CN2331128Y

CN2331128Y - Motor start-up self-control device

Info

Publication number: CN2331128Y
Application number: CN 97212064
Authority: CN
Inventors: 郁洪兴
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-08
Filing date: 1997-03-08
Publication date: 1999-07-28
Anticipated expiration: 2007-03-08

Abstract

The utility model provides a motor start-up self-control device, which is composed of a self-control unit A, a motor start-up self-control unit B, a fault alarming unit C, a motor protection unit D, and a motor start-up unit E, wherein, the units B, C, and D are all controlled by the unit A. The utility model can finish starting up of a motor with pressure reducing under the control of different pressure relief devices according to the speed of rotation of motor; the motor is in operational process with total pressure, the speed of rotation is reduced when the conditions are happened such as overload, phase interruption, low supply voltages, etc.; when the slip ratio S is more than 0.06 the audible and visual alarm can be sent out; when the slip ratio S is no less than 0.2, the power supply of the motor can be cut off, and the motor can be prevented from being damaged.

Description

The motor start-up automatic control equipment

The present invention is a motor start-up automatic control equipment that is used for motor start-up, fault alarm, motor protection.

Existing motor start-up control device such as QX type, XJO1 type etc., same relay when automatic control unit is, after finishing motor start-up, other effects that do not recur, motor protection is born by other devices, and the fault-free warning system.

Motor start-up automatic control equipment automatic control unit provided by the invention is made up of a cover velocity of electrons relay, after finishing motor start-up, also has fault alarm and motor protection effect.

Motor start-up automatic control equipment of the present invention, its control block diagram such as Fig. 1, by automatic control unit A, motor start-up automatic control unit B, fault alarm unit C, the motor protection cells D, motor start-up unit E forms, and M is a motor.A unit controls B, C, D unit, B, D unit controls E unit are finally controlled the startup of motor M and are stopped.Automatic control unit A is made up of a cover velocity of electrons relay J MP among Fig. 2, and motor start-up automatic control unit B is by the contact JMP of velocity of electrons relay J MP _-1, composition such as auxiliary relay JZ, fault alarm unit C is by the contact JMP of velocity of electrons electrical equipment JMP _-1, compositions such as acoustic alarm device HA, light crossing-signal HE, the motor protection cells D is by another contact JMP of velocity of electrons relay _-2, auxiliary relay JZ forms, motor start-up unit E is by A.C. contactor 1CJ, 2CJ, 3CJ, push-button switch QT, QA and indicator light HL ₁, HL ₂Deng composition, the E unit is according to the Starting mode difference, and A.C. contactor can increase thereupon or reduce, and connects also different.M is a motor.

Fig. 2 is the automatic control circuit sketch that is applicable to star triangle decompression starting and extend-triangle one-level decompression starting, Fig. 2 a combines with Fig. 2 b and forms star triangle decompression starting control circuit, and Fig. 2 a combines with Fig. 2 C and forms extend-triangle one-level decompression starting automatic control circuit.The moving control of decompression starting order is achieved in that presses QA, 1CJ, 2CJ simultaneously electric adhesive, 2CJ _-1Self-locking, 3-5 connects, and the electronic M winding of Fig. 2 b star connects startup, or makes Fig. 2 c motor M winding extend-triangle connect startup.1CJ _-1Disconnect, 5-11 is obstructed, must just can carry out the transition to the operation of triangle total head through the decompression starting process to guarantee motor, and meanwhile JMP gets electric work, the rotating speed of motor M is monitored, when the rotating speed of M is elevated to rated speed.JMP _-1Adhesive, 3-13 disconnects, and 3-17 connects, and JZ gets electric adhesive, JZ _-1Self-locking, JZ _-2Engage, be 3CJ _-1Disconnecting 5-9 still keeps connection to get ready JZ _-3Disconnect, 5-7 also leads to, and the 1CJ dead electricity discharges, and Fig. 2 b star connects disconnection or Fig. 2 c extend-triangle connects disconnection.1CJ _-1Engage, 5-11 connects, and 3CJ gets electric adhesive, motor M total head operation among Fig. 2 b or Fig. 2 c.The decompression starting process finishes.3CJ _-1Adhesive 13-15 connects, for fault alarm is got ready.

Fault alarm and motor protection be achieved in that since JMP still electric work; continuation is monitored the rotating speed of motor M; in case motor M be in operation transship, the phase failure, situation such as supply voltage is on the low side, rotating speed slows down, revolutional slip S＞0.06 o'clock JMP _-1Discharge, 3-17 disconnects, and 3-13 connects, and fault alarm unit C gets electric, sends the sound and light alarm signal.Fault is got rid of, and motor M rotating speed returns to rated value, JMP _-1Adhesive, 3-13 disconnects, fault alarm unit dead electricity, alarm release; If fault can not in time be got rid of, motor M rotating speed further descends, revolutional slip S 〉=0.2, JMP _-2Adhesive, 17-19 disconnects, and the JZ dead electricity discharges, JZ _-2Disconnect, 5-9 is obstructed, and the 2CJ dead electricity discharges, and 3-5 disconnects obstructed, and the 3CJ dead electricity discharges, and motor M dump is finished the protection to motor M, and meanwhile, JMP is dead electricity also, state before entire circuit returns to and starts.

Fig. 3 is frequency sensitive trheostat decompression starting and bi-motor total head sequence starting automatic control circuit sketch, and Fig. 3 a combines with Fig. 3 b, forms frequency sensitive trheostat decompression starting automatic control circuit.BP is a frequency sensitive trheostat, and Fig. 3 a combines with Fig. 3 c, forms bi-motor total head sequence starting automatic control circuit.Automatic control unit A among Fig. 3 a and Fig. 2 a, motor start-up automatic control unit B, fault alarm unit C, basic identical, be in the motor protection cells D, another contact JMP of velocity of electrons relay J MP _-2Directly be serially connected in the loop of A.C. contactor 1CJ.

Automatic control unit A; motor start-up automatic control unit B; fault alarm unit C; also portable is to the auto coupling decompression start control device for the motor protection cells D, and as Fig. 4, TA is the self-coupling decompression device; and single motor full voltage starting device; in device such as impedance decompression starting, make the motor starter performance better, more become complete.

Claims

1. motor start-up automatic control equipment, it is characterized in that: this device has automatic control unit A, motor start-up automatic control unit B, fault alarm unit C, motor protection cells D, and B, C, three unit of D all are controlled by automatic control unit A.

2. motor start-up automatic control equipment according to claim 1 is characterized in that: automatic control unit A is made up of a cover velocity of electrons relay J MP, and motor start-up automatic control unit B is by a pair of normally-open normally-close contact JMP of velocity of electrons relay J MP _-1, auxiliary relay JZ forms, fault alarm unit C is by a pair of normally-open normally-close contact JMP of velocity of electrons device JMP _-1, compositions such as acoustic alarm device HA, light crossing-signal HE, the motor protection cells D is by another contact JMP of velocity of electrons relay J MP _-2, composition such as auxiliary relay JZ or A.C. contactor IJC.