Motor sizing and voltage-dependent performance
The SH30703P1BA4000 is a three-phase servo motor from the SH3 series, sized for applications needing 1330 W continuous power at 400 V or 480 V three-phase supply. At 230 V single-phase input, the nominal output power drops to 830 W. Nominal speed varies with the supply: 3000 rpm at 230 V single-phase, 6000 rpm at 400 V three-phase, and 7200 rpm at 480 V three-phase. The nominal torque follows the same pattern — 2.8 N.m at 230 V, 2.1 N.m at 400 V or 480 V. Peak stall torque reaches 11.3 N.m across the 115...480 V three-phase range, roughly 4× the continuous stall torque of 2.94 N.m. That headroom handles short-duration acceleration and deceleration without oversizing the motor frame.
Encoder, feedback, and cabling
The motor carries an absolute multiturn Hiperface DSL encoder — a single-cable digital interface that carries both power and feedback over one hybrid cable, eliminating a separate encoder cable run. This simplifies cable management on moving axes and reduces the number of connector points that can fail. Electrical connection uses a straight connector (primary) with a quicklock rotatable right-angled connector option. The right-angle variant helps in tight cable-tray or drag-chain layouts where the straight connector would exceed the clearance envelope.
Mechanical interface and environmental rating
The motor flange is 70 mm (IEC metric standard) with a 60 mm centring collar and 5.5 mm mounting holes. The shaft is 14 mm diameter with a parallel key, 30 mm shaft length, and 5 mm key width — mates with standard couplings and pulleys in that bore range. The shaft bushing is rated IP54 without the shaft seal ring, so a shaft seal accessory is needed if the motor is mounted shaft-up in a direct-spray area. Cooling is by natural convection — no external fan. The motor relies on its surface area and the mounting flange for heat dissipation. In a confined enclosure or at low speeds where self-ventilation is minimal, the continuous torque may need derating.
Thermal and electrical parameters for drive tuning
Stator resistance is 2.7 Ohm and inductance is 14.6 mH, giving an electrical time constant of about 5.4 ms — the current loop in the servo drive must be tuned to this time constant for stable torque control. The torque constant is 0.72 N.m/A at 120°C copper temperature; use this hot value rather than the room-temperature figure for thermal sizing of the drive's continuous current rating. Maximum continuous current is 17.0 A, which matches the 3-second peak current rating — the drive must be capable of supplying 17.0 A continuously, not just in bursts. Back EMF constant is 49 V/krpm at 20°C; at 6000 rpm the motor generates 294 V back EMF, so the drive's DC bus must stay above that voltage to maintain current control at full speed.