Features 1. Adopting space voltage vector PWM control and no-speed sensor control; 2. 150% rating torsion at 1Hz; 3. Perfect function, small volume, suitable for on-site secondary equipment; 4. with the function of auto voltage regulated (AVR) and automatic current-limited, the system is more stable; 5. Built-in PID controller, capable of realizing the constant voltage (stream etc.)(optional function); 6. Up to 16 speed control and simple and easy pendulous frequency function 7. 0-20KH pulse input/output interface, easy to constitute digital closed lop control sysem 8. Capable of built-in RS485 communication interface (optional parts), easy to realize the integrated control and master-slave linkage control.