Development of Ultra High Speed Generator ; Motor and Drive System

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Resent developments of power electronics technology, low-loss iron core materials and highly efficient permanent magnet, etc have made it possible to realize a small size, ultra-high speed, high performance electrical drive system. Such drive is expected for various kinds of applications such as co-generation system, electrical vehicle and compressor, in which small size, light weight and high efficiency are required. The aim of this research is to establish optimal design for ultra-high speed motor-generator system. Research results are summarized as follow ;(1)We designed and built a proto-type 5kW, 30,000rpm ultra-high speed drive system. The system consists of (i)a control part which uses DSP TMS320C32, (ii)a power supply part using a matrix converter and a PWM controlled voltage source inverter and (iii)a ultra high speed PM motor. An oil circulation system is used for the shaft bearing and the cooling of the motor.(2)As the motor size is too small to mount a rotor position encoder, position or speed sensor-less control is necessary. Therefore, we introduce "improved V/f constant control". In addition, stabilization routine to avoid system instability and high efficiency control loop to minimize stator currents is installed in the DSP program,.(3)The eddy current analyses were examined to evaluate the motor design parameters by using FEM. The teeth width of the stator is effective for the eddy current. The power loss and induced eddy current in the inconel-718 are decreased according to increase of the teeth width. These analytical results were reflected to the motor design.(4)The computer simulation model was created to evaluate and enhance the total drive system, which consists of three parts ofsubsystem such are represented "C model" for DSP system, "Analog component" for matrix converter and inverter-converter system and "Equivalent Circuit Model" for motor.