RexrothR911286080AC Synchronous Servo Motor – 12.0 Nm Continuous Stall Torque, 5000 rpm, 140 mm Flange, Keyed Shaft

Product Description

What this part is

Bosch Rexroth Indramat MHD090B-047-NP0-UN digital AC synchronous servo motor, material number R911286080. Series: MHD. Motor Size: 090. Motor Length: B. Winding Code: 047. Flange Size: 140 mm. Continuous Torque at Standstill: 12.0 Nm. Maximum Speed: 5000 rpm. Peak Current: 59.4 A. Number of Pole Pairs: 4. Winding Inductance: 10.1 mH. Encoder Type: digital servo feedback (HSF). Type of Position Detection: relative. Cooling: natural convection. Holding Brake: none. Shaft Design: keyed shaft. Mass: 14 kg (30.9 lb). Country of Origin: Germany.

Decoding the designation

MHD — Indramat digital AC synchronous servo motor series.

090 — 090 frame size, on a 140 mm square mounting flange.

B — the B stack length within the 090 frame.

047 — winding code 047, which fixes the torque and speed pairing at 12.0 Nm and 5000 rpm.

N — natural convection cooling, run from the housing surface with no fan and no coolant circuit.

P — digital servo feedback (HSF) encoder, relative position detection.

0 — built without a holding brake.

UN — keyed output shaft to DIN 6885-1 with a shaft sealing ring, and a power connector turnable through 270°.

What these specs mean in practice

Continuous Torque at Standstill: 12.0 Nm. That is the torque the motor holds indefinitely at zero speed, which is the figure a servo axis is sized on for clamping, gravity-loaded vertical moves and dwell under load.

Peak Current: 59.4 A. Short-duration current headroom of roughly five times the continuous rating, which is what produces the acceleration torque on a fast index or a rapid traverse.

Maximum Speed: 5000 rpm. Number of Pole Pairs: 4. Four pole pairs give the electrical frequency an Indramat drive expects at that speed and place the motor in the middle of the torque-density against top-speed trade: more torque per amp than a two-pole-pair machine, more usable speed than a six.

Cooling: natural convection. Heat leaves through the housing surface alone, so the motor runs silently and adds no fan, filter or coolant loop to the machine.

Winding Inductance: 10.1 mH. Higher winding inductance smooths current ripple from the drive’s switching and is a value the drive’s current loop is tuned against.

Mounting data

Flange Size: 140 mm. Shaft Design: keyed shaft to DIN 6885-1 with a shaft sealing ring. Power Connection Direction: turnable within a range of 270°. Maximum Installation Elevation: 1000 m above sea level. Mass: 14 kg (30.9 lb).

Quantity and configuration

Unit Quantity: 1 Pc. One motor, supplied without a holding brake and with the digital servo feedback encoder fitted.

Interchange guidance

Material number R911286080 and type code MHD090B-047-NP0-UN identify the same motor. Searchable variants of the number: R-911 286 080, R911 286 080, MHD090B047NP0UN, MHD 090B-047-NP0-UN, MHD-090B-047-NP0-UN.

Within the same frame, MHD090B-035-NP0-UN carries the 035 winding rather than the 047, so it shares the flange and shaft but pairs different torque and speed values — a related size, not an equivalent. The PP0 and PP1 variants of MHD090B-047 differ at the encoder and brake positions.