CN2476824Y - Automatic testing device for property of photoelectric coder and speedometer - Google Patents

Abstract

The utility model discloses a photoelectric encoder and a tachometer performance ATM which comprises a three-phase alternating-current supply, a miniwatt transducer, a mini alternating current dynamo, a standard coder, a flange catcher and JB, a data collecting card, a signal adjusting module and an industrial control computer. The device adopts a high speed A/D card and the computer enables the impulse coder to output an impulse signal collected in the way of analog quantity to achieve the high speed oscillograph function; the impulse coder outputs the mutual relation between the impulses, outputs a new coder performance ration testing method, and realizes the entire ration analysis towards the tested appliance performance index automatically.

Description

A kind of photoelectric encoder and tachometer performance automatic test device

The utility model belongs to electronic measuring technology field, is specifically related to the automatic testing equipment of a kind of photoimpact scrambler, tech-generator technical feature.

The technical indicator of pulse encoder has the slope of phase shift between the number, A, the pulse of B phase of zero pulse Z, A, the pulse of B phase, duty of ratio, rising edge of a pulse and negative edge.Prior art is directly to survey the output pulse waveform of pulse encoder with oscillograph, estimate the A of pulse encoder, the phase shift and the dutycycle of B pulse by the coordinate transform on the oscillograph, and its computation process is time-consuming, and error calculated is very big, can not measure A, B phase umber of pulse in addition.Chinese patent instructions CN-88105036 and CN-0102987.4 are disclosed to be to carry out shaping with the output pulse of signal conditioning circuit paired pulses scrambler, pass through rolling counters forward again, though can calculate umber of pulse, the phase shift of the dutycycle of paired pulses scrambler, A, the pulse of B phase and the difficult parameters such as slope of actual output pulse waveform rising edge and negative edge are to carry out quantitative test and calculating.The key technical indexes of tachometer has: ripple factor, the linearity, repeatability, method of testing commonly used at present is by oscillograph the output voltage waveforms of tachometer under a certain rotating speed directly to be shown, directly observation is superimposed upon the ripple voltage shape on the DC voltage, but is difficult to make the quantitative target analysis.Can only be for the linearity and repeatability by digital revmeter and voltage table point-to-point measurement.Manually calculate its real data, obviously calculated amount is big, and precision can not be guaranteed.

The purpose of this utility model is to provide a kind of precision height, photoelectric encoder and tachometer performance automatic test device that robustness is good, easy to operate.

The utility model hardware constitutes can be divided into the two large divisions: machine power platform and computer testing platform, and wherein the machine power mounting platform is mainly by AC power 1; Low power frequency conversion device 2; Micro ac motor 3; Standard coders 4 is suitable for dissimilar photoelectric encoders; Tech-generator flange catcher 5 and shaft joint are formed, and all kinds photoelectric encoder, tech-generator machinery mounting condition and test rotary power are provided.The computer testing platform is mainly by data collecting card 8 (super high-speed A/D card, low speed A/D card, the high-speed counter plate), equipment under test 6 (all kinds of tech-generators and pulse encoder), signal regulating panel 7, industrial control computer 9 is formed, and finishes functions such as signal condition, data acquisition, test data analysis-by-synthesis.

The technical solution of the utility model is achieved in that the three-phase alternating current output of low power frequency conversion device 2 inserts micro ac motor 3 by power cable with the three-phase alternating current input terminal of three-phase alternating-current supply 1 by power cable access low power frequency conversion device 2.In this device, micro ac motor 3 adopts dual-axle motor, and an end is installed a standard coders 4, realizes the accurate measurement of motor actual speed, and the other end connects equipment under test 6 (all kinds of tech-generators and pulse encoder) by mechanical flange catcher 5; The pulse encoder of different model and operating voltage output A mutually, B phase, the pulse of Z phase insert signal condition module 7 by five core signal cables and control gating, and its output inserts the data collecting card 8 (super high-speed A/D card) that is inserted in the computer bus groove; Standard coders 4 output A phases, B phase pulse signal insert the high-speed counting card by three core signal cables; The tech-generator output signal inserts low speed A/D card after inserting the low pass attenuator circuit by two core signal cables.Test process is as follows: earlier the nominal parameter of equipment under test 6 is imported computing machine 9, computing machine 9 provides speed setting value and enabled instruction for low power frequency conversion device 2, low power frequency conversion device 2 drives motor 3 rotations, the output pulse that is contained in pulse encoder on the motor shaft is by high-speed a/d card input computing machine 9, computing machine 9 reads zero pulse Z signal rising edge, record zero pulse number is I and corresponding coordinate, read for the second time the rising edge of zero pulse signal, record zero pulse number is II and corresponding coordinate, read the rising edge of zero pulse signal for the third time, record zero pulse number is III and corresponding coordinate, calculate then adjacent two zero pulses between interval time, as not waiting two interval times, show that then zero pulse loses, as equating that then zero pulse is normal interval time.Under the zero pulse normal condition, from first rising edge of zero pulse, recording the pulse of A phase is rising edge, A phase umber of pulse is designated as I, and writes down corresponding coordinate, records A phase pulse rising edge for the second time, A phase umber of pulse is designated as II, and write down corresponding coordinate, by that analogy, up to the Z pulse second rising edge appears, A phase umber of pulse is the actual measurement umber of pulse, B phase umber of pulse computing method are mutually identical with A, simultaneously, utilize A, B phase rising edge of a pulse coordinate to calculate the mutually interpulse phase shift of A, B respectively.Read A, B phase pulse signal, begin to finish to second rising edge from first rising edge, high level is counted and low level is counted computed duty cycle by adding up; Definition according to rising edge of a pulse, negative edge: pulse is from 10%U _e-90%U _eTime, therefore count by accumulative total [0.1Ue, 0.9Ue] interval rising edge and negative edge, calculate rise time and fall time by the sampling period, and then obtain rising edge and negative edge slope.

Because the utility model adopts the high-speed a/d card, by computing machine the pulse encoder output pulse signal is come in the form collection of analog quantity, realized the high-speed oscilloscope function, by mutual restriction relation between the pulse encoder output pulse, derive a kind of brand-new encoder performance quantitative measuring method---based on many group pulses information related constraint mensuration, the measured device performance index are made comprehensively quantitatively analysis-by-synthesis automatically.

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

Fig. 1 is a proving installation hardware structure diagram of the present utility model.

Fig. 2 is a multiple signals option board circuit diagram of the present utility model.

Among Fig. 1, connect by three core power cables between three-phase alternating-current supply 1 and the frequency converter 2; Connect by three core power cables between frequency converter 2 and the twin shaft micro ac motor 3; Fix by flange between twin shaft micro ac motor 3 and the standard coders 4, carry out mechanical connection by supporting shaft joint and install; Twin shaft micro ac motor 3 other ends are fixing by supporting Luo mother with flange catcher 5, shaft joint is connected; Flange is taken over 5 other ends and equipment under test 6 (pulse encoder, tech-generator) by supporting shaft joint mechanical connection, fix by the Luo select; Link to each other by signal shielding cable between equipment under test 6 (pulse encoder, tech-generator) and signal condition (signal regulating panel, the multiple signals option board) module 7; Connect by flat cable between 7 outputs of signal condition module and the data collecting card; Parallel bus connects in the trough by calculating between data collecting card 8 and the industrial computer 9; The D/A transformation result inserts low power frequency conversion device 2 simulate given input channels by two core signal shielding cables and realizes that the computing machine auto-speed is given in the data collecting card 8.

Proving installation hardware is integrated in respectively in two cabinets, mechanical installing platform: AC power 1; 1KW low power frequency conversion device 2; 0.75KW, 3000rpm twin shaft micro ac motor; Standard coders 4,1024, A phase, B phase, Z export mutually, are suitable for dissimilar pulse encoders, tech-generator, flange catcher 5; According to measured device model, the supporting design of size and shaft joint, provide all kinds pulse encoder, tech-generator machinery mounting condition and test rotary power; Be convenient test, dual-axle motor is vertically installed that flange catcher 5 fixedly Luo select is positioned at cabinet upper surface platform, the weight of measured device is added on the flange of cabinet surface fully, the influence of measured device weight and make the neat standard of test platform when avoiding the level installation; The computer testing cabinet is mainly by data collecting card 8 (super high-speed A/D card, 20MHZ sample frequency, 16KRAM, 4 passages; Low speed A/D card, 100KHZ sample frequency, two passages, both-end input; The high-speed counter plate, 4 path 10 0KHZ count frequencies), signal condition module 7, industrial control computer 9 (10G hard disk, 64MRAM, Windows98 operating system,, VB or VC ⁺⁺Programming with Pascal Language) forms, finish functions such as signal condition, data acquisition, test data analysis-by-synthesis, can adopt standard industry control rack.

Among Fig. 2,157 (U1 and U2) are four alternative data selectors, and 40D (X1, X2) is 40 core flat cable sockets, and 20D (DO, DI) is 20 core flat cable sockets, and 37D is 37 core signal cable sockets, and Q9 (J1, J2, J3, J4) is a Q9 type socket.Its major function is to realize the selection of multiple signals and the conversion of connection terminal, and purpose is the needs that meet high-speed counter card, digital quantity I/O card and super high-speed A/D card input reference signal for the pulse signal (24V or 5V) that makes pulse encoder output in front on the basis of signal regulating panel.Principle of work is: the pulse signal that modulated reason is crossed is delivered to 157 (U1, U2) through X1, X2, for example the A of the 24V signal correspondence 157 before the conditioning holds, the B end of 5V correspondence 157, computing machine sends control command according to signal type by DO, select respective signal, give counter through 37D and stick into the row counting, give super high-speed A/D card through Q9 type socket.In addition, this plate can also utilize 20 core flat cables to link to each other with digital quantity I/O card in the computing machine by DO, DI as the terminal board of digital quantity I/O.

Claims (2)

1, a kind of photoelectric encoder and tachometer performance automatic test device comprise machine power platform and computer testing platform, and wherein the machine power mounting platform comprises: three-phase alternating-current supply (1); Low power frequency conversion device (2); Micro ac motor (3); Standard coders (4) is suitable for dissimilar photoelectric encoders; Tech-generator flange catcher (5) and shaft joint provide all kinds photoelectric encoder, tech-generator machinery mounting condition and test rotary power; The computer testing platform comprises: data collecting card (8) (super high-speed A/D card, low speed A/D card, high-speed counter plate); Signal condition module (7); Industrial control computer (9), it is characterized in that: the three-phase alternating current input terminal that three-phase alternating-current supply (1) is inserted low power frequency conversion device (2) by power cable, the three-phase alternating current output of low power frequency conversion device (2) inserts micro ac motor (3) by power cable, micro ac motor (3) one ends are installed a full sized pules scrambler (4), the other end connects equipment under test (6) by mechanical flange catcher (5), equipment under test can be pulse encoder or tech-generator, pulse encoder output A phase, the B phase, the pulse of Z phase inserts the pulse signal modulate circuit by five core signal cables, and output signal inserts the high-speed a/d card that is inserted in the computer bus groove; Standard coders (4) output A phase, B phase pulse signal insert the high-speed counting card by three core signal cables; The tech-generator output signal inserts low speed A/D transition card after inserting the low pass attenuator circuit by two core signal cables.

2, described a kind of photoelectric encoder of claim 1 and tachometer performance automatic test device, it is characterized by: adopt 157 4 alternative data selectors to select then switch, make the 24V of pulse encoder output or the 5V signal meets high-speed counter card, digital quantity I/O card and super high-speed A/D card input reference signal through conditioning needs as the multiple signals passage; Adopt 40 core flat cable sockets, 37 core signal cable sockets and Q9 type socket, the signal of front signal regulating panel output is connected on 37 core signal cable sockets and the Q9 type socket through 40 core flat cables, link to each other with super high-speed A/D card with the high-speed counter card with two core signal cables through 37 core signal cables again, realize the conversion of signal terminal.