PN:451261010401 / M2703-60004 Philip Avalon FM20 / FM30 Fetal Monitor – Recorder Stepper Motor

PN:451261010401 / M2703-60004 Philip Avalon FM20 / FM30 Fetal Monitor – Recorder Stepper Motor

2. Electrical & Mechanical Specifications

• Motor Type: 2-phase, 4-wire stepper motor
• Operating Voltage: DC 12 V (internal monitor supply)
• Gear Ratio: 5:1 (N37 gearbox)
• Step Angle: 7.5°/step (after gear reduction: 1.5°/step)
• Rated Current/Phase: 0.67 A
• Phase Resistance: 5.6 Ω
• Phase Inductance: 4.2 mH
• Holding Torque: 8.3 kg-cm (≈0.81 N·m)
• Output Shaft: D-shaft (fits paper roller)
• No-load Speed: approx. 50 RPM @ 12 V
• Selectable Paper Speed: 1 cm/min, 2 cm/min, 3 cm/min

3. Physical Dimensions

• Size: Ø 37 mm, length 45 mm (including gearbox)
• Weight: approx. 110 g
• Insulation Class: Class B
• Wiring: 4 wires (red, blue, brown, white) with dedicated connector

4. Function & Compatibility

• Purpose: Drives the built-in thermal recorder for printing FHR and tocograms.
• Compatible Models: Philip Avalon FM20, FM30 (M2702A / M2703A)