Email: sales@runshengdcs.com
WhatsApp / Wechat：+86 15383419322
Phone：+86 15383419322Description
The Pacific Scientific 33VM52-000-4 is a high-torque brushless DC servo motor engineered for precision motion control in demanding industrial automation applications. As part of Pacific Scientific’s (now Nidec) renowned VM Series, this frameless motor delivers exceptional power density through its innovative “pancake” design – featuring a large diameter (80 mm) and short stack length for optimal torque-to-inertia ratio. The 33VM52-000-4 generates continuous stall torque of 2.8 Nm (397 oz-in) with peak torque reaching 8.4 Nm, enabling rapid acceleration in high-cycle applications like robotics and CNC tool changers. Its slotless windings eliminate cogging for buttery-smooth motion at low speeds (<0.1 RPM), while high-energy neodymium magnets ensure consistent performance across -40°C to +155°C winding temperatures. Designed for direct integration into machinery, this frameless solution provides OEMs with unparalleled flexibility in mechanical packaging while eliminating coupling compliance for improved positioning accuracy.
33VM52-000-4 PACIFIC SCIENTIFIC
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | 33VM52-000-4 |
| Manufacturer | Pacific Scientific (Nidec) |
| Product Type | Brushless DC Servo Motor (Frameless) |
| Rotor Diameter | 80 mm (3.15″) |
| Stack Length | 12.7 mm (0.5″) |
| Continuous Torque | 2.8 Nm (397 oz-in) |
| Peak Torque | 8.4 Nm (1189 oz-in) |
| Torque Constant (Kt) | 0.55 Nm/A |
| Back-EMF Constant (Ke) | 57.5 V/krpm |
| Max Speed | 6000 RPM |
| Continuous Current | 5.1 A |
| Peak Current | 15.3 A |
| Resistance (Line-Line) | 1.45 Ω |
| Inductance | 3.2 mH |
| Thermal Resistance | 1.8 °C/W |
| Rotor Inertia | 0.00026 kg·m² |
| Weight | 0.68 kg (1.5 lbs) |
| Insulation Class | F (155°C) |
Main Features and Advantages
Ultra-High Power Density: The compact 33VM52-000-4 delivers 4.1 Nm/kg continuous torque – 30% higher than conventional servo motors – enabling smaller machinery footprints. Its frameless design reduces total installed length by eliminating couplings and bearings.
Precision Motion Control: Slotless windings achieve near-zero cogging (<0.5% torque ripple), critical for smooth velocity control below 1 RPM. High-resolution commutation (1.8° electrical resolution) supports micron-level positioning accuracy.
Thermal Management: Optimized magnetic circuit reduces iron losses, allowing 2.8 Nm continuous torque without forced cooling. Integrated thermistor (PTC/NTC options) provides real-time winding temperature monitoring.
Robust Construction: Military-grade epoxy encapsulation protects windings from chemicals and humidity. Hard-anodized rotor housing withstands 500g shock loads. Precisely balanced rotor (G2.5) minimizes vibration at high speeds.
Application Field
The Pacific Scientific 33VM52-000-4 excels in space-constrained, high-dynamics applications:
Semiconductor: Direct-drive wafer handling robots requiring micron repeatability
Aerospace: Electromechanical actuator control in flight surfaces
Medical: Surgical robot joint drives needing silent operation
Packaging: Rotary fillers/cappers with <5 ms index times
Defense: Stabilized camera gimbals for UAVs
3D Printing: Extruder wheel drives for precise filament control
33VM52-000-4 PACIFIC SCIENTIFIC
Related Products
PS 33VM40-000-4: Smaller diameter (64 mm) variant for lower torque requirements
PS 33VM52-000-6: Higher torque version (4.2 Nm continuous)
PS R32SSD-E: Compatible servo drive for 33VM52-000-4
PS 9000-HS: High-resolution resolver feedback option
PS 30H-5: Hollow-shaft planetary gearbox for torque multiplication
PS 33VM52-BK: Brake kit for vertical axis applications
PS 33VMCBL-10: Custom cable assembly with IP67 connectors
PS 33VMHSK-25: Heat sink kit for continuous operation >50°C ambient
