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Absolute Inductive Encoder
  • Absolute Inductive EncoderAbsolute Inductive Encoder

Absolute Inductive Encoder

As a professional China absolute inductive encoder supplier, SEA MOTION delivers high-precision non-contact position sensing devices engineered with advanced electromagnetic induction technology. Different from traditional optical encoders, the absolute inductive encoder adopts stator and rotor structural design without optical discs, bearings or light sources, achieving reliable absolute position output without zeroing after power-on. It records unique position codes for every measuring point and retains position data after power failure, ensuring continuous and stable motion monitoring for industrial systems.

Originating from automotive-grade technology, the system inherits years of mature R&D and mass production experience in new energy vehicle drive-by-wire chassis and electric drive position sensors, developed according to automotive-grade reliability standards. It features high-precision position feedback, with detection accuracy down to the arc second level, providing precise angle sensing for robot joints and ensuring motion control stability. It also boasts strong anti-interference capabilities.

Utilizing inductive principle and dedicated signal processing algorithms, and having undergone nearly a hundred rounds of EMC and durability testing, it adapts to high-speed motor operation and strong magnetic interference environments.

Excellent batch consistency: Relying on automotive-grade automated production lines and end-to-end quality control, batch-to-batch consistency meets the demands of large-scale robot production.

Compact structure and strong adaptability: The ring PCB coil and etched conductive turntable structure is small in size, easy to install, and perfectly matches various hollow shaft joint modules.

Company video

Parameter

Model No.

QD38-23BJD

Motor-end resolution

23bit

Encoder type

Absolute multi-turn (battery)

Encoder revolutions

65536 (16bit)

Signal output

485 / BISS-C / SSI / SPI / UART

Install air gap

0.5mm

Working air gap

0.4mm~0.6mm

Max current

<100mA

Working temperature

-40℃~105℃

Storage temperature

-50℃~125℃

Rated speed

≤6000rpm

Installation deviation

Axial<0.2mm, radial<0.1mm

Axial float

≤±0.1mm

Baud rate

2.5Mbps

Communication Protocol

Tamagawa Agreement

Absolute accuracy

±45"

Repeatability

±10"

Communication response frequency

≤16kHz

Relative humidity

≤90%RH,No condensation

Vibration

Maintain an amplitude of 1.5 mm between 10 and 55 Hz; maintain an acceleration of 98 m/s² between 55 and 2000 Hz; test for 2 hours per axis (X, Y, and Z), totaling 6 hours.

Shock

Shock acceleration 980 m/s², 11 ms; 3 shocks per direction, 18 shocks in total.

IP protection

Motor rear housing protection

Electrical parameter

Specification

Temperature T=25℃

Min

Rated

Max

Power supply voltage

4.75V

5V

5.25V

Main power supply power consumption

---

100mA

--

Differential

output level

High level

3.5V

--

--

Low level

--

--

1.7V

Edge change time

--

--

100ns

Insulation resistance

50MΩ

--

--

This encoder features outstanding environmental adaptability and structural durability. Its non-contact working principle eliminates mechanical wear, realizing long-term maintenance-free operation. It is immune to stray magnetic fields, dust, moisture and vibration, perfectly adapting to harsh industrial environments. With high resolution up to 23 bits and low signal latency, it supports mainstream communication protocols including SSI and BiSS-C, delivering accurate and fast position feedback. The compact and lightweight structure also enables flexible installation in limited equipment spaces.

Products Video

Terminal Definitions

Terminal location(1~10)

1

2

3

4

5

6

7

8

9

10

definitions

PE

NC

DATA+

DATA-

RS485-/SLK-

RS485+/SLK+

VBAT

GND

+5V

GND

Wire color

Black Heat-shrink tubing

-

Yellow

Green

White

Blue

Gray

Purple

Red

Black 

Products size

Rotor dimensions


stator dimensions

Q D 38 - 23 B JD

①②③  ④ ⑤⑥

①-Q: DM Q series inductive encoder

②-D: Single encoder

③-38: Outer diameter 38mm

④-23: Encoder resolution: 23-bit

⑤-B: Signal Type: BiSS-C

⑥-JD: Radial (horizontal terminal exit)

Widely used in industrial automation and precision motion control scenarios, the absolute inductive encoder serves robotic arms, automated assembly lines, CNC machine tools and servo motor systems. It also applies to packaging machinery, textile equipment and intelligent logistics devices, providing stable position and angle measurement data to ensure the accuracy, efficiency and safety of automated production operations.

Installation Video:

Installation Diagram                 Tools required for installation

Phillips torque screwdriver

1.5mm hex key torque wrench (metric)

4 x M2x5.5 Phillips pan-head screws with flat washers

2 x M3x3 hex socket cup-point set screws

8 x M1.6x6 Phillips countersunk screws

Installation sequence

Rotor Installation:

① Fit the encoder rotor onto the motor shaft and position it correctly;

②Use DP460 adhesive to securely bond the encoder rotor plate to the shaft sleeve.


[Note]:

1) If the rotor height requires adjustment, perform the tightening step only after the adjustment is complete;

2)To prevent the screws from loosening, apply thread-locking adhesive to the threaded holes beforehand or use pre-coated screws.

The recommended tightening torque is 7 ± 0.2 kgf·cm.


Stator Installation:

① Place the encoder stator onto the mounting surface and align the four screw holes;

② Using a Phillips torque screwdriver, drive in the four screw assemblies one by one

(M2x5.5 Phillips pan-head screw + flat washer assembly).


[Note]: To prevent the screws from loosening, apply thread-locking adhesive to the threaded holes beforehand or use pre-coated screws. Recommended tightening torque: 2.8 ± 0.2 kgf·cm.


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