An Inverter is the sophisticated solution to drive a motor instead of the known on/off/reverse mode by Triacs.
Driven by a DC voltage (rectified mains usually) two, four, or six
(most popular configuration) IGBT's are switched in a way that each leg of a three phase motor will get a current scheme to achieve a sinussoidal three phase current field.
Depending on the topologies of the inverter the user can now determine the speed, direction and torque of the motor in a very efficient way.
In case of high carrier frequencies of the inverter and good sinussoidal shape of the waveforms (done by DSP or Bipolar IC's) the acoustical noise of an inverter system can be reduced.
While inverter systems have been used in the industrial field for some
time now they are also gaining popularity in white goods applications (refrigerators, washing machines,
pumps etc.) because systems equipped with inverters are more efficient.
In the Japanese market 'the inverter drive inside' is a strong selling argument for household goods already.
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