Maglev Vacuum Pump for Large-Scale Industrial Conveying & Central Vacuum

A conventional vacuum pump pulls gas out of a system by displacing it mechanically — lobes, vanes, screws. All of them have bearings somewhere in the gas path or adjacent to it. All of them eventually need oil, or seals, or bearing replacements. And all of them run at speeds measured in the low thousands of rpm, because mechanical bearings can’t sustain much more without failing.

A magnetic bearing turbo vacuum pump has no bearings in contact with the rotor. The shaft is suspended by actively controlled electromagnets, spinning at up to 60,000 rpm, with nothing touching it. The vacuum is generated purely by centrifugal compression. No oil. No seals in the gas path. No wear. The design life exceeds 20 years. This is a maglev vacuum pump — the highest tier of vacuum technology we build, sharing the same magnetic bearing platform as our industrial blowers.

For large-scale pneumatic conveying, central vacuum networks, and process vacuum applications where the vacuum pump runs 24/7 and the electricity bill dominates total cost of ownership, a turbo vacuum pump with magnetic bearings is the most energy-efficient option available.

How Magnetic Levitation Works in Vacuum Service

The same five-subsystem architecture as our maglev blowers, adapted for vacuum thermodynamics.

Active Magnetic Bearings

Electromagnets arranged radially around the shaft at both ends suspend the rotor without contact. The controller adjusts current to each magnet independently, holding the shaft at the precise center of its clearance circle — to within a few microns. Zero contact at all times: startup, operation, shutdown. Unlike air suspension, which experiences brief touchdown during spin-up and spin-down, magnetic bearings levitate the rotor before rotation begins and keep it suspended until it comes to a complete stop.

German Inductive Position Sensors

Micron-level gap measurement at each bearing location. Static stability is inherent — no drift, no temperature compensation needed. Sensor data feeds the bearing controller at kilohertz rates, enabling microsecond-level response to shaft displacement.

UFRC Algorithm (Unbalance Force Rejection Control)

The rotor is allowed to rotate around its natural center of mass rather than being forced to follow its geometric axis. This eliminates imbalance excitation forces at the source — the vibration is never generated, so it doesn’t need to be damped. For vacuum service, where pressure pulsations can interact with rotor dynamics, UFRC provides an additional stability margin.

European Safety Bearings + UPS

If grid power fails, the UPS keeps the magnetic bearings energized while the rotor coasts down to a safe transfer speed. European-imported mechanical backup bearings catch the rotor without damage — rated to survive more than 10 full-speed drops, tested under controlled conditions.

Self-Sweeping Frequency Analysis, 0–2 kHz

Before and during spin-up, the controller sweeps through the 0–2 kHz range to identify and avoid structural resonances. This is especially important in vacuum service, where the lower gas density inside the pump changes the rotor’s modal characteristics compared to pressure service.

Vacuum-Specific Drive Curves

This is the key adaptation for vacuum. The thermodynamics of pulling gas from sub-atmospheric pressure are fundamentally different from compressing against discharge resistance. As vacuum level deepens, gas density at the inlet drops. Mass flow through the impeller decreases non-linearly. The motor’s load characteristic shifts. Our vacuum models run drive curves programmed specifically for suction service — the motor stays in its peak efficiency zone from shallow vacuum to deep, rather than wasting energy on a pressure-optimized curve that doesn’t match vacuum thermodynamics.

Product Range

SLDS-CX Series — Compact Industrial Maglev Vacuum

Full active magnetic levitation in a compact footprint. For small to mid-size vacuum applications.

850 × 1750 × 1640 mm cabinet. All models include the full five-subsystem maglev architecture with ISO 14839 compliance.

SLDS-xc Series — Industrial Maglev Vacuum

Single-impeller and double-impeller configurations for large installations. 50 to 400 HP (37–300 kW). Flow from 19 to 336 m³/min at vacuum levels up to -120 kPa.

Flow figures are suction flow at the inlet under vacuum conditions. As vacuum level deepens, actual suction flow decreases — normal behavior for any positive-displacement or turbo vacuum pump. Contact us with your target vacuum level and required suction flow to confirm the right model.

SLDSC-xc Series — Dual-Stage Compression (Deep Vacuum)

For processes requiring vacuum beyond -120 kPa. Two compression stages in series multiply the pressure ratio to reach vacuum levels that a single impeller cannot achieve. Available from 50 to 400 HP. Based on the xc maglev platform with the full five-subsystem bearing architecture.

Applications

Large-Scale Pneumatic Conveying

When a cement plant, chemical processor, or food manufacturer runs vacuum conveying systems that move tons of material per hour over hundreds of meters of pipeline, a roots vacuum pump at the heart of that system is burning electricity around the clock — often 8,000+ hours per year. A magnetic bearing vacuum pump cuts that energy consumption by 30 percent or more. On a 300 kW motor running 24/7 at $0.10/kWh, that’s roughly $79,000 per year in electricity savings alone. At industrial scale, the payback period on the price difference between a maglev vacuum pump and a roots vacuum pump is measured in months, not years.

Central Vacuum for Manufacturing

Automotive plants, electronics factories, and pharmaceutical facilities running building-wide central vacuum networks — multiple pick-up points, variable demand, continuous operation. CX and xc maglev vacuum pumps with VFD speed control match output to actual system demand rather than running at full capacity and bleeding off excess through relief valves. The VFD responds to pressure transducer feedback from the vacuum header, adjusting motor speed in real time as individual workstations cycle on and off. For facilities with energy managers tracking kWh per unit of production, the transition from fixed-speed roots pumps to variable-speed maglev is a reportable, verifiable improvement.

Process Vacuum in Harsh Environments

Chemical processing, solvent recovery, soil vapor extraction — applications where the gas stream contains corrosive or condensable components. The maglev pump’s fully sealed motor and bearing system, with no oil or grease exposed to the process gas, means the active components are protected from the process stream. The only surfaces in contact with the gas are the impeller, volute, and inlet piping — all of which can be specified in corrosion-resistant materials.

For particularly aggressive environments, the LS corrosion-resistant variant applies electroplated surface treatment to the aluminum housing, extending service life by approximately 10× compared to untreated aluminum in salt-spray and acidic vapor exposure. Contact us with your gas composition for a material compatibility assessment.

What’s Inside

Identical platform to the magnetic levitation blower line:

• Active magnetic bearings — zero mechanical contact, zero friction, zero lubrication, >20 year design life
• PMSM motor — up to 60,000 rpm, >95% efficiency, rare-earth permanent magnets from Ganzhou
• 3D-flow impeller — aviation-grade aluminum (AL 7075), 5-axis CNC, 1-micron (0.001 mm) tolerance, 210-hour / 80,000 rpm fatigue tested on German dynamic balancing equipment
• Direct drive — 100% power transmission, no belts, no couplings, no gearbox
• Integrated controller — UFRC algorithm, ISO 14839 compliance, self-sweeping frequency analysis, UPS power-off protection
• German inductive sensors — micron-level shaft position accuracy at kilohertz sampling rates
• European safety bearings — tested to survive >10 full-speed rotor drops
• Vacuum-optimized drive curves — motor stays in peak efficiency zone from shallow to deep vacuum

All components are shared with the blower line. If you run both maglev blowers and maglev vacuum pumps in your plant, spare parts inventory, maintenance procedures, and operator training are unified across both applications.

Maglev Vacuum vs Other Vacuum Technologies

Vacuum Pump or Blower?

• Need pressure (aeration, air supply, pneumatic conveying — pressure side)? See our Magnetic Levitation Blower page
• Need a more budget-conscious vacuum option? See our Air Suspension Vacuum Pump page (KF series, 8–45 kW)

Frequently Asked Questions

What is a maglev vacuum pump?

A maglev vacuum pump is a centrifugal vacuum pump where the rotor shaft is suspended by actively controlled electromagnets (magnetic bearings) rather than mechanical ball bearings or air film bearings. The rotor spins at up to 60,000 rpm with zero physical contact, generating vacuum through centrifugal compression. No oil, no mechanical wear, and a design life exceeding 20 years. It’s the vacuum counterpart to a magnetic levitation turbo blower.

How deep a vacuum can a maglev vacuum pump achieve?

Single-stage xc models achieve up to -120 kPa. For deeper vacuum requirements, the SLDSC-xc dual-stage series delivers beyond -120 kPa by compressing the gas in two sequential stages — the discharge of the first stage feeds the inlet of the second, multiplying the pressure ratio. Contact us with your target vacuum level for a specific model recommendation.

Is there a minimum flow requirement to prevent surge?

Yes. Like all centrifugal compressors, turbo vacuum pumps have a surge boundary — a minimum flow below which stable compression cannot be maintained. Our electronic surge protection system monitors real-time operating conditions and opens a relief valve preemptively if the pump approaches the surge line. For applications with highly variable demand, we can help size the system to ensure the operating envelope stays within the safe zone, or recommend a VFD control strategy that modulates speed to match demand rather than throttling flow into the surge region.

Can a maglev vacuum pump and maglev blower share spare parts?

Yes. The CX and xc maglev vacuum pumps share the same bearing, motor, impeller, controller, and sensor components as the equivalent blower models. The only difference is the drive curve programming (vacuum vs pressure) and the port configuration. A plant running both maglev blowers and vacuum pumps can stock a single set of spare parts and train operators on a single platform.

What happens during a power failure?

The integrated UPS keeps the magnetic bearings energized during a grid failure. The rotor coasts down while still fully levitated, then transfers smoothly onto the European safety bearings once it drops below the safe touchdown speed. The entire shutdown sequence is autonomous — no operator intervention required. When grid power returns, the system performs its self-sweeping frequency analysis and restarts normally.