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Seven items to be supervised in the operation of agricultural electric motors
Source: China Bearing Network Time: 2013-05-28
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First, the temperature rise of the motor. The temperature rise of the motor refers to the difference between the operating temperature of the motor and the ambient temperature. Each motor has a personal temperature rise limit. Some motors indicate the temperature rise limit on the nameplate; Indicates the grade of the insulating material used. The limit operating temperature for the various insulation materials of the motor is as follows: Y; 90 ° C, A; 105 ° C, E; 120 ° C, B; 130 ° C, F; 155 ° C, H; 180 ° C, C; 180 ° C or above. Agricultural motor usually uses Class B insulation material; the temperature rise allowed is 75 ° C. The temperature rise during motor operation should not exceed the limit agreed on the motor nameplate. The temperature rise in the motor operation is to supervise the motor operation. Direct and reliable method. Currently in the countryside; on-site monitoring of motor temperature is mostly experienced by hand; the hand touches the case and feels hot; but the sustainable contact moment is short; and the temperature does not rise any more; Immediately retracted; and the small drops drip up to announce the "silk" sound; immediately transpiration; the motor can be overheated. Should stop; find out the cause of overheating; The voltmeter, ammeter and overload protection equipment are installed on the line; it is also the primary method for supervising the temperature rise.
Second, the motor's movement, oscillation and smell during operation. When the agricultural motor is in normal operation; the announced movement is stable, light and uniform; it makes people feel the feeling of "machine music"; no smell of insulating paint and burnt smell If it is an abnormal movement (screaming, boring, conflict, etc.); violent oscillation; insulating paint burnt smell (usually the burnt smell is announced when the agricultural motor insulation is grilled; at this moment, if you touch the motor by hand; feel Tricky. Oil burnt is usually the lack of oil in the bearing; in the near dry grinding; the bearing temperature rises; the odor of the oil and gas is transpiration. At this moment, the hand touches the bearing part; feels troublesome; etc.; clarifies that the motor is overheated or has other problems.
Third, the operation of the motor. The current value of the current motor when operating in the extra working state is called the additional current of the motor. Usually marked on the nameplate of the motor. Under normal conditions; the practice current should not exceed the extra value on the nameplate. Should pay attention to whether the three-phase current can be balanced; the current difference between the two phases should not be greater than 10% of the additional current; otherwise, the motor is faulty. Unique attention should be paid to whether there is a lack of phase operation; because the query indicates the cause of the burning of the agricultural motor 85% are due to lack of phase operation. Therefore, it is necessary to have a lack of phase protection; together; for a larger capacity motor, an ammeter should be installed to supervise the operating current; the agricultural motor usually has a larger capacity than the child.å—½ 媸 媸 媸 们 缌鞅è¿é¥¬ 缌鞅è¿é¥¬ 缌鞅è¿é¥¬ 缌鞅è¿é¥¬ 缌鞅è¿é¥¬ 缌鞅è¿é¥¬ 缌鞅è¿é¥¬ 缌鞅è¿é¥¬ 缌鞅è¿é¥¬
Fourth, the power supply voltage. The voltage of the motor when operating under additional operating conditions is called extra voltage. The actual operating voltage of the demanding motor should not change beyond 10% of the extra voltage; that is, the motor with an additional voltage of 380V; The practice voltage should be between 242 and 418V; if it is lower than 242V; the load operation can be appropriately reduced. Otherwise; the motor should stop the operation. Together; the three-phase voltage should be symmetrical; the imbalance should not be too large. Usually; the two-phase voltage The difference should not exceed 5%; otherwise, the temperature of the motor will rise too high; shorten the service life of the motor; or even burn it. The motor power supply is best equipped with a voltmeter and a transfer switch to directly supervise the actual operating voltage of the motor.
5. The working condition of the fuse or fuse. The fuse or fuse is the short-circuit protection device of the motor. The agricultural motor is blown by one-phase fuse or fuse in practice; when the motor is burned due to the lack of phase operation There is an attack. Therefore; should pay attention to whether there is a phase fuse fuse; the unique is the motor operated by the knife; more often, the fuse should be viewed together; when selecting the melt for the small agricultural motor; The fuse current of the fuse analyzed in the usual electrician book is slightly larger than 1.5 to 3 times of the additional current of the motor. This is because the reliability of the small current melt is poor; if the current of the melt is selected. The 嬖è°å¹Œå—³åŽ¶ 鄱 è´¾ ç¼ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡 赡.
Sixth, the operation status of the transmission equipment. Always pay attention to whether the pulley or the coupling can be loose; whether the conveyor belt has a slip phenomenon (slip is too loose); the belt joint can be intact.
Seven, bearing operation status. Pay attention to the movement of the bearing and measure the heating condition: when using the thermometer to measure; rolling bearing (a small electric motor in agriculture; usually use ball bearings in front and rear) heating temperature is not allowed to exceed 95 °C; sliding bearing The heating temperature must not exceed 80 °C. When the bearing is hot; lightly smooth the grease to leak out; the bearing will be damaged; the economic loss will be formed to the user. Usually the bearing is not normally overheated; it is caused by poor bearing wear and severe wear; Stop repairing in time.
In general, the agricultural motor is in the operation process; the operator should use all methods; supervise the change of current, temperature, etc.; find abnormal abnormal stop; remove the fault and then put it into operation.
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