DS 25 Absolute Rotary Electric Encoders Mechanical Installation Guide

Transcription

1 DS 2 bsolute Rotary Electric Encoders Mechanical Installation Guide Document No. :DS 2 mechanical installation guide Version: 1.01, Feb 2009 Netzer Precision Motion Sensors Ltd. Misgav Industrial Park, P.O. ox 19 D.N. Misgav, 2017 Israel Tel: Fax: global info@netzerprecision.com

2 The DS 2 Electric Encoder is semi modular, i.e. its rotor and stator are separate, but the rotor is captive inside the stator. oth rotor and stator are supported by the host machine at their one end and loaded or clamped, at their other end. The encoder can be mounted either on a middle (TD) of a machine shaft, or at the end of a shaft. step can be machined to provide an axial support area for the rotor as in Figure 1, or the shaft can be smooth and support the rotor with the aid of a ring as shown in Figure 7b. The axial clamping force on the rotor can be provided by a factory supplied special wave springs or through the loading of other machine elements, such as ball bearings. The (encoder) stator is supported axially at its circumference and is secured to the host machine by means of three factory supplied (encoder) stator clamps. The stator is supported radially by a recess in the host machine. In order to meet the recommended axial tolerance, despite potential manufacturing errors in the host machine, special compensation shims are available to be placed underneath the stator, or rotor. In addition, a special gauge can be obtained to assist the selection of the proper shims. Figure 1 Overview Installation procedure Figure 2 shows the encoder clamps (factory supplied with the encoder) and their engagement slots in the encoder. Figure shows the recess in the host machine which supports the encoder both axially and radially, it also shows the contact areas of the rotor and encoder stator. The recommended axial distance between surfaces and (Figure ) is 1. ± 0.0mm; this is in order to center the rotor between the stator s transmitter and receiver plates. xial misalignment will influence the raw sine/cosine output signals of the Fine channel see N 2; however, the accuracy and resolution will be nearly the same as long as the rotor is within ±0.2mm from the center and does not touch the stator plates. DS 2, mechanical installation guide 2

3 Mechanical installation of the encoder involves the following steps: Step 1: Validate the axial distance between the machine support areas and. Since the actual distance between surfaces and includes the host machine tolerance buildup it is easier to meet the requirement using compensation shims as follows: 1. Measure the axial distance h between surfaces and, If 1.mm <h <1.mm: in this case the host machine tolerance are acceptable no shims are needed. 2. If h > 1.mm: put a rotor compensation shim (MP DS 2 SPR0.1 or MP DS 2 SPR0.0) between the rotor bottom and surface.. If h <1.mm: put a stator compensation shim (M DS 2 SP0.1 or M DS 2 SP0.0) between the stator peripheral rim and surface. Note 1: The rotor compensation layer is ring shaped, the (encoder) stator compensation layer is available in thicknesses of 0.1mm and 0.0mm. Note 2: The above measurement can be eased using the special gauge (catalog # MP DS2 GU 01). The gauge is mounted on the machine shaft and is rotated underneath the indicator plunger between two positions while the indicator mounting is stationary. Note : The electrical integrity of the installed DS 2 with analog SIN/OS outputs can be validated as detailed in application note N 02. Note : Standard DS encoders are insensitive to ESD and parasitic capacitive coupling from adjacent voltages, however, it is recommended to allow a discharge path of no more than several tens of kω between the machine shaft and the electronics ground, not leaving it electrically floating. Step 2: The encoder clamps are secured by M2 screws on a φ28mm bolt circle. 1. Screw the encoder clamps. Do not forget to include compensation shims, if needed. 2. Unscrew each encoder clamp slightly and make its flat side face the rotation axis to allow the insertion of the encoder (stator) into the recess.. Turn the encoder in the recess as necessary, to align its slots with the encoder clamps.. Tighten the encoder clamps with a torque of 0.1 Nm to fix the stator as in Figure 1. Figure 2a, deep placing Figure 2b, shallow placing Figure, contact surfaces DS 2, mechanical installation guide

4 Step : lamp the rotor against a step, or a ring on the machine shaft (surface in Figure ) e.g. using any of the means shown in Figure 6. The clamping force should be 0. Nm. Figure, mplitude vs. rotor axial position (a) Deep placing (a1) Shallow placing Figure 6, Rotor clamping options end of shaft (a) Steeped shaft (b) Smooth shaft using ring Figure 7, Rotor support options DS 2, mechanical installation guide

5 Mechanical dimensions DS 2 with loose wires DS 2, mechanical installation guide

6 DS 2, ccessories (Dimensions in are in mm) DS 2, Shallow placing Encoder clamp With bolt UNF 0 80 at No. M DS 2 SLMP 01 Dimensions in mm DS 2, Deep placing Encoder clamp With bolt M2 at No. EMP709 DS 2, mechanical installation guide 6

7 DS 2 Rotor shims 0.1 mm at No. MP DS2 SPR mm at No. MP DS2 SPR0.0 DS 2 Stator shims 0.1 mm at No. MP DS2 SP mm at No. MP DS2 SP0.0 DS 2, mechanical installation guide 7

8 DS 2 Measurement gauge at. No. MP DS2 GU01 DS 2 Retaining ring at. No. MP DS 2, mechanical installation guide 8

9 ± min M 6 X M2 X min. ± ±0.0. ±0.1 ssembly Scale 2 : 1 Host system mounting details D NO. PRT NME TLOG NO. QTY 1 Host shaft Host base - 1 DS-2 Encoder 1 Encoder clamp EMP709 Washer DIN MP olt M (DIN 798) MP Title: DS-2 Installation: Shaft end, stepped shaft, deep installation Date: Jan 09 Version: 0. SHEET 1 OF 1 SLE: 1. : 1 Dimensions : mm

10 ± min M 6 7 X #0-80 X ± min. ± ±0.0 D Host system mounting details NO. PRT NME TLOG NO. QTY 1 Host shaft Host base - 1 DS-2 Encoder 1 DS-2 encoder clamp M-DS2-SLMP-01 Washer DIN MP olt M (DIN 798) MP Title: SHEET 1 OF 1 SLE: 1. : 1 ssembly Scale 2 : 1 DS-2 Installation: Shaft end, stepped shaft Date: Jan 09 Version: 0. Dimensions : mm

11 ± ±0.1 M min X #0-80 X 120 D 1 ± min Host system mounting details NO. PRT NME TLOG NO. QTY 1 Host shaft Host base - 1 DS-2 Retaining ring MP DS-2 Encoder 1 DS-2 encoder clamp M-DS2-SLMP-01 6 Washer DIN MP DIN M x ---.N MP ±0.0.8 ± ±0.0 (using item no. ) Title: DS-2 Installation: Shaft end, smooth shaft Date: Jan 09 SHEET 1 OF 1 Version: 0. SLE: 1. : 1 ssembly Scale 2 : 1 Dimensions : mm

12 1 2 6 Measurement of rotor support surface Measurement of stator support surface D =.0 Gauge Gauge D NO. PRT NME TLOG # QTY 1 Host shaft Host base - 1 DS-2 installation gauge MP-DS2-GU-01 1 Washer DIN MP olt M x (DIN 798) MP Title: DS-2 Installation: Machine measurement gauge Date: Jan 09 SHEET 1 OF 1 Version: 0.2 SLE: 1. : 1 Dimensions : mm