Rexroth MHD115C-058-PG1-BA

Core Technical Specifications

• Frame Size: 115, Length Code C
• Continuous Standstill Torque: 70 Nm
• Integrated Holding Brake: Rated 70 Nm holding torque, 24 VDC brake voltage, 1.29 A brake current
• Brake Engagement Time: 53 ms; Brake Release Time: 97 ms
• Shaft Configuration: Plain solid shaft with standard shaft sealing ring
• Feedback Code PG1: Digital multi-turn absolute encoder, >4096 revolutions position memory
• Winding Code 058: High-torque low-speed winding design for heavy load driving
• Flange Centering Diameter: 180 mm, Flange Outer Size 192 mm
• Motor Overall Length: 522 mm, Shaft Extension Length 80 mm, Shaft Diameter 38 mm
• Protection Grade: IP65 full housing sealing
• Cooling Mode: Natural convection surface cooling
• Total Motor Weight: 55 kg
• Insulation Class: F (155°C winding temperature resistance)
• Operating Ambient Temperature: 0°C ~ +40°C
• Max Operating Speed: 6000 rpm
• Power Matching: Matched with Rexroth HDS/IndraDrive high-power servo drives (4kW ~ 11kW power range)

Function Features

1. Ultra-high continuous standstill torque, excellent low-speed heavy load operation performance without torque ripple
2. Built-in high-power holding brake, lock vertical axis load reliably when power cut off, no mechanical slipping
3. Multi-turn absolute encoder, machine retains full coordinate data after emergency stop without homing cycle
4. IP65 full sealing design, adapt to machine tool cutting fluid splash, dust and metal chip environment
5. High-strength rotor bearing structure, withstand large radial load from belt pulley and gear transmission
6. Temperature sensor embedded inside stator winding, real-time overheat protection linkage with servo drive
7. Side A power/encoder connector layout, convenient cable routing inside compact machine frame
8. DIN standard flange mounting, universal matching with Rexroth standard reducer series

Working Principle

Material & Structural Characteristics

• Motor Housing: Thick die-cast aluminum alloy with black anti-oil electrophoretic coating, external heat dissipation rib structure
• Stator & Rotor Core: High-grade low-loss silicon steel laminated sheet, reduce high-current eddy heat loss
• Rotor Permanent Magnet: High coercivity neodymium iron boron magnet, high temperature demagnetization resistance
• Shaft & Bearing: Medium carbon steel quenched solid shaft, double-row heavy load rolling bearings with high-temperature grease lubrication
• Shaft Seal: Double-layer nitrile rubber rotary seal ring, resist cutting fluid and metal dust penetration
• Brake Assembly: Dry friction disc brake with spring locking structure, 24VDC electromagnetic release coil
• Encoder Housing: Sealed aluminum alloy end cap, aviation multi-pin waterproof connector

Installation Requirements

1. DIN 42948 standard flange four-point mounting, fixing bolt tightening torque 35 Nm
2. Strictly control shaft coupling coaxiality error ≤0.03 mm to avoid bearing fatigue damage
3. Vertical installation recommended for lifting heavy loads; horizontal mounting allowed for horizontal transmission axes
4. Power and encoder cables adopt Rexroth original shielded servo cables, double-end shield grounding
5. Brake 24VDC power supply must independent from main drive power to avoid brake failure under load
6. Reserve ≥50 mm heat dissipation space around motor housing, avoid contact with machine tool metal wall
7. Install below 1000 m altitude; derate 15% torque when operating above 1000 m

Application Scenarios

• CNC machine tool heavy-duty spindle feed axis, gantry machine vertical lifting axis
• Large printing press paper unwinding/rewinding heavy tension drive axis
• Metallurgy steel coil winding, slitting machine heavy load servo drive
• Automated logistics large stacker crane vertical lifting servo
• Rubber & plastic extruder main screw drive axis
• Hydraulic press auxiliary heavy-duty positioning servo axis

Operation & Maintenance Notes

1. Test brake holding function under no-load condition before formal heavy load operation
2. Clean motor housing surface cutting fluid and metal chips every day to ensure heat dissipation efficiency
3. Replace bearing lubricating grease every 10,000 operating hours with Rexroth designated high-temperature grease
4. Do not disassemble encoder end cap privately, internal absolute position data will be lost after disassembly
5. Avoid long-term continuous operation at peak torque, only allow short-time acceleration overload
6. Prevent cutting fluid long-term soaking of motor connector; regularly check connector sealing rubber ring aging condition