Motor and diesel and gasoline compared to not only easy to use, and rarely fails. However, the motor is running, if not promptly monitor the operation, it is easy to burn. Therefore, agricultural motor should be running pay attention to the following seven monitoring projects.
First, the motor temperature rise. The motor temperature rise is the difference between the motor operating temperature and ambient temperature. Each motor has its own allowable temperature rise limits. Some motor nameplate permissible temperature rise limits, some marked with the level of insulation material. The operating temperature limit allowed by the motor of various insulating materials are as follows: Y, 90 ° C; A, 105 ° C; E, 120 ° C; B, 130 ° C; F, 155 ° C; H, 180 ° C; C, 180 ° C or more. Agricultural motors generally use Class B insulation materials, the allowable temperature rise is 75 ℃. Motor when the temperature rise should not exceed the limits allowed on the motor nameplate. The temperature rise in the motor running is a direct and reliable way to monitor the motor operating conditions. Mostly in rural areas, on-site monitoring of motor temperature by hand experience, the hands touch the chassis to feel hot, but continued exposure to a short time, and the temperature is no longer rising, and will not overheat; if the hand is too hot and immediately withdrew it, and small water drops of up issued a "trace" of the sound immediately evaporated, then the motor may overheat. Should be immediately shut down, the identify overheated reason, after troubleshooting the power to run. The line on the road to install a voltmeter, ammeter and overload protection device, but also to monitor the temperature rise.
Two, the sound of the motor in operation, vibration and odor. Agricultural motor during normal operation, the sound is smooth, light, uniform, people listening to "machine music" feeling, no insulating paint odor and coke smell. If abnormal sounds (screaming, boring, friction, and harsh noise), severe vibration, insulation paint coke odor (usually pills only to discover issued by agricultural motor insulation barbecue, then touch the motor am hot. oil burning smell, are generally bearing short of oil, close to the dry mill, bearing temperature, evaporation of oil and gas and odor. touch the bearing parts feel hot), indicating that the motor overheating or other failure.
Third, the motor running. The current motor run-time in the state of the rated operating current value is called the rated current of the motor. Generally marked in the motor nameplate. Under normal circumstances, the actual current should not exceed the nameplate rating. Should also pay attention to the balanced three-phase current, the current difference of any two phases should not be greater than 10% of the rated current, otherwise the motor failure. Particular attention to whether there are missing running, because the survey showed that agricultural motor burned 85% because of missing running. Therefore, lack of protection, at the same time, a larger capacity motor shall be equipped with ammeter to monitor operating current, the smaller capacity of the agricultural motor, rarely installed ammeter, the monitor should always use a clamp meter to measure the motor line current .
Fourth, the supply voltage. The voltage of the motor when running under the rated operating conditions is called the rated voltage. The actual operating voltage range for the motor should not exceed 10% or below the rated voltage, rated voltage of 380V motor, plus the actual voltage should be between 242 to 418V and below 242V, may be appropriate to reduce the load operation. Otherwise, the motor should stop running. Meanwhile, the three-phase voltage to maintain symmetry, the imbalance can not be too large. Usually, any difference between the two-phase voltage should not exceed 5%, otherwise it will cause the motor temperature is too high, shorten the motor life, and even burned. Motor power is best fitted to a voltmeter and switches directly monitor the actual operating voltage of the motor.
The work of V. fuse or fuses. Fuse or fuses are short-circuit protection of the motor. Agricultural motor in the actual operation due to a phase fuse or fuse blown, causing the motor burnt the phenomenon of missing running. Therefore, you should always pay attention to whether there is a phase fuse blown, in particular, use the knife to control the motor, but should always check the fuse. Meanwhile, in the election for the small agricultural motor melt when its rated current should be higher than described in the books of general electrical fuse fuse current 1.5 to 3 times the motor rated current is somewhat larger. This is because the small current melt less reliable if the melt of the current election too small, there is a phase melt fuse the motor phase to run burnt motor may. Selected value is somewhat larger, to increase reliability and to avoid missing running the motor from overheating.
Six gear. To pay attention to whether there is loose pulley or coupling, transmission belts or without skidding (slip the belt is too loose), belt connector is intact.
Bearing work. Attention to listen to the sound of bearings and measure fever circumstances: with a thermometer to measure the bearing (agricultural small electric motors, generally before the back-end are made of ball bearings) fever temperature should never exceed 95 ° C, the sliding bearing heating temperature should never exceed 80 ° C. Bearing heating, ranging from the grease diluted leakage, the weight is bearing damage, economic losses caused to the user. General bearing sound is not normal or overheating, undesirable wear of the bearing lubrication serious due should be down for maintenance.
In short, agricultural motor during operation, the staff to make use of all means to monitor its current, temperature changes, abnormal timely shutdown, troubleshooting, and then put into operation.



Other News:
Agricultural motor in the operation of the monitoring should be seven projects
Machine tools and machine tool lubrication oil (fat) performance requirements
Bearing nylon maintains a several opinions
Guide design matters
The determination of rings processing methods
Linear motion ball bearing structure and purpose
South Korea worried that Japan's development of nuclear weapons
Bearing structure on the influence of vibration and noise