CN104052350A - Motor control and multifunctional protection circuit for vibration tests - Google Patents

Abstract

The invention relates to a motor control and multifunctional protection circuit for vibration tests. The motor control and multifunctional protection circuit for vibration tests comprises a direct-current motor operation control circuit, a short circuit protection circuit and an open circuit detection and open circuit point judgment circuit and particularly comprises a light-operated MOS tube 1, an inductor L1, a current sensor CS1, a motor M, a short circuit comparator IC1, an open circuit comparator IC2, an optocoupler IC3, a driving audion Q1, a short circuit audion Q2, an open circuit audion Q3, a current-limiting resistor R1, a base electrode resistor R2, a blocking voltage-regulator tube DW1, an input resistor R3, a thyristor VT1 and the like. By means of the optocoupler serially connected into a main circuit and cooperative relationships of circuit parameters, short circuit protection can be performed reliably. By combining a motor operation control signal and an actual current signal, whether the main circuit is disconnected can be judged reliably, and whether the inside of the main circuit is disconnected or the motor on the site or a connected wire of the motor is disconnected can be distinguished reliably. The motor control and multifunctional protection circuit for vibration tests is high in accuracy, strong in real-time performance, low in cost, good in universality and high in reliability.

Description

Electric Machine Control and multifunctional protection circuit for vibration-testing

Technical field

The invention belongs to industrial measurement and control field, relate to a kind of circuit, particularly a kind of Electric Machine Control for vibration-testing and multifunctional protection circuit, be applicable to carrying out loosening element monitoring and the occasion of calibrating in nuclear power production equipment.

Background technology

In nuclear power plant reactor equipment and other production equipments, often need the loosening situation of component of machine in monitoring production equipment, to guarantee the safe operation of production equipment.At present, conventional scheme is: on the monitored production equipment of needs, acceleration transducer is installed, and the output signal of degree of will speed up transducer is connected to installation charge amplifier in its vicinity, again the output signal of charge amplifier is transferred to control room, simultaneously, need regularly monitoring channel to be calibrated, for this reason, the test percussion device that near the installation in monitoring point of being everlasting comes off for analog mechanical parts, during this device work, be by motor-cam mechanism driving impact member, production equipment is carried out to periodicity and clash into, and Impact energy is preset.The weak point of existing scheme is: the motor that clashes into use is mounted on nuclear power plant reactor equipment, work under bad environment, and its electric machine controller is that control room is installed, both wide aparts, therefore, when electric machine or line failure, be difficult to timely tracing trouble type and place, difficult in maintenance.

Summary of the invention

The object of the invention is the deficiency existing for prior art, propose a kind of Electric Machine Control for vibration-testing and multifunctional protection circuit.This circuit adopts the processing of circuit scheme that integrates direct current machine operation control, short-circuit protection, the open circuit functional circuits such as detection and trip point judgement.

The present invention includes direct current machine running control circuit, short-circuit protection circuit, open circuit and detect and trip point decision circuitry.

Direct current machine running control circuit comprises negative supply capacitor C 5, positive supply capacitor C 6, current-limiting resistance R1, base resistance R2, input resistance R3, biasing resistor R4, thyristor VT1, light-operated metal-oxide-semiconductor U1, drive triode Q1, stop voltage-stabiliser tube DW1, inductance L 1, inductance diode D1, motor diode D2, motor M, current sensor CS1, main power source capacitor C 4, one end of negative supply capacitor C 5 is connected with circuit negative power end VSS end, the other end ground connection of negative supply capacitor C 5, one end of positive supply capacitor C 6 is connected with circuit positive power source terminal VCC end, the other end ground connection of positive supply capacitor C 6, one end of current-limiting resistance R1 is connected with circuit positive power source terminal VCC end, the other end of current-limiting resistance R1 is connected with positive input terminal+IN end of light-operated metal-oxide-semiconductor U1, the negative input end of light-operated metal-oxide-semiconductor U1-IN end is connected with driving the collector electrode c end of triode Q1, drive the emitter-base bandgap grading e end ground connection of triode Q1, drive the base stage b end of triode Q1 to be connected with one end of base resistance R2, the other end of base resistance R2 and the anodic bonding that stops voltage-stabiliser tube DW1, the one end that stops negative electrode and the input resistance R3 of voltage-stabiliser tube DW1, the anodic bonding of one end of biasing resistor R4 and thyristor VT1, the other end of biasing resistor R4 is connected with circuit negative power end VSS end, the minus earth of thyristor VT1, the other end of input resistance R3 and motor operation control end UC end, one end of pre-resistor R16 connects, positive output end+end of light-operated metal-oxide-semiconductor U1 and one end of inductance L 1, the anodic bonding of inductance diode D1, the negative electrode of the other end of inductance L 1 and inductance diode D1, the anode of main power source capacitor C 4 and main power source anode+E hold connection, the other end of main power source capacitor C 4 is connected with main power source negative terminal-E end, negative output terminal-end of light-operated metal-oxide-semiconductor U1 is one end A1 end through the detection Kong Houyu motor M of current sensor CS1 through line, the negative electrode of motor diode D2 and one end of Optical coupling resistance R18 connect, the other end A2 end of motor M is connected with main power source negative terminal-E end, the anode of motor diode D2 is connected with main power source negative terminal-E end, the positive power source terminal of current sensor CS1+V end is connected with circuit positive power source terminal VCC end, the negative power end of current sensor CS1-V end is connected with circuit negative power end VSS end, the ground end GND end ground connection of current sensor CS1, the output OUT end of current sensor CS1 and one end of short-circuit resistance R12, one end of breaking resistor R13 connects.

Short-circuit protection circuit comprises short-circuit resistance R12, short circuit capacitance C1, pressure limiting resistance R 11, left end resistance R 9, right-hand member resistance R 10, overcurrent voltage-stabiliser tube DW2, short circuit comparator IC1, pull-up resistor R8, drive resistance R 7, c electrode resistance R5, gate electrode resistance R6, short circuit triode Q2, one end of the other end of short-circuit resistance R12 and short circuit capacitance C1, negative input end-IN of short circuit comparator IC1 holds connection, the other end ground connection of short circuit capacitance C1, one end of the positive input terminal of short circuit comparator IC1+IN end and left end resistance R 9, one end of right-hand member resistance R 10 connects, the other end ground connection of left end resistance R 9, one end of the other end of right-hand member resistance R 10 and pressure limiting resistance R 11, the negative electrode of overcurrent voltage-stabiliser tube DW2 connects, the other end of pressure limiting resistance R 11 is connected with circuit positive power source terminal VCC end, the plus earth of overcurrent voltage-stabiliser tube DW2, the positive power source terminal of short circuit comparator IC1+V end is connected with circuit positive power source terminal VCC end, the negative power end of short circuit comparator IC1-V holds ground connection, the output OUT end of short circuit comparator IC1 and one end of pull-up resistor R8, drive one end and the short-circuit alarming output US end of resistance R 7 to connect, the other end of pull-up resistor R8 is connected with circuit positive power source terminal VCC end, drive the other end of resistance R 7 and the base stage b of short circuit triode Q2 end to be connected, the emitter-base bandgap grading e end of short circuit triode Q2 is connected with circuit positive power source terminal VCC end, the collector electrode c end of short circuit triode Q2 is connected with one end of c electrode resistance R5, the other end of c electrode resistance R5 and one end of gate electrode resistance R6, the gate pole of thyristor VT1 connects, the minus earth of thyristor VT1, the other end ground connection of gate electrode resistance R6.

Open circuit to detect with trip point decision circuitry and comprise breaking resistor R13, capacitor C 2 opens circuit, steady resistance R14, stablize electric capacity C3, divider resistance R15, pre-resistor R16, upper end resistance R 17, Optical coupling resistance R18, emitter resistance R19, b electrode resistance R20, earth resistance R21, biasing voltage-stabiliser tube DW3, comparator IC2 opens circuit, optocoupler IC3, the triode Q3 that opens circuit, one end of the other end of breaking resistor R13 and the capacitor C 2 that opens circuit, positive input terminal+the IN of comparator IC2 of opening circuit holds connection, the other end ground connection of the capacitor C that opens circuit 2, one end of the other end of pre-resistor R16 and divider resistance R15, the negative electrode of biasing voltage-stabiliser tube DW3 connects, the plus earth of biasing voltage-stabiliser tube DW3, one end of the other end of divider resistance R15 and steady resistance R14, stablize one end of electric capacity C3 and negative input end-IN of the comparator IC2 that opens circuit holds connection, the other end ground connection of steady resistance R14, stablize the other end ground connection of electric capacity C3, the positive power source terminal of comparator IC2+V end that opens circuit is held and is connected with circuit positive power source terminal VCC, negative power end-the V of comparator IC2 of opening circuit holds ground connection, the output OUT end of the comparator IC2 that opens circuit and one end of upper end resistance R 17, one end of b electrode resistance R20 and breaking alarming output UB end connect, the other end of upper end resistance R 17 is connected with circuit positive power source terminal VCC end, the other end of b electrode resistance R20 is connected with the base stage b end of the triode Q3 that opens circuit, the other end of Optical coupling resistance R18 is connected with positive input terminal+IN end of optocoupler IC3, the negative input end of optocoupler IC3-IN end is connected with main power source negative terminal-E end, the emitter-base bandgap grading output e end ground connection of optocoupler IC3, the collector output c end of optocoupler IC3 and one end of emitter resistance R19, the emitter-base bandgap grading e end of triode Q3 of opening circuit connects, and the other end of emitter resistance R19 is connected with circuit positive power source terminal VCC end, and the collector electrode c of the triode Q3 that opens circuit holds and one end of earth resistance R21, the class that opens circuit type output terminal IO holds connection, the other end ground connection of earth resistance R21.

Beneficial effect of the present invention is as follows:

Utilization of the present invention tandem electric inductance in main circuit prevents current break, to guarantee to carry out reliably short-circuit protection; In conjunction with motor operation control signal and actual current signal, can reliably judge that whether main circuit opens circuit, in addition, the optocoupler branch road in parallel at the motor link place of main circuit, and then combine with the output signal that opens circuit that to tell be reliably that main circuit is that internal break or on-the-spot motor or its line open circuit.The method accuracy is high, real-time, cost is low, versatility is good, reliability is high.

Accompanying drawing explanation

Fig. 1 is circuit diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

As shown in Figure 1, a kind of Electric Machine Control for vibration-testing and multifunctional protection circuit, comprise direct current machine running control circuit, short-circuit protection circuit, open circuit and detect and trip point decision circuitry.

Direct current machine running control circuit comprises negative supply capacitor C 5, positive supply capacitor C 6, current-limiting resistance R1, base resistance R2, input resistance R3, biasing resistor R4, thyristor VT1, light-operated metal-oxide-semiconductor U1, drive triode Q1, stop voltage-stabiliser tube DW1, inductance L 1, inductance diode D1, motor diode D2, motor M, current sensor CS1, main power source capacitor C 4, one end of negative supply capacitor C 5 is connected with circuit negative power end VSS end, the other end ground connection of negative supply capacitor C 5, one end of positive supply capacitor C 6 is connected with circuit positive power source terminal VCC end, the other end ground connection of positive supply capacitor C 6, one end of current-limiting resistance R1 is connected with circuit positive power source terminal VCC end, the other end of current-limiting resistance R1 is connected with positive input terminal+IN end of light-operated metal-oxide-semiconductor U1, the negative input end of light-operated metal-oxide-semiconductor U1-IN end is connected with driving the collector electrode c end of triode Q1, drive the emitter-base bandgap grading e end ground connection of triode Q1, drive the base stage b end of triode Q1 to be connected with one end of base resistance R2, the other end of base resistance R2 and the anodic bonding that stops voltage-stabiliser tube DW1, the one end that stops negative electrode and the input resistance R3 of voltage-stabiliser tube DW1, the anodic bonding of one end of biasing resistor R4 and thyristor VT1, the other end of biasing resistor R4 is connected with circuit negative power end VSS end, the minus earth of thyristor VT1, the other end of input resistance R3 and motor operation control end UC end, one end of pre-resistor R16 connects, positive output end+end of light-operated metal-oxide-semiconductor U1 and one end of inductance L 1, the anodic bonding of inductance diode D1, the negative electrode of the other end of inductance L 1 and inductance diode D1, the anode of main power source capacitor C 4 and main power source anode+E hold connection, the other end of main power source capacitor C 4 is connected with main power source negative terminal-E end, negative output terminal-end of light-operated metal-oxide-semiconductor U1 is one end A1 end through the detection Kong Houyu motor M of current sensor CS1 through line, the negative electrode of motor diode D2 and one end of Optical coupling resistance R18 connect, the other end A2 end of motor M is connected with main power source negative terminal-E end, the anode of motor diode D2 is connected with main power source negative terminal-E end, the positive power source terminal of current sensor CS1+V end is connected with circuit positive power source terminal VCC end, the negative power end of current sensor CS1-V end is connected with circuit negative power end VSS end, the ground end GND end ground connection of current sensor CS1, the output OUT end of current sensor CS1 and one end of short-circuit resistance R12, one end of breaking resistor R13 connects.

Short-circuit protection circuit comprises short-circuit resistance R12, short circuit capacitance C1, pressure limiting resistance R 11, left end resistance R 9, right-hand member resistance R 10, overcurrent voltage-stabiliser tube DW2, short circuit comparator IC1, pull-up resistor R8, drive resistance R 7, c electrode resistance R5, gate electrode resistance R6, short circuit triode Q2, one end of the other end of short-circuit resistance R12 and short circuit capacitance C1, negative input end-IN of short circuit comparator IC1 holds connection, the other end ground connection of short circuit capacitance C1, one end of the positive input terminal of short circuit comparator IC1+IN end and left end resistance R 9, one end of right-hand member resistance R 10 connects, the other end ground connection of left end resistance R 9, one end of the other end of right-hand member resistance R 10 and pressure limiting resistance R 11, the negative electrode of overcurrent voltage-stabiliser tube DW2 connects, the other end of pressure limiting resistance R 11 is connected with circuit positive power source terminal VCC end, the plus earth of overcurrent voltage-stabiliser tube DW2, the positive power source terminal of short circuit comparator IC1+V end is connected with circuit positive power source terminal VCC end, the negative power end of short circuit comparator IC1-V holds ground connection, the output OUT end of short circuit comparator IC1 and one end of pull-up resistor R8, drive one end and the short-circuit alarming output US end of resistance R 7 to connect, the other end of pull-up resistor R8 is connected with circuit positive power source terminal VCC end, drive the other end of resistance R 7 and the base stage b of short circuit triode Q2 end to be connected, the emitter-base bandgap grading e end of short circuit triode Q2 is connected with circuit positive power source terminal VCC end, the collector electrode c end of short circuit triode Q2 is connected with one end of c electrode resistance R5, the other end of c electrode resistance R5 and one end of gate electrode resistance R6, the gate pole of thyristor VT1 connects, the minus earth of thyristor VT1, the other end ground connection of gate electrode resistance R6.

Open circuit to detect with trip point decision circuitry and comprise breaking resistor R13, capacitor C 2 opens circuit, steady resistance R14, stablize electric capacity C3, divider resistance R15, pre-resistor R16, upper end resistance R 17, Optical coupling resistance R18, emitter resistance R19, b electrode resistance R20, earth resistance R21, biasing voltage-stabiliser tube DW3, comparator IC2 opens circuit, optocoupler IC3, the triode Q3 that opens circuit, one end of the other end of breaking resistor R13 and the capacitor C 2 that opens circuit, positive input terminal+the IN of comparator IC2 of opening circuit holds connection, the other end ground connection of the capacitor C that opens circuit 2, one end of the other end of pre-resistor R16 and divider resistance R15, the negative electrode of biasing voltage-stabiliser tube DW3 connects, the plus earth of biasing voltage-stabiliser tube DW3, one end of the other end of divider resistance R15 and steady resistance R14, stablize one end of electric capacity C3 and negative input end-IN of the comparator IC2 that opens circuit holds connection, the other end ground connection of steady resistance R14, stablize the other end ground connection of electric capacity C3, the positive power source terminal of comparator IC2+V end that opens circuit is held and is connected with circuit positive power source terminal VCC, negative power end-the V of comparator IC2 of opening circuit holds ground connection, the output OUT end of the comparator IC2 that opens circuit and one end of upper end resistance R 17, one end of b electrode resistance R20 and breaking alarming output UB end connect, the other end of upper end resistance R 17 is connected with circuit positive power source terminal VCC end, the other end of b electrode resistance R20 is connected with the base stage b end of the triode Q3 that opens circuit, the other end of Optical coupling resistance R18 is connected with positive input terminal+IN end of optocoupler IC3, the negative input end of optocoupler IC3-IN end is connected with main power source negative terminal-E end, the emitter-base bandgap grading output e end ground connection of optocoupler IC3, the collector output c end of optocoupler IC3 and one end of emitter resistance R19, the emitter-base bandgap grading e end of triode Q3 of opening circuit connects, and the other end of emitter resistance R19 is connected with circuit positive power source terminal VCC end, and the collector electrode c of the triode Q3 that opens circuit holds and one end of earth resistance R21, the class that opens circuit type output terminal IO holds connection, the other end ground connection of earth resistance R21.

Used in the present inventionly comprise that all devices of light-operated metal-oxide-semiconductor U1, current sensor CS1, comparator IC1 and IC2, optocoupler IC3, triode Q1 and Q2 etc. all adopt existing matured product, can obtain by market.For example: light-operated metal-oxide-semiconductor adopts AQZ262, current sensor adopts CSM series Hall current sensor, and comparator adopts LM311, and optocoupler adopts 6N136, and triode adopts C8550 etc.

Main circuit parameter and input/output relation in the present invention are as follows:

The output signal U of current sensor CS1 in Fig. 1 _iwith tested current of electric I ₀relation as the formula (1), β be wherein current-voltage conversion coefficient (unit: V/A), U _i0current sensor output signal (unit: V) during for zero current.

U _i=U _i0+βI ₀ （1）

If: the voltage stabilizing value of overcurrent voltage-stabiliser tube DW2 is U _w2(unit: V), the voltage stabilizing value of biasing voltage-stabiliser tube DW3 is U _w3(unit: V).: the threshold value U of short circuit comparator _imas the formula (2), the open circuit threshold value U of comparator _ibas the formula (3), I wherein _0mfor short circuit current decision content (unit: A), I ₀₀for breaking current decision content (unit: A), I ₀₀depend primarily on the emission side electric current of optocoupler IC3.

$U_{\mathrm{im}}=\frac{R9}{R9+R10}{U}_{w2}=U_{i0}+{\mathrm{\βI}}_{0m}---\left(2\right)$

$U_{\mathrm{ib}}=\frac{R14}{R14+R15}{U}_{w3}=U_{i0}+{\mathrm{\βI}}_{00}---\left(3\right)$

Therefore, according to formula (2), (3), the parameter of the left end resistance R 9 of can adjusting, right-hand member resistance R 10, steady resistance R14, divider resistance R15, its relational expression is respectively suc as formula shown in (4), formula (5).

$\frac{R10}{R9}=\frac{U_{w2}}{U_{i0}+{\mathrm{\βI}}_{0m}}-1---\left(4\right)$

$\frac{R15}{R4}=\frac{U_{w3}}{U_{i0}+{\mathrm{\βI}}_{00}}-1---\left(5\right)$

In addition inductance L 1 and short-circuit resistance R12, short circuit capacitance C1, short circuit current decision content I, _0m, the matching relationship between main power voltage E as the formula (6).

$L1\≥\frac{3.3E}{I_{0m}}(R12\×C1)---\left(6\right)$

The course of work of the present invention is as follows:

(1) when the motor operation control signal UC from higher controller system is low level, drive triode Q1 cut-off, light-operated metal-oxide-semiconductor to end, motor M is not worked yet;

(2) when the motor operation control signal UC from higher controller system is high level, drive triode Q1 conducting, the also conducting of light-operated metal-oxide-semiconductor, now, motor M may have following three kinds of states:

1) motor M is normally moved.Now, short-circuit alarming signal US and breaking alarming signal UB are high level, that is: motor normally moves;

2) motor M is not moved, and short-circuit alarming signal US is low level.Show that electric motor loop is short-circuited or overload fault, when electric motor loop circuit reaches short circuit current decision content I _0mtime, short circuit comparator IC1 output OUT end is low level, thyristor VT1 conducting, driving triode Q1 and light-operated metal-oxide-semiconductor have been blocked, cut off the power supply to motor, simultaneously, because thyristor is half control type device, once after conducting, just can not turn-off because of the change of gate pole control signal, thus realized reliable short-circuit protection function;

3) motor M is not moved, and breaking alarming signal UB is low level.Show main circuit generation open circuit fault, while opening circuit because of main circuit, current sensor CS1 output signal drops to breaking current decision content, and comparator IC2 output low level alarming value causes opening circuit.In addition, because motor M is actually the production scene being installed on away from beyond control circuit, therefore, when there is open circuit fault and the type signal IO that opens circuit and be high level, show that this trip point occurs in motor side, otherwise, when there is open circuit fault and the type signal IO that opens circuit and be low level, showing that this trip point occurs in take light-operated metal-oxide-semiconductor and is main control circuit side, and this will, for getting rid of quickly open circuit fault, provide reliable and unique foundation.

Claims (3)

1. for Electric Machine Control and the multifunctional protection circuit of vibration-testing, comprise direct current machine running control circuit, short-circuit protection circuit, open circuit and detect and trip point decision circuitry, it is characterized in that:

Direct current machine running control circuit comprises negative supply capacitor C 5, positive supply capacitor C 6, current-limiting resistance R1, base resistance R2, input resistance R3, biasing resistor R4, thyristor VT1, light-operated metal-oxide-semiconductor U1, drive triode Q1, stop voltage-stabiliser tube DW1, inductance L 1, inductance diode D1, motor diode D2, motor M, current sensor CS1, main power source capacitor C 4, one end of negative supply capacitor C 5 is connected with circuit negative power end VSS end, the other end ground connection of negative supply capacitor C 5, one end of positive supply capacitor C 6 is connected with circuit positive power source terminal VCC end, the other end ground connection of positive supply capacitor C 6, one end of current-limiting resistance R1 is connected with circuit positive power source terminal VCC end, the other end of current-limiting resistance R1 is connected with positive input terminal+IN end of light-operated metal-oxide-semiconductor U1, the negative input end of light-operated metal-oxide-semiconductor U1-IN end is connected with driving the collector electrode c end of triode Q1, drive the emitter-base bandgap grading e end ground connection of triode Q1, drive the base stage b end of triode Q1 to be connected with one end of base resistance R2, the other end of base resistance R2 and the anodic bonding that stops voltage-stabiliser tube DW1, the one end that stops negative electrode and the input resistance R3 of voltage-stabiliser tube DW1, the anodic bonding of one end of biasing resistor R4 and thyristor VT1, the other end of biasing resistor R4 is connected with circuit negative power end VSS end, the minus earth of thyristor VT1, the other end of input resistance R3 and motor operation control end UC end, one end of pre-resistor R16 connects, positive output end+end of light-operated metal-oxide-semiconductor U1 and one end of inductance L 1, the anodic bonding of inductance diode D1, the negative electrode of the other end of inductance L 1 and inductance diode D1, the anode of main power source capacitor C 4 and main power source anode+E hold connection, the other end of main power source capacitor C 4 is connected with main power source negative terminal-E end, negative output terminal-end of light-operated metal-oxide-semiconductor U1 is one end A1 end through the detection Kong Houyu motor M of current sensor CS1 through line, the negative electrode of motor diode D2 and one end of Optical coupling resistance R18 connect, the other end A2 end of motor M is connected with main power source negative terminal-E end, the anode of motor diode D2 is connected with main power source negative terminal-E end, the positive power source terminal of current sensor CS1+V end is connected with circuit positive power source terminal VCC end, the negative power end of current sensor CS1-V end is connected with circuit negative power end VSS end, the ground end GND end ground connection of current sensor CS1, the output OUT end of current sensor CS1 and one end of short-circuit resistance R12, one end of breaking resistor R13 connects,

Short-circuit protection circuit comprises short-circuit resistance R12, short circuit capacitance C1, pressure limiting resistance R 11, left end resistance R 9, right-hand member resistance R 10, overcurrent voltage-stabiliser tube DW2, short circuit comparator IC1, pull-up resistor R8, drive resistance R 7, c electrode resistance R5, gate electrode resistance R6, short circuit triode Q2, one end of the other end of short-circuit resistance R12 and short circuit capacitance C1, negative input end-IN of short circuit comparator IC1 holds connection, the other end ground connection of short circuit capacitance C1, one end of the positive input terminal of short circuit comparator IC1+IN end and left end resistance R 9, one end of right-hand member resistance R 10 connects, the other end ground connection of left end resistance R 9, one end of the other end of right-hand member resistance R 10 and pressure limiting resistance R 11, the negative electrode of overcurrent voltage-stabiliser tube DW2 connects, the other end of pressure limiting resistance R 11 is connected with circuit positive power source terminal VCC end, the plus earth of overcurrent voltage-stabiliser tube DW2, the positive power source terminal of short circuit comparator IC1+V end is connected with circuit positive power source terminal VCC end, the negative power end of short circuit comparator IC1-V holds ground connection, the output OUT end of short circuit comparator IC1 and one end of pull-up resistor R8, drive one end and the short-circuit alarming output US end of resistance R 7 to connect, the other end of pull-up resistor R8 is connected with circuit positive power source terminal VCC end, drive the other end of resistance R 7 and the base stage b of short circuit triode Q2 end to be connected, the emitter-base bandgap grading e end of short circuit triode Q2 is connected with circuit positive power source terminal VCC end, the collector electrode c end of short circuit triode Q2 is connected with one end of c electrode resistance R5, the other end of c electrode resistance R5 and one end of gate electrode resistance R6, the gate pole of thyristor VT1 connects, the minus earth of thyristor VT1, the other end ground connection of gate electrode resistance R6,

Open circuit to detect with trip point decision circuitry and comprise breaking resistor R13, capacitor C 2 opens circuit, steady resistance R14, stablize electric capacity C3, divider resistance R15, pre-resistor R16, upper end resistance R 17, Optical coupling resistance R18, emitter resistance R19, b electrode resistance R20, earth resistance R21, biasing voltage-stabiliser tube DW3, comparator IC2 opens circuit, optocoupler IC3, the triode Q3 that opens circuit, one end of the other end of breaking resistor R13 and the capacitor C 2 that opens circuit, positive input terminal+the IN of comparator IC2 of opening circuit holds connection, the other end ground connection of the capacitor C that opens circuit 2, one end of the other end of pre-resistor R16 and divider resistance R15, the negative electrode of biasing voltage-stabiliser tube DW3 connects, the plus earth of biasing voltage-stabiliser tube DW3, one end of the other end of divider resistance R15 and steady resistance R14, stablize one end of electric capacity C3 and negative input end-IN of the comparator IC2 that opens circuit holds connection, the other end ground connection of steady resistance R14, stablize the other end ground connection of electric capacity C3, the positive power source terminal of comparator IC2+V end that opens circuit is held and is connected with circuit positive power source terminal VCC, negative power end-the V of comparator IC2 of opening circuit holds ground connection, the output OUT end of the comparator IC2 that opens circuit and one end of upper end resistance R 17, one end of b electrode resistance R20 and breaking alarming output UB end connect, the other end of upper end resistance R 17 is connected with circuit positive power source terminal VCC end, the other end of b electrode resistance R20 is connected with the base stage b end of the triode Q3 that opens circuit, the other end of Optical coupling resistance R18 is connected with positive input terminal+IN end of optocoupler IC3, the negative input end of optocoupler IC3-IN end is connected with main power source negative terminal-E end, the emitter-base bandgap grading output e end ground connection of optocoupler IC3, the collector output c end of optocoupler IC3 and one end of emitter resistance R19, the emitter-base bandgap grading e end of triode Q3 of opening circuit connects, and the other end of emitter resistance R19 is connected with circuit positive power source terminal VCC end, and the collector electrode c of the triode Q3 that opens circuit holds and one end of earth resistance R21, the class that opens circuit type output terminal IO holds connection, the other end ground connection of earth resistance R21.

2. the Electric Machine Control for vibration-testing as claimed in claim 1 and multifunctional protection circuit, is characterized in that:

The output signal U of current sensor CS1 _iwith tested current of electric I ₀relation as the formula (1), β be wherein current-voltage conversion coefficient (unit: V/A), U _i0current sensor output signal during for zero current (unit: V):

U _i=U _i0+βI ₀ （1）

If: the voltage stabilizing value of overcurrent voltage-stabiliser tube DW2 is U _w2(unit: V), the voltage stabilizing value of biasing voltage-stabiliser tube DW3 is U _w3(unit: V); : the threshold value U of short circuit comparator _imas the formula (2), the open circuit threshold value U of comparator _ibas the formula (3), I wherein _0mfor short circuit current decision content (unit: A), I ₀₀for breaking current decision content (unit: A), I ₀₀depend primarily on the emission side electric current of optocoupler IC3:

$U_{\mathrm{im}}=\frac{R9}{R9+R10}{U}_{w2}=U_{i0}+{\mathrm{\βI}}_{0m}---\left(2\right)$

$U_{\mathrm{ib}}=\frac{R14}{R14+R15}{U}_{w3}=U_{i0}+{\mathrm{\βI}}_{00}---\left(3\right)$

Therefore, according to formula (2), (3), the parameter of the left end resistance R 9 of can adjusting, right-hand member resistance R 10, steady resistance R14, divider resistance R15, its relational expression is respectively suc as formula shown in (4), formula (5):

$\frac{R10}{R9}=\frac{U_{w2}}{U_{i0}+{\mathrm{\βI}}_{0m}}-1---\left(4\right)$

$\frac{R15}{R4}=\frac{U_{w3}}{U_{i0}+{\mathrm{\βI}}_{00}}-1---\left(5\right)$

In addition inductance L 1 and short-circuit resistance R12, short circuit capacitance C1, short circuit current decision content I, _0m, the matching relationship between main power voltage E as the formula (6):

$L1\≥\frac{3.3E}{I_{0m}}(R12\×C1)---\left(6\right)$

3. the Electric Machine Control for vibration-testing as claimed in claim 1 and multifunctional protection circuit, is characterized in that:

Described light-operated metal-oxide-semiconductor U1, current sensor CS1, short circuit comparator IC1, the comparator IC2 that opens circuit, optocoupler IC3, driving triode Q1, short circuit triode Q2 all adopt existing matured product, light-operated metal-oxide-semiconductor adopts AQZ262, current sensor adopts CSM series Hall current sensor, short circuit comparator and the comparator that opens circuit adopt LM311, optocoupler adopts 6N136, drives triode and short circuit triode to adopt C8550.