Can the working current of a three-phase asynchronous motor exceed the rated current? It is not theoretically possible, so what should we do when the motor running current exceeds the rated current? Today, the editor of Dalan Electric will briefly talk about this issue with you. Rated current refers to the current when the motor is working under rated voltage (for example, single-phase motor is 220V, three-phase motor is 380V). The starting current of the motor is 5 to 7 times the rated current, because there is an excitation current when the motor starts to establish a magnetic field. The national mechanical equipment design standard is that after the equipment mechanical shaft torque is converted into the success rate, when the motor is adapted, the shaft power is amplified by 1.12 to 1.15 times, which is the selected power of the motor. Then when the equipment is running, the motor operating power (or operating current) is usually about 0.85 times its rated power, which is the normal operating power (or operating current). When the motor's operating power reaches the rated power (or rated current), the actual operating state of the equipment has exceeded the rated mechanical design power (although the equipment cannot exhibit mechanical overload). Therefore, when the motor is running in the rated current state, the equipment is continuously running in an overload state. At this time, the motor's running state is abnormal (although it can still work normally). After the rated current of the motor appears, the temperature rise of the motor rises quickly, especially when the motor is continuously running at the rated current. If the motor runs near the rated temperature rise for a long time, its heat dissipation effect will be poor. Long-term continuous operation: the first occurrence of bearing oil dryness and shaft holding failure; second, the discoloration of the coil insulation layer, which then becomes brittle, and finally cracks and insulation damage. In view of the above two points, the national machine tool electrical control standard sets the setting value of the thermal relay of the motor control circuit at 0.95 to 1.05 times the rated current of the motor. That is to say, when the motor is continuously running under the rated current state, the thermal relay will act to cut off the main power circuit in a short time. At this time, the mechanical equipment is working in an overload state, but the mechanical overload appears on the motor running current. ï¼ï¼ï¼ï¼- Editor in charge: Dalan Oil Pump Motor 02-Procurement Consultant All rights reserved http:/(Dalan Electric) Reprint please indicate the source
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