8LSC55.ee045ff00-4 | B&R 18.1 Nm Servo Motor

High-Performance Synchronous Servo Motor

When precision motion control is critical, the 8LSC55.ee045ff00-4 from B&R delivers. This three-phase synchronous servo motor is engineered for applications requiring excellent dynamic characteristics, positioning accuracy, and a compact footprint. Its permanent-magnet, electronically commutated design ensures reliable, efficient operation in demanding industrial environments.

Key Performance Specifications

• Nominal torque: 18.1 Nm
• Nominal speed: 4,500 rpm
• Maximum torque: 60.0 Nm
• Maximum speed: 5,000 rpm
• Nominal power: 8,544 W
• Stall torque: 27.3 Nm
• Torque constant (KT): 1.09 Nm/A
• Voltage constant (KE): 65.97 V/1000 rpm
• Moment of inertia: 12.9 kg·cm²
• Mass (without brake): 1.00 kg

These specifications highlight the motor's ability to deliver high torque in a lightweight package. The high overload capacity (maximum torque of 60.0 Nm) supports rapid acceleration and deceleration cycles, improving machine throughput.

Built for Reliability and Long Service Life

The 8LSC55.ee045ff00-4 is designed with reliability in mind. Its externally fan-cooled design (IC4A0A6) maintains optimal operating temperatures, extending component life. The motor conforms to EN 60034-1 S1 continuous duty and features insulation class F (IEC 60085). Thermal protection via KTY83-110 or AM-PTC1000 sensors safeguards the winding, with a maximum winding temperature of 155°C.

With an IP64 protection rating (IP65 with optional oil seal), the motor resists dust and water ingress, making it suitable for harsh industrial environments. The water-based RAL 9005 coating provides additional corrosion resistance. Bearing life is calculated per DIN ISO 281, ensuring predictable maintenance intervals.

Versatile Feedback and Connectivity Options

This motor supports both resolver and EnDat feedback systems, including safety-related variants. The single-cable (hybrid) solution reduces wiring complexity and installation time. Built-in plug-in connectors simplify integration with B&R ACOPOS servo drives (recommended drive: 034X). The motor also features encoders for functional safety, enabling safe torque off (STO) when paired with compatible drives.

Easy Installation and Setup

Mounting flexibility is a key advantage. The 8LSC55.ee045ff00-4 supports multiple mounting orientations per EN 60034-7 (IM 3001, IM 3011, IM 3031). The flange conforms to DIN 42948 Form A, and the shaft end to DIN 748 Form E, ensuring compatibility with standard couplings and gearboxes. The keyway follows DIN 6885-1 Form A, and runout meets DIN 42955 tolerance R.

For installation, the motor operates within an ambient temperature range of -15°C to +40°C (up to +55°C with derating). It can be installed at elevations up to 2,000 meters without additional derating (up to 4,000 meters with specific connector options). Always follow the manufacturer's manual for proper wiring and mounting torque specifications.

Maintenance and Long-Term Performance

Routine maintenance is straightforward. Periodically inspect the cooling fan (24 VDC or 230 VAC) for dust accumulation and ensure unobstructed airflow. Check all electrical connections for tightness and signs of wear. The motor's sealed bearings require no lubrication, but verify bearing condition during scheduled maintenance per the manufacturer's recommendations.

The fan module is replaceable without disassembling the motor, minimizing downtime. For applications with high radial or axial loads, consider the optional reinforced A-side bearing (sizes 4-8) to extend service life. Always consult the official B&R documentation for detailed maintenance procedures.

Comparison with Similar Motors

Compared to other servo motors in its class, the 8LSC55.ee045ff00-4 stands out with its high torque-to-weight ratio. For example, while a typical 5 kW servo motor might weigh 8-10 kg, this motor delivers 8.5 kW at just 1.00 kg (without brake). This significant weight reduction simplifies machine design and reduces inertia, improving dynamic response.

Additionally, the motor's maximum torque of 60.0 Nm provides a 3.3x overload capability over its nominal torque, enabling it to handle peak loads without oversizing. This translates to cost savings in both motor and drive selection.

Frequently Asked Questions

What is the nominal torque of the 8LSC55.ee045ff00-4?

The nominal torque is 18.1 Nm, with a maximum torque of 60.0 Nm for peak loads.

What feedback options are available?

The motor supports resolver and EnDat feedback systems, including safety-related variants.

Is the motor suitable for high-speed applications?

Yes, the nominal speed is 4,500 rpm, and the maximum speed is 5,000 rpm.

What is the protection rating?

The motor is rated IP64 per EN 60034-5, with IP65 available with an optional oil seal.

What cooling method does the motor use?

It uses external fan cooling (IC4A0A6) with a machine-mounted independent fan component.

Availability and Support

The 8LSC55.ee045ff00-4 is available from Petro Auto Tech. Contact our team for current stock and lead times. We provide expert technical support to help you integrate this motor into your application.