Charles K Hansen

US Patent:

45019819, Feb 26, 1985

Filed:

Oct 15, 1981

Appl. No.:

6/311754

Inventors:

Charles W. Hansen - Wolcott CT

Assignee:

Haydon Switch & Instrument, Inc. - Waterbury CT

International Classification:

H02K 3700

US Classification:

310 49R

Abstract:

A linear stepper motor is provided with a feature to cause it to return to a zero position when current is cut off. The motor is formed of a stator armature assembly and a permanent magnet rotor assembly with poles thereof facing poles of the stator armature. The rotor assembly includes a rotor core formed as a nut with an axial threaded aperture extending therethrough. A shaft assembly includes a shaft screw mating with the rotor core nut, a front shaft affixed thereto, and a fixed sleeve overfitting the front shaft to permit axial motion thereof. A ball-and-groove arrangement in the front shaft and the sleeve prevents rotation of the shaft without impairing axial movement thereof. A spring causes return of the shaft to zero when there is no current applied to the stator armature. The spring can, for example, be a coil compression spring overfitting a portion of the shaft or a spiral torsion spring extending between the rotor and the stator armature.

US Patent:

48843334, Dec 5, 1989

Filed:

Feb 21, 1989

Appl. No.:

7/312765

Inventors:

Roy Cooper - Waterbury CT
Charles Hansen - Wolcott CT

Assignee:

Tri-tech, Inc. - Waterbury CT

International Classification:

H02K 1502

US Classification:

29596

Abstract:

A multi-phase stepper motor having an annular permanent magnetic rotor and a plurality of matingly engageable stator phase assemblies around the rotor. Each of the phase assemblies comprises a pair of annular pole pieces including interleaved salient stator poles. The stator pole pieces in each pair are mated together in an opposed relationship to form an annular space between them to receive an energizing winding, and the winding for each pair is of a different phase. Depending upon the number of phase assemblies, the machine can operate in more than two phases. The diameter of the rotor is between about 55 percent and about 75 percent of the motor diameter, and approximately 40 percent more torque is produced than with equivalent sized conventional motors.

US Patent:

46550992, Apr 7, 1987

Filed:

Feb 26, 1985

Appl. No.:

6/705748

Inventors:

Charles W. Hansen - Wolcott CT

Assignee:

Tri-Tech, Incorporated - Waterbury CT

International Classification:

F16H 112
F16H 120

US Classification:

74421A

Abstract:

A mounting plate assembly has provisions for reducing the motor noise transmission from a DC stepper motor or the like that has an associated reducing gear assembly. The mounting plate assembly is formed of a front plate which provides the bushings for the shafts of the reducing gears and on which an output bearing is mounted for journalling an output shaft. A generally discoid inner mounting plate of a first diameter is affixed adjacent the front plate and serves as a mount for holding the retaining cup or the overall stepper motor and gear assembly. An outer mounting plate, which has a second diameter smaller than the first diameter, serves for mounting the overall assembly in place, and has an aperture, favorably provided with a sleeve, coaxial with the output bearing. In order to provide acoustic isolation, a layer of resilient rubber is vulcanized in place between the inner and outer mounting plates. A portion of the gasket fills the annulus between the output bearing and the sleeve.

US Patent:

48411892, Jun 20, 1989

Filed:

Dec 30, 1987

Appl. No.:

7/121170

Inventors:

Roy Cooper - Waterbury CT
Charles Hansen - Wolcott CT

Assignee:

Tri-tech, Inc. - Waterbury CT

International Classification:

H02K 3700

US Classification:

310257

Abstract:

A multi-phase stepper motor having an annular permanent magnetic rotor and a plurality of matingly engageable stator phase assemblies around the rotor. Each of the phase assemblies comprises a pair of annular pole pieces including interleaved salient stator poles. The stator pole pieces in each pair are mated together in an opposed relationship to form an annular space between them to receive an energizing winding, and the winding for each pair is of a different phase. Depending upon the number of phase assemblies, the machine can operate in more than two phases. The diameter of the rotor is between about 55 percent and about 75 percent of the motor diameter, and approximately 40 percent more torque is produced than with equivalent sized conventional motors.