R/F/K/S Series

Aluminum Housing Motor for Gear Reducers

Engineered for direct coupling with R/F/K/S series gearboxes. Eliminate flange adapters for a compact, high-efficiency drive integration.

Space is a premium asset on any automated production line. The RFKS Series cuts out the redundancy of standard IEC motors—eliminating the need for bulky adapter plates and couplings.

Featuring a specialized oil seal configuration and custom shaft extension, this series is built for direct insertion into R (Helical), F (Parallel Shaft), K (Helical-Bevel), and S (Helical-Worm) gear reducers. Fully compliant with IE3 Premium Efficiency standards (IEC 60034-30-1), the RFKS series delivers a shorter, lighter, and more direct power transmission solution for your machinery.

Decode the JWmotor model number to quickly identify the specifications for a precise replacement.

Technical Specifications

JWMotor Product Range:

Power Range (KW)

0.75 – 630

Poles

2, 4, 6, 8, 10

Frame Size (IEC)

80 – 400

Rated Voltage

220V – 690V

Operating Conditions

+5°F To +104°F

Ambient Temperature

≤1000m

Altitude

Up to 120°C

Voltage Tolerance

* Class H insulation is available for high-temperature environments.
* Power derating is required for high-altitude regions.

JWMotor offers you motor solutions with the following
significant advantages

Integral Direct Mounting

The motor shaft extends directly into the gearbox to serve as the first-stage pinion. This design completely eliminates vibration risks caused by coupling misalignment and achieves a transmission efficiency approaching 100%.

Ultra-Compact Footprint

Compared to the traditional “Standard Motor + Flange Adapter” configuration, the RFKS series reduces axial length by 10-20%. This is critical for space-constrained applications such as AGVs (Automated Guided Vehicles), conveyor lines, and packaging machinery.

Enhanced Leak-Proof Sealing

Addressing the common issue of oil seepage at gearbox interfaces, we feature an optimized oil seal chamber within the motor end shield. Equipped with standard high-temperature FKM (Viton) oil seals, this design is ideal for demanding vertical mounting positions (V1/V3).

High Starting Torque

Optimized for applications requiring heavy start-ups under load (e.g., hoists, conveyors), the rotor slot profile is engineered to deliver high starting torque characteristics comparable to NEMA Design C standards.

Industry Applications

FAQ

What are the mounting advantages of the RFKS series?

The RFKS series (R-Helical, F-Parallel Shaft, K-Bevel, S-Worm) offers a modular design. This allows for multiple mounting positions (flange, foot, or shaft-mounted), making them easily adaptable to cramped industrial layouts.

How do I choose between the K-series and S-series gear motors?

The K-series (Helical-Bevel) offers higher efficiency (up to 95%) and longer life for heavy-duty tasks, while the S-series (Helical-Worm) is more cost-effective and provides a “self-locking” feature, which is ideal for simple conveyor applications.

Are your RFKS gear motors interchangeable with European brands?

Yes, our RFKS series follows international standard dimensions, making them drop-in replacements for many SEW-style or Nord-style gearboxes, saving you significant downtime during replacement.

Ready For Powerful Solutions

Great motors start with great materials. Built with
premium components for lasting power. Make the right
choice for your business today.

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