How to choose WP series reducers?
WP series cast iron worm gear reducer is widely used in heavy-duty industries like material handling,
mixing, mining and packaging. Follow these 4 easy steps to pick the right model for your machine,
no complex calculations needed.
Step 1: Confirm your required output speed
First, check how fast your machine needs to run. Most customers use a standard 4-pole motor (1400rpm). You can get the total ratio directly with this simple formula:
Total Ratio = 1400 ÷ Required Output Speed (rpm)
For example: If your conveyor needs 7rpm, the total ratio is 1400 ÷ 7 = 200.
Step 2: Match the correct torque
Make sure the reducer can handle your load safely.
●Check the actual torque your machine needs
●Multiply it by a 1.2~1.5 safety factor (use 1.5 if your machine starts and stops very often, or has heavy shock load)
●Pick a WP model whose rated output torque is higher than this final value.
Step 3: Pick the right installation style
WP series supports 3 common installation types to fit your site layout:
●Foot-mounted (WPA/WPS/WPD) : Horizontal installation, fixed on the base with bolts, most popular for conveyors and mixers
●Flange-mounted (WPO/WPDA) : Flange connection, no extra foot needed, saves space for vertical or compact layout
●Double-stage (WPWED) : For super low speed and very large torque, total ratio up to 900.
Step 4: Match your motor and interface
WP series uses standard IEC motor flange, which fits most global brand motors directly.
●Confirm your motor power is within the reducer’s allowed input power range
●Check the input shaft diameter and flange size, make sure it matches your motor shaft perfectly.
Need full dimension drawing, detailed weight table or custom ratio quotation? Fill in your required model, power and installation type via the inquiry form, our transmission engineer will reply within 24 hours with complete specs & weight data.