Request for Proposal
Status: RFP is Closed

Simplification of a Bearingless Motor System

Request Number
Due Date
Mar 14
Program Manager


Joint development, licensing, supplier agreement



Phase 1 – Establishment of the technology via a prototype - By October 2020

Phase 2 – Development for commercialization - By March 2021



Necessary development expense will be covered

(Details to be discussed).


How to  Apply
Click on "Respond", complete the form to the extent possible, and submit along with other attachment files available. 
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RFP was closed on
Mar 2019

RFP Title


Simplification of a Bearingless Motor System
RFP Description

NineSigma, representing a global manufacturer, seeks technologies or ideas that can simplify a system of bearingless motor, for cost reduction. Proposals related to the components such as bearingless motor itself, thrust bearing, and control of the system are widely welcome. (Concept-level proposals are also welcome.)

Key Success Criteria

Background and challenges

For a certain purpose, the client is examining the below system to realize five-axis magnetic levitation:

  • Configuration: Two bearingless motors + Actively controlled thrust magnetic bearing
  • Motor output: 70 kW
  • Motor speed: 45,000 rpm
  • Motor efficiency: 97% or more
  • Full length of the rotor: 500 mm
  • Weight of the rotor: 8 kg
  • Applied loads
    • Radial load: Rated 250 N
    • Axial load: Rated 2,000 N


 Overview of the system that the client is examining

Possible Approaches

Requirements of this open request

The client seeks technologies or ideas that can simplify the above system, which the client is currently examining, for cost reduction. Note that motor output, speed, efficiency, and load should satisfy the above specification. (Shorter length and lighter weight of the rotor are better)

The followings are examples of the anticipated approaches, however proposals are not limited to these.

  • With regard to bearingless motors
    • Reduce the number of bearingless motors. The moment around the center of gravity of the rotor generated by the load should be suppressed even with one bearingless motor.
    • Change the architecture of the bearingless motor itself to an inexpensive one.
    • Replace general three-phase inverters used for the bearingless motors with cheaper ones
    • Omit the rotation angle sensor(s) mounted on the bearingless motor
  • With regard to thrust bearings
    • Replace a part of the thrust bearing with a passive magnetic bearing using permanent magnet
    • Reduce the number of amplifier bridges
  • Other
    • Omit the shaft position sensor

Since the level of the above requirements are challenging, proposals are not required to satisfy all requirements. The client also welcomes proposals  that can be established via a prototype through one to two years of development.

Items to be Submitted

Notes on Response

Proposal shall have clear points and should not include confidential information. Supplemental files may be submitted in addition to the proposal.


Response evaluation

The client will evaluate all responses with the following criteria.

  • Overall scientific and technical merit
  • Approach to proof of concept or performance
  • Economic potential of concept
  • Realism of the proposed plan (action items, timeline, roles, deliverables, cost estimation)
  • Potential for proprietary position
  • Respondents’ capability and related experiences


Anticipated Project Process

After reviewing submitted proposals, the client possibly ask clarifying questions before selecting the most suitable candidates for collaboration. The client will select best candidates through evaluations. During the selection process, the client may execute NDA with selected respondents, seek further information disclosure, and discuss specific development targets or potential opportunities.

The client will execute necessary agreements with the selected respondents and move to the advanced development phase. Specifics of any collaboration will be determined through consultation with the concerned parties

Preferred Collaboration Types
Area of Interest