How to select the WP series worm gear reducer model based on torque and speed

1. Check the WP sample table according to torque and speed to determine the model.

WP model format: WPA/WPO/WPDA/WPDO + frame number (center distance) + speed ratio

Frame number (center distance): 40, 50, 60, 70, 80, 100, 120, 135, 155, 175, 200, 250

Example: WPA100-30 → horizontal, center distance 100mm, speed ratio 30

Lookup table logic:

Find the corresponding speed segment according to the output speed n₂;

According to the calculated T₂, select the smallest frame number with rated output torque ≥ T₂;

Under the same torque, the higher the speed, the frame size should be appropriately enlarged.

2. Key verification (avoiding heating/overloading)

Thermal power check (required for continuous operation)

Motor input power ≤ reducer thermal power (sample table), otherwise it will overheat and become stuck during long-term operation.

Enter speed limit

WP worm speed ≤ 1500 r/min, exceeding will aggravate wear.

Installation form confirmation

WPA: Horizontal, worm underneath

WPO: Horizontal, worm on top

WPDA: vertical, worm under the

WPDO: vertical, worm mounted on top

3. Complete Selection example

Known: Motor P=2.2kW, n₁=1450r/min, n₂≈48r/min required, medium impact.

Reduction ratio: i=1450/48≈30 → choose standard i=30

Motor torque: T₁=9550×2.2/1450≈14.5 N・m

Theoretical output torque: T₂₀=14.5×30×0.75≈326 N・m

SelectionTorque (f=1.3): T₂=326×1.3≈424 N・m

Look up the table: n₂=48r/min, T₂≥424N・m → choose WPA135-30 (rated torque ≈ 450N・m, satisfied)