Ac frequency conversion air conditioning compressor is synchronous motor and asynchronous motor
Dc motor is synchronous and asynchronous, because the rotor speed of dc motor is related to voltage. Synchronous motor refers to the same frequency as the power supply. Ac ac is synchronous motor for dc motor. General synchronous motor is permanent magnet, replacing excitation with permanent magnet, can reduce volume and improve energy conversion efficiency. Synchronous motors are used in places with high speed requirements. The alignment and connection of the asynchronous motor's stator coils are the same as that of the synchronous motor, except that there is no permanent magnet or coil on the rotor, only an iron knot. Because with the frequency in a rotating magnetic field, rotor speed difference, thus induced in the rotor magnetic field, driving the rotor rotation, average speed is slower than the frequency of a beat, speed and the same frequency, because don't produce speed difference. The greater the speed difference, the greater the motor torque. The compressor is synchronous and asynchronous, only the synchronous motor is more efficient, the speed control is accurate. The asynchronous motor is suitable for high power compressor, such as central air conditioning. As for synchronous or asynchronous, the input is high voltage direct, because direct communication can't change frequency. The variable frequency air conditioning is used to change the ac frequency to control the speed. Turn alternating current into high voltage dc and then turn into three phase alternating current through high power IGBT. You can refer to the principle of the new energy electric motors, and the input is direct current, but the motor is a three-phase ac motor.
The starting capacity is used on a single phase ac, the most common home air conditioning, which is used to activate the capacitor. Dc frequency conversion technology is new, I also in research recently, in principle, should be to turn ac to dc, dc into a square wave power supply, to the dc stepper motor, by controlling the square wave frequency to achieve the effect of frequency conversion, otherwise, the direct current (dc) itself is no frequency said.
Frequency conversion is used to change the frequency of alternating current to control the speed. Turn alternating current into high voltage dc and then turn into three phase alternating current through high power IGBT.
The compressor is synchronous and asynchronous, only the synchronous motor is more efficient, the speed control is accurate. The asynchronous motor is suitable for high power compressor, such as central air conditioning. As for synchronous or asynchronous, the input is high voltage direct, because direct communication can't change frequency.
