Motor ratings — what the numbers mean for your load
The SH32051P02A1100: This SH3-series servo motor delivers 5.5 kW continuous power at 400 V three-phase, but the same motor also runs on single-phase 115 V or 230 V with reduced output — 2510 W and 4240 W respectively. At 480 V three-phase it's 5200 W, so the 400 V rating is the ceiling for full power. Nominal torque drops as voltage increases: 31.9 N.m at 115 V single-phase, 27 N.m at 230 V single-phase, 17.5 N.m at 400 V three-phase, and 13.8 N.m at 480 V three-phase. That inverse relationship means if you're running on a 480 V line, you lose about 21% torque compared to the 400 V rating — factor that into your acceleration profile. Peak stall torque is 110 N.m across the three-phase range (115...480 V), and continuous stall torque sits at 36.9 N.m. The 3:1 ratio between peak and continuous tells you the motor can handle short bursts of high torque — useful for indexing or clamping applications, but not for sustained overload.
Encoder feedback — absolute multitrack for position hold
The absolute multiturn SinCos Hiperface encoder gives you position data on power-up without a homing sequence — critical if the machine loses power mid-cycle and needs to resume from the last known position. The SinCos analog track also provides velocity feedback with higher resolution than a pure digital encoder, which helps with low-speed ripple. The back EMF constant is 104 V/krpm at 20°C — that's the voltage the motor generates when spun by the load. If your drive's DC bus can't handle that back-EMF at maximum speed, you'll get overvoltage faults. Check the drive's voltage rating against the motor's speed-torque curve.
Environmental sealing and cooling — where it can live
The shaft bushing seal is the weak point in many motors; here it's rated the same as the housing. Cooling is by natural convection — no fan. That means the motor relies on airflow around the housing, so mounting it in a tight enclosure or near heat sources will derate the continuous torque. Ambient temperature matters more than with a fan-cooled motor.
The sizing reference SH32051P ties this to a known family, so if you need a variant with a different encoder or brake option, the same mechanical frame (flange size 205 mm, shaft 38 mm diameter) is shared across the series.