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R911284191 (MHD112A-058-NG1-LN)

MHD Synchronous Motors

  In-Stock, Ships 3-5 Days
Expedited Lead Times on Select Parts
1 Year Warranty Included
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Expedited Lead Times on Select Parts
1 Year Warranty Included
Free Ground Shipping
The Bosch Rexroth MPN R911284191 (MHD112A-058-NG1-LN) is a synchronous servo motor featuring a maximum speed of 3,500 RPM at a 60K temperature rise and utilizes liquid cooling. This motor, weighing 23 kg, includes F class insulation, an IP65-rated enclosure, and supports installation up to 1000 meters above sea level in ambient temperatures between 0 and 40 degrees Celsius. It incorporates a digital servo feedback encoder system for relative shaft position detection, along with an electronic-release holding brake providing 22 Nm of torque. Key specifications include a continuous standstill torque of 15 Nm, four pole pairs, a torque constant of 0.98 Nm/A, voltage constant of 89 V/1000 min, winding resistance of 0.86 Ohm, and a maximum theoretical torque of 54 Nm. The model is equipped with a power connector on the left-hand side, a plain shaft with seal, and an aluminum flange (130 mm centering diameter, 192 mm flange size) for secure mounting. The external coating is RAL 9005 black.

Technical Specifications

Weight
23kg

Insulation Class
F

Enclosure
IP65

Installation Height
1000 MSL

Ambient Temperature
0 to 40 degree Celsius

Peak Current
77 A

Winding Inductivity
7.8 mH

Pole Pairs
4

Torque Constant
0.98 Nm/A

Voltage Constant
89 V/1000 min

Winding Resistance
0.86 Ohm

Maximum Torque
54 Nm

Moment of Inertia
111.0 x 10-4 kgm2

Brakes
Electronically Released Holding Brakes.

Can the MHD112A-058-NG1-LN operate efficiently in vertical-axis applications?

Yes, its 22 Nm holding brake maintains load position during power-off, ideal for lifting or pressing tasks. This prevents unwanted movement and protects mechanical systems in vertical configurations.

How does the plain shaft with a shaft seal affect mechanical integration?

It allows direct coupling to gearboxes or pulleys while preventing lubricant or dust ingress. This design supports reliable operation in enclosed or moderately contaminated environments.

What is the practical effect of a 15 Nm continuous torque rating at standstill?

It means the motor can sustain significant load-holding or low-speed torque without overheating. This characteristic benefits processes like indexing tables or forming operations requiring constant torque.

Why is relative position detection suitable for short-cycle applications?

Relative encoders restart quickly without referencing, reducing cycle startup times. However, they may require re-homing after power loss, which is acceptable in frequent-stop environments.

What maintenance factor should be considered for liquid-cooled servo motors like the MHD112A-058-NG1-LN?

Coolant flow must remain unobstructed to prevent thermal buildup and efficiency loss. Regular inspection of cooling lines and seals minimizes downtime and leakage risks.

MHD112A058NG1LN

MHD112A 058 NG1 LN

mhd112a-058-ng1-ln

Internal Product Review

The MHD112A-058-NG1-LN servo motor from Bosch Rexroth Indramat combines a 22.0 Nm holding brake, liquid-cooling housing, and a digital HSF encoder. It delivers 15.0 Nm continuous torque at standstill, has a 192 mm flange and plain‐shaft design. In machine tools, packaging lines, and automation systems this servo excels.

Warranty

1-year-warranty
Indramat USA 1 Year Warranty

Repair

product repair We offer a repair service for the MHD112A-058-NG1-LN.
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