CN201708746U

CN201708746U - Motor reduced-voltage starter

Info

Publication number: CN201708746U
Application number: CN2010201740833U
Authority: CN
Inventors: 梁涛
Original assignee: Sinohydro Bureau 5 Co Ltd
Current assignee: Sinohydro Bureau 5 Co Ltd
Priority date: 2010-04-27
Filing date: 2010-04-27
Publication date: 2011-01-12
Anticipated expiration: 2020-04-27

Abstract

The utility model discloses a motor reduced-voltage starter comprising a main circuit and a reduced-voltage starting control circuit, wherein the reduced-voltage starting control circuit consists of a starting button S1, master controllers Q2a and Q2b, alternating current contactors KM1-KM3, intermediate relays KA1 and KA2, a time relay KT and an autotransformer TA1; the starter also comprises a protection circuit which consists of a power transformer T, diodes VD1-VD5, capacitors C1-C3, a three-terminal integrated voltage stabilizer IC1, a potentiometer RP, a time base integrated circuit IC2 and a relay K. The motor reduced-voltage starter has low cost, stable performance and strong practical applicability, and is simply manufactured.

Description

The motor reduced-voltage starter

Technical field

The utility model relates to a kind of reduced-voltage starter, particularly a kind of motor reduced-voltage starter.

Background technology

To the influence of electrical network and near electric equipment, require the above high power motor of 15kW must adopt the decompression type start mode when starting for reducing high power motor.Decompression starting mode at present commonly used has two kinds of autotransformer decompression starting and star one triangle decompression startings, their common ground is all to adopt the time relay that motor is switched to normal operation from starting state, this Starting mode cost height, unstable properties, practicality are not strong.

The utility model content

The purpose of this utility model just is to provide a kind of cost low, stable performance, practical motor reduced-voltage starter.

To achieve these goals; the technical solution adopted in the utility model is such: motor reduced-voltage starter of the present utility model; comprise main circuit and decompression starting control circuit; the decompression starting control circuit is by starting button S1; master controller Q2a; Q2b; A.C. contactor KM1-KM3; auxiliary relay KA1; KA2; time relay KT and autotransformer TA1 form; also comprise protective circuit; protective circuit is by power transformer T; diode VD1-VD5; capacitor C1-C3; three terminal integrated voltage stabilizer IC1; potentiometer RP; time-base integrated circuit IC2 and relay K are formed; described power transformer; diode VD1-VD4 connects into a bridge rectifier; the input of power transformer connects the normally-closed contact of KM3 respectively; the normally opened contact of KM1; the input of described three terminal integrated voltage stabilizer IC1; output is electrically connected capacitor C 1 respectively; C2 is three end integrated stable voltage circuits; be connected with electric bridge then; two pins and five pins of described time-base integrated circuit IC2 are electrically connected capacitor C 3 respectively; C4; six pins are electrically connected potentiometer RP; be connected with three end integrated stable voltage circuits then, described relay K be connected between time-base integrated circuit IC2 three pins and eight pins after diode D5 is in parallel.

As preferably, described three terminal integrated voltage stabilizer IC1 selects LM7812 type three terminal integrated voltage stabilizer for use; Time-base integrated circuit IC2 selects the NE555 time-base integrated circuit for use.

As preferably, it is the power transformer of 15V that power transformer T selects 5W, secondary voltage for use.

Compared with prior art, advantage of the present utility model is: cost is low, making is simple, stable performance, and practicality is stronger.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

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

Referring to Fig. 1; motor reduced-voltage starter of the present utility model; comprise main circuit 1 and decompression starting control circuit 2; decompression starting control circuit 2 is by starting button S1; master controller Q2a; Q2b; A.C. contactor KM1-KM3; auxiliary relay KA1; KA2; time relay KT and autotransformer TA1 form; also comprise protective circuit 3; (T selects 5W for use to protective circuit 3 by power transformer T; secondary voltage is the power transformer of 15V); diode VD1-VD5 (VD1-VD5 all selects the 1N40071N silicon rectifier diode for use); (C1 and C2 all select the aluminium electrolytic capacitor of withstand voltage for 25V for use to capacitor C1-C3; C3 and C4 all select monolithic capacitor for use); three terminal integrated voltage stabilizer IC1 (IC1 selects LM7812 type three terminal integrated voltage stabilizer for use); potentiometer RP (RP selects small-sized potentiometer or variable resistance for use); time-base integrated circuit IC2 (IC2 selects the NE555 time-base integrated circuit for use) and relay K (K selects the 12V direct current relay for use) are formed; described power transformer; diode VD1-VD4 connects into a bridge rectifier; the input of power transformer connects the normally-closed contact of KM3 respectively; the normally opened contact of KM1; the input of described three terminal integrated voltage stabilizer IC1; output is electrically connected capacitor C 1 respectively; C2 is three end integrated stable voltage circuits; be connected with electric bridge then; two pins and five pins of described time-base integrated circuit IC2 are electrically connected capacitor C 3 respectively; C4; six pins are electrically connected potentiometer RP; be connected with three end integrated stable voltage circuits then, described relay K be connected between time-base integrated circuit IC2 three pins and eight pins after diode D5 is in parallel.

After connecting QS, Q2 is placed " automatically " position, click S1, the KM1 adhesive of switching on, its normally open contact is connected, and makes KM2 energising adhesive, after the normally open contact of KM2 is connected, unclamp S1, KM1 and KM2 still keep attracting state, exchange 380V voltage and make the running of motor M decompression starting after the TA1 decompression.Meanwhile, another normally open contact of KM2 is connected, the KT work of switch on, the normally open contact of KT after delaying time with the power connection of KA1, the KA1 adhesive, the normally open contact of KA1 is the power connection of KM3, the KM3 adhesive, and its normally open contact is connected, normally closed interlock disconnects, KM1 and KM2 outage, motor M has finished the decompression starting process, enters the full voltage operating condition.

After the KM1 adhesive, one group normally open contact is connected the primary circuit of power transformer T, produces the 15V induced voltage at the secondary winding two ends of T, this voltage after VDI～VD4 rectification, CI filtering and IC1 voltage stabilizing, generation+12V (Vcc) voltage.+ 12V voltage also charges to C3 (resistance of RP and the capacity of C3 are decided according to protection delay time T) through RP except that supplying with IC2.

If the decompression starting control circuit 2 of motor is working properly, after then the normally open contact of KM3 was connected, its normally closed interlock cut off the input electric power loop of T, and protective circuit 3 is quit work when motor runs well.

If certain reason breaks down KT or decompression starting control circuit 2, exceed schedule time 2 times in the time of still can not switching to normal operation, then protective circuit 3 conduction times (being KM1 normally open contact turn-on time) can prolong, make 2 pin and the 6 pin voltages of IC2 rise to 2Vcc/3, circuit upset in the IC2,3 pin become low level by high level, make the K adhesive, its normally open contact is connected, and with the dump of KM1 and KM2, makes decompression starting control circuit 2 enter guard mode; Simultaneously, also make KA2 energising adhesive, the normally open contact of KA2 is connected, and alarm sends chimes of doom.

Claims

1. motor reduced-voltage starter; comprise main circuit and decompression starting control circuit; the decompression starting control circuit is by starting button S1; master controller Q2a; Q2b; A.C. contactor KM1-KM3; auxiliary relay KA1; KA2; time relay KT and autotransformer TA1 form; it is characterized in that: also comprise protective circuit; protective circuit is by power transformer T; diode VD1-VD5; capacitor C1-C3; three terminal integrated voltage stabilizer IC1; potentiometer RP; time-base integrated circuit IC2 and relay K are formed; described power transformer; diode VD1-VD4 connects into a bridge rectifier; the input of power transformer connects the normally-closed contact of KM3 respectively; the normally opened contact of KM1; the input of described three terminal integrated voltage stabilizer IC1; output is electrically connected capacitor C 1 respectively; C2 is three end integrated stable voltage circuits; be connected with electric bridge then; two pins and five pins of described time-base integrated circuit IC2 are electrically connected capacitor C 3 respectively; C4; six pins are electrically connected potentiometer RP; be connected with three end integrated stable voltage circuits then, described relay K be connected between time-base integrated circuit IC2 three pins and eight pins after diode D5 is in parallel.

2. motor reduced-voltage starter according to claim 1 is characterized in that: described three terminal integrated voltage stabilizer IC1 selects LM7812 type three terminal integrated voltage stabilizer for use; Time-base integrated circuit IC2 selects the NE555 time-base integrated circuit for use.

3. motor reduced-voltage starter according to claim 1 is characterized in that: it is the power transformer of 15V that power transformer T selects 5W, secondary voltage for use.