CN206461544U - Full-automatic AC electric motor electricity-saving device - Google Patents

Abstract

The utility model discloses a kind of full-automatic AC electric motor electricity-saving device, mainly it is made up of main circuit and control circuit, its main circuit mainly includes：Bypass/energy-conservation change-over switch, sub-connecting switch of transformer and multi-tap transformer, it is characterised in that：Bypass/energy-conservation change-over switch has two, it is separately mounted to the primary side input side and secondary outlet side of transformer, shunting switch is connected with each tap of transformer respectively, and the action of shunting switch is controlled by control circuit output signal, and the signal transmission between control circuit and main circuit is connected by signal wire.The utility model is by gathering the power factor in electric motor operation come real-time regulation motor supply voltage.Voltage-regulation uses auto-transformer multi-tap form, ac motor actual power factor is compared with the multiple reference values set, the corresponding tap of comparative result control gating transformer, change the transformation ratio of transformer, change the output voltage of transformer, the actual power demand for making it meet load.

Description

Full-automatic AC electric motor electricity-saving device

Technical field

The utility model is related to a kind of electric motor electricity-saving device, more particularly to a kind of full-automatic AC motor electricity saving dress The energy-saving technical scheme put, belongs to power-saving technology and electronic circuit design field.

Background technology

Economy Development, electric power is leading.In recent years, developing rapidly with China's economy, many developed areas go out Show the electric power nervous situation that supply falls short of demand, this directly constrains these regional economic developments, also, in face of non-renewable Primary energy, such as coal, oil, the exhaustion of natural gas resource, we will more be directed to the energy saving research of electrical equipment.And motor It is a kind of highly energy-consuming power-equipment of application amount greatly, using scope extensively again, is counted according to related data, China's motor power consumption The 60%~70% of commercial power total amount is accounted for, this is mainly due in practical application, and many motor are too greatly considered Safe clearance, makes it be chronically at light running state so that the operating efficiency of motor is very low, so causes serious Energy waste.Therefore, to motor carry out Energy Saving Control, the operating efficiency of lifting motor, save electricity for the energy increasingly Rare today's society has very important practical significance, is also very urgent crucial behave.

It is well known that the operational efficiency of motor is relevant with load, when motor is run near nominal load, Efficiency and power factor are all very high, but when load factor is relatively low, its power factor and efficiency all drastically decline, and according to exchange Asynchronous motor working characteristics, operational efficiency highest of its power factor 0.8 or so, and running speed is by the size shadow of voltage Ring little, thus the utility model uses the control mode of pressure regulating energy-saving, i.e., joined by the electricity gathered in motor running Amount, obtains power factor actual value, is then compared with setting value, and the tap of comparative result control multi-tap transformer is opened Close, change the output voltage values of transformer, the supply voltage of motor is followed the change of load and is changed, so just can be reasonable Realize the purpose of pressure regulating energy-saving.

Utility model content

The utility model be for solve motor practical application in operational efficiency it is very low, the problem of power consumption is very big And invent design.Full-automatic AC electric motor electricity-saving device is main to be made up of main circuit and control circuit.Wherein main circuit bag Include：Bypass/energy-conservation change-over switch, sub-connecting switch of transformer (electric switch or electronic switch), transformer etc.；Control circuit bag Include：Electric parameter of electric motor Acquisition Circuit, power factor obtain circuit, window comparator circuit, switch driving circuit, zero passage detection and Failure detector circuit etc..

The bypass start-up and section of battery saving arrangement can be achieved by the orderly switching of three switches in the utility model main circuit The bumpless transfer that can be run；High voltage side of transformer is designed using multi-tap, and the selection of each transformation ratio is by dividing for being connected with tap Switch control is connect, and the control signal of shunting switch comes from control circuit.

Voltage, the collection of current signal in utility model control circuit realiration motor running, actual power factor Calculate, the comparison of power factor actual value and setting value, comparative result passes through associated driver circuitry driving transformer shunting switch, Realize and real-time pressure regulating energy-saving is changed according to load, zero cross detection circuit makes sub-connecting switch of transformer be acted in zero crossing, it is ensured that open The security reliability of pass action, reduction even avoids the impact of overvoltage from endangering.Failure detector circuit real-time inspection and control signal, Bypass power supply can be automatically switched to when exception occurs for control signal or switch motion, prevents incorrect switching from causing the event such as short circuit Barrier, while being also convenient for timely, the security maintenance of battery saving arrangement under conditions of not influenceing to load normally operation.

The beneficial effects of the utility model：

1. motor can be made to realize the seamless switching that bypass mains-supplied operation is run with pressure regulating energy-saving；

2. being changed according to load, the multistage for realizing motor supply voltage using auto-transformer multi-tap form is effectively adjusted Section, so as to improve the operational efficiency of motor, greatlys save electric energy；

3. main circuit, which bypasses/saved change-over switch and sub-connecting switch of transformer, has multiple choices, the work longevity can select Life length, the electric switch or small volume, reaction speed of the high reliability such as contactor, relay for being swift in motion are fast The contactless electronic beam switch such as controllable silicon, IGBT, Darlington transistor；

4. transformer multi-tap is designed, each voltage gear for exporting transformer is relative with each power factor setting value Should；

5. switch motion is had more safety and stability using zero cross detection circuit；

6. using failure detector circuit ensure that bypass power supply can be switched to during battery saving arrangement failure in time, without influenceing load Safe operation, while can also facilitate maintenance personal's quick lock in trouble point, carry out working service.

Brief description of the drawings

Fig. 1 is the main circuit schematic diagram of full-automatic AC electric motor electricity-saving device.

Wherein：KM1, KM2, KM3 are bypass/energy-conservation change-over switch；C1, C2 are multi-tap transformer；K11、K12、K13、 K14 is transformer C1 shunting switch；K21, K22, K23, K24 are transformer C2 shunting switch.

Fig. 2 is the theory diagram of power factor comparison circuit.

Wherein：1- logic circuits；2- drive circuits；3- sub-connecting switch of transformer.

Fig. 3 is silicon control zero-cross triggers circuit schematic diagram.

Wherein：T11, T12 are controllable silicon both end voltage signal；QD1 is transformer gear selection signal；G11, G12 are can Control silicon control pole signal；Q1 is NPN type triode；Uxx is integrated circuit；Cxx is electric capacity；Rxx is resistance.

Embodiment

Below accompanying drawing will be coordinated to elaborate the utility model.The present embodiment using technical solutions of the utility model as Under the premise of implemented, provide detailed embodiment, but protection domain of the present utility model is not limited to following embodiments.

The utility model is to be chronically at asking for the electric energy serious waste that underloading or Light Condition are caused to solve motor Inscribe and invent design.By gathering the electric parameter of motor operation, actual power factor is obtained, power factor can reflect negative conscientiously The situation of change of load, then by power factor actual value and setting value comparison, output comparative result control transformer point Switch motion is connect, suitable motor voltage gear is selected, motor voltage follow is loaded real-time change, all the time In energy-efficient running status.

The utility model is main to be made up of main circuit and control circuit.Main circuit part mainly includes bypass/energy-conservation conversion Switch, sub-connecting switch of transformer (electric switch or electronic switch) and transformer etc., as shown in Figure 1.KM1, KM2, KM3 are in figure Bypass and energy-conservation switching switch, rationally control its switching sequence to ensure that handoff procedure does not influence the normal operation of motor. In bypass operation, KM2 closures, KM1 and KM3 disconnect；Bypass is when switching to energy-saving run, i.e., when battery saving arrangement starts, switch it is dynamic Work order be：KM3 closures, KM2 disconnect, KM1 closures；When energy-conservation is switched to bypass operation：KM1 disconnects, KM2 closures, KM3 break Open.Transformer C1, C2 primary side are multi-tap form, and K11~K14, K21~K24 are sub-connecting switch of transformer, switch control letter Number come from control circuit, and the long conducting of B phases in three-phase electricity.

Control circuit includes：Electric parameter Acquisition Circuit, power factor are obtained and change-over circuit, comparison circuit and drive circuit Deng.The electric parameter Acquisition Circuit is to gather the voltage and current signal in electric motor operation；Power factor is obtained by counting Circuit, logic gates, storage circuit and D/A change-over circuits are realized；Comparison circuit is power factor actual value and setting value Compare, as shown in Fig. 2 comparative result passes through logic circuit 1 and drive circuit 2, obtain the control signal of sub-connecting switch of transformer, Sub-connecting switch of transformer 3 can select a variety of switches, such as relay, contactor, IGBT, Darlington transistor, controllable silicon.

It is different according to the shunting switch of selection in practical application, different drivings or triggers circuit should be used.Focus on below Introduce thyristor gating circuit.Controllable silicon (can select bidirectional triode thyristor or by one-way SCR reverse parallel connection, this, which is sentenced, unidirectionally may be used Exemplified by control silicon.) be a kind of large power semiconductor device, with small volume, fast, contactless reaction speed, no-spark, it is noiseless, High efficiency, the switch advantage such as low cost.It is illustrated in figure 3 the circuit theory diagrams of silicon control zero-cross triggering.Reverse-blocking tetrode thyristor characteristic： When controllable silicon anode potential be higher than cathode potential, and control pole added with positive trigger pulse when, controlled silicon conducting；When controllable silicon is cloudy When electrode potential is less than maintenance electric current higher than anode potential or anode current, controllable silicon shut-off.T11, T12 are controllable silicon two in Fig. 3 Terminal voltage signal, G11, G12 are the control pole signal of two inverse parallel one-way SCRs, and U1, U2 constitute voltage follower circuit, U3 is Zero-cross comparator circuit, and QD1 is transformer tapping gating signal, and U6 is trigger, and U7, U8, U9 are optocoupler, and the circuit is reality It is existing, when at voltage over zero and when QD1 is high level, SCR control pole just has positive trigger signal, turns it on.Such as This just can make the battery saving arrangement realize that dynamic response time is short, quick and the change of safe follow load, it is to avoid non-zero crossing occur Switch the phenomenon that powerful interference will be caused to power network and enormous impact is caused to loading.

It is last it should be noted that：Embodiment of the present utility model is above are only, is implemented to of the present utility model Mode is defined, every utilization the utility model specification and accompanying drawing content, and the utility model is applied into other related skills Art field, it all should cover among protection domain of the present utility model.

Claims (4)

1. a kind of full-automatic AC electric motor electricity-saving device, is mainly made up of, its main circuit is mainly wrapped main circuit and control circuit Include：Bypass/energy-conservation change-over switch, sub-connecting switch of transformer and multi-tap transformer, it is characterised in that：Bypass/energy-conservation conversion is opened Pass has two, is separately mounted to the primary side input side and secondary outlet side of transformer, shunting switch respectively with each tap of transformer Connect, and the action of shunting switch is controlled by control circuit output signal, the signal between control circuit and main circuit is transmitted Connected by signal wire.

2. a kind of full-automatic AC electric motor electricity-saving device according to claim 1, it is characterised in that：The transformer is Auto-transformer multi-tap form, i.e., according to the multiple voltage gears of electric motor operation characteristic point.

3. a kind of full-automatic AC electric motor electricity-saving device according to claim 1, it is characterised in that：The transformer point Switch is connect to be arranged in each tap of transformer primary side.

4. a kind of full-automatic AC electric motor electricity-saving device according to claim 1, it is characterised in that：Bypass/the section Energy change-over switch and sub-connecting switch of transformer have multiple choices, can select mechanical switch or electronic non-contact Switch.