Technical feasibility


SECTION I: Testing


1 Has the R & D result been tested?







The following question is replied according to the reply in question 1


If yes

1a In what mode has the result been tested?

•              Prototype

•              Pilot Application

•              Alpha/BETA testing

•              Prototype
1b. Please describe and discuss the testing results

1. Verification of  materials, subassemblies and apparatus

2. Verification of shape, dimensions, weight

3. Verification of operation when starting the electric motor

4. Verification of operation when stopping the electric motor

5. Verification of operation at 5000 coupling-decoupling manoeuvres

6. Verification of protective coats



SECTION 2: Current Stage of Development


2a To what extent does the development team have technical resources for supporting the production of a new product? (Researchers, human resources, hardware, etc. )

The product is in course of manufacturing at ICMET Craiova, Development of Products, Models and Prototypes section.


The research development which designed, achieved and tested the prototype has the human resources for advising technically the product manufacturing. The team is composed of mechanical engineers for applied research and engineers specialized in electric drives. The project team has also the specialists necessary for adapting the electromechanical system for coupling-decoupling automatically the brushes of induction motors at all the types and sizes of known induction motors.




2b What are the technical issues that need to be tackled for full deployment, if needed?

Every producer of electrical rotating machines has its own constructive solutions for the induction motors with slip rings. For the deployment of the electromechanical system for coupling-decoupling automatically the brushes of the induction motors for a certain producer of electrical machines, it is necessary to adapt to each motor separately the attachment flange and the bonnet for mounting the product. The adaptations are minor and do not require to solve some special technical issues.


2c What additional technical resources are needed for the production of this new product?

Additional technical resources are necessary for re-designing the holding device of the electromechanical system for coupling-decoupling automatically the brushes, related to the induction motor shield and bonnet.




2d Overall assessment of the current stage of technical development.

The product was certified and 64 electromechanical systems were executed for coupling – decoupling automatically the brushes of the induction motors, in 6 types and sizes, for SC Electroputere SA, Electrical Rotating Machines division. The systems were adapted to the types of motors designed and built by this producer. No designing or execution deficiency has been reported for these systems.






SECTION 3: Deployment

3a Define the demands for large scale production in terms of

  • Materials

- Electric actuators

- Brushes

- Round steel, different diameters

- Steel sheets, different thicknesses

- Bearings, safety rings for shaft and bore

- Fasteners (screws, nuts, washers)

  • technologies, tools, machineries

The used technologies are classical technologies for mechanical working (punching in coordinates, facing, milling, drilling, threading, grinding, electrochemical coating with zinc).


- coordinate punching machine

- flanging press

- lathes

- milling machine

- drilling machine

- interior and exterior grinding machine

  • Staff effort

The human resources will be determined depending on the production volume.

The labour volume necessary for executing a product is about 125 hours.


SECTION 4: Overall Assessment

1 What is you overall assessment of the technical feasibility of the research result?

The technical characteristics of the product were certified by testing the prototype, in accordance with the company standard.

The technical characteristics of the electromechanical system for coupling-decoupling automatically the induction motor brushes are:

- Mechanism driving speed:                          1.5 rot/min

- Electric motor power:                                   90 W

- Driving time:                                                   26 sec / 240°

- Supply voltage:                                             3 x 380 V, 50 Hz

- Actuator output torque:                              125 Nm

- Number of brushes / slip ring:                      2 or 4 pcs.

- Brush pressing force:                                     2.2 kgf

- Operating temperature:                             –25° C  +55° C

- Electric actuator protection degree:        IP 65

- Driving position:                                            horizontal or vertical

- Driving duration:                                           S 2 , 10 min ; S4, 25%

The execution of the prototype and its testing proves that the product is feasible and the product is technologically achievable in the required quality conditions.

The endurance test on the testing stand at 5000 coupling-decoupling manoeuvres, also the tests under real operating conditions proved the special reliability of the product.

No additional research is necessary; the only re-designing activities will be related to the product adaptation for its mounting on different types and sizes of electric motors with slip rings.

The overall  self-assessment of the technical feasibility is 5.



Please put X as appropriate.

  1 2 3 4 5
Adequacy of testing activity undertaken so far

Adequacy and availability of technical resources of the development team

Current development stage

Overall technical feasibility



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