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Three-phase asynchronous motors are widely used in industrial and agricultural production due to their simple construction, low cost, convenient maintenance and reliable operation. The power supply of the three-phase motor should be a three-phase power supply, but in reality, it is often encountered that there is only a single-phase power supply. In particular, the single-phase motor is used in household appliances. If it is broken, it is necessary to replace it with a three-phase motor. Make appropriate adjustments to make the three-phase motor adapt to the single-phase power supply and work normally. The following is a detailed description of the wiring method.
To operate a three-phase motor with a single-phase power supply, simply add a suitable phase-shifting capacitor as follows: For a star-connected motor, the wiring method is shown in Figure 1. For a delta-connected motor, the phase-shifting capacitor is based on practice. The capacity value should be approximately equal to the product of 0.07 and motor power. For example, the motor power is 150 watts. The capacity of the selected capacitor should be approximately equal to 0.07 x 150=10.5 microfarad. It can be satisfied by connecting two fluorescent lamp capacitors (4.75μF) in parallel. Claim. If the motor starts very quickly and you hear a loud click, reduce the capacitor capacity; if the motor starts slowly, increase the capacitor capacity appropriately. Another example is that the power line can be changed from a point to point b to change the motor steering.
There are three ways I know:
1, and capacitive phase shift
2, capacitive inductance phase shift (this method is also applicable to 380V two-phase power supply)
3. Pull-on capacitor phase shifting, rated current: When the rated power is output under the rated working state of the motor, the rated current of the line current of the stator winding: under the rated working state of the motor, the line voltage of the stator winding is emphasized.
And the method of capacitive phase shifting This method should be the simplest wiring method: on the terminal of the three-phase power line, just find two terminals and one capacitor, one phase of the single phase power supply, one of the capacitors Terminate another line, for example, a, b, c three-wire head. a, b connected to the power supply, a, c connected to the capacitor, if reversed, the power supply is changed to b, c capacitor calculation formula is: C = 1950 * I / U * COS I = motor rated current U = rated voltage COS power factor C = Capacitance capacity (microfarad) wiring, on the original three-phase power line terminal, just find two terminals and a capacitor, an empty one connected to the power supply, and the other end of a capacitor Another line, if reversed, the other line of the capacitor is switched to another part of the capacitor. The power factor needs to be calculated. Power factor × efficiency = motor rated power / (number 3 × rated voltage × rated current) efficiency = (motor rated power / motor input power) × 100% motor input power = (root number 3 × U line × I line) According to the above formula, the power factor of the motor can be calculated and then the capacitance calculation formula is: C=1950*I/ U*COS can calculate the capacity of the required capacitance for connection. The motor efficiency on the motor nameplate may not be accurate. The motor efficiency may be incorrect or greater than 1 or equal to 1Y series asynchronous motor. The efficiency below 10KW is between 76% and 86%. Can make a reference, it can't be done, you can also According to these data, directly select the appropriate capacitor 0.4KW star 0.024uf triangle 0.06uf0.8KW star 0.036uf triangle 0.06uf1.0KW star 0.06uf triangle 0.1uf1.6KW star 0.1uf triangle 0.16uf2.5KW star 0.15 Uf triangle 0.25uf Let's talk about the second inductor-capacitor phase shift: wiring method 1, delta connection motor a, b, c three wire ends, a, b capacitor, b, c connected to the inductor, then a terminal and c terminal Each line leads to a single-phase power supply.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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