Konda Reddy Chevva

US Patent:

20210237907, Aug 5, 2021

Filed:

Jan 25, 2021

Appl. No.:

17/157499

Inventors:

- Charlotte NC, US
Matthew R. Pearson - Hartford CT, US
Konda Reddy Chevva - Ellington CT, US

Assignee:

Goodrich Corporation - Charlotte NC

International Classification:

B64F 5/60
F16D 66/02
B60T 17/22
B64D 43/00

Abstract:

A method for estimating the brake wear of a brake installed in a vehicle is described herein, comprising acquiring an initial mass of said brake; quantifying the amount of energy that is being dissipated by the brake over a first time period, measuring a temperature increase of the brake over said first time period; estimating the brake mass based on the amount of dissipated energy and the temperature increase; and comparing said initial mass of said brake with said estimated brake mass and estimating the brake wear based on this comparison. The method for brake wear estimation may use indirect or direct methods for quantifying the amount of energy that is dissipated. A system for estimating brake wear and performing this method is also described.

US Patent:

20200259430, Aug 13, 2020

Filed:

Apr 30, 2020

Appl. No.:

16/862961

Inventors:

- Farmington CT, US
Shashank Krishnamurthy - Glastonbury CT, US
Konda Reddy Chevva - Ellington CT, US

International Classification:

H02P 3/26
H02P 3/14
B66B 1/32
H02P 3/04
H02P 3/22
H02P 3/02
H02P 6/24
H02P 3/16

Abstract:

A system includes a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, an inverter operatively connected to a motor and the DC bus, and a controller. The converter includes a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus. The inverter includes a second plurality of switching devices in selective communication with each phase of a plurality of phases of the motor and the DC bus. The controller is operable to command dropping of a brake through a passive delay circuit responsive to detection of an emergency stop condition for a load driven by the motor and reduce a voltage on the DC bus by dropping at least one phase of the AC power source and/or using a dynamic braking resistor prior to the brake physically dropping.

US Patent:

20190097551, Mar 28, 2019

Filed:

Sep 28, 2017

Appl. No.:

15/718607

Inventors:

- Farmington CT, US
Shashank Krishnamurthy - Glastonbury CT, US
Konda Reddy Chevva - Ellington CT, US

International Classification:

H02P 3/26
H02P 3/14
H02P 3/02
H02P 3/04
H02P 3/22
B66B 1/32

Abstract:

A system includes a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, an inverter operatively connected to a motor and the DC bus, and a controller. The converter includes a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus. The inverter includes a second plurality of switching devices in selective communication with each phase of the motor and the DC bus. The controller is operable to command dropping of a brake through a passive delay circuit responsive to an emergency stop condition for a load driven by the motor and reduce a voltage on the DC bus by dropping at least one phase of the AC power source and/or using a dynamic braking resistor prior to the brake physically dropping.

US Patent:

20180273343, Sep 27, 2018

Filed:

Mar 19, 2018

Appl. No.:

15/924687

Inventors:

- Farmington CT, US
Randy Roberts - Hebron CT, US
David Ginsberg - Granby CT, US
Ronnie E. Thebeau - Haddam CT, US
Konda Reddy Chevva - Ellington CT, US
XiaoBin Tang - Tianjin, CN

International Classification:

B66B 1/30
B66B 1/28
B66B 1/34
B66B 9/00
B66B 1/44
B66B 5/00
G05B 15/02

Abstract:

Methods and systems of controlling elevators including detecting a landing stop for an elevator car, measuring load information associated with the stop, controlling stopping of the elevator at the landing using a machine based on at least one of the detected landing and the measured load information and performing dynamic compensation control of a motion state of the elevator with a computing system and the elevator machine. The dynamic compensation control includes receiving motion state information related to at least one motion state of the elevator car at the computing system, receiving the landing and load information at the computing system, applying a filter to the received information and generating a first control signal, and producing a control output from the first control signal to control the elevator machine to minimize oscillations, vibrations, excessive position deflections, and/or bounce of the elevator car at the detected landing.

US Patent:

20170158461, Jun 8, 2017

Filed:

Dec 1, 2016

Appl. No.:

15/366577

Inventors:

- Farmington CT, US
David Ginsberg - Granby CT, US
Konda Reddy Chevva - Ellington CT, US
Walter Thomas Schmidt - Marlborough CT, US

International Classification:

B66B 1/30
B66B 11/04

Abstract:

An elevator system includes a lane and at least one rail extending along the lane. An elevator car is arranged in the lane and is operatively coupled to the at least one rail. The elevator car has a predetermined alignment relative to the at least one rail. A propulsion system is operatively connected between the elevator car and the at least one rail. A thrust and moment control system is operatively connected to the propulsion system. The thrust and moment control system selectively controls the propulsion system to substantially maintain the predetermined alignment of the elevator car relative to the at least one rail.

US Patent:

20170158462, Jun 8, 2017

Filed:

Dec 1, 2016

Appl. No.:

15/366648

Inventors:

- Farmington CT, US
David Ginsberg - Granby CT, US
Walter Thomas Schmidt - Marlborough CT, US
Konda Reddy Chevva - Ellington CT, US

International Classification:

B66B 1/30
B66B 11/04
B66B 5/00
B66B 9/00

Abstract:

A multi-car ropeless elevator system includes at least one lane. An elevator car is arranged in the at least one lane. A linear motor system includes a plurality of stationary motor primary sections extending along the at least one lane and at least one moveable motor secondary section mounted to the elevator car. A plurality of sensors is operatively connected to the linear motor system. Each of the plurality of sensors is operatively associated with a corresponding one of the plurality of stationary motor primary sections. A sensor failure detection and fusion system is operatively connected to each of the plurality of sensors. The sensor failure detection and fusion system operates to identify failures in one or more of the plurality of sensors and fuse data received from remaining ones of the plurality of sensors.

US Patent:

20170036887, Feb 9, 2017

Filed:

Jul 20, 2016

Appl. No.:

15/214648

Inventors:

- Farmington CT, US
David Ginsberg - Granby CT, US
Konda Reddy Chevva - Ellington CT, US
Walter Thomas Schmidt - Marlborough CT, US

International Classification:

B66B 1/30
B66B 11/04

Abstract:

According to an aspect, an elevator system includes a propulsion system having a plurality of motor segments forming a primary portion and a plurality of drives to impart force on a secondary portion coupled to an elevator car. The elevator system also includes a controller operable to identify a local neighborhood of the drives and determine a health status of each of the drives within the local neighborhood. The controller is further operable to adjust a thrust command per active drive of the local neighborhood based on at least one of the health status and a position of each active drive of the local neighborhood with respect to the secondary portion.