Reversible air motors by Mannesmann Demag in highest quality

Reversible Motors from Mannesmann Demag: Precise Pneumatic Motors for Industrial Applications

Reversible motors from Mannesmann Demag offer speed and direction-reversible pneumatic drives for demanding industrial tasks. In this category, you will find compact models with nominal power ratings from 0.13 kW to 0.82 kW, which are mechanically robust, service-friendly, and designed for use in dusty or humid environments. These motors combine easy controllability with high starting torque capability, low profile, and variable connection options, making them an economical alternative to electric drives in explosive or hard-to-reach areas.

Construction and Materials

Mannesmann Demag relies on proven materials for reversible pneumatic motors: housings made of die-cast aluminum or ball-bearing mounted cast steel housings, hardened steel gears or precise rotor/vane constructions, and shafts made of stainless steel (INOX) for corrosion resistance. Liners and bearings typically use highly wear-resistant plastics or bronze versions, depending on the model. Seals are elastomeric NBR or Viton elements; for increased temperature requirements or chemical exposure, PTFE or FKM seals are used. End caps are often anodized or painted for additional corrosion resistance.

Designs, Dimensions, and Mounting

The product range covers various designs: cylindrical standard motors with axial output, compact right-angle gear variants for space saving, and flange motors for direct machine integration. The shaft is available with a keyway, feather key, or cylindrical connection. Mounting holes and flange constructions follow common standard dimensions for easy interchangeability in existing machines. Mounting and alignment options consider vibration dampers and bolt-on surfaces to reduce bearing loads. Custom adaptations are available for attachments such as couplings or pulleys.

Connections, Control, and Reversing

Reversibility in these motors means that the direction of rotation and power can be quickly changed via pneumatic valves or mechanical switching devices. On the connection side, ISO standard threads, quick couplings, or special connections for high-pressure hoses are used. Motor control is preferably carried out via 3/2- or 5/2-way valves; frequency-independent proportional valves allow finer speed adjustment, and integrated control valves with check and throttle options improve control behavior and energy efficiency. For applications with digital control, pneumatic logic components can be combined with electrical interfaces; mounting slots and adapters for sensors (speed, pressure) are often provided.

Power, Torque, and Characteristic Curves

The motors offered cover a power range from 0.13 to 0.82 kW. Characteristic curves show the typical dependence of speed and air pressure; at reduced supply pressure, the torque decreases proportionally, while the no-load speed remains dependent on air volume. Starting torque in pneumatic motors is often significantly higher than the nominal torque at low speeds, making them ideal for applications with load peaks. Efficiency data refers to volumetric losses and mechanical friction; with correct air preparation (filter, pressure regulation, oil separation), the specified values can be reliably achieved. For precise design, detailed characteristic maps can be found in the technical data sheets.

Seals, Lubrication, and Air Preparation

Service life and performance depend significantly on air preparation. An oil mist system or pre-set lubricators are recommended if regulated lubricants are not already provided in the components. Moisture and dirt reduce seal life; therefore, filter-regulator-lubricators (FRL) with fine filters and condensate drains are essential. For critical applications in food or pharmaceutical environments, special food-grade lubricants and sealing materials are available. For higher demands on tightness and cleanliness, additional membrane protection systems and suction or pressure drainage are used.

Safety and Normative Requirements

Reversible pneumatic motors meet common industrial safety requirements; certified variants are available for Ex-areas. Expect CE conformity, where applicable ATEX approvals, and documentation on operational safety as well as mounting instructions with warnings. Safe shutdown conditions, check valves, and pressure relief measures should be considered during system integration. Protective enclosures and transparent safety concepts reduce operational risks and simplify approval tests in production environments.

Application Areas and Practical Examples

Reversible motors are used where precise direction changes, high shock resistance, and operational safety under harsh conditions are required. Typical industries include mechanical engineering, conveying technology, packaging systems, heavy industry, welding and assembly workstations, as well as repair and maintenance equipment. Structured practical examples for direct transferability follow below.

Practical Example 1 — Conveyor Line with Direction Change: In a packaging line, a reversible pneumatic motor controls a small buffer conveyor section. In case of a jam, a proximity sensor detects the blockage; via a 5/2-way valve, the speed is reduced and then briefly reversed to return the product and prevent overflow. Mounting: Flange mounting, shaft with feather key, air preparation with fine filter + oil mist lubricator, valve control via PLC relay. Result: Reduced downtime and less wear on product guides.

Practical Example 2 — Rotary Tool in Welding Cell: A compact model with high starting torque is used as a drive for a rotary welding tool. The reversible function allows quick direction changes for symmetrical welds. Installation with INOX shaft and FKM seals, additional membranes against sparks, and integrated speed sensor for quality assurance. Result: Stable seam guidance under changing loads and extended service life.

Practical Example 3 — Test Bench with Switching Logic: In a test bench for hydraulic valves, a wide variety of torques are simulated. The reversible motor allows stepless acceleration and deceleration via proportional valves and quick direction changes for cyclic loading. Mounting with vibration-damped fastening, pressure regulator for a constant characteristic curve, and torque-measuring shaft for test protocols. Result: Reproducible load tests and easy integration into test software.

Selection Criteria and Integration

When selecting, consider operating pressure requirements, desired continuous and peak torque, installation situation, environmental conditions, and necessary approvals. Connection types, available air volume, required control accuracy, and maintenance intervals are also crucial. Use the technical data sheets for service life calculations and check whether additional components such as dampers, couplings, or sensors are required. Additional information on suitable components and technical services can be found under Technology and in specific Application Examples.

Maintenance, Spare Parts, and Service Life

Maintenance effort is moderate: regular checking of air preparation, replacement of fine filters and seals, adjustment of lubrication quantity, and inspection of bearings play the biggest role. Spare parts include shafts, seal kits, bearing packages, valve plates, and injectors. With documented maintenance, motors often achieve service life values that surpass electric drives in contaminated environments. For long availability, service plans and spare parts packages should be considered when ordering.

FAQs

• What advantages do reversible pneumatic motors offer over electric drives?
  Higher starting torque at low speeds, insensitive to overload and vibrations, simple direction reversal without contactor changes, safe use in explosive areas, and shorter reaction times during load changes.
• What air preparation is necessary?
  Fine filter (≤5 µm), pressure regulator, and oil mist lubricator or lubricator depending on the model. Condensate drains and dew point control reduce wear; for sensitive applications, oil preparation with food-grade or pharma-certified lubricants.
• How do I choose the right motor size?
  Basic analysis: required continuous and peak torque, available air volume at system pressure, installation geometry, and desired controllability. Use technical data sheets with characteristic curves and, in case of doubt, simulate load cases on a test bench or consult our technical support.