Motor Encoder

Motor encoders are rotary encoders designed for direct installation onto a motor shaft, providing feedback on position, speed, and direction for motion control applications. They are commonly used with servo motors, stepper motors, and BLDC motors in industrial automation and electromechanical systems.

US Digital motor encoders are available in incremental and absolute designs and support a range of output options, including single-ended, differential, analog, PWM, and commutation signals. Offered in multiple sizes and mounting configurations, these encoder kits are engineered for straightforward integration with common motor frame standards.

For a detailed explanation of how motor encoders work and the differences between encoder types, read our Motor Encoder guide.

Incremental Encoder

US Digital’s quadrature encoder kits serve a wide variety of applications. They support shaft sizes from as small as 1.5 mm to as large as 1 inch and are compatible with motor frame sizes from NEMA 6 to NEMA 34. Some are available with differential or open collector output and many have an index option.

Miniature Motor Encoders
Model Cycles per Revolution (CPR) Compatible Shaft Sizes Compatible Motor Sizes Output Options Index	E16 Motor Encoder 10 Resolutions from 250-4,096 1.5mm & 2mm NEMA 6 Single-ended Yes	E4T Motor Encoder 19 Resolutions from 100-1,000 11 Sizes from 2mm-0250 in. NEMA 8-17 Single-ended or Differential No	E8T Motor Encoder 9 Resolutions from 180-720 10 Sizes from 3mm-0.375 in. NEMA 11-23 Single-ended or Differential No
Industry Standard Motor Encoders
Model Cycles per Revolution (CPR) Compatible Shaft Sizes Compatible Motor Sizes Output Options Index	E5 Motor Encoder 25 Resolutions from 32-5,000 14 Sizes from 2mm-10mm NEMA 17-34 Single-ended, Differential or High-Voltage Yes	E6 Motor Encoder 21 Resolutions from 64-10,000 22 Sizes from 2mm-1 in. NEMA 23-34 Single-ended, Differential or High-Voltage Yes
Specialty Motor Encoders
Model Cycles per Revolution (CPR) Compatible Shaft Sizes Compatible Motor Sizes Output Options Index	HB5M Motor Encoder 25 Resolutions from 32-5,000 5 Sizes from 5mm-8mm NEMA 17-34 Single-ended, Differential or High-Voltage Yes	HB6M Motor Encoder 21 resolutions from 64-10,000 11 Sizes from 6mm-0.750 in. NEMA 23-34 Single-ended, Differential or High-Voltage Yes	EC35 Motor Encoder 11 Resolutions from 500-60,000 5 Sizes from 5mm-0.375 in. NEMA 17-34 Open-Collector, Differential or Commutation No
Legacy Motor Encoders
Model Cycles per Revolution (CPR) Compatible Shaft Sizes Compatible Motor Sizes Output Options Index	E2 Motor Encoder 25 Resolutions from 32-5,000 14 Sizes from 2mm-10mm NEMA 17-34 Single-ended Yes	E3 Motor Encoder 21 Resolutions from 64-10,000 22 Sizes from 2mm-1 in. NEMA 23-34 Single-ended Yes

Absolute Encoder

When you need to know shaft position immediately, even after a power cycle, check out US Digital’s Absolute encoders with 12-bit resolution. Some support shaft sizes from 2.0mm to 10.0mm diameters. Outputs include analog voltage, PWM, and US Digital’s SEI protocol.