CN2768304Y - Motor swarm controlling and starting device - Google Patents
Motor swarm controlling and starting device Download PDFInfo
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- CN2768304Y CN2768304Y CN 200420107871 CN200420107871U CN2768304Y CN 2768304 Y CN2768304 Y CN 2768304Y CN 200420107871 CN200420107871 CN 200420107871 CN 200420107871 U CN200420107871 U CN 200420107871U CN 2768304 Y CN2768304 Y CN 2768304Y
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Abstract
The utility model discloses a controlling and starting device for a motor group, which comprises an electrical equipment system which is composed of N AC asynchronous motors, wherein each AC asynchronous motor is correspondingly provided with a starting device which is provided with a starting button and a starting circuit; a current transformer of the starting circuit is connected to the positive input end of an amplifier via a resistor; the negative input end of the amplifier is earthed via the resistor; the resistor is bridged between the positive input end and the output end of the amplifier; the output end of the amplifier is earthed via an adjustable resistor. The adjustable end of the adjustable resistor is connected with the positive input end of a subtracter; the negative input end of the subtracter is connected with a divider resistor which is preset with the maximum allowable current magnitude ip of a power supply system; the output end of the subtracter is connected with the positive input end of a comparator; the negative input end of the comparator is connected with the divider resistor which is used as the maximum starting current magnitude ii of corresponding equipment; the output end of the comparator is connected with a triode via an intermediate relay; a collecting electrode is connected with a time relay and a load relay which are connected in parallel.
Description
Technical field
The utility model relates to electric automatization, particularly the control starting drive of motor group.
Background technology
A large amount of use AC asynchronous motor because the starting current of asynchronous machine is several times as much as its operating current, thereby can impact to electrical network in electric equipment system.In some enterprise, a large amount of such equipment are arranged under the electric power system, comprise many in skinny devices, and these equipment use at random, start frequent.If the equipment of Qi Donging is more simultaneously, its rush of current might exceed the electric power system power supply capacity, even causes the system protection tripping operation, thereby destroys the operate as normal of miscellaneous equipment.
In order to solve the electric motor starting current impact, at present mature technique is a soft Starting Technology.The soft Starting Technology scheme is more, and its total thinking is to come limiting starting current by the variation of control starting resistor or the variation of controlling torque.The most frequently used soft Starting Technology scheme has at present: current-limited startup, ramp voltage start, torque control starts, torque adds the kick startup and voltage control starts.Present state-of-the-art electronics soft initiator all adopts single-chip microcomputer to realize intelligent control.The higher electronics soft initiator of intelligent degree has good startability, stopping performance and defencive function.As Chinese utility model patent ZL99127241.2 " a kind of soft starter for motor device of dust catcher ", it comprises first start-up circuit, second start-up circuit, motor circuit, logic control circuit.Elder generation is by the first start-up circuit work during electric motor starting, motor is quickened to the slow-speed of revolution of setting from zero rotating speed earlier, after the time-delay, motor speed reaches the slow-speed of revolution of described setting substantially, first start-up circuit is switched, and second start-up circuit comes into operation, and the rotating speed of the described motor of gained when operate as normal quickens, because electric motor starting is divided into two-stage and progressively quickens, the starting current when therefore starting is little.But soft Starting Technology also has following weak point: the one, and the cost height.In general the soft start scheme all needs more powerful controllable devices, has improved installation cost, therefore is used for relatively large equipment more; The 2nd, versatility is poor.Dissimilar soft initiators is to the load request difference, and underloading and heavily loaded situation can not be general.So the soft initiator versatility is relatively poor.The 3rd, prolong start-up time.Soft start reduces detent torque, has prolonged the start-up time of motor.This shows,, can not use soft starting device to come limiting starting current in a large number for said that class enterprise in front.
Summary of the invention
Technical problem to be solved in the utility model is at above-mentioned deficiency, and provide the control starting drive of motor group, this device can be judged the present situation of electric power system automatically when starting a plurality of equipment, only under meeting the situation of entry condition, just start the motor in this equipment, to guarantee electric power system safety.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: the control starting drive of motor group, comprise the electric equipment system that N AC asynchronous motor formed, starting drive of the corresponding configuration of each AC asynchronous motor with a start button, the technical measures of taking comprise:
Starting drive contains the start-up circuit of being made up of current transformer, resistance, operational amplifier, triode, relay, current transformer warp-resistance in this start-up circuit inserts the positive input terminal of amplifier, the negative input end of amplifier is then through a grounding through resistance, the positive input terminal of amplifier and output span are connected to a resistance, and the output of amplifier is through an adjustable resistance ground connection, the adjustable end of adjustable resistance connects the subtracter positive input terminal, and the negative input end of subtracter is connected with divider resistance as presetting electric power system maximum permissible current value ip; The subtracter output connects the comparator positive input terminal, the negative input end of comparator is connected with the maximum starting current value ii of divider resistance as relevant device, comparator output terminal is connected to triode through auxiliary relay, this transistor emitter ground connection, collector electrode is connected to time relay JT and the load-relay that is in parallel, and another contact between the time relay and the load-relay connects power supply.
For optimizing technique scheme, the measure of being taked also comprises:
The normally-closed contact that the above-mentioned time relay has a time-delay to disconnect, auxiliary relay has the normally opened contact and the normally opened contact that is used to control holding circuit that are used to control executive circuit, load-relay has a normally opened contact, and two contacts of start button correspondence connect the normally opened contact of auxiliary relay and the normally-closed contact of the time relay respectively.
For simulating the action of former start button, the normally opened contact of above-mentioned load-relay JL is connected to two end points at the former start button of working equipment place, and cooperates with the time relay.
Compared with prior art, the utility model starting drive contains the start-up circuit of being made up of current transformer, resistance, operational amplifier, triode, relay, and with operational amplifier respectively as amplifier, subtracter, comparator utilization, circuit is simple and practical, this device does not need high power device owing to do not relate to the working equipment main circuit, and circuit is simple, the working equipment repacking is convenient, so cost is low; In addition, the device technique principle does not change the start-up course of motor, so highly versatile, and the control that is specially adapted to many medium and small device clusters starts.
Description of drawings
Fig. 1 is the utility model circuit theory schematic diagram;
Fig. 2 is the utility model application system schematic diagram.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Structure of the present utility model is seen shown in the accompanying drawing 1,2.
The control starting drive of motor group, comprise the electric equipment system that N AC asynchronous motor formed, starting drive of the corresponding configuration of each AC asynchronous motor with a start button, starting drive contains by current transformer, resistance, operational amplifier, triode, the start-up circuit that relay is formed, insert the positive input terminal of amplifier through a resistance as the current transformer LT in this start-up circuit among Fig. 1, the negative input end of amplifier is then through a grounding through resistance, the positive input terminal of amplifier and output span are connected to a resistance, and the output of amplifier is through an adjustable resistance ground connection, the adjustable end of adjustable resistance connects the subtracter positive input terminal, and the negative input end of subtracter is connected with divider resistance as presetting electric power system maximum permissible current value ip; The subtracter output connects the comparator positive input terminal, the negative input end of comparator is connected with the maximum starting current value ii of divider resistance as relevant device, comparator output terminal is connected to triode through auxiliary relay JZ, this transistor emitter ground connection, collector electrode is connected to time relay JT and the load-relay JL that is in parallel, and another contact between time relay JT and the load-relay JL connects power supply.
Three relays are arranged: wherein among Fig. 1, the normally-closed contact JTb that time relay JT has a time-delay to disconnect, auxiliary relay JZ has the normally opened contact JZk and the normally opened contact JZk1 who is used to control holding circuit that are used to control executive circuit, load-relay JL has a normally opened contact JLk, two contacts of start button correspondence connect the normally opened contact JZk1 of auxiliary relay JZ and the normally-closed contact JT of time relay JT respectively, and load-relay JL cooperates the action of simulating former start button with the time relay; And former start button QA reconfiguration shows the place in Fig. 1.
The signal of device application system as shown in Figure 2; Starting drive of every equipment disposition, as ST-1, ST-2 among Fig. 2 ... ST-n.With original equipment start button Q1, Q2 ... the Qn reconfiguration is in shown position.Starting drive presets the maximum starting current value ii information of electric power system maximum permissible current value ip and relevant device, and obtains the information of electric power system actual current value i from current transformer LT.During with the start button starting device,,, then start this equipment immediately when the value of electric power system residual current i0=ip-i is not less than the maximum starting current ii of this equipment by the judgement of this device; If the residual current deficiency, then explanation is just having miscellaneous equipment to be among the start-up course now, and this equipment is just temporary transient to be waited for, starts until miscellaneous equipment to finish, and residual current meets the requirements and restarts this equipment.By this method, make numerous equipment accomplish orderly start, avoid multiple devices to start simultaneously and clash, guarantee the safety of electric power system.
The signal of starting drive circuit theory as shown in Figure 1.
Obtain the current actual current information of electric power system by current transformer, after amplifying dividing potential drop, subtract each other with the electric power system maximum permissible current, obtain electric power system current residual current i 0 value, should be worth with the maximum starting current ii of this equipment value and compare, comparator output ic was a low level when residual current was not enough, when residual current was enough, then ic was a high level.
The course of work: during starting device, start button QA action, auxiliary relay JZ gets electric, the closed self-insurance of the normally opened contact JZk1 of its control holding circuit, the normally opened contact JZk closure of its control executive circuit is connected control circuit and executive circuit simultaneously; If comparator output ic is a low level, then triode ends, and load-relay JL and time relay JT all do not work, and equipment wouldn't start; If comparator output ic is a high level, illustrate that the electric power system residual current is enough, the triode saturation conduction, load-relay JL and time relay JT get electric, the normally opened contact JZk closure of control executive circuit, device start, the normally-closed contact JTb time-delay that the time-delay of time relay JT simultaneously disconnects disconnects, auxiliary relay JZ dead electricity, and triode recovers to end, the normally opened contact JZk of auxiliary relay JZ disconnects again, has simulated the action of the former start button of equipment.
This programme is existing to be realized with analog circuit, and its control section can substitute with single-chip microcomputer.
Claims (3)
1, the control starting drive of motor group comprises the electric equipment system that N AC asynchronous motor formed, and starting drive with a start button of the corresponding configuration of each AC asynchronous motor is characterized in that:
Described starting drive contains by current transformer, resistance, operational amplifier, triode, the start-up circuit that relay is formed, current transformer in this start-up circuit (LT) inserts the positive input terminal of amplifier (FD) through a resistance, the negative input end of amplifier (FD) is then through a grounding through resistance, the positive input terminal and the output span of amplifier (FD) are connected to a resistance, and the output of amplifier (FD) is through an adjustable resistance ground connection, the adjustable end of adjustable resistance connects subtracter (JF) positive input terminal, and the negative input end of subtracter (JF) is connected with divider resistance as presetting electric power system maximum permissible current value ip; Subtracter (JF) output connects comparator (BJ) positive input terminal, the negative input end of comparator (BJ) is connected with the maximum starting current value ii of divider resistance as relevant device, comparator (BJ) output is connected to triode through auxiliary relay (JZ), this transistor emitter ground connection, collector electrode is connected to the time relay (JT) and the load-relay (JL) that is in parallel, and another contact between the time relay (JT) and the load-relay (JL) connects power supply.
2, the control starting drive of motor group according to claim 1, it is characterized in that: the normally-closed contact (JTb) that the described time relay (JT) has a time-delay to disconnect, auxiliary relay (JZ) has one and is used to control the normally opened contact (JZk) of executive circuit and the normally opened contact (JZk1) that is used to control holding circuit, load-relay (JL) has a normally opened contact (JLk), and two contacts of start button correspondence connect the normally opened contact (JZk1) of auxiliary relay (JZ) and the normally-closed contact (JTb) of the time relay (JT) respectively.
3, the control starting drive of motor group according to claim 2 is characterized in that: the normally opened contact (JLk) of described load-relay (JL) is connected to two end points at the former start button of working equipment place, and cooperates with the time relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420107871 CN2768304Y (en) | 2004-10-28 | 2004-10-28 | Motor swarm controlling and starting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420107871 CN2768304Y (en) | 2004-10-28 | 2004-10-28 | Motor swarm controlling and starting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2768304Y true CN2768304Y (en) | 2006-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420107871 Expired - Fee Related CN2768304Y (en) | 2004-10-28 | 2004-10-28 | Motor swarm controlling and starting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2768304Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610057B (en) * | 2009-07-03 | 2012-05-23 | 南通冷冻设备有限公司 | Three-motor common-drive spiral tower system of spiral freezer |
| CN105204384A (en) * | 2015-09-23 | 2015-12-30 | 安徽三星化工有限责任公司 | Motor group operation monitoring method |
| CN105262203A (en) * | 2015-10-27 | 2016-01-20 | 深圳市信维通信股份有限公司 | Power supply management method and system |
-
2004
- 2004-10-28 CN CN 200420107871 patent/CN2768304Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610057B (en) * | 2009-07-03 | 2012-05-23 | 南通冷冻设备有限公司 | Three-motor common-drive spiral tower system of spiral freezer |
| CN105204384A (en) * | 2015-09-23 | 2015-12-30 | 安徽三星化工有限责任公司 | Motor group operation monitoring method |
| CN105262203A (en) * | 2015-10-27 | 2016-01-20 | 深圳市信维通信股份有限公司 | Power supply management method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Designer after: Chen Gang Designer after: Chen Weibang Designer after: Yuan Qiang Designer after: Yu Yexun Designer before: Chen Weibang Designer before: Yuan Qiang Designer before: Yu Yexun |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: DESIGNER; FROM: CHEN WEIBANG; YUAN QIANG; YU YEXUN TO: CHEN GANG; CHEN WEIBANG; YUAN QIANG; YU YEXUN |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |