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    • 1. 发明公开
    • Compressor starting method and apparatus
    • Verfahren und Vorrichtung zum starten eines Kompressors
    • EP2595306A2
    • 2013-05-22
    • EP12187781.5
    • 2012-10-09
    • Vacon Oyj
    • Giewont, WilliamSnider, ToddDoktar, Andreas
    • H02P1/04
    • F04B49/06F04B35/04F04B2203/0201F04B2203/0207H02P6/22H02P21/34
    • A method of and an apparatus for starting a piston type compressor (C) driven by a permanent magnet synchronous motor (M) controlled by a frequency converter (FC), the method comprising at least following steps:
      a) indicating the position of the piston highest pressure point and aligning the rotor of the motor (M) at the optimal starting angle prior to the actual compression operation by
      providing a pre-pulse to rotate the rotor of the motor (M) at least one full rotation at a certain frequency (f 2 ),
      during rotation measuring the load torque by means of the frequency converter as well as indicating the maximum load torque point and
      at the end aligning the rotor of the motor (M) at the optimal starting angle of about 180° from the maximum pressure angle, and
      b) at the beginning of the actual compression operation
      setting the rotor position opposite to the maximum torque angle by feeding direct current to the stator winding and
      starting the motor by supplying maximum motor current to the motor to give the maximum torque and acceleration.
    • 一种用于启动由变频器(FC)控制的永磁同步电动机(M)驱动的活塞式压缩机(C)的方法和装置,所述方法至少包括以下步骤:a)指示活塞的位置 最高压力点,并且在实际压缩操作之前以最佳起始角对准电动机(M)的转子,通过提供预脉冲以使电动机(M)的转子以特定频率至少一个完整旋转( f 2),在通过变频器测量负载转矩以及指示最大负载扭矩点的旋转期间,并且在最终以最大起始角度(最大起始角度)约180°的方向对齐电动机(M)的转子 压力角和b)在实际压缩操作开始时,通过向定子绕组馈送直流电而将转子位置设置为与最大扭矩角相反,并且通过将最大电动机电流提供给 电机给出最大的扭矩和加速度。
    • 5. 发明公开
    • Protection of power semiconductor components
    • 功率半导体器件的保护
    • EP1583197A3
    • 2011-09-21
    • EP05075651.9
    • 2005-03-18
    • Vacon Oyj
    • Norrena, JuhaKomulainen, Risto
    • H02H6/00H02H7/12
    • H02H6/005H02H7/1216
    • A method and a system for protecting the power semiconductor components used in the power stages of power electronics devices, such as frequency converters, wherein calculation modeling the degree of heating of the semiconductor junction of the power components (V11-V16) is used, wherein the degree of heating of the power components between the measurable outer surface or cooler and the internal semiconductor junction is determined on the basis of the dissipation power and a thermal network model of the component, wherein the temperature of the outer surface of the power component or the temperature of the cooler is measured, wherein the modeled temperature of the semiconductor junction is the sum of the measured temperature of the outer surface or cooler and the calculated degree of heating, and wherein, based on the modeled junction temperature, an alarm is issued or some other protective action is taken. In the method, the temperature of the semiconductor junction is calculated in real time, at least at time intervals equal to the shortest time constant in the thermal network model, on the basis of the heating caused by the dissipation power pulse produced during each current conduction cycle.