| Summary: | 碩士 === 南臺科技大學 === 電機工程系 === 105 === Based on FPGA (Field Programmable Logic Gate Arrays),designs of the driving circuit design for active magnetic bearing system with ten sets of coils in this thesis. This magnetic bearing system is mainly composed of two sets of coil control of the axial magnetic bearing, eight sets of coil control of the radial magnetic bearing and a group of induction motor. In order to accurately control the location of the magnetic spindle under high speed operation, the magnetic bearing system uses ten sets of coils and twelve sets of position sensors. Ten sets of coils will be actuated by five groups of drive circuit modules. Each module will be Mitsubishi's intelligent power module (IPM) as the main body, and with the current sensor, bootstrap (Bootstrap) circuit, analog digital converter (ADC), optical coupling isolation circuit constituted by the circuit. Each module can drive two sets of coils. The five drive circuits will be connected to an FPGA control board. FPGA control board is used for ten sets of coil current control and receive from the ten sets of coil current value through the ADC signal. Further, the current controllers will generate five sets of PWM(Pulse width modulation) signal to accurately control the current required for ten groups of coils. The current controllers use PI controller. Because the active maglev system requires multiple sets of drive actuators, the use of FPGA chip is very suitable, due to it has a parallel processing power, fast computing and hardware and software common design advantages. Finally, this thesis will construct a set of experimental systems, including FPGA development board, drive board, A/D conversion circuit, magnetic bearing simulation system to verify the correctness and effectiveness of the proposed driving system.
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