Michael Kinard Grove

US Patent:

20220385143, Dec 1, 2022

Filed:

Aug 10, 2022

Appl. No.:

17/885333

Inventors:

- New Britain CT, US
Joshua M. LEWIS - Baltimore MD, US
Marcell E. COATES - Baltimore MD, US
Michael D. GROVE - Windsor PA, US
Victor A. DORADO - White Marsh MD, US

International Classification:

H02K 11/215
B25F 5/00
H02K 9/22
H02K 11/33
B25F 5/02
H02K 5/08
H02K 5/22
H02K 7/14
H05K 1/02
H05K 1/11
H05K 1/18
H05K 5/00
H05K 7/20
H05K 3/28
H05K 5/02
H05K 5/06
H05K 7/14

Abstract:

A power tool including an electric motor is provided. The tool includes a substantially disc-shaped printed circuit board (PCB), power switches mounted on the PCB; magnetic sensors mounted on the PCB facing the motor; a heat sink in thermal communication with the power switches disposed between the PCB and the electric motor; and a molded casing structurally securing the heat sink relative to the PCB. The molded casing includes a center opening, at least one first opening provided at a first radial distance from the center opening arranged to receive the magnetic sensors therein, and at least one second opening provided at a second radial distance from the center opening arranged to securely receive the heat sink therein.

US Patent:

20220200368, Jun 23, 2022

Filed:

Dec 14, 2021

Appl. No.:

17/550315

Inventors:

- New Britain CT, US
Colin M. CROSBY - Baltimore MD, US
Nicholas J. LOWE - Lutherville-Timonium MD, US
James R. CLARKE - York PA, US
Daniel HECK - Toms River NJ, US
Michael P. SIKORA - Baltimore MD, US
Christian B. ROGERSON - Towson MD, US
Ryan F. SCHROEDER - Hampstead MD, US
Connor T. MOHAN - Fallston MD, US
Michael D. GROVE - Windsor PA, US

International Classification:

H02K 1/16
H02K 7/14
H02K 11/33
H02K 3/28

Abstract:

A brushless direct-current (BLDC) motor for a power tool includes a rotor assembly and a stator assembly including a stator comprising a stator core and stator teeth radially extending from the stator core and defining slots therebetween, and stator windings wound on the stator teeth. The stator has an inner diameter defined by inner ends of the stator teeth and an outer diameter defined by an outer surface of the stator core. A ratio of the inner diameter to the outer diameter is in the range of 0.5 to 0.53. The stator core has a variable thickness and, for each slot, includes a first portion forming an approximately right angle with the respective stator tooth and a second portion that is substantially normal to a radius of the stator assembly and forms an angle of approximately 25 to 35 degrees with the first portion.

US Patent:

20220200388, Jun 23, 2022

Filed:

Dec 14, 2021

Appl. No.:

17/550341

Inventors:

- New Britain CT, US
Colin M. CROSBY - Baltimore MD, US
Nicholas J. LOWE - Lutherville-Timonium MD, US
James R. CLARKE - York PA, US
Daniel HECK - Toms River NJ, US
Michael P. SIKORA - Baltimore MD, US
Christian B. ROGERSON - Towson MD, US
Ryan F. SCHROEDER - Hampstead MD, US
Connor T. MOHAN - Fallston MD, US
Michael D. GROVE - Windsor PA, US

International Classification:

H02K 3/52
H02K 7/14
H02K 21/16

Abstract:

A brushless direct-current (BLDC) motor for a power tool includes a rotor assembly; a stator assembly including a stator having stator teeth forming slots therebetween and stator windings wound around the stator teeth; stator terminals extending substantially parallel to the longitudinal axis from the stator assembly and being substantially aligned with centerlines of the slots of the stator assembly; and a circuit board mounted on the stator terminals adjacent the stator assembly. The circuit board includes conductive traces facilitating a one of a delta or a series connection between the stator windings. An end insulator is provided at an axial end of the stator to electrically insulate the stator from the stator windings, the end insulator including support members to support the stator terminals relative to the stator assembly. The circuit board is mounted and fastened to the support members.

US Patent:

20220200401, Jun 23, 2022

Filed:

Dec 14, 2021

Appl. No.:

17/550307

Inventors:

- New Britain CT, US
Colin M. CROSBY - Baltimore MD, US
Nicholas J. LOWE - Lutherville-Timonium MD, US
James R. CLARKE - York PA, US
Daniel HECK - Toms River NJ, US
Michael P. SIKORA - Baltimore MD, US
Christian B. ROGERSON - Towson MD, US
Ryan F. SCHROEDER - Hampstead MD, US
Connor T. MOHAN - Fallston MD, US
Michael D. GROVE - Windsor PA, US

International Classification:

H02K 7/14
H02K 1/276
H02K 1/16
H02K 9/06

Abstract:

A brushless direct-current (BLDC) motor for a power tool includes a motor housing having a radial wall, a rotor, a stator assembly including stator windings, and stator terminals extending substantially parallel to the longitudinal axis from the stator assembly. The stator terminals are substantially aligned with centerlines of slots of the stator assembly. A circuit board is mounted on the stator terminals adjacent the stator assembly. The circuit board includes conductive traces facilitating a one of a delta or a series connection between the stator windings. The circuit board may be mounted inside the motor housing in contact with the radial member. A second circuit board may be provided with power switches for driving the motor proximate the circuit board.

US Patent:

20220200414, Jun 23, 2022

Filed:

Dec 14, 2021

Appl. No.:

17/550323

Inventors:

- New Britain CT, US
Colin M. CROSBY - Baltimore MD, US
Nicholas J. LOWE - Lutherville-Timonium MD, US
James R. CLARKE - York PA, US
Daniel HECK - Toms River NJ, US
Michael P. SIKORA - Baltimore MD, US
Christian B. ROGERSON - Towson MD, US
Ryan F. SCHROEDER - Hampstead MD, US
Connor T. MOHAN - Fallston MD, US
Michael D. GROVE - Windsor PA, US

International Classification:

H02K 11/33
H02K 11/215
H02K 1/16
H02K 3/28
H02K 7/14

Abstract:

A brushless direct-current (BLDC) motor for a power tool includes a rotor assembly and a stator assembly including stator windings. A ratio of a motor size (Km) constant of the motor to an electrical envelope of the motor including electrical parts of the motor is greater than approximately 900 (Nm/√W)/m{circumflex over ( )}3. A ratio of a motor size (Km) constant of the motor to a magnetic envelope of the motor including stator core and windings is greater than approximately 810 (Nm/√W)/m{circumflex over ( )}3.

US Patent:

20220200426, Jun 23, 2022

Filed:

Dec 14, 2021

Appl. No.:

17/550289

Inventors:

- New Britain CT, US
Colin M. CROSBY - Baltimore MD, US
Nicholas J. LOWE - Lutherville-Timonium MD, US
James R. CLARKE - York PA, US
Daniel HECK - Toms River NJ, US
Michael P. SIKORA - Baltimore MD, US
Christian B. ROGERSON - Towson MD, US
Ryan F. SCHROEDER - Hampstead MD, US
Connor T. MOHAN - Fallston MD, US
Michael D. GROVE - Windsor PA, US

International Classification:

H02K 21/12
H02K 1/28
H02K 5/16
H02K 1/27
H02K 7/14
H02K 3/46

Abstract:

A brushless direct-current (BLDC) motor includes a stator assembly and a rotor assembly including a rotor supporting permanent magnets rotatable relative to the stator assembly. The stator assembly includes a stator comprising a stator core and stator teeth radially extending from the stator core and defining slots therebetween. A first set of stator windings is wound on the stator teeth, and a second set of stator windings is also wound on the stator teeth such that, on each stator tooth, the first and second windings are provided in an electrically parallel configuration.

US Patent:

20210342350, Nov 4, 2021

Filed:

Jul 14, 2021

Appl. No.:

17/375624

Inventors:

- Arlington VA, US
Michael Howard GROVE - Ellicott City MD, US
Kendall Grant CLARK - Great Falls VA, US
Pavel KLINOV - Heidelberg, DE

Assignee:

Stardog Union - Arlington VA

International Classification:

G06F 16/2453
G06N 5/02
G06N 20/00
G06F 16/901
G06F 16/2458

Abstract:

In certain embodiments, resource usage in a data retrieval process may be reduced. In some embodiments, a graph query related to a data request may be obtained. The graph query may be transformed into a query set based on a graph data model and patterns of the graph query. Upon generation, the query set may include queries and query operators linking the queries, where the query operators include a first query operator linking first and second queries of the queries or other query operators. Prior to execution of the first and second queries, a satisfiability issue may be predicted, where the satisfiability issue is related to combining results derived from the first and second queries. Based on the prediction, the first query operator may be removed from the query set to update the query set. The updated query set may be executed to satisfy the graph query.

US Patent:

20210091639, Mar 25, 2021

Filed:

Nov 18, 2020

Appl. No.:

16/951303

Inventors:

- New Britain CT, US
Joshua M. LEWIS - Baltimore MD, US
Marcell E. COATES - Baltimore MD, US
Michael D. GROVE - Windsor PA, US
Victor A. DORADO - White Marsh MD, US

International Classification:

H02K 9/22
B25F 5/00
H02K 11/215
H02K 11/33
B25F 5/02
H02K 5/08
H02K 5/22
H02K 7/14
H05K 1/02
H05K 1/11
H05K 1/18
H05K 5/00
H05K 7/20
H05K 3/28
H05K 5/02
H05K 5/06
H05K 7/14

Abstract:

An electronic module is provided for a power tool having an electric motor. The module includes a module housing having a radial portion and a cylindrical portion extending from the radial portion away from the electric motor and defining an open end, a printed circuit board (PCB) received within the module housing through the open end thereof, power switches mounted on the PCB, and magnetic sensors mounted on the PCB facing the motor substantially equidistantly from a center of the PCB. The module housing includes openings disposed in the radial portion angularly around a center of the module housing to receive the magnetic sensors therein to allow the magnetic sensors to magnetically interface with the electric motor.