Because servo electric machinery is long-term operation of the continuous person that use or use is undeserved, often can produce electric machinery breakdown, maintain relatively complex. Small the maintenance method that poses 13 kinds of when collected servo electric machinery to happen common breakdown problems, draw lessons from for everybody study.
One, what does the job that needs to do before starting servo electric machinery have
1) measure insulation resistance (do not answer to low voltage electric machinery under 0.5M) .
2) measure power source voltage, wiring of examination electric machinery is correct, whether does power source voltage accord with a requirement.
3) examination starting equipment is good.
4) examination fuse is appropriate.
5) ground connection of examination electric machinery, receive 0 good.
6) whether does examination gearing have drawback.
7) environment of examination electric machinery is appropriate, cleared and combustible taste and other is sundry.
2, what does the reason of overheat of bearing of servo electric machinery have
Electric machinery itself:
1) the outer lane inside bearing cooperates too close.
2) component form tolerancepublic errand has a problem, if the spare parts such as lid of baseplate, end, axis is coaxial,spend bad.
3) bearing is chosen undeserved.
4) bearing is lubricant undesirable or bearing cleans ungodliness, have inside grease sundry.
5) axial electric current.
Use respect:
1) aircrew installation is improper, coaxial spends the crankshaft that be like report and the rod that pull the device that use to add up to a requirement.
2) leather belt annulus is pulled had moved close.
3) bearing is safeguarded bad, grease is not worth or exceed operating period, send dry metamorphism.
3, what is the reason with lopsided electric current of three-phase of servo electric machinery
1) three-phase voltage is lopsided.
2) electric machinery is in-house some photograph spur track solders undesirable or the contact is bad.
3) electric machinery circles block to circle a short circuit or right alternate with short circuit.
4) wiring mistake.
4, how to control speed of speed of servo electric machinery
Servo electric machinery is system of feedback of a typical closed circuit, decelerate gear group by electric machinery drive, its terminal (output is carried) the scale potentiometer that drives a linear makes the position detect, this potentiometer feedbacks corner coordinate changeover to control circuit board for one scale voltage, control circuit board to compare the control pulse signal of its and input, generation corrects pulse, and drive electric machinery to or retrorse ground is rotational, make the output position of gear group and expectation are worth conform to, make correct pulse to tend for 0, achieve thereby make servo electric machinery accurate fixed position and calm fast purpose.
5, the rate that whether scintilla and scintilla produce between the carbon brush when observing electric machinery runs and commutator has repair
1, just have 2 ～ 4 dinky scintilla. Be like commutator surface is level off at this moment. Most circumstance can be not repaired surely;
2, it is flower of extremelying He Huo. Need not repair;
3, the dinky scintilla that has 4 above, and have 1 ～ 3 conflagration are beautiful, need not disassemble armature, need to grind carbon brush commutator with sand paper only;
4, if appear,the conflagration of 4 above is spent, need to grind commutator with sand paper, and must disassemble carbon brush and armature come down. Change carbon brush to grind carbon brush.
6, the rehabilitate of commutator
1, commutator surface is apparent the ground is rough whole (with the hand can touch) or the scintilla when electric machinery runs is like the 4th kind of circumstance. Need to disassemble right now armature, machine converter with accurate machine tool;
2, basic level, just have dinky bruise or scintilla, like mouth of L of the 2nd kind of circumstance 1 in order to use handiwork of waterproof abrasive paper abrade disassembling below the circumstance of armature abrade. Abrade order is: Press commutator first outside round radian, machine a ligneous tool, a few kinds the waterproof abrasive paper of different degree of finish cuts wide like commutator strip, get off carbon brush (notice to go up with carbon brush chamfer on the handle in the carbon brush that get off please make mark, the left and right sides is not sent to change a fault when security personnel is installed truly) stick solid commutator with the ligneous tool that wraps good sand paper, press electric machinery direction of rotation with another hand, gently commutator of axis of rotation is abrade. The order that servo electric machinery maintains degree of finish of use sand paper first thick hind fine cannot use foolishly when a piece of sand paper hind, change again additional fine sand paper, until gone the finest waterproof abrasive paper (or metallographic sand paper) .
7, coder of servo electric machinery is phasic as phasic as rotor magnetic pole how be opposite at 0 o'clock neat rehabilitate
1, of increment type coder phasic to neat means
What the UVW electron of the increment type coder that carries commutation signal changes photograph signal is phasic as phasic as rotor magnetic pole, or say electric angle is phasic pair of neat methods between as follows:
1) the UV winding that gives electric machinery with a direct current source is connected in order to be less than the dc of rated electric current, u is entered, v goes out, electric machinery axis directional balance the position to;
2) the U photograph signal that observes coder with oscillograph and Z signal;
3) the relative position that adjusts coder runner shaft and electric machinery axis;
4) adjust at the same time, observe coder U believes date jumps at the same time change along, with Z signal, go up in tall n till Z signal stability (here the normal of acquiescent Z signal is low n) , the lock decides the relative position of coder and electric machinery to concern;
5) turn round electric machinery axis back and forth, after letting go, when the crankshaft that be like report replies to balance the position freely every time, z signal can be stabilized go up in tall n, right neat effective.
2, of very form coder phasic to neat means
Of very form coder phasic much to be being mixed together to only group circle, the difference is not big, it is right inside circuit actually of neat coder detect phasic with angle of electric machinery report phasic. At present very practical method is the EEPROM that uses coder interior, memory coder is installed randomly in electric machinery axis of the actual measurement after going up phasic, specific means is as follows:
1) coder random installation is on electric machinery, originally namely knot coder runner shaft and electric crankshaft, and coder crust and electric machinery crust;
2) the UV winding that gives electric machinery with a direct current source is connected in order to be less than the dc of rated electric current, u is entered, v goes out, electric machinery axis directional balance the position to;
3) read the sheet that takes absolutely coder to encircle positional value with servo driver, in stocking coder interior to record the EEPROM of starting phase of angle of electric machinery report;
4) end to neat process.
8, change of maintenance of servo electric machinery uses an appearance
When feed occurrence change uses an appearance, measure fast signal to be not stabilized, if coder has terminal of crackle; wiring,contact undesirable, if bolt becomes loose,wait for; to be moved when change happen in by square to motion and the inverting instant that oppose directional motion when, as a result of,be commonly of feed drive catenary ask unoccupied place or servo drive gain is too big reversely be caused by.
9, servo electric machinery maintains creeping appearance
Happen in mostly start quickly paragraph or when low speed feed, because the lubricant position of feed drive catenary is bad,be commonly, servo gain is small reach adscititious load to wait for element be caused by greatly too. What want an attention especially is, the shaft coupling that servo electromotor and connection of ball guide screw use, become loose as a result of join or the blemish of shaft coupling itself, wait like crackle, create the rotational and different situation of ball guide screw and servo electromotor, make feed moves thereby ignore fast ignore slow.
10, servo electric machinery maintains oscillatory appearance
When machine tool high speed moves, the possibility arises vibration, flow too with respect to meeting generation at this moment call the police. Problem of machine tool vibration attributes rate problem commonly, should seek speed annulus issue so.
11, torsion of maintenance of servo electric machinery reduces a phenomenon
When servo electric machinery runs to high speed from rated locked-rotor torsion, discover torsion can be reduced suddenly, at this moment because of electromotor winding medicinal powder hot attaint and mechanical part are calorific those who cause. When high speed, electromotor temperature rise greatens, accordingly, checking computations must undertake to the load of electric machinery before using servo electric machinery correctly.
12, servo electric machinery maintains position error appearance
When servo axis motion exceeds positional allow when poor limits (KNDSD100 gives emblem mark to install PA17 definitely: 400, positional out of tolerance detects limits) , servo driver can appear " 4 " date place out of tolerance calls the police. Main reason has: The gain of servo of small; of allow poor limits of systematic set installs undeserved; position to detect device has error of accumulative total of chain of drive of contaminative; feed to wait greatly too.
13, maintenance of servo electric machinery does not turn phenomenon
Numerical control system arrives servo driver besides coupling pulse + outside directional signal, still have make can control signal, it is DC+24V relay commonly coil voltage. Servo electromotor does not turn, commonly used diagnostic method has: Whether does system of examination numerical control have pulse signal to output; examination to make can whether does signal put through; is inputted through system of observation of liquid crystal screen / the servo electromotor to electrified magnetism brake affirms the start condition; that gives condition to whether satisfy feed axis apply the brake has opened; driver to have breakdown; servo electromotor has.
