SVIBOR - Project code: 2-05-377


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


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Project code: 2-05-377


Main researcher: SMOLČIĆ, ZLATKO (105403)

Type of research: developmental
Duration from: 10/01/91. to 10/01/94.

Papers on project (total): 13
Institution name: Končar, Institut za elektrotehniku, Zagreb (8)
Department/Institute: Department of rotating machines
Address: Baštijanova bb
City: 10000 - Zagreb, Croatia
Phone: 385 (0)1 315201
Phone: 385 (0)1 318425
Fax: 385 (0)1 318815
Fax: 385 (0)1 333088

Summary: Developmental research is caried out. Improved computer programfor more precisely electromagnetic, heat-ventilating calculation,calculation of noise are created. Testing of three-phazeinduction motors is advanced by using of computer. Research anddevelopment of insulation system in respect to supply andecological requirements is carried out. Study of tecnicalcharacteristics and test results of motor samples of foreignmanufacturers is carried out and proposal for technicalrequirements for the new series of three-phase squirrel-cage andslipring induction motors is given.Prototypes of squirrel-cageinduction motors for three shaft-heights with differentpolarities and degrees of protection are manufactured, tested andlaboratory verification is carried out. The conception of modern, export competitive, series ofthree-phase squirrel-cage induction motors with the new powerrange from 11 to 450 kW is defined on the base of the abovementioned developmental research. The series contain 7standardized shaft-heights according to IEC regulations. The series is intended for the new voltage and tolerances ofdistribution system, conformed to power supply conditions andfrequency converters by controlled drives. The series hasimproved economic parameters and ecological properties.

Keywords: three-phase low-voltage squirrel-cage induction motor, aluminum squirrel-cage rotor, low-voltage, insulation system, technical requirements, electromagnetic calculation, heat-ventilating calculation

Research goals: For saving the competitive position in production and sale on the world market in regard to the new supply voltage 230/400V +10% -10%, properties and prices are the main purpose of research. Increased demands of the world market on technical, economic, energetic, ecological features and price of electric-motor require investigations of definite physical phenomena, study of using, saving tehnologies, manufacturing testing of prototypes and various analyzes. For realisation of those aims the conception of series of tree-phase squirrel-cage induction motors must be radically changed. The main contribution of research and development is adoption of domestic export competitive production of low-voltage squirrel-cage induction motors. The new series contains drip proof motors with shaft height 180-315 mm, power range from 11 to 450 kW and totally enclosed motors 200-355 mm shaft heights, power range 15 to 315 kW. Motors will be suitable for controlled drives and accommodate to inverter feeds conditions (saving energy). Motors will have improve economic parameters. They will be ecological favorable because of lower noise level and vibrations, as well as removing undesirable insulation materials. The main aim and expected contibution of research is realised by essential improvements of quality in design, construction, manufacturing and testing of induction motors for world market.

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Last update: 09/21/95