Sew DFS56L/TF/RH1M/KK

Technical Specifications

• Motor frame size: 56L
• Gear unit type: DFS series coaxial helical gear reducer
• Rated motor power: 0.09kW to 0.37kW (depending on gear ratio)
• Output speed range: 10rpm to 300rpm (varies with gear ratio)
• Output torque: up to 25Nm

Functional Features

• TF thermal protection sensor embedded in the motor winding for overheat protection
• RH1M incremental encoder for precise speed and position feedback
• KK series holding brake for reliable load holding when power is off
• High-efficiency gear train with low backlash and long service life
• Maintenance-free design with lifetime lubrication

Application Scenarios

• Precision conveying and positioning systems
• Packaging machinery and labeling equipment
• Material handling and storage automation
• Small machine tool auxiliary drives

Performance Parameters

• Gear efficiency: up to 96% for single-stage reduction
• Backlash: less than 30 arcminutes (standard version)
• Brake holding torque: matched to motor output torque
• Operating ambient temperature: -20°C to +40°C

Material Composition

• Gear housing: high-strength cast iron
• Gears: alloy steel with carburizing and quenching treatment, ground tooth surface
• Motor housing: aluminum alloy for light weight and good heat dissipation
• Shaft: high-strength alloy steel with surface hardening

Structural Features

• Coaxial integrated structure with compact axial dimension
• Foot-mounted or flange-mounted installation options
• Integrated motor, gear unit, encoder and brake in one unit
• Standard IEC mounting dimensions for interchangeability

Working Principle The three-phase asynchronous motor converts electrical energy into rotational mechanical energy, and the speed is reduced and the torque is amplified through the multi-stage helical gear train inside the gear unit, then output through the output shaft. The encoder installed at the rear end of the motor feeds back the real-time speed and position signals to the drive controller for closed-loop control. The holding brake engages when power is cut off to lock the motor shaft and prevent the load from moving.

Installation Requirements

• Ensure the mounting base has sufficient rigidity to avoid vibration during operation
• Align the output shaft with the load shaft precisely to avoid radial and axial additional forces
• Use flexible couplings for shaft connection to compensate for alignment errors
• The motor must be reliably grounded, and the encoder cable must use shielded wire
• For vertical installation, confirm the lubrication configuration is suitable for vertical operation

Usage Precautions

• Do not apply impact load beyond the rated output torque to the output shaft
• Check the brake wear regularly and replace the brake lining when reaching the wear limit
• Do not disassemble the encoder to avoid damage to the optical components
• Replace the lubricating grease according to the specified maintenance cycle for long-term operation
• Ensure the motor cooling air duct is unobstructed to prevent overheating