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The use of power electronics to supply induction motors is widely spreading out due to significant advantages in terms of speed and torque control of electrical machines.
The most common are ASD (Adjustable Speed Drives) systems, lead by PWM (Pulse Width Modulation) techniques.
Unfortunately, it has been proved that this kind of power supply can cause overstress on electrical insulation in comparison to the sinusoidal 50/60 Hz voltage supply, thus decreasing drastically life and reliability of controlled motors.
The reliability of winding insulation, as it occurs for other insulation systems, can be investigated by Partial Discharge (PD) analysis.
In order to reproduce the same stress conditions on the insulation materials of the conductor’s windings of induction motors, TechImp Systems has developed a new complete system dedicated to tests on twisted pairs or other specimens, under high voltage square waveforms conditions.
The off-line testing apparatus is composed by a high voltage square wave generator, the TechSQUARE 4000, whose amplitude, frequency, duty cycle and rise time are selectable by the user.
The TechSQUARE can be used in combination with the PD Solver 6100, in order to obtain a powerful testing set to investigate the behaviour of materials for the construction of motors fed by frequency converters.
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