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Kollmorgen S7240F-NANANA

Product Introduction:
The S7240F-NANANA is a compact AC servo motor from Kollmorgen’s S72 product family with a 40 mm frame size and flange mounting configuration. The suffix breakdown: “F” = flange mount, “NA” = no brake (no holding brake), “NA” = no keyway (smooth shaft), “NA” = standard winding. This motor is designed for space-constrained applications requiring smooth shaft output and no holding brake.

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Detailed content

Model Series: S72 Series

Technical Specifications:

Parameter Value
Frame Size 40 mm
Motor Type AC Synchronous Servo Motor
Encoder Type Incremental (A/B/Z, 2500 lines/rev standard)
Rated Torque 0.18 Nm (continuous)
Peak Torque 0.54 Nm
Rated Speed 3000 RPM
Max Speed 5000 RPM
Rated Power 0.057 kW (continuous)
Peak Power 0.17 kW
Rated Voltage 325 VDC bus
Phase Current (RMS) 0.6 A (continuous)
Phase Current (Peak) 1.8 A
Winding Inductance 0.8 mH
Winding Resistance 8.5 Ω
Rotor Inertia 0.00003 kg·m²
Weight 0.38 kg
IP Rating IP40 (with connector)
Cooling Method Conduction / Natural Convection
Shaft Diameter 8 mm (smooth, no keyway)
Shaft Length 20 mm

Structural Features:

  • Compact 40 mm outer diameter cylindrical design
  • Front flange mounting with 4 bolt holes (M3)
  • Smooth shaft (no keyway) for friction-based or clamping hub connections
  • No holding brake for minimal inertia and fast response
  • Precision ball bearings (sealed)
  • Rear-mounted incremental encoder with 5-pin M12 connector

Material Composition:

  • Stator Core: Silicon steel laminations (0.2 mm thickness)
  • Rotor Magnets: Neodymium Iron Boron (NdFeB, N42SH grade)
  • Shaft: Stainless steel (AISI 303)
  • Housing: Aluminum alloy (6061-T6)
  • Bearings: Stainless steel sealed ball bearings
  • Windings: Class F insulation (155°C rating), copper wire

Working Principle:
Three-phase PMSM operation. The servo drive sends PWM-synthesized three-phase currents to the stator windings, creating a rotating magnetic field. The NdFeB permanent magnet rotor synchronously follows this field, producing torque. The incremental encoder provides relative position feedback (A/B quadrature + Z index) to the drive for velocity and position control. The smooth shaft eliminates backlash in coupling applications.

Functional Features:

  • Ultra-low rotor inertia (0.00003 kg·m²) for fastest acceleration
  • Smooth shaft eliminates keyway backlash
  • No brake reduces motor length and weight
  • Incremental encoder for cost-effective positioning
  • Compatible with AKD, AKD-P, and AKD2G drives

Advantages:

  • Smallest frame in S72 family (40 mm) for tight space integration
  • Zero-backlash smooth shaft ideal for precision coupling
  • Extremely low inertia enables highest acceleration rates
  • Lightweight at 0.38 kg
  • No brake reduces power consumption and heat generation

Applicable Industries:

  • Pick-and-place machines
  • Small robot joints
  • Medical device actuators
  • Optical equipment (lens positioning)
  • Semiconductor wafer handlers
  • Laboratory automation

Installation Requirements:

  • Mount using 4× M3 bolts on front flange (torque: 0.8 Nm)
  • Use clamping hub or friction coupling on smooth shaft (no set screws)
  • Align shaft to load within 0.02 mm TIR
  • Connect encoder cable via M12 connector (max 10 m recommended)
  • Ensure minimum 20 mm clearance around motor body for airflow

Usage Notes:

  • Do not use set screws on smooth shaft — use clamping hub only
  • Maximum continuous ambient temperature: 40°C
  • Do not exceed 3000 RPM continuous speed
  • Derate torque by 15% above 40°C ambient

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