1. High-quality aluminum alloy casting box, suitable for all-round universal installation configuration; 2. Sufficient cooling ribs, so that the body has excellent heat conduction performance; 3. From 025 to 150, a total of 10 frame specifications; Transmission power range from 60W-15kW; 4. Large range of speed ratios, each single frame has 12 kinds of reduction ratios from 5:1 to 100:1; 5. Precision grinding hard tooth surface transmission worm, high efficiency, large output torque; 6. Low noise and stable operation, suitable for long-term continuous work in harsh environments; 7. Light weight and high mechanical strength; 8. Modular combination of PCRV and DRV expands the transmission ratio of NMRV reducer to: i=5--5000