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Product Description
In extreme vacuum environments, standard stepper motors often experience a decline in accuracy or even permanent damage due to material outgassing, lubrication failure, or heat buildup. The WHEATSTONE vacuum stepper motor series is specifically engineered for high-vacuum (HV) to ultra-high-vacuum (UHV) conditions. While retaining the inherent advantages of stepper motors—such as open-loop positioning without the need for an encoder, high holding torque, and excellent start-stop response—the series ensures long-term, stable operation in harsh environments through a comprehensive vacuum-optimized design.
Key Features and Advantages
Ultimate Vacuum Compatibility: The motor body is constructed from special metals with low outgassing rates, high-performance ceramics, and vacuum-grade polymer materials. Materials are rigorously selected to minimize hydrocarbon contamination, effectively protecting the vacuum chamber from particulate and molecular contamination. Suitable for applications requiring vacuum levels of 10⁻⁷ Pa and higher.
Reliable Motion Control: As an open-loop or optional closed-loop stepper system, this series of motors provides precise step angle control (standard: 1.8°/0.9°), featuring high holding torque and excellent low-frequency damping characteristics. It enables smooth microstepping without complex parameter tuning, making it particularly suitable for vibration-sensitive optical adjustments and precision positioning applications.
Innovative Thermal Management and Lubrication Technology: To address the challenge of convective cooling failure in vacuum environments, this series supports conductive cooling, radiative cooling, and an optional liquid cooling jacket design to effectively dissipate heat from the windings. At the same time, by eliminating traditional grease lubrication and adopting solid-state lubricating coatings or vacuum-resistant bearings,
the series fundamentally eliminates lubricant evaporation issues, significantly extending the motor’s service life across a wide temperature range from cryogenic temperatures (-196°C) to high temperatures (+200°C).
Flexible Customization Capabilities: Available in a variety of frame sizes ranging from 40 mm to 180 mm, the series allows for customization of winding parameters (current/inductance), shaft output configurations, and special flange interfaces according to user requirements, ensuring a perfect fit for precision drive units within semiconductor manufacturing equipment, vacuum robotic arms, space payload mechanisms, and particle accelerators.
Typical Applications
Semiconductor wafer transfer and vacuum locking mechanisms
Satellite solar panel drive and antenna pointing mechanisms
Sample stage and shutter control in ultra-high vacuum environments
Research-grade molecular pumps and valve actuators
Motor Dimensions
Electrical Parameters
| Step Angle（°） | 1.8 |
| Max Motor Length(mm) | 38(Optional 32） |
| Current(A) | 1.0 |
| Phase resistance(Ω） | 2.4 |
| Mutual Inductance(mH) | 3.5 |
| Holding Torque | 0.2 |
| Moment of Inertia | 20 |
| Weight(kg) | 0.3 |
35 Motor Torque-Frequency Characteristic Curve
Torque(NM)
Speed(RPM)
Technical Specifications
| Step Angle | 1.8° | Insulation Class | B | |
| Radial Clearance | 0.025mm | Dielectric Strength | 500VAC 50HZ 1mA 1Minute | |
| Axial Clearance | 0.075mm | Motor Overheating | 80℃Max(Rated Current, Atmospheric Pressure） | |
| Resistor Accuracy | ±5% | Ambient Temperature | Levels Available | |
| Electrical Accuracy | ±10% | Radial Load | 28/35 series | 10N Max |
| 42 series | 22N Max | |||
| Insulation Resistance | 100MΩ | Axial Load | 20 series | 2N Max |
| 28/35 series | 5N Max | |||
| 42 series | 10N Max | |||
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