BERGER LAHR VRDM-39750 – Precision Hybrid Stepper Motor for Reliable Positioning

The BERGER LAHR VRDM-39750 is a mid-size, 2-phase hybrid stepper motor from the well-known Berger Lahr line (now part of Schneider Electric). It’s the kind of motor you pick when you need stable, repeatable motion in indexing tables, labeling lines, small gantries, or linear stages driven by lead screws. From my experience, this series is appreciated for its smooth microstepping behavior with Lexium SD drives, dependable holding torque for fixtures and clamps, and a robust build that stands up well in 24/7 machinery.

You might notice that variants in the VRDM family come with different options (encoder, brake, shaft style). The -50 suffix typically indicates a higher phase-current rating, pairing nicely with modern stepper drives where you want a bit more torque headroom. In many cases, it drops straight into existing mounts thanks to the square flange and standard shaft geometry used across the series.

Our Order Process and Guarantees

• Warranty: 365 days
• Lead time: 1 week if in stock; no more than 1 month at the latest
• Payment: 50% advance payment; full payment before delivery
• Express shipping: FedEx, UPS, DHL

Key Features

• Hybrid stepper design: 2-phase motor engineered for precise, incremental motion with dependable step accuracy.
• 1.8° step angle (typical): 200 full steps/rev; microstepping with Lexium SD drives delivers very smooth low-speed motion.
• Higher current variant: The “-50” designation typically corresponds to a 5.0 A/phase rating, supporting higher torque applications.
• Rugged construction: Industrial bearings and solid rotor/stator stack that hold up on continuous-duty machinery.
• Easy retrofit: Standard square-flange mounting and common shaft styles make replacement straightforward in many cases.
• Options by sub-variant: Models are often available with holding brake or encoder for closed-loop monitoring.
• Works with Schneider Electric Lexium SD3/SD2 drives: A proven pairing for packaging, printing, electronics assembly, and light automation axes.

Technical Specifications

Related or Supporting Products

• BERGER LAHR VRDM-3910 – Lower current variant, suitable for lighter loads and compact axes.
• BERGER LAHR VRDM-39756 – Similar frame with higher current/torque capability in many cases.
• BERGER LAHR VRDM-56450 – Larger frame size for applications needing substantially higher torque.
• Schneider Electric Lexium SD3 (Stepper Drive) – Wide current range, fine microstepping; a common match for VRDM motors.
• Schneider Electric Lexium SD2 (Stepper Drive) – Earlier-generation drive, still widely used in installed bases.
• Encoders / Holding Brakes (VRDM options) – Add position feedback or hold position when power is removed.

Installation & Maintenance

A good install typically comes down to proper mounting, clean wiring, and thermal awareness. Here’s a concise checklist we use on shop floors:

• Mounting: Bolt to a flat, rigid surface (cabinet or machine frame) to prevent misalignment; use anti-vibration washers if needed.
• Ventilation: Provide airflow around the motor body; avoid enclosing the motor without ventilation if running at higher currents.
• Wiring: Use shielded, twisted-pair motor cables; keep motor leads away from high-voltage lines; ensure correct phase pairing to the drive.
• Grounding: Bond motor frame to protective earth; ground the shield 360° at the drive side for best EMC behavior.
• Coupling: Align the shaft carefully; limit radial and axial loads to bearing capability; use flexible couplings for lead screws.
• Drive setup: Set phase current close to the motor’s rated value; enable microstepping; tune acceleration/jerk to avoid resonance bands.
• Routine maintenance: Check mounting screws, couplings, and belts quarterly; clean dust buildup; inspect connectors; review encoder alignment if fitted.
• Firmware & logs: If using Lexium SD drives, keep firmware current and save parameter backups for quick swaps.
• Safety: Lock out power before wiring; use guards on rotating parts; verify brake function (if equipped) during commissioning.

Quality & Certifications

• CE conformity (typical for Berger Lahr/Schneider Electric motion products)
• RoHS compliant
• Manufactured under ISO 9001 quality systems
• UL/CSA recognition may apply to specific sub-variants (confirm on nameplate)
• Warranty: 365 days