Speed regulation method of three - phase asynchronous motor
Change the number of pole pairs can be adjusted, in the way around the stator coil through the tap method can achieve two-speed. With the popularity of the inverter, three-phase asynchronous motor speed mostly with the inverter.
This is the two-speed motor 1 will be the UI VI WI connected to the third phase of the remaining joint empty at this time for the four 2 U2 V2 W2 connected to the other three junctions at this time for the two levels This is the angle - there are many binary speed
In addition there are three-speed motor in this no longer introduced
The number of variable pole pairs can be varied, but the more variable the number of logarithmic materials
Like a two-speed motor with a set of windings
Three-speed motor has two sets of windings
So the current single-board frequency conversion speed up
1, frequency control, with the inverter, power
2, change the magnetic pole logarithm, not feasible.
3, stator series resistance, energy consumption
