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Unique designed inner shaft 25-30mm outer diameter 72mm extra thin PN72

PN72 Ultra-Slim Encoder Inner Shaft (25-30mm) for Automation Robotics And Machinery

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PN72 Ultra-Slim Encoder Inner Shaft (25-30mm) for Automation Robotics And Machinery

Download:
PN72-E-01100118 Ver. 3.0.pdf
Shaft Type:
Hollow Shaft
Outer diameter:
70mm
Thickness:
15mm
Shaft diameter:
25/28/30mm
Resolution:
1024-10000ppr
Encoder type:
Incremental encoder
Protection Grade:
IP50
Interface:
TTL, HTL, NPN, PNP, Push-Pull, Voltage
With UVW:
No

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hollow shaft incremental encoder UVW encoder rotary incremental optical encoder encoder 1024ppr rotary encoder incrementalencoder 15mm encoder

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Key Features

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Introduction to PN72 Incremental Optical Encoder (Hollow Shaft)

The PN72 is an incremental optical encoder with a hollow shaft design, distinguished by its unique through-shaft concentric locking device, double-bearing large-aperture ultra-thin structure, and flexible spring plate installation. With a protection grade of IP50, it effectively addresses installation challenges in scenarios with limited space and slight axial movement of motor shafts, making it ideal for servo motors, robots, and other automation control fields.

In terms of physical specifications, the PN72 has an external diameter of 72mm, a minimum thickness of 15mm, and a maximum hollow shaft diameter of 30mm (with optional sizes of 25mm, 28mm, and 30mm marked as Q25, Q28, Q30 respectively). It weighs approximately 200g, ensuring lightweight integration into equipment. Connection options include radial sockets (8P: SM08B-GHS-TB; 14P: SM14B-GHS-TB) and radial cables (standard length 1m, extendable up to 100m with customization denoted as C+number, e.g., C100 for 100m).

Functionally, the encoder adopts a non-contact photoelectric principle, offering multiple electrical interfaces such as OC (NPN open collector circuit), Voltage, Push-pull, TTL (DC5V, including 26C31 and 26LS31 types), and HTL (DC8-30V). It provides reverse polarity protection and short-circuit protection for enhanced durability. The resolution per turn reaches up to 10000PPR, with specialized resolution/pole options for servo motors (e.g., 1000/8, 1024/8, 2048/8, 2500/8, 4096/8, 5000/8, 10000/8). The Z signal can be either low-level or high-level active, depending on configuration.

For output performance, transmission distances vary by interface: up to 50m for OC and Push-pull, 2m for Voltage, and 200m for TTL and HTL (utilizing shielded differential twisted-paired cables). The output waveform features a phase shift of 90°±10° (low frequency) to 90°±20° (high frequency) between signals A and B. When viewed from the encoder front side, phase A leads phase B by 1/4±1/8 of the cycle—with counterclockwise rotation for OC and Voltage interfaces, and clockwise rotation for TTL interfaces. For servo motors, it supports UVW signals alongside ABZ incremental signals, with dedicated wiring configurations to ensure precise position detection.

Electrical parameters include two supply voltage ranges: DC+5V±5% and DC8V-30V±5%. Maximum consumption current is 100mA for OC and 120mA for Voltage interfaces. The top response frequency is 100KHz for OC, 300KHz for TTL, and 500KHz for HTL. Output current limits are ≤30mA (OC/Push-pull), ≤20mA (TTL), and ≤±50mA (HTL). Output voltage levels are ≥2.5V (high level) and ≤0.7V (low level, <20mA), with rise and fall times of <2μs (OC/Voltage, 2m cable) and <1μs (TTL/HTL, 2m cable). Insulation strength is AC500V for 60s, and insulation resistance is 10MΩ, with a mark-to-space ratio of 45%-55%.

Mechanical specifications include a starting torque of less than 60×10⁻³ N·m, an inertia moment of less than 80×10⁻⁶ kg·m², and shaft load capacity of 50N (radial) and 30N (axial). The maximum slew speed is 5000 rpm, and the bearing life reaches 1.5×10⁹ revolutions at rated load (equivalent to 100,000 hours at 2500 RPM). The base is made of die-cast aluminum for robust structural support.

Environmental parameters cover an operating temperature range of -20°C to +85°C (with repeatable winding cables suitable for -10°C and above) and a storage temperature range of -20°C to +90°C. Operating and storage humidity is 35%-85% RH (non-condensing). The encoder endures vibration (amplitude 0.75mm, 5-55Hz, 2 hours per X/Y/Z direction) and shock (980m/s², 11ms, three times per X/Y/Z direction), meeting IP50 protection standards.

Installation of the PN72 (especially for servo motors with UVW) requires specific steps: first, lock the motor’s starting zero position to prevent shaft movement; then mount the encoder on the motor shaft, loosely fasten the M4×6 bolts, tighten the lock nut (15-20N·m) with a spanner, and align the zero signal by rotating the encoder until the LED lights up—finally, secure the bolts and apply thread glue to prevent loosening. Recommended accessories include matching sockets (SM08B-GHS-TB, SM14B-GHS-TB) and shielded cables, with twisted-paired wiring required for signal and power lines to reduce interference.

When using the encoder, note the following: Vibration can cause false pulses (more pronounced for high-resolution models), so avoid harsh vibration environments. Operate within the specified supply voltage (accounting for voltage drop in long cables), separate encoder wiring from other power lines (do not route in the same duct or bundle in parallel), and avoid excessive force on cables to prevent damage.

Items	Basic parameters
Brand	HENGXIANG
Encoder type	Incremental Type
External diameter	72mm
Thickness	15mm
Hollow shaft type	Through shaft
Hollow shaft diameter	25mm; 28mm; 30mm
Resolution	1024/8; 2048/8; 2500/8; 4096/8; 5000/8; 8192;/8; 10000/8
Output phase	3=A+B+Z; 6=A+A-+B+B-+Z+Z-; 6=Less wiring type A+B+Z Delay U+V+W; 12=A+A-+B+B-+Z+Z-+U+U-+V+V-+W+W-
Supply voltage	DC5V; DC8-30V
Outlet type	Radial connector; Radial cable
Output mode	N=OC(DC5V&8-30V); C=TTL(DC5V)
Output mode	E=HTL(DC8-30V); S=TTL(DC5V)(Less wiring type)
Consumption current	120mA Max
Top response frenquency	100kHZ; 500kHZ; 800kHZ
GND	not connected to the encoder, must be effectively connected to GND
Starting torque	Less than 60×10-3 N.m
Inertia moment	Less than 80×10-6 kg.m2
Environmental temperature	Operating: -20~+95℃; Storage: -25~+100℃
Enviromental humidity	Operating and storage: 35~85%RH(noncondensing)
Protection	IP50
Material	Aluminium alloy
Certification	CE
package	Carton box
Net weight	About 200g

选型图

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Compact & Ultra-Thin Design

External diameter: Ø72mm, thickness: min 15mm.
Hollow shaft supports diameters up to Ø30mm.

High Precision & Resolution

Non-contact photoelectric principle.
Resolution up to 10,000 PPR (pulses per revolution).
Phase shift accuracy: 90°±10° (low speed), 90°±20° (high speed).

Robust Protection & Durability

IP50 protection against dust and limited moisture.
Double-bearing design for stability.
Bearing life: 1.5×10⁹ revolutions (100,000 hours at 2,500 RPM).

Flexible Installation

Through-shaft concentric locking device.
Flexible spring plate mounting for slight axial motor shaft movement.
Radial socket (8P/14P) or radial cable (standard 1.0M, customizable up to 100M).

Multiple Electrical Interfaces

Supports OC (NPN), Voltage, Push-Pull, TTL, HTL outputs.
Reverse polarity & short-circuit protection.

Wide Application Compatibility

Ideal for servo motors, robotics, and automation control.
Operates in -20°C to +85°C environments.

High-Speed Performance

Max response frequency: 100–500 kHz (depends on output type).
Slew speed: ≤5,000 RPM.

Easy Zero Alignment (Servo Models)

LED indicator for zero-position alignment.
Includes U/V/W signals for servo motor synchronization.

Lightweight & Durable

Weight: ~200g.
Material: Die-cast aluminum base.

Compliance & Safety

Vibration/shock resistant (tested per industrial standards).
Insulation strength: AC500V for 60s.

Ideal for space-constrained, high-precision motion control systems.

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".

产品详情公司图片

FAQ:

Q: What's your major products?

A: Our company established products from optical lens and encoder disk,which provide a strong theoretical basis for encoders, after 20 years development, we exteneded our business to encoders , this is why our quality is highly assured and won positive feedback compared to other encoder factory.

Q: Are you a manufacturer or a agency?

A: We are a factory for over 23 years of manufacturing experience,welcome to visit our factory,we are located in Shanghai city, China.

Q: Can I customize an encoder if there's no similar parameters from your current catalog?

A: Yes, we can provide customized services,we also have laser printing machines to custom your own logo or part number;

If you would like to get an equivalent products for other brands,you may contact us to get an accurate price and parameters confirmation, we will reply you within one hour in working time.

Q: What is your MOQ?

A: MOQ is 1pcs for our regular encoders.

Q: How long does the lead time take?

A: Delivery takes within 1 week for samples,about 10 days for mass order for regular encoders.