Nitinkumar L Patel

US Patent:

8378605, Feb 19, 2013

Filed:

Jan 6, 2010

Appl. No.:

12/652931

Inventors:

Wei D. Wang - Troy MI, US
Nitinkumar R. Patel - Cypress CA, US
Yo Chan Son - Torrance CA, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

H02P 6/00

US Classification:

31840032, 31840001, 318721, 318799, 417 2, 417 441

Abstract:

A multiphase alternating current permanent magnet synchronous electric motor is coupled to an actuator. A sensorless electric motor drive control system controls operation of the electric motor. An initial phase angle and a rotational speed of a rotor of the electric motor are estimated. Operation of the sensorless electric motor drive control system and the electric motor are monitored using the estimated initial phase angle and the estimated rotational speed of the rotor of the electric motor. A fault in one of the sensorless electric motor drive control system and the electric motor is detected based upon the monitored operation.

US Patent:

8414270, Apr 9, 2013

Filed:

Nov 12, 2010

Appl. No.:

12/944800

Inventors:

Ali K. Naqvi - White Lake MI, US
Vincent Rawls - Farmington Hills MI, US
Nitinkumar R. Patel - Cypress CA, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

B62D 11/02

US Classification:

417 18, 180 648

Abstract:

A fluid system includes a fluidic device, an electrically-actuated fluid pump having a pump motor, and a control system. The control system controls a speed of the pump using a commanded torque value, and calculates a feedforward torque term as a function of a set of operating values, including a desired fluid line pressure. The control system determines the speed control torque term using pump speed error, and adds the feedforward torque term to the speed control torque term to calculate the commanded torque value. The speed control torque term may be determined using an integral term of a proportional integral derivative (PID) portion of the control system. A method for controlling pump speed includes calculating the feedforward torque term, determining the speed control torque term using a pump speed error, and adding the feedforward torque term to the speed control torque term to calculate the commanded torque value.

US Patent:

20200099323, Mar 26, 2020

Filed:

Sep 17, 2019

Appl. No.:

16/572764

Inventors:

Daniel R. Luedtke - Beverly Hills MI, US
Nitinkumar Patel - Oakland MI, US
Mustafa Mohamadian - Birmingham MI, US

International Classification:

H02P 21/20
H02P 6/18
H02P 21/18
H02P 21/22

Abstract:

A sensorless position estimation and control system and method for a permanent magnet electric motor of a powertrain system of a vehicle involve determining a reference torque to be achieved by the electric motor based on a set of vehicle operating parameters, determining a reference current magnitude to achieve the determined reference torque using a lookup table, determining current commands for the electric motor based on the determined reference current magnitude and a fixed reference current angle, injecting a high frequency voltage into a voltage control loop for the electric motor and estimating, by the controller, a position of a rotor of the electric motor thereafter, and controlling a current provided to the electric motor based on the determined current commands and the estimated rotor position.

US Patent:

20170229928, Aug 10, 2017

Filed:

May 4, 2016

Appl. No.:

15/145916

Inventors:

- Detroit MI, US
Peter J. Savagian - Bloomfield Hills MI, US
Khwaja M. Rahman - Troy MI, US
Nitinkumar R. Patel - Oakland MI, US
Robert T. Dawsey - Rochester Hills MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

H02K 1/02
H02K 19/02
H02K 1/24

Abstract:

A synchronous reluctance electric machine is described, and includes a stator including a plurality of electrical windings and a rotor disposed in a cylindrically-shaped void formed within the stator. The rotor includes a plurality of steel laminations assembled onto a shaft, wherein the shaft defines a longitudinal axis. Each of the steel laminations includes a plurality of poles and each of the poles includes a plurality of slots disposed near an outer periphery. The slots of the steel laminations are longitudinally aligned. A plurality of packets assembled from anisotropic material are disposed in the slots.

US Patent:

20170229934, Aug 10, 2017

Filed:

May 4, 2016

Appl. No.:

15/145926

Inventors:

- Detroit MI, US
Constantin C. Stancu - Auburn Hills MI, US
Peter J. Savagian - Bloomfield Hills MI, US
Nitinkumar R. Patel - Oakland MI, US
Robert T. Dawsey - Rochester Hills MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

H02K 1/27
H02K 21/14
H02K 1/02

Abstract:

An interior permanent magnet electric machine is described, and includes a stator including a plurality of electrical windings and a rotor disposed in a cylindrically-shaped void formed within the stator. The rotor includes a plurality of steel laminations assembled onto a shaft, wherein the shaft defines a longitudinal axis. Each of the steel laminations includes a plurality of poles and each of the poles includes a plurality of slots disposed near an outer periphery. The slots of the steel laminations are longitudinally aligned. A plurality of permanent magnets are disposed in a first subset of the slots, and plurality of packets assembled from anisotropic material are disposed in a second subset of the slots.