One, 4 kinds of commonly used electric machinery and rotate speed size
2 stage electric machinery: Synchronous rotate speed 3000, rotor rotate speed 2600 ～ 2980
4 stage electric machinery: Synchronous rotate speed 1500, rotor rotate speed 1380 – 1480
6 stage electric machinery: Synchronous rotate speed 1000, zd900 of rotor rotate speed comes 980
8 stage electric machinery: Synchronous rotate speed 750, rotor rotate speed 690 to 740
2, logarithm of electric machinery pole and formula of synchronous rotate speed
Logarithm of electric machinery pole has: 2.4.6.8. Etc
Synchronous rotate speed is formulary: N=60f/p
On the N in type — the rotate speed of electric machinery (turn / cent) ; 60 — minutely (second) ; F — power source frequency (hertz) ; P — electric machinery rotates magnetic field logarithm
Because asynchronous electric machinery has,turn poor rate, so actual rotate speed is less than synchronous rotate speed, the electric machinery that specific and actual rotate speed produces for each how many manufacturer is different, but differ very small.
QiAir Compressor in China
Slip rate calls sliding ratio again, when tire issues traction or power of apply the brake, can produce opposite motion between tire and ground
Follow the size of load and change. According to national level and IEC standard, of general asynchronous electromotor be fully loaded with turn poor rate is 1. 5 ％ of 5 ～ .
Should turn poor rate is zero hour, did not turn poor rate, namely synchronous speed. Synchronous electric machinery, did not turn poor rate.
Should turn poor rate is equal to 1 when, electric machinery does not turn. Accordingly, rotate difference cannot be 0 or be equal to 1.