EC35 Commutation Motor Encoder

EC35 Webproduct 01 Product Photo
35MM ENCODER WEB DWG 6 0 Mechanical Drawing

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EC35 WEB Base Options Mechanical Drawing

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EC35 Features

  • Kit version for mounting on a motor or other rotating shaft
  • U/V/W commutation outputs (differential or open-collector)
  • 0-12 poles or custom
  • 11 Resolutions from 500 to 60,000 CPR (2,000 to 240,000 PPR)
  • For NEMA 17 to 34 and larger motors
  • Supports 5 shaft sizes (5 to 8 mm and 1/4 to 3/8 in.)
  • Index output is standard
  • High retention cable (sold separately)

See more info below

Configure the EC35

US Digital EC35 Motor Encoder Description

Restriction of Hazardous Substances

The US Digital EC35 motor encoder mounts directly to a motor but can also be installed on any rotating shaft. This incremental encoder uses a specially patterned optical disk on a precision-machined aluminum hub. In addition to a quadrature and differential index output, this encoder also provides a commutation output (differential or open-collector) for brushless motors with various pole counts.

This disk, in combination with an IC detector, creates a system that provides high resolution up to 60,000 CPR and is tolerant to mechanical misalignment. A push-on hub design securely grips the shaft without set screws, and a robust, glass-filled polymer housing provides easy installation in space-limited applications. 

A built-in, removable spacer tool ensures that the encoder disk is automatically set to the correct gap when the encoder housing is mounted. The encoder can be "timed" by rotating a ring on the assembly and pressing the ring in with a simple tool to lock everything into place.

This optical encoder is designed for use with a high-retention connector. After making each selection in the Product Configurator, a compatible cable will be displayed below and must be purchased separately.

Please Note: Due to the EC35's design, it is recommended for use as a one-time installation.

Product Specifications

ENVIRONMENTAL

PARAMETER PARAMETER UNITS
Operating Temperature -20 to 105 C
Electrostatic Discharge, IEC 61000-4-2 ±12 kV
Vibration (10Hz to 2kHz, sinusoidal) 20  G
Shock (6 milliseconds, half-sine) 75 G

MECHANICAL

PARAMETER VALUE UNITS
Max. Shaft Axial Play ±0.003 in.
Max. Shaft Runout 0.001 T.I.R. in.
Max. Acceleration 250000 rad/sec²
Maximum RPM, CPR ≤ 2500
e.x. CPR = 2500, max. rpm = 9600		 ((24 x 10^6) / CPR) RPM
Maximum RPM, CPR = 4000 12000 RPM
Maximum RPM, CPR = 5000 9600 RPM
Maximum RPM, CPR = 10000 6000 RPM
Maximum RPM, CPR = 20000 3000 RPM
Maximum RPM, CPR = 40000 1440 RPM
Maximum RPM, CPR = 60000 960 RPM
Codewheel Moment of Inertia 6.48 x 10-5 oz-in-s2
Required Shaft Length 0.500 to 0.565 in.
Mounting Screw Torque 2-3 in-lbs
Technical Bulletin TB1001 - Shaft and Bore Tolerances Download

ELECTRICAL

SPECIFICATIONS MIN. TYP. MAX. UNITS NOTES
Supply Current
  CPR ≤ 2500
  CPR > 2500		  
13
37		  
17
44
mA
no output load, max. frequency output
Supply Voltage 4.5 5.0 5.5 V  
Differential High Level Output 2.5 3.5   V loh = -8 mA
Differential Low Level Output     0.5  V lol = 8 mA
Differential Rise/Fall Time   100   ns  
Open collector pullup voltage     30 V lload = 100 mA
Open collector "on" resistance   0.2   ohm lload = 100 mA
Frequency Response,
CPR ≤ 2,500		     400 kHz  
Frequency Response,
CPR = 4,000 & 5000		     800 kHz  
Frequency Response,
CPR = 10,000		     1 MHz  
Frequency Response,
CPR = 20,000 / 40,000 / 60,000		     960 kHz  

 

INCREMENTAL OUTPUT TIMING

EC35 Incremental Output Timing Diagram

PARAMETER MIN. TYP. MAX. UNITS
Symmetry, S1, S2  108 180  252 elec. deg.
Quadrature Delay, Q  45 90  135 elec. deg.
Index Width, W  45 90  135 elec. deg.

A leads B for CCW shaft rotation, and B leads A for CW rotation viewed from the top side of the encoder.

ACCESSORIES

Screws:

Part #: SCREW-256-188-SH
Description: Socket Head Cap, #2-56 UNC x 3/16"
Use: Base Mounting
Quantity Required: 2
Screws are included

Part #: SCREW-M25-5MM-PH
Description: Pan Head, Phillips M2.5 x 0.45 x 5mm
Use: Base Mounting
Quantity Required: 2

Part #: SCREW-M25-5MM-BH
Description: Button Head Cap, M2.5 x 0.45 x 5mm
Use: Base Mounting
Quantity Required: 2
Screws are included

COMMUTATION OUTPUT TIMING

EC35 Commutation Output Timing Diagram

PARAMETER MIN. TYP. MAX. UNITS
State width, 4 pole  27 30  33 angular deg.
State width, 6 pole  17 20  23 angular deg.
State width, 8 pole  12 15  18 angular deg.
State width, 10 pole  9 12  15 angular deg.
State width, 12 pole  7 10  13 angular deg.

PIN-OUTS

Pin "D" Output Option "C" Output Option "0" pole Option
1 A+ (A Quadrature) A+ (A Quadrature) A+ (A Quadrature)
2 A- A- A-
3 B+ (B Quadrature) B+ (B Quadrature) B+ (B Quadrature)
4 B- B- B-
5 Z+ (Index) Z+ (Index) Z+ (Index)
6 Z- Z- Z-
7 U+ (U Commutation) U (Open collector) no connection
8 U- no connection no connection
9 V+ (V Commutation) V (Open collector) no connection
10 V- no connection no connection
11 W+ (W Commutation) W (Open collector) no connection
12 W- no connection no connection
13 +5V power  +5V power +5V power
14 GND  GND GND
15 no connection  no connection no connection

Additional Information

Product Notes

  • Cables and connectors are not included and must be ordered separately.
  • US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Assembly Instructions & Videos

Press Releases

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