Actuator using magnetic forces to reduce frictional forces

• US 5,842,680 A
• Filed: 09/11/1997
• Issued: 12/01/1998
• Est. Priority Date: 09/11/1997
• Status: Expired due to Fees

• Current Assignee: CTS Corporation
• Original Assignee: CTS Corporation
• Inventors: Adams, Phillip G., Leng, David Yan, Hoskin, Catherine, Bustamante, Eleazor Felipe
• Primary Examiner(s): Ferensic, Denise L.
• Assistant Examiner(s): BALL, JOHN WILLIAM
• Application Number:
  US08/927,330
• Time in Patent Office: 446 Days
• Field of Search: 291/160, 291/192, 291/158, 291/208, 291/129.11, 291/129.15, 291/129.01, 291/65
• US Class Current: 251/65
• CPC Class Codes: F16K 3/085 the axis of supply passage and the axis of discharge passage being coaxial and parallel to the axis of rotation of the plates
• CPC Class Codes: F16K 31/041 for rotating valves F16K31/055 takes precedence

Abstract

An actuator for opening and closing a valve with less resistance. The actuator includes a rotor, a stator, a valve and a shaft. The shaft having a first and second end, and an axis extending longitudinally therethrough. The stator, having an electromagnet mounted thereon, and circumferentially mounted around the shaft that extends therethrough. The rotor, fixedly mounted circumferentially around the first end, and having a permanent magnet mounted adjacent to the electromagnet and spaced a first distance therefrom. The valve including a rotary valve and valve seat. The rotary valve, mounted circumferentially around and near the second end, having a valve opening therein. The valve seat, mounted adjacent the rotary valve, having a seat valve opening therein, and fixedly attached to the stator. There actuator is designed for axially moving the rotor from the first distance to a second greater distance from the stator and thereby moving the rotary valve further away from the valve seat, and then axially rotate the shaft to a second position that aligned the seat valve opening and the valve opening, and then moving the rotor from the second distance back to the first lesser distance.

Claims

1. An actuator for opening and closing a valve, comprising:

a) a shaft having a first and second end, and an axis extending longitudinally therethrough;

b) a stator, having an electromagnet mounted thereon, and circumferentially mounted around the shaft that extends therethrough;

c) a rotor, fixedly mounted circumferentially around the first end, and having a permanent magnet mounted adjacent to the electromagnet and spaced a first distance therefrom;

d) a rotary valve, mounted circumferentially around and near the second end, having a valve opening therein;

e) a valve seat, mounted adjacent the rotary valve, having a seat valve opening therein, and fixedly attached to the stator;

f) the stator positioned intermediate the rotor and the rotary valve; and

g) means for axially moving the rotor from the first distance to a second greater distance from the stator and thereby moving the rotary valve further away from the valve seat, and then axially rotate the shaft to a second position that aligned the seat valve opening and the valve opening, and then moving the rotor from the second distance back to the first lesser distance.

2. A valve device that opens and closes a valve opening, comprising:

a) a fixed valve;

b) a movable valve that is positioned and designed to move from an open position to a closed position; and

c) electromagnetic actuator means, having a shaft extending through the electromagnetic actuator means and having the movable valve coupled to an end of the shaft, for electromagnetically actuating the movable valve, via the shaft, between the open and closed positions by first displacing the movable valve away from relative contact with the fixed valve, rotating the movable valve to either the open or closed position, and then displacing the movable valve into relative contact with the fixed valve.

3. The device according to claim 2, wherein the actuator means includes:

a) a stator, having an electromagnet mounted thereon, and circumferentially mounted around the shaft that extends therethrough;

b) a rotor, fixedly mounted circumferentially around the shaft, and having a permanent magnet mounted adjacent to the electromagnet and spaced a first distance therefrom, the stator mounted between the rotor and the movable valve.

4. The valve device according to claim 3, wherein the fixed valve is opposed to the movable valve, and is attached to the stator.

5. A valve device that opens and closes a valve opening, comprising:

a) a movable valve that is positioned and designed to move from a first position to a second position that will open and close the valve opening; and

b) an actuator that moves the movable valve between the open and closed positions including;

b1) a shaft having a first and second end, and an axis extending longitudinally therethrough, the second end coupled to the movable valve;

b2) a rotor, fixedly mounted circumferentially around the first end, and having a permanent magnet mounted adjacent to an electromagnet and spaced a first distance therefrom; and

b3) a stator, having the electromagnet mounted thereon, and circumferentially mounted around the shaft that extends therethrough, the stator mounted between the rotor and the movable valve.

6. The valve device according to claim 5, wherein a fixed valve is opposed the movable valve, the actuator first forcing the movable valve away from the fixed valve, moving the movable valve to either the open or closed position, and then forcing the movable valve toward the fixed valve.

7. The valve device of claim 5, wherein the actuator is a rotary actuator and the movable valve is a rotary movable valve.

8. The valve device of claim 5, wherein the movable valve is a rotary valve, mounted circumferentially around and near the second end, and has a valve opening therein.

9. The valve device of claim 6, wherein the fixed valve, mounted adjacent the rotary valve, has a valve opening therein, and fixedly attached to the stator.