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Hollow Shaft
80mm
31mm
25/30mm
500-10000ppr
Incremental encoder
IP65
TTL, HTL, NPN, PNP, Push-Pull, Voltage
No
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K77 Incremental Optical Encoder (Through Shaft)
1. Overview
The K77 is an ultra-thin through-shaft incremental optical encoder designed to excel in industrial environments with limited space. Boasting a protection grade of IP65, it features a unique flexible spring plate for versatile installation and supports multiple electrical interfaces, making it highly adaptable to diverse user requirements for both environment and space constraints.
2. Key Features
Compact & Miniaturized Design: External diameter of 77mm, thickness of 31mm, and maximum shaft diameter of 30mm, achieving ultra-thin and miniaturized dimensions.
Secure Mounting: Adopts a ring-locking mounting structure for stable installation.
Non-Contact Sensing: Utilizes the non-contact photoelectric principle for reliable performance and long service life.
Protection Mechanisms: Equipped with reverse polarity protection and short-circuit protection to enhance operational safety.
Multiple Interfaces: Offers a variety of electrical interfaces (e.g., OC NPN, Push-pull, TTL, HTL) to meet different system compatibility needs.
High Resolution: Supports a maximum resolution of 10000 PPR (Pulses Per Revolution) for precise position and speed detection.
3. Applications
Ideal for use in motor control, CNC machines, and other industrial automation equipment that requires accurate motion feedback.
4. Connection Options
Radial Socket: M12 8-pin male socket for stable, plug-and-play connectivity.
Radial Cable: Standard cable length of 1m (customizable up to 100m, denoted as "C+number", e.g., C100 for 100m).
5 Mechanical Specifications
Shaft Diameter: 25mm / 30mm (stainless steel)
Starting Torque: <80×10⁻³ N·m
Moment of Inertia: <100×10⁻⁶ kg·m²
Shaft Load: Radial 70N; Axial 50N
Maximum Slew Speed: ≤3000rpm
Shell Material: Aluminium alloy
Weight: Approximately 400g
6.Environmental Specifications
Operating Temperature: -20~+85°C (repeatable winding cable: -10°C)
Storage Temperature: -25~+90°C
Operating/Storage Humidity: 35~85% RH (non-condensing)
Vibration Endurance: Amplitude 0.75mm, 5~55Hz, 2h per X/Y/Z direction
Shock Endurance: 1960m/s², 11ms, 3 times per X/Y/Z direction
Protection Grade: IP65
7. Output Waveform
For OC NPN, TTL, and HTL interfaces: Phase A leads Phase B by T/4±T/8 (T=360° cycle). Viewed from the encoder front, the rotation direction corresponding to this phase relationship is counterclockwise (CCW).
Z signal: Available in low-level active or high-level active (see model selection for details).
| Items | Basic parameters |
| Encoder type | Incremental encoder |
| Brand | HENGXIANG |
| External diameter | 77mm |
| Thickness | 31mm |
| Installation dimension | 85mm |
| Hollow shaft type | through hole (clamping ring at prior and clamping ring at rear) |
| Hollow shaft diameter | 25mm,28mm,30mm |
| Resolution | 500;512;1024;1000;2048;2000;2500;4000;4096:5000;8000;8192;10000 |
| Output phase | Phase A+,B+,Z+,A-,B-,Z- |
| Reverse polarity protection | √ |
| Short circuit protection | √ |
| Supply voltage | DC5V ; DC8-30V |
| Outlettype | Radial cable;Radial socket |
| Output mode | NPN/PNP(Open Collector Output) |
| Voltage output | |
| Push-pull output | |
| line drive (DC5V, 26LS31/26C31) TTL | |
| line drive(DC8-30V) HTL | |
| Consumption current | 120mA MAX |
| Top response frenquency | 300KHZ |
| Allowable ripple | ≤3%rms |
| Load Voltage | ≤DC30V |
| GND | not connect to encoder |
| Mark to Space ratio | 45% to 55% |
| starting torque | less than 80 x 10-3 N.m |
| Intertia moment | less than 100x 10-6kg.m2 |
| Shaft load | Radial 70N; Axial 50N |
| Top REV | ≤3000RPM |
| Environmental temperature | Operating:-20 ～+85°；storage:-25 ～+90° |
| Enviromental humidity | Operating and storage: 35-85%RH(noncondensing) |
| Vibration(endure) | Amplitude 0.75mm,5-55Hz,2 hours for three axis individually |
| Sock(endure) | 1960m/s2 ,11 ms three times for X,Y,Z direction individually |
| Shaft Material | Stainless steel |
| Shell Material | Aluminium alloy |
| Cable length | 1000mm(cable with shielding) |
| Protection grade | IP65 |
| Certification | CE |
| package | Carton box |
| Net weight | About 400g (with package) |
Shanghai Hengxiang Optical Electronics Co., Ltd. is a high-tech enterprise specializing in the creation, research, production, and marketing of high-precision optical encoders. We have a mature independent research and development capability, which enables to customize the production of exclusive models based on the needs of new development technology products. We founded in 2001 and exported products to domestic and overseas after 21 years of sedimentation. Our company mainly engaged in the encoder, optical lens, germanium products, etc. The strict control of product quality and high precision and high standard of deep processing technology serve the elevator, motor, CNC, textile, robot, wind power, medical, assembly line equipment, and other automation technology industries.
We focus on being a well-known brand in the field of precision optical encoders and aim to be a leader in international precision encoders.
"Precision in Sensing for a Sci-tech Life.” "Hengxiang will adhere to the corporate principles of "Integrity, Precision & Pragmatism, Customer-oriented, Unity and Mutual-success".
