电磁感应式绝对位置测量用编码器

Electromagnetic induction type absolute position measuring encoder

Abstract

In an electromagnetic induction type absolute position measuring encoder having two or more tracks which includes: two or more rows of scale coils (14-1, 14-2), each row including scale coils numerously arranged on a scale (10) along a measuring direction so as to have a scale pitch different from that of another row; and transmitter coils 24-1, 24-2 and receiver coils 20-1, 20-2 provided on a movable grid (12) relative to the scale (10) in the measuring direction so as to face the scale coils (14-1, 14-2), and which can measure an absolute position of the grid (12) with respect to the scale 10 on the basis of a flux change detected at the receiver coil (20-1, 20-2) via the scale coil (14-1, 14-2) when the transmitter coil (24-1, 24-2) is excited, coil lines (14-1b, 14-1c, 14-2b, 14-2c) are added to at least one side of the scale coils (14-1a, 14-2a) in the measuring direction at least in one of the tracks. Thus, an induced current at the scale coil (14-1, 14-2) when the transmitter coil (24-1, 24-2) is excited is increased, thereby improving a detection signal intensity at the receiver coil (20-1, 20-2).
提供一种电磁感应式绝对位置测量用编码器,具备:在标尺(10)上沿测量方向以互不相同的标尺间距排列多个标尺线圈而成的两列以上的标尺线圈(14-1、14-2);以及在相对于标尺沿测量方向相对移动自如的格(12)上被配置成与标尺线圈相对置向的发送线圈(24-1、24-2)和接收线圈(20-1、20-2),其中,当发送线圈励磁时能够根据经由标尺线圈由接收线圈通过标尺线圈检测出的磁通量的变化测量格相对于标尺的绝对位置,在至少一个磁道的标尺线圈的测量方向的至少一侧附加线圈布线(14-1b、14-1c、14-2b、14-2c)。由此,增加发送线圈励磁时的标尺线圈中的感应电流,提高接收线圈中的检测信号强度。

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