Bhanuprasad V Gorti

US Patent:

7023159, Apr 4, 2006

Filed:

Aug 25, 2003

Appl. No.:

10/647807

Inventors:

Bhanuprasad V. Gorti - Abingdon MD, US
Hung T. Du - Reisterstown MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02P 7/00

US Classification:

318432, 318139, 318800

Abstract:

A method and apparatus for braking a motor has a braking power switching device coupled across windings of the motor. To brake the motor, the braking power switching device is cycled on and off.

US Patent:

7058291, Jun 6, 2006

Filed:

Jan 5, 2001

Appl. No.:

09/755330

Inventors:

J. Michael Weaver - Stewartstown PA, US
Aris C. Cleanthous - Baltimore MD, US
Christopher R. Yahnker - Eldersburg MD, US
Bhanuprasad V. Gorti - Abingdon MD, US
Richard T. Walter - Baldwin MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02P 6/00

US Classification:

388937, 318720, 318724

Abstract:

A system and method for reducing the cost of producing a brushless DC motor () is presented. The brushless DC motor () provides higher power density and efficiency with an increased tool run time. The brushless DC motor () includes a rotor assembly () that has an unmagnetized permanent magnet () affixed to a shaft. The permanent magnet () remains unmagnetized until the motor is partially assembled. A plurality of coils () for producing a magnetic field are wound about the rotor assembly (). The coils () include end turns that enclose the rotor assembly () such that the rotor assembly () is not removable. Since the windings () are wound with the rotor assembly () already enclosed, the windings () do not require large end coils to allow subsequent insertion of the rotor (). Minimizing the end coils reduces the length of wire required per turn, thereby reducing the resistance of the winding (). Also, since the permanent magnet () is unmagnetized when the coils () are wound around the rotor assembly () the winding process is simplified by not coupling energy into the wire which would influence the winder operation.

US Patent:

7075257, Jul 11, 2006

Filed:

Oct 22, 2004

Appl. No.:

10/972964

Inventors:

David A. Carrier - Aberdeen MD, US
Bhanuprasad V. Gorti - Abingdon MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02P 3/12

US Classification:

318375, 318376, 318466, 318470, 318467, 318468, 318469

Abstract:

A method and apparatus for braking a motor has a braking circuit that intermittently shorts the windings of the motor to brake the motor. The braking circuit is powered by back EMF generated by the motor when power is disconnected from the motor.

US Patent:

7270591, Sep 18, 2007

Filed:

Apr 12, 2005

Appl. No.:

11/103929

Inventors:

Uday S. Deshpande - Baltimore MD, US
Bhanuprasad V. Gorti - Abingdon MD, US
Shailesh P. Waikar - Cockeysville MD, US
William F. Hilsher - Parkville MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

B24B 49/00

US Classification:

451 5, 451357, 451359

Abstract:

A hand held orbital sander has a housing having an electronically commutated motor disposed therein and an orbit mechanism disposed beneath the housing. A motor controller is coupled to the motor. The motor controller changes the speed of at which it runs the motor from an idle speed to a sanding speed upon the motor speed dropping from idle speed to an idle speed threshold value and changes the speed at which it runs the motor from sanding speed to idle speed upon the motor speed increasing from sanding speed to a sanding speed threshold value. The sander may have a mechanical brake that brakes the orbit mechanism and the motor controller also dynamically brakes the motor.

US Patent:

7285877, Oct 23, 2007

Filed:

Mar 31, 2005

Appl. No.:

11/095728

Inventors:

Bhanuprasad V Gorti - Abingdon MD, US
William F. Hilsher - Parkville MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02H 11/00

US Classification:

307326

Abstract:

A driving tool, such as a fastening tool, with a driver, a motor, a flywheel driven by the motor, an actuator, an actuator member that is movable by the actuator, a trigger switch that is moveable by a trigger between an unactuated state and an actuated state, and a contact trip switch that is moveable by a contact trip between an unactuated state and an actuated state. The controller does not include power switches for controlling the operation of the motor and the actuator, but rather employs microswitches and control logic to determine when to activate the motor assembly and the actuator.

US Patent:

7318768, Jan 15, 2008

Filed:

Apr 12, 2005

Appl. No.:

11/103928

Inventors:

Uday S. Deshpande - Baltimore MD, US
Bhanuprasad V. Gorti - Abingdon MD, US
Jason R. Melvin - Baltimore MD, US
Gregory A. Rice - Aberdeen MD, US
David Wikle - York PA, US
Shailesh P. Waikar - Cockeysville MD, US
William F. Hilsher - Parkville MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

B49B 49/00
B51B 51/00
B24B 23/04

US Classification:

451 5, 451357, 451359

Abstract:

A power tool is a “low profile” power tool, that is the overall height of the power tool is sufficiently small that a user can grasp the top of the power tool with the user's hand and the hand will be positioned relative close to the bottom of the power tool compared with existing power tools. The low profile power tool uses a low profile motor having a diameter to lamination height ratio of at least 2:1. In an aspect of the invention, the motor is an electronically commutated “pancake” style motor. In an aspect of the invention, the power tool is a random orbital sander or an orbital sander having a motor that provides at least 40 watts of power. In an aspect of the invention, the sander has a mechanical brake that brakes the orbital mechanism and the motor is dynamically braked.

US Patent:

7371150, May 13, 2008

Filed:

May 11, 2007

Appl. No.:

11/747655

Inventors:

Uday S. Deshpande - Baltimore MD, US
Bhanuprasad V. Gorti - Abingdon MD, US
Shailesh P. Waikar - Cockeysville MD, US
William F. Hilsher - Parkville MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

B24B 49/00

US Classification:

451 5, 451357, 451359

Abstract:

A hand held orbital sander has a housing having an electronically commutated motor disposed therein and an orbit mechanism disposed beneath the housing. A motor controller is coupled to the motor. The motor controller changes the speed of at which it runs the motor from an idle speed to a sanding speed upon the motor speed dropping from idle speed to an idle speed threshold value and changes the speed at which it runs the motor from sanding speed to idle speed upon the motor speed increasing from sanding speed to a sanding speed threshold value. The sander may have a mechanical brake that brakes the orbit mechanism and the motor controller also dynamically brakes the motor.

US Patent:

7570011, Aug 4, 2009

Filed:

Apr 7, 2006

Appl. No.:

11/399948

Inventors:

Shailesh P. Waikar - Cockeysville MD, US
Bhanuprasad V. Gorti - Abingdon MD, US

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02J 7/14

US Classification:

320104, 320103, 320107, 320123

Abstract:

A charger including a power supply connectable to an outside power source, first and second battery power sources connected to the power supply for providing power to a battery pack, and a controller connected to the first and second battery power sources for controlling the first and second battery power sources. The first and second battery power sources are preferably connected in parallel to the battery.