Pole pair selection P Generally, the environmental prot […]
Pole pair selection P Generally, the environmental protection air conditioner motors below 150 mm are designed as a pair of poles, and the environmental protection air conditioners above 200 mm are two pairs of poles. According to fan theory, the sound power of noise is proportional to u. (U-tip tip peripheral speed). At the same speed, the larger the blade, the greater the noise. Therefore, in order to reduce the noise, the direct release of the blade is more effective. Large environmentally friendly air conditioners should be considered when choosing the number of pole pairs
Selection of rotor material The environmental protection air-conditioning motor belongs to the light-load starting dream. The rotor chute is appropriately reduced, which has no effect on the starting performance of the motor. Generally, when designing single-phase motors, a chute with a certain pitch of the rotor is often used, that is, a large chute of the rotor will increase the slip rate, reduce the speed, and affect the exhaust air. The use of rotor skew grooves can suppress tooth harmonic noise. However, the tooth harmonic noise of the motor itself is far less than the aerodynamic noise generated by the wind blade, so its effect can be ignored.
The choice of each air gap appropriately reduces the air gap to reduce the no-load loss. Taking PF-200 environmental protection air conditioner as an example, when the air gap is changed from 0.35 mm to 0.3 production and delivery meters, the electric power is reduced by about 1 watt. . When the air gap is changed to 0.25 mm, the electric power decreases by about 2 watts.