Design and Voltage Supply of High-Speed Induction - Aaltodoc
Design and Voltage Supply of High-Speed Induction - Aaltodoc
Design and Voltage Supply of High-Speed Induction - Aaltodoc
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52<br />
5 COMPARISON OF ROTORS FOR 60 KW 60000 1 /MIN HIGH-SPEED MOTOR<br />
In this chapter, a copper coated solid steel rotor <strong>and</strong> two solid steel squirrel cage rotors are<br />
compared. The rotors were introduced in Sections 3.2 <strong>and</strong> 3.5. The solid steel squirrel cage rotors<br />
were designed to combine the mechanical properties <strong>of</strong> a solid steel rotor <strong>and</strong> the electromagnetic<br />
properties <strong>of</strong> a squirrel cage rotor. The comparison was made for a 60 kW 60000 1 /min motor. The<br />
tests were done having two identical motors coupled ‘back-to-back’ with a flexible coupler. The<br />
back-to-back test setup <strong>and</strong> the rotors tested are shown in Fig. 5.1.<br />
During the measurements, there was a specific opportunity to measure the rotor surface temperature<br />
on-line. The temperature was measured with an infrared camera via the cooling duct dividing the<br />
stator stack. Only the exhaust pipe <strong>of</strong> the cooling air had to be removed. This is done to the motor<br />
on the right in Fig. 5.1. The figure also shows a stripe <strong>of</strong> paint at the surface <strong>of</strong> the rotors, painted<br />
for the temperature measurement purposes.<br />
Power 60 kW<br />
<strong>Voltage</strong> 400 V<br />
<strong>Supply</strong> VSI<br />
<strong>Speed</strong> 60000 1 /min<br />
Stator winding 3 phase, full pitch<br />
Stator connection YY<br />
Stator slots 36<br />
Parallel paths 2<br />
Poles 2<br />
Insulation class F<br />
Cooling Forced air cooling<br />
Bearings AMB<br />
Load Back-to-back<br />
Fig. 5.1 A photograph <strong>and</strong> data <strong>of</strong> the 60 kW 60000 1 /min high-speed motors coupled with a<br />
flexible coupler. From left to right, 16 bar, coated <strong>and</strong> 26 bar rotors.