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VRAD 506 Compact Actuator Frontside
VRAD 506 Compact Actuator Bottom
VRAD 506 Compact Actuator Bottom left
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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.
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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


  1. 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.
  2. Torque Factor depends on the shaft rotation angle.
  3. Magnetic spring stiffness depends on the shaft rotation angle and the model of the actuator.
  4. Since Magnetic Spring Stiffness depends on angle, Natural Frequency also has some minor dependence on angle. Natural frequency is thus specified for small angles.
  5. Coil resistance and inductance depend on whether coils are connected in series, in parallel, or used independently.
  6. It is not recommended to operate the actuator continuously with greater than 0.2 amps per coil without a heat sink.
  7. 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.
  8. The actuator should survive operation over 100°C, but it is not recommended to exceed 80°C on a repeated basis.
  9. Heat sink must be clamped around the actuator to meet the specification above.
  10. 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%.

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