ST SERIES · 380 V
ST Air-Cooled Servo Motors
High-voltage permanent-magnet servo motors from 12.5 kW to 76 kW for presses, extruders, heavy rotary tables and machine-tool axes that run continuously.
High torque in a standard frame
380 V windings keep the current low, so the drive and cables stay compact while the motor holds 70 to 363 N·m continuously — the range where 220 V motors would need a step-up transformer.
Model range
Eighteen standard ratings in two frame sizes — 190ST for 70–140 N·m and 260ST for 156–363 N·m — at 1000, 1500, 1700 and 2000 r/min base speeds.
| Model | Rated power | Rated speed | Rated torque | Peak torque | Rated current | Peak current | Encoder | Protection | Weight |
|---|---|---|---|---|---|---|---|---|---|
| 190ST-X14720F | 14.7 kW | 2000 r/min | 70 N·m | 210 N·m | 26 A | 83 A | 1-pole-pair resolver | IP54 | 49.8 kg |
| 190ST-X17620F | 17.6 kW | 2000 r/min | 84 N·m | 252 N·m | 32 A | 99 A | 1-pole-pair resolver | — | 58.4 kg |
| 190ST-X20120F | 20.1 kW | 2000 r/min | 96 N·m | 288 N·m | 36 A | 114 A | 1-pole-pair resolver | — | 69.8 kg |
| 190ST-X22220F | 22.2 kW | 2000 r/min | 106 N·m | 318 N·m | 40 A | 127 A | 1-pole-pair resolver | — | 70.6 kg |
| 190ST-X25120F | 25.1 kW | 2000 r/min | 120 N·m | 360 N·m | 45 A | 145 A | 1-pole-pair resolver | — | 79.5 kg |
| 190ST-X29320F | 29.3 kW | 2000 r/min | 140 N·m | 420 N·m | 52 A | 165 A | 1-pole-pair resolver | — | 80.5 kg |
| 260ST-X24515F | 24.5 kW | 1500 r/min | 156 N·m | 468 N·m | 44 A | 136 A | 1-pole-pair resolver | IP54 | 115 kg |
| 260ST-X28517F | 28.5 kW | 1700 r/min | 160 N·m | 480 N·m | 54 A | 167 A | 1-pole-pair resolver | — | 116 kg |
| 260ST-X42517F | 42.5 kW | 1700 r/min | 239 N·m | 717 N·m | 76 A | 235 A | 1-pole-pair resolver | — | 133 kg |
| 260ST-X55217F | 55.2 kW | 1700 r/min | 310 N·m | 930 N·m | 107 A | 331 A | 1-pole-pair resolver | — | 162 kg |
| 260ST-X34510F | 34.5 kW | 1000 r/min | 330 N·m | 990 N·m | 62 A | 192 A | 1-pole-pair resolver | — | 163 kg |
| 260ST-X57015F | 57 kW | 1500 r/min | 363 N·m | 1089 N·m | 108 A | 345 A | 1-pole-pair resolver | — | 180 kg |
| 260ST-X32720F | 32.7 kW | 2000 r/min | 156 N·m | 468 N·m | 56 A | 180 A | 1-pole-pair resolver | IP54 | 115 kg |
| 260ST-X43520F | 43.5 kW | 2000 r/min | 208 N·m | 624 N·m | 77 A | 247 A | 1-pole-pair resolver | — | 124 kg |
| 260ST-X50020F | 50 kW | 2000 r/min | 239 N·m | 717 N·m | 88 A | 282 A | 1-pole-pair resolver | — | 133 kg |
| 260ST-X65020F | 65 kW | 2000 r/min | 310 N·m | 930 N·m | 117 A | 374 A | 1-pole-pair resolver | — | 162 kg |
| 260ST-X69020F | 69 kW | 2000 r/min | 330 N·m | 990 N·m | 124 A | 397 A | 1-pole-pair resolver | — | 163 kg |
| 260ST-X76020F | 76 kW | 2000 r/min | 363 N·m | 1089 N·m | 133 A | 412 A | 1-pole-pair resolver | — | 180 kg |
Encoder: 1-pole-pair resolver as standard, absolute encoder optional. Insulation class F. Natural air cooling with axial fan options; 380 V three-phase. Ratings outside this table on request.
Why 380 V
No step-down transformer and lower cable current: the same torque at roughly a third of the current of a 220 V motor, so cabinets stay small.
Continuous duty
Cast frame with cooling ribs and class F insulation, built for 100 % duty cycles rather than short indexing moves.
Resolver feedback
Rugged resolver feedback survives heat, oil mist and vibration; absolute encoders available when the controller needs multi-turn position.
Kit with drive
Supplied as motor + drive + cable set so commutation, current limits and braking are already matched.
Detail data
Full electrical data (all models)
| Specification | 190ST-X14720F | 190ST-X17620F | 190ST-X20120F | 190ST-X22220F | 190ST-X25120F | 190ST-X29320F | 260ST-X24515F | 260ST-X28517F | 260ST-X42517F | 260ST-X55217F | 260ST-X34510F | 260ST-X57015F | 260ST-X32720F | 260ST-X43520F | 260ST-X50020F | 260ST-X65020F | 260ST-X69020F | 260ST-X76020F |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rated current (A) | 26 | 32 | 36 | 40 | 45 | 52 | 44 | 54 | 76 | 107 | 62 | 108 | 56 | 77 | 88 | 117 | 124 | 133 |
| Peak current (A) | 83 | 99 | 114 | 127 | 145 | 165 | 136 | 167 | 235 | 331 | 192 | 345 | 180 | 247 | 282 | 374 | 397 | 412 |
| Kt (N·m/A) | 2.9 | 2.9 | 2.9 | 2.8 | 2.8 | 2.9 | 3.6 | 3.1 | 3.4 | 3 | 5.4 | 3.5 | 2.9 | 2.8 | 2.8 | 2.8 | 2.8 | 2.9 |
| Line inductance (mH) | 5.3 | 4.81 | 3.9 | 3.16 | 2.98 | 2.69 | 5.55 | 4.13 | 3.86 | 1.88 | 6.32 | 1.68 | 3.49 | 5.22 | 3.2 | 1.58 | 1.57 | 1.52 |
| Electrical time constant (ms) | 9.6 | 10.6 | 11.2 | 13.1 | 11.9 | 13.2 | 27.6 | 28.5 | 31.8 | 34.1 | 34.6 | 41.9 | 29.5 | 32.8 | 32.5 | 34.4 | 37.3 | 34.4 |
| Pole pairs | 4 | — | — | — | — | — | 4 | — | — | — | — | — | 4 | — | — | — | — | — |
| Body length L (mm) | 467 | 500 | 534 | 534 | 580 | 628 | 515 | 515 | 619 | 667 | 667 | 717 | 515 | 567 | 619 | 667 | 667 | 717 |
Working on a retrofit?
Tell us the existing motor flange and torque demand — we match the frame and the drive instead of guessing.