CN2145470Y

CN2145470Y - Multifunction motor protector

Info

Publication number: CN2145470Y
Application number: CN 92228196
Authority: CN
Inventors: 杨发生; 杨梦云
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-07-15
Filing date: 1992-07-15
Publication date: 1993-11-03
Anticipated expiration: 2002-07-15

Abstract

The utility model relates to a multifunctional motor protector, which is composed of a pressure reducing circuit, an A/D converting interface, a three-phase power display circuit, a phase sequence distinguishing and triggering control circuit, an executing circuit, a phase sequence indicating and fault alarming circuit, an electric voltage sampling circuit, an electric potential comparison circuit, a temperature sampling and converting circuit, a power circuit, a thermostat, a casing, etc. The utility model can monitor the three variation factors of a motor synchronously, wherein, the three variation factors are the phase sequence of the power supply, the supply voltage, the temperature increment of the motor, etc; so the motor runs under a rigorous monitoring mode, and the motor is provided with omnidirectional protection. The utility model has the advantages of safety and low cost, and can ensure the safety of the motor.

Description

Multifunction motor protector

The utility model relates to a kind of protector, particularly a kind of multifunctional motor-driven motor protector.

Motor tends to occur various faults in running, for example: blown fuse, power supply phase shortage, switch or probe of contactor loose contact, motor two-phase short circuit, turn-to-turn short circuit, single-line to ground fault, asymmetric its difference of three phase supply voltage surpass 5%, three-phase voltage is crossed low or too high, overload operation, fan damages, air inlet stops up, starting frequent, power supply phase sequence connects anti-etc., the capital makes the serious heating burnout of motor, plant equipment damage because of counter-rotating, and some fault is entail dangers to personnel's life security also.

When traditional protection scheme is based on motor and produces fault, a kind of protection scheme or a kind of electric equipment products are designed in the variation of some physical quantitys of its voltage, electric current or temperature.For example: utilize the variation of voltage, design the scheme that adopts voltage relay; Utilize the variation of electric current, design the scheme that adopts current relay, manufactured and designed thermal relay; Utilize variation of temperature to adopt temperature relay scheme etc., people had made the electronic type phase failure protector again in recent years.For connect the fault that makes the motor counter-rotating cause plant equipment to be damaged on the contrary because of power phase, also nobody designed perfect protector.In a word, traditional protector can only be protected a certain fault of motor, can not satisfy far away and produce actual needs, and their protection effect is not good enough, have in addition do not play protective effect.When requiring that the running of motor implemented omnibearing protection, protection scheme complexity then, protection equipment is various, and the debugging maintenance difficult costs an arm and a leg, the non-general user acceptance of being willing to.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and a kind of multifunctional motor-driven motor protector that can carry out synchronous monitoring to three changing factors such as the power supply phase sequence of motor, supply power voltage, electric machine temperature rise is provided.

The purpose of this utility model can reach by following measure: the utility model comprises executive circuit, electromotor control circuit, motor, voltage sampling circuit, the current potential comparison circuit, power circuit, housing, attaching plug, it is characterized in that: also have reduction voltage circuit, A/D translation interface and three phase mains display circuit, phase sequence cognition and trigger control circuit, phase sequence indication and failure alarm circuit, temperature sampling and change-over circuit, thermostat, the output one tunnel of reduction voltage circuit is delivered to phase sequence cognition and trigger control circuit via A/D translation interface and three phase mains display circuit, the current potential comparison circuit is delivered to via voltage sampling circuit in another road, phase sequence cognition and trigger control circuit are delivered in the output of current potential comparison circuit, phase sequence indication and failure alarm circuit are delivered in the output one tunnel of phase sequence cognition and trigger control circuit, another road is via executive circuit, electromotor control circuit is delivered to motor, and thermostat is delivered to the current potential comparison circuit from the detected signal of motor via temperature sampling and change-over circuit.

The purpose of this utility model can also reach by following measure: thermostat is embedded in the magnetosheath, and magnetosheath is attached on the stator of motor, and thermostat is connected with housing by connecting.Power on light LED1～LED3 in suitable phase indicator light LED4, anti-phase indicator light LED5, A/D translation interface and the three phase mains display circuit in phase sequence indication and the failure alarm circuit is housed on the panel of housing.Dropping resistor R1, R2 in the reduction voltage circuit,

R3

1,2,3 pin of inverter A1, A2, A3 and the integrated circuit (IC) 2 by integrated circuit (IC) 1 respectively join, the Q end of IC2 joins by R19 and triode BG1 base stage, the coil tandem of BG1 collector electrode and LED 4, relay J, the Q end of IC2 joins with the emitter-base bandgap grading of BG1 by R20, LED 5.Dropping resistor R1, R2 in the reduction voltage circuit, R3 join by input 1 end of amplifier F1～F3 in R7～R9 and D5～R7 and the integrated circuit (IC) 3 respectively, and output 3 ends of F1～F3 join by the S end of D8～D10, R16 and IC2 respectively.Thermistor Rt in the thermostat and input 1 end of the amplifier F4 in the integrated circuit (IC) 3 join, and output 3 ends of F4 join by the S end of D11, R16 and IC2.

Fig. 1 is a functional-block diagram of the present utility model;

Fig. 2 is a contour structures schematic diagram of the present utility model;

Fig. 3 is an electrical schematic diagram of the present utility model.

The utility model is described in further detail below in conjunction with accompanying drawing (embodiment):

With reference to Fig. 1, Fig. 2, the utility model is made up of join power display circuit 2, phase sequence cognition and trigger control circuit 3, actuator 4, electromotor control circuit 5, motor 6, phase sequence indication and failure alarm circuit 7, voltage sampling circuit 8, current potential comparison circuit 9, temperature sampling and change-over circuit 10, supply voltage 11, thermostat 12, shell 13 etc. of reduction voltage circuit 1, A/D translation interface and three.Thermostat 12 is embedded in the magnetosheath, and magnetosheath is attached on the motor stator in the motor connecting cartridge, and as far as possible away from charged position, its distance should be greater than 6mm.Thermostat 12 links to each other with housing 13 by lead-out wire.Be equipped with on the panel of housing 13 along phase indicator light LED4, anti-phase indicator light LED5 and power supply indicator LED1～LED3.

With reference to Fig. 3, reduction voltage circuit 1 is made up of resistance R 1～R3 etc.; A/D translation interface and three phase mains display circuit 2 are made up of IC1, R4～R5, LED1～LED3 etc.; Phase sequence cognition and trigger control circuit 3 are made up of IC2 etc.; Executive circuit 4 is made up of R19, BG1, relay J, triode D12 etc.; Circuit for controlling motor 5 is made up of A.C. contactor QC1 etc.; Phase sequence indication and failure alarm circuit 7 are made up of R20, LED4, LED5 etc.; Voltage sampling circuit 8 is made up of R7～R17, D5～D7 etc.; Current potential comparison circuit 9 is made up of the F1～F3 among the IC3, D8～D10, potentiometer W etc.; Temperature sampling and change-over circuit 10 are made up of F4, the D11 etc. among thermistor Rt, the IC3 in the thermostat 12; Power circuit 11 is made up of transformer B, rectifier bridge D1～D4, capacitor C 1, C2, three terminal regulator IC4 etc.

When the connection power supply in order of motor power supply, during voltage rating, power on light-Huang, green, red three lamp (LED1, LED2, LED3) bright, " Q " end that triggers controller IC 2 is zero, " Q " end is 1, phase sequence order indicator light green light (LED4) is bright, negative phase sequence indicator light red light (LED5) extinguishes, the charged adhesive of relay J, its a pair of normally opened contact J1 closure, and this is to be serially connected in the control loop of motor to the contact, therefore, for the clean boot of motor is got ready, as long as press start button, just motor is put into operation.

When the phase sequence of power supply becomes backward to supply with motor because of certain reason misconnection; behind the IC2 phase sequence cognition; the IC2 upset; " Q " end becomes 1; " Q " holds vanishing; order indicator light green light this moment (LED4) extinguishes; backward indicator light red light (LED5) is bright; the not charged release condition that are in of relay J; normally opened contact J1 disconnects; motor can not be activated because of its control loop has breakpoint, and promptly the protector refusal is carried out the instruction of actuating motor, has reached the purpose of phase sequence.

When phase sequence connects correct; but supply voltage is crossed low or three-phase voltage is asymmetric and its value surpasses 5%; the voltage of the reflection supply voltage instantaneous value of taking through voltage sampling circuit then; through D5; D6; import potential comparator F1 after the D7 rectification respectively; F2; "-" end among the F3 is just being gone relatively with the reference voltage value of input "+" end; if there is phase factor "-" terminal potential to be lower than "+" terminal potential at the moment; then this phase comparator just has high potential output; through the rectifier switch pipe; R16 transport to IC2's " S " end; making " Q " end is zero; " Q " end is 1; accident alarming lamp red light (LED5) is bright; relay J is in release condition; J1 cut-offs; motor can not be activated; promptly when power supply voltage is undesired; the protector refusal is carried out the instruction of actuating motor, and the prevention protective effect has been played in the protection of motor.

Motor when normal operation; because of certain reason; the serious asymmetric or phase failure of 5% or three-phase voltage of the voltage decline overrate of its power supply etc.; then the instantaneous voltage value taked of voltage sample circuit is through D5; D6; difference input comparator after the D7 rectification; wherein the voltage of the rarest phase is lower than reference voltage value; comparator F1; F2; " S " end that has high potential to export IC2 to is always arranged among the F3; make its upset; " Q " end becomes 1; " Q " holds vanishing; green indicating lamp (LED4) extinguishes; accident indicator light red light (LED5) is bright; relay J dead electricity release → J1 cut-offs → contactor QC dead electricity release → contact QC disjunction → motor dead electricity withdraws from running, that is to say protector can protect because of power supply voltage undesired, the caused motor fault of the phase failure.

In motor running way, when two-phase short circuit or single phase ground fault take place, the voltage of then short circuit phase can reduce, electric current can increase, and the very fast rising of the temperature rise meeting of motor, caused and as above chatted similar malfunction, remove comparator F1, F2, the rarest one has high potential to export to outside " S " end among the F3, be used for reflecting that the comparator F4 that motor temperature changes also might have high potential to export " S " end to, making IC2 upset " Q " end is 1, " Q " holds vanishing, green light (LED4) extinguishes, accident alarming lamp red light (LED5) is bright, and relay J dead electricity release → J1 disconnection → contactor QC dead electricity release → contact QC disjunction → motor dead electricity withdraws from running.Be that protector can be protected the fault that causes because of the defective of motor own, fault can further not enlarged.

When motor transships in running; terminal voltage is too high; the motor turn-to-turn short circuit; fan damages; air inlet stops up or starts when frequent; the temperature rise meeting of motor constantly raises; when temperature rise reaches near the limit rated temperature-rise of motor (this protector with the variations in temperature of thermostat monitoring stator core in motor); behind the temperature sampling and change-over circuit (Rt) conversion of this protector; the voltage of input comparator F4 "-" end can be lower than the reference voltage of sending into "+" end; the F4 output has high potential to transport to " S " end; make the IC2 upset; " Q " end becomes 1; " Q " holds vanishing; green light LED4 extinguishes; red LED5 is bright for the accident alarming lamp, and relay J dead electricity release → contact QC disjunction → motor dead electricity withdraws from running.Motor has obtained protection, promptly every reach capacity fault of allowable temperature of motor temperature that makes, and this protector all can give effective protection.

The utility model has following advantage compared to existing technology:

1. microelectronic integrated circuit, defencive function is complete, and compact conformation is installed, debugging easily, and is with low cost, safe and reliable; Also increased in addition the phase sequence function of motor.

2. integrate traditional motor protection scheme, various three phase alternating current motors are had omnibearing protection function and prevention defencive function; And the user can adjust sensitivity as required; Also have power supply demonstration, phase sequence indication, accident alarming indication etc. in addition, be convenient to the running status that the staff grasps motor.

Claims

1; a kind of multifunctional motor-driven motor protector; comprise executive circuit 4; electromotor control circuit 5; motor 6; voltage sampling circuit 8; current potential comparison circuit 9; power circuit 11; housing 13; attaching plug 14; it is characterized in that: also have reduction voltage circuit 1; A/D translation interface and three phase mains display circuit 2; phase sequence cognition and trigger control circuit 3; phase sequence indication and failure alarm circuit 7; temperature sampling and change-over circuit 10; thermostat 12; the output one tunnel of reduction voltage circuit 1 is delivered to phase sequence cognition and trigger control circuit 3 via A/D translation interface and three phase mains display circuit 2; current potential comparison circuit 9 is delivered to via voltage sampling circuit 8 in another road; phase sequence cognition and trigger control circuit 3 are delivered in the output of current potential comparison circuit 9; phase sequence indication and failure alarm circuit 7 are delivered in the output one tunnel of phase sequence cognition and trigger control circuit 3; another road is via executive circuit 4; electromotor control circuit 5 is delivered to motor 6, and thermostat 12 is delivered to current potential comparison circuit 9 from motor 6 detected signals via temperature sampling and change-over circuit 10.

2, protector according to claim 1 is characterized in that: thermostat 12 is embedded in the magnetosheath, and magnetosheath is attached on the stator of motor 6, and thermostat 12 is connected with housing 13 by connecting.

3, protector according to claim 1 is characterized in that: the power on light LED1～LED3 in suitable phase indicator light LED4, anti-phase indicator light LED5, A/D translation interface and the three phase mains display circuit 2 in phase sequence indication and the failure alarm circuit 7 is housed on the panel of housing 13.

4, protector according to claim 1; it is characterized in that: dropping resistor R1, the R2 in the reduction voltage circuit 1, R3 1,2,3 pin of inverter A1, A2, A3 and the integrated circuit (IC) 2 by integrated circuit (IC) 1 respectively join; the Q end of IC2 joins by R19 and triode BG1 base stage; the coil tandem of BG1 collector electrode and LED 4, relay J, the Q end of IC2 joins with the emitter-base bandgap grading of BG1 by R20, LED 5.

5, protector according to claim 1; it is characterized in that: dropping resistor R1, the R2 in the reduction voltage circuit 1, R3 join by input 1 end of amplifier F1～F3 in R7～R9 and D5～R7 and the integrated circuit (IC) 3 respectively, and output 3 ends of F1～F3 join by the S end of D8～D10, R16 and IC2 respectively.

6, protector according to claim 1 is characterized in that: thermistor Rt in the thermostat 12 and input 1 end of the amplifier F4 in the integrated circuit (IC) 3 join, and output 3 ends of F4 join by the S end of D11, R16 and IC2.