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PHT Series Permanent-Magnet Brakes
SKU
pht-series
Torque Range: 0.0025–5.16 ft-lbs | Max RPM: 700–10000 | Shaft: 3–16 mm | Permanent-magnet brake (no power required)
Sample image only. Product may differ
Ogura’s PHT Series Permanent-Magnet Brakes are designed for ultra-compact applications requiring holding torque without continuous power input. These brakes use permanent magnets to generate braking force, eliminating the need for electrical power to maintain holding torque. This makes them suitable for systems where energy efficiency and fail-safe holding are required.
The PHT series supports high-speed operation in smaller torque ranges, with models capable of running up to 10,000 RPM. The compact construction allows integration into small motors, precision instruments, and space-constrained assemblies. Multiple shaft configurations, including D-shaft and set-screw mounting, provide flexibility for system integration.
Models and Dimensions
| Model No. | Ogura P/N | Static Torque (ft-lbs) | max RPM | Bore (inch) | Volts/Watts | Keyway | Wgt (lbs) |
|---|---|---|---|---|---|---|---|
| PHT-0.02S | 25293000 | 0.0025 | 10000 | 3mm shaft | 0/0 | D shaft | 0.13 |
| PHT-0.02D | 25384800 | 0.0025 | 3600 | 5mm shaft | 0/0 | D shaft | 0.11 |
| PHT-0.05S | 25297000 | 0.0052 | 10000 | 3mm shaft | 0/0 | D shaft | 0.19 |
| PHT-0.05D | 25388100 | 0.0052 | 3600 | 5mm shaft | 0/0 | D shaft | 0.12 |
| PHT-0.5S | 25297100 | 0.041 | 1800 | 6mm shaft | 0/0 | D shaft | 0.19 |
| PHT-0.5D | 25386400 | 0.041 | 3600 | 8mm shaft | 0/0 | D shaft | 0.32 |
| PHT-1.2D | 25295100 | 0.150 | 1800 | 6mm | 0/0 | Set screw | 0.66 |
| PHT-2.5D | 25297200 | 0.291 | 1800 | 6mm | 0/0 | Set screw | 1.25 |
| PHT-5D | 25297300 | 0.550 | 1800 | 8mm | 0/0 | 3x9.4mm | 1.85 |
| PHT-10D | 25297400 | 1.08 | 1800 | 15mm | 0/0 | 5x17.3mm | 3.52 |
| PHT-30D | 23621200 | 2.25 | 1000 | 16mm | 0/0 | 5x18.3mm | 7.93 |
| PHT-70D | 23622300 | 5.16 | 700 | 16mm | 0/0 | 5x18.3mm | 17.40 |
Key Design Features
- Permanent-magnet brake design requiring no holding power
- Fail-safe operation with torque applied when unpowered
- Compact size for small and precision systems
- High-speed capability up to 10,000 RPM
- Wide torque range from 0.0025 to 5.16 ft-lbs
- Multiple shaft interface options (D-shaft, set-screw)
- Suitable for continuous holding applications
- Designed for low inertia systems
Applications
- Precision instruments - Maintains position in sensitive measurement systems without power draw.
- Small motors and actuators - Provides holding torque in compact drive systems.
- Medical devices - Enables stable holding in low-power or battery-operated equipment.
- Laboratory automation - Supports controlled positioning in small-scale automation systems.
- Optical and positioning systems - Maintains alignment without continuous energy input.
