Shutter Solenoid Actuation: Small Rotary Solenoids in Shutter Applications
Shutter Solenoid Actuation:
Small Rotary Solenoids in Shutter Applications
Geeplus offers several types of small rotary actuators/solenoids suited to actuation of small shutter mechanisms. These typically require rotation of a small ‘flag’ to block or pass a light beam, or of a small mirror to deflect a light beam down another path.
What Applications Does it Suit?
These rotary actuators are suited to small shutter mechanisms where the mass of moving elements is small, and is balanced about the axis of rotation. Fast actuation (<2ms) is possible for small angles and loads.
What Differentiates this from Other Solutions
The rotary devices are brushless, with a fixed coil and moving magnet rotor. So they do not exhibit the wear and reliability concerns associated with brushed motors. They can also endure high pulse currents without damage for high torque / fast operation.
Bistable operation allows the device to be driven from open to closed position, or vice versa, with a short excitation pulse. They can then hold this end position without power being applied.
>> This reduces power consumption in battery powered systems.
>> In applications such as thermal imaging, the reduction of heat dissipation from the actuator reduces disturbance of the sensors in the imaging system.
>> If ‘fail-safe’ operation is required where the device must return to a known state in the event of power failure, bistable operation may not be appropriate
By balancing the moving elements about the axis of rotation, the mechanism can be made highly resistant to shock applied in a linear direction. Friction can also be minimised with inexpensive bearings.
The most widely used actuators are moving magnet galvanometers or bistable rotary solenoids. A permanent magnet rotor is supported within a coil. When the coil is energised, the rotor tries to turn to align itself with the field developed by the coil, developing a torque proportional to the excitation current. An iron case helps concentrate the magnetic field, and reduces susceptibility to disturbance by external fields. By modifying the shape of this case, the device can be made bistable, so that it turns away from the centre position towards either end position without power applied. The bistable rotary solenoid is an extreme example of this where proportionality is sacrificed for better efficiency and bistable function.
Key Parameters (Size, Force, Power, etc.)
Devices are produced in sizes from 7mm diameter as standard, and up to 50mm diameter, smaller or larger sizes may be possible for high-volume applications.
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