Ted Tung Yang Lin

US Patent:

6597077, Jul 22, 2003

Filed:

Nov 29, 2001

Appl. No.:

09/998533

Inventors:

Ted T. Lin - Saratoga CA 95070
Ryan C. Lin - Saratoga CA 95070

International Classification:

H02K 3714

US Classification:

310 49R, 310180, 310184, 318696

Abstract:

A two-phase step motor with bifilar winding around the stator poles is connected to phases and (90Â apart) of a two-phase driver in a manner that maximizes torque at medium speed operation and minimizes vibrations. In particular, the coils that are wound around different groups of stator poles are connected in series. In one set, both coils are connected in a forward sense around the stator, while in the other set, the two coils are connected in opposite senses. All coils are energized in every phase of a pulse cycle. The properties are intermediate between that of convention series and parallel stator coil connections.

US Patent:

6969930, Nov 29, 2005

Filed:

Jul 28, 2004

Appl. No.:

10/902192

Inventors:

Ted T. Lin - Saratoga CA, US
Ryan C. Lin - Saratoga CA, US

International Classification:

H02K037/02
H02K037/14
H02P008/00

US Classification:

310 49R, 310180, 310184, 318696

Abstract:

A half-stepping motor with bifilar coil windings about its stator poles has two layers of stator coils with different numbers of turns per pole for each layer. The ratio between the number turns is selected to provide a desired angular phase shift in the torque profile. A first layer wound about a first group of poles is connected in series in a forward sense with a second layer wound about a second distinct group of poles and driven by a first phase, while a second layer wound about the first group of poles is connected in series in a reverse sense with a first layer wound about the second group of poles and driven by a second phase in quadrature relation to the first phase. For a motor with 8 stator poles, the desired phase shift is 22. 5 degrees, resulting from a turn ratio between the layers of about 0. 4142.

US Patent:

7459820, Dec 2, 2008

Filed:

May 24, 2006

Appl. No.:

11/440328

Inventors:

Ted T. Lin - Saratoga CA, US

International Classification:

H02K 49/00
H02P 15/00

US Classification:

310103

Abstract:

A belt and roller system comprising a roller having a permanent magnet sandwiched in between a pair of temporarily magnetic disks with the magnetism of the disks induced by the permanent magnet. For example, each temporarily magnetic disk may be steel. Each pole of the permanent magnet is disposed adjacent to a pole of one of the temporarily magnetic disks resulting in a magnetic attraction to a disk at each pole of the permanent magnet. The opposing magnetic poles of the disks form a magnetic flux circuit by which a temporarily magnetic belt, such as a steel belt is guidable to prevent or reduce deviation which it may have from its roller path. Additional permanent magnetic rollers, as described above, or other rollers known in the art may be combined with the magnetic roller of the present invention to form a gear train about which the belt rotates.

US Patent:

7518270, Apr 14, 2009

Filed:

Jun 22, 2006

Appl. No.:

11/425819

Inventors:

Richard L. Badgerow - Watsonville CA, US
Ted T. Lin - Saratoga CA, US

Assignee:

Lin Engineering, Inc. - Santa Clara CA

International Classification:

H02K 37/12

US Classification:

310 49R, 310216

Abstract:

A stepper motor includes a rotor having equally spaced rotor teeth defining a full step angle, and a stator with stator poles wound with coils that can be driven in a series of phases so as to magnetically interact with the rotor to produce stepping motion. The stator poles have teeth organized into two groups when there is an even number of stator teeth per pole, or into three groups for an odd number of stator teeth per pole. The stator teeth have an average pitch different from the rotor's tooth pitch, but the groups of stator teeth are also displaced relative to other groups by a specified offset angle of one-half or one-quarter step to double the number of detent positions, and to displace such detent positions from full one-phase ON or two-phase ON positions.

US Patent:

7586221, Sep 8, 2009

Filed:

Sep 27, 2006

Appl. No.:

11/535644

Inventors:

Ted T. Lin - Saratoga CA, US

International Classification:

H02K 37/14

US Classification:

310 49R, 310114

Abstract:

A hybrid step motor has axially spaced first and second sets of rotor sections (or alternatively different sets of stator sections) characterized by different tooth widths. The rotor/stator tooth width ratio in one set is optimized for one-phase ON operation while the rotor/stator tooth width ratio for the other set is optimized for two-phase ON operation. More generally, the two sets are optimized together for near sinusoidal, torque profile and substantially equal microsteps.

US Patent:

7622839, Nov 24, 2009

Filed:

Aug 27, 2008

Appl. No.:

12/199150

Inventors:

Ted T. Lin - Saratoga CA, US

International Classification:

H02K 49/00

US Classification:

310103

Abstract:

A belt and roller system comprising a roller having a permanent magnet sandwiched in between a pair of temporarily magnetic disks with the magnetism of the disks induced by the permanent magnet. Each temporarily magnetic disk may be steel. Each pole of the permanent magnet is disposed adjacent to a pole of one of the temporarily magnetic disks resulting in a magnetic attraction to a disk at each pole of the permanent magnet. The opposing magnetic poles of the disks form a magnetic flux circuit by which a temporarily magnetic belt, such as a steel belt is guidable to prevent or reduce deviation which it may have from its roller path. Additional permanent magnetic rollers or other rollers known in the art may be combined with the magnetic roller of the present invention to form a gear train about which the belt rotates.

US Patent:

8278803, Oct 2, 2012

Filed:

Aug 14, 2009

Appl. No.:

12/541723

Inventors:

Ted T. Lin - Saratoga CA, US
Richard L. Badgerow - Watsonville CA, US

Assignee:

Lin Engineering - Morgan Hill CA

International Classification:

H02K 37/04

US Classification:

310402, 310 89, 310411

Abstract:

A motor is provided with a set of end cap guides on the ends of a stator winding assembly to pilot the placement of end caps into the correct placement relative to the stator winding assembly so that the rotor assembly is maintained concentric with the stator. The end cap guides may be rings fitting within the winding insulators on the ends of the stator stack or may be integrated as guide segments with the winding insulators to outline an interrupted cylindrical inner surface coinciding with the inner diameter of the stator winding assembly. The guides allow proper positioning of the rotor assembly without increasing the stator stack length.

US Patent:

8283841, Oct 9, 2012

Filed:

Jun 23, 2010

Appl. No.:

12/821862

Inventors:

Ted T. Lin - Saratoga CA, US
Ryan C. Lin - Cupertino CA, US

Assignee:

Lin Engineering - Morgan Hill CA

International Classification:

H02K 7/08
H02K 5/00

US Classification:

310407, 310 90

Abstract:

A rotary machine (e. g. , motor or generator) has end caps with plastic piloting rings that engage a stator's plastic winding frame in an interference fit, so that a rotor seated by bearings in the end caps is properly aligned with the stator. The flexibility of the plastic-to-plastic fit allows looser tolerances in comparison to machining of all-metal end caps, while the average circle of the piloting ring's outer diameter still assures proper concentricity of rotor shaft, bearings, piloting rings and stator.