公开(公告)号：US07838781B2

公开(公告)日：2010-11-23

申请号：US12038394

申请日：2008-02-27

申请人： Paul Streder ,  Erik Brewster ,  Lalo Ruiz ,  Ariesta Wibisono

发明人： Paul Streder ,  Erik Brewster ,  Lalo Ruiz ,  Ariesta Wibisono

IPC分类号： G01G23/01 ,  G01G9/00 ,  G01G19/40

CPC分类号： G01G19/005 ,  G01G19/4148

摘要： A method (51) for measuring the mass of an object such as a letter (10) in motion. An apparatus (12) for carrying out the present invention includes a pair of rollers (16, 18) through which a letter passes. One of the rollers (16) is driven by a motor (20) which has an associated encoder (22) to give motor positional information to a controller (24). In a method of the present invention the controller generates a ramping torque signal (44) which is provided to the motor. A friction correction curve (40) is generated and applied to the torque signal, and an average torque value (C) is determined. From the positional information provided by the encoder, acceleration (50) is derived and an inertia value is obtained by dividing the average torque (C) by the acceleration. Prior to obtaining an inertia value with a letter, an initial inertia value is obtained without a letter to get a base inertia. The base inertia is subtracted from the measured inertia with a letter to get a difference ΔI. The mass (M) of the letter is obtained using the formula ΔI=½Mr2, where r is the radius of the driven roller.

摘要翻译： 一种用于测量运动中诸如字母（10）的物体的质量的方法（51）。 用于实施本发明的装置（12）包括一对字母通过的辊（16,18）。 其中一个辊（16）由具有相关编码器（22）的马达（20）驱动，以向控制器（24）提供马达位置信息。 在本发明的方法中，控制器产生提供给电动机的斜坡转矩信号（44）。 产生摩擦校正曲线（40）并将其应用于转矩信号，并确定平均转矩值（C）。 根据编码器提供的位置信息，导出加速度（50），并通过将平均转矩（C）除以加速度来获得惯性值。 在用字母获得惯性值之前，可以获得初始惯性值而不用字母来获得基本惯量。 从测量的惯性中减去基本惯性，用一个字母得到差值Dgr; I。 使用公式Dgr获得字母的质量（M）; I =½Mr2，其中r是从动辊的半径。

公开(公告)号：US20090216487A1

公开(公告)日：2009-08-27

申请号：US12038394

申请日：2008-02-27

申请人： Paul Streder ,  Erik Brewster ,  Lalo Ruiz ,  Ariesta Wibisono

发明人： Paul Streder ,  Erik Brewster ,  Lalo Ruiz ,  Ariesta Wibisono

IPC分类号： G01G19/00

CPC分类号： G01G19/005 ,  G01G19/4148

摘要： A method (51) for measuring the mass of an object such as a letter (10) in motion. An apparatus (12) for carrying out the present invention includes a pair of rollers (16, 18) through which a letter passes. One of the rollers (16) is driven by a motor (20) which has an associated encoder (22) to give motor positional information to a controller (24). In a method of the present invention the controller generates a ramping torque signal (44) which is provided to the motor. A friction correction curve (40) is generated and applied to the torque signal, and an average torque value (C) is determined. From the positional information provided by the encoder, acceleration (50) is derived and an inertia value is obtained by dividing the average torque (C) by the acceleration. Prior to obtaining an inertia value with a letter, an initial inertia value is obtained without a letter to get a base inertia. The base inertia is subtracted from the measured inertia with a letter to get a difference Δl. The mass (M) of the letter is obtained using the formula Δl=1/2M r2, where r is the radius of the driven roller.

摘要翻译： 一种用于测量运动中诸如字母（10）的物体的质量的方法（51）。 用于实施本发明的装置（12）包括一对字母通过的辊（16,18）。 其中一个辊（16）由具有相关编码器（22）的马达（20）驱动，以向控制器（24）提供马达位置信息。 在本发明的方法中，控制器产生提供给电动机的斜坡转矩信号（44）。 产生摩擦校正曲线（40）并将其应用于转矩信号，并确定平均转矩值（C）。 根据编码器提供的位置信息，导出加速度（50），并通过将平均转矩（C）除以加速度来获得惯性值。 在用字母获得惯性值之前，可以获得初始惯性值而不用字母来获得基本惯量。 从测量的惯性中减去基本惯性，用一个字母得到差值Deltal。 使用公式Deltal = 1 / 2M r2获得字母的质量（M），其中r是从动辊的半径。