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Power Electronics for Active Magnetic Bearings

Power Electronics for Active Magnetic Bearings. Introduction. Reference. Electromagnets + Mechanics. Power Circuits. Controller. D/A converter. Displacement Sensors. A/D converter. Conditioners. Digital Control. Introduction. Applications Compressor Gas Turbine Motor Turboexpander

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Power Electronics for Active Magnetic Bearings

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  1. Power Electronics for Active Magnetic Bearings

  2. Introduction Reference Electromagnets + Mechanics Power Circuits Controller D/A converter Displacement Sensors A/D converter Conditioners Digital Control

  3. Introduction • Applications • Compressor • Gas Turbine • Motor • Turboexpander • Offshore Power Electronics

  4. 3 4 1 1 6 2 5 2 AMB control system 3 4 5 6 torque control total : 6 freedom degrees machine 5 AMB axis control

  5. Analog Circuits R = resistor, L = inductance, C = capacitor. • Transistors operating in the active mode. Iamb = K * Ib1

  6. Analog Circuits • Push Pull circuit: Vpos= V+ Vneg= V- Bipolar Output Currents

  7. Analog Circuits • Improved Push Pull circuit: Vpos= V+ Vneg= V- Bipolar Output Currents

  8. Analog Circuits • Operational Amplifiers Vout = Gain * [(+v) – (-v)] Ideal Gain = infinite Input Impedance = infinite Using auxiliary passive components, different transfer functions can be implemented, by instance: Kp, Kp(1 + Td*s), Kp(1+Ti/s), …

  9. Analog Circuits

  10. Digital Circuits Combinational circuits: logical gates, encoders, multiplexers, etc Sequential circuits: flip-flops, counters, memories, etc Hybrid circuits: Analog-Digital converter Digital-Analog converter

  11. Power Circuits • Linear Type: Use of opamp´s and power transistors: BJT,Mosfet,IGBT • Switched Type: two states of operation: on (short) and off (open)

  12. Switched Power Circuits

  13. Switched Power Circuits

  14. Switched Power Circuits

  15. Switched Power Circuits

  16. Switched Power Circuits

  17. Switched Power Circuits

  18. Switched Power Circuits

  19. Switched Power Circuits To be continued

  20. Application in compressorsHP=High pressure , LP=Low pressure

  21. Application in compressorsHP=High pressure , LP=Low pressure

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