AS500H series high-protection inverter not only has typical V/F control technology, speed sensorless vector control technology, closed-loop vector control and torque control technology, but also adopts synchronous open-loop vector control technology, synchronous closed-loop vector control technology, and combines Domestic application characteristics have further strengthened product reliability, environmental adaptability, and customized and industrialized design. The products are widely used in heavy industrial and construction machinery loads, suitable for asynchronous motors and synchronous motors.