AK90H optical absolute encoder

The AK90H Ø90 mm Absolute Encoder is a high-end optical angle encoder designed for accurate single-turn angular measurement up to ±5 arc. sec. Its design with integral bearings, hollow-through shaft, and integrated stator coupling ensures high reliability in demanding applications such as machine tools, robotics, and precision automation.

Available in two mounting options—ring nut (type H) or shaft clamp (type P)—the AK90H provides flexibility for various machine integration needs. Its robust design delivers long-term stability under vibration and shock while operating in industrial environments.

Key Features

Ø90 mm absolute optical encoder
High accuracy: ±5 arc. sec
Hollow-through shaft (20 mm or 22 mm)
Integrated stator coupling and bearings
Two mounting types: ring nut (H) or shaft clamp (P)
Maximum mechanical speed: 3,000 rpm
Vibration resistance: ≤ 200 m/s²
Shock resistance: ≤ 200 m/s²
Operating temperature: 0…60 °C
IP64 protection for industrial environments

Mechanical Data

Parameter	Mounting Type H	Mounting Type P
Shaft	Hollow-through 20 mm	Hollow-through 20 mm / 22 mm
Moment of inertia	80×10⁻⁶ kg·m²	85×10⁻⁶ kg·m² (20 mm) / 80×10⁻⁶ kg·m² (22 mm)
Starting torque	≤ 0.01 Nm	≤ 0.01 Nm
Maximum mechanical speed	≤ 3,000 rpm	≤ 3,000 rpm
Permissible vibration (55–2000 Hz)	≤ 200 m/s²	≤ 200 m/s²
Permissible shock (6 ms)	≤ 200 m/s²	≤ 200 m/s²
Operating temperature	0…60 °C	0…60 °C
Storage temperature	–20…60 °C	–20…60 °C
Ingress protection	IP64	IP64
Mass (without cable)	~1 kg	~1 kg