Sigma Integrale DK2+ Motion System Review By The SRG

Barry Rowland of the Sim Racing Garage presents his review of the DK2+ Actuator Kit by Sigma Intégrale.

US-based Sigma Intégrale is a technology, research, and development company for the automotive and truck markets. The professional DK-2 motion system is a motion solution for sim-racing enthusiasts, racing professionals, and researchers.

The DK2+ system uses larger motors and actuators and is able to support more weight than the regular DK2 units. The larger motors offer a more powerful and toque-y feel than the regular DK2 and produce a better quality ride. The DK2+ is recommended for all sim centers or similar commercial applications.

The DK2+ motion system is a professional motion system for serious sim-racing enthusiasts, drivers, and researchers. The system shares the same design and construction as our industrial-grade motion systems used in the Sigma Intégrale our full-motion vehicle simulators. Additionally, DK2+ is mechanically and electrically engineered around our unique motion algorithm to provide the most realistic and representative vehicle motion feedback.

DK2+ takes a modern approach to our signal processing and motion control to create the most responsive system on the market. Every elevation change, vehicle movement, surface change, and gear shift, is captured and reproduced within 2” (50mm) of the available mechanical stroke.

The Sigma Intégrale DK2 3-actuator Motion System is available via the official website for $5,280.00 + shipping. The DK2 4-actuator Motion System is on sale for $6,695.00 + shipping.

DK systems are built to order, and take 3-5 business days for assembly and testing before shipping.

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Official Webpage – www.sigmaintegrale.com

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What’s included:

• mono-block, machined billet actuators with 2” (50 mm) travel
• powerful, responsive, and compact American Teknic servo motors
• Total weight capacity (for optimal performance), including a fully-loaded simulator with a driver:
  • 3-actuator system = 600 lb (272 kg)
  • 4-actuator system = 800 lb (363 kg)
• billet-machined floating feet with large rubber pads
• aluminum t-slot (80/20) mounting hardware compatible with 25 to 45 series profiles
• single motion controller box (115v/240V compatible) with power and network cables
• two sets of 1m and 2m data and power cables from the controller to actuators
• Sigma’s VelocityTrap™ motion control algorithm & simulation software
• automatic Over-the-Air controller firmware updates

Compatibility:

• Automobilista 2 | requires enabling the shared memory option in-game settings
• Assetto Corsa
• Assetto Corsa Competizione
• DiRT Rally 2.0 | must update the hardware settings configuration file
• iRacing
• Project CARS 2 | requires enabling the shared memory option in-game settings
• Project CARS 3 | requires enabling the shared memory option in-game settings
• RaceRoom Racing Experience
• rFactor 2 | requires adding a Sigma rFactor 2 plugin

Upcoming Integrations:

• Digital Combat Simulator World (DCS World)
• Microsoft Flight Simulator
• IL-2 Sturmovik
• F1 2021
• BeamNG

Actuators:

• 100% designed, manufactured, assembled, and tested in California, USA
• Utilizes the largest American-made ball screw and nut in the industry for maximum durability
• Mono-block in structure using a CNC machined billet aluminum to ensure concentricity and accuracy
• 2″ (50mm) in piston diameter for large side-loading capability
• T-slot aluminum extrusion (80/20) friendly
• 16 lbs each (7.26kg) with the larger DK2+ motor

Latency:

• PC side (Windows 10)
  • Game physics engine @ 333 Hz: 3 ms
  • Windows OS response: 1 ms average
  • Sigma 10-layers algorithm: 1 ms
  • Send target positions via Ethernet: 0.3 ms
• Controller side (Real-time OS in ARM)
  • Response to new position targets: < 1 microseconds
  • Motion Algorithm for a smooth motion: Average: 25 ms, Range: 0 to 50 ms
  • Send motion data to 1st micro-controller at 1000 Hz: 1 ms
• Controller side (2 low-latency micro-controllers)
  • Send motion data from 1st micro-controller to 2nd: 0.1 ms
  • Digital pulse generation: 0.002 ms
• Electrical connection from 2nd micro-controller to ClearPath motor
  • 3V to 5V conversion: 2 ms
• ClearPath servo motor
  • Digital pulse signal to actual motion: 1 ms

Technical Specifications:

• ClearPath Integrated Servo Motor CPM-SDSK-3432P-RLN
  • Rated (RMS) Torque = 209 oz-in (1.5 N-m)
  • Peak Torque = 698 oz-in (4.9 N-m)
  • Max Speed = 2,380 rpm
  • Total Weight Capacity (for optimal performance), including a fully-loaded simulator with driver:
    • 3-actuator system = 600 lb (272 kg)
    • 4-actuator system = 800 lb (363 kg)
  • Optically isolated, current-based I/O system (EMI free)
  • The total system draw at 110V is about 330 W/h
• In-house manufactured actuators | 3D Model: DK2+ Actuator STEP File 
  • 2” (50mm) actuator travel
  • speeds of 7.93″/s @ 2,380 rpm
  • 5/8” diameter, USA ball screw, and nut
  • 2” (50mm) diameter piston
  • Mono-block machined billet aluminum body
  • All American made components
• Motion Controller | 3D Model: Controller Case STEP file
  • ClearPath IPC-5 Intelligent Power Supply
  • Input voltage 95-125/190-250 VAC; 50-60Hz (NO INVERTERS REQUIRED!)
  • Real-time and remote motion control via default browser or phone/tablet
  • Signal processor with an amplifier
  • Embedded microcontrollers
  • Shielded Molex connectors
  • 15″ wide, 9.25″ deep, and 3″ tall
• VelocityTrap
  • Supports Assetto Corsa and iRacing
  • Ultra-responsive, precise motion control
  • 10 layers of motion integration
  • Real-time remote control
  • Self-balancing (cross balance)
• Mounting hardware
  • Machined billet mounting bracket
  • T-slot aluminum extrusion (80/20) friendly
  • Machined billet floating feet with mounting capability