What does smoke from machine tool motors have to do with it

Smoke from the motor is generally caused by the following reasons:

1) Stator winding short circuit or grounding.

2) The rotor winding joint is loose.

3) The transmission tape is too tight.

4) Sweeping. If the stator and rotor windings are faulty, they should be paddled with insulating paper at the short circuit and grounding point, and brushed with insulating paint or connected to the loose joints to confirm that the fault has been eliminated before it can be put into trial operation; If the tape is too tight, it can be relaxed appropriately to eliminate excessive tension; Sweep failure is generally caused by a change in the position of the end cover bearing, etc., which causes the rotor to shift. The air gap between the stator and the rotor should be measured and adjusted, and if it does not work, the relevant parts should be replaced.

The time to deal with the smoke fault of the motor is generally longer, and in most cases it is necessary to disassemble the motor for internal inspection, and the treatment of the smoke fault must be completely and thoroughly, and there shall be no hidden dangers.

First, your motor is three-way electric or two-box electric The three-electric is the lack of phase of your motor and the collar is burned out, and the two-phase motor is the coil is broken.

1. Is the motor overloaded? --Insulation overheating and aging, and eventually breakdown, short circuit, and burning. Overload can be mechanical or motor bearings.

2. Lack of phase of power supply -- current imbalance, two-phase overcurrent heating, burning the motor.

3. Insulation damage -- or a line needs to be connected This phenomenon will also occur.

poor ventilation; excessive load; Bearing locking; Phase-out operation.

Lack of phase, overload, and bearing damage cause the motor to sweep the bore and the rotor to bite to death, which will lead to the motor smoke and burning. Machine tool motor working forward rotation, reverse braking state, AC contactor current should be appropriately selected larger, otherwise due to frequent starting, reverse braking caused by AC contactor contact burnout and lack of phase, the cable is too small will also cause core loss of phase, motor binding post wiring should be applied to the corresponding copper buckle crimping and soldering, with tape or heat shrinkable tube for insulation and then connected, which will avoid wire breakage and cause phase loss. The level is limited, and the class has an axe.

The bearing part heats up.

The lack of oil in the bearing, the friction between the inner ring of the bearing and the bearing cover, or the tight fit between the bearing and the bearing sleeve can make the bearing part heat and smoke. That.

The phenomenon is that the bearing balls, inner and outer rings are discolored and blackened, the grease is discolored or burned out, and the bearing sleeve is deformed.

The stator and rotor rub against each other.

Due to improper handling of the manufacturing process, the fit between the base and the end cover is too loose, the bearing is worn too much, or the inner circle of the stator and the outer circle of the rotor itself are deviated.

Heart, can cause Dingyu and rotor phase friction, wear is more serious, not only grinding smoke in the place, but also can wear out the winding.

insulation, causing short circuits and ground faults.

3.The load is overloaded, the voltage is too low, or the three-phase voltage difference is too large.

The load of the motor exceeds the rated capacity or the voltage is too low, so that the three-phase current increases at the same time, the coil temperature rises, and the electricity is in serious condition.

The machine may be so hot that it is smoking. The three-phase voltage is unbalanced, which can also cause the motor to overheat and smoke. But the smoke of the motor coil immediately complete.

There are not many opportunities for burnout, but the insulation of the motor coil will be damaged to varying degrees, and it can generally be used.

4.The power supply is disconnected.

When the motor is running, if one phase of the three-phase power supply is interrupted, the motor can still continue to run. In the case of Y-wiring motors, there is a two-phase electricity.

The current increases, and there is no current in the one-phase winding that is de-energized. Pair the wiring motor. For example, there is a phase where the current increases, and the motor has a humming sound. This.

The greater the load, the more likely it is to smoke in a short period of time, and the motor will often burn out.

The situation of smoke in the motor is more terrible, because the smoke is easily reminiscent of the internal components of the motor may have been burned, and even the motor ** may occur. When dealing with this fault, motor maintenance personnel must check from multiple angles.

Clause.

1. Check whether the internal components of the motor are covered with dust

This is because dust accumulates to a certain extent and energizes it, which can lead to a short circuit inside the motor, and the components inside will be damaged. In many cases, if the motor is smoked due to dust accumulation, then the motor at this time has basically been burned, and if you can continue to use it after opening the motor housing, you only need to replace the damaged components. If there is no repair value, simply replace the old motor from the equipment.

Clause.

Second, the instability of the power supply voltage will also lead to smoke

The probability of this happening is generally not too high. Because each motor will clearly indicate on the nameplate how much voltage the motor needs to be connected to when it leaves the factory. However, it cannot be ruled out that the power supply is artificially connected indiscriminately, so that the power supply voltage is far lower than the rated working voltage of the motor, and the motor rotates irregularly in the case of unstable electrical phase, so the motor must be connected to the correct power supply voltage.

If the motor emits white smoke, it may be the above reasons, if you can't solve it yourself, you must find a professional motor repairer.

It may be that the coil in the motor is not connected properly, and the current is large when starting, so go to the maintenance office to check it.

Here's why:

1. The power supply voltage is too high, so that the magnetic circuit is saturated, and the power supply should be restored to normal value or within the allowable fluctuation range.

2. If the motor starts frequently or rotates too many times forwards and reverses, the number of starts and forwards and reversions should be reduced or the appropriate motor should be replaced.

3. If the fan is faulty and the ventilation is poor, the fan should be repaired or replaced.

Test the current when the load is big to see how big the current is generally two reasons There are two reasons for the short circuit between turns of the motor and the other is that the motor is a little stuck.

If it is burned, it may also be due to a short circuit due to poor quality.

The winding is short-circuited, the motor should be overhauled, and then the mechanical part should be checked

The motor burns out, the coil is short-circuited, or the load is too high.

Close the gate and check the reason for the power failure. Troubleshooting.

1.The power supply voltage is over, so that the core magnetic flux density is oversaturated, resulting in the temperature rise of the motor: if the power supply voltage exceeds a lot, it should be solved with the power supply department.

2.The power supply voltage is too low, and the temperature rise of the motor is too high under the rated load: if it is caused by the voltage drop of the power line is too large, the thicker power cord can be replaced; If the power supply voltage is too low, you can contact the power supply department to increase the power supply voltage.

3.When the wire is burned, the core is burned, so that the iron consumption increases: do the core inspection test, overhaul the core, and eliminate the fault.

4.Stator and rotor cores rub each other: check the cause of the failure If the bearing clearance exceeds the limit, the new bearing should be replaced, if the shaft is bent, it needs to be investigated and treated, and the core should be treated when the core is loose or deformed to eliminate the fault.

5.The surface of the winding is covered with dirt or foreign matter, which affects the heat dissipation of the motor: clean or clean the motor, and make the motor ventilation ditch unblocked.

6.The geared motor is overloaded or the drag of the production machinery resistance is too large, so that the motor heats up: eliminate the drag mechanical fault, reduce the resistance, according to the current indication, if the rated current is exceeded, the load needs to be reduced, and the larger capacity motor is replaced or the capacity increase measures are taken.

Reasons for smoke and burnout of the grinding mill motor:

Causes of motor burnout:

1. The motor runs out of phase

When the motor is running in a phase loss (the phenomenon of any phase disconnection in the three-phase winding is called phase loss), the vibration of the motor will become larger, abnormal sound will appear, the speed will drop and the current will increase, and the temperature rise of the electric lead banquet machine will rise sharply, resulting in the motor burning out. Open the burned out motor to check the stator windings, part of the winding turns black.

2. Long-term overload operation

Due to the long-term overload or overheating operation of the motor, the stator winding insulation aging will be accelerated, and the carbonization of the weakest point of the insulation will cause the winding to be short-circuited between turns, phase-to-phase short circuit or short circuit to the ground, etc., and the motor winding will be partially burned. Open the burned out motor and check the stator windings, all the windings turn black.

3. Causes of mechanical failure:

The motor bearing is damaged, the rotor is unbalanced or the connected pump is vibrate, the coupling connection is unbalanced, etc., resulting in the motor vibration value exceeding the standard, which causes the motor winding to loosen between turns, insulation cracks and other undesirable phenomena, the damage effect continues to accumulate, the thermal expansion and cold contraction make the insulation wear and tear, accelerate the insulation aging, and eventually lead to the first carbonized insulation damage until the motor is burned. Turn on the burned out motor to check the windings, one set of windings is out of phase or short circuit between turns, but the windings will not change color.

4. The motor burns out due to the residual rotation of the plugging

The motor bearing is completely damaged and cannot rotate to lock the motor shaft, or the mechanical equipment dragged by the motor is stuck, resulting in the motor stalling, resulting in a large locked-rotor current of the motor, which causes the motor winding temperature rise sharply and burns out the motor. Open the burned out motor and check the stator windings, all the windings turn black.

5. The motor is burned out due to the reduction of motor insulation due to other reasons

If the protection level of the motor does not meet the requirements or the sealing is not good during assembly, the motor is more susceptible to the immersion and dispersion of salt spray moisture, resulting in the decline of insulation and breakdown, resulting in inter-turn short circuit, phase short circuit or grounding short circuit and burn out the motor. The air inlet of the motor cooling fan is blocked by foreign objects, the ventilation is not smooth or the motor shell is oily, etc., resulting in uneven heat dissipation or poor heat dissipation of the motor, which causes the motor to overheat and the motor winding insulation to age for a long time, until the motor burns out. Bearing damage or running sleeve and other reasons will cause the motor to burn out.