting and the braking, and is used in the electric dragging circuit of the elevating mechanism. The utility model is made up of a voltage regulating element and a switching element. The speed regulating control of the elevating mechanism in starting and braking are realized by making use of the impedance characteristic of the voltage regulating element and through regulating the operating current of a dragging motor. The utility model is characterized in that one or more reactors whose iron cores can be regulated are used as the voltage regulating elements in the elevating mechanism dragged by an alternating-current induction motor to replace the voltage regulating elements of the traditional resistor, the reactance resistor, etc. Compared with the existing similar controlling device, the elevating mechanism dragged by an alternating-current induction motor has the advantages of power saving, simple structure, and convenient maintenance.

Description

Energy-saving controller for starting and braking of lift

The utility model be the elevating gear that drags of AC induction motor especially the man lift start the energy-saving control setup of braking usefulness, belong to the elevating gear class.

Elevating gear, particularly man lift all require acceleration and deceleration steady in starting and glancing impact.In order to make the elevating gear that AC induction motor drags can smooth starting and gradual braking, need adopt starting, braking force control system in the circuit dragging of motor.Existing this pneumatic brake control device is general all to be constituted by access voltage regulation component and on-off element between the winding of power supply and dragging motor.During starting, this control setup utilizes resistance unit to carry out step-down.Glancing impact, by secondary or multilevel resistance---reactance step-down method produces regenerative brake.Utilize this device, can control starting and glancing impact rotating speed of motor, elevating gear can be started and brake reposefully by the voltage of regulating in the starting glancing impact input AC induction motor.Clearly, a large amount of resistance units and multilevel resistance reduction voltage circuit have been adopted in the pneumatic brake control device owing to rising at existing this elevating gear, so complex structure of this control setup, the maintenance trouble, and when each action, resistance unit all will consume certain energy, increases unnecessary energy consumption.

In view of above-mentioned the deficiencies in the prior art, but the purpose of this utility model is to propose a kind of elevating gear simple in structure and energy efficient to play pneumatic brake control device.

The utility model is achieved in that as everyone knows, the magnetic saturation characteristic of a reactor and the structure of this reactor, and particularly the size of this core of reactor a. g. is relevant.Be used as the reactor of voltage regulation component in existing pneumatic brake control device, the spacing of its iron core a. g. all is nonadjustable, in the process of starting braking elevating gear, the curve of magnetization of the used non-adjustable reactor of air gap substantially all is in saturation conditions, at this moment, pressure drop on the reactor is very little, relies on reactor itself to realize that actv. regulates to working current, so must rely on resistance unit to carry out the control that step-down realizes AC induction motor rotating speed that the motor drive hoist tool is used.The utility model proposes to rise in the pneumatic brake control device at existing elevating gear adopts the adjustable reactor of iron core a. g. as voltage regulation component, by regulating the spacing of core of reactor a. g., can make in elevating gear starting braking all processes, although the working current variation range of dragging motor is very big, but the magnetization characteristic of relevant reactor can both be in unsaturated state, utilize the induction reactance and the voltage for regeneration characteristic of reactor in the alternating current circuit this moment, need not adopt resistance unit, can reasonably regulate automatically the working current of elevating gear dragging motor, elevating gear can be started and brake reposefully.Owing to do not adopt resistance as voltage regulation component, therefore this later-model elevating gear plays pneumatic brake control device and has advantages such as simple in structure, easy to maintenance and energy efficient.

The utility model is described in further detail below in conjunction with accompanying drawing:

The scheme drawing of the control setup of the elevating gear starting braking usefulness that accompanying drawing 1 drags for existing AC induction motor.

The scheme drawing of the control setup of the elevating gear starting braking usefulness that accompanying drawing 2 drags for AC induction motor that the utility model proposed.

Among Fig. 11 is existing pneumatic brake control device, reactor 2A, 2B, 2C, 5A, 5B, 5C and resistance 3A, 3B, 3C, 5A, 5B, 5C are as voltage regulation component, contactless switch 4A, 4B, 4C and 6A, 6B, 6C have constituted control circuit as on-off element, wherein, one end and three phase mains A, B, the C of voltage regulation component join, and the other end then joins with the corresponding winding of dragging motor DT respectively.During starting, after connecting respectively, a part of winding of reactor 2A, 2B, 2C and resistance 3A, 3B, 3C insert the high speed winding of motor D T.This moment, motor D T was in the step-down status triggering, through certain delay time, and contactless switch 4A, 4B, 4C action, short circuit reactor 2A, 2B, 2C and resistance 3A, 3B, 3C make motor D T enter the mode of operation of NATURAL MECHANICAL PROPERTIES, until speed stabilizing.Glancing impact, a part of winding and resistance 6A, 6B, the 6C of reactor 5A, 5B, 5C connect respectively, insert the low speed winding of motor D T.This moment, motor D T was in regenerative power generation state owing to the inertia of rotor, through certain time-delay time, the successively winding of short circuit resistance 6A, 6B, 6C and reactor 5A, 5B, 5C.Until low speed, speed stabilizing.

Because in existing pneumatic brake control device 1, reactor 2A, 2B, 2C and 5A, 5B, 5C are nonadjustable, motor is being risen in the process of control of braking, reactor 2A, 2B, 2C and 5A, 5B, 5C all are in basically under the situation of saturation conditions and work, and therefore must adopt resistance unit 3A, 3B, 3C and 6A, 6B, 6C to carry out step-down.Clearly, owing to used a large amount of resistance units in the device 1, at each starting glancing impact, resistance unit 2A, 2B, 2C and 5A, 5B, 5C will expend certain electric energy.

Among Fig. 27 is the control setup that the utility model proposes.It is made of

voltage regulation component

8A, 8B, 8C, 10A, 10B, 10C and on-off element 9A, 9B, 9C, 11A, 11B, 11C.One end of voltage regulation component links to each other with three phase mains A, B, C, and the other end then directly links to each other with the winding of dragging motor DT respectively or links to each other with the winding of dragging motor DT with another voltage regulation component series connection back.On-off element then is in parallel with the mode of cross-over connection between power supply and dragging motor winding and corresponding voltage regulation component.

In order to overcome the little shortcoming of reactor unsaturation scope in existing the pneumatic brake control device, the utility model has adopted iron core a. g.

adjustable reactor

8A, 8B, 8C and 10A, 10B, 10C as voltage regulation component in control setup 7.Regulate a. g. of relevant core of reactor, make

reactor

8A, 8B, 8C and 10A, 10B, 10C be in best operating point, to guarantee that

reactor

8A, 8B, 8C and 10A, 10B, 10C can work basically in starting control of braking process under unsaturated state, current of electric can rationally be regulated automatically, thereby just can no longer need to rely on the resistance step-down.During starting, the high speed winding of motor D T is through the winding of reactor 8A, 8B, 8C; By three phase mains A, B, C power supply, at this moment, motor is in the step-down status triggering, and through certain delay time, with contactless switch 9A, 9B, 9C action that 8A, 8B, 8C are in parallel, the winding of short circuit reactor 8A, 8B, 8C is until speed stabilizing.Glancing impact,

reactor

8A, 8B, 8C and 10A, 10B, 10C are made voltage drop element, make motor D T be in the regenerative electric power braking state, through certain delay time, contactless switch 11A, 11B, 11C action, whole windings of

short circuit reactor

8A, 8B, 8C and 10A, 10B, 10C are until low-speed voltage stabilization.

The device 7 that the utility model proposed is compared with conventional device 1, can be found out significantly,, therefore install 7 and have simple in structurely, debug advantages such as easy to maintenance and economize on electricity because device does not adopt resistance as voltage drop element in 7.

In the specific implementation, iron core a. g.

REgulatable reactor

8A, 8B, 8C and 10A, 10B, 10C can be merged and form a reactance device, and adopt many tap structures.That is to say, can adopt many taps that air gap is adjustable reactor, come the whole reactance devices in the replacement device 7.

Be to confirm power savings, once on the man lift of 1 ton of 1 meter per second that drags with 11.2 kilowatts of AC induction motor, a utility model and a traditional pneumatic brake control device are compared test.Test results proves that every starting once adopts elevator of the present utility model to economize on electricity 0.01 kilowatt-hour than the elevator with orthodox method control.If start meter every day No. 1,000 time with every man lift, every is adopted elevator of the present utility model can economize on electricity 10 kilowatt-hours every day.Therefore the utlity model has certain economic benefits and social benefit.

Claims

The elevating gear that a kind of AC induction motor drags, especially man lift, the control setup of starting braking usefulness, be loaded in the Electric Traction circuit of elevating gear, constituted by voltage regulation component and on-off element, one end of its voltage regulation component is connected with power supply, the other end then directly is connected with the winding of dragging motor respectively or is connected with the winding of dragging motor with another one or a plurality of voltage regulation component back that is in series, on-off element then with the mode of cross-over connection between power supply and dragging motor winding and accordingly voltage regulation component be in parallel.It is characterized in that employed voltage regulation component is that a. g. of one or more iron cores is the reactors that can regulate in this device.