"Upgrade of the HSX Motor/Generator system for Operation at B=1.25 T"*

HSX is being upgraded for high power ECRH operation at 70 GHz. The motor/generator system is modified to drive 50% more power to provide the needed magnetic field of B=1.25T. This results in increasing the speed of operation and the number of modular units in the system. The control system is being upgraded with a new control program and operating sequence of the motor/generator units to achieve the upgraded parameters. Upgrades also include temperature management and dual method speed measurement of the units for added safety and reliable operation. Vibration sensors have been installed with functionality of long-term spectral analysis to monitor bearing health for additional safety and to predict failure. Bearing defects manifest as impulses at frequencies related to bearing geometry. High harmonics are observed via filtering and envelope to increase SNR. Fault detection and alarm mechanisms are being added to increase system visibility and to minimize mean time to recovery. In addition, the safety system of the machine is being upgraded to a category 3 safety system. All modular units have been rebuilt, recommissioned and have been tested at upgraded parameters. Results of testing, design changes, and operation will be presented.