PACIFIC SCIENTIFIC 33VM52-000-29

Core Technical Specifications (Motor + Encoder Combined)

Motor Parameters

• Frame Standard: NEMA 34 (86 mm square flange)
• Step Angle: 1.8° full step (200 steps per full rotation)
• Phase Configuration: Two-phase bipolar winding
• Rated Phase Current: 6.2 A RMS per phase
• Holding Torque: 12.8 N·m stationary holding torque
• Rotor Inertia: 0.0014 kg·m² low inertia rotor design
• Winding Resistance: 0.41 Ω per phase; Winding Inductance: 4.8 mH per phase
• Operating Temperature: -20 °C to +70 °C surface housing temperature
• Insulation Class: Class B (130 °C maximum winding temperature)

LDA-196-1000CE Encoder Parameters

• Encoder Type: Optical incremental quadrature encoder
• Line Count Resolution: 1000 lines per rotation
• Output Signals: A, /A, B, /B, Z, /Z differential line driver (RS422 standard)
• Power Supply for Encoder: 5 V DC ±5%, 120 mA max current draw
• Shaft Bore Diameter: Matching motor shaft diameter 14 mm press-fit mounting
• Encoder Housing Protection: IP50 dust-resistant rating

Functional Features

1. Closed-Loop Step Loss Elimination: LDA-196-1000CE encoder feeds real-time shaft position to compatible Pacific Scientific stepper drives to detect missed steps and automatically compensate positioning error
2. High Static Holding Torque: Optimized hybrid rotor magnetic circuit maintains rigid load positioning without continuous drive current hold mode
3. Low Vibration Winding Design: Skewed stator tooth structure reduces cogging torque and mechanical resonance at mid-range operating speeds
4. Differential Encoder Signal Output: RS422 differential wiring resists industrial electromagnetic interference for long-distance signal transmission up to 50 meters
5. Dual Connection Wiring Terminals: Separate terminal blocks for motor power windings and encoder signal cables to isolate high-current and low-signal circuits
6. Zero Index Pulse Alignment: Encoder Z-index pulse precisely aligned with motor electrical zero position for consistent equipment homing across multiple units

Material Composition

• Motor Stator Housing: Die-cast aluminum alloy black powder coated
• Rotor Core & Stator Lamination: Cold-rolled silicon steel laminated sheets with high permeability coating
• Rotor Permanent Magnet: Samarium-cobalt rare earth magnet for stable performance at elevated operating temperatures
• Motor Output Shaft: Alloy steel induction hardened, DIN standard flat keyway
• Encoder Housing: Glass-filled PBT engineering plastic with aluminum rear mounting flange
• Encoder Internal Optical Components: Infrared LED light source, silicon photodiode sensor array, glass code disk with precision etched grating lines

Structural Characteristics

• NEMA 34 standard 86 mm square front mounting flange with four 1/4-20 UNC threaded mounting holes
• Stacked coaxial structure sequence: Encoder rear housing → encoder code disk assembly → stepper motor rear end cap → stator winding core → rotor assembly → front output shaft bearing housing
• Double shielded ball bearing set at motor front and rear ends to support high radial and axial load capacity
• Separate cable exit ports: Side port for motor power cable, rear port for encoder signal cable
• Encoder unit factory pre-aligned and press-fitted to motor rear shaft to eliminate installation alignment deviation
• Axial through-hole design in encoder rear cover for manual shaft rotation access during machine commissioning

Working Principle

Stepper Motor Operating Principle

1. Two-phase bipolar drive pulses energize stator windings in sequential phase patterns to generate rotating electromagnetic magnetic fields
2. Rotor permanent magnet poles align sequentially with stator energized poles, producing discrete 1.8° rotational steps per full pulse cycle
3. Drive microstep subdivision (up to 256 microsteps per full step) interpolates intermediate positions for smooth low-speed rotation

LDA-196-1000CE Encoder Feedback Principle

1. 5 V DC supply energizes encoder internal infrared LED light source, projecting light through precision glass grating code disk
2. Photodiode sensor array converts light transmission variation into analog electrical signals, processed by internal circuit to generate differential quadrature A/B pulse trains
3. Z-index pulse triggers once per full shaft rotation to mark absolute rotational zero position
4. Encoder differential pulse signals transmit to stepper drive closed-loop controller; drive compares commanded step count vs actual encoder position count to correct lost steps dynamically

Application Scenarios

• CNC plasma cutting machine X/Y/Z linear positioning axes
• Automated woodworking machinery feed tables
• Heavy-load industrial 3D printing gantry systems
• Automated test equipment large travel linear stages
• Textile industrial warp knitting machine traverse mechanisms
• Automated storage rack vertical lift positioning drives

Installation Requirements

1. Mount motor flange fully seated to flat rigid metal base; mounting surface flatness error less than 0.1 mm
2. Limit radial shaft load to maximum 80 N at 20 mm distance from front bearing housing
3. Encoder signal cable must use shielded twisted-pair differential cable; shield grounded single-ended at drive controller cabinet only
4. Maintain minimum 25 mm air gap around motor housing for passive cooling; forced air cooling required for continuous operation above 5 A phase current
5. Flexible elastomer coupling mandatory for load connection to reduce bearing wear from shaft misalignment
6. Do not disassemble factory pre-fitted encoder unit; internal code disk misalignment will permanently damage position feedback accuracy

Operation & Maintenance Precautions

1. Avoid continuous operation above 600 RPM; high-speed operation accelerates bearing grease degradation
2. Replace motor bearing lithium grease every 4000 continuous operating hours
3. Encoder glass code disk is scratch-sensitive; avoid contact with sharp metal tools during wiring maintenance
4. If closed-loop position deviation alarm occurs, first verify encoder differential wiring polarity before adjusting drive control parameters
5. Do not expose encoder assembly to water splash or oil mist; condensation inside encoder housing short-circuits optical sensor circuits
6. Extended stationary holding operation (over 1 hour) should activate drive low-current hold mode to prevent motor overheating