公开(公告)号：US11621661B2

公开(公告)日：2023-04-04

申请号：US17384582

申请日：2021-07-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Prasad Kulkarni ,  Venkata Pavan Mahankali ,  Ganapathi Hegde

IPC: H02P21/10 ,  H02P21/22 ,  H02P21/18

Abstract: Described examples include a method that includes setting a reference iq signal in a field-oriented control of a motor such that the field-oriented control modulates power from a power supply using a modulator to apply a torque on the motor that is opposite to a kinetic energy applied to the motor. The method also includes setting a reference id signal in the field-oriented control such that the motor current provided to the power supply is reduced.

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：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：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.

公开(公告)号：US11374521B2

公开(公告)日：2022-06-28

申请号：US16900316

申请日：2020-06-12

Applicant: Texas Instruments Incorporated

Inventor： Venkata Pavan Mahankali ,  Ganapathi Hegde

IPC: H02P21/00 ,  H02P21/18 ,  H02P21/22

Abstract: A system includes: a motor having a stator and a rotor; and a pulse generation circuit coupled to the stator. The system also includes a motor controller coupled to the pulse generation circuit. The motor controller is configured to: determine inductance and resistance values of the motor based on timing parameters obtained during an initial position detection (IPD) interval; determine a rotor position based on the determined inductance and resistance values; and generate control signals for the pulse generation circuit based on the determined rotor position.