VRAD-506
VRAD-506
Price on request
Description
The VRAD-506 actuator is a very compact, galvanometer style, limited rotation Versatile Rotary Actuator Device featuring a magnetic spring return, wide-angle capability, and linear angle-versus-current profile. Suited for applications such as optical element positioning, fluid valve actuator, air damper/door actuator and optical beam chopper/shutter.
Features of the VRAD-506 Series
- The VRAD 506 actuator provides more than +/-25 mechanical degrees of rotation with only +/-5 volts applied to a single coil or to the series combination of coils.
- The high coil resistance allows for low power consumption, and access to two individual drive coils allows flexible single-supply unidirectional or bidirectional operation as well as dual-supply operation.
- In addition, each coil has a resistance of 26 ohms and an inductance of approximately 2.35 millihenry. The series combination of coils has only 52 ohms, yet nearly 3 times the inductance of a single coil, 6.6 millihenry at 1kHz.
- An internal rear shaft allows for use of an encoder or position sensor for closed loop operation.
Specifications
| Rotation Angle (1): | +\- 20 Degrees |
| Torque Constant (2): | 84000 Dyne*Centimeters per Ampere |
| Magnetic Spring Stiffness (3): | 280 Dyne*Centimeters per degree |
| Rotor Inertia: | 0.018 Gram*Centimeter2 |
| Natural Frequency(4): | 150Hz |
| Coil Resistance(5): | 52 Ohms (coils in series) |
| Coil Inductance(5): | 6.6mH at 1kHz (coils in series) |
| Maximum current(6): | 0.5 Amp per coil |
| Angle vs. Current Linearity: | 90% over +/-45 degrees peak-to-peak |
| Angle vs. Current Sensitivity(7): | 3.34mA per degree (coils in series) |
| Temperature coefficient of sensitivity: | +0.14% per °C |
| Angular position hysteresis: | +/- 1 Mechanical degrees maximum |
| Maximum internal temperature(8): | 80°C |
| Thermal resistance with heatsink(9): | 12°C per Watt |
| Thermal resistance without heatsink: | 48°C per Watt |
| DC Power at +/-20 degrees: | 0.25 Watts (3.6V series; 1.8V parallel) |
| DC Power at +/-40 degrees: | 1.2 Watts (8V series; 4V parallel) |
| DC Power at +/-50 degrees: | 2.8 Watts (12V series; 6V parallel) |
| Dielectric Strength: | 1000 VRMS |
| Life cycles(10): | 1010 Cycles |
| Mass: | 12.8 Grams |
NOTES
- There is no mechanical stop mechanism preventing further rotation, and the actuator may be used with angles well over +/- 45 mechanical degrees with some sacrifice in angle-versus-current linearity.
- Torque Factor depends on the shaft rotation angle.
- Magnetic spring stiffness depends on the shaft rotation angle and the model of the actuator.
- Since Magnetic Spring Stiffness depends on angle, Natural Frequency also has some minor dependence on angle. Natural frequency is thus specified for small angles.
- Coil resistance and inductance depend on whether coils are connected in series, in parallel, or used independently.
- It is not recommended to operate the actuator continuously with greater than 0.2 amps per coil without a heat sink.
- Angle vs. Current operation assumes that there is no static load and that the actuator is merely used to move a flag, mirror, or other element suspended from the actuator shaft.
- The actuator should survive operation over 100°C, but it is not recommended to exceed 80°C on a repeated basis.
- Heat sink must be clamped around the actuator to meet the specification above.
- Life cycles are only limited by bearing life. Bearings are high quality disk drive grade.
Specifications are at a temperature of 25° C. All mechanical and electrical specifications are +/-10%.
Downloads
Datasheet
