ID4501C Dual Channel Rotary Encoder Kit
4Pages

ID4501C Dual Channel Rotary Encoder Kit Product data Features • Highly miniaturized linear encoder in SMD-format • Differential inductive sensing principle • Insensitive to magnetic interference fields • Robust against oil, water, dust, particles • Programmable resolution and maximum speed • Optional with cable, connector and holder Applications • Brushed and brushless motors • Industrial and laboratory automation • Rotary stages • Robotics, assembly equipment • High-speed motion control Key Specifications Description The ID4501C incremental encoder kit consists of an encoder and a codewheel (Fig. 1). The encoder is an integrated circuit in a PCB housing in SMD-format. It provides incremental A and B output signals in quadrature (Fig. 2). The codewheel is a PCB with passive copper strips. The orientation of the encoder is selected in Table 1. Resolution, maximum speed and airgap The resolution and the maximum speed of the encoder are user-programmable or can be programmed ex-factory. The resolution depends on a filter setting that limits the maximum speed of the encoder vs. the codewheel. The resolution also depends on the maximum distance between the encoder and the codewheel. The resolution and maximum speed for a certain maximum air-gap are selected in Tables 2 and 3. Codewheel The codewheels are shown in Fig. 4 and are selected in Table 5. The codewheel may be mounted on a hub, using a rim for accurate positioning in front of the encoder. Encoder assembly The encoder can be assembled by reflow soldering on a rigid or flexible PCB. Optimum performances are obtained by following the recommended schematic (Fig. 5) and footprint (Fig. 6). In particular, there should be no copper traces or metal objects behind the encoder up to a distance of 3 mm in order to avoid any influence on the measured position. If this is not possible, a blank copper layer behind the encoder (rear-side of the PCB) may be envisaged and/or a linearization using the on-chip look-up table (LUT). Encoder holder The encoder holder type A is available (Fig. 7) and can be selected in Table 6. It includes the encoder and the external components according to the recommended schematic (Fig. 5). The encoder holder can be mounted on any substrate using 4 screw holes. Encoder cable and connector The encoder on holder can be supplied with a flat cable of pitch 1.27 mm and a connector (Fig. 7). The cable length and the connector type are selected in Tables 7 and 8. Encoder programming The Evaluation and Programming Tool (EPT) including an interface board and the ASSIST software is available for the linearization and programming of the encoder. 3D models of encoder, holder and scales STEP models are available on www.posic.com.

Linearity For high-resolution high-precision applications, it is possible to linearize the encoder by means of a Look-Up Table (LUT) that is located inside the encoder. The LUT can be programmed in volatile or in non-volatile memory by means of the Evaluation and Programming Tool (EPT) or it can be pre-programmed by POSIC. The LUT option is selected in Table 4. 0 = Phase P = Pulse width Definitions Airgap Cycle CPP °e Phase shift O Distance between encoder and scale in Z-direction. See Fig. 1. One A quad B period, see Fig. 2. Cycles per scale-period. Electrical degree (one Cycle is 360°e)...

Outer diameter Inner diameter * Readout Radius = position of encoder center ** Thickness tolerance +/- 10% of thickness Fig. 4 Codewheel dimensions in mm.

BB Maximum speed Table 2 D Look-Up Table Table 4 EEEEE Codewheel Table 5 F Encoder holder Table 6 Table 1: Orientation. Arrows indicate direction of move ment of the scale with rising edge A prior to B. Table 2: Maximum speed Lower Max speed leads to a lower jitter of the A/B outputs. * Recommended airgap = 0.2 mm. Sequence of A and B transitions is correct up to Max Airgap, but encoding specifications may be out of range. Table 4: . Look-Up Table (LUT) © Copyright 2017 POSIC. All rights reserved. No part of this document may be reproduced without the prior written consent of POSIC....