Single-phase motor purchase should consider and pay attention to the problem

1, power: for the current rural households most of the lighting line is thinner, the voltage is low, and the user's meter is 2.5A, 5A. The motor has a large current at start-up, causing a serious voltage drop. Consider these factors choose 250,370 watts, the maximum 550 watts is appropriate. If the line should be far away from the election of low-power. 2, Specifications: BO, CO, DO type, the best performance is DO series capacitor running motor, its starting current, efficiency and power factor are high, saving. But more capacitance, higher cost. If the line is farther, the voltage is low occasion, can choose. If supporting their own agricultural machinery such as electric mill, the capacitor can be used to start the motor. Another example is the pump submersible pump, etc., mostly due to shaft seal rotation is not flexible start-up difficulties, so this motor can meet the requirements. For places with higher voltage near the circuit, you can also choose to start the motor with cheap resistance. 3, speed: In general, high-speed motor performance than low-speed motor performance is good, so try to use 2 pole 2800 rev / min speed motor. As the manufacturer's level of technology and the use of different raw materials, the same type of motor, at full load, some higher speed, some low; the other when the motor short-term overload, some speed down, and some less. Although the high speed, less motor quality decline, on the contrary, poor quality, easy to heat the current, and easy to burn line package. 4, noise and vibration: According to the size of the noise can also be roughly determine the quality of the motor. High-quality motor noise is small and not sharp. Noisy motor is not a bad motor performance is poor, or winding a partial fault and so on. Motor vibration serious, first of all, whether it is due to the machine with different heart, or the motor itself is a serious vibration, the motor is a quality problem or fault, this motor life is very low. 5, fever: the general operation of the motor will be fever, which is allowed. According to the state micro-motor temperature rise to 65. C (E-class insulation), that is, the motor operating temperature is relatively high temperature. In general, the hand motor can withstand the friction, not to retract a hot massage, of course, lower the temperature of the motor good quality. 6, supporting: choose their own supporting motor, the first note that speed should be appropriate, followed by starting capacity (full load, light load, no load) to meet the requirements. The last selected power must be suitable. Consider safe operation, the motor power is larger than the farm machinery, in order to avoid accidental overload motor fever. But not too large, otherwise it will result in waste of economy and so on.