Note: While I cannot link directly to a PDF, this write-up contains the critical information found in the official datasheet.

Key Specifications (typical)

  • Model: ES08MA II
  • Type: Micro analogue servo (standard 3-wire PWM control)
  • Case material: Plastic with metal gears (metal gear train)
  • Weight: ~12–13 g
  • Dimensions: 22.8 × 11.6 × 26.6 mm (approx.)
  • Operating voltage: 4.8–6.0 V (nominal); safe operation often specified at 4.8 V and 6.0 V
  • Recommended supply: 5–6 V regulated battery or BEC
  • Stall torque:

    The EMAX ES08MA II datasheet provides detailed specifications and characteristics of the motor. Here's a breakdown of the key parameters:

    Part 6: Gear Train and Material Analysis

    One of the main selling points of the ES08MA II is its metal gear train. Let's disassemble (conceptually) the gear stages:

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    • Shaft Diameter: 3mm
    • Shaft Length: 10mm
    • Motor Connector: JST-XH 4P
    • Phase Resistance: 0.012Ω
    • Inductance: 0.034mH

    Key Features

    • Metal Gears – Alloy metal output gear and internal gears for enhanced crash resistance and longer lifespan compared to nylon gears.
    • Coreless Motor Option – Note: The ES08MA II typically retains a standard 3-pole motor (not coreless) to keep cost low, but check vendor specifics.
    • Dual Ball Bearings – One on the output shaft and one on the case top for smooth, friction-reduced rotation.
    • Compact & Light – Standard micro servo size with a weight of approximately 12–13g (including wires and horn).
    • Analog Control – Standard 50Hz PWM (Pulse Width Modulation) signal; requires a constant refresh signal.