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Foot-Mounted Motor Shells
Foot-mounted motor shells are structural enclosures designed with integrated mounting feet for direct bolt-on installation to machinery beds or frames. These shells provide rigid support, accurate rotor alignment, and vibration damping for electric motors in stationary industrial environments. Manufactured from deep-drawn steel or heavy-gauge sheet metal, the foot-mounted design distributes operational loads evenly across the base, reducing resonance and torsional stress. Jiangsu Yufeng Electric Co., Ltd. produces foot-mounted shells through a complete process chain: stamping, robotic welding, precision machining, and anti-corrosion surface treatment. Each shell is dimensionally verified with CMM and laser inspection to ensure compatibility with standard NEMA and IEC motor frames. The foot geometry, bolt-hole patterns, and wall thickness are tailored to match torque ratings from 0.75 kW to 315 kW, serving general-purpose and heavy-duty motor series.
Core advantages
- Integrated foot profile eliminates separate bracket components, reducing assembly time and part count.
- Stamped and welded steel construction maintains consistent wall thickness and flatness across the mounting interface.
- Machined foot pads and reference surfaces achieve flatness within 0.05 mm, ensuring perpendicularity to shaft axis.
- Full-process in-house production (blanking, welding, machining, painting) enables strict dimensional control and traceability.
- Engineering support for custom foot patterns, bolt-hole sizes, and conduit box locations based on motor frame drawings.
Product characteristics
Technical parameters (representative models)
| Frame size (IEC) | 80 | 112 | 160 | 225 | 315 |
| Foot hole diameter (mm) | 10 | 12 | 14 | 18 | 24 |
| Foot pad flatness (mm) | 0.04 | 0.04 | 0.05 | 0.05 | 0.06 |
| Shell wall thickness (mm) | 3.0 | 3.5 | 4.5 | 6.0 | 8.0 |
| Mass (kg, approx.) | 4.2 | 9.8 | 22.5 | 41.0 | 78.0 |
Application scenarios
- Industrial drives: conveyor systems, compressors, pumps, and fans where motor base mounting is standard.
- Machine tools: spindle motors, feed drives, and auxiliary axes requiring rigid foot fixation.
- Agricultural machinery: grain elevators, mixers, and irrigation pumps with continuous operation.
- HVAC equipment: air handling units, cooling towers, and chiller motor enclosures.
- New energy systems: stationary battery cooling fans and auxiliary power units.
Installation & service notes
Ensure mounting base surface flatness does not exceed 0.08 mm over the foot span. Use shims only under the entire foot pad, not under individual bolts. Torque foot bolts to the value specified for the frame size (typically 40–120 N·m). Re‑check bolt torque after 10 hours of operation. For motors with high radial loads, consider additional dowel pins to prevent foot shifting.
Frequently asked questions
Yes. Jiangsu Yufeng Electric offers customization of foot hole positions, diameters, and pad thickness. Provide a dimensional drawing or frame specification, and the engineering team will revise the stamping and machining programs accordingly. Minimum order quantity for custom patterns applies.
For outdoor or high‑humidity environments, a polyester powder coating with a minimum 100 μm thickness or zinc‑nickel plating with passivation is suggested. Yufeng provides salt spray test reports (up to 480 hours) for coated shells upon request.
Concentricity is ensured by machining the foot pads and the bearing bore in a single fixturing setup on a CNC horizontal machining center. The reference surfaces are machined after welding, and each shell is verified with a coordinate measuring machine (CMM) to keep concentricity within 0.04 mm.
Yes. The shell dimensions, foot hole spacing, and shaft center heights are manufactured to comply with both IEC 60072 and NEMA MG‑1 standards. The same shell can be offered with metric or imperial bolt holes based on destination market.
Jiangsu Yufeng Electric Co., Ltd. has manufactured motor housings for over 40 years, with a dedicated production line for foot‑mounted shells. The facility operates 16 stamping presses, 24 welding stations, and 12 CNC machining centers, achieving an output of 5 million units annually. Every shell lot is accompanied by dimensional reports and material certificates.
Manufacturing Solutions
We offer full-process manufacturing capabilities from steel processing to finished product delivery, supported by stamping lines, automated welding equipment, machining facilities, and inspection instruments. Backed by an engineering team with an average of over 20 years of experience, we provide technical support from development to mass production.
With 40 years of focus on motor housing manufacturing, we have served more than 50 customers and achieved an annual production capacity of over 5 million units. Guided by quality, efficiency, and fast response, we are committed to delivering high-precision and high-reliability motor housing solutions.
