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    • 11. 发明申请
    • HEAT TREATMENT OF METAL WORK PIECES
    • 金属工件的热处理
    • WO2006111252A8
    • 2007-11-15
    • PCT/EP2006002842
    • 2006-03-29
    • IPSEN INT GMBHJURACK MARIO
    • JURACK MARIO
    • H02P1/26F27B5/06F27B5/18H02P25/18H02P25/22
    • F27D9/00F27D2009/0072H02P1/26H02P25/18H02P25/22
    • The invention relates to a method for heat-treating metal work pieces, whereby a cooling gas flow is produced in a vacuum furnace by means of a fan, driven by a three-phase AC motor, in order to quench the work pieces. The aim of the invention is to improve the heat treatment of metal work pieces in such a manner as to improve the quenching in a simple and inexpensive manner. For this purpose, the three-phase AC motor comprises first three-phase windings designed for a lower supply voltage and second three-phase windings designed for a higher supply voltage. The three-phase AC motor is operated with the first three-phase windings until a minimum pressure defined in terms of the motor output is reached in the vacuum furnace and with the second three-phase windings until a minimum pressure defined in terms of the motor output is reached or exceeded in the vacuum furnace.
    • 本发明涉及一种用于热处理的金属工件,其中,冷却气体的流动是在真空炉中产生,用于通过旋转动力马达风扇驱动的发电机淬火工件的方法。 为了开发金属工件的热处理以这样的方式,有可能以简单和成本有效的方式来实现一种改进的威慑,本发明提出的是,交流电机为一个较低的电源电压设计的第一三相绕组,和一个更高的电源电压设计的第二三相绕组,所述三相电动机的 达到对于在使用所述第一三相绕组的真空炉其电机功率一定的最小压力,并且在达到或超过在真空炉中其发动机功率最小压力的特定术语被使用第二三相绕组运行。
    • 13. 发明申请
    • METHOD FOR CONTROLLING THE STARTING OF AN AC INDUCTION MOTOR UTILIZING CLOSED LOOP ALPHA CONTROL
    • 用于控制闭合环路ALPHA控制的交流感应电动机起动的方法
    • WO0189072A3
    • 2002-03-28
    • PCT/GB0102179
    • 2001-05-18
    • EATON CORPEATON LTD
    • GRITTER DAVID JAMESWANG DORA YUAN
    • H02P1/26H02P1/28
    • H02P1/26
    • A method is provided for controlling a three-phase, AC induction motor (12). Each phase of the AC induction motor (12) is connected to an AC input source (18) by a thyristor switch (22a-22c) and a bypass contactor (24a-24c) connected in parallel in order to provide voltage and current to the AC induction motor (12). The method includes the steps of sequentially firing pairs of thyristor switches (22a-22c) at a predetermined initial alpha firing angle. A new alpha firing angle is calculated which is dependant upon the initial alpha firing angle. Thereafter, pairs of thyristor switches (22a-22c) are fired at the new alpha firing angle. The new alpha firing angle is provided as the initial alpha firing angle and a new alpha firing angle is calculated. The process is repeated until the AC induction motor (12) reaches its full operating speed.
    • 提供一种用于控制三相AC感应电动机(12)的方法。 交流感应电动机(12)的每个相通过并联连接的晶闸管开关(22a-22c)和旁路接触器(24a-24c)连接到交流输入源(18),以便将电压和电流提供给 交流感应电动机(12)。 该方法包括以预定的初始α触发角顺序地点击成对的晶闸管开关(22a-22c)的步骤。 计算一个新的α点火角,这取决于初始的α点火角。 此后,以新的α触发角度对成对的晶闸管开关(22a-22c)。 提供新的α触发角作为初始α触发角,并计算新的α触发角。 重复该过程,直到AC感应电动机(12)达到其完全运行速度。