The motor of the air cooler adopts electric motors china, which can adjust the motor power according to the external temperature to achieve the purpose of regulating the air supply volume of the air cooler, thereby improving the utilization rate of the air cooler and the efficiency of the system and reducing energy consumption. On the other hand, frequency converter control enables soft start of the motor, extends the motor's service life, and also reduces the workload of electrical maintenance.
1. Adjustment of motor speed.
The air cooler fan is driven by a frequency converter and a three-phase asynchronous motor. The rotational speed of the air cooler can be adjusted by regulating the output frequency of the frequency converter. According to the motor speed formula (3) : - frequency; The number of pole pairs of the motor remains unchanged for the same motor. The slip rate, depending on the motor, is generally between 0.02 and 0.06.
2. Comparison between ordinary motors and variable-frequency motors.
The original power source of the air cooler fan in the second gas processing plant was a common three-phase asynchronous motor. In practical applications, the cooling fan of a common three-phase asynchronous motor is installed on the motor shaft. At low speeds, the motor's heat dissipation capacity drops rapidly, and the motor's temperature rise increases. At the same time, in the design of ordinary motors, to enhance efficiency, the magnetic circuit is generally designed to be saturated. The output of the frequency converter contains high-order harmonics, which can deepen the saturation of the magnetic circuit at low frequencies, resulting in increased motor losses and temperature rise. To ensure the normal operation of ordinary motors, the working frequency range of ordinary motors does not exceed 30 to 50Hz, which cannot meet the requirements of production regulation. The main magnetic circuit of a variable-frequency motor is generally designed in an unsaturated state, featuring a wider speed regulation range and higher design quality. It can also further suppress high-order harmonic magnetic fields, meeting the design indicators of wide frequency, energy conservation and low noise. The cooling method of variable-frequency motors adopts independent motor drive and forced ventilation cooling, and its heat dissipation is independent of the rotational speed of the main motor.
3. Motor speed and power.
Fans are typical quadratic torque loads. Theoretically, the air volume is proportional to the first power of the rotational speed, and the shaft power is proportional to the third power of the rotational speed. When the fan speed drops, the input power of its motor decreases rapidly. Therefore, changing the ordinary motor to electric motors china can reduce the lower limit operating frequency and lower limit rotational speed of the motor. When electric motors china operates at a low frequency, the required power is greatly reduced and electricity can also be saved.
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