CN2356444Y

CN2356444Y - Motor protector with delay automatic starter

Info

Publication number: CN2356444Y
Application number: CN 98247561
Authority: CN
Inventors: 郭长信
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-12-02
Filing date: 1998-12-02
Publication date: 1999-12-29
Anticipated expiration: 2008-12-02

Abstract

The utility model relates to a motor protector with a delay automatic starter, comprising a motor phase interruption and overload protection circuit, a delay self-starting circuit and wire connecting terminals 1, 2, 3 and 4. The utility model is characterized in that the power supply of the protection circuit for electric motor adopts a main circuit transformer secondary coil; the protection circuit adopts a relay N. O. contact; a trigger circuit composed of a thyristor, a triode, etc. is connected with a delaying self-starting circuit composed of an NE555. The utility model has the advantages of reducible energy consumption, safe operation, simple circuit, low cost, etc. The utility model is suitable for oil field pumping units during local power grid blackout; when the power is restored, the motor is capable of self-starting and motor protection.

Description

The motor protector that has the self-starting device of delaying time

The utility model relates to a kind of motor protector, particularly a kind of motor protector that has the self-starting device of delaying time.

At existing motor protector,, have the time-delay self-starting device and the phase failure, overload protection function as Chinese patent application numbers 93204804.8.When electrical network incoming call or have a power failure when sending a telegram here once again; motor is started voluntarily; when motor rotation or power not normal; can protect, but in use because time-delay self-starting device long-term in running order consumed power, in addition; protective circuit is to adopt the relay normally-closed contact;, can not in time find again once itself whip bad or the non-transformer situation just can not be protected in use, the time motor of burning generation arranged.

The purpose of this utility model is to provide a kind of motor protector that has the self-starting device of delaying time.

The utility model is achieved in that the motor protector that has the self-starting device of delaying time; comprise the motor phase failure, overload protecting circuit, time-delay self-start circuit and binding post 1,2,3,4, be characterized in: the secondary coil L of motor M main circuit instrument transformer ₄, L ₅, L ₆End after the series connection and diode VD ₃Negative pole be connected, the secondary coil other end is connected with the positive source of protective circuit.The normally opened contact of the protection relay J of motor protecting circuit is connected with binding post 2,3.The resistance R that connects the monostable circuit output of relay coil SJ and time-delay ₁With controllable silicon VD ₂The control utmost point be connected controllable silicon VD ₂Negative pole be connected controllable silicon VD with the other end of relay coil SJ ₂Positive pole pass through R ₂, R ₃Respectively with 4,8 pin and the triode VT of NE555 ₁Base stage be connected triode VT ₁Emitter also be connected triode VT with 4,8 pin of NE555 ₁Collector electrode pass through resistance R ₄Be connected with 2,6 pin of NE555.Normally opened contact as the time-delay relay SJ of motor time-delay self-start circuit is connected with binding post 2,4.The power transformer B of time-delay self-start circuit ₁Once survey, connect binding post 1,4 by K switch.The power supply that is motor protecting circuit adopts main circuit instrument transformer secondary coil; protective circuit adopts the normally opened contact of relay; work as motor operation like this or power not normal; and protector itself is when damaging; relay normally open contact J recovers often to open; can not move and close, make the work of protector more safe and reliable.The time-delay self-start circuit is to be connected with the monostable time delay circuit that NE555 constitutes by the circuits for triggering that controllable silicon, triode etc. constitutes, and promptly works as the 3 pin output high level of NE555, during the adhesive of relay SJ normally opened contact, because controllable silicon VD ₂Control very positive potential, make controllable silicon VD ₂Conducting also makes triode VT simultaneously ₁At this moment also conducting, makes charging capacitor C two ends by triode VT ₁Emitter, collector electrode, resistance R ₄Constitute the loop, make the capacitor C discharge because charging resistor R ₅Minimum resistance is greater than discharge resistance R ₄1/2 times of maximum value, so discharge electricity amount greater than charge volume, no longer raises so charging capacitor C both end voltage can drop to zero, 6,2 pin of NE555 are high potential, 3 pin output low levels, the normally opened contact of relay SJ resets, at this moment controllable silicon VD ₂, triode VT ₁Charging capacitor C both end voltage should keep conducting state, so can not raise again.That is to say after time-delay self-starting relay SJ action, make the charging capacitor discharge, self-starting relay SJ is automatically reset, be in non operating state by circuits for triggering.

The utility model has the following advantages compared with the prior art:

1, because time-delay self-starting relay SJ of the present utility model, be release condition when rigidly connecting energize, moving after a while closing is as the moving 7-10 just can restPose automatically after second (being motionless closing) that closes, the power transformer secondary load is not worked, so have the few characteristics of power consumption.

2, because protective circuit of the present utility model adopts the normally opened contact of relay, motor is a closure state when normal operation, when motor operation or power supply and protector itself are not normal, can in time find, can not use under the malfunctioning situation of protector.

3, because the power supply of protective circuit of the present utility model adopts the induced current of motor load electric current by the secondary coil of utilization instrument transformer, as the working power of protective circuit, this is than safer reliable by independent power transformer power supply.

4, the utility model has also that circuit is simple, cost is low and be convenient to advantages such as tissue production, is applicable to that the oil-field oil pumper automatic time delay opens to take out and motor protection.

The utility model is provided by the following drawings and embodiment.

Fig. 1 has the electrical schematic diagram of the motor protector of self-starting device for the utility model.

Fig. 2 is a use winding diagram of the present utility model.

Embodiment of the present utility model is as follows: as Fig. 2: the power supply of actuating motor circuit, can distinguish " manually " or " automatically ".

In the time of manually, power supply B, C are by stop button TA, starting button QA line-start motor M.

Automatically the time, power supply B, C are by binding post 1,4, K switch, the monostable time delay circuit supply that transformer B1 constitutes to NE555, when rigidly connecting energize, the charging capacitor C both end voltage of monostable time delay circuit is very low, 6,2 pin of NE555 are high potential, so 3 pin output electronegative potential, the relay SJ that is connected with 3 pin of NE555 is failure to actuate respectively, and motor M can not start.Pass through resistance R ₁With controllable silicon VD ₂The controllable silicon VD that the control utmost point is connected ₂Can not trigger, be in off state, by controllable silicon VD ₂Positive pole, resistance R ₃With triode VT ₁The triode VT that base stage is connected ₁Can not conducting.After a while, power cathode passes through resistance R ₅, the capacitor C both end voltage that is connected with 6,2 pin of NE555 of RW raises, 6,2 pin of NE555 are electronegative potential, so 3 pin output high potential makes relay SJ open that normal contact is moving closes, binding post 2,4 is connected the power supply of ac contactor coil JC, motor M startup.At this moment, motor main circuit instrument transformer secondary coil L ₄, L ₅, L ₆Induced current through diode VD ₃Give by two after the rectification, components and parts such as triode constitute, with door (open phase protection) circuit and logic switch time-delay (overload protection), the road power supply; when motor M normally moves; protection relay J action, protective circuit normally opened contact J adhesive, binding post 2,3 is connected.At this moment the controllable silicon VD that is connected with NE555 monostable time delay circuit ₂Triode VT ₁All be in conducting state, make charging capacitor C two ends by triode VT ₁Emitter, collector electrode, resistance R ₄The discharge circuit that is connected to form with 6,2 pin and the charging capacitor C of NE555.Because charging resistor R ₅Resistance is greater than discharge resistance R ₄1/2 times of resistance so charging capacitor C both end voltage can reduce gradually, waits to drop to when very low, and 6,2 pin of NE555 recover high potential, so 3 pin recover electronegative potential, and relay SJ normally opened contact, binding post 2,4 recovery disjunction state, at this moment controllable silicon VD ₂, triode VT ₁Keep conducting state, charging capacitor C both end voltage no longer raises, thereby makes time-delay self-starting relay SJ work the several seconds with regard to recovering non operating state automatically after energized, has reached energy-conservation purpose.Motor protector is powered without power transformer, improved the reliability of motor protector.

Claims

1, a kind of motor protector that has the automatic starting gear of delaying time comprises motor protecting circuit, time-delay self-start circuit and binding post 1,2,3,4, it is characterized in that it also comprises:

The secondary coil L of a, motor M main circuit instrument transformer ₄, L ₅, L ₆End after the series connection and diode VD ₃Negative pole be connected, the secondary coil other end is connected with the positive source of protective circuit;

The normally opened contact of the protection relay J of b, motor protecting circuit is connected with binding post 2,3;

The resistance R of the monostable circuit output of c, connection relay coil SJ and time-delay ₁With controllable silicon VD ₂The control utmost point be connected controllable silicon VD ₂Negative pole be connected controllable silicon VD with the other end of relay coil SJ ₂Positive pole pass through R ₂, R ₃Respectively with 4,8 pin and the triode VT of NE555 ₁Base stage be connected triode VT ₁Emitter also be connected triode VT with 4,8 pin of NE555 ₁Collector electrode pass through resistance R ₄Be connected with 2,6 pin of NE555;

D, be connected with binding post 2,4 as the normally opened contact of the time-delay relay SJ of motor time-delay self-start circuit;

The power transformer B of e, time-delay self-start circuit ₁Primary side, connect binding post 1,4 by K switch.