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1. 发明授权

US06580590B2 Motor driver fault protector 失效
公开(公告)号：US06580590B2
公开(公告)日：2003-06-17
申请号：US09755555
申请日：2001-01-04
申请人： Thomas W Holmquist , Ron L. King , Joseph A Eccher
发明人： Thomas W Holmquist , Ron L. King , Joseph A Eccher
IPC分类号： H02H504
CPC分类号： H02H7/0833
摘要： A motor driver high current protector includes a voltage source, a current sensor, a comparator, a switch, a delay circuit, and an inhibitor. The current sensor is configured to sense current passing through the motor driver and output a voltage responsive to the sensed current. The comparator has an output and is configured to generate a low voltage at its output while the output of the current sensor exceeds a first reference voltage. The switch has an input, an output, and a base. The base is activated by a low voltage at the output of the comparator to close the switch. Closing the switch provides electrical connection between the input and the output of the switch. The input of the switch is connected to the voltage source. The delay circuit is connected to the output of the switch and is configured to delay the voltage at the output of the switch while the switch is open. The delay circuit may include a resistor and a capacitor each connected to the output of the switch. The inhibitor is configured to inhibit the motor driver while the output of the switch exceeds a second reference voltage. The inhibitor may include first and second inhibitor comparators, each of the inhibitor comparators has an output. Each of the first and second inhibitor comparators is configured to generate a low voltage at its output while the output of the switch exceeds a second reference voltage.

2. 发明授权

US06232594B1 Feedback control system using optical incremental position encoder with dual sinusoidal intensity patterns 有权
标题翻译：具有双正弦强度图案的光学增量式位置编码器的反馈控制系统
公开(公告)号：US06232594B1
公开(公告)日：2001-05-15
申请号：US09338232
申请日：1999-06-22
申请人： Joseph A Eccher , Michael J Steinle
发明人： Joseph A Eccher , Michael J Steinle
IPC分类号： G01D534
CPC分类号： G01D5/347 , G01D5/34
摘要： A feedback control system has two sinusoidal quadrature position feedback signals generated by photosensitive detectors that sense light reflected from (or transmitted through) position encoding strips that have a reflectance (or transmissivity) that varies sinusoidally along the length of the strip. The system may have one position encoding strip, with two photosensors offset along the length of the strip to provide a ninety degree phase offset. Alternatively, the system may have two strips that are offset in phase by ninety degrees. An error signal is produced directly within the servo loop without requiring computation of ARC-SIN or ARC-COSINE. The error signal is continuous, and position error is not sensitive to photosensor gain.
摘要翻译：反馈控制系统具有由光敏检测器产生的两个正弦正交位置反馈信号，该信号感测从（或透射）位置编码条带反射的光，其具有沿条带长度正弦变化的反射率（或透射率）。该系统可以具有一个位置编码条带，两个光电传感器沿着带的长度偏移以提供九十度的相位偏移。或者，系统可以具有相位偏移九十度的两个条带。在伺服环路内直接产生误差信号，无需计算ARC-SIN或ARC-COSINE。误差信号是连续的，位置误差对光电传感器的增益不敏感。

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