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Home→ Products→ Encoders→ Industrial Encoders→ Special Mount→ UK3508 Series 35mm Tapered Shaft Incremental Encoder

UK3508 Series — 35mm Tapered Shaft 6-Channel Incremental Encoder for PMSM Commutation

Precision 35mm tapered shaft incremental encoder with a self-centering design that eliminates keyway machining on motor shafts. The UK3508 delivers a unique 6-channel output (A/B/Z + U/V/W), providing commutation tracks essential for PMSM (Permanent Magnet Synchronous Motor) control. Supporting 500KHz response frequency, 5V or wide-voltage power supply, IP54 protection, and up to 6000 r/min. EPOCH is a trusted industrial encoder supplier providing sourcing solutions for servo motor and motion control applications.

Lead Time: 7-Day Dispatch | Sourcing Solutions for Industrial Encoder Applications | Price: Contact for Quote

6-Channel Output (A/B/Z + U/V/W) — Essential for PMSM Motor Commutation

Tapered Shaft Design Self-centering, no keyway machining required

6-Channel Output A/B/Z + U/V/W for PMSM commutation

φ6 / φ6.35 Shaft Options Compatible with standard motor shaft sizes

500KHz Response Frequency High-speed signal processing

IP54 Protection Waterproof, oil-proof, dustproof

5V / Wide-Voltage Supply DC 5V±0.25V base; 24V / H / L wide-voltage options available

Up to 6000 r/min High-speed capability

MTBF ≥50000h Long service life, high reliability

Understanding 6-Channel Output (A/B/Z + U/V/W)

A / B / Z — Position & Speed Feedback

Standard incremental encoder signals. A and B are quadrature signals (90° phase shift). Z is the index pulse for absolute position reference.

U / V / W — PMSM Commutation Tracks

Commutation signals indicating the electrical position of PMSM motors, enabling the controller to commutate motor phases smoothly.

UK3508 35mm Tapered Shaft Encoder — Technical Specifications & Parameters

Supply Voltage (VCC)	DC 5V±0.25V (ordering options: 5V / 24V / H / L)
Signal Output	6-channel: A, B, Z + U, V, W
Response Frequency	0~500 KHz
Max Mechanical Speed	6000 r/min
Output Voltage — High Level	≥ 2.5V (at VCC=5V, RL>1kΩ)
Output Voltage — Low Level	≤ 0.4V
Current Consumption	≤ 100 mA (no load)
Output Waveform	Square Wave
Duty Cycle	0.5T ± 0.1T
Starting Torque	3×10⁻³ N·m (+25°C)
Moment of Inertia	1×10⁻⁵ kg·m²
Max Shaft Load — Radial	10N
Max Shaft Load — Axial	10N
Protection Rating	IP54
Operating Temperature	-20°C ~ +85°C
Storage Temperature	-20°C ~ +85°C
Operating Humidity	30~85% RH (no condensation)
Vibration Resistance	49 m/s², 10~200Hz, 2 hours per XYZ direction
Shock Resistance	980 m/s², 6ms, 3 times per XYZ direction
MTBF (Operating Life)	≥ 50000h (+25°C, 2000 rpm)
Weight	Approx. 0.2kg (excluding cable)

UK3508 Mechanical Dimensions

EPOCH UK3508 35mm Tapered Shaft Encoder

Mechanical Dimension Drawing — UK3508 Series Solid Shaft A0

UK3508 Mechanical Dimensions

Note: The tapered shaft design provides self-centering attachment without requiring keyway machining. Shaft bores φ6 and φ6.35 are optional. All dimensions are in millimeters unless otherwise specified.

UK3508 Output Methods & Wiring

Code	Output Type	Description
C	NPN Open-collector Output	Open collector, pull-up resistor required
CP	PNP Open-collector Output	PNP open collector output
T	Voltage Output	Standard voltage totem-pole output
F	Complementary Output	Push-pull complementary output
L	26LS31 Line Driver Output	Line driver differential output
K	7272 Wide Voltage Output	Extended voltage range differential output

Note: Wide-voltage power options are available per the ordering code — 24 (5–24V), H (5–24V Input, 5V Output), L (5V Input, 5–24V Output). All output options include the full 6-channel signal set (A/B/Z + U/V/W).

UK3508 Wire Color Definition

Signal	Wire Color	Function
+V	Red	Power supply (5V)
0V (GND)	Black	Ground
A	Green	Incremental channel A
B	White	Incremental channel B
Z	Yellow	Index pulse
U	Brown	Commutation track U (PMSM)
V	Gray	Commutation track V (PMSM)
W	Orange	Commutation track W (PMSM)
A/	Green / Black	Complementary channel A/
B/	White / Black	Complementary channel B/
Z/	Yellow / Black	Complementary index pulse Z/
U/	Brown / Black	Complementary commutation track U/
V/	Gray / Black	Complementary commutation track V/
W/	Orange / Black	Complementary commutation track W/
Shield	Shield	Cable shield, connected to frame ground

UK3508 Ordering Information

Model format: UK3508 - [Pulses] - Z - [Output Method] - [Power Supply Voltage] - [Cable Outlet] - [Length]

Shaft Bore (Model Suffix)	Description	Mounting
UK3508-φ6	φ6mm Tapered Shaft	Self-centering, no keyway
UK3508-φ6.35	φ6.35mm Tapered Shaft	Self-centering, no keyway

Number of Pulses (P/R)

50, 100, 120, 125, 150, 180, 200, 250, 256, 300, 360, 400, 500, 512, 600, 720, 800, 900, 1000, 1024, 1200, 1800, 2000, 2048, 2400, 2500, 3000, 3600 (or as per customer requirements)

Output Method	Code	Description
NPN Open-collector	C	Open collector, pull-up resistor required
PNP Open-collector	CP	PNP open collector output
Voltage Output	T	Standard voltage totem-pole output
Complementary Output	F	Push-pull complementary output
26LS31 Line Driver	L	Line driver differential output
7272 Wide Voltage	K	Extended voltage range differential output

Power Supply Voltage	Code	Description
5V	5	DC 5V±0.25V
5–24V	24	Wide voltage 5–24V
5–24V Input, 5V Output	H	H-type wide voltage
5V Input, 5–24V Output	L	L-type wide voltage

Cable Outlet	Code	Description
Metal Side Outlet	D	Metal side cable outlet
Rubber Side Outlet	G	Rubber side cable outlet
Socket Side Outlet	H	Socket side outlet
Rubber Rear Outlet	F	Rubber rear cable outlet

Cable Length	Code	Description
0.17 m	0.17	0.17 meters
1 m	1	1 meter
2 m	2	2 meters

Example: UK3508 - 1024 - Z - L - 5 - G - 1 → 1024 P/R, Z phase, 26LS31 line driver, 5V supply, rubber side outlet, 1 m cable.

UK3508 Frequently Asked Questions

What is the difference between A/B/Z and U/V/W channels?

A/B/Z channels provide standard incremental position and speed feedback — the same as a regular encoder. U/V/W channels are commutation tracks that indicate the electrical position of a PMSM motor, allowing the controller to know when to commutate (switch) motor phases for smooth rotation. Without U/V/W signals, a PMSM motor cannot operate properly.

Can the UK3508 be used with BLDC motors?

Yes. The UK3508 is specifically designed for PMSM and BLDC motor applications where commutation signals (U/V/W) are required. The 6-channel output (A/B/Z + U/V/W) is compatible with most PMSM and BLDC motor controllers that support encoder-based commutation.

What power supply voltages does UK3508 support?

The UK3508 base supply is DC 5V±0.25V for standard PMSM servo drives. Per the ordering code, wide-voltage variants are also available: 24 (5–24V), H (5–24V Input, 5V Output), and L (5V Input, 5–24V Output). Choose the code that matches your drive's supply.

Why is the output high-level voltage only ≥2.5V (not ≥3.4V)?

The UK3508's output high-level voltage of ≥2.5V (vs ≥3.4V in other series) is by design for 5V systems. This still meets TTL logic threshold (typically ≥2.0V) and is compatible with most motion controllers and PLCs. Always verify your controller's input threshold before use.

How does the tapered shaft eliminate the need for keyways?

The tapered shaft creates a frictional interference fit with the motor shaft — as the encoder is pressed onto the shaft, the taper wedges it in place. This self-centering design provides slip-free torque transmission without machining a keyway, simplifying installation and reducing cost.

Need a quote or technical consultation for UK3508?

Contact Supplier — liya@epoch-electronic.com

7-Day Dispatch | Sourcing Solutions for Industrial Encoder Applications