Portescap 17S78 Brush DC Coreless Motor 17S78-209E.1

The 17S78-209E.1 is a 17 mm diameter brush DC coreless motor with precious metal commutation, designed for compact high-performance applications. It operates at a nominal voltage of 12 V, delivers a no-load speed of 12,430 rpm, and provides a stall torque of 5.9 mNm. The motor achieves a maximum efficiency of 78% and sustains a continuous torque of 2.8 mNm at a maximum continuous current of 0.32 A. Its terminal resistance is 18.6 Ω, with a back-EMF constant of 0.95 mV/rpm and torque constant of 9.10 mNm/A. The rotor inertia is 0.50 g⋅cm², and the mechanical time constant is 11.3 ms. The motor has a nine-segment commutator, weighs 19 g, and operates within a temperature range of -30°C to 85°C. Shaft load limits are 1.5 N radial and 100 N axial, with axial play not exceeding 0.15 mm. Thermal resistance is 13°C/W for the rotor and 38°C/W for the body.