Mini frequency inverter with phase detection

The objective of the project was to develop and manufacture a frequency converter for the drive unit of a ventilation flap control system.
The drive train consists of the FI and an asynchronous machine (ASM) without rotor position feedback.
The electronics are located in a modified “terminal box” of the motor. The direction of rotation is determined by which terminal the mains voltage is applied to in order to ensure downward compatibility with predecessor types.
The end position is detected by external mechanical or electronic limit switches, which can be connected directly to the frequency inverter.
A digital input is also available for a high-speed function. A programming interface is available for software updates, via which the logic section of the frequency inverter can alternatively be supplied with voltage without the power section being active.