公开(公告)号：US20180304318A1

公开(公告)日：2018-10-25

申请号：US15492433

申请日：2017-04-20

Applicant: Texas Instruments Incorporated

Inventor： Daniel Lee Revier ,  Benjamin Stassen Cook ,  David Patrick Magee ,  Stephen John Fedigan

IPC: B08B7/02 ,  B60S1/56

Abstract: Methods and apparatus for surface wetting control are disclosed. In certain described examples, an apparatus can expel fluid from a droplet on a surface using a transducer mechanically coupled to the surface. A first area of the surface can have a first wettability for the fluid, and a second area of the surface can have a second wettability for the fluid. The first wettability of the first area of the surface can be greater than the second wettability of the second area of the surface. The first area and the second area can be arranged in a patterned arrangement.

公开(公告)号：US10071400B2

公开(公告)日：2018-09-11

申请号：US15186944

申请日：2016-06-20

Applicant: Texas Instruments Incorporated

Inventor： Yunhong Li ,  David P. Magee ,  Stephen John Fedigan

IPC: H01L41/09 ,  B08B7/02 ,  G02B27/00

CPC classification number: B08B7/028 ,  G02B27/0006

Abstract: Disclosed examples include ultrasonic lens cleaning systems and driver circuits to clean a lens using four or more transducer segments mechanically coupled to the lens, in which the driver circuit provides phase shifted oscillating signals to the transducer segments to generate a mechanical traveling wave rotating around the center axis of the lens to vibrate the lens for improved ultrasonic cleaning.

公开(公告)号：US20180085793A1

公开(公告)日：2018-03-29

申请号：US15492286

申请日：2017-04-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Stephen John Fedigan ,  David Patrick Magee

IPC: B08B7/02 ,  B60S1/56

Abstract: Methods and apparatus for using two stage ultrasonic lens cleaning for water removal are disclosed. An apparatus can expel fluid from a droplet on an optical surface using an ultrasonic transducer mechanically coupled to the optical surface and having first and second resonant frequency bands. A signal generator can generate a first signal including a first frequency to be coupled with the ultrasonic transducer mechanically coupled to the surface, and can generate a second signal including a second frequency to be coupled with the ultrasonic transducer mechanically coupled to the surface. Switching circuitry can activate the ultrasonic transducer at the first frequency to reduce the droplet from a first size to a second size, and to activate the ultrasonic transducer at the second frequency to reduce the droplet from the second size to a third size.

公开(公告)号：US20170272011A1

公开(公告)日：2017-09-21

申请号：US15615951

申请日：2017-06-07

Applicant: TEXAS INSTRUMENTS INCORPORATED

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

IPC: H02P6/16

CPC classification number: H02P6/16 ,  G01R33/072 ,  G01R33/077 ,  H02K29/08 ,  H02P21/06 ,  H02P25/03

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.

公开(公告)号：US20170163182A1

公开(公告)日：2017-06-08

申请号：US14960164

申请日：2015-12-04

Applicant: Texas Instruments Incorporated

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

IPC: 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.

公开(公告)号：US20170003348A1

公开(公告)日：2017-01-05

申请号：US14755069

申请日：2015-06-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Stephen John Fedigan

IPC: G01R31/34

CPC classification number: G01R31/346 ,  G01R31/343

Abstract: Motor winding fault detection circuits and methods to detect motor winding faults are disclosed. An example fault detection circuit includes a positive sequence voltage calculator to calculate a positive sequence voltage value for a three-phase motor; a positive sequence current calculator to calculate a positive sequence current value for the three-phase motor; an interpolator to calculate an expected negative sequence voltage value based on the positive sequence voltage value, the positive sequence current value, and measured characteristics of the three-phase motor; a negative sequence voltage calculator to calculate a measured negative sequence voltage value for the three-phase motor; and a fault detector to detect that a winding fault exists in the three-phase motor when a difference between the expected negative sequence voltage value and the measured negative sequence voltage value satisfies a threshold.

Abstract translation: 公开了用于检测电动机绕组故障的电动机绕组故障检测电路和方法。 示例性故障检测电路包括：正序电压计算器，用于计算三相电动机的正序电压值; 一个正序电流计算器，用于计算三相电机的正序电流值; 基于正序电压值，正序电流值和三相电动机的测量特性来计算预期负序电压值的内插器; 负序电压计算器，用于计算三相电动机的测量负序电压值; 以及故障检测器，用于当预期的负序电压值和测量的负序电压值之间的差值满足阈值时检测三相电动机中存在绕组故障。

公开(公告)号：US09413163B2

公开(公告)日：2016-08-09

申请号：US14309735

申请日：2014-06-19

Applicant: Texas Instruments Incorporated

Inventor： Stephen John Fedigan ,  Sandun Shivantha Kuruppu ,  Paul LeRoy Brohlin

IPC: H02P27/06 ,  H02H7/08 ,  G01R31/34 ,  G01R27/16

CPC classification number: H02P27/06 ,  G01R27/16 ,  G01R31/343 ,  H02H7/0822 ,  H02P6/185 ,  H02P29/0241

Abstract: A motor control circuit includes a processor configured to calculate a plurality of motor impedances from measurements of an excitation voltage on a power bus to a motor and measurements of a plurality of currents through the motor resulting from the excitation voltage, and the processor configured to calculate individual winding inductances in the motor, based on the measured motor impedances, and configured to determine whether there is an inter-turn winding fault based on the calculated individual winding inductances.

Abstract translation: 电动机控制电路包括处理器，其被配置为从电力总线上的激励电压到电动机的测量值以及由激励电压产生的通过电动机的多个电流的测量来计算多个电动机阻抗，并且处理器被配置为计算 基于所测量的电动机阻抗，并且被配置为基于所计算的各个绕组电感来确定是否存在匝间绕组故障。