In this paper we apply recent developments in transpermanent magnetics to the problem of ultra-low-power valve control. Whereas the traditional approach to ultra-low-power valve control is based on latching mechanisms that turn off valves during inactive periods, in this paper we describe an approach that eliminates the need for latching mechanisms. Instead of latching mechanisms, the principles of transpermanent magnetics are employed to switch the states of permanent magnets; the use of permanent magnets instead of electromagnets eliminates power loads during inactive periods, thereby reducing power consumption to ultralow levels. The permanent magnets in a transpermanent magnet valve are configured in a stack. The relationships between the strength and number of permanent magnets in the stack and the stroke and resolution of the valve are developed. In this paper we show that the alternating uniform linear stack is well suited for digital process valves having a small number of states. Then in the paper we report on the design and testing of a laboratory prototype valve that uses an alternating uniform linear stack. The prototype valve had five states yielding a range of flow rates between 0 and 1.58ms with a resolution of 0.3ms. In this paper we find that transpermanent valves represent a promising valve technology for digital process valves.

1.
Sethson
,
K. M. R.
, 1993, “
Identifying the Dynamics of Fast Response Solenoid Valves
,”
The 3rd International Conference on Fluid Power
, Linkoping, 25–26 May pp.
271
287
.
2.
Becker
,
U.
, and
Schnieder
,
E.
, 1993 “
Different Mode of Operation of Pulse-Modulation with the Drive of 2∕2 Fast Switching Valves
,”
The 3rd Scandinavian International Conference of Fluid Power
, May 1993, Sweden, pp.
237
254
.
3.
Muramatsu
,
N.
, and
Tsutsumi
,
K.
, 2001, “
Measure to Reduce the Bounce of a Movable Part in an Electromagnetic Contactor
,”
ASME J. Mech. Des.
1050-0472
123
, pp
289
293
.
4.
Silverberg
,
L.
, and
Farmer
,
D.
, 2003, “
On Trans-Permanent Magnetic Actuation for Spacecraft Pointing, Shape Control, and Deployment
,”
J. Spacecr. Rockets
0022-4650, to appear.
5.
Farmer
,
D.
, 2003, “
Trans-Permanent Actuators and Motors
,” Ph.D. dissertation, Mechanical Engineering, North Carolina State University, Raleigh, NC, 27695-7910.
6.
Silverberg
,
L.
, and
Duval
,
L.
, 2003, “
Analysis of Trans-Permanent Magnetic Systems
,”
J. Dyn. Syst., Meas., Control
0022-0434,
125
, pp.
143
146
.
7.
Zycki
,
Z.
, and
Pawluk
,
K.
, 1998, “
Design of RLC Circuit for Pulse Magnetizer of Permanent Magnets
,”
Int. J. for Computation and Mathematics in Electrical and Electronic Engineering
,
17
, pp.
412
417
.
8.
BasicX-24 Microcontroller, NetMedia Inc., (www. basicx. comwww. basicx. com).
9.
L298 Dual Full-Bridge Driver Datasheet, STMicroelectronics (www.st.comwww.st.com).
10.
Duval
,
L.
, 2003, “
Low Power Valve Actuation Using Trans-Permanent Magnetics
,” Ph.D. dissertation, Mechanical Engineering, North Carolina State University, Raleigh, NC, 27695-7910.
11.
Spring Catalog 2002, Century Spring Corp. (www.centuryspring.comwww.centuryspring.com).
This content is only available via PDF.
You do not currently have access to this content.