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Davis-Standard,LLC

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Direct Drive Extruders

Davis-Standard offers a complete range of energy efficient ECOTRUDERS. Our direct drive system is based on a Permanent Magnet Synchronous Motor (PMSM) technology that offers several advantages over conventional extruder drive and motor gear reducer systems.

The direct drive system eliminates the gear reducer, simplifying the extruder mechanical design. These motors provide very high torque densities compared to conventional AC and DC motors and produce high levels of torque at low operating speeds.

At A Glance

  • No gear oils
  • Energy efficient
  • Quiet operation
  • Small footprint
  • Low maintenance
  • Medical clean room friendly
  • Available sizes: 0.75-inch (20mm) to 5-inch (130mm) diameter extruders

 

Comparison Of Different Solutions

Energy Efficiency:

  • Up to 15 percent energy savings may be realized versus a conventional AC drive with gear reducer systems. A 2 1/2-inch (64mm) 30:1 extruder processing HDPE materials at 100 screw RPM will consume 10 percent less energy than a conventional AC drive with a gear reducer. The same 2 1/2-inch (64mm) 30:1 extruder processing PP materials at 100 screw RPM will consume 15 percent less energy than a conventional AC drive with a gear reducer.
  • Up to 25 percent energy savings may be realized versus a conventional DC drive with gear reducer systems. A 2 1/2-inch (65mm) 30:1 extruder processing HDPE materials at 100 screw RPM will consume 25 percent less energy than a conventional DC drive with a gear reducer. The same 2 1/2-inch (65mm) 30:1 extruder processing PP materials at 100 screw RPM will consume 25 percent less energy than a conventional DC drive with a gear reducer.

 

Noise Emission:  
Conventional Solution 
• Noise emission caused by gearcase 
• Noise emission caused by motor fan,   
especially with higher powered motors
Direct Drive Solution
• Quiet operation:
    – No gear reducer
    – Watercooled
    – Less than 80 dBA
Space Requirements:  
Conventional Solution  
• Motor gear reducer combination requires 
larger footprint    

 
Direct Drive Solution
• Compact extruder configuration
for coextrusion applications
Service & Maintenance:  
Conventional Solution 
• Regular maintenance required:  
    – Gear reducer (oil changes)  
    – DC motors (brush replacement) 
• Oil leaks possible
Direct Drive Solution
• Low maintenance
• Longer lifetime of motor
• Oil free system possible