公开(公告)号：US20190187668A1

公开(公告)日：2019-06-20

申请号：US15841575

申请日：2017-12-14

Applicant: Texas Instruments Incorporated

Inventor： Rajan Lakshmi Narasimha ,  David Patrick Magee

IPC: G05B19/416 ,  G05B19/29 ,  G05B19/39 ,  G05B19/414 ,  G02B26/00 ,  H02K29/10

CPC classification number: G05B19/416 ,  G02B26/008 ,  G05B19/291 ,  G05B19/39 ,  G05B19/414 ,  H02K29/10

Abstract: In described examples of methods and control systems to control a position and/or velocity of a machine, control circuitry is coupled to receive and dither a control signal, and to compute a control output value according to the dithered control signal and a control function. An inverter is coupled to the control circuitry, to control the position and/or velocity according to the control output value.

公开(公告)号：US10286785B2

公开(公告)日：2019-05-14

申请号：US15680261

申请日：2017-08-18

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aravind Samba Murthy ,  David Patrick Magee

IPC: B60L7/14 ,  B60L7/18 ,  B60L7/26 ,  B60L15/20 ,  B60L11/18

Abstract: A method of regenerative braking includes providing an electric motor including at least one stator and a rotor, a speed of the rotor, a motor controller that regulates a current level in the stator winding, a power inverter which controls an energy flow to the stator terminal, and an energy storage system (ESS) which exchanges energy with the motor. A battery management circuit is between the power inverter and the ESS, and a processor has an associated memory storing a regenerative braking (RB) algorithm. The RB algorithm during braking causes the motor controller to execute determining an RB torque value from the rotor speed that maximizes regenerative braking current, and the power inverter is used to redirect the RB current to maximize a power transfer from the motor to the ESS.

公开(公告)号：US20180188526A1

公开(公告)日：2018-07-05

申请号：US15395665

申请日：2016-12-30

Applicant: Texas Instruments Incorporated

Inventor： Yunhong Li ,  David Patrick Magee ,  Stephen John Fedigan

IPC: G02B27/00 ,  B08B7/02 ,  B60S1/56 ,  B60R11/04

CPC classification number: G02B27/0006 ,  B08B7/028 ,  B60R11/04 ,  B60S1/56

Abstract: A lens structure system with a lens structure and a multi-segmented transducer coupled to the lens structure. Each segment in the plurality of segments has a first conductor and a second conductor, wherein the first conductor and the second conductor are electrically coupled to the segment. The system also has circuitry for applying a voltage to selected segments in the plurality of segments with standing wave signals and traveling wave signals.

公开(公告)号：US20180154406A1

公开(公告)日：2018-06-07

申请号：US15583057

申请日：2017-05-01

Applicant: Texas Instruments Incorporated

Inventor： David Patrick Magee ,  Stephen John Fedigan

IPC: B08B7/02 ,  G02B27/00

CPC classification number: G02B27/0006 ,  G02B13/06 ,  G02B13/16

Abstract: Disclosed examples include lens cleaning systems, drivers and operating methods, including a transducer mechanically coupled to a lens, a driver to provide an oscillating drive signal to the transducer and a controller to control the drive signal frequency to vibrate the lens at frequencies in a range of interest. The controller determines a measured resonant frequency of the lens cleaning system in the range of interest according to a transducer feedback signal and selectively performs a lens cleaning operation if the measured resonant frequency differs from a baseline resonant frequency of the lens cleaning system for a clean lens.

公开(公告)号：US20180074025A1

公开(公告)日：2018-03-15

申请号：US15374802

申请日：2016-12-09

Applicant: Texas Instruments Incorporated

Inventor： Leonard William Estevez ,  David Patrick Magee ,  Amardeep Sathyanarayana

IPC: G01N29/46 ,  G01N29/07 ,  G01N29/24 ,  G01N29/44

CPC classification number: G01N29/46 ,  G01N29/075 ,  G01N29/11 ,  G01N29/4454 ,  G01N2291/012 ,  G01N2291/015 ,  G01N2291/044

Abstract: Mechanical vibration may be sensed by a remotely located ultrasonic sensor. An ultrasonic wave may be transmitted from a transmitter to a vibrating surface, in which the transmitter is separated from the vibrating surface by a distance. A reflected portion of the ultrasonic wave that is reflected from the vibrating surface may be received by a receiver that is also separated from the vibrating surface by a distance. A measure of phase shift amplitude in the reflected portion of the ultrasonic wave may be determined and converted into an amplitude of a vibration of the vibrating surface.

公开(公告)号：US20180031826A1

公开(公告)日：2018-02-01

申请号：US15225212

申请日：2016-08-01

Applicant: Texas Instruments Incorporated

Inventor： Stephen John Fedigan ,  David Patrick Magee ,  Yunhong Li

IPC: G02B27/00 ,  B08B7/02

CPC classification number: G02B27/0006 ,  B08B7/028 ,  G02B3/0075

Abstract: A lens structure system. The system comprises a lens structure and a multi-segmented transducer coupled to the lens structure. The multi-segmented transducer comprises a plurality of segments. For each segment in the plurality of segments, there also is a first conductor and a second conductor electrically coupled to the segment.

公开(公告)号：US09813005B2

公开(公告)日：2017-11-07

申请号：US15200294

申请日：2016-07-01

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： David Patrick Magee ,  Andre Veltman ,  Jorge Zambada

IPC: H02P21/14 ,  H02P21/24

CPC classification number: H02P21/14 ,  H02P21/24

Abstract: A method of controlling an electric motor (motor) includes providing a processor having an associated memory storing a stator resistance (Rs) estimation (RSE) algorithm that is programmed to implement the RSE algorithm to execute steps including injecting a current waveform at an arbitrary frame of reference into the stator using a field-oriented-control (FOC) motor controller including an Id controller and an Iq controller, and measuring current and voltage values from the motor responsive to the injecting. The measured current and voltage values are then transformed into transformed current and voltage values in a d/q coordinate system. The transformed current and voltage values are low pass filtered to generate filtered d/q current and voltage values, and a value for Rs is estimated from the filtered d/q current and voltage values. The arbitrary frame of reference can be a time-varying frame of reference.

公开(公告)号：US09783063B2

公开(公告)日：2017-10-10

申请号：US14837810

申请日：2015-08-27

Applicant: Texas Instruments Incorporated

Inventor： Aravind Samba Murthy ,  David Patrick Magee

IPC: B60L7/14 ,  B60L7/26 ,  B60L11/18

CPC classification number: B60L7/14 ,  B60L7/18 ,  B60L7/26 ,  B60L11/1803 ,  B60L15/2009 ,  B60L2220/12 ,  B60L2240/421 ,  B60L2240/423 ,  Y02T10/645 ,  Y02T10/646 ,  Y02T10/7005 ,  Y02T10/72 ,  Y02T10/7275

Abstract: A method of regenerative braking includes providing an electric motor including at least one stator and a rotor, a speed of the rotor, a motor controller that regulates a current level in the stator winding, a power inverter which controls an energy flow to the stator terminal, and an energy storage system (ESS) which exchanges energy with the motor. A battery management circuit is between the power inverter and the ESS, and a processor has an associated memory storing a regenerative braking (RB) algorithm. The RB algorithm during braking causes the motor controller to execute determining an RB torque value from the rotor speed that maximizes regenerative braking current, and the power inverter is used to redirect the RB current to maximize a power transfer from the motor to the ESS.

公开(公告)号：US09705437B2

公开(公告)日：2017-07-11

申请号：US14721716

申请日：2015-05-26

Applicant: Texas Instruments Incorporated

Inventor： Eric James Thomas ,  David Patrick Magee

IPC: H02P6/182

CPC classification number: H02P6/182

Abstract: A method of determining the angular position (θ) of a rotor of an N-phase permanent magnet motor (PMM) includes providing a processor having an associated memory, wherein the memory stores an angular position determination (APD) equation or hardware is included implementing the APD equation. The APD equation determines the angular position from N-phase measurements obtained from the stator windings associated with each of the N-phases. A voltage or a current is forced upon the stator terminals of the stator windings for each of the N-phases, a resulting stator current or stator voltage is sensed to provide the N-phase measurements responsive to the forcing of the voltage or current, and the APD equation is used to determine the angular position from the N-phase measurements.

公开(公告)号：US09705436B2

公开(公告)日：2017-07-11

申请号：US14960164

申请日：2015-12-04

Applicant: Texas Instruments Incorporated

Inventor： Stephen John Fedigan ,  Anuj Jain ,  David Patrick Magee

IPC: H02K29/08 ,  H02P6/16

CPC classification number: H02P6/16 ,  H02P21/06

Abstract: A motor control system for a permanent magnet synchronous motor (PMSM) uses two linear Hall devices to produce a first signal indicative of a strength of a first magnetic field component produced by a set of rotor magnets and to simultaneously produce a second signal indicative of a strength of second magnetic field component produced by the rotor magnets that is approximately orthogonal to the first magnetic field component. An angular position and angular velocity of the rotor is calculated based on the first signal and the second signal. A plurality of phase signals is produced based on the calculated angular position and angular velocity. Current in a plurality of field windings of the motor is controlled using the plurality of phase signals.