1FK7081-5AZ91-1ZZ9-Z (For KUKA) Siemens Servo Motor

This is a SINAMICS/SIMOTICS S1FK7 series compact synchronous servo motor, a custom model dedicated for KUKA robot joint axes, commonly used for joint drives in small and mediumsized KUKA robots.

1. Model Explanation

1FK7: Siemens synchronous servo motor series

081: Frame size 80 mm

5AZ91: Voltage / winding / resolver encoder configuration

1ZZ9: Mechanical design / cable outlet / mounting adaptation

Z: Special specification (custom for KUKA robots)

S11: Internal adaptation code for KUKA

2. Core Electrical Parameters

Type: Permanent magnet synchronous servo motor

Rated power: 1.7 kW

Rated speed: 3000 rpm

Maximum speed: 6000 rpm

Rated torque: 5.4 N·m

Stall torque: 13 N·m

Rated voltage: 400 V threephase

Rated current: approx. 3.7 A

Feedback: Resolver

Cooling method: Selfcooled IC410

3. Mechanical & Protection

Frame: 80 mm

Protection rating: IP65 (housing) / IP67 (shaft end)

Insulation class: Class F

Compatible interface: Dedicated mechanical & electrical interface for KUKA robots

4. Applications

Joint axis drive for KUKA robots

Typical compatibility: Robots with KR C4 / KR C5 controllers

5. Direct Replacement Models

Original identical model: 1FK7081-5AZ91-1ZZ9-Z S11

Functional replacement: Samespec 1FK7081 series KUKAdedicated servos (encoder and interface must be verified)

Complete Model Guide for Siemens 1FK7 Series Compact Synchronous Servo Motors

1. Series Overview & Naming Rules

The Siemens 1FK7 series (SIMOTICS S1FK7) are permanent magnet synchronous servo motors, divided into three types: CT (Compact), HD (High Dynamic), HI (High Inertia).

The following focuses on the full CT Compact models (selfcooled IC410, IMB5 mounting), available in Generation 1 (5A series) and Generation 2 (2A series), with Generation 2 as the current mainstream.

Model Naming Convention (1FK7xxxxxxxxxxxxxxZ)

2. Complete Model List (by Frame Size / Shaft Height)
3. 20 mm Shaft Height (01 Series, 0.18–0.35 kW)

2. 30 mm Shaft Height (02 Series, 0.38–0.85 kW)

3. 40 mm Shaft Height (03/04 Series, 1.15–3 kW)

4. 60 mm Shaft Height (06 Series, 3–11 kW)

5. 80 mm Shaft Height (08 Series, 8–20 kW)

6. 100 mm Shaft Height (10 Series, 18–48 kW)

3. Special Custom Models (For KUKA Robots)

4. Encoder & Cooling Options
5. Encoder Types

Standard: DRIVECLiQ absolute encoder (20bit singleturn / 12bit multiturn)

KUKA dedicated: Resolver

Optional: Incremental encoder (2048 lines)

2. Cooling Methods

Standard: Selfcooled IC410 (IP65 protection)

Optional: Forcedair cooled IC416 (for continuous highload operation)

5. Replacement Model Guide
6. Generation replacement: Gen1 5A series → Gen2 2A series (e.g., 1FK70815AZ91 → 1FK70812AZ91), mounting dimensions and electrical interfaces remain compatible
7. Power upgrade: Same frame size, different length codes (e.g., 081 → 083, power from 12 kW to 16 kW)
8. Function upgrade: Standard → KUKA dedicated (requires 1ZZ9 mechanical interface and resolver)
9. Selection Guidelines
10. Power matching: Calculate required rated power and torque based on load; 20% margin recommended
11. Speed requirement: Confirm maximum speed meets application (standard 6000 rpm, some up to 8000 rpm)
12. Encoder selection: Absolute / incremental / resolver based on control system
13. Protection rating: Standard IP65, shaft IP67, suitable for harsh industrial environments
14. Custom requirements: For KUKA robots and special applications, select dedicated models with 1ZZ9 suffix and Z code