1, in order to maximize the efficiency of the motor in use, the capacity and model of the motor should be selected according to the different nature of the load. If the motor capacity is too large, not only cause investment losses, but also the efficiency and power factor is not high, resulting in a large loss of electric energy. If the motor capacity is too small, it is difficult to start or barely start, and the working current will also exceed the rated current of the motor, resulting in overheating or even burning of the motor windings.
2, in the selection of motor capacity, but also consider the capacity of the power transformer. In general, the maximum direct start and capacity of the asynchronous motor should not exceed 1/3 of the capacity of the power transformer.
3, for the need for continuous operation of the motor, such as the pump, fan combination of the motor, from the perspective of energy saving, the motor load is about 80%, the highest efficiency. For agricultural engines, efficiency is highest when operating at average load ratio. Therefore, for agricultural engines, when the average load is greater than 70% of the rated capacity of the engine, it can be considered that the choice of engine capacity is reasonable.
4, for short working time of the motor, such as the motor combined with the electric door, can be allowed to work with more than the rated power, which depends on whether the torque of the motor can meet the load torque requirements.
Post time: Aug-29-2023
