CN201838993U

CN201838993U - Multiple protection device for monitoring faults of motor

Info

Publication number: CN201838993U
Application number: CN2010205444699U
Authority: CN
Inventors: 傅哲龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-25
Filing date: 2010-09-25
Publication date: 2011-05-18
Anticipated expiration: 2020-09-25

Abstract

The utility model relates to a protection device, particularly to a multiple protection device for monitoring faults of a motor. The protection device comprises a temperature acquisition circuit, a current acquisition circuit, a voltage acquisition circuit, an analog switch circuit, an A /D (analog to digital) conversion circuit, a singlechip control circuit, an alarm circuit and a drive circuit. Signals are collected by the temperature acquisition circuit, the current acquisition circuit and the voltage acquisition circuit, and are transmitted to the A/D conversion circuit after detected by the analog switch circuit; and the signals converted by the A/D conversion circuit are transmitted to the singlechip control circuit for detection, and then are transmitted to the alarm circuit and the drive circuit through the singlechip control circuit. By adopting the protection device, voltage, current, and surface temperature of the motor can be detected simultaneously, signals of line voltage and balanced current of load current are collected, and the temperature of a coil winding of the motor can be collected by a temperature sensor, finally an alarm action is controlled and judged by the singlechip. Therefore, the protection device has the characteristics of high sensitivity, high accuracy, and stable property.

Description

A kind of multiple monitoring motor fault protective device

Technical field

The utility model relates to a kind of protective device, particularly is a kind of multiple monitoring motor fault protective device.

Background technology

In every year, motor is because of phase shortage or overtension or low excessively to cause burning out coil countless, brings enormous economic loss for people's productive life.Existing protector has only detectable voltage signals; because of the fluctuation of the area power grid that has also has the work that multiple harmonic also can interference voltage type protector more greatly; the protection monitoring function major part of city's field electric motor is current mode or voltage-type, and so frequent misoperation and tripping are done.

The utility model content

The purpose of this utility model provides a kind of employing voltage, electric current, motor surfaces temperature and detects simultaneously, sensitive high, precision accurately, the multiple monitoring motor fault protective device of stable performance.

The technical scheme that the utility model adopted is such: a kind of multiple monitoring motor fault protective device; comprise temperature collection circuit; the current acquisition circuit; voltage collection circuit; analog switching circuit; the A/D change-over circuit; single chip machine controlling circuit; warning circuit; drive circuit; described temperature collection circuit; the current acquisition circuit; after the voltage collection circuit acquired signal; signal is transferred to the A/D change-over circuit after analog switching circuit detects; after signal after the A/D change-over circuit will be changed was transferred to the single chip machine controlling circuit detection, single chip machine controlling circuit transferred signals to warning circuit and drive circuit.

Described analog switching circuit is capable of circulation to the switch detection in turn in real time of temperature collection circuit, current acquisition circuit, voltage collection circuit, and be 30 μ s its switching time.

Described temperature collection circuit is gathered the motor winding winding temperature through temperature sensor, and conversion of signals is become small d. c. voltage signal.

Described temperature collection circuit connects a high accuracy and amplifies arithmetic unit, and this amplification arithmetic unit can be amplified to 1000 times by resistance 2R4 maximum.

Described single chip machine controlling circuit connects a watchdog circuit.

By adopting the aforementioned techniques scheme; the beneficial effects of the utility model are: this multiple monitoring motor fault protective device adopts voltage, electric current, motor surfaces temperature to detect simultaneously; gather the balanced balanced current of line voltage signal and load current; temperature sensor is gathered the motor winding winding temperature; after Single-chip Controlling is judged actuation of an alarm, have sensitive high, precision accurately, the characteristics of stable performance.

Description of drawings

Fig. 1 is a frame structure schematic diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1; a kind of multiple monitoring motor fault protective device; comprise temperature collection circuit, current acquisition circuit, voltage collection circuit, analog switching circuit, A/D change-over circuit, single chip machine controlling circuit, warning circuit, drive circuit; behind described temperature collection circuit, current acquisition circuit, the voltage collection circuit collection signal; after signal after analog switching circuit detects the back signal and is transferred to A/D change-over circuit, A/D change-over circuit and will changes was transferred to the single chip machine controlling circuit detection, single chip machine controlling circuit transferred signals to warning circuit and drive circuit.

As shown in Figure 2, after power supply 380V electricity is connected, by current probe L1, current probe L2, current probe L3 gathers corresponding current signal, when the phase line power supply passes current probe L1 and has electric current to pass through, the elementary generation ac induction voltage of current probe L1 signal, this voltage signal charges to capacitor C 4 through diode D1 rectification, resistance R 7 current limlitings are after capacitor C 10 and capacitor C 13 filtering, resistance R 10 is dividing potential drop over the ground, adjust R10 may command discharging and recharging the time to capacitor C 4, also adjustable current size induced voltage output simultaneously, the current signal that current probe L1 is gathered is input to the 13rd end of analog switching circuit U3, the continuous diverter switch of analog switching circuit U3 the 3rd pin passes the signal to A/D change-over circuit U4, with resistance 3R10 dividing potential drop over the ground, avoid causing wrong report when being connected to the A/D change-over circuit because of U3 the 3rd pin is unsettled.Other current probe L2, current probe L13 current detecting principle are identical, no longer repeat here.

Gather the correspondent voltage signal by voltage transformer B1, voltage transformer B2, voltage transformer B3, voltage transformer B1 was with output in 100: 1, when B1 level output of voltage transformer is lower than 1.0V, be judged as phase shortage, voltage signal is through diode 1D1 rectification, electric capacity 1C1 filtering, resistance 1R1 filtering, be connected to analog switching circuit U3 the 1st pin through the output of resistance 1R7 current limliting, the continuous diverter switch of analog switching circuit U3 the 3rd pin passes the signal to A/D change-over circuit U4.Other voltage transformer B2, the identical no longer repetition here of voltage transformer B3 voltage detecting principle.

By temperature sensor TK, resistance 2R1, resistance 2R3, resistance 2R4, resistance 2R5, form temperature collection circuit, temperature collection circuit connects a high accuracy and amplifies arithmetic unit, this amplification arithmetic unit can be amplified to 1000 times by resistance 2R4 maximum, Acquisition Circuit is gathered the motor winding winding temperature through temperature sensor, convert small d. c. voltage signal by temperature sensor TK temperature reception room sensor collecting temperature signal to through temperature sensor, go up connection 5V power supply through resistance 2R1 temperature sensor TK is produced accessory power supply, through resistance 2R3, resistance 2R5 is connected to and amplifies arithmetic unit U2 the 3rd end, output to analog switching circuit U3 the 2nd end by the 6th pin after amplifying the inner amplification of arithmetic unit U2, the continuous diverter switch of analog switching circuit U3 the 3rd pin passes the signal to A/D change-over circuit U4.

Analog switching circuit U3 circuit is capable of circulation to the switch detection in turn in real time of temperature collection circuit, current acquisition circuit, voltage collection circuit, and be 30 μ s its switching time.

A/D change-over circuit U4 the 2nd pin connects analog switching circuit U3 the 3rd pin and receives the data-signal that analog switching circuit U3 sends, through A/D change-over circuit U4 inter-process the analog signal of importing is changed into digital signal, by 5 of A/D change-over circuit U4,6,7 pin are connected respectively to the 1st of U1,2, the I/O port of 3 ends, composition data detects communication, single chip machine controlling circuit U1 is three kinds of unlike signals to being gathered respectively, logic determines to fault, go out the internal data table through operational analysis, avoid misoperation and tripping to do, guarantee accuracy, when single chip machine controlling circuit U1 detects data that A/D change-over circuit U4 provided and surpasses single chip machine controlling circuit U1 inner setting value, divide three tunnel outputs, first via single chip machine controlling circuit U1 the 39th pin output low level, promote loudspeaker Y through resistance 3R9 and send the sound, the second road single chip machine controlling circuit U1 the 32nd end output low level makes triode Q1 conducting promote relay J 1 adhesive through resistance 4R1, drive contactor KM action separating brake, the 3rd makes LED1 get electroluminescence by single chip machine controlling circuit U1 the 16th pin output low level through resistance 3R1

Described single chip machine controlling circuit U1 connects a house dog circuit U 5, and single chip machine controlling circuit U1 internal processes is recovered automatically, avoids single chip machine controlling circuit U1 internal processes to be in the endless loop state.

More than show and described basic principle of the present utility model and principal character and advantage thereof; the technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the explanation just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. multiple monitoring motor fault protective device; it is characterized in that: comprise temperature collection circuit; the current acquisition circuit; voltage collection circuit; analog switching circuit; the A/D change-over circuit; single chip machine controlling circuit; warning circuit; drive circuit; described temperature collection circuit; the current acquisition circuit; after the voltage collection circuit acquired signal; signal is transferred to the A/D change-over circuit after analog switching circuit detects; after signal after the A/D change-over circuit will be changed was transferred to the single chip machine controlling circuit detection, single chip machine controlling circuit transferred signals to warning circuit and drive circuit.

2. a kind of multiple monitoring motor fault protective device according to claim 1; it is characterized in that: described analog switching circuit is capable of circulation to the switch detection in turn in real time of temperature collection circuit, current acquisition circuit, voltage collection circuit, and be 30 μ s its switching time.

3. a kind of multiple monitoring motor fault protective device according to claim 1 is characterized in that: described temperature collection circuit is gathered the motor winding winding temperature through temperature sensor, and conversion of signals is become small d. c. voltage signal.

4. a kind of multiple monitoring motor fault protective device according to claim 1 is characterized in that: described temperature collection circuit connects a high accuracy and amplifies arithmetic unit, and this amplification arithmetic unit can be amplified to 1000 times by resistance 2R4 maximum.

5. a kind of multiple monitoring motor fault protective device according to claim 1, it is characterized in that: described single chip machine controlling circuit connects a watchdog circuit.