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1. 发明授权

US08645087B2 Measuring of earth fault current 有权
标题翻译：测量接地故障电流
公开(公告)号：US08645087B2
公开(公告)日：2014-02-04
申请号：US13088979
申请日：2011-04-18
申请人： Andreas Doktar , Stefan Strandberg
发明人： Andreas Doktar , Stefan Strandberg
IPC分类号： G01R31/00
CPC分类号： G01R31/00 , G01R31/025 , G01R31/42 , H02M1/32 , H02M7/53873 , H02M7/5395 , H02M2001/0009
摘要： Method and apparatus for measuring an earth fault current in an output circuit of an inverter (INU) operating on the PWM principle and forming alternating-current voltage from direct-current voltage, the output currents (iU, iV and iW) of which inverter are measured, and which inverter comprises at least two phase switches implemented with power semiconductor components (V1-V6, D1-D6), which switches, controlled by a control unit, connect their own output phases to a positive (+) pole and to a negative (−) pole of a direct-current voltage source such that the phase switches are repeatedly both in different positions and also in the same positions, wherein the results of current measurement during two opposite switch position combinations are recorded in memory, and the earth fault current is calculated by forming a difference of the measurement results of said combinations.
摘要翻译：用于测量基于PWM原理的逆变器（INU）的输出电路中的接地故障电流的方法和装置，并且形成来自直流电压的交流电压，反相器的输出电流（iU，iV和iW）并且哪个逆变器包括由功率半导体部件（V1-V6，D1-D6）实现的至少两个相位开关，其由控制单元控制，其将它们自己的输出相连接到正（+）极和至直流电压源的负极（ - ）极，使得相位开关在不同的位置和相同的位置重复地进行，其中在两个相反的开关位置组合期间的电流测量的结果被记录在存储器中，并且接地通过形成所述组合的测量结果的差来计算故障电流。

2. 发明授权

US08350506B2 Frequency converter start-up 有权
标题翻译：变频器启动
公开(公告)号：US08350506B2
公开(公告)日：2013-01-08
申请号：US12752495
申请日：2010-04-01
申请人： Andreas Doktar , Stefan Strandberg , Jaakko Ollila
发明人： Andreas Doktar , Stefan Strandberg , Jaakko Ollila
IPC分类号： H02P6/20
CPC分类号： H02P6/14 , H02M1/36 , H02P6/16 , H02P27/08 , H03K17/06
摘要： Method and apparatus to start a frequency converter equipped with a direct current intermediate circuit, particularly when a permanent magnet motor whose rotor is rotating at the start-up time is connected to it, wherein the frequency converter has a network bridge (10) and load bridge (11), and the load bridge has controllable power semiconductor switches of the upper and lower branch (V1-V6) and parallel connected zero diodes (D1-D6), and a direct current intermediate circuit between them, and the said frequency converter uses a current transducer placed in the direct current intermediate circuit, and the analogue current signal composed by it features samples of the measured output currents, and the diverter switches of the frequency converter's upper branch are controlled using the bootstrap method, wherein start-up is initiated by controlling the controllable power semiconductor switch of the lower branch of at least one output phase to a conductive state for one or several periods of time, preferably of approximately 200 μs, at a time.
摘要翻译：特别是当转子在启动时旋转的永磁电动机与其连接时，启动配备有直流中间电路的变频器的方法和装置，其中变频器具有网桥（10）和负载桥（11），负载桥具有上，下分支（V1-V6）和并联零二极管（D1-D6）的可控功率半导体开关及其间的直流中间电路，所述变频器使用放置在直流中间电路中的电流传感器，由其组成的模拟电流信号具有测量的输出电流的样本，并且使用引导方法来控制变频器的上部分支的切换开关，其中启动是通过将至少一个输出相的下分支的可控功率半导体开关控制到导通状态来启动一个或多个周期时间，优选约200μs。

3. 发明授权

US08734120B2 Compressor starting method and apparatus 有权
标题翻译：压缩机起动方法及装置
公开(公告)号：US08734120B2
公开(公告)日：2014-05-27
申请号：US13296904
申请日：2011-11-15
申请人： William Giewont , Todd Snider , Andreas Doktar
发明人： William Giewont , Todd Snider , Andreas Doktar
IPC分类号： F04B49/06 , F04B35/04
CPC分类号： F04B49/06 , F04B35/04 , F04B2203/0201 , F04B2203/0207 , H02P6/22 , H02P21/34
摘要： A piston type compressor wherein the position of the piston highest pressure point is indicated and the rotor of the motor at the optimal starting angle aligned prior to the actual compression operation by providing a pre-pulse to rotate the rotor of the motor at least one full rotation at a certain frequency, during rotation measuring the load torque by the frequency converter as well as indicating the maximum load torque point and at the end aligning the rotor of the motor at the optimal starting angle of about 180° from the maximum pressure angle, and 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.
摘要翻译：一种活塞式压缩机，其中指示活塞最高压力点的位置，并且在实际压缩操作之前以最佳起始角对准的电动机的转子通过提供预脉冲来使电动机的转子至少一个满在一定频率旋转时，通过变频器测量负载转矩以及指示最大负载转矩点，并在最终以最大压力角约180°的最佳启动角度对齐电动机的转子，并且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，并且通过向电动机提供最大电动机电流来启动电动机以给出最大转矩和加速度。

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