Three-phase motors can be changed to single-phase motors, but can we change single-phase motors to ...
can be changed to single-phase motors, but can we change single-phase motors to three-phase motors? This is undoubtedly not a problem that everyone cares about. Just yesterday, a netizen asked us about related issues. So, let's find out today. At the end, you will know whether it is possible or not to change a single-phase motor to a three-phase motor.
First, a distinction must be made between whether the motor is star-connected or delta-connected. It can be connected as shown in the figure, C is the capacitor, and the capacity is 0.07*motor power. The two points ab are the three-phase input points of the original motor, and the point without the letter is another contact.
The total number of turns of the main winding of a single-phase motor is equal to the total number of turns of each phase of a three-phase motor.
After changing 1 phase to 3 phase and changing the 3 phase winding, should the current density be considered, does the number of turns remain the same in any winding method? How much power is added after changing 1 phase 2.2KW to 3 phase?
When the number of magnetic poles is unchanged, the number of winding turns is unchanged; when the number of magnetic poles is unchanged, the number of winding turns is unchanged. If the number of poles is changed, the number of winding turns should be increased or decreased.
The power of single-phase 2.2KW to three-phase will increase by about 1/3.
There is no calculation formula for single-phase to three-phase. The calculation formula for the motor core can be used, but it is more complicated. You need to know the inner and outer diameters of the core, the length, the number of slots in the stator and rotor, and the area of the core slots. The number of stages of the motor, the magnetic flux density of the silicon steel plate, etc. are limited by the cross-sectional area of the single-phase motor slot, so the effect after recombination is not good.
As far as the modern motor industry is concerned, the power of single-phase motors is relatively small, and the power of restructured three-phase motors is also small. The reconstituted winding requires new enameled wire, other materials and processes, which can cost a lot. , Now the second-hand market is very developed, it is recommended to go to the second-hand market to trade, you will find a very suitable three-phase motor.