公开(公告)号：US20230006575A1

公开(公告)日：2023-01-05

申请号：US17363646

申请日：2021-06-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Prasad Kulkarni ,  Sameer Pradeep Kulkarni ,  Venkata Pavan Mahankali

IPC: H02P6/18

Abstract: A method for determining a position of a rotor of a brushless direct current (BLDC) motor at standstill. The method includes providing a plurality of current pulses to a plurality of windings of the BLDC motor while the rotor of the BLDC motor is at a standstill position. The method further includes measuring a plurality of times that it takes for the plurality of current pulses to reach a threshold for respective ones of the plurality of windings. A first position corresponding to a shortest time of the plurality of times is determined. A position detection value is determined based on the shortest time and based on times corresponding to positions that are adjacent to the first position. A position of the rotor at the standstill position is determined based on the position detection value and an interpolation function.

公开(公告)号：US11476783B1

公开(公告)日：2022-10-18

申请号：US17359158

申请日：2021-06-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Venkata Pavan Mahankali ,  Prasad Kulkarni ,  Ganapathi Hegde

IPC: H02P6/21

Abstract: Example systems and processes control transition of an electric motor from open-loop operation to closed-loop operation by detecting zero-crossing (ZC) locations of the back-electromotive force (BEMF). The rotor angle of the electric motor is changed, e.g., by changing acceleration of the electric motor to correct a phase difference based on the detected ZC locations and an open-loop profile of the electric motor. Detected ZC locations may be used to identify ZC-detected-based commutation points, and each detected ZC location may be used to update a next commutation point. During the control process the open-loop profile is updated. Transition may occur when a set number of ZC-detection-based commutation points are sufficiently aligned with corresponding updated commutation points, or such alignment is maintained for at least one electrical cycle.

公开(公告)号：US12081158B2

公开(公告)日：2024-09-03

申请号：US17363646

申请日：2021-06-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Prasad Kulkarni ,  Sameer Pradeep Kulkarni ,  Venkata Pavan Mahankali

IPC: H02P6/18

CPC classification number: H02P6/181 ,  H02P2203/03

Abstract: A method for determining a position of a rotor of a brushless direct current (BLDC) motor at standstill. The method includes providing a plurality of current pulses to a plurality of windings of the BLDC motor while the rotor of the BLDC motor is at a standstill position. The method further includes measuring a plurality of times that it takes for the plurality of current pulses to reach a threshold for respective ones of the plurality of windings. A first position corresponding to a shortest time of the plurality of times is determined. A position detection value is determined based on the shortest time and based on times corresponding to positions that are adjacent to the first position. A position of the rotor at the standstill position is determined based on the position detection value and an interpolation function.

公开(公告)号：US11876471B2

公开(公告)日：2024-01-16

申请号：US17358147

申请日：2021-06-25

Applicant: Texas Instruments Incorporated

Inventor： Prasad Kulkarni

IPC: H02P27/16 ,  H02P27/14 ,  H02M1/12

CPC classification number: H02P27/16 ,  H02M1/126 ,  H02P27/14

Abstract: A motor controller integrated circuit (IC) includes a storage device containing software. The IC also includes a processor core coupled to the storage device. The processor core has an output adapted to be coupled to a motor. The processor core is configured to execute the software to implement a resonant controller at a frequency that is a harmonic of a speed of a motor.

公开(公告)号：US20230353072A1

公开(公告)日：2023-11-02

申请号：US17731389

申请日：2022-04-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Venkata Pavan Mahankali ,  Prasad Kulkarni ,  Ganapathi Hegde ,  Sameer Kulkarni

IPC: H02P6/21 ,  H02P6/18

CPC classification number: H02P6/21 ,  H02P6/186

Abstract: Example systems and processes use three-phase vector mutual inductance analysis to detect zero-crossing (ZC) locations of back-electromotive force (BEMF) of an electric motor and to detect its commutation points during start-up or low-speed operation. For each sector of rotation of the rotor, two pairs of three-phase vectors are applied, along with current for the corresponding driving phase. The first pair is alternately applied to move the rotor, and the mutual inductances resulting from such application are compared to detect the zero-crossing (ZC) location in the BEMF of the electric motor in that sector. The second pair is then alternately applied within the same sector to continue to move the rotor, and the mutual inductances from such application are compared to detect the commutation point of the electric motor in that sector. The process may be repeated for each successive sector, changing the driving current at each new sector.

公开(公告)号：US20230014063A1

公开(公告)日：2023-01-19

申请号：US17369000

申请日：2021-07-07

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sameer Pradeep Kulkarni ,  Prasad Kulkarni ,  Ganapathi Hegde

IPC: H02P6/28 ,  H02P6/182

Abstract: A motor controller that is operable to control a motor includes drive current generation circuitry having an output coupled to the motor. The motor controller further includes a velocity control path. The velocity control path includes angular velocity estimation circuitry having an input adapted to be coupled to the motor, a velocity comparator having first input coupled to a target velocity input and a second input coupled to an output of the angular velocity estimation circuitry, and an adaptive velocity controller having a first input coupled to an output of the velocity comparator and having an output coupled to a first input of the drive current generation circuitry. The motor controller further includes controller parameter determination circuitry having a first input coupled to the output of the angular velocity estimation circuitry and having an output coupled to a second input of the adaptive velocity controller.

公开(公告)号：US20230006585A1

公开(公告)日：2023-01-05

申请号：US17363571

申请日：2021-06-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Prasad Kulkarni ,  Venkata Pavan Mahankali

IPC: H02P21/18 ,  H02P21/22

Abstract: A motor controller is operable to control a motor. The motor has a first terminal and the motor controller includes an angular velocity transmission path having an input and an output. A current generator includes a velocity-torque input, an angular position input, and a motor drive output. The velocity-torque input is coupled to the output of the angular velocity transmission path. An angular velocity feedback path is coupled between a first terminal and a first location on the angular velocity transmission path. The first location is between the input and the output of the angular velocity transmission path. A current feedback path is coupled between the first terminal and a second location on the angular velocity transmission path. The second location is disposed between the first location on the angular velocity transmission path and the velocity-torque input of the current generator.

公开(公告)号：US20220393631A1

公开(公告)日：2022-12-08

申请号：US17577093

申请日：2022-01-17

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sivabalan Mohan ,  Venkata Pavan Mahankali ,  Prasad Kulkarni ,  Ganapathi Hegde

IPC: H02P27/08 ,  H02P3/18

Abstract: A motor control system operable to control a motor includes a motor control circuit and an inverter circuit connected to the motor control circuit and configured to connect to the motor at phase output terminals. The inverter circuit, in response to one or more output control signals indicating a deceleration instruction from the motor control circuit, implements a multi-state deceleration sequence for at least one commutation state of a commutation scheme of the motor.