Low-cost, Bearing-less Hysteresis Rotary Pumps for Delivering Sensitive Materials

Technology #17948

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Professor David Trumper
Department of Mechanical Engineering, MIT
External Link (pmc.mit.edu)
Minkyun Noh
Department of Mechanical Engineering, MIT
Managed By
Christopher Noble
MIT Technology Licensing Officer - Clean and Renewable Energy
Patent Protection

Homopolar, Flux-biased, Hysteresis Bearingless Motor

US Patent Pending US 2017-0040868

Homopolar, Flux-biased, Hysteresis Bearingless Motor

PCT Patent Application WO 2017-024119


This technology can be used in making:

  • Miniature pumps for biomedical applications
  • Precision pumps for chemical and semiconductor industries
  • Turbo-molecular pumps for vacuum industries
  • High-speed motors for machining
  • Turbochargers
  • Actuator motors in electric vehicles
  • Turbines

Problem Addressed

Several chemical and biological processes require pumps to transport delicate fluids such as biological and chemical reagents. In these sensitive processes, usage of traditional pumps can lead to potential contamination of the transport fluid with the pump lubricants. Moreover, the properties of the transport fluid can be changed due to the stress and heat developed in a conventional pump.


This technology uses a self-bearing hysteresis motor as the electromechanical device that transforms the input electric power to output mechanical power in a rotational form in order to pump the fluid. The pump impeller is magnetically levitated and rotates without any mechanical connections such as bearings and shafts. Absence of permanent magnets or saliency features in the pump results in reduced manufacturing cost as well as lower vibration level during the operation.


  • Low cost
  • Low vibration
  • Zero contamination of the process fluid with the pump lubrication
  • Reduced mechanical stress and heat on the process fluid
  • Disposable impeller modules
  • High rotational speed can be achieved
  • Low operating power for the levitation mechanism