Li H Chen

6366049, Apr 2, 2002

May 10, 2000

09/567592

Li Chen - Livonia MI
Richard Joseph Hampo - Livonia MI
Yifan Zhao - Bellevile MI

Ecostar Electric Drive Systems L.L.C. - Dearborn MI

H02P 528

318799, 318432, 318433, 318434, 318727, 318609, 318610, 318800, 318801

A speed controller circuit for a motor including a ramp function generator having a first input connected to a source of a speed demand signal and a second input connected to a ramp step signal. The ramp function generator develops a frequency ramp that has a slope is initiated by the speed demand signal which is adjusted in response to the ramp step signal. The ramp function generator also provides a frequency signal wherein the ramp function increases or decreases the frequency according to the speed demand. A V/F circuit to the ramp function generator and a space vector modulation circuit are connected to the V/F circuit. The output of the space vector modulation circuit is applied through power switching devices to the motor for speed control. A PI controller circuit is connected to a motor current feedback signal and to a maximum current signal, which provides the current limit of the control system. The output signal from the PI controller circuit is a ramp step signal used to adjust the ramp signal of the ramp function generator to provide to provide the best performance of the motor control system and achieve a better starting time for the motor.

6377019, Apr 23, 2002

Feb 10, 2000

09/499366

Li Chen - Livonia MI

Ford Global Technologies, Inc. - Dearborn MI

H02P 7628

318807, 318803, 318805, 318808, 318809, 318798

An induction motor control system ( ) for electric vehicles having a DC power supply ( ), an inverter ( ), an induction motor ( ), a motor controller ( ) and a vehicle-level controller ( ). The method and system of the present invention optimizes the torque output for the induction motor and utilizes minimum power. The method and system of the present invention calculates the flux current such that the slip frequency is maintained at a nominal level, thereby producing peak torque.

6388419, May 14, 2002

Sep 1, 2000

09/653654

Li Chen - Livonia MI
Xingyi Xu - Canton MI
Richard Joseph Hampo - Livonia MI
Kerry Eden Grand - Chesterfield MI

Ford Global technologies, Inc. - Dearborn MI

H02P 124

318727, 318138, 318254, 318800, 318801, 318802, 318803, 318804, 318805, 318806, 318807, 318808

A motor control system for use within an electric vehicle having an induction motor Control system utilizes a torque control module a vector control module and a space vector PWM module to efficiently and accurately control the torque provided by motor.

6630809, Oct 7, 2003

Nov 29, 2001

09/683180

Li Chen - Livonia MI
Xingyi Xu - Canton MI
Vinod Reddy - Ocala FL
Richard Joseph Hampo - Plymouth MI
Kerry Eden Grand - Chesterfield MI

Ballard Power Systems Corporation - Dearborn MI

H02P 764

318804, 318800, 318801

Field oriented induction motor system including a field oriented induction motor having an associated torque current and an associated flux current and a predetermined current ratio, wherein the predetermined current ratio is defined as the ratio of the torque current to the flux current, and wherein the predetermined current ratio is dependent upon the saturation state of the motor. A method for selecting the ratio of torque current to flux current for a field oriented induction motor including applying an allocation factor to the torque current and flux current, wherein the allocation factor is dependent upon the saturation state of the motor. The saturation state of the motor is determined based upon motor parameters.

6707270, Mar 16, 2004

Nov 13, 2001

10/010307

Li Chen - Livonia MI
Kerry Eden Grand - Chesterfield MI
Richard Joseph Hampo - Plymouth MI
Vinod Reddy - Ocala FL
Xingyi Xu - Canton MI
Nick Langovsky - Inkster MI

Ballard Power Systems Corporation - Dearborn MI

H02P 736

318798, 318806, 318808

System and method for enhancing the torque output of a field oriented induction motor including a controller having a plurality of predetermined control parameters operable for processing input signals to generate output signals. The plurality of predetermined control parameters are dependent upon the nature of the input signals and the operational state of the motor. A sensor system is operable for communicating feedback signals related to the output signals and the operational state of the motor from the motor to the controller.

6815925, Nov 9, 2004

Nov 12, 2002

10/293911

Li Chen - Livonia MI
Xingyi Xu - Canton MI
Vinod Reddy - Ocala FL
Richard J. Hampo - Plymouth MI
Kerry E. Grand - Chesterfield MI

Ballard Power Systems Corporation - Dearborn MI

H02P 124

318727, 318767, 318772, 318798, 318804, 318801

Systems and methods for controlling and/or calculating the torque for a field oriented induction motor operating at a given stator frequency. The systems and methods include calculating the torque using a first algorithm when the motor is at or below a first predetermined stator frequency, a second algorithm when the motor is at or above a second predetermined stator frequency, and a third algorithm when the motor is between the first predetermined stator frequency and the second predetermined stator frequency.

6844701, Jan 18, 2005

Jan 15, 2003

10/345872

Li Chen - Livonia MI, US
Richard J. Hampo - Plymouth MI, US
Venkatapathi R. Nallapa - West Bloomfield MI, US

Ballard Power Systems Corporation - Dearborn MI

H02P 736
H02P 528
H02P 318
H02P 700

318825, 318822, 318806, 318432

Systems and methods for controlling an induction motor including detecting a field weakening operation state of the motor, wherein the field weakening operation state is detected when a flux current, I, in the motor is reduced to a predetermined fraction of its normal, non-voltage limited value. The systems and methods also including an overmodulation operation state of the motor before said field weakening operation state is detected and enabling the overmodulation operation state of the motor after said field weakening operation state is detected.

6936991, Aug 30, 2005

May 30, 2003

10/449824

Li Chen - Livonia MI, US
Roy I. Davis - Saline MI, US
Stephen Stella - Northville MI, US
Tod R. Tesch - Novi MI, US

Ballard Power Systems Corporation - Dearborn MI

H02P021/00

318700, 318254, 318138, 318439

A closed-loop permanent magnet motor control method and system optimally partitions torque and flux-weakening currents to produce a desired torque without exceeding the capability of the DC source. A maximum limit for allowable torque current and a minimum threshold for the maximum torque current are determined, and the flux current is varied based at least in part on whether the maximum torque current limit is above or below the minimum threshold while operating in a flux-weakening region to compensate for the variability of the DC source voltage.