Control Logic and Inverter

Output voltage and frequency to the motor are controlled by the
control logic and inverter section. The inverter section consists
of six switching devices. Various devices can be used such
as thyristors, bipolar transistors, MOSFETS and IGBTs. The
following schematic shows an inverter that utilizes IGBTs. The
control logic uses a microprocessor to switch the IGBTs on and
off providing a variable voltage and frequency to the motor.

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