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Motor and reducer

Part of the Drivetrain section. Motor + belt drive + reducer mounting and the primary vibration/torque input to the machine.

Introduction

This subassembly defines the motor/reducer selection, belt drive layout, and mounting/tensioning approach. It sets the drivetrain's radial loads (from belt tension), vibration into the frame, and the reducer output torque that drives the gear train.

Catalog links

• WEG W22 IEC TEFC catalog (IE2) — WEG catalog listing
• Sumitomo Cyclo 6000 catalog (PDF) — Sumitomo PDF

Colour key & components

Key components; colours may differ between figures. Primary intent is to specify interfaces and what contractors must validate.

Figures

P6 motor/reducer CAD (Figures 1–2). Figure 3 is a reference photo from another machine showing a nut/standoff-style motor mount concept for inspiration only — not the P6 design.

Figure 1. Motor and reducer — P6 CAD.

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Additional context: Drivetrain main gallery.

Recommended figures (contractor clarity)

• Add figure: Belt tensioning mechanism — shims, jack screw, or slide detail with center distance dimensions.
• Add figure: Motor mount plate — final material (vs wooden concept) and bolt pattern to drivetrain plate.
• Add figure: Pulley alignment check — edge/line-of-sight method for SPA belt runout.

Discussion

Rough design & intent

• Primary goal — Deliver stable reducer output torque to the gear train while keeping belt tensioning, pulley alignment, and vibration manageable.
• Mounting orientation — Current concept mounts the motor with its shaft pointing vertically downward, and the reducer input shaft is also oriented vertically downward. A belt transfers power between these vertical shafts.
• Major unknown — Belt center distance and tensioning mechanism must be finalized because it sets bearing radial loads, vibration, and stiffness requirements on the mount plate.

Reference motor + reducer specs (50 Hz vs 60 Hz)

Some legacy specs were for 60 Hz markets. China baseline is 50 Hz. Reducer model numbers below are from a prior cost list and should be confirmed (some notes suggest 6145 vs 6165).

Reference belt-drive calculation (from prior internal worksheet — must be validated)

The following values are copied from a prior internal calculation/worksheet for P6 870 (China, 50 Hz). They are provided as a starting point for contractors — do not assume they are correct. Contractor must re-check belt selection, power rating, wrap angle assumptions, tensioning method, and the resulting shaft/bearing radial loads.

• Service factor: 1.3 (worksheet input)
• Motor: WEG W21 Multimounting IE3, PN 13533507, 7.5 kW, 50 Hz, 4-pole, 1500 rpm synchronous, 1460 rpm rated, 380/660 V, 14.6/8.41 A, 49.03 N·m rated torque, 38 mm shaft
• Belt: SPA profile, wrapped; 1:1 ratio; pitch diameters 170 mm / 170 mm; target belt speed ~13 m/s
• Center distance: tentative ~340 mm (worksheet)
• Belts required: 2 (worksheet result; note: an older manual calc assumed 3 banded belts)

Key worksheet outputs (Gates/ISO 4184 method reference)

Older manual calculation notes (even more tentative)

An older manual calc (notes only) assumed 3 banded belts, center distance ~344 mm, tangential belt force ~577 N, and a reported radial load on motor ~961 N. Treat these as rough placeholders; validate with final wrap angle, friction coefficient, tension ratio, and whether an idler is used.

Known issues & risks

• Radial loads from belt tension — Contractor must quantify belt tension and resulting radial loads on motor and reducer shafts.
• Vibration — Motor/reducer vibrations transmit into the frame; mount stiffness and damping/isolation must be considered.
• Shaft extensions — Machine layout requires extending reducer input/output shafts; contractor to propose a safe, manufacturable extension/adaptor approach and tolerances.
• Belt guard not designed — A pulley/belt guard is required; mounting rails/structure on the back of the machine may be needed to support guarding.
• Downstream protection (torque limiter) — We are not sure whether the Sumitomo Cyclo reducer should include/receive a torque limiting/overload protection strategy to protect downstream components (gear train, cam bearings) during stalls or jam events; contractor to recommend.

DFM & manufacturing (China)

• Mounting — Recommend a motor/reducer mounting that supports easy belt tensioning and pulley alignment check.
• Guarding — Provide a practical pulley/belt guard that is safe yet removable for maintenance.
• Tensioning concept — Current owner concept is a "standoff stud adjustment" mount: motor sits on multiple through-studs/bolts with stacked nuts/washers (nut below plate, nut/washer above plate, motor foot, nut above foot) so motor position can be adjusted for belt tension. This approach must include a locking strategy so tension does not drift under vibration.

Belt specification — contractor support required

We want the contractor to lead belt selection and validation. Prior internal calculations exist but are not treated as correct; use them only as a starting point.

• Current CAD constraint — center distance between motor output shaft and reducer input shaft is at most 340.311 mm when tensioned, and smaller when untensioned (installation position).
• No idler — current concept uses no idler/tensioner pulley; belt tension is set by motor position (nut/standoff adjustment).
• Ratio — 1:1 pulleys (concept) and a 50 Hz motor baseline; contractor may propose alternatives if it improves reliability/serviceability.

Questions for contractor

1. Belt selection: Select the belt profile and belt count for the final pulley sizes and speed, using a defined service factor and life target. Provide the calculation basis (tables/standard) and show margins.
2. Length and center distance: Select a standard belt length that is compatible with center distance ≤ 340.311 mm (tensioned) and provides enough slack/travel for installation without an idler. Specify required adjustment travel.
3. Tension targets + procedure: Provide recommended static/installation tension (and a field procedure) compatible with our nut/standoff tensioning method (e.g., deflection force method, frequency method, etc.).
4. Radial loads: Compute radial loads on motor and reducer shafts/bearings from belt tension across min/max tension, and confirm acceptability vs motor/reducer bearing ratings and expected misalignment.
5. Locking + drift: Propose a locking strategy for the nut/standoff adjustment so belt tension and alignment do not drift under vibration (and define inspection/retension intervals).
6. China sourcing: Provide belt and pulley sourcing options available in China (and acceptable substitutes), with lead times and recommended spares.
7. Confirm the exact Cyclo 6000 model/ratio required for ~70 rpm output and provide mounting/lubrication requirements.
8. Evaluate whether to specify a torque limiter / overload protection on the Cyclo (or an equivalent protection scheme) to protect downstream components. Provide recommended settings and trade-offs.
9. Propose a practical lubrication/maintenance plan for the motor/belt/reducer: what is lubricated, recommended lubricant type, inspection interval, and how maintenance is performed safely in the pilot factory.
10. Propose input and output shaft extension/adaptor design(s) (materials, fit classes, keying/splines, runout targets) and an assembly/inspection plan.
11. Evaluate an alternative architecture: mount the motor in a conventional orientation and use a right-angle/angle gearbox to drive the vertical reducer input. Would this improve vibration, service, or safety? Provide trade-offs and sourcing options.
12. Propose a guarding concept for the belt/pulleys that can be mounted on the back of the machine (what rails/brackets are needed and how it is removed for maintenance).

Interfaces and tolerances

Known interfaces and tolerances. Links go to related subsystems.

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