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1.发明授权Method and system of controlling asynchronous contactors for a multi-phase electric load 有权控制多相电力负载异步接触器的方法和系统公开(公告)号：US07224557B2
公开(公告)日：2007-05-29
申请号：US10859507
申请日：2004-06-02
IPC分类号： H02H3/08
摘要： Control of an induction motor is carried out to limit damaging arcing stress and mechanical stresses placed on the control contactor assembly and the induction motor resulting from the simultaneous or synchronous breaking and making of contactors employed to connect the windings of the motor to a power supply. Asynchronously connecting the windings to the power supply via the asynchronous or non-simultaneous closing of the contactors of a modular contactor assembly reduces the potentially damaging transient current, the associated torque oscillations, and mechanical stresses. The present invention is particularly applicable to delta motors that are started with its windings in a star or wye configuration followed by the reconnection of the windings in a delta configuration when the motor is at normal running speed.
摘要翻译： 执行感应电动机的控制以限制由于同时或同步地断开和制造用于将电动机的绕组连接到电源的接触器而导致的控制接触器组件和感应电动机上施加的损坏的电弧应力和机械应力。 通过异步或非同时关闭模块化接触器组件的接触器将绕组异步连接到电源减少潜在的破坏性瞬态电流，相关联的扭矩振荡和机械应力。 本发明特别适用于以马达处于正常运行速度时以三角形配置重新连接绕组的星形或者叶状配置的绕组开始的三角马达。
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2.发明授权Method and apparatus for detecting current delay angle from motor terminal voltage 失效从电机端子电压检测电流延迟角的方法和装置
公开(公告)号：US5627447A
公开(公告)日：1997-05-06
申请号：US536728
申请日：1995-09-29
申请人： Peter J. Unsworth , Jinghan Tao
发明人： Peter J. Unsworth , Jinghan Tao
CPC分类号： H02P23/26
摘要： A method and apparatus to be used with an inverter based motor controller for determining current phase angles for the current on a single phase of a three phase AC motor from an inverter generated high frequency phase voltage sequence. The invention detects turn on delay periods and compares phase voltages during consecutive turn on delay periods to determine phase current zero crossing times which can be used along with phase voltage zero crossing times to derive current phase angle information.
摘要翻译： 一种用于基于逆变器的电动机控制器使用的方法和装置，用于从逆变器产生的高频相电压序列确定三相交流电动机的单相上的电流的电流相位角。 本发明检测接通延迟周期并比较连续导通延迟周期期间的相电压，以确定可以与相电压过零时间一起使用的相电流过零时间以导出当前相位角信息。
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公开(公告)号：US4862052A
公开(公告)日：1989-08-29
申请号：US165538
申请日：1988-03-08
CPC分类号： H02P3/18
摘要： An electric motor is braked by sensing the polarity of voltage of the alternating electricity for powering the motor and sensing the polarity of the voltage induced in the motor by the back electromotive force. When these polarities are opposite the electricity is applied to the motor to generate a braking torque. The application of the electricity is stopped a given interval after it begins to be applied during consecutive voltage cycles. This interval is derived from the time period between when braking commenced to when the electricity was applied during consecutive cycle.
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公开(公告)号：US06757665B1
公开(公告)日：2004-06-29
申请号：US09407617
申请日：1999-09-28
IPC分类号： G06E300
CPC分类号： G06N3/088 , F04D15/0077 , F04D15/0088 , F04D29/669 , G01R31/2846 , G01R31/343 , G06N5/048 , Y10S706/904 , Y10S706/905 , Y10S706/906 , Y10S706/907
摘要： A system and method is provided for monitoring the operating condition of a pump by evaluating fault data encoded in the instantaneous current of the motor driving the pump. The data is converted to a frequency spectrum which is analyzed to create a fault signature having fault attributes relating to various fault conditions associated with the pump. The fault signature is then input to a neural network that operates in conjunction with a preprocessing and post processing module to perform decisions and output those decisions to a user interface. A stand alone module is also provided that includes an adaptive preprocessing module, a one-shot unsupervised neural network and a fuzzy based expert system to provide a decision making module that operates with limited human supervision.
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公开(公告)号：US06636823B1
公开(公告)日：2003-10-21
申请号：US09409452
申请日：1999-09-30
申请人： Peter J. Unsworth , Muslum Arkan
发明人： Peter J. Unsworth , Muslum Arkan
IPC分类号： G01R3100
CPC分类号： G01R31/343
摘要： A method and apparatus for detecting a stator winding fault in an induction motor includes sampling instantaneous signals from the motor and then deriving sequence components of at least some of the instantaneous signals using a power decomposition technique (PDT), one of the sequence components being a total negative sequence current component. In addition, the method includes calculating an expected negative sequence current based on at least some of the sequence components. Thereafter, the method subtracts the expected negative sequence current from the total negative sequence current to determine a fault negative sequence current, wherein the fault negative sequence current is indicative of the fault. More preferably, the method additionally includes calculating an intrinsic motor negative sequence current based on at least some of the sequence components, and subtracting the intrinsic motor negative sequence current from the fault negative sequence current generated as described above to determine a modified fault negative sequence current. Notably, the method and apparatus are capable of detecting faults that cause a modified fault negative sequence current as low as approximately 0.2% of the full load current.
摘要翻译： 用于检测感应电动机中的定子绕组故障的方法和装置包括从电动机采集瞬时信号，然后使用功率分解技术（PDT）导出至少一些瞬时信号的序列分量，其中一个序列分量为 总负序电流分量。 另外，该方法包括基于至少一些序列分量来计算预期的负序电流。 此后，该方法从总负序电流中减去预期的负序电流，以确定故障负序电流，其中故障负序电流表示故障。 更优选地，该方法还包括基于至少一些序列分量来计算固有电动机负序电流，并且从如上所述产生的故障负序电流中减去固有电动机负序电流，以确定修正的故障负序电流 。 值得注意的是，该方法和装置能够检测导致修正的故障负序电流低至满负载电流的约0.2％的故障。
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公开(公告)号：US4833386A
公开(公告)日：1989-05-23
申请号：US103729
申请日：1987-10-02
申请人： Peter J. Unsworth
发明人： Peter J. Unsworth
CPC分类号： H02P3/18
摘要： An electric motor is coupled to the power lines by thyristors. The motor is braked by triggering the thyristors at the proper times to produce a electro-magnetic field within the motor which opposes the residual magnetic field of the rotor. The proper time to trigger the thyristors is determined by comparing the polarity of the voltage across the power lines to the back emf voltage from the motor. The thyristors are triggered when these two voltages have opposite polarities. The braking circuit also regulates the duty cycle of the thyristors to control the magnitude of the current applied to brake the motor.
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公开(公告)号：US07099852B2
公开(公告)日：2006-08-29
申请号：US10824899
申请日：2004-04-15
IPC分类号： G06N5/00
CPC分类号： G06N3/088 , F04D15/0077 , F04D15/0088 , F04D29/669 , G01R31/2846 , G01R31/343 , G06N5/048 , Y10S706/904 , Y10S706/905 , Y10S706/906 , Y10S706/907
摘要： A system and method is provided for monitoring the operating condition of a pump by evaluating fault data encoded in the instantaneous current of the motor driving the pump. The data is converted to a frequency spectrum which is analyzed to create a fault signature having fault attributes relating to various fault conditions associated with the pump. The fault signature is then input to a neural network that operates in conjunction with a preprocessing and post processing module to perform decisions and output those decisions to a user interface. A stand alone module is also provided that includes an adaptive preprocessing module, a one-shot unsupervised neural network and a fuzzy based expert system to provide a decision making module that operates with limited human supervision.
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8.发明授权System and method for motor fault detection by space vector angular fluctuation 有权通过空间矢量角波动进行电机故障检测的系统和方法公开(公告)号：US06640196B1
公开(公告)日：2003-10-28
申请号：US09931522
申请日：2001-08-16
IPC分类号： G06F1900
CPC分类号： G01R31/343
摘要： Systems and methodologies are disclosed for detecting faults and adverse conditions associated with electric motors. The method comprises obtaining a current signal associated with the motor, calculating a space vector from the current signal, determining a space vector angular fluctuation from the space vector, and analyzing the space vector angular fluctuation in order to detect at least one fault associated with the motor. Systems are disclosed having a diagnostics component adapted to obtain a space vector angular fluctuation from a current signal relating to operation of the motor, and to analyze the space vector angular fluctuation in order to detect at least one fault in the motor.
摘要翻译： 公开了用于检测与电动机相关的故障和不利条件的系统和方法。 该方法包括获得与电动机相关联的电流信号，从当前信号计算空间矢量，从空间矢量确定空间矢量角波动，以及分析空间矢量角波动，以便检测至少一个与 发动机。 公开了具有诊断部件的系统，该诊断部件适于从与电机的操作相关的电流信号获得空间矢量角波动，并且分析空间矢量角波动以便检测电动机中的至少一个故障。
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9.发明授权Method of controlling the starting, stopping and speed of an AC induction motor 有权控制交流感应电动机起动，停止和转速的方法
公开(公告)号：US6163129A
公开(公告)日：2000-12-19
申请号：US266549
申请日：1999-03-11
摘要： A method for controlling the starting, stopping and operation of an AC motor is provided. Each winding of the AC motor is interconnected to an AC source by a thyristor switch and a bypass contactor for providing voltage and current to the AC motor. The method includes a steps of sequently firing a pair of tyristor switches to bring the AC motor to full operating speed. Once at operating speed, the bypass contactors are closed. Upon detection of a voltage drop across a thyristor switch, the thyristor switch is fired immediately to transfer motor current from the bypass contactor to the thyristor switch in order to maintain voltage and current to the AC motor.
摘要翻译： 提供一种用于控制AC电动机的启动，停止和操作的方法。 AC电动机的每个绕组通过晶闸管开关和用于向AC电动机提供电压和电流的旁路接触器与AC电源互连。 该方法包括随后点燃一对可控硅开关以使AC电动机达到完全运行速度的步骤。 一旦处于运行速度，旁路接触器关闭。 当检测到晶闸管开关上的电压降时，晶闸管开关立即被激发，以将电动机电流从旁路接触器传递到晶闸管开关，以保持对电动机的电压和电流。
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公开(公告)号：US5567994A
公开(公告)日：1996-10-22
申请号：US536894
申请日：1995-09-29
CPC分类号： H02J3/1842 , Y02E40/22
摘要： A hybrid active filter shunts three-phase power with passive elements tuned to have low impedance at a frequency of harmonic distortion. The passive elements are in series with controlled voltages sources providing cancelling currents to the harmonic currents. Rapid determination of the harmonic currents is provided in real-time through the use of a Park transformation reducing the variables which need to be manipulated. Measured currents as transformed are used to model undistorted current based on an average power consumed by the load. When the undistorted current is subtracted from the actual current, a harmonic current signal is produced that may be used to drive the voltage sources. The time domain method requires rapidly computed running averages and thus may be performed in-between the acquisition of the measured current samples.
摘要翻译： 混合有源滤波器将三相功率与被调谐为在谐波失真频率处具有低阻抗的无源元件分流。 无源元件与控制电压源串联，提供对谐波电流的消除电流。 谐波电流的快速确定通过使用Park变换来实时提供，减少需要操纵的变量。 转换后的测量电流用于根据负载消耗的平均功耗对未失真电流进行建模。 当从实际电流中减去不失真的电流时，产生可用于驱动电压源的谐波电流信号。 时域方法需要快速计算的运行平均值，因此可以在获取测量的当前样本之间进行。
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