Always magnetic belt synchro motor direct torque control system

0 - preface

Synchro motor because of having power factor higher -, run - timeefficiency higher -, stability good, the revolving speed Heng settles to wait a merit, is extensively been applied to industrial production amid.The startingfault that acquaints with synchro motor, and debugging in time, all have important meaning to the motor and the production systemses.By wayof energy in time, accurate debugging and transaction fault, have tovsthefamiliar fault progress of the synchro motor in detail analytical!

1 - Familiar fault

1.1- The synchro motor after switching on electricity the incapability starts

     The synchro motor after starting the incapability run - time generally has the reason of severals as follows:

(1) Power supply voltage over low.Because at the square of voltage, the starting torque direct proportion of synchro motor's the voltage of power supply over make low the starting torque of synchro motor significantly the droop is lower than load troque, can not start thus and want to raise vs this power supply voltage to enlarge the starting torque of dynamo.

(2) The fault of motor.Check motor settle, the rotor winding had no short circuit, open circtui, open soldering and link bad etc. fault, these the faults will make the dynamo can not start to create starting of rating of intensity of magnetic field, make thus the dynamo can not start;Checking the motor bearing has already had no failure, the port cap has have no loose, if bearing failure port shroud loose, result in bearing's down sinking, mutually rub with stator iron core, result in thus dynamo's canning not start, vs settle the rotor fault can be shaken table with the low tension, gradually click to check to seek a fault condition and adopt homologous treatment;The countersgaft accepts and carries to shroud a loose condition and all wants a pan car before driving each time and sees motor rotor whether slewing is vivid, if bearing or shaft kiowatt damage and replace in time.

(3) The control device breaks down.This kind of faults are mostly the d.c. output voltage of the windings of Li magnetic belt to adjust not appropriate or don't output, result in the stator current of motor over big, cause the motor conduct electricity the run make or the losing of dynamo magnetic belt run - time.Should check whether output voltage current and its waveform that the Li magnetic belt equips is normal at this time, the Rong breaks whether the machine Rong breaks, the contact is bad;Whether circuit board plug-in puts prison or alignment;Check loop resistance, put out whether crystal gate tube of magnet burns out or brokes through.

(4) Mechanical trouble.Such as be dragged along a dynamic machinery to block, result in motor incapability's starting, the rotor that moves motor in response to the pan at this time sees whether the slewing is vivid, machinery burden whether existence fault

1.2- The synchro motor incapability leads long into synchronization.

    Synchro motor in common use law of nonsynchronous starting, throw in Li magnetic belt when the motor rotor revolving speed hits synchronous revolving speed of 95%, make it leads long into synchronization.The synchro motor incapability leads long into synchronous reason as follows:

(1) The Li magnetic belt winding short circuit.Because the winding of Li magnetic belt, existence short circuit breaks down, as a result makes motor able to stabilize run - time but incapability and lead long into synchronization while being lower than synchronous revolving speed.Check to seek the Li magnetic belt winding short circuit, can open into low - tension(about the 30 Vs) in the rotor derivation on - line, put on the magnetic poles surface with a hand work steel saw, pursue inspection magnetic poles, if vibrating is violent, explain the magnetic poles to have no short circuit on steel saw of the magnetic poles' surface, if the vibrating of saw blade micro or don't flap, explain the magnetic poles short circuit.After unloading the magnetic poles, check the fault to click, is short-circuit degree, adopt local to mend or re- round to make.

(2) Power supply voltage over low.Power supply voltage over low, result in the strong Li link of the device of Li magnetic belt incapability working, make the motor incapability lead long into synchronization thus, the concrete way is to raise power supply voltage appropriately.

(3) The fault of Li magnetic belt device.Such as throw Li over speedy(namely throw in Li magnetic belt, motor rotor revolving speed over low), will make the motor can not lead long into synchronization, should check to throw if the Li link exists fault at this time.If Li magnetic belt device fault, the output's current is lower than a rating value, cause the electricity magnetic troque of dynamo over small but can not lead long into synchronization, at this time in response to scrutiny Li magnetic belt device of throw Li link and phase - shifting link, waveform use oscillograph to check to throw Li link and phase - shifting link, should also check and put out magnetic belt link and put out crystal gate of magnetic belt whether tube discovers a question as usual, handle in time, if the incapability handles in time, by way of the energy quickly restore capacity, should replace to provide for use circuit board.

1.3- Brush and compress tightly spring and gather to give or get an electric shock ring fault.

The brush leads short and compresses tightly spring press scarcity and make brush and gather to give or get an electric shock ring of indirectly touch badly, thus generate spark or arc electric, arc electric or spark to on the other hand and easily spark short circuit, will make arc electric burn on the other hand shorter, spark open circtui thus, result in Li magnetic belt device only the Li magnetoelectricity press but have no Li magnetoelectricity streaming;Compress tightly spring ageing lapse, make brush and gather to give or get an electric shock ring of indirectly touch badly, effect the starting of motor thus;Gather to give or get an electric shock a ring surface to there is grease stain and scar or slot scar, will make brush and gather to give or get an electric shock ring of indirectly touch badly, generate spark, spark further burn gather to give or get an electric shock ring, will also make gnd short-circuit, the spark effects the starting of motor thus.For gather to give or get an electric shock ring superficial grease stain, can wipe to clean with the acetone; For thin trace, use many fettle shagging rings of sandpapers surface, is ring surface roughness to hit R1.6 ums, if the slot scar obviously needs to get on the car bed transform, truning, enter amount of knife to take every time 1 mm as proper, in the 1-1.5 ms/s, the truning speed control's roughness hits of the ums of R1.5-1.8 and becomes bad anti to finally polish with the sandpaper 2-3 times over the 0.05 mms.

1.4- The damper winding breaks down.

The damper winding of synchro motor rotor is provided for synchro motor starting to use and wipe - out run - time at the same time amid spark because of loading to change of out of step osc.Start the damper winding in the process to incise the magnetic field of stator revolution but induced very big starting current in the synchro motor, so the big current by all means will result in damping hair thermal expansion, under the normal condition because of starting time short, the damper winding starting is behind soon will cool off, but block up revolution in the motor, lack phase, start the super - in time to lengthways wait a condition down, if don't shut down in time, will result in the damping take off soldering to split etc. condition.The damper winding is weaker link in the synchro motor parts, the damper winding familiar fault has:The damping takes off soldering and split, the damping ring discharges wildfire, damping ring the strain is serious.These faults will effect the starting of synchro motor. The damping takes off soldering and chooses silver actinium welding rod and adopts oxyacetylene welding to weld, the dynamo after taking out the core heats into rotor 200 Celsius degrees set rotor vertical in the oven, after taking out and adopt 750 Celsius degrees to or soly weld temperature, damping and the blind side of of damping ring complete solderings are full, clear a soldering dirt again, ;For split of the damping , after dismantling original damping, choose the material of material homology and adopt the above-mentioned method to weld after packing good damping.Damping ring the wildfire is mainly what damping ring indirectly touches bad or get in touch with area isn't enough to result in. Damping ring the strain seriously is mainly a damping to fix anticoincidence in the slot, the damping plugs into damping ring while welding hole falsely, appear additional stress after welding, at plus damping ring intensity not enough to, treatment is loose open all connectivity bolts of damping rings, vs strain anti big of damping ring, after oxyacetylene welding heating adjust with the exclusive use fixture even, vs strain serious replace a new damping of ring.

2 - The solid instance is analytical

Solid instance 1 a synchro motor adopt nonsynchronous starting law, invest Li magnetoelectricity streaming post - but hard lead long into synchronization.

Aim at the above-mentioned condition, halt after, check first whether power supply voltage is normal, then make use of multimeter and oscillograph vs the Li magnetic belt device scrutiny, the Li magnetoelectricity presses, whether current is normal, end is doubt a short-circuit of the winding of Li magnetic belt to, .Press the preceding paragraphs the method for giving, can open into low - tension in the rotor derivation on - line(about 30 Vs) ，put on the magnetic poles surface with a hand work steel saw, pursue an inspection magnetic poles, discover the vibrating of saw blade micro or don't flap and explain the magnetic poles' short circuit.After unloading the magnetic poles, use to shake a table inspection, recognize the magnetic poles winding's short circuit.Is further to check, discover depend outside layer of the 2 F wire full circle insulated failure, put coil in the oven to heat into 150 Celsius degrees, make wire full circle the insulated anneals and lightly start to pry short-circuit section actinium row, use after the 0.03 mms the ring oxidizing glass cloth board packing sheet to go into, again brush 1 F 1032 paint after, put at the oven near roast dry, finally brush the 1 F 183# insulated lacquer, install magnetic poles.The dynamo after assembling the starting leads long into synchronization smoothly.

Solid instance 2 some plant when a synchro motor start choked to death because of the machinery, start the super - in time to grow, don't park the car in time, again starting, the damping ring discharges.

Aim at the above-mentioned condition, open a dynamo port box, check damping ring to become a "S" shape, damping and damping ring having take off soldering.The reason is analytical:The dynamo divides six most solid magnetic poleses and starts because of the multifarious heavy load and once appeared damping to take off soldering and split before, the damping ring transforms serious fault, adopted to repair soldering, damping replaced to split, replaced measures like damping ring,etc.If this adopts same transaction measure, the fault cans not get thoroughly removal. In consideration of the damping's ring is whole type structure, the big current expanded severity because of heat rum while flowing, but solid magnetic poles again start only surface of magnetic belt Xue have fever and expand smaller, with of damping ring because of expand the degree is different, spark two of displacement with opposite creation and thermal stress, cause damping ring serious and take off faults like soldering,etc, .For overcoming this kind of bug, this carries on a remould to the damping's ring and cut into damping ring all 6-like in shape rings, in each ring both ends drilling one more a link a composition segment type damping ring, can wipe - out the internal stress and thermal stress that whole damping ring generates like this.

3 – Conclusion

When the synchro motor appears fault, cautiously analytical possible reason, gradually expel, look into related data when it's necessary, absorb experience, propose corrective actions.Analytical the dynamo fault not only need to have firm theory knowledge and experience of prolific maintenance repairs, but also need to aim at concrete fault, deep consideration, brave creative, the dynamo after ensuring to break down removal can stabilize run - time over a long period of time.