R911281235 (MHD090B-035-PG1-UN)

Name: R911281235 (MHD090B-035-PG1-UN)
Brand: Indramat Motors
SKU: MHD090B-035-PG1-UN
Price: 735.00 USD
Availability: InStock
Rating: 4.1 (6 reviews)

MHD Synchronous Motors

Rated 4.1 stars (6 total reviews)

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Current response time:

5 Minutes 48 Seconds

Phone:
1-888-551-3082

Email:
sales@indramat-usa.com

The Bosch Rexroth R911281235 (MHD090B-035-PG1-UN) is a synchronous servo motor equipped with a plain shaft and shaft seal, featuring liquid, surface, or natural cooling options. It delivers a continuous torque at standstill of 12.0 Nm and a maximum torque of 43.5 Nm, with a rotor moment of inertia of 43.0 x 10⁻⁴ kg·m². Rated current is 4.7–6.7 A (natural cooling) and 9.7 A (surface cooling), with power output up to 5.9 kW and rated voltage of 354–399 V at 200 Hz. The motor incorporates a digital absolute encoder capable of position detection beyond 4096 revolutions. The holding brake torque is 11.0 Nm. Its maximum speed is 5000 min⁻¹, and it has an IP65 protection rating. The unit has a motor length “B,” flange size of 140 mm, centering diameter of 110 mm, and total mass of 14 kg. It is classified under insulation class F according to DIN VDE 0530 Part 1 and is suitable for ambient temperatures from -20°C to +80°C. Connections for power and feedback are provided via connectors that are turnable within a 270° range.

Technical Specifications

Cooling System Types
Natural, Surface, Liquid

Rated Current (Natural Cooling)
4.7A to 6.7A

Rated Current (Surface Cooling)
9.7A

Rated Performance (Natural Cooling)
2.8Kw to 4.0Kw

Rated Performance (Surface Cooling)
5.9Kw

Rated Voltage (Surface Cooling)
399V

Rated Voltage (Natural Cooling)
354V to 369V

Rated Frequency
200Hz

Theoretical Maximum Torque
43.5Nm

Moment of Inertia of Rotor
43.0 x 10-4 kgm2

Minimum Strand Cross-section (Surface & Natural Cooling)
1.0 mm2

Time Constant (Natural Cooling)
60 min

Time Constant (Surface Cooling)
30 min

Maximum Speed
5000 min-1

Mass
14kgs

Storage Temperature Range
-20 to +80°C

Ambient Temperature Range
0 to 40°C

Maximum Permissible Attitude
1000 meters above sea level

Degree of Protection
IP65

Insulation Class
F (DIN VDE 0530 Part 1)

Frequently Asked Questions

Why is continuous torque at standstill significant for servo applications?

It ensures the motor maintains stable force without movement, critical in holding or pressing operations. This improves control in robotics and machining where static load must be managed.

How does the MHD090B-035-PG1-UN’s holding brake improve safety?

It mechanically locks the shaft during power-off conditions. This prevents axis drift in vertical or load-bearing systems.

What role does the plain shaft design play in coupling selection?

It requires external couplings or pulleys for torque transfer. This gives flexibility in adapting to different machine requirements.

How do flange size and centering diameter impact mounting?

They define compatibility with machine frames and alignment accuracy. Proper fit minimizes vibration and ensures transmission precision.

How does digital servo feedback improve integration with controllers?

It enables fast communication and accurate closed-loop control. This reduces positioning errors and improves synchronization across multiple axes.

Common Misspellings

MHD 090B 035 PG1 UN

MHD 090B-035-PG1-UN

MHD-090B-035-PG1-UN

MHD090B-035-PGI-UN

MHD090B035PG1UN

MHDO9OB-O35-PG1-UN

MHD090B 035 PG1 UN

mhd090b-035-pg1-un

MHD90B-035-PG1-UN

Internal Product Review

The MHD090B-035-PG1-UN servo motor by Bosch Rexroth Indramat outputs 12.0 Nm continuous torque and carries an 11.0 Nm holding brake. It features a 270° rotatable connector and plain shaft of 140 mm flange / 110 mm centering. It finds use in CNC machining centres, automated assembly lines, and robotics where precise multi-turn positioning is critical.