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1.发明授权
公开(公告)号：US5736936A
公开(公告)日：1998-04-07
申请号：US585390
申请日：1996-01-11
申请人： Bart J. Bombay , Marvin W. Rasmussen , Lloyd D. Clark, Jr. , Terry L. Mayhugh , Terry L. Mayhugh, Jr. , Jimmy E. Neeley , Guy Vachon
发明人： Bart J. Bombay , Marvin W. Rasmussen , Lloyd D. Clark, Jr. , Terry L. Mayhugh , Terry L. Mayhugh, Jr. , Jimmy E. Neeley , Guy Vachon
CPC分类号： H02J13/00 , G01R19/04 , G01R31/021
摘要： A method and apparatus for predicting the peak voltage at the load end of a power transmission cable having a power supply end and a load end, where direct measurement at the load end is not practical. The method samples the current and voltage waveforms at the power supply end of the cable. The current waveform is used to estimate a current function which includes a full width at half maximum and adjustments for cable reactive current, distortions, and load. The product of the current function and a peak voltage sample from the power supply end is an estimate of the peak voltage at the load end. The method and apparatus have been applied to oil well logging where one or more logging tools are lowered at the end of a transmission cable into an oil well and it is desirable to predict peak voltage at the tools to ensure proper tool performance. An important improvement is a more accurate current function which compensates for capacitive current flow in the cable and includes a quadratic term. Additional improvements are described, namely a method for predicting downhole current, adjustments for power supply distortions, and diagnostic metrics.
摘要翻译： 一种用于预测具有电源端和负载端的电力传输电缆的负载端的峰值电压的方法和装置，其中在负载端的直接测量是不实际的。 该方法对电缆电源端的电流和电压波形进行采样。 电流波形用于估计包括半峰全宽和电缆无功电流，失真和负载调整的当前功能。 来自电源端的当前功能和峰值电压采样的乘积是负载端的峰值电压的估计。 该方法和设备已经应用于油井测井，其中一个或多个测井工具在传输电缆的末端降低到油井中，并且期望预测工具的峰值电压以确保适当的工具性能。 一个重要的改进是更准确的电流功能，补偿电缆中的电容电流，并包括二次项。 描述了额外的改进，即预测井下电流，电源失真调整和诊断指标的方法。
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2.发明授权
公开(公告)号：US5483232A
公开(公告)日：1996-01-09
申请号：US285314
申请日：1994-08-03
CPC分类号： H02J13/00 , G01R19/04 , G01R31/021
摘要： A method and apparatus for predicting the peak voltage at the load end of a power transmission cable having a power supply end and a load end, where direct measurement at the load end is not practical. The method samples the current and voltage waveforms at the power supply end of the cable. The current waveform is used to estimate a current function which includes a full width at half maximum approximation adjusted as required for load, cable type, and cable length. The product of the current function and a peak voltage sample from the power supply end is an estimate of the peak voltage at the load end. The method and apparatus have been applied to oil well logging where one or more logging tools are lowered at the end of a transmission cable into an oil well and it is desirable to predict peak voltage at the tools to ensure proper tool performance.
摘要翻译： 一种用于预测具有电源端和负载端的电力传输电缆的负载端的峰值电压的方法和装置，其中在负载端的直接测量是不实际的。 该方法对电缆电源端的电流和电压波形进行采样。 电流波形用于估计当前功能，其包括根据负载，电缆类型和电缆长度所需的半最大近似值的全宽度。 来自电源端的当前功能和峰值电压采样的乘积是负载端的峰值电压的估计。 该方法和设备已经应用于油井测井，其中一个或多个测井工具在传输电缆的末端降低到油井中，并且期望预测工具的峰值电压以确保适当的工具性能。
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3.发明授权Sensorless field-oriented control (FOC) without current sampling for motors 有权无电机采样的无传感器磁场定向控制（FOC）公开(公告)号：US08928265B2
公开(公告)日：2015-01-06
申请号：US13572840
申请日：2012-08-13
IPC分类号： H02P6/18
摘要： An apparatus includes a sensorless field-oriented control (FOC) motor controller. The motor controller includes a pulse width modulation (PWM) controller configured to generate PWM signals and to provide the PWM signals to an inverter. The motor controller also includes an angle sampler configured to receive a commanded voltage angle signal and to provide the commanded voltage angle signal as an output signal in response to a triggering event. The triggering event is based on a voltage or a current associated with an input or an output of the inverter. The motor controller further includes a first combiner configured to combine (i) a feed-forward voltage angle signal and (ii) a second signal based on the output signal. The first combiner is configured to generate the commanded voltage angle signal. In addition, the motor controller includes a second combiner configured to combine a feed-forward voltage amplitude signal and the second signal.
摘要翻译： 一种装置包括无传感器场定向控制（FOC）电动机控制器。 电机控制器包括配置成产生PWM信号并向逆变器提供PWM信号的脉宽调制（PWM）控制器。 电动机控制器还包括角度取样器，其被配置为接收指令的电压角度信号，并且响应于触发事件将指令的电压角信号提供为输出信号。 触发事件基于与逆变器的输入或输出相关联的电压或电流。 电机控制器还包括第一组合器，其被配置为基于输出信号组合（i）前馈电压角信号和（ii）第二信号。 第一组合器被配置为产生指令的电压角信号。 此外，电动机控制器包括被配置为组合前馈电压振幅信号和第二信号的第二组合器。
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