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Figure 3-15: Photo of the PM stator for the supercritical CO2 compression loop. For the long term tests, SNL modified the autoclave to include electrical feed throughs in the lid of the pressure vessel. This then allowed SNL to check for electrical resistance changes to the stator over a long period of time. The tests results have shown that over a period of over 3 months, there have been no measurable resistance changes to the stator windings. These tests have currently been stopped, and SNL will use the electrical meter to observe the behavior in the actual stator. The motor/alternator controller is shown in Figure 3-16. This device has operated the motor at power levels approaching 50 kWe and at speeds up to 65,000 rpm. The hardware was designed to motor at 50 kW and produce up to 150 kWe as an alternator. It uses some commercial switching circuits to drive the three phase motor or to load the alternator. The switching circuitry uses IGBT transistors, and pulse width modulation to drive the motor. The motor/generator needs a zero crossing signal to tell the circuit when to reverse the polarity of the voltage that is applied to the stator. This sensor was originally intended to be a speed proximity sensor, but this device did not work well as it was noisy. Instead a simple coil that was imbedded in the stator was used as the speed sensor. The operation of this variable speed motor controller has taken considerable time to work through a number of issues such as how to start the motor, especially on gas foil bearings, how to keep the speed sensor free from noise, when to shift to speed control, and how to deal with internally sensed faults such as over temp or sensed shorts. The motor controller has sensed two faults in the electrical feed throughs. These have sense been replaced with higher voltage capable feed throughs. 36PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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