Servo Motor Sizing: direct_drive
Servo motor sizing data for brushless AC permanent-magnet, hybrid stepper-servo, and direct-drive motors across NEMA 17/23/34/42 and IEC 42–180 mm frame sizes. Fields include continuous and peak torque, rated/max speed, rotor inertia, torque constant (Kt), back-EMF constant (Ke), winding resistance, thermal time constant, encoder resolution, weight, shaft diameter, voltage class, and IP rating. Based on Yaskawa Sigma-7, Siemens 1FK7, Beckhoff AM8000, Kollmorgen AKM, Allen-Bradley Kinetix MPL, NEMA MG-1 Part 30, IEC 60034-1.
| motor type | record id | IP rating | back emf constant V per krpm (V/krpm) | continuous torque Nm (Nm) | encoder resolution counts per rev (counts/rev) | frame iec mm (mm) | max speed rpm (rpm) | max winding temp C (degC) | notes | peak to cont ratio | peak torque Nm (Nm) | rated speed rpm (rpm) | rotor inertia kg cm2 (kg·cm2) | shaft diameter mm (mm) | thermal time constant min (min) | torque class | torque constant Nm per A (Nm/A) | typical applications | voltage class | weight kg (kg) | winding resistance ohm (ohm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| direct_drive | IEC100_DD01 | IP54 | 2,133 | 30 | 16,777,216 | 100 | 600 | 155 | Direct drive frameless/housed; zero backlash; 24-bit SinCos encoder; very high inertia; suited for load inertia up to 10x motor | 3 | 90 | 300 | 180 | 30 | 90 | 10-50 | 22.92 | rotary table, index dial, test stand turntable | 400VAC | 22 | 0.08 |
| direct_drive | IEC130_DD01 | IP54 | 5,672 | 80 | 16,777,216 | 130 | 500 | 155 | Direct drive high-torque; 24-bit multiturn absolute; very high inertia; low cogging design | 3 | 240 | 200 | 650 | 40 | 120 | 50-200 | 60.95 | precision rotary table, CT scanner, semiconductor wafer handling | 400VAC | 55 | 0.03 |
| direct_drive | IEC180_DD01 | IP54 | 14,182 | 200 | 16,777,216 | 180 | 400 | 155 | Direct drive very large frame; peak 300% for 2s; liquid cooled optional; Beckhoff AM8871 class | 3 | 600 | 150 | 2,500 | 55 | 150 | 200+ | 152.38 | large rotary table, industrial centrifuge, amusement ride | 400VAC | 135 | 0.01 |
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