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Three important parameters of environmental protection air conditioning motor

更新:10-02-2020
摘要:

Rotor chute Environmental protection air-conditioning m […]

Rotor chute
Environmental protection air-conditioning motor belongs to light load starting dream, which reduces the rotor slot properly, and has no effect on the starting performance of the motor. In the design of single-phase motor, the inclined groove with a certain pitch of rotor is often used, that is, BWK = t1o = π DIL / NL rotor inclined groove is large, which will increase the slip ratio, reduce the speed, and affect the exhaust. The tooth harmonic noise can be suppressed by using the rotor bevel. However, the tooth harmonic noise of the motor itself is far less than the aerodynamic noise produced by the wind blade ", so its influence can be ignored.

air gap
Reducing air gap properly can reduce no-load loss. Taking pf-200 environmental protection air conditioner as an example, when the air gap is changed from 0.35mm to 0.3, the rice is produced and delivered. The electric power drops about LW. When the air gap is changed to 0.25 mm, the electric power is reduced by about 2 watts. However, reducing the air gap will lead to the accuracy of machining and assembly. At the same time, the harmonic effect of the motor will be strengthened, and the electromagnetic noise will also be increased.

Polar logarithm
Generally, the environmental protection air conditioning motor with a diameter of less than 150 mm is designed as a pair of poles, and the environmental protection air conditioning motor with a diameter of more than 200 mm is designed as a pair of poles. According to the fan theory, the sound power of noise is proportional to u. (u-blade tip peripheral speed). Under the same rotating speed, the larger the fan blade is, the greater the noise is. Therefore, in order to reduce the noise, the environmental protection air conditioner with larger direct release of the fan blade should be considered when selecting the polar logarithm. It can be seen that not only the air supply volume is large, the cooling efficiency is high, but also the volume of the environmental protection air conditioning motor is small, so long as the selection of the above three parameters is paid attention to when purchasing the energy-saving environmental protection air conditioning motor.

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