R911306708 (MHD112C-058-NP3-AN)

MHD Synchronous Motors

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The R911306708 (MHD112C-058-NP3-AN) servo motor from Bosch Rexroth is a synchronous motor designed for industrial automation applications. It delivers a maximum speed of 4500 RPM and provides a continuous standstill torque of 38 Nm with a continuous current of 53.2 A at 60K. The motor supports natural and liquid cooling, with a thermal time constant of 40 minutes for surface cooling, and a rated power output of 19.4 kW at 3500 RPM and 276 V. Key features include a keyed shaft with seal, a holding brake rated at 70 Nm, digital servo feedback (HSF) for relative position detection, a winding resistance of 0.12 Ω, inductivity of 1.5 mH, centering diameter of 130 mm, flange size of 192 mm, and a motor mass of 45 kg.

Technical Specifications

Maximum Rotational Speed
4500 RPM

Moment of Inertia
273 x 10-4 kgm2

Feedback Type
Digital Servo Feedback

Constant Torque (Natural Cooling)
38 Nm

Continuous Current (Natural Cooling)
53.2 A

Rated Power (Surface Cooling)
19.4 kW

Rated voltage
276 volts

Rated Rotation Speed
3500 RPM

Rated Current Consumption (Natural Cooling)
17.9 A

Optimal Performance Temperature
+40 degrees Celsius

Winding Resistance
0.12 Ohms

Winding Code
058

Winding Inductivity
1.5 mH

Number of Polar Pairs
4

Torque Constant
0.8 Nm/A

Voltage Constant
72.7 V/1000 min-1

Rated Torque (Natural Cooling, 60 K)
15.3 Nm

Rated Power (Natural Cooling, 60K)
3.9 kW

Voltage Consumption (Natural Cooling, 60K)
133 Volts

Current Consumption (Natural Cooling, 60K)
15.2 A

Thermal Time Constant (Surface Cooling)
40 minutes

Weight (Without Accessories)
45 kg.

Frequently Asked Questions

How does the HSF digital servo-feedback on MHD112C-058-NP3-AN aid commutation accuracy and servo stiffness?

The HSF provides high-resolution, digital position data with deterministic timing for minimizing phase error for field-oriented control. Its cleaner electrical signaling improves loop gain and disturbance rejection versus analog interfaces, especially over longer cable runs.

What advantages do the keyed shaft and shaft seal provide in MHD112C-058-NP3-AN for drivetrain reliability?

The keyed interface creates a defined shear plane that prevents micro-slip under cyclic torque for preserving coupling alignment. Its seal limits lubricant and coolant ingress to stabilize bearing life and maintains encoder cleanliness in washdown or mist-laden environments.

How does liquid cooling on the MHD112C-058-NP3-AN influence continuous torque and thermal stability during demanding duty cycles?

It removes heat directly from the stator housing for keeping copper and magnet temperatures in a controlled band so the motor sustains rated standstill torque. Its lower winding resistance drift also sharpens current control and reduces thermal derating over long cycles.

Why is a 70 Nm holding brake valuable for vertical or safety-related axes on MHD112C-058-NP3-AN?

It secures loads during power loss or servo disable to reduce risks of back-driving ballscrews or belts. It allows faster e-stop deceleration settings while maintaining position without relying solely on motor torque.

What integration considerations follow from the 192 mm flange and 130 mm centering diameter on MHD112C-058-NP3-AN?

The 130 mm pilot registers concentricity for keeping radial runout low and easing shaft alignment. Its standardized 192 mm pattern simplifies retrofits onto Rexroth and ISO-pattern gearboxes and frames for reducing adapter plates and bearing preload error during assembly.

Common Misspellings

Internal Product Review

The Bosch Rexroth Indramat’s MHD112C-058-NP3-AN servo motor comes with a 70 Nm holding brake and a keyed shaft that enhances holding and torque transfer. It manages thermal stability through liquid-cooled housing. This motor possesses an HSF digital feedback encoder for accurate control to suit machine tools, printing, packaging and material handling.

1620 Old Apex Road
Cary, NC 27513, USA

Toll Free: 1-888-551-3082
International: 1-919-443-0207

Fax: 1-919-867-6204

[email protected]

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North Carolina Office

Indramat USA
1620 Old Apex Road
Cary, NC 27513
USA

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Toll Free: 1-888-551-3082
International: 1-919-443-0207

Indramat USA sells factory new and pre-owned surplus products and maintains channels to procure supply. Indramat USA is not affiliated with nor an authorized distributor or representative of any manufacturers, brands or products listed. Designated trademarks, brand names, and brands appearing herein are the property of their respective owners.