Camcon binary actuator

The binary actuator consists of an electromagnet that polarizes a rod resting in between 2 magnetic poles that are situated by one end of the rod. The charge on the rod then experiences attraction to one pole or another, causing the end of the rod to attach to one of the two poles of the magnetic circuit. When one end of the rod moves to one magnetic pole, the rod pivots on its midpoint and the other end of the rod moves in the opposite direction. This movement can be used to control a valve sealing or opening a passage.

This design is bistable meaning it will remain in either position until prompted to adopt its other stable state via the process as described above. The end of the rod will always remain in contact with one pole or the other, even when there is no current flowing through the system. Part of the force of attraction is stored in springs while the rod remains in either position to aid in accelerating the rod towards its other position when the magnetic flux is reversed. This conserves energy whenever the magnetic field switches, in turn using less energy to switch into either position. This makes the Binary actuator energy efficient

.The Binary actuator can be used to open and close a variety of ports controlling the pattern and flow as desired as illustrated The forces involved with the binary actuator are illustrated

The following formula can be used to compute forces and moments:

Fp= Φ2 P/4

Where Fp [ N] = pressure force,  Φ [mm] is orifice diameter, and P[ bar] is the pressure difference at inlet

Δ F= Fh-Fp

Where Fh [ N] is the holding force and Fp [ N] is the pressure force  

Fs= Fh/cos a

Where Fs [ N] is the spring force, Fh [ N] is the holding force, and a [deg] =Spring declination angle

Fr= Fh tan(a)

Where Fr [ N] is the rotating force, Fh [ N] is holding force and a [deg] .= Spring declination angle

Ms=Fr (r-K)cos c

Where Ms [Nm] is reversing momentum that is caused by spring force, Fr [ N] is the rotating force,K [mm] = the spring fitting offset, and c [deg] is the pivoting force projection angle

Mp=Δ F  Φ/2

Where Mp [Nm]-reversing momentum caused by pressure and Φ [mm] is the orifice diameter

Mr=Ms+Mp

Where Mr [Nm] = effective reversing momentum, Ms [Nm] is reversing momentum that is caused by spring force, and Mp [Nm]-reversing momentum caused by pressure and Φ [mm] is the orifice diameter

Mh=Fm L

Where Mh [Nm] is the holding momentum, Fm [N]=magnetic force, and L [mm] is the Swing bar’s effective length

And In order to maintain the valve in a closed state Fh must be greater than Fp.

[1]

The Camcon binary actuator was developed by Wladyslaw Wygnanski. The developmental principle of BAT was an internal energy recycling concept which was first applied to generate a fast responding pneumatic horn valve[2] with high energy efficiency for an air powered sound source loudspeaker. Subsequently Wygnanski developed a series of inventions in the patent class 251/65, “permanent or constantly energized magnet actuator”. By the late 1990’s he made a conscious decision to refocus the development of BAT and joined with Camcon in further development of the technology.[2]

While the technology was originally proposed for use in reducing noise in the aircraft industry, or to control liquid nitrogen flow in spacecraft from NASA, Camcon took the technology of the binary actuator as a means to control flow of fluid and gases in oil and gas industries, automotive industries, and more recently in healthcare.[2]

Another application is in robotics. The design of these systems while they still use the same principle (having 2 home states), are vastly different and are unrelated to the Camcon binary actuation technology. Binary robotics devices are capable of executing practical tasks, such as instrument placement for planetary exploration. Robotics are envisioned to use Binary actuators as they are smaller and less complex than conventional servos and better suited, for example, for legged locomotion through rough terrain.[5] One such extension of the binary actuator is the dielectric Elastomer actuation (DEA). The DEA is an application of binary actuation described  by Jean-Sebastien Plante and Steven Dubowsky.[6][7] One of their applications uses the binary principle of flipping between the two stable states but using a diamond shaped frame instead of a rocking rod. Elastic bands store energy similar to the springs of the BAT design.[8]

Another application of the principles used by BAT is in  Articulated Binary Elements[9] (ABEs), One such design consists of bi-stable mechanisms sandwiched by flexible beams. The actuators can be mounted surrounding a joint in a similar fashion to the muscles in the human elbow or knee.  Experimental prototype binary devices and elements have been designed and constructed. The Binary Robotic Articulated Intelligent Device[9][7] (BRAID) and a design of a six legged walking robot capable of walking in rough terrain are examples.

United Kingdom Patent GB2150789A:[10] Loudspeaker (Wladyslaw Wygnanski) in 1983

US Patent US6935373B2[11] Electro-magnetically operable device (Wladyslaw Wygnanski)

US Patent US8006952B2[12]  Low power actuator and valve-actuator combination (Wladyslaw Wygnanski)

US Patent  US20120293051A1[13]  Rotary Electromagnetic Actuator (Wladyslaw Wygnanski)

United Kingdom Patent GB2207812A,[14] Electromagnetic actuators  (Wladyslaw Wygnanski)

US Patent  20050189021[15] Electromagnetic fluid flow control valve (Wladyslaw Wygnanski)

US7252114[1]   Electromagnetic fluid flow control valve (Wladyslaw Wygnanski)

Articulated robot

Kinetic energy recovery system

Camcon Technology