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本文介绍了一种采用串联谐振电桥技术精确灵敏地测量角速度的新型电感速度传感器。此技术基本上是一种无接触测量速度的方法,它只需把一开槽铝盘与转子连接起来。这铝盘在一硅钢片铁芯的气隙中转动,铝盘中感应出的涡流反抗绕在铁芯上的线圈产生的磁场并使线圈电感量明显地产生与转子角速度成正比的周期性变化。串联谐振电桥电路接收了这个变化信号并用其调制一载波电压,产生一个频率等于被测转子角速度的电响应。此传感器加于被测转子上的负载很小,以致可以忽略,这就提供了一种简单廉价和紧凑的装置,可代替步进运动控制、锁相环控制系统或检测技术中采用的典型数字或脉冲测速器。若作进一步改进,亦可适用于遥控速度检测。本文提供了此传感器的设计细节和实验结果。
This paper presents a new type of inductive speed sensor that measures the angular velocity accurately and sensitively using a series resonant bridge technique. This technique is essentially a non-contact measurement of speed, which simply connects a slotted aluminum disk to the rotor. The aluminum plate is rotated in the air gap of a silicon steel core and the induced eddy current in the aluminum plate opposes the magnetic field generated by the coil wound on the iron core and causes the coil inductance to significantly produce a periodic change proportional to the rotor angular velocity . The series resonant bridge circuit receives this change signal and uses it to modulate a carrier voltage to produce an electrical response at a frequency equal to the angular velocity of the rotor under test. The load applied to the rotor under test is so small that it can be ignored, providing a simple, inexpensive and compact device that can replace the typical digital used in step-by-step motion control, phase-locked loop control systems or detection techniques Or pulse tachometer. For further improvement, can also be applied to the remote control speed detection. This article provides design details and experimental results for this sensor.