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  • Users: fhuang
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  1. fhuang

    resistor in parallel with transistor base_emitter

    why a resistor is added in parallel with a transistor base-emitter. e.g., a transistor is driven through a 10k at its base and between base and emitter another 10k is connected in parallel?
  2. fhuang

    why motor power loss is different during motoring and regenerating?

    It was realized that both 30kW induction and 100kW PM motor have different power loss during motoring and regen. It seems that regen has about 10% higher loss. The measurement was carried out such that DC bus voltage and current were controlled at fixed value, for motoring the dc current is out...
  3. fhuang

    difference between op-amps and comparitors

    Please advise on the difference between op-amps and voltage comparitors. Can a comparitor be used as op amp or vise verse?
  4. fhuang

    winding inductance of cage type induction motors

    In general,what is the range of winding inductance of cage type induction motors with power of 100kW to 150kW for traction application?
  5. fhuang

    winding inductance of induction motors

    In general,what is the winding inductance of cage type induction motors in the range of 100kW to 150kW for traction application?
  6. fhuang

    SMPS coupled output inductors

    a two-transistor forward converter has two outputs - 15V and 24V. The two outputs have coupled output inductors. Please explain how the coupled output inductors improve the output cross regulation, reference preferred.
  7. fhuang

    induction motor braking torque

    An induction motor is controlled with vector-control algorithm. Keeping Id constant, if the polarity of Iq is changed from '+' to '-', the motor torque should change from motoring to regenerating. Theoretically, if /Iq/ is the same, the torque, /T/, should be the same. The polarity of Iq only...

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