The cause and mitigation method of the vertical mixer motor burn

Motor in operation to avoid burning, in addition to the operation to take the necessary technical protection measures, effective and practical prevention methods are to carry out the correct technical maintenance.
motor burn-out is mainly caused by power supply, motor itself, load, ventilation and heat dissipation and other abnormalities.
The problem of burning motor, whether the motor burned out to make the following steps: First: electricity opportunity is very hot, open the wiring box, there will be a very pungent taste, unbearable, but can not prove that the motor burned, there is also the possibility of high temperature burning.
2: Measure the three-phase resistance with a mass meter to see if the three-phase resistance value is balanced, if the three-phase resistance is not balanced, indicating that the motor is abnormal, for the larger capacity of the motor, measuring DC resistance, you can use a bridge to measure.
3: Shake the resistance of one of the phases to the ground line or the base with a mega-European watch, and if the resistance is zero or the resistance is less than 0.5 mega ohms, the motor insulation is faulty or burned.
the above three points, it is basically 1000 can determine whether the motor burned.
the motors that are usually burned during user use are: overload, single phase, lack of phase, intersting.
mitigation method 1, check the temperature of the motor to often check the motor bearings, sstations, housings and other parts of the temperature changes, especially for no voltage, current and frequency monitoring and no overload protection of the motor, the monitoring of temperature rise is more important.
motor bearings are overheated and short of oil, if the temperature rise near the bearings is found to be too high, it should be stopped immediately to check.
the rolling body of the bearing, whether there are cracks, scratches or defects on the surface of the track, whether the bearing gap is too large to shake, whether the inner ring has rotation on the shaft, etc.
any of these phenomena, the bearings must be updated before they can be re-run.
2, to keep the motor often in the rated current operating motor overload operation, mainly due to the drag load is too large, voltage is too low, or driven by mechanical stuck.
if the overload time is too long, the motor will absorb a large amount of power from the grid, the current will increase sharply, the temperature will also rise, at high temperatures the insulation of the motor will age and burn.
3, often keep the motor clean, the motor in operation, at least 3 meters around the air in the air in the air port is not allowed to have dust, water stains and other debris, to prevent the inside of the suction motor, the formation of a short-circuit media, or damage to the wire insulation, resulting in a short circuit between the boxes, increased current, temperature and burned the motor.
, to ensure that the motor has sufficient insulation resistance, as well as a good ventilation and cooling environment, in order to make the motor in a long period of operation to maintain a safe and stable working state.
4, observe the motor vibration, noise and abnormal odor motor vibration, will cause the load part connected with it different heart degree increase, the formation of motor load increase, overload operation, will burn the motor.
Therefore, the motor in operation, especially high-power motors should often check whether the foot bolts, motor end caps, bearing caps, etc. are loose, whether the grounding device is reliable, found that the problem is solved in a timely manner.
noise field sound and odor is the motor abnormal operation, followed by a serious failure of the precursor, at any time to find out the cause and eliminate.
5, to ensure the normal operation of the start-up equipment motor start-up equipment technical status, the normal start-up of the motor plays a decisive role.
practice has proved that the vast majority of burned motors, the cause is mostly due to the abnormal operation of start-up equipment.
such as the start-up equipment lack of phase start, contactor contacts pull arc, fire, etc.
start-up equipment is mainly clean and fastened.
If the contactor contact contacts are not clean will increase the contact resistance, causing heat to burn the contacts, resulting in a lack of phase and burning the motor, the contactor suction coil of the core rust and dust accumulation, will make the coil suction is not strict, and a strong noise, increase the coil current, burn the coil and cause failure.
6, often check whether the motor three-phase current balance three-phase asynchronous motor, its three-phase current any one-phase current and other two-phase current average difference is not allowed to exceed 10%, so as to ensure the safe operation of the motor.